* general protection fault in timerqueue_add (2)
@ 2019-01-04 16:36 syzbot
2019-01-04 16:41 ` Dmitry Vyukov
0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2019-01-04 16:36 UTC (permalink / raw)
To: linux-kernel, syzkaller-bugs, tglx
Hello,
syzbot found the following crash on:
HEAD commit: 645ff1e8e704 Merge branch 'for-linus' of git://git.kernel...
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=11a9329f400000
kernel config: https://syzkaller.appspot.com/x/.config?x=20271e14bc1c87f0
dashboard link: https://syzkaller.appspot.com/bug?extid=0bdf4106024c4d67538b
compiler: gcc (GCC) 9.0.0 20181231 (experimental)
Unfortunately, I don't have any reproducer for this crash yet.
IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+0bdf4106024c4d67538b@syzkaller.appspotmail.com
rdma_op 0000000067c360de conn xmit_rdma (null)
kasan: CONFIG_KASAN_INLINE enabled
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 1087 Comm: syz-executor0 Not tainted 4.20.0+ #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:timerqueue_add+0xf2/0x320 lib/timerqueue.c:52
Code: 48 c1 ea 03 42 80 3c 2a 00 0f 85 bc 01 00 00 49 8b 17 48 85 d2 74 3d
48 89 d3 e8 49 19 93 f9 48 8d 7b 18 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00
0f 85 a3 01 00 00 4c 8b 7b 18 4c 89 f7 4c 89 fe e8
RSP: 0018:ffff8880ae607b68 EFLAGS: 00010003
RAX: 000000000000004f RBX: 0000000000000266 RCX: ffffffff87ee7d4c
RDX: 0000000000010000 RSI: ffffffff87ee7d27 RDI: 000000000000027e
RBP: ffff8880ae607b98 R08: ffff888098ad8040 R09: ffffed1015cc5b90
R10: ffffed1015cc5b8f R11: ffff8880ae62dc7b R12: ffff88804ef69618
R13: dffffc0000000000 R14: 000000b853ef7a10 R15: ffff8880a941f468
FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000f31e80 CR3: 000000006792b000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
enqueue_hrtimer+0x1ae/0x570 kernel/time/hrtimer.c:951
__run_hrtimer kernel/time/hrtimer.c:1404 [inline]
__hrtimer_run_queues+0xc39/0x1050 kernel/time/hrtimer.c:1451
hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline]
smp_apic_timer_interrupt+0x18d/0x760 arch/x86/kernel/apic/apic.c:1060
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
</IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:766
[inline]
RIP: 0010:lock_acquire+0x259/0x570 kernel/locking/lockdep.c:3844
Code: 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 64 02 00 00 48 83 3d 26
69 2e 08 00 0f 84 d0 01 00 00 48 8b bd 48 ff ff ff 57 9d <0f> 1f 44 00 00
48 b8 00 00 00 00 00 fc ff df 48 03 85 40 ff ff ff
RSP: 0018:ffff88804bed7598 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff13249e6 RBX: ffff888098ad8040 RCX: 0000000000000000
RDX: dffffc0000000000 RSI: 0000000000000ec1 RDI: 0000000000000286
RBP: ffff88804bed7668 R08: 0000000000000000 R09: ffff888098ad88e0
R10: ffff888098ad88c0 R11: 0000000000000001 R12: ffff888098ad87e0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
task_lock include/linux/sched/task.h:145 [inline]
switch_task_namespaces+0x38/0xd0 kernel/nsproxy.c:223
exit_task_namespaces+0x18/0x20 kernel/nsproxy.c:234
do_exit+0x19d1/0x2650 kernel/exit.c:866
do_group_exit+0x177/0x430 kernel/exit.c:970
get_signal+0x8b4/0x19b0 kernel/signal.c:2517
do_signal+0x91/0x1e80 arch/x86/kernel/signal.c:816
exit_to_usermode_loop+0x2f7/0x3b0 arch/x86/entry/common.c:162
prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
do_syscall_64+0x696/0x800 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457ec9
Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7
48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
ff 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f457f93bc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffa1 RBX: 0000000000000003 RCX: 0000000000457ec9
RDX: 0000000000000000 RSI: 0000000020001600 RDI: 0000000000000006
RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f457f93c6d4
R13: 00000000004c5233 R14: 00000000004d8b00 R15: 00000000ffffffff
Modules linked in:
======================================================
WARNING: possible circular locking dependency detected
4.20.0+ #7 Not tainted
------------------------------------------------------
syz-executor0/1087 is trying to acquire lock:
000000009f70c497 ((console_sem).lock){-.-.}, at: down_trylock+0x13/0x70
kernel/locking/semaphore.c:136
but task is already holding lock:
0000000015bfd133 (hrtimer_bases.lock){-.-.}, at: __run_hrtimer
kernel/time/hrtimer.c:1391 [inline]
0000000015bfd133 (hrtimer_bases.lock){-.-.}, at:
__hrtimer_run_queues+0x40f/0x1050 kernel/time/hrtimer.c:1451
which lock already depends on the new lock.
