* [syzbot] [ppp?] possible deadlock in ap_get
@ 2023-08-06 4:19 syzbot
0 siblings, 0 replies; only message in thread
From: syzbot @ 2023-08-06 4:19 UTC (permalink / raw)
To: davem, edumazet, kuba, linux-kernel, linux-ppp, netdev, pabeni,
paulus, syzkaller-bugs
Hello,
syzbot found the following issue on:
HEAD commit: f6a691685962 Merge tag '6.5-rc4-smb3-client-fix' of git://..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=155b4093a80000
kernel config: https://syzkaller.appspot.com/x/.config?x=fa5bd4cd5ab6259d
dashboard link: https://syzkaller.appspot.com/bug?extid=cb575960cbf993938435
compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/402b1d665760/disk-f6a69168.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/e18b9495da50/vmlinux-f6a69168.xz
kernel image: https://storage.googleapis.com/syzbot-assets/0a8d1f7341ec/bzImage-f6a69168.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+cb575960cbf993938435@syzkaller.appspotmail.com
========================================================
WARNING: possible irq lock inversion dependency detected
6.5.0-rc4-syzkaller-00245-gf6a691685962 #0 Not tainted
--------------------------------------------------------
syz-executor.3/5705 just changed the state of lock:
ffffffff8d9463f8 (disc_data_lock){.?.-}-{2:2}, at: ap_get+0x18/0xf0 drivers/net/ppp/ppp_async.c:136
but this lock was taken by another, HARDIRQ-safe lock in the past:
(&port_lock_key){-.-.}-{2:2}
and interrupts could create inverse lock ordering between them.
other info that might help us debug this:
Possible interrupt unsafe locking scenario:
CPU0 CPU1
---- ----
lock(disc_data_lock);
local_irq_disable();
lock(&port_lock_key);
lock(disc_data_lock);
<Interrupt>
lock(&port_lock_key);
*** DEADLOCK ***
1 lock held by syz-executor.3/5705:
#0: ffff888079948098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
the shortest dependencies between 2nd lock and 1st lock:
-> (&port_lock_key){-.-.}-{2:2} {
IN-HARDIRQ-W at:
lock_acquire kernel/locking/lockdep.c:5761 [inline]
lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5726
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x50 kernel/locking/spinlock.c:162
serial8250_handle_irq+0x91/0xbe0 drivers/tty/serial/8250/8250_port.c:1917
serial8250_default_handle_irq+0x94/0x210 drivers/tty/serial/8250/8250_port.c:1963
serial8250_interrupt+0xfc/0x200 drivers/tty/serial/8250/8250_core.c:127
__handle_irq_event_percpu+0x22a/0x740 kernel/irq/handle.c:158
handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:210
handle_edge_irq+0x261/0xcf0 kernel/irq/chip.c:834
generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
handle_irq arch/x86/kernel/irq.c:238 [inline]
__common_interrupt+0x9f/0x220 arch/x86/kernel/irq.c:257
common_interrupt+0xa9/0xd0 arch/x86/kernel/irq.c:247
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636
native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
arch_safe_halt arch/x86/include/asm/irqflags.h:86 [inline]
acpi_safe_halt+0x1b/0x20 drivers/acpi/processor_idle.c:112
acpi_idle_enter+0xc5/0x160 drivers/acpi/processor_idle.c:707
cpuidle_enter_state+0x82/0x500 drivers/cpuidle/cpuidle.c:267
cpuidle_enter+0x4e/0xa0 drivers/cpuidle/cpuidle.c:388
cpuidle_idle_call kernel/sched/idle.c:215 [inline]
do_idle+0x315/0x3f0 kernel/sched/idle.c:282
cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:379
rest_init+0x16f/0x2b0 init/main.c:726
arch_call_rest_init+0x13/0x30 init/main.c:823
start_kernel+0x39f/0x480 init/main.c:1068
x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:556
x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:537
secondary_startup_64_no_verify+0x167/0x16b
IN-SOFTIRQ-W at:
