possible deadlock in snd_timer_notify (2)

Status: fixed on 2023/02/24 13:50
Subsystems: fs
[Documentation on labels]
Reported-by: syzbot+49b10793b867871ee26f@syzkaller.appspotmail.com
Fix commit: 95cc637c1afd ALSA: timer: Use deferred fasync helper
First crash: 1723d, last: 1458d
▶ ▼ Discussions (16)
Title Replies (including bot) Last reply
[PATCH 5.4 000/389] 5.4.211-rc1 review 396 (396) 2022/10/26 16:43
[PATCH 5.19 000/365] 5.19.4-rc1 review 384 (384) 2022/08/29 09:33
[PATCH 4.19 000/287] 4.19.256-rc1 review 298 (298) 2022/08/25 10:11
[PATCH 4.9 000/101] 4.9.326-rc1 review 108 (108) 2022/08/24 07:24
[PATCH 4.14 000/229] 4.14.291-rc1 review 232 (232) 2022/08/24 06:23
[PATCH 5.15 000/244] 5.15.63-rc1 review 247 (247) 2022/08/23 21:46
[PATCH AUTOSEL 5.15 01/28] lib/list_debug.c: Detect uninitialized lists 29 (29) 2022/08/23 09:34
[PATCH 5.10 000/158] 5.10.138-rc1 review 159 (159) 2022/08/23 08:28
[PATCH AUTOSEL 5.19 01/48] lib/list_debug.c: Detect uninitialized lists 50 (50) 2022/08/20 14:33
[PATCH AUTOSEL 4.9 1/8] tty: serial: Fix refcount leak bug in ucc_uart.c 8 (8) 2022/08/14 16:30
[PATCH AUTOSEL 4.14 1/9] tty: serial: Fix refcount leak bug in ucc_uart.c 9 (9) 2022/08/14 16:29
[PATCH AUTOSEL 4.19 01/14] lib/list_debug.c: Detect uninitialized lists 14 (14) 2022/08/14 16:29
[PATCH AUTOSEL 5.4 01/16] lib/list_debug.c: Detect uninitialized lists 16 (16) 2022/08/14 16:28
[PATCH AUTOSEL 5.10 01/19] lib/list_debug.c: Detect uninitialized lists 19 (19) 2022/08/14 16:27
[PATCH AUTOSEL 5.18 01/39] lib/list_debug.c: Detect uninitialized lists 39 (39) 2022/08/14 16:23
[syzbot] possible deadlock in snd_timer_notify (2) 0 (1) 2021/11/12 18:58
▶ ▼ Similar bugs (1)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream possible deadlock in snd_timer_notify fs 4 119 1726d 1832d 20/29 fixed on 2021/11/10 00:50

Sample crash report:
=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
5.19.0-syzkaller-02858-ge2b542100719 #0 Not tainted
-----------------------------------------------------
syz-executor.2/19041 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffffffff8ba0a098 (tasklist_lock){.+.+}-{2:2}, at: send_sigio+0xab/0x370 fs/fcntl.c:791

and this task is already holding:
ffff888071ae9530 (&f->f_owner.lock){...-}-{2:2}, at: send_sigio+0x24/0x370 fs/fcntl.c:777
which would create a new lock dependency:
 (&f->f_owner.lock){...-}-{2:2} -> (tasklist_lock){.+.+}-{2:2}

but this new dependency connects a SOFTIRQ-irq-safe lock:
 (&timer->lock){..-.}-{2:2}

... which became SOFTIRQ-irq-safe at:
  lock_acquire kernel/locking/lockdep.c:5666 [inline]
  lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631
  __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
  _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162
  snd_timer_notify sound/core/timer.c:1086 [inline]
  snd_timer_notify+0x10c/0x3d0 sound/core/timer.c:1073
  snd_pcm_timer_notify sound/core/pcm_native.c:608 [inline]
  snd_pcm_post_stop+0x195/0x1f0 sound/core/pcm_native.c:1512
  snd_pcm_action_single sound/core/pcm_native.c:1283 [inline]
  snd_pcm_drain_done+0xdc/0x120 sound/core/pcm_native.c:1550
  snd_pcm_update_state+0x43b/0x540 sound/core/pcm_lib.c:191
  snd_pcm_update_hw_ptr0+0xa75/0x1a50 sound/core/pcm_lib.c:465
  snd_pcm_period_elapsed_under_stream_lock+0x15a/0x230 sound/core/pcm_lib.c:1817
  snd_pcm_period_elapsed+0x28/0x50 sound/core/pcm_lib.c:1849
  loopback_jiffies_timer_function+0x1c4/0x240 sound/drivers/aloop.c:668
  call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1474
  expire_timers kernel/time/timer.c:1519 [inline]
  __run_timers.part.0+0x679/0xa80 kernel/time/timer.c:1790
  __run_timers kernel/time/timer.c:1768 [inline]
  run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803
  __do_softirq+0x29b/0x9c2 kernel/softirq.c:571
  invoke_softirq kernel/softirq.c:445 [inline]
  __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650
  irq_exit_rcu+0x5/0x20 kernel/softirq.c:662
  sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1106
  asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649
  kasan_check_range+0xe/0x180 mm/kasan/generic.c:188
  instrument_atomic_read include/linux/instrumented.h:71 [inline]
  test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline]
  folio_test_swapcache include/linux/page-flags.h:563 [inline]
  folio_mapping+0x125/0x220 mm/util.c:803
  __folio_cancel_dirty+0x1e/0x3d0 mm/page-writeback.c:2791
  folio_cancel_dirty include/linux/pagemap.h:1068 [inline]
  truncate_cleanup_folio+0x203/0x3b0 mm/truncate.c:186
  truncate_inode_folio+0x40/0x70 mm/truncate.c:195
  shmem_undo_range+0x3fa/0x1560 mm/shmem.c:952
  shmem_truncate_range mm/shmem.c:1044 [inline]
  shmem_evict_inode+0x3c6/0xc20 mm/shmem.c:1133
  evict+0x2ed/0x6b0 fs/inode.c:664
  iput_final fs/inode.c:1744 [inline]
  iput.part.0+0x562/0x820 fs/inode.c:1770
  iput+0x58/0x70 fs/inode.c:1760
  do_unlinkat+0x41b/0x650 fs/namei.c:4267
  __do_sys_unlink fs/namei.c:4308 [inline]
  __se_sys_unlink fs/namei.c:4306 [inline]
  __x64_sys_unlink+0xc6/0x110 fs/namei.c:4306
  do_syscall_x64 arch/x86/entry/common.c:50 [inline]
  do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
  entry_SYSCALL_64_after_hwframe+0x63/0xcd