the existing dependency chain (in reverse order) is:
-> #4 (hrtimer_bases.lock){-.-.}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
lock_hrtimer_base.isra.0+0x75/0x130 kernel/time/hrtimer.c:165
hrtimer_start_range_ns+0x120/0xda0 kernel/time/hrtimer.c:1104
hrtimer_start_expires include/linux/hrtimer.h:409 [inline]
start_rt_bandwidth kernel/sched/rt.c:70 [inline]
inc_rt_group kernel/sched/rt.c:1147 [inline]
inc_rt_tasks kernel/sched/rt.c:1191 [inline]
__enqueue_rt_entity kernel/sched/rt.c:1261 [inline]
enqueue_rt_entity kernel/sched/rt.c:1305 [inline]
enqueue_task_rt+0x95b/0x1010 kernel/sched/rt.c:1335
enqueue_task+0xb9/0x380 kernel/sched/core.c:730
__sched_setscheduler+0xe32/0x1fe0 kernel/sched/core.c:4336
_sched_setscheduler+0x218/0x340 kernel/sched/core.c:4373
sched_setscheduler+0xe/0x10 kernel/sched/core.c:4388
watchdog_dev_init+0x109/0x1db drivers/watchdog/watchdog_dev.c:1144
watchdog_init+0x81/0x294 drivers/watchdog/watchdog_core.c:355
do_one_initcall+0x129/0x937 init/main.c:889
do_initcall_level init/main.c:957 [inline]
do_initcalls init/main.c:965 [inline]
do_basic_setup init/main.c:983 [inline]
kernel_init_freeable+0x4db/0x5ca init/main.c:1136
kernel_init+0x12/0x1c5 init/main.c:1056
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
-> #3 (&rt_b->rt_runtime_lock){-.-.}:
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
__enable_runtime kernel/sched/rt.c:786 [inline]
rq_online_rt+0xb4/0x390 kernel/sched/rt.c:2178
set_rq_online.part.0+0xe7/0x140 kernel/sched/core.c:5666
set_rq_online kernel/sched/core.c:5772 [inline]
sched_cpu_activate+0x29e/0x430 kernel/sched/core.c:5765
cpuhp_invoke_callback+0x2f6/0x2110 kernel/cpu.c:168
cpuhp_thread_fun+0x496/0x8a0 kernel/cpu.c:685
smpboot_thread_fn+0x6ab/0xa10 kernel/smpboot.c:164
kthread+0x357/0x430 kernel/kthread.c:246
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
-> #2 (&rq->lock){-.-.}:
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
rq_lock kernel/sched/sched.h:1149 [inline]
task_fork_fair+0xb5/0x7a0 kernel/sched/fair.c:10058
sched_fork+0x437/0xb90 kernel/sched/core.c:2359
copy_process+0x1ff6/0x8730 kernel/fork.c:1893
_do_fork+0x1a9/0x1170 kernel/fork.c:2222
kernel_thread+0x34/0x40 kernel/fork.c:2281
rest_init+0x28/0x37b init/main.c:409
arch_call_rest_init+0xe/0x1b
start_kernel+0x882/0x8bd init/main.c:741
x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:470
x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:451
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243
-> #1 (&p->pi_lock){-.-.}:
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
try_to_wake_up+0xb9/0x1480 kernel/sched/core.c:1965
wake_up_process+0x10/0x20 kernel/sched/core.c:2129
__up.isra.0+0x1c0/0x2a0 kernel/locking/semaphore.c:262
up+0x13e/0x1c0 kernel/locking/semaphore.c:187
__up_console_sem+0xb7/0x1c0 kernel/printk/printk.c:236
console_unlock+0x778/0x11e0 kernel/printk/printk.c:2426
vprintk_emit+0x370/0x960 kernel/printk/printk.c:1931
vprintk_default+0x28/0x30 kernel/printk/printk.c:1958
vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398
printk+0xba/0xed kernel/printk/printk.c:1991
check_stack_usage kernel/exit.c:755 [inline]
do_exit.cold+0x57/0x16a kernel/exit.c:916
do_group_exit+0x177/0x430 kernel/exit.c:970
__do_sys_exit_group kernel/exit.c:981 [inline]
__se_sys_exit_group kernel/exit.c:979 [inline]
__x64_sys_exit_group+0x44/0x50 kernel/exit.c:979
do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
-> #0 ((console_sem).lock){-.-.}:
lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
down_trylock+0x13/0x70 kernel/locking/semaphore.c:136
__down_trylock_console_sem+0xa8/0x210 kernel/printk/printk.c:219
console_trylock+0x15/0xa0 kernel/printk/printk.c:2242
console_trylock_spinning kernel/printk/printk.c:1662 [inline]
vprintk_emit+0x351/0x960 kernel/printk/printk.c:1930
vprintk_default+0x28/0x30 kernel/printk/printk.c:1958
vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398
printk+0xba/0xed kernel/printk/printk.c:1991
kasan_die_handler arch/x86/mm/kasan_init_64.c:252 [inline]
kasan_die_handler.cold+0x11/0x23 arch/x86/mm/kasan_init_64.c:247
notifier_call_chain+0x179/0x380 kernel/notifier.c:93
__atomic_notifier_call_chain kernel/notifier.c:183 [inline]
atomic_notifier_call_chain+0x96/0x190 kernel/notifier.c:193
notify_die+0x1b2/0x270 kernel/notifier.c:549
do_general_protection+0x13d/0x300 arch/x86/kernel/traps.c:557
general_protection+0x1e/0x30 arch/x86/entry/entry_64.S:1142
timerqueue_add+0xf2/0x320 lib/timerqueue.c:52
enqueue_hrtimer+0x1ae/0x570 kernel/time/hrtimer.c:951
