[syzbot] possible deadlock in snd_timer_interrupt

* [syzbot] possible deadlock in snd_timer_interrupt
@ 2021-07-25 12:39 syzbot
  2021-07-25 13:19 ` Desmond Cheong Zhi Xi
  0 siblings, 1 reply; 2+ messages in thread
From: syzbot @ 2021-07-25 12:39 UTC (permalink / raw)
  To: allen.lkml, alsa-devel, boqun.feng, broonie, joe, linux-kernel,
	mingo, perex, peterz, pierre-louis.bossart, syzkaller-bugs,
	tiwai, will

Hello,

syzbot found the following issue on:

HEAD commit:    f0fddcec6b62 Merge tag 'for-5.14-rc2-tag' of git://git.ker..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13cbb70e300000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5dc0e3202ae2f574
dashboard link: https://syzkaller.appspot.com/bug?extid=17c16b868e6af41acdd4
compiler:       Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.1
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17667ecc300000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=179e0582300000

The issue was bisected to:

commit e918188611f073063415f40fae568fa4d86d9044
Author: Boqun Feng <boqun.feng@gmail.com>
Date:   Fri Aug 7 07:42:20 2020 +0000

    locking: More accurate annotations for read_lock()

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=109610b2300000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=129610b2300000
console output: https://syzkaller.appspot.com/x/log.txt?x=149610b2300000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+17c16b868e6af41acdd4@syzkaller.appspotmail.com
Fixes: e918188611f0 ("locking: More accurate annotations for read_lock()")

========================================================
WARNING: possible irq lock inversion dependency detected
5.14.0-rc2-syzkaller #0 Not tainted
--------------------------------------------------------
syz-executor065/8431 just changed the state of lock:
ffff888027e94148 (&timer->lock){..-.}-{2:2}, at: snd_timer_interrupt+0x210/0x1410 sound/core/timer.c:857
but this lock took another, SOFTIRQ-READ-unsafe lock in the past:
 (&f->f_owner.lock){.+.+}-{2:2}

and interrupts could create inverse lock ordering between them.

other info that might help us debug this:
Chain exists of:
  &timer->lock --> &new->fa_lock --> &f->f_owner.lock

 Possible interrupt unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&f->f_owner.lock);
                               local_irq_disable();
                               lock(&timer->lock);
                               lock(&new->fa_lock);
  <Interrupt>
    lock(&timer->lock);

 *** DEADLOCK ***

4 locks held by syz-executor065/8431:
 #0: ffff888029390460 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:375
 #1: ffff888039f60e80 (&type->i_mutex_dir_key#4/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:809 [inline]
 #1: ffff888039f60e80 (&type->i_mutex_dir_key#4/1){+.+.}-{3:3}, at: filename_create+0x19f/0x700 fs/namei.c:3602
 #2: ffffffff8c7177c0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:266
 #3: ffffc90000dc0be0 ((&priv->tlist)){+.-.}-{0:0}, at: lockdep_copy_map include/linux/lockdep.h:45 [inline]
 #3: ffffc90000dc0be0 ((&priv->tlist)){+.-.}-{0:0}, at: call_timer_fn+0xbd/0x210 kernel/time/timer.c:1407