to a SOFTIRQ-irq-unsafe lock:
 (tasklist_lock){.+.+}-{2:2}

... which became SOFTIRQ-irq-unsafe at:
...
  lock_acquire kernel/locking/lockdep.c:5666 [inline]
  lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631
  __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
  _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228
  do_wait+0x284/0xce0 kernel/exit.c:1508
  kernel_wait+0x9c/0x150 kernel/exit.c:1698
  call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
  call_usermodehelper_exec_work+0xf5/0x180 kernel/umh.c:166
  process_one_work+0x996/0x1610 kernel/workqueue.c:2289
  worker_thread+0x665/0x1080 kernel/workqueue.c:2436
  kthread+0x2e9/0x3a0 kernel/kthread.c:376
  ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306

other info that might help us debug this:

Chain exists of:
  &timer->lock --> &f->f_owner.lock --> tasklist_lock

 Possible interrupt unsafe locking scenario:

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

 *** DEADLOCK ***

7 locks held by syz-executor.2/19041:
 #0: ffff8880433d0468 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_lock_nested fs/pipe.c:82 [inline]
 #0: ffff8880433d0468 (&pipe->mutex/1){+.+.}-{3:3}, at: pipe_lock+0x5a/0x70 fs/pipe.c:90
 #1: ffff8880281ac0f0 (sk_lock-AF_INET6){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1677 [inline]
 #1: ffff8880281ac0f0 (sk_lock-AF_INET6){+.+.}-{0:0}, at: tcp_splice_read+0x108/0x8b0 net/ipv4/tcp.c:788
 #2: ffffffff8bd87300 (rcu_read_lock){....}-{1:2}, at: sock_def_readable+0x0/0x4e0 net/core/sock.c:2234
 #3: ffffffff8bd87300 (rcu_read_lock){....}-{1:2}, at: rcu_read_unlock include/linux/rcupdate.h:735 [inline]
 #3: ffffffff8bd87300 (rcu_read_lock){....}-{1:2}, at: sock_def_readable+0x2aa/0x4e0 net/core/sock.c:3220
 #4: ffffffff8bd87300 (rcu_read_lock){....}-{1:2}, at: kill_fasync+0x41/0x470 fs/fcntl.c:1014
 #5: ffff88801fd0d558 (&new->fa_lock){....}-{2:2}, at: kill_fasync_rcu fs/fcntl.c:995 [inline]
 #5: ffff88801fd0d558 (&new->fa_lock){....}-{2:2}, at: kill_fasync fs/fcntl.c:1016 [inline]
 #5: ffff88801fd0d558 (&new->fa_lock){....}-{2:2}, at: kill_fasync+0x136/0x470 fs/fcntl.c:1009
 #6: ffff888071ae9530 (&f->f_owner.lock){...-}-{2:2}, at: send_sigio+0x24/0x370 fs/fcntl.c:777