__run_hrtimer kernel/time/hrtimer.c:1404 [inline]
__hrtimer_run_queues+0xc39/0x1050 kernel/time/hrtimer.c:1451
hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline]
smp_apic_timer_interrupt+0x18d/0x760 arch/x86/kernel/apic/apic.c:1060
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
arch_local_irq_restore arch/x86/include/asm/paravirt.h:766 [inline]
lock_acquire+0x259/0x570 kernel/locking/lockdep.c:3844
__raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
spin_lock include/linux/spinlock.h:329 [inline]
task_lock include/linux/sched/task.h:145 [inline]
switch_task_namespaces+0x38/0xd0 kernel/nsproxy.c:223
exit_task_namespaces+0x18/0x20 kernel/nsproxy.c:234
do_exit+0x19d1/0x2650 kernel/exit.c:866
do_group_exit+0x177/0x430 kernel/exit.c:970
get_signal+0x8b4/0x19b0 kernel/signal.c:2517
do_signal+0x91/0x1e80 arch/x86/kernel/signal.c:816
exit_to_usermode_loop+0x2f7/0x3b0 arch/x86/entry/common.c:162
prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
do_syscall_64+0x696/0x800 arch/x86/entry/common.c:293
entry_SYSCALL_64_after_hwframe+0x49/0xbe
other info that might help us debug this:
Chain exists of:
(console_sem).lock --> &rt_b->rt_runtime_lock --> hrtimer_bases.lock
Possible unsafe locking scenario:
CPU0 CPU1
---- ----
lock(hrtimer_bases.lock);
lock(&rt_b->rt_runtime_lock);
lock(hrtimer_bases.lock);
lock((console_sem).lock);
*** DEADLOCK ***
3 locks held by syz-executor0/1087:
#0: 00000000721032d7 (&(&p->alloc_lock)->rlock){+.+.}, at: spin_lock
include/linux/spinlock.h:329 [inline]
#0: 00000000721032d7 (&(&p->alloc_lock)->rlock){+.+.}, at: task_lock
include/linux/sched/task.h:145 [inline]
#0: 00000000721032d7 (&(&p->alloc_lock)->rlock){+.+.}, at:
switch_task_namespaces+0x38/0xd0 kernel/nsproxy.c:223
#1: 0000000015bfd133 (hrtimer_bases.lock){-.-.}, at: __run_hrtimer
kernel/time/hrtimer.c:1391 [inline]
#1: 0000000015bfd133 (hrtimer_bases.lock){-.-.}, at:
__hrtimer_run_queues+0x40f/0x1050 kernel/time/hrtimer.c:1451
#2: 0000000018881b81 (rcu_read_lock){....}, at:
atomic_notifier_call_chain+0x0/0x190 kernel/notifier.c:329
stack backtrace:
CPU: 0 PID: 1087 Comm: syz-executor0 Not tainted 4.20.0+ #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
Call Trace:
<IRQ>
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0x1db/0x2d0 lib/dump_stack.c:113
print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1224
check_prev_add kernel/locking/lockdep.c:1866 [inline]
check_prevs_add kernel/locking/lockdep.c:1979 [inline]
validate_chain kernel/locking/lockdep.c:2350 [inline]
__lock_acquire+0x3014/0x4a30 kernel/locking/lockdep.c:3338
lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
down_trylock+0x13/0x70 kernel/locking/semaphore.c:136
__down_trylock_console_sem+0xa8/0x210 kernel/printk/printk.c:219
console_trylock+0x15/0xa0 kernel/printk/printk.c:2242
console_trylock_spinning kernel/printk/printk.c:1662 [inline]
vprintk_emit+0x351/0x960 kernel/printk/printk.c:1930
vprintk_default+0x28/0x30 kernel/printk/printk.c:1958
vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398
printk+0xba/0xed kernel/printk/printk.c:1991
kasan_die_handler arch/x86/mm/kasan_init_64.c:252 [inline]
kasan_die_handler.cold+0x11/0x23 arch/x86/mm/kasan_init_64.c:247
notifier_call_chain+0x179/0x380 kernel/notifier.c:93
__atomic_notifier_call_chain kernel/notifier.c:183 [inline]
atomic_notifier_call_chain+0x96/0x190 kernel/notifier.c:193
notify_die+0x1b2/0x270 kernel/notifier.c:549
do_general_protection+0x13d/0x300 arch/x86/kernel/traps.c:557
general_protection+0x1e/0x30 arch/x86/entry/entry_64.S:1142
RIP: 0010:timerqueue_add+0xf2/0x320 lib/timerqueue.c:52
Code: 48 c1 ea 03 42 80 3c 2a 00 0f 85 bc 01 00 00 49 8b 17 48 85 d2 74 3d
48 89 d3 e8 49 19 93 f9 48 8d 7b 18 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00
0f 85 a3 01 00 00 4c 8b 7b 18 4c 89 f7 4c 89 fe e8
RSP: 0018:ffff8880ae607b68 EFLAGS: 00010003
RAX: 000000000000004f RBX: 0000000000000266 RCX: ffffffff87ee7d4c
RDX: 0000000000010000 RSI: ffffffff87ee7d27 RDI: 000000000000027e
RBP: ffff8880ae607b98 R08: ffff888098ad8040 R09: ffffed1015cc5b90
R10: ffffed1015cc5b8f R11: ffff8880ae62dc7b R12: ffff88804ef69618
R13: dffffc0000000000 R14: 000000b853ef7a10 R15: ffff8880a941f468
enqueue_hrtimer+0x1ae/0x570 kernel/time/hrtimer.c:951
__run_hrtimer kernel/time/hrtimer.c:1404 [inline]
__hrtimer_run_queues+0xc39/0x1050 kernel/time/hrtimer.c:1451
hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline]
smp_apic_timer_interrupt+0x18d/0x760 arch/x86/kernel/apic/apic.c:1060
apic_timer_in
Lost 71 message(s)!