the shortest dependencies between 2nd lock and 1st lock:
  -> (&f->f_owner.lock){.+.+}-{2:2} {
     HARDIRQ-ON-R at:
                        lock_acquire+0x182/0x4a0 kernel/locking/lockdep.c:5625
                        __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
                        _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:223
                        f_getown_ex fs/fcntl.c:211 [inline]
                        do_fcntl+0x150/0x1510 fs/fcntl.c:395
                        __do_sys_fcntl fs/fcntl.c:471 [inline]
                        __se_sys_fcntl+0xd8/0x1b0 fs/fcntl.c:456
                        do_syscall_x64 arch/x86/entry/common.c:50 [inline]
                        do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
                        entry_SYSCALL_64_after_hwframe+0x44/0xae
     SOFTIRQ-ON-R at:
                        lock_acquire+0x182/0x4a0 kernel/locking/lockdep.c:5625
                        __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
                        _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:223
                        f_getown_ex fs/fcntl.c:211 [inline]
                        do_fcntl+0x150/0x1510 fs/fcntl.c:395
                        __do_sys_fcntl fs/fcntl.c:471 [inline]
                        __se_sys_fcntl+0xd8/0x1b0 fs/fcntl.c:456
                        do_syscall_x64 arch/x86/entry/common.c:50 [inline]
                        do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
                        entry_SYSCALL_64_after_hwframe+0x44/0xae
     INITIAL READ USE at:
                            lock_acquire+0x182/0x4a0 kernel/locking/lockdep.c:5625
                            __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
                            _raw_read_lock_irqsave+0xbb/0x100 kernel/locking/spinlock.c:231
                            send_sigio+0x2f/0x300 fs/fcntl.c:795
                            kill_fasync_rcu fs/fcntl.c:1019 [inline]
                            kill_fasync+0x1e3/0x430 fs/fcntl.c:1033
                            snd_timer_user_ccallback+0x3ee/0x710 sound/core/timer.c:1387
                            snd_timer_notify1+0x19e/0x340 sound/core/timer.c:516
                            snd_timer_start1+0x53d/0x640 sound/core/timer.c:578
                            snd_timer_start sound/core/timer.c:697 [inline]
                            snd_timer_user_start sound/core/timer.c:1985 [inline]
                            __snd_timer_user_ioctl+0xe18/0x5ed0 sound/core/timer.c:2108
                            snd_timer_user_ioctl+0x5d/0x80 sound/core/timer.c:2129
                            vfs_ioctl fs/ioctl.c:51 [inline]
                            __do_sys_ioctl fs/ioctl.c:1069 [inline]
                            __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:1055
                            do_syscall_x64 arch/x86/entry/common.c:50 [inline]
                            do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
                            entry_SYSCALL_64_after_hwframe+0x44/0xae
   }
   ... key      at: [<ffffffff907d04a0>] __alloc_file.__key+0x0/0x10
   ... acquired at:
   lock_acquire+0x182/0x4a0 kernel/locking/lockdep.c:5625
   __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
   _raw_read_lock_irqsave+0xbb/0x100 kernel/locking/spinlock.c:231
   send_sigio+0x2f/0x300 fs/fcntl.c:795
   kill_fasync_rcu fs/fcntl.c:1019 [inline]
   kill_fasync+0x1e3/0x430 fs/fcntl.c:1033
   snd_timer_user_ccallback+0x3ee/0x710 sound/core/timer.c:1387
   snd_timer_notify1+0x19e/0x340 sound/core/timer.c:516
   snd_timer_start1+0x53d/0x640 sound/core/timer.c:578
   snd_timer_start sound/core/timer.c:697 [inline]
   snd_timer_user_start sound/core/timer.c:1985 [inline]
   __snd_timer_user_ioctl+0xe18/0x5ed0 sound/core/timer.c:2108
   snd_timer_user_ioctl+0x5d/0x80 sound/core/timer.c:2129
   vfs_ioctl fs/ioctl.c:51 [inline]
   __do_sys_ioctl fs/ioctl.c:1069 [inline]
   __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:1055
   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
   do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
   entry_SYSCALL_64_after_hwframe+0x44/0xae