the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
  -> (&timer->lock){..-.}-{2:2} {
     IN-SOFTIRQ-W at:
                        lock_acquire kernel/locking/lockdep.c:5666 [inline]
                        lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631
                        __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
                        _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162
                        snd_timer_notify sound/core/timer.c:1086 [inline]
                        snd_timer_notify+0x10c/0x3d0 sound/core/timer.c:1073
                        snd_pcm_timer_notify sound/core/pcm_native.c:608 [inline]
                        snd_pcm_post_stop+0x195/0x1f0 sound/core/pcm_native.c:1512
                        snd_pcm_action_single sound/core/pcm_native.c:1283 [inline]
                        snd_pcm_drain_done+0xdc/0x120 sound/core/pcm_native.c:1550
                        snd_pcm_update_state+0x43b/0x540 sound/core/pcm_lib.c:191
                        snd_pcm_update_hw_ptr0+0xa75/0x1a50 sound/core/pcm_lib.c:465
                        snd_pcm_period_elapsed_under_stream_lock+0x15a/0x230 sound/core/pcm_lib.c:1817
                        snd_pcm_period_elapsed+0x28/0x50 sound/core/pcm_lib.c:1849
                        loopback_jiffies_timer_function+0x1c4/0x240 sound/drivers/aloop.c:668
                        call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1474
                        expire_timers kernel/time/timer.c:1519 [inline]
                        __run_timers.part.0+0x679/0xa80 kernel/time/timer.c:1790
                        __run_timers kernel/time/timer.c:1768 [inline]
                        run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1803
                        __do_softirq+0x29b/0x9c2 kernel/softirq.c:571
                        invoke_softirq kernel/softirq.c:445 [inline]
                        __irq_exit_rcu+0x123/0x180 kernel/softirq.c:650
                        irq_exit_rcu+0x5/0x20 kernel/softirq.c:662
                        sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1106
                        asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:649
                        kasan_check_range+0xe/0x180 mm/kasan/generic.c:188
                        instrument_atomic_read include/linux/instrumented.h:71 [inline]
                        test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline]
                        folio_test_swapcache include/linux/page-flags.h:563 [inline]
                        folio_mapping+0x125/0x220 mm/util.c:803
                        __folio_cancel_dirty+0x1e/0x3d0 mm/page-writeback.c:2791
                        folio_cancel_dirty include/linux/pagemap.h:1068 [inline]
                        truncate_cleanup_folio+0x203/0x3b0 mm/truncate.c:186
                        truncate_inode_folio+0x40/0x70 mm/truncate.c:195
                        shmem_undo_range+0x3fa/0x1560 mm/shmem.c:952
                        shmem_truncate_range mm/shmem.c:1044 [inline]
                        shmem_evict_inode+0x3c6/0xc20 mm/shmem.c:1133
                        evict+0x2ed/0x6b0 fs/inode.c:664
                        iput_final fs/inode.c:1744 [inline]
                        iput.part.0+0x562/0x820 fs/inode.c:1770
                        iput+0x58/0x70 fs/inode.c:1760
                        do_unlinkat+0x41b/0x650 fs/namei.c:4267
                        __do_sys_unlink fs/namei.c:4308 [inline]
                        __se_sys_unlink fs/namei.c:4306 [inline]
                        __x64_sys_unlink+0xc6/0x110 fs/namei.c:4306
                        do_syscall_x64 arch/x86/entry/common.c:50 [inline]
                        do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
                        entry_SYSCALL_64_after_hwframe+0x63/0xcd
     INITIAL USE at:
                       lock_acquire kernel/locking/lockdep.c:5666 [inline]
                       lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631
                       __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
                       _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162
                       snd_timer_notify sound/core/timer.c:1086 [inline]
                       snd_timer_notify+0x10c/0x3d0 sound/core/timer.c:1073
                       snd_pcm_timer_notify sound/core/pcm_native.c:608 [inline]
                       snd_pcm_post_start+0x24a/0x310 sound/core/pcm_native.c:1451
                       snd_pcm_action_single+0xf4/0x130 sound/core/pcm_native.c:1283
                       snd_pcm_action+0x6e/0x90 sound/core/pcm_native.c:1364
                       __snd_pcm_lib_xfer+0x179c/0x1e10 sound/core/pcm_lib.c:2238