---[ end trace 8a8a632e11ab3799 ]---
general protection fault: 0000 [#2] PREEMPT SMP KASAN
CPU: 1 PID: 3 Comm: Tainted: G D 4.20.0+ #7
RIP: 0010:timerqueue_add+0xf2/0x320 lib/timerqueue.c:52
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
Google 01/01/2011
RIP: 0010:__read_once_size include/linux/compiler.h:191 [inline]
RIP: 0010:get_running_cputimer include/linux/sched/cputime.h:85 [inline]
RIP: 0010:account_group_system_time include/linux/sched/cputime.h:149
[inline]
RIP: 0010:account_system_index_time+0xe8/0x5f0 kernel/sched/cputime.c:168
Code: 48 c1 ea 03 42 80 3c 2a 00 0f 85 bc 01 00 00 49 8b 17 48 85 d2 74 3d
48 89 d3 e8 49 19 93 f9 48 8d 7b 18 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00
0f 85 a3 01 00 00 4c 8b 7b 18 4c 89 f7 4c 89 fe e8
Code: 04 00 00 49 8b 84 24 00 07 00 00 48 ba 00 00 00 00 00 fc ff df 48 8d
b8 40 01 00 00 48 8d 88 28 01 00 00 48 89 fe 48 c1 ee 03 <0f> b6 14 16 48
89 fe 83 e6 07 40 38 f2 7f 08 84 d2 0f 85 93 03 00
RSP: 0018:ffff8880ae607b68 EFLAGS: 00010003
RSP: 0018:ffff8880ae707a80 EFLAGS: 00010006
RAX: 000000000000004f RBX: 0000000000000266 RCX: ffffffff87ee7d4c
RAX: 0000000041b58ab3 RBX: 1ffff11015ce0f54 RCX: 0000000041b58bdb
RDX: dffffc0000000000 RSI: 000000000836b17e RDI: 0000000041b58bf3
RDX: 0000000000010000 RSI: ffffffff87ee7d27 RDI: 000000000000027e
RBP: ffff8880ae707b48 R08: ffff8880ae71f5f0 R09: fffffbfff1335bc5
R10: fffffbfff1301b45 R11: ffffffff899ade23 R12: ffff8880a94bc440
RBP: ffff8880ae607b98 R08: ffff888098ad8040 R09: ffffed1015cc5b90
R13: 000000000097884e R14: 0000000000000003 R15: ffff8880ae707b20
FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
R10: ffffed1015cc5b8f R11: ffff8880ae62dc7b R12: ffff88804ef69618
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f457f8fad90 CR3: 000000008cfa0000 CR4: 00000000001426e0
R13: dffffc0000000000 R14: 000000b853ef7a10 R15: ffff8880a941f468
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
<IRQ>
CR2: 0000000000f31e80 CR3: 000000006792b000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.
syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#bug-status-tracking for how to communicate with
syzbot.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: general protection fault in timerqueue_add (2)
2019-01-04 16:36 general protection fault in timerqueue_add (2) syzbot
@ 2019-01-04 16:41 ` Dmitry Vyukov
0 siblings, 0 replies; 2+ messages in thread
From: Dmitry Vyukov @ 2019-01-04 16:41 UTC (permalink / raw)
To: syzbot; +Cc: LKML, syzkaller-bugs, Thomas Gleixner, Stefano Brivio
On Fri, Jan 4, 2019 at 5:36 PM syzbot
<syzbot+0bdf4106024c4d67538b@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following crash on:
>
> HEAD commit: 645ff1e8e704 Merge branch 'for-linus' of git://git.kernel...
> git tree: upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=11a9329f400000
> kernel config: https://syzkaller.appspot.com/x/.config?x=20271e14bc1c87f0
> dashboard link: https://syzkaller.appspot.com/bug?extid=0bdf4106024c4d67538b
> compiler: gcc (GCC) 9.0.0 20181231 (experimental)
>
> Unfortunately, I don't have any reproducer for this crash yet.
>
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+0bdf4106024c4d67538b@syzkaller.appspotmail.com
This looks similar to and appeared roughly at the same time as:
KASAN: stack-out-of-bounds Read in timerqueue_add (2)
https://syzkaller.appspot.com/bug?id=668693e5222d4c252d63a6d4c8c4628269adf9d8
That one has one has a repro that looks like the udp stack overflow
bug. So let's consider it the same. This does not look too actionable
on its own.