lock_acquire kernel/locking/lockdep.c:5761 [inline]
lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5726
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x50 kernel/locking/spinlock.c:162
serial8250_handle_irq+0x91/0xbe0 drivers/tty/serial/8250/8250_port.c:1917
serial8250_default_handle_irq+0x94/0x210 drivers/tty/serial/8250/8250_port.c:1963
serial8250_interrupt+0xfc/0x200 drivers/tty/serial/8250/8250_core.c:127
__handle_irq_event_percpu+0x22a/0x740 kernel/irq/handle.c:158
handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:210
handle_edge_irq+0x261/0xcf0 kernel/irq/chip.c:834
generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
handle_irq arch/x86/kernel/irq.c:238 [inline]
__common_interrupt+0x9f/0x220 arch/x86/kernel/irq.c:257
common_interrupt+0x51/0xd0 arch/x86/kernel/irq.c:247
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636
variable_ffs arch/x86/include/asm/bitops.h:319 [inline]
__do_softirq+0x1dd/0x965 kernel/softirq.c:541
invoke_softirq kernel/softirq.c:427 [inline]
__irq_exit_rcu kernel/softirq.c:632 [inline]
irq_exit_rcu+0xb7/0x120 kernel/softirq.c:644
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1109
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
arch_atomic_read arch/x86/include/asm/atomic.h:23 [inline]
raw_atomic_read include/linux/atomic/atomic-arch-fallback.h:444 [inline]
rcu_dynticks_curr_cpu_in_eqs include/linux/context_tracking.h:122 [inline]
rcu_is_watching+0x5c/0xb0 kernel/rcu/tree.c:695
rcu_read_lock_held_common kernel/rcu/update.c:108 [inline]
rcu_read_lock_held+0x1a/0x40 kernel/rcu/update.c:348
xa_entry include/linux/xarray.h:1198 [inline]
xas_descend+0x2ba/0x480 lib/xarray.c:206
xas_load+0xe0/0x140 lib/xarray.c:244
xas_find+0x60b/0x870 lib/xarray.c:1250
first_map_page mm/filemap.c:3482 [inline]
filemap_map_pages+0x1f8/0x1150 mm/filemap.c:3509
do_fault_around mm/memory.c:4510 [inline]
do_read_fault mm/memory.c:4542 [inline]
do_fault mm/memory.c:4670 [inline]
do_pte_missing mm/memory.c:3664 [inline]
handle_pte_fault mm/memory.c:4939 [inline]
__handle_mm_fault+0x2784/0x3b80 mm/memory.c:5079
handle_mm_fault+0x2ab/0x9d0 mm/memory.c:5233
do_user_addr_fault+0x446/0xfc0 arch/x86/mm/fault.c:1392
handle_page_fault arch/x86/mm/fault.c:1486 [inline]
exc_page_fault+0x5c/0xd0 arch/x86/mm/fault.c:1542
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
INITIAL USE at:
lock_acquire kernel/locking/lockdep.c:5761 [inline]
lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5726
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x50 kernel/locking/spinlock.c:162
serial8250_do_set_termios+0x334/0x1240 drivers/tty/serial/8250/8250_port.c:2794
serial8250_set_termios+0x6b/0x80 drivers/tty/serial/8250/8250_port.c:2913
uart_set_options+0x30e/0x5e0 drivers/tty/serial/serial_core.c:2284
serial8250_console_setup+0x18a/0x430 drivers/tty/serial/8250/8250_port.c:3507
univ8250_console_setup+0x168/0x210 drivers/tty/serial/8250/8250_core.c:631
try_enable_preferred_console+0x24d/0x470 kernel/printk/printk.c:3228
register_console+0x331/0x10d0 kernel/printk/printk.c:3401
univ8250_console_init+0x35/0x50 drivers/tty/serial/8250/8250_core.c:716
console_init+0xba/0x5c0 kernel/printk/printk.c:3601
start_kernel+0x25a/0x480 init/main.c:1004
x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:556
x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:537
secondary_startup_64_no_verify+0x167/0x16b
}
... key at: [<ffffffff92407120>] port_lock_key+0x0/0x40
... acquired at:
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x3a/0x70 kernel/locking/spinlock.c:228
ap_get+0x18/0xf0 drivers/net/ppp/ppp_async.c:136
ppp_asynctty_wakeup+0x18/0xb0 drivers/net/ppp/ppp_async.c:360