                       snd_pcm_oss_read3+0x1c4/0x400 sound/core/oss/pcm_oss.c:1292
                       io_capture_transfer+0x27e/0x330 sound/core/oss/io.c:73
                       snd_pcm_plug_read_transfer+0x1a4/0x2e0 sound/core/oss/pcm_plugin.c:663
                       snd_pcm_oss_read2+0x1db/0x3f0 sound/core/oss/pcm_oss.c:1493
                       snd_pcm_oss_read1 sound/core/oss/pcm_oss.c:1550 [inline]
                       snd_pcm_oss_read+0x620/0x7a0 sound/core/oss/pcm_oss.c:2788
                       vfs_read+0x1ef/0x5d0 fs/read_write.c:480
                       ksys_read+0x127/0x250 fs/read_write.c:620
                       do_syscall_x64 arch/x86/entry/common.c:50 [inline]
                       do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
                       entry_SYSCALL_64_after_hwframe+0x63/0xcd
   }
   ... key      at: [<ffffffff912cfbc0>] __key.10+0x0/0x40
 -> (&new->fa_lock){....}-{2:2} {
    INITIAL USE at:
                     lock_acquire kernel/locking/lockdep.c:5666 [inline]
                     lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631
                     __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
                     _raw_write_lock_irq+0x32/0x50 kernel/locking/spinlock.c:326
                     fasync_remove_entry+0xb6/0x1e0 fs/fcntl.c:872
                     fasync_helper+0x9e/0xb0 fs/fcntl.c:975
                     __fput+0x834/0x9d0 fs/file_table.c:314
                     task_work_run+0xdd/0x1a0 kernel/task_work.c:177
                     resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
                     exit_to_user_mode_loop kernel/entry/common.c:169 [inline]
                     exit_to_user_mode_prepare+0x23c/0x250 kernel/entry/common.c:201
                     __syscall_exit_to_user_mode_work kernel/entry/common.c:283 [inline]
                     syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:294
                     do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
                     entry_SYSCALL_64_after_hwframe+0x63/0xcd
    INITIAL READ USE at:
                          lock_acquire kernel/locking/lockdep.c:5666 [inline]
                          lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631
                          __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
                          _raw_read_lock_irqsave+0x70/0x90 kernel/locking/spinlock.c:236
                          kill_fasync_rcu fs/fcntl.c:995 [inline]
                          kill_fasync fs/fcntl.c:1016 [inline]
                          kill_fasync+0x136/0x470 fs/fcntl.c:1009
                          snd_timer_user_ccallback+0x298/0x330 sound/core/timer.c:1386
                          snd_timer_notify1+0x11c/0x3b0 sound/core/timer.c:516
                          snd_timer_start1+0x4d4/0x800 sound/core/timer.c:578
                          snd_timer_start sound/core/timer.c:696 [inline]
                          snd_timer_start sound/core/timer.c:689 [inline]
                          snd_timer_user_start.isra.0+0x1e3/0x260 sound/core/timer.c:1984
                          __snd_timer_user_ioctl.isra.0+0xda4/0x2490 sound/core/timer.c:2107
                          snd_timer_user_ioctl+0x77/0xb0 sound/core/timer.c:2128
                          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+0x193/0x200 fs/ioctl.c:856
                          do_syscall_x64 arch/x86/entry/common.c:50 [inline]
                          do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
                          entry_SYSCALL_64_after_hwframe+0x63/0xcd
  }
  ... key      at: [<ffffffff90fd56e0>] __key.0+0x0/0x40
  ... acquired at:
   __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
   _raw_read_lock_irqsave+0x70/0x90 kernel/locking/spinlock.c:236
   kill_fasync_rcu fs/fcntl.c:995 [inline]
   kill_fasync fs/fcntl.c:1016 [inline]
   kill_fasync+0x136/0x470 fs/fcntl.c:1009
   snd_timer_user_ccallback+0x298/0x330 sound/core/timer.c:1386
   snd_timer_notify1+0x11c/0x3b0 sound/core/timer.c:516
   snd_timer_start1+0x4d4/0x800 sound/core/timer.c:578
   snd_timer_start sound/core/timer.c:696 [inline]
   snd_timer_start sound/core/timer.c:689 [inline]
   snd_timer_user_start.isra.0+0x1e3/0x260 sound/core/timer.c:1984
   __snd_timer_user_ioctl.isra.0+0xda4/0x2490 sound/core/timer.c:2107
   snd_timer_user_ioctl+0x77/0xb0 sound/core/timer.c:2128
   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+0x193/0x200 fs/ioctl.c:856
   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
   do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
   entry_SYSCALL_64_after_hwframe+0x63/0xcd