#syz dup: kernel panic: stack is corrupted in udp4_lib_lookup2
> rdma_op 0000000067c360de conn xmit_rdma (null)
> kasan: CONFIG_KASAN_INLINE enabled
> kasan: CONFIG_KASAN_INLINE enabled
> kasan: GPF could be caused by NULL-ptr deref or user memory access
> kasan: GPF could be caused by NULL-ptr deref or user memory access
> general protection fault: 0000 [#1] PREEMPT SMP KASAN
> CPU: 0 PID: 1087 Comm: syz-executor0 Not tainted 4.20.0+ #7
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> RIP: 0010:timerqueue_add+0xf2/0x320 lib/timerqueue.c:52
> Code: 48 c1 ea 03 42 80 3c 2a 00 0f 85 bc 01 00 00 49 8b 17 48 85 d2 74 3d
> 48 89 d3 e8 49 19 93 f9 48 8d 7b 18 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00
> 0f 85 a3 01 00 00 4c 8b 7b 18 4c 89 f7 4c 89 fe e8
> RSP: 0018:ffff8880ae607b68 EFLAGS: 00010003
> RAX: 000000000000004f RBX: 0000000000000266 RCX: ffffffff87ee7d4c
> RDX: 0000000000010000 RSI: ffffffff87ee7d27 RDI: 000000000000027e
> RBP: ffff8880ae607b98 R08: ffff888098ad8040 R09: ffffed1015cc5b90
> R10: ffffed1015cc5b8f R11: ffff8880ae62dc7b R12: ffff88804ef69618
> R13: dffffc0000000000 R14: 000000b853ef7a10 R15: ffff8880a941f468
> FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 0000000000f31e80 CR3: 000000006792b000 CR4: 00000000001426f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> <IRQ>
> enqueue_hrtimer+0x1ae/0x570 kernel/time/hrtimer.c:951
> __run_hrtimer kernel/time/hrtimer.c:1404 [inline]
> __hrtimer_run_queues+0xc39/0x1050 kernel/time/hrtimer.c:1451
> hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
> local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline]
> smp_apic_timer_interrupt+0x18d/0x760 arch/x86/kernel/apic/apic.c:1060
> apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
> </IRQ>
> RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:766
> [inline]
> RIP: 0010:lock_acquire+0x259/0x570 kernel/locking/lockdep.c:3844
> Code: 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 64 02 00 00 48 83 3d 26
> 69 2e 08 00 0f 84 d0 01 00 00 48 8b bd 48 ff ff ff 57 9d <0f> 1f 44 00 00
> 48 b8 00 00 00 00 00 fc ff df 48 03 85 40 ff ff ff
> RSP: 0018:ffff88804bed7598 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
> RAX: 1ffffffff13249e6 RBX: ffff888098ad8040 RCX: 0000000000000000
> RDX: dffffc0000000000 RSI: 0000000000000ec1 RDI: 0000000000000286
> RBP: ffff88804bed7668 R08: 0000000000000000 R09: ffff888098ad88e0
> R10: ffff888098ad88c0 R11: 0000000000000001 R12: ffff888098ad87e0
> R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
> __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
> _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
> spin_lock include/linux/spinlock.h:329 [inline]
> task_lock include/linux/sched/task.h:145 [inline]
> switch_task_namespaces+0x38/0xd0 kernel/nsproxy.c:223
> exit_task_namespaces+0x18/0x20 kernel/nsproxy.c:234
> do_exit+0x19d1/0x2650 kernel/exit.c:866
> do_group_exit+0x177/0x430 kernel/exit.c:970
> get_signal+0x8b4/0x19b0 kernel/signal.c:2517
> do_signal+0x91/0x1e80 arch/x86/kernel/signal.c:816
> exit_to_usermode_loop+0x2f7/0x3b0 arch/x86/entry/common.c:162
> prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
> syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
> do_syscall_64+0x696/0x800 arch/x86/entry/common.c:293
> entry_SYSCALL_64_after_hwframe+0x49/0xbe
> RIP: 0033:0x457ec9
> Code: 6d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7
> 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff
> ff 0f 83 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
> RSP: 002b:00007f457f93bc78 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
> RAX: ffffffffffffffa1 RBX: 0000000000000003 RCX: 0000000000457ec9
> RDX: 0000000000000000 RSI: 0000000020001600 RDI: 0000000000000006
> RBP: 000000000073bf00 R08: 0000000000000000 R09: 0000000000000000
> R10: 0000000000000000 R11: 0000000000000246 R12: 00007f457f93c6d4
> R13: 00000000004c5233 R14: 00000000004d8b00 R15: 00000000ffffffff
> Modules linked in:
>
> ======================================================
> WARNING: possible circular locking dependency detected
> 4.20.0+ #7 Not tainted
> ------------------------------------------------------
> syz-executor0/1087 is trying to acquire lock:
> 000000009f70c497 ((console_sem).lock){-.-.}, at: down_trylock+0x13/0x70
> kernel/locking/semaphore.c:136
>
> but task is already holding lock:
> 0000000015bfd133 (hrtimer_bases.lock){-.-.}, at: __run_hrtimer
> kernel/time/hrtimer.c:1391 [inline]
> 0000000015bfd133 (hrtimer_bases.lock){-.-.}, at:
> __hrtimer_run_queues+0x40f/0x1050 kernel/time/hrtimer.c:1451
>
> which lock already depends on the new lock.