 -> (&new->fa_lock){....}-{2:2} {
    INITIAL USE at:
                     lock_acquire+0x182/0x4a0 kernel/locking/lockdep.c:5625
                     __raw_write_lock_irq include/linux/rwlock_api_smp.h:196 [inline]
                     _raw_write_lock_irq+0xae/0xf0 kernel/locking/spinlock.c:311
                     fasync_remove_entry+0xff/0x1d0 fs/fcntl.c:890
                     __fput+0x65b/0x7b0 fs/file_table.c:277
                     task_work_run+0x146/0x1c0 kernel/task_work.c:164
                     exit_task_work include/linux/task_work.h:32 [inline]
                     do_exit+0x72b/0x2510 kernel/exit.c:825
                     do_group_exit+0x168/0x2d0 kernel/exit.c:922
                     get_signal+0x16b0/0x2080 kernel/signal.c:2808
                     arch_do_signal_or_restart+0x8e/0x6d0 arch/x86/kernel/signal.c:865
                     handle_signal_work kernel/entry/common.c:148 [inline]
                     exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
                     exit_to_user_mode_prepare+0x191/0x220 kernel/entry/common.c:209
                     __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
                     syscall_exit_to_user_mode+0x26/0x60 kernel/entry/common.c:302
                     do_syscall_64+0x4c/0xb0 arch/x86/entry/common.c:86
                     entry_SYSCALL_64_after_hwframe+0x44/0xae
    INITIAL READ USE at:
                          lock_acquire+0x182/0x4a0 kernel/locking/lockdep.c:5625
                          __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
                          _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:223
                          kill_fasync_rcu fs/fcntl.c:1012 [inline]
                          kill_fasync+0x13b/0x430 fs/fcntl.c:1033
                          snd_timer_user_ccallback+0x3ee/0x710 sound/core/timer.c:1387
                          snd_timer_notify1+0x19e/0x340 sound/core/timer.c:516
                          snd_timer_start1+0x53d/0x640 sound/core/timer.c:578
                          snd_timer_start sound/core/timer.c:697 [inline]
                          snd_timer_user_start sound/core/timer.c:1985 [inline]
                          __snd_timer_user_ioctl+0xe18/0x5ed0 sound/core/timer.c:2108
                          snd_timer_user_ioctl+0x5d/0x80 sound/core/timer.c:2129
                          vfs_ioctl fs/ioctl.c:51 [inline]
                          __do_sys_ioctl fs/ioctl.c:1069 [inline]
                          __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:1055
                          do_syscall_x64 arch/x86/entry/common.c:50 [inline]
                          do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
                          entry_SYSCALL_64_after_hwframe+0x44/0xae
  }
  ... key      at: [<ffffffff907d1360>] fasync_insert_entry.__key+0x0/0x40
  ... acquired at:
   lock_acquire+0x182/0x4a0 kernel/locking/lockdep.c:5625
   __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
   _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:223
   kill_fasync_rcu fs/fcntl.c:1012 [inline]
   kill_fasync+0x13b/0x430 fs/fcntl.c:1033
   snd_timer_user_ccallback+0x3ee/0x710 sound/core/timer.c:1387
   snd_timer_notify1+0x19e/0x340 sound/core/timer.c:516
   snd_timer_start1+0x53d/0x640 sound/core/timer.c:578
   snd_timer_start sound/core/timer.c:697 [inline]
   snd_timer_user_start sound/core/timer.c:1985 [inline]
   __snd_timer_user_ioctl+0xe18/0x5ed0 sound/core/timer.c:2108
   snd_timer_user_ioctl+0x5d/0x80 sound/core/timer.c:2129
   vfs_ioctl fs/ioctl.c:51 [inline]
   __do_sys_ioctl fs/ioctl.c:1069 [inline]
   __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:1055
   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
   do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
   entry_SYSCALL_64_after_hwframe+0x44/0xae