-> (&f->f_owner.lock){...-}-{2:2} {
   IN-SOFTIRQ-R at:
                    lock_acquire kernel/locking/lockdep.c:5666 [inline]
                    lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631
                    __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
                    _raw_read_lock_irqsave+0x45/0x90 kernel/locking/spinlock.c:236
                    send_sigurg+0x1e/0xae0 fs/fcntl.c:816
                    sk_send_sigurg+0x76/0x310 net/core/sock.c:3275
                    tcp_check_urg net/ipv4/tcp_input.c:5604 [inline]
                    tcp_urg+0x38e/0xb40 net/ipv4/tcp_input.c:5645
                    tcp_rcv_established+0x81d/0x20e0 net/ipv4/tcp_input.c:5992
                    tcp_v6_do_rcv+0x810/0x13c0 net/ipv6/tcp_ipv6.c:1476
                    tcp_v6_rcv+0x2d9b/0x37f0 net/ipv6/tcp_ipv6.c:1735
                    ip6_protocol_deliver_rcu+0x2f4/0x1950 net/ipv6/ip6_input.c:439
                    ip6_input_finish+0x14c/0x2c0 net/ipv6/ip6_input.c:484
                    NF_HOOK include/linux/netfilter.h:307 [inline]
                    NF_HOOK include/linux/netfilter.h:301 [inline]
                    ip6_input+0x9c/0xd0 net/ipv6/ip6_input.c:493
                    dst_input include/net/dst.h:461 [inline]
                    ip6_rcv_finish net/ipv6/ip6_input.c:79 [inline]
                    NF_HOOK include/linux/netfilter.h:307 [inline]
                    NF_HOOK include/linux/netfilter.h:301 [inline]
                    ipv6_rcv+0x24c/0x380 net/ipv6/ip6_input.c:309
                    __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5484
                    __netif_receive_skb+0x24/0x1b0 net/core/dev.c:5598
                    process_backlog+0x3a0/0x7c0 net/core/dev.c:5926
                    __napi_poll+0xb3/0x6e0 net/core/dev.c:6492
                    napi_poll net/core/dev.c:6559 [inline]
                    net_rx_action+0x9c1/0xd90 net/core/dev.c:6670
                    __do_softirq+0x29b/0x9c2 kernel/softirq.c:571
                    do_softirq.part.0+0xde/0x130 kernel/softirq.c:472
                    do_softirq kernel/softirq.c:464 [inline]
                    __local_bh_enable_ip+0x102/0x120 kernel/softirq.c:396
                    sk_stream_wait_memory+0x608/0xed0 net/core/stream.c:145
                    tcp_sendmsg_locked+0x94b/0x3180 net/ipv4/tcp.c:1422
                    tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1460
                    inet6_sendmsg+0x99/0xe0 net/ipv6/af_inet6.c:652
                    sock_sendmsg_nosec net/socket.c:714 [inline]
                    sock_sendmsg+0xcf/0x120 net/socket.c:734
                    __sys_sendto+0x236/0x340 net/socket.c:2120
                    __do_sys_sendto net/socket.c:2132 [inline]
                    __se_sys_sendto net/socket.c:2128 [inline]
                    __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2128
                    do_syscall_x64 arch/x86/entry/common.c:50 [inline]
                    do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
                    entry_SYSCALL_64_after_hwframe+0x63/0xcd
   INITIAL USE at:
                   lock_acquire kernel/locking/lockdep.c:5666 [inline]
                   lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631
                   __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
                   _raw_write_lock_irq+0x32/0x50 kernel/locking/spinlock.c:326
                   f_modown+0x2a/0x390 fs/fcntl.c:90
                   __f_setown fs/fcntl.c:109 [inline]
                   f_setown+0xd7/0x230 fs/fcntl.c:137
                   do_fcntl+0x6f1/0x1040 fs/fcntl.c:376
                   __do_sys_fcntl fs/fcntl.c:453 [inline]
                   __se_sys_fcntl fs/fcntl.c:438 [inline]
                   __x64_sys_fcntl+0x15f/0x1d0 fs/fcntl.c:438
                   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
                   do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
                   entry_SYSCALL_64_after_hwframe+0x63/0xcd
   INITIAL READ USE at:
                        lock_acquire kernel/locking/lockdep.c:5666 [inline]
                        lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631
                        __raw_read_lock_irq include/linux/rwlock_api_smp.h:169 [inline]
                        _raw_read_lock_irq+0x63/0x80 kernel/locking/spinlock.c:244
                        f_getown+0x23/0x2a0 fs/fcntl.c:153
                        do_fcntl+0xbc4/0x1040 fs/fcntl.c:372
                        __do_sys_fcntl fs/fcntl.c:453 [inline]
                        __se_sys_fcntl fs/fcntl.c:438 [inline]
                        __x64_sys_fcntl+0x15f/0x1d0 fs/fcntl.c:438
                        do_syscall_x64 arch/x86/entry/common.c:50 [inline]
                        do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
                        entry_SYSCALL_64_after_hwframe+0x63/0xcd
 }
 ... key      at: [<ffffffff90fd4900>] __key.5+0x0/0x40
 ... acquired at:
   __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline]
   _raw_read_lock_irqsave+0x70/0x90 kernel/locking/spinlock.c:236
   send_sigio+0x24/0x370 fs/fcntl.c:777
   kill_fasync_rcu fs/fcntl.c:1002 [inline]
   kill_fasync fs/fcntl.c:1016 [inline]
   kill_fasync+0x1f8/0x470 fs/fcntl.c:1009
   snd_timer_user_ccallback+0x298/0x330 sound/core/timer.c:1386
   snd_timer_notify1+0x11c/0x3b0 sound/core/timer.c:516
   snd_timer_start1+0x4d4/0x800 sound/core/timer.c:578
   snd_timer_start sound/core/timer.c:696 [inline]
   snd_timer_start sound/core/timer.c:689 [inline]
   snd_timer_user_start.isra.0+0x1e3/0x260 sound/core/timer.c:1984
   __snd_timer_user_ioctl.isra.0+0xda4/0x2490 sound/core/timer.c:2107
   snd_timer_user_ioctl+0x77/0xb0 sound/core/timer.c:2128
   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+0x193/0x200 fs/ioctl.c:856
   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
   do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
   entry_SYSCALL_64_after_hwframe+0x63/0xcd