tty_wakeup+0xe5/0x120 drivers/tty/tty_io.c:525
tty_port_default_wakeup+0x2a/0x40 drivers/tty/tty_port.c:71
serial8250_tx_chars+0x542/0xf60 drivers/tty/serial/8250/8250_port.c:1839
serial8250_handle_irq+0x5fb/0xbe0 drivers/tty/serial/8250/8250_port.c:1943
serial8250_default_handle_irq+0x94/0x210 drivers/tty/serial/8250/8250_port.c:1963
serial8250_interrupt+0xfc/0x200 drivers/tty/serial/8250/8250_core.c:127
__handle_irq_event_percpu+0x22a/0x740 kernel/irq/handle.c:158
handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:210
handle_edge_irq+0x261/0xcf0 kernel/irq/chip.c:834
generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
handle_irq arch/x86/kernel/irq.c:238 [inline]
__common_interrupt+0x9f/0x220 arch/x86/kernel/irq.c:257
common_interrupt+0xa9/0xd0 arch/x86/kernel/irq.c:247
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
_raw_spin_unlock_irqrestore+0x31/0x70 kernel/locking/spinlock.c:194
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
serial_port_runtime_resume+0x2ae/0x330 drivers/tty/serial/serial_port.c:41
__rpm_callback+0xc5/0x4c0 drivers/base/power/runtime.c:392
rpm_callback+0x1da/0x220 drivers/base/power/runtime.c:446
rpm_resume+0xdb9/0x1980 drivers/base/power/runtime.c:912
pm_runtime_work+0x12e/0x180 drivers/base/power/runtime.c:977
process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2597
worker_thread+0x687/0x1110 kernel/workqueue.c:2748
kthread+0x33a/0x430 kernel/kthread.c:389
ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
-> (disc_data_lock){.?.-}-{2:2} {
IN-HARDIRQ-R at:
lock_acquire kernel/locking/lockdep.c:5761 [inline]
lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5726
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x3a/0x70 kernel/locking/spinlock.c:228
ap_get+0x18/0xf0 drivers/net/ppp/ppp_async.c:136
ppp_asynctty_wakeup+0x18/0xb0 drivers/net/ppp/ppp_async.c:360
tty_wakeup+0xe5/0x120 drivers/tty/tty_io.c:525
tty_port_default_wakeup+0x2a/0x40 drivers/tty/tty_port.c:71
serial8250_tx_chars+0x542/0xf60 drivers/tty/serial/8250/8250_port.c:1839
serial8250_handle_irq+0x5fb/0xbe0 drivers/tty/serial/8250/8250_port.c:1943
serial8250_default_handle_irq+0x94/0x210 drivers/tty/serial/8250/8250_port.c:1963
serial8250_interrupt+0xfc/0x200 drivers/tty/serial/8250/8250_core.c:127
__handle_irq_event_percpu+0x22a/0x740 kernel/irq/handle.c:158
handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:210
handle_edge_irq+0x261/0xcf0 kernel/irq/chip.c:834
generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
handle_irq arch/x86/kernel/irq.c:238 [inline]
__common_interrupt+0x9f/0x220 arch/x86/kernel/irq.c:257
common_interrupt+0xa9/0xd0 arch/x86/kernel/irq.c:247
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
_raw_spin_unlock_irqrestore+0x31/0x70 kernel/locking/spinlock.c:194
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
serial_port_runtime_resume+0x2ae/0x330 drivers/tty/serial/serial_port.c:41
__rpm_callback+0xc5/0x4c0 drivers/base/power/runtime.c:392
rpm_callback+0x1da/0x220 drivers/base/power/runtime.c:446
rpm_resume+0xdb9/0x1980 drivers/base/power/runtime.c:912
pm_runtime_work+0x12e/0x180 drivers/base/power/runtime.c:977
process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2597
worker_thread+0x687/0x1110 kernel/workqueue.c:2748
kthread+0x33a/0x430 kernel/kthread.c:389
ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
HARDIRQ-ON-R at:
lock_acquire kernel/locking/lockdep.c:5761 [inline]
lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5726
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228
ap_get+0x18/0xf0 drivers/net/ppp/ppp_async.c:136
