syzbot


possible deadlock in snd_pcm_period_elapsed (2)

Status: fixed on 2021/11/10 00:50
Reported-by: syzbot+@syzkaller.appspotmail.com
Fix commit: f671a691e299 fcntl: fix potential deadlocks for &fown_struct.lock
First crash: 434d, last: 327d
similar bugs (2):
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream possible deadlock in snd_pcm_period_elapsed (3) C inconclusive 23 52d 277d 23/24 upstream: reported C repro on 2021/12/29 01:23
upstream possible deadlock in snd_pcm_period_elapsed 96 716d 717d 0/24 closed as dup on 2020/12/06 08:32

Sample crash report:
=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
5.15.0-syzkaller #0 Not tainted
-----------------------------------------------------
syz-executor.3/18081 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffff888021eb7558 (&new->fa_lock){....}-{2:2}, at: kill_fasync_rcu fs/fcntl.c:1014 [inline]
ffff888021eb7558 (&new->fa_lock){....}-{2:2}, at: kill_fasync+0x13b/0x430 fs/fcntl.c:1035

and this task is already holding:
ffff88814abda148 (&timer->lock){....}-{2:2}, at: snd_timer_start1+0x5b/0x640 sound/core/timer.c:541
which would create a new lock dependency:
 (&timer->lock){....}-{2:2} -> (&new->fa_lock){....}-{2:2}

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

... which became SOFTIRQ-irq-safe at:
  lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5640
  __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
  _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
  snd_pcm_period_elapsed+0x2c/0x210 sound/core/pcm_lib.c:1848
  dummy_hrtimer_callback+0x87/0x190 sound/drivers/dummy.c:377
  __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
  __hrtimer_run_queues+0x50b/0xa60 kernel/time/hrtimer.c:1749
  hrtimer_run_softirq+0x1b7/0x5d0 kernel/time/hrtimer.c:1766
  __do_softirq+0x392/0x7a3 kernel/softirq.c:558
  __irq_exit_rcu+0xec/0x170 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:1097
  asm_sysvec_apic_timer_interrupt+0x12/0x20
  tomoyo_check_acl+0xbd/0x430 security/tomoyo/domain.c:173
  tomoyo_path_permission+0x1af/0x370 security/tomoyo/file.c:586
  tomoyo_check_open_permission+0x2e9/0x490 security/tomoyo/file.c:777
  security_file_open+0x50/0x570 security/security.c:1635
  do_dentry_open+0x350/0x1020 fs/open.c:809
  do_open fs/namei.c:3426 [inline]
  path_openat+0x2896/0x3660 fs/namei.c:3559
  do_filp_open+0x277/0x4f0 fs/namei.c:3586
  do_sys_openat2+0x13b/0x500 fs/open.c:1212
  do_sys_open fs/open.c:1228 [inline]
  __do_sys_open fs/open.c:1236 [inline]
  __se_sys_open fs/open.c:1232 [inline]
  __x64_sys_open+0x221/0x270 fs/open.c:1232
  do_syscall_x64 arch/x86/entry/common.c:50 [inline]
  do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
  entry_SYSCALL_64_after_hwframe+0x44/0xae

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

... which became SOFTIRQ-irq-unsafe at:
...
  lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5640
  __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
  _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228
  do_wait+0x224/0x9d0 kernel/exit.c:1511
  kernel_wait+0xe4/0x230 kernel/exit.c:1701
  call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
  call_usermodehelper_exec_work+0xb4/0x220 kernel/umh.c:166
  process_one_work+0x853/0x1140 kernel/workqueue.c:2298
  worker_thread+0xac1/0x1320 kernel/workqueue.c:2445
  kthread+0x468/0x490 kernel/kthread.c:327
  ret_from_fork+0x1f/0x30

other info that might help us debug this:

Chain exists of:
  &group->lock --> &timer->lock --> tasklist_lock

 Possible interrupt unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(tasklist_lock);
                               local_irq_disable();
                               lock(&group->lock);
                               lock(&timer->lock);
  <Interrupt>
    lock(&group->lock);

 *** DEADLOCK ***

3 locks held by syz-executor.3/18081:
 #0: ffff888074907568 (&tu->ioctl_lock){+.+.}-{3:3}, at: snd_timer_user_ioctl+0x4d/0x80 sound/core/timer.c:2128
 #1: ffff88814abda148 (&timer->lock){....}-{2:2}, at: snd_timer_start1+0x5b/0x640 sound/core/timer.c:541
 #2: ffffffff8cb1d900 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x5/0x30 include/linux/rcupdate.h:267