-> (&timer->lock){..-.}-{2:2} {
   IN-SOFTIRQ-W at:
                    lock_acquire+0x182/0x4a0 kernel/locking/lockdep.c:5625
                    __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
                    _raw_spin_lock_irqsave+0xb3/0x100 kernel/locking/spinlock.c:159
                    snd_timer_interrupt+0x210/0x1410 sound/core/timer.c:857
                    call_timer_fn+0xf6/0x210 kernel/time/timer.c:1417
                    expire_timers kernel/time/timer.c:1462 [inline]
                    __run_timers+0x6ff/0x910 kernel/time/timer.c:1731
                    run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1744
                    __do_softirq+0x372/0x783 kernel/softirq.c:558
                    invoke_softirq kernel/softirq.c:432 [inline]
                    __irq_exit_rcu+0x21b/0x260 kernel/softirq.c:636
                    irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
                    sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1100
                    asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
                    __preempt_count_add arch/x86/include/asm/preempt.h:80 [inline]
                    rcu_is_watching+0xd/0xb0 kernel/rcu/tree.c:1159
                    rcu_read_lock include/linux/rcupdate.h:688 [inline]
                    get_cached_acl+0x103/0x540 fs/posix_acl.c:44
                    get_acl+0x20/0x2e0 fs/posix_acl.c:108
                    posix_acl_create+0x119/0x560 fs/posix_acl.c:616
                    ext4_init_acl+0xa6/0x3d0 fs/ext4/acl.c:282
                    __ext4_new_inode+0x44e7/0x5810 fs/ext4/ialloc.c:1316
                    ext4_mkdir+0x3fa/0xc10 fs/ext4/namei.c:2921
                    vfs_mkdir+0x451/0x630 fs/namei.c:3823
                    do_mkdirat+0x267/0x3e0 fs/namei.c:3848
                    do_syscall_x64 arch/x86/entry/common.c:50 [inline]
                    do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
                    entry_SYSCALL_64_after_hwframe+0x44/0xae
   INITIAL USE at:
                   lock_acquire+0x182/0x4a0 kernel/locking/lockdep.c:5625
                   __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
                   _raw_spin_lock_irqsave+0xb3/0x100 kernel/locking/spinlock.c:159
                   snd_timer_resolution sound/core/timer.c:489 [inline]
                   snd_timer_user_params sound/core/timer.c:1852 [inline]
                   __snd_timer_user_ioctl+0x1df7/0x5ed0 sound/core/timer.c:2101
                   snd_timer_user_ioctl+0x5d/0x80 sound/core/timer.c:2129
                   vfs_ioctl fs/ioctl.c:51 [inline]
                   __do_sys_ioctl fs/ioctl.c:1069 [inline]
                   __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:1055
                   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
                   do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
                   entry_SYSCALL_64_after_hwframe+0x44/0xae
 }
 ... key      at: [<ffffffff90b60220>] snd_timer_new.__key+0x0/0x40
 ... acquired at:
   mark_usage kernel/locking/lockdep.c:4488 [inline]
   __lock_acquire+0xca1/0x6100 kernel/locking/lockdep.c:4969
   lock_acquire+0x182/0x4a0 kernel/locking/lockdep.c:5625
   __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
   _raw_spin_lock_irqsave+0xb3/0x100 kernel/locking/spinlock.c:159
   snd_timer_interrupt+0x210/0x1410 sound/core/timer.c:857
   call_timer_fn+0xf6/0x210 kernel/time/timer.c:1417
   expire_timers kernel/time/timer.c:1462 [inline]
   __run_timers+0x6ff/0x910 kernel/time/timer.c:1731
   run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1744
   __do_softirq+0x372/0x783 kernel/softirq.c:558
   invoke_softirq kernel/softirq.c:432 [inline]
   __irq_exit_rcu+0x21b/0x260 kernel/softirq.c:636
   irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
   sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1100
   asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
   __preempt_count_add arch/x86/include/asm/preempt.h:80 [inline]
   rcu_is_watching+0xd/0xb0 kernel/rcu/tree.c:1159
   rcu_read_lock include/linux/rcupdate.h:688 [inline]
   get_cached_acl+0x103/0x540 fs/posix_acl.c:44
   get_acl+0x20/0x2e0 fs/posix_acl.c:108
   posix_acl_create+0x119/0x560 fs/posix_acl.c:616
   ext4_init_acl+0xa6/0x3d0 fs/ext4/acl.c:282
   __ext4_new_inode+0x44e7/0x5810 fs/ext4/ialloc.c:1316
   ext4_mkdir+0x3fa/0xc10 fs/ext4/namei.c:2921
   vfs_mkdir+0x451/0x630 fs/namei.c:3823
   do_mkdirat+0x267/0x3e0 fs/namei.c:3848
   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
   do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
   entry_SYSCALL_64_after_hwframe+0x44/0xae