ppp_asynctty_ioctl+0x23/0x2c0 drivers/net/ppp/ppp_async.c:286
tty_ioctl+0x706/0x1580 drivers/tty/tty_io.c:2795
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
IN-SOFTIRQ-R at:
lock_acquire kernel/locking/lockdep.c:5761 [inline]
lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5726
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x3a/0x70 kernel/locking/spinlock.c:228
ap_get+0x18/0xf0 drivers/net/ppp/ppp_async.c:136
ppp_asynctty_wakeup+0x18/0xb0 drivers/net/ppp/ppp_async.c:360
tty_wakeup+0xe5/0x120 drivers/tty/tty_io.c:525
tty_port_default_wakeup+0x2a/0x40 drivers/tty/tty_port.c:71
serial8250_tx_chars+0x542/0xf60 drivers/tty/serial/8250/8250_port.c:1839
serial8250_handle_irq+0x5fb/0xbe0 drivers/tty/serial/8250/8250_port.c:1943
serial8250_default_handle_irq+0x94/0x210 drivers/tty/serial/8250/8250_port.c:1963
serial8250_interrupt+0xfc/0x200 drivers/tty/serial/8250/8250_core.c:127
__handle_irq_event_percpu+0x22a/0x740 kernel/irq/handle.c:158
handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:210
handle_edge_irq+0x261/0xcf0 kernel/irq/chip.c:834
generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
handle_irq arch/x86/kernel/irq.c:238 [inline]
__common_interrupt+0x9f/0x220 arch/x86/kernel/irq.c:257
common_interrupt+0x51/0xd0 arch/x86/kernel/irq.c:247
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636
variable_ffs arch/x86/include/asm/bitops.h:319 [inline]
__do_softirq+0x1dd/0x965 kernel/softirq.c:541
invoke_softirq kernel/softirq.c:427 [inline]
__irq_exit_rcu kernel/softirq.c:632 [inline]
irq_exit_rcu+0xb7/0x120 kernel/softirq.c:644
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1109
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:645
synchronize_rcu+0x0/0x3b0 kernel/rcu/tree_exp.h:285
lockdep_unregister_key+0x29a/0x490 kernel/locking/lockdep.c:6482
wq_unregister_lockdep kernel/workqueue.c:3812 [inline]
pwq_unbound_release_workfn+0x255/0x330 kernel/workqueue.c:4060
process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2597
worker_thread+0x687/0x1110 kernel/workqueue.c:2748
kthread+0x33a/0x430 kernel/kthread.c:389
ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
INITIAL USE at:
lock_acquire kernel/locking/lockdep.c:5761 [inline]
lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5726
__raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
_raw_write_lock_irq+0x36/0x50 kernel/locking/spinlock.c:326
ppp_asynctty_close+0x1c/0x1c0 drivers/net/ppp/ppp_async.c:219
tty_ldisc_close+0x111/0x190 drivers/tty/tty_ldisc.c:455
tty_ldisc_kill+0x94/0x150 drivers/tty/tty_ldisc.c:607
tty_ldisc_release+0x17b/0x2a0 drivers/tty/tty_ldisc.c:775
tty_release_struct+0x23/0xe0 drivers/tty/tty_io.c:1698
tty_release+0xe23/0x1410 drivers/tty/tty_io.c:1869
__fput+0x3fd/0xac0 fs/file_table.c:384
task_work_run+0x14d/0x240 kernel/task_work.c:179
get_signal+0x1075/0x2770 kernel/signal.c:2657
arch_do_signal_or_restart+0x89/0x5f0 arch/x86/kernel/signal.c:308
exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297
do_syscall_64+0x44/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd
INITIAL READ USE at:
lock_acquire kernel/locking/lockdep.c:5761 [inline]
lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5726
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x3a/0x70 kernel/locking/spinlock.c:228
ap_get+0x18/0xf0 drivers/net/ppp/ppp_async.c:136
ppp_asynctty_wakeup+0x18/0xb0 drivers/net/ppp/ppp_async.c:360
tty_wakeup+0xe5/0x120 drivers/tty/tty_io.c:525
tty_port_default_wakeup+0x2a/0x40 drivers/tty/tty_port.c:71
serial8250_tx_chars+0x542/0xf60 drivers/tty/serial/8250/8250_port.c:1839
serial8250_handle_irq+0x5fb/0xbe0 drivers/tty/serial/8250/8250_port.c:1943