>
>
> the existing dependency chain (in reverse order) is:
>
> -> #4 (hrtimer_bases.lock){-.-.}:
> __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
> _raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
> lock_hrtimer_base.isra.0+0x75/0x130 kernel/time/hrtimer.c:165
> hrtimer_start_range_ns+0x120/0xda0 kernel/time/hrtimer.c:1104
> hrtimer_start_expires include/linux/hrtimer.h:409 [inline]
> start_rt_bandwidth kernel/sched/rt.c:70 [inline]
> inc_rt_group kernel/sched/rt.c:1147 [inline]
> inc_rt_tasks kernel/sched/rt.c:1191 [inline]
> __enqueue_rt_entity kernel/sched/rt.c:1261 [inline]
> enqueue_rt_entity kernel/sched/rt.c:1305 [inline]
> enqueue_task_rt+0x95b/0x1010 kernel/sched/rt.c:1335
> enqueue_task+0xb9/0x380 kernel/sched/core.c:730
> __sched_setscheduler+0xe32/0x1fe0 kernel/sched/core.c:4336
> _sched_setscheduler+0x218/0x340 kernel/sched/core.c:4373
> sched_setscheduler+0xe/0x10 kernel/sched/core.c:4388
> watchdog_dev_init+0x109/0x1db drivers/watchdog/watchdog_dev.c:1144
> watchdog_init+0x81/0x294 drivers/watchdog/watchdog_core.c:355
> do_one_initcall+0x129/0x937 init/main.c:889
> do_initcall_level init/main.c:957 [inline]
> do_initcalls init/main.c:965 [inline]
> do_basic_setup init/main.c:983 [inline]
> kernel_init_freeable+0x4db/0x5ca init/main.c:1136
> kernel_init+0x12/0x1c5 init/main.c:1056
> ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
>
> -> #3 (&rt_b->rt_runtime_lock){-.-.}:
> __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
> _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
> __enable_runtime kernel/sched/rt.c:786 [inline]
> rq_online_rt+0xb4/0x390 kernel/sched/rt.c:2178
> set_rq_online.part.0+0xe7/0x140 kernel/sched/core.c:5666
> set_rq_online kernel/sched/core.c:5772 [inline]
> sched_cpu_activate+0x29e/0x430 kernel/sched/core.c:5765
> cpuhp_invoke_callback+0x2f6/0x2110 kernel/cpu.c:168
> cpuhp_thread_fun+0x496/0x8a0 kernel/cpu.c:685
> smpboot_thread_fn+0x6ab/0xa10 kernel/smpboot.c:164
> kthread+0x357/0x430 kernel/kthread.c:246
> ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
>
> -> #2 (&rq->lock){-.-.}:
> __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
> _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
> rq_lock kernel/sched/sched.h:1149 [inline]
> task_fork_fair+0xb5/0x7a0 kernel/sched/fair.c:10058
> sched_fork+0x437/0xb90 kernel/sched/core.c:2359
> copy_process+0x1ff6/0x8730 kernel/fork.c:1893
> _do_fork+0x1a9/0x1170 kernel/fork.c:2222
> kernel_thread+0x34/0x40 kernel/fork.c:2281
> rest_init+0x28/0x37b init/main.c:409
> arch_call_rest_init+0xe/0x1b
> start_kernel+0x882/0x8bd init/main.c:741
> x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:470
> x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:451
> secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243
>
> -> #1 (&p->pi_lock){-.-.}:
> __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
> _raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
> try_to_wake_up+0xb9/0x1480 kernel/sched/core.c:1965
> wake_up_process+0x10/0x20 kernel/sched/core.c:2129
> __up.isra.0+0x1c0/0x2a0 kernel/locking/semaphore.c:262
> up+0x13e/0x1c0 kernel/locking/semaphore.c:187
> __up_console_sem+0xb7/0x1c0 kernel/printk/printk.c:236
> console_unlock+0x778/0x11e0 kernel/printk/printk.c:2426
> vprintk_emit+0x370/0x960 kernel/printk/printk.c:1931
> vprintk_default+0x28/0x30 kernel/printk/printk.c:1958
> vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398
> printk+0xba/0xed kernel/printk/printk.c:1991
> check_stack_usage kernel/exit.c:755 [inline]
> do_exit.cold+0x57/0x16a kernel/exit.c:916
> do_group_exit+0x177/0x430 kernel/exit.c:970
> __do_sys_exit_group kernel/exit.c:981 [inline]
> __se_sys_exit_group kernel/exit.c:979 [inline]
> __x64_sys_exit_group+0x44/0x50 kernel/exit.c:979
> do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
> entry_SYSCALL_64_after_hwframe+0x49/0xbe
>
> -> #0 ((console_sem).lock){-.-.}:
> lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841
> __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
> _raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
> down_trylock+0x13/0x70 kernel/locking/semaphore.c:136
> __down_trylock_console_sem+0xa8/0x210 kernel/printk/printk.c:219
> console_trylock+0x15/0xa0 kernel/printk/printk.c:2242