the dependencies between the lock to be acquired
 and SOFTIRQ-irq-unsafe lock:
-> (tasklist_lock){.+.+}-{2:2} {
   HARDIRQ-ON-R at:
                    lock_acquire kernel/locking/lockdep.c:5666 [inline]
                    lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631
                    __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
                    _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228
                    do_wait+0x284/0xce0 kernel/exit.c:1508
                    kernel_wait+0x9c/0x150 kernel/exit.c:1698
                    call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
                    call_usermodehelper_exec_work+0xf5/0x180 kernel/umh.c:166
                    process_one_work+0x996/0x1610 kernel/workqueue.c:2289
                    worker_thread+0x665/0x1080 kernel/workqueue.c:2436
                    kthread+0x2e9/0x3a0 kernel/kthread.c:376
                    ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
   SOFTIRQ-ON-R at:
                    lock_acquire kernel/locking/lockdep.c:5666 [inline]
                    lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631
                    __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
                    _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228
                    do_wait+0x284/0xce0 kernel/exit.c:1508
                    kernel_wait+0x9c/0x150 kernel/exit.c:1698
                    call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
                    call_usermodehelper_exec_work+0xf5/0x180 kernel/umh.c:166
                    process_one_work+0x996/0x1610 kernel/workqueue.c:2289
                    worker_thread+0x665/0x1080 kernel/workqueue.c:2436
                    kthread+0x2e9/0x3a0 kernel/kthread.c:376
                    ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
   INITIAL USE at:
                   lock_acquire kernel/locking/lockdep.c:5666 [inline]
                   lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631
                   __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline]
                   _raw_write_lock_irq+0x32/0x50 kernel/locking/spinlock.c:326
                   copy_process+0x449d/0x70a0 kernel/fork.c:2378
                   kernel_clone+0xe7/0xab0 kernel/fork.c:2659
                   user_mode_thread+0xad/0xe0 kernel/fork.c:2728
                   rest_init+0x23/0x270 init/main.c:692
                   arch_call_rest_init+0xf/0x14 init/main.c:883
                   start_kernel+0x46e/0x48f init/main.c:1138
                   secondary_startup_64_no_verify+0xce/0xdb
   INITIAL READ USE at:
                        lock_acquire kernel/locking/lockdep.c:5666 [inline]
                        lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631
                        __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
                        _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228
                        do_wait+0x284/0xce0 kernel/exit.c:1508
                        kernel_wait+0x9c/0x150 kernel/exit.c:1698
                        call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
                        call_usermodehelper_exec_work+0xf5/0x180 kernel/umh.c:166
                        process_one_work+0x996/0x1610 kernel/workqueue.c:2289
                        worker_thread+0x665/0x1080 kernel/workqueue.c:2436
                        kthread+0x2e9/0x3a0 kernel/kthread.c:376
                        ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 }
 ... key      at: [<ffffffff8ba0a098>] tasklist_lock+0x18/0x40
 ... acquired at:
   lock_acquire kernel/locking/lockdep.c:5666 [inline]
   lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631
   __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
   _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228
   send_sigio+0xab/0x370 fs/fcntl.c:791
   kill_fasync_rcu fs/fcntl.c:1002 [inline]
   kill_fasync fs/fcntl.c:1016 [inline]
   kill_fasync+0x1f8/0x470 fs/fcntl.c:1009
   sock_wake_async+0xd2/0x160 net/socket.c:1419
   sk_wake_async include/net/sock.h:2466 [inline]
   sk_wake_async include/net/sock.h:2462 [inline]
   sock_def_readable+0x349/0x4e0 net/core/sock.c:3219
   tcp_data_ready+0x106/0x520 net/ipv4/tcp_input.c:4993
   tcp_data_queue+0x1bb2/0x4c60 net/ipv4/tcp_input.c:5067
   tcp_rcv_established+0x82f/0x20e0 net/ipv4/tcp_input.c:5995
   tcp_v6_do_rcv+0x810/0x13c0 net/ipv6/tcp_ipv6.c:1476
   sk_backlog_rcv include/net/sock.h:1047 [inline]
   __release_sock+0x134/0x3b0 net/core/sock.c:2849
   release_sock+0x54/0x1b0 net/core/sock.c:3404
   tcp_splice_read+0x508/0x8b0 net/ipv4/tcp.c:836
   sock_splice_read+0xb6/0x120 net/socket.c:1066
   do_splice_to+0x1b9/0x240 fs/splice.c:796
   splice_file_to_pipe+0x100/0x120 fs/splice.c:1018
   do_splice+0x1549/0x1920 fs/splice.c:1104
   __do_splice+0x134/0x250 fs/splice.c:1144
   __do_sys_splice fs/splice.c:1350 [inline]
   __se_sys_splice fs/splice.c:1332 [inline]
   __x64_sys_splice+0x198/0x250 fs/splice.c:1332
   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
   do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
   entry_SYSCALL_64_after_hwframe+0x63/0xcd