stack backtrace:
CPU: 1 PID: 8431 Comm: syz-executor065 Not tainted 5.14.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1ae/0x29f lib/dump_stack.c:105
 print_irq_inversion_bug+0xa58/0xda0 kernel/locking/lockdep.c:4000
 check_usage_forwards kernel/locking/lockdep.c:2585 [inline]
 mark_lock_irq kernel/locking/lockdep.c:4163 [inline]
 mark_lock+0x1064/0x1eb0 kernel/locking/lockdep.c:4593
 mark_usage kernel/locking/lockdep.c:4488 [inline]
 __lock_acquire+0xca1/0x6100 kernel/locking/lockdep.c:4969
 lock_acquire+0x182/0x4a0 kernel/locking/lockdep.c:5625
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0xb3/0x100 kernel/locking/spinlock.c:159
 snd_timer_interrupt+0x210/0x1410 sound/core/timer.c:857
 call_timer_fn+0xf6/0x210 kernel/time/timer.c:1417
 expire_timers kernel/time/timer.c:1462 [inline]
 __run_timers+0x6ff/0x910 kernel/time/timer.c:1731
 run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1744
 __do_softirq+0x372/0x783 kernel/softirq.c:558
 invoke_softirq kernel/softirq.c:432 [inline]
 __irq_exit_rcu+0x21b/0x260 kernel/softirq.c:636
 irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
 sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1100
 </IRQ>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:rcu_dynticks_curr_cpu_in_eqs kernel/rcu/tree.c:339 [inline]
RIP: 0010:rcu_is_watching+0xd/0xb0 kernel/rcu/tree.c:1160
Code: 41 5e 41 5f 5d c3 e8 92 a8 6d 08 41 f7 c4 00 02 00 00 75 b6 eb b5 e8 62 a8 6d 08 66 90 41 57 41 56 53 65 83 05 4b e3 96 7e 01 <e8> 1e bb 6d 08 89 c3 83 f8 08 73 74 49 bf 00 00 00 00 00 fc ff df
RSP: 0018:ffffc9000164f820 EFLAGS: 00000282
RAX: 12a9aafecb760900 RBX: 1ffff920002c9f0c RCX: ffffffff816213c5
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc9000164f8e8 R08: dffffc0000000000 R09: fffffbfff1f5e1b1
R10: fffffbfff1f5e1b1 R11: 0000000000000000 R12: 0000000000004000
R13: dffffc0000000000 R14: 1ffff920002c9f10 R15: ffff888039f60d48
 rcu_read_lock include/linux/rcupdate.h:688 [inline]
 get_cached_acl+0x103/0x540 fs/posix_acl.c:44
 get_acl+0x20/0x2e0 fs/posix_acl.c:108
 posix_acl_create+0x119/0x560 fs/posix_acl.c:616
 ext4_init_acl+0xa6/0x3d0 fs/ext4/acl.c:282
 __ext4_new_inode+0x44e7/0x5810 fs/ext4/ialloc.c:1316
 ext4_mkdir+0x3fa/0xc10 fs/ext4/namei.c:2921
 vfs_mkdir+0x451/0x630 fs/namei.c:3823
 do_mkdirat+0x267/0x3e0 fs/namei.c:3848
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x445d87
Code: 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc332de6a8 EFLAGS: 00000202 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 000000000000e3bb RCX: 0000000000445d87
RDX: 0000000000000000 RSI: 00000000000001ff RDI: 00007ffc332de740
RBP: 0000000000002ebc R08: 0000000000000000 R09: 0000000000000005
R10: 00007ffc332de445 R11: 0000000000000202 R12: 00007ffc332de6e4
R13: 00007ffc332de740 R14: 00000000000000bd R15: 431bde82d7b634db

---
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^ permalink raw reply	[flat|nested] 2+ messages in thread