> console_trylock_spinning kernel/printk/printk.c:1662 [inline]
> vprintk_emit+0x351/0x960 kernel/printk/printk.c:1930
> vprintk_default+0x28/0x30 kernel/printk/printk.c:1958
> vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398
> printk+0xba/0xed kernel/printk/printk.c:1991
> kasan_die_handler arch/x86/mm/kasan_init_64.c:252 [inline]
> kasan_die_handler.cold+0x11/0x23 arch/x86/mm/kasan_init_64.c:247
> notifier_call_chain+0x179/0x380 kernel/notifier.c:93
> __atomic_notifier_call_chain kernel/notifier.c:183 [inline]
> atomic_notifier_call_chain+0x96/0x190 kernel/notifier.c:193
> notify_die+0x1b2/0x270 kernel/notifier.c:549
> do_general_protection+0x13d/0x300 arch/x86/kernel/traps.c:557
> general_protection+0x1e/0x30 arch/x86/entry/entry_64.S:1142
> timerqueue_add+0xf2/0x320 lib/timerqueue.c:52
> enqueue_hrtimer+0x1ae/0x570 kernel/time/hrtimer.c:951
> __run_hrtimer kernel/time/hrtimer.c:1404 [inline]
> __hrtimer_run_queues+0xc39/0x1050 kernel/time/hrtimer.c:1451
> hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
> local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline]
> smp_apic_timer_interrupt+0x18d/0x760 arch/x86/kernel/apic/apic.c:1060
> apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
> arch_local_irq_restore arch/x86/include/asm/paravirt.h:766 [inline]
> lock_acquire+0x259/0x570 kernel/locking/lockdep.c:3844
> __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
> _raw_spin_lock+0x2f/0x40 kernel/locking/spinlock.c:144
> spin_lock include/linux/spinlock.h:329 [inline]
> task_lock include/linux/sched/task.h:145 [inline]
> switch_task_namespaces+0x38/0xd0 kernel/nsproxy.c:223
> exit_task_namespaces+0x18/0x20 kernel/nsproxy.c:234
> do_exit+0x19d1/0x2650 kernel/exit.c:866
> do_group_exit+0x177/0x430 kernel/exit.c:970
> get_signal+0x8b4/0x19b0 kernel/signal.c:2517
> do_signal+0x91/0x1e80 arch/x86/kernel/signal.c:816
> exit_to_usermode_loop+0x2f7/0x3b0 arch/x86/entry/common.c:162
> prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
> syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
> do_syscall_64+0x696/0x800 arch/x86/entry/common.c:293
> entry_SYSCALL_64_after_hwframe+0x49/0xbe
>
> other info that might help us debug this:
>
> Chain exists of:
> (console_sem).lock --> &rt_b->rt_runtime_lock --> hrtimer_bases.lock
>
> Possible unsafe locking scenario:
>
> CPU0 CPU1
> ---- ----
> lock(hrtimer_bases.lock);
> lock(&rt_b->rt_runtime_lock);
> lock(hrtimer_bases.lock);
> lock((console_sem).lock);
>
> *** DEADLOCK ***
>
> 3 locks held by syz-executor0/1087:
> #0: 00000000721032d7 (&(&p->alloc_lock)->rlock){+.+.}, at: spin_lock
> include/linux/spinlock.h:329 [inline]
> #0: 00000000721032d7 (&(&p->alloc_lock)->rlock){+.+.}, at: task_lock
> include/linux/sched/task.h:145 [inline]
> #0: 00000000721032d7 (&(&p->alloc_lock)->rlock){+.+.}, at:
> switch_task_namespaces+0x38/0xd0 kernel/nsproxy.c:223
> #1: 0000000015bfd133 (hrtimer_bases.lock){-.-.}, at: __run_hrtimer
> kernel/time/hrtimer.c:1391 [inline]
> #1: 0000000015bfd133 (hrtimer_bases.lock){-.-.}, at:
> __hrtimer_run_queues+0x40f/0x1050 kernel/time/hrtimer.c:1451
> #2: 0000000018881b81 (rcu_read_lock){....}, at:
> atomic_notifier_call_chain+0x0/0x190 kernel/notifier.c:329
>
> stack backtrace:
> CPU: 0 PID: 1087 Comm: syz-executor0 Not tainted 4.20.0+ #7
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> Call Trace:
> <IRQ>
> __dump_stack lib/dump_stack.c:77 [inline]
> dump_stack+0x1db/0x2d0 lib/dump_stack.c:113
> print_circular_bug.isra.0.cold+0x1cc/0x28f kernel/locking/lockdep.c:1224
> check_prev_add kernel/locking/lockdep.c:1866 [inline]
> check_prevs_add kernel/locking/lockdep.c:1979 [inline]
> validate_chain kernel/locking/lockdep.c:2350 [inline]
> __lock_acquire+0x3014/0x4a30 kernel/locking/lockdep.c:3338
> lock_acquire+0x1db/0x570 kernel/locking/lockdep.c:3841
> __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
> _raw_spin_lock_irqsave+0x95/0xcd kernel/locking/spinlock.c:152
> down_trylock+0x13/0x70 kernel/locking/semaphore.c:136
> __down_trylock_console_sem+0xa8/0x210 kernel/printk/printk.c:219
> console_trylock+0x15/0xa0 kernel/printk/printk.c:2242
> console_trylock_spinning kernel/printk/printk.c:1662 [inline]
> vprintk_emit+0x351/0x960 kernel/printk/printk.c:1930
> vprintk_default+0x28/0x30 kernel/printk/printk.c:1958
> vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:398
> printk+0xba/0xed kernel/printk/printk.c:1991
> kasan_die_handler arch/x86/mm/kasan_init_64.c:252 [inline]
> kasan_die_handler.cold+0x11/0x23 arch/x86/mm/kasan_init_64.c:247
> notifier_call_chain+0x179/0x380 kernel/notifier.c:93
> __atomic_notifier_call_chain kernel/notifier.c:183 [inline]
> atomic_notifier_call_chain+0x96/0x190 kernel/notifier.c:193
> notify_die+0x1b2/0x270 kernel/notifier.c:549
> do_general_protection+0x13d/0x300 arch/x86/kernel/traps.c:557
> general_protection+0x1e/0x30 arch/x86/entry/entry_64.S:1142
> RIP: 0010:timerqueue_add+0xf2/0x320 lib/timerqueue.c:52
> Code: 48 c1 ea 03 42 80 3c 2a 00 0f 85 bc 01 00 00 49 8b 17 48 85 d2 74 3d
> 48 89 d3 e8 49 19 93 f9 48 8d 7b 18 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00
> 0f 85 a3 01 00 00 4c 8b 7b 18 4c 89 f7 4c 89 fe e8
> RSP: 0018:ffff8880ae607b68 EFLAGS: 00010003
> RAX: 000000000000004f RBX: 0000000000000266 RCX: ffffffff87ee7d4c
> RDX: 0000000000010000 RSI: ffffffff87ee7d27 RDI: 000000000000027e
> RBP: ffff8880ae607b98 R08: ffff888098ad8040 R09: ffffed1015cc5b90
> R10: ffffed1015cc5b8f R11: ffff8880ae62dc7b R12: ffff88804ef69618
> R13: dffffc0000000000 R14: 000000b853ef7a10 R15: ffff8880a941f468
> enqueue_hrtimer+0x1ae/0x570 kernel/time/hrtimer.c:951
> __run_hrtimer kernel/time/hrtimer.c:1404 [inline]
> __hrtimer_run_queues+0xc39/0x1050 kernel/time/hrtimer.c:1451
> hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
> local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline]
> smp_apic_timer_interrupt+0x18d/0x760 arch/x86/kernel/apic/apic.c:1060
> apic_timer_in
> Lost 71 message(s)!
> ---[ end trace 8a8a632e11ab3799 ]---
> general protection fault: 0000 [#2] PREEMPT SMP KASAN
> CPU: 1 PID: 3 Comm: Tainted: G D 4.20.0+ #7
> RIP: 0010:timerqueue_add+0xf2/0x320 lib/timerqueue.c:52
> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS
> Google 01/01/2011
> RIP: 0010:__read_once_size include/linux/compiler.h:191 [inline]
> RIP: 0010:get_running_cputimer include/linux/sched/cputime.h:85 [inline]
> RIP: 0010:account_group_system_time include/linux/sched/cputime.h:149
> [inline]
> RIP: 0010:account_system_index_time+0xe8/0x5f0 kernel/sched/cputime.c:168
> Code: 48 c1 ea 03 42 80 3c 2a 00 0f 85 bc 01 00 00 49 8b 17 48 85 d2 74 3d
> 48 89 d3 e8 49 19 93 f9 48 8d 7b 18 48 89 f8 48 c1 e8 03 <42> 80 3c 28 00
> 0f 85 a3 01 00 00 4c 8b 7b 18 4c 89 f7 4c 89 fe e8
> Code: 04 00 00 49 8b 84 24 00 07 00 00 48 ba 00 00 00 00 00 fc ff df 48 8d
> b8 40 01 00 00 48 8d 88 28 01 00 00 48 89 fe 48 c1 ee 03 <0f> b6 14 16 48
> 89 fe 83 e6 07 40 38 f2 7f 08 84 d2 0f 85 93 03 00
> RSP: 0018:ffff8880ae607b68 EFLAGS: 00010003
> RSP: 0018:ffff8880ae707a80 EFLAGS: 00010006
> RAX: 000000000000004f RBX: 0000000000000266 RCX: ffffffff87ee7d4c
> RAX: 0000000041b58ab3 RBX: 1ffff11015ce0f54 RCX: 0000000041b58bdb
> RDX: dffffc0000000000 RSI: 000000000836b17e RDI: 0000000041b58bf3
> RDX: 0000000000010000 RSI: ffffffff87ee7d27 RDI: 000000000000027e
> RBP: ffff8880ae707b48 R08: ffff8880ae71f5f0 R09: fffffbfff1335bc5
> R10: fffffbfff1301b45 R11: ffffffff899ade23 R12: ffff8880a94bc440
> RBP: ffff8880ae607b98 R08: ffff888098ad8040 R09: ffffed1015cc5b90
> R13: 000000000097884e R14: 0000000000000003 R15: ffff8880ae707b20
> FS: 0000000000000000(0000) GS:ffff8880ae700000(0000) knlGS:0000000000000000
> R10: ffffed1015cc5b8f R11: ffff8880ae62dc7b R12: ffff88804ef69618
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> CR2: 00007f457f8fad90 CR3: 000000008cfa0000 CR4: 00000000001426e0
> R13: dffffc0000000000 R14: 000000b853ef7a10 R15: ffff8880a941f468
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> FS: 0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
> Call Trace:
> CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> <IRQ>
> CR2: 0000000000f31e80 CR3: 000000006792b000 CR4: 00000000001426f0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
>
>
> ---
> This bug is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@googlegroups.com.
>
> syzbot will keep track of this bug report. See:
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2019-01-04 16:36 general protection fault in timerqueue_add (2) syzbot
2019-01-04 16:41 ` Dmitry Vyukov
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