stack backtrace:
CPU: 0 PID: 19041 Comm: syz-executor.2 Not tainted 5.19.0-syzkaller-02858-ge2b542100719 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 print_bad_irq_dependency kernel/locking/lockdep.c:2609 [inline]
 check_irq_usage.cold+0x4c1/0x6b0 kernel/locking/lockdep.c:2848
 check_prev_add kernel/locking/lockdep.c:3099 [inline]
 check_prevs_add kernel/locking/lockdep.c:3214 [inline]
 validate_chain kernel/locking/lockdep.c:3829 [inline]
 __lock_acquire+0x2ad2/0x5660 kernel/locking/lockdep.c:5053
 lock_acquire kernel/locking/lockdep.c:5666 [inline]
 lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5631
 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline]
 _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228
 send_sigio+0xab/0x370 fs/fcntl.c:791
 kill_fasync_rcu fs/fcntl.c:1002 [inline]
 kill_fasync fs/fcntl.c:1016 [inline]
 kill_fasync+0x1f8/0x470 fs/fcntl.c:1009
 sock_wake_async+0xd2/0x160 net/socket.c:1419
 sk_wake_async include/net/sock.h:2466 [inline]
 sk_wake_async include/net/sock.h:2462 [inline]
 sock_def_readable+0x349/0x4e0 net/core/sock.c:3219
 tcp_data_ready+0x106/0x520 net/ipv4/tcp_input.c:4993
 tcp_data_queue+0x1bb2/0x4c60 net/ipv4/tcp_input.c:5067
 tcp_rcv_established+0x82f/0x20e0 net/ipv4/tcp_input.c:5995
 tcp_v6_do_rcv+0x810/0x13c0 net/ipv6/tcp_ipv6.c:1476
 sk_backlog_rcv include/net/sock.h:1047 [inline]
 __release_sock+0x134/0x3b0 net/core/sock.c:2849
 release_sock+0x54/0x1b0 net/core/sock.c:3404
 tcp_splice_read+0x508/0x8b0 net/ipv4/tcp.c:836
 sock_splice_read+0xb6/0x120 net/socket.c:1066
 do_splice_to+0x1b9/0x240 fs/splice.c:796
 splice_file_to_pipe+0x100/0x120 fs/splice.c:1018
 do_splice+0x1549/0x1920 fs/splice.c:1104
 __do_splice+0x134/0x250 fs/splice.c:1144
 __do_sys_splice fs/splice.c:1350 [inline]
 __se_sys_splice fs/splice.c:1332 [inline]
 __x64_sys_splice+0x198/0x250 fs/splice.c:1332
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f63b7689209
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f63b8708168 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 00007f63b779c030 RCX: 00007f63b7689209
RDX: 0000000000000005 RSI: 0000000000000000 RDI: 0000000000000007
RBP: 00007f63b76e3161 R08: 000800000406f40a R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f63b7ccfb1f R14: 00007f63b8708300 R15: 0000000000022000
 </TASK>