serial8250_default_handle_irq+0x94/0x210 drivers/tty/serial/8250/8250_port.c:1963
serial8250_interrupt+0xfc/0x200 drivers/tty/serial/8250/8250_core.c:127
__handle_irq_event_percpu+0x22a/0x740 kernel/irq/handle.c:158
handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:210
handle_edge_irq+0x261/0xcf0 kernel/irq/chip.c:834
generic_handle_irq_desc include/linux/irqdesc.h:161 [inline]
handle_irq arch/x86/kernel/irq.c:238 [inline]
__common_interrupt+0x9f/0x220 arch/x86/kernel/irq.c:257
common_interrupt+0xa9/0xd0 arch/x86/kernel/irq.c:247
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636
__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
_raw_spin_unlock_irqrestore+0x31/0x70 kernel/locking/spinlock.c:194
spin_unlock_irqrestore include/linux/spinlock.h:406 [inline]
serial_port_runtime_resume+0x2ae/0x330 drivers/tty/serial/serial_port.c:41
__rpm_callback+0xc5/0x4c0 drivers/base/power/runtime.c:392
rpm_callback+0x1da/0x220 drivers/base/power/runtime.c:446
rpm_resume+0xdb9/0x1980 drivers/base/power/runtime.c:912
pm_runtime_work+0x12e/0x180 drivers/base/power/runtime.c:977
process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2597
worker_thread+0x687/0x1110 kernel/workqueue.c:2748
kthread+0x33a/0x430 kernel/kthread.c:389
ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
}
... key at: [<ffffffff8d9463f8>] disc_data_lock+0x18/0x60
... acquired at:
mark_usage kernel/locking/lockdep.c:4586 [inline]
__lock_acquire+0x13a5/0x5de0 kernel/locking/lockdep.c:5098
lock_acquire kernel/locking/lockdep.c:5761 [inline]
lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5726
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228
ap_get+0x18/0xf0 drivers/net/ppp/ppp_async.c:136
ppp_asynctty_ioctl+0x23/0x2c0 drivers/net/ppp/ppp_async.c:286
tty_ioctl+0x706/0x1580 drivers/tty/tty_io.c:2795
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
stack backtrace:
CPU: 1 PID: 5705 Comm: syz-executor.3 Not tainted 6.5.0-rc4-syzkaller-00245-gf6a691685962 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
print_irq_inversion_bug.part.0+0x3e1/0x590 kernel/locking/lockdep.c:4087
print_irq_inversion_bug kernel/locking/lockdep.c:4040 [inline]
check_usage_forwards kernel/locking/lockdep.c:4118 [inline]
mark_lock_irq kernel/locking/lockdep.c:4250 [inline]
mark_lock+0x920/0x1950 kernel/locking/lockdep.c:4685
mark_usage kernel/locking/lockdep.c:4586 [inline]
__lock_acquire+0x13a5/0x5de0 kernel/locking/lockdep.c:5098
lock_acquire kernel/locking/lockdep.c:5761 [inline]
lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5726
__raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
_raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228
ap_get+0x18/0xf0 drivers/net/ppp/ppp_async.c:136
ppp_asynctty_ioctl+0x23/0x2c0 drivers/net/ppp/ppp_async.c:286
tty_ioctl+0x706/0x1580 drivers/tty/tty_io.c:2795
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl fs/ioctl.c:856 [inline]
__x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:856
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fbb1967cae9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 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 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbb1a4710c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fbb1979c050 RCX: 00007fbb1967cae9
RDX: 00000000200001c0 RSI: 0000000040045431 RDI: 0000000000000003
RBP: 00007fbb196c847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007fbb1979c050 R15: 00007fbb198bfa48
</TASK>
---
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2023-08-06 4:19 [syzbot] [ppp?] possible deadlock in ap_get syzbot
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