Crashes (151):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/08/03 17:25 upstream e2b542100719 1c9013ac .config console log report info ci-upstream-kasan-gce possible deadlock in snd_timer_notify
2022/07/30 18:24 upstream 620725263f42 fef302b1 .config console log report info ci-upstream-kasan-gce possible deadlock in snd_timer_notify
2022/07/30 06:00 upstream e65c6a46df94 fef302b1 .config console log report info ci-upstream-kasan-gce possible deadlock in snd_timer_notify
2022/07/13 07:55 upstream b047602d579b 5d921b08 .config console log report info ci-upstream-kasan-gce-selinux-root possible deadlock in snd_timer_notify
2022/07/12 01:06 upstream 5a29232d870d da3d6955 .config console log report info ci-upstream-kasan-gce-smack-root possible deadlock in snd_timer_notify
2022/07/10 22:02 upstream d9919d43cbf6 b5765a15 .config console log report info ci-upstream-kasan-gce-smack-root possible deadlock in snd_timer_notify
2022/07/08 13:06 upstream e8a4e1c1bb69 8442e655 .config console log report info ci-qemu-upstream possible deadlock in snd_timer_notify
2022/07/06 18:34 upstream 9f09069cde34 bff65f44 .config console log report info ci-upstream-kasan-gce possible deadlock in snd_timer_notify
2022/07/04 20:06 upstream c1084b6c5620 bff65f44 .config console log report info ci-upstream-kasan-gce-selinux-root possible deadlock in snd_timer_notify
2022/07/04 16:00 upstream 88084a3df167 bff65f44 .config console log report info ci-upstream-kasan-gce-selinux-root possible deadlock in snd_timer_notify
2022/07/04 03:53 upstream 88084a3df167 1434eec0 .config console log report info ci-upstream-kasan-gce-selinux-root possible deadlock in snd_timer_notify
2022/07/03 14:32 upstream 69cb6c6556ad 1434eec0 .config console log report info ci-upstream-kasan-gce-root possible deadlock in snd_timer_notify
2022/07/03 02:56 upstream 34074da5424c 1434eec0 .config console log report info ci-upstream-kasan-gce-selinux-root possible deadlock in snd_timer_notify
2022/06/21 23:56 upstream ca1fdab7fd27 0fc5c330 .config console log report info ci-upstream-kasan-gce possible deadlock in snd_timer_notify
2022/06/20 16:57 upstream 78ca55889a54 8d15e28d .config console log report info ci-upstream-kasan-gce possible deadlock in snd_timer_notify
2022/06/16 23:28 upstream 48a23ec6ff2b 1719ee24 .config console log report info ci-upstream-kasan-gce possible deadlock in snd_timer_notify
2022/06/14 21:15 upstream 24625f7d91fb 127d1faf .config console log report info ci-upstream-kasan-gce possible deadlock in snd_timer_notify
2022/06/12 02:13 upstream 7a68065eb9cd 0d5abf15 .config console log report info ci-upstream-kasan-gce possible deadlock in snd_timer_notify
2022/06/10 02:44 upstream 874c8ca1e60b 0d5abf15 .config console log report info ci-upstream-kasan-gce possible deadlock in snd_timer_notify
2022/05/31 08:16 upstream 8ab2afa23bd1 af70c3a9 .config console log report info ci-upstream-kasan-gce possible deadlock in snd_timer_notify
2022/05/28 14:16 upstream 9d004b2f4fea a46af346 .config console log report info ci-upstream-kasan-gce possible deadlock in snd_timer_notify
2022/05/27 11:24 upstream 7e284070abe5 116e7a7b .config console log report info ci-upstream-kasan-gce possible deadlock in snd_timer_notify
2022/05/26 23:15 upstream babf0bb978e3 3037caa9 .config console log report info ci-upstream-kasan-gce-smack-root possible deadlock in snd_timer_notify
2022/05/26 11:32 upstream 7e062cda7d90 3037caa9 .config console log report info ci-upstream-kasan-gce possible deadlock in snd_timer_notify
2022/05/25 12:46 upstream fdaf9a5840ac 647c0e27 .config console log report info ci-upstream-kasan-gce possible deadlock in snd_timer_notify
2022/05/24 01:22 upstream 1e57930e9f40 e7f9308d .config console log report info ci-upstream-kasan-gce possible deadlock in snd_timer_notify
2022/05/23 02:04 upstream 4b0986a3613c 7268fa62 .config console log report info ci-upstream-kasan-gce-smack-root possible deadlock in snd_timer_notify
2022/05/22 13:45 upstream eaea45fc0e7b 7268fa62 .config console log report info ci-upstream-kasan-gce-smack-root possible deadlock in snd_timer_notify
2022/05/22 12:29 upstream eaea45fc0e7b 7268fa62 .config console log report info ci-upstream-kasan-gce possible deadlock in snd_timer_notify
2022/05/22 10:14 upstream eaea45fc0e7b 7268fa62 .config console log report info ci-upstream-kasan-gce-smack-root possible deadlock in snd_timer_notify
2022/05/21 04:48 upstream 3b5e1590a267 7268fa62 .config console log report info ci-upstream-kasan-gce possible deadlock in snd_timer_notify
2022/05/20 17:01 upstream 3d7285a335ed bd37ad7e .config console log report info ci-upstream-kasan-gce-smack-root possible deadlock in snd_timer_notify
2022/05/20 15:25 upstream 3d7285a335ed cb1ac2e7 .config console log report info ci-upstream-kasan-gce-smack-root possible deadlock in snd_timer_notify
2022/05/20 02:19 upstream b015dcd62b86 cb1ac2e7 .config console log report info ci-upstream-kasan-gce possible deadlock in snd_timer_notify
2022/05/18 02:20 upstream 210e04ff7681 744a39e2 .config console log report info ci-upstream-kasan-gce-root possible deadlock in snd_timer_notify
2022/05/18 00:57 upstream 210e04ff7681 744a39e2 .config console log report info ci-upstream-kasan-gce-selinux-root possible deadlock in snd_timer_notify
2022/05/17 10:17 upstream 42226c989789 744a39e2 .config console log report info ci-upstream-kasan-gce possible deadlock in snd_timer_notify
2022/05/15 16:16 upstream bc403203d65a 744a39e2 .config console log report info ci-upstream-kasan-gce-root possible deadlock in snd_timer_notify
2022/05/15 15:02 upstream bc403203d65a 744a39e2 .config console log report info ci-upstream-kasan-gce-smack-root possible deadlock in snd_timer_notify
2022/05/12 00:24 upstream feb9c5e19e91 beb0b407 .config console log report info ci-upstream-kasan-gce possible deadlock in snd_timer_notify
2022/05/09 01:25 upstream c5eb0a61238d e60b1103 .config console log report info ci-upstream-kasan-gce possible deadlock in snd_timer_notify
2022/05/04 16:54 upstream 107c948d1d3e dc9e5259 .config console log report info ci-upstream-kasan-gce possible deadlock in snd_timer_notify
2022/05/03 05:40 upstream 9050ba3a61a4 2df221f6 .config console log report info ci-upstream-kasan-gce possible deadlock in snd_timer_notify
2022/05/02 12:13 upstream 672c0c517342 2df221f6 .config console log report info ci-upstream-kasan-gce possible deadlock in snd_timer_notify
2022/05/02 02:57 upstream 672c0c517342 2df221f6 .config console log report info ci-upstream-kasan-gce possible deadlock in snd_timer_notify
2022/05/01 04:31 upstream 57ae8a492116 2df221f6 .config console log report info ci-upstream-kasan-gce possible deadlock in snd_timer_notify
2021/11/11 11:45 upstream debe436e77c7 75b04091 .config console log report info ci-upstream-kasan-gce-root possible deadlock in snd_timer_notify
2021/11/10 19:08 upstream 89d714ab6043 75b04091 .config console log report info ci-upstream-kasan-gce-selinux-root possible deadlock in snd_timer_notify
2022/07/13 12:18 linux-next cb71b93c2dc3 5d921b08 .config console log report info ci-upstream-linux-next-kasan-gce-root possible deadlock in snd_timer_notify
* Struck through repros no longer work on HEAD.