the dependencies between SOFTIRQ-irq-safe lock and the holding lock:
 -> (&group->lock){..-.}-{2:2} {
    IN-SOFTIRQ-W at:
                      lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5640
                      __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
                      _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
                      snd_pcm_period_elapsed+0x2c/0x210 sound/core/pcm_lib.c:1848
                      dummy_hrtimer_callback+0x87/0x190 sound/drivers/dummy.c:377
                      __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
                      __hrtimer_run_queues+0x50b/0xa60 kernel/time/hrtimer.c:1749
                      hrtimer_run_softirq+0x1b7/0x5d0 kernel/time/hrtimer.c:1766
                      __do_softirq+0x392/0x7a3 kernel/softirq.c:558
                      __irq_exit_rcu+0xec/0x170 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:1097
                      asm_sysvec_apic_timer_interrupt+0x12/0x20
                      tomoyo_check_acl+0xbd/0x430 security/tomoyo/domain.c:173
                      tomoyo_path_permission+0x1af/0x370 security/tomoyo/file.c:586
                      tomoyo_check_open_permission+0x2e9/0x490 security/tomoyo/file.c:777
                      security_file_open+0x50/0x570 security/security.c:1635
                      do_dentry_open+0x350/0x1020 fs/open.c:809
                      do_open fs/namei.c:3426 [inline]
                      path_openat+0x2896/0x3660 fs/namei.c:3559
                      do_filp_open+0x277/0x4f0 fs/namei.c:3586
                      do_sys_openat2+0x13b/0x500 fs/open.c:1212
                      do_sys_open fs/open.c:1228 [inline]
                      __do_sys_open fs/open.c:1236 [inline]
                      __se_sys_open fs/open.c:1232 [inline]
                      __x64_sys_open+0x221/0x270 fs/open.c:1232
                      do_syscall_x64 arch/x86/entry/common.c:50 [inline]
                      do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
                      entry_SYSCALL_64_after_hwframe+0x44/0xae
    INITIAL USE at:
                     lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5640
                     __raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
                     _raw_spin_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:170
                     spin_lock_irq include/linux/spinlock.h:375 [inline]
                     snd_pcm_group_lock_irq sound/core/pcm_native.c:97 [inline]
                     snd_pcm_stream_lock_irq sound/core/pcm_native.c:136 [inline]
                     snd_pcm_hw_params+0xca/0x1740 sound/core/pcm_native.c:686
                     snd_pcm_oss_change_params_locked+0x2453/0x43e0 sound/core/oss/pcm_oss.c:947
                     snd_pcm_oss_change_params sound/core/oss/pcm_oss.c:1091 [inline]
                     snd_pcm_oss_make_ready sound/core/oss/pcm_oss.c:1150 [inline]
                     snd_pcm_oss_sync+0x587/0xee0 sound/core/oss/pcm_oss.c:1650
                     snd_pcm_oss_release+0x119/0x270 sound/core/oss/pcm_oss.c:2571
                     __fput+0x3fc/0x870 fs/file_table.c:280
                     task_work_run+0x146/0x1c0 kernel/task_work.c:164
                     tracehook_notify_resume include/linux/tracehook.h:189 [inline]
                     exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
                     exit_to_user_mode_prepare+0x209/0x220 kernel/entry/common.c:207
                     __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
                     syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:300
                     do_syscall_64+0x53/0xd0 arch/x86/entry/common.c:86
                     entry_SYSCALL_64_after_hwframe+0x44/0xae
  }
  ... key      at: [<ffffffff90fe8a80>] snd_pcm_group_init.__key+0x0/0x40
-> (&timer->lock){....}-{2:2} {
   INITIAL USE at:
                   lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5640
                   __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
                   _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
                   snd_timer_notify+0x105/0x3e0 sound/core/timer.c:1087
                   snd_pcm_timer_notify sound/core/pcm_native.c:595 [inline]
                   snd_pcm_post_stop sound/core/pcm_native.c:1453 [inline]
                   snd_pcm_action_single sound/core/pcm_native.c:1229 [inline]
                   snd_pcm_action sound/core/pcm_native.c:1310 [inline]
                   snd_pcm_stop+0x3b8/0x4c0 sound/core/pcm_native.c:1476
                   snd_pcm_drop+0x16d/0x290 sound/core/pcm_native.c:2155
                   snd_pcm_oss_sync+0x4f4/0xee0 sound/core/oss/pcm_oss.c:1721
                   snd_pcm_oss_release+0x119/0x270 sound/core/oss/pcm_oss.c:2571
                   __fput+0x3fc/0x870 fs/file_table.c:280
                   task_work_run+0x146/0x1c0 kernel/task_work.c:164
                   tracehook_notify_resume include/linux/tracehook.h:189 [inline]
                   exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
                   exit_to_user_mode_prepare+0x209/0x220 kernel/entry/common.c:207
                   __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
                   syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:300
                   do_syscall_64+0x53/0xd0 arch/x86/entry/common.c:86
                   entry_SYSCALL_64_after_hwframe+0x44/0xae
 }
 ... key      at: [<ffffffff90fe8040>] snd_timer_new.__key+0x0/0x40
 ... acquired at:
   lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5640
   __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
   _raw_spin_lock_irqsave+0xd1/0x120 kernel/locking/spinlock.c:162
   snd_timer_notify+0x105/0x3e0 sound/core/timer.c:1087
   snd_pcm_timer_notify sound/core/pcm_native.c:595 [inline]
   snd_pcm_post_stop sound/core/pcm_native.c:1453 [inline]
   snd_pcm_action_single sound/core/pcm_native.c:1229 [inline]
   snd_pcm_action sound/core/pcm_native.c:1310 [inline]
   snd_pcm_stop+0x3b8/0x4c0 sound/core/pcm_native.c:1476
   snd_pcm_drop+0x16d/0x290 sound/core/pcm_native.c:2155
   snd_pcm_oss_sync+0x4f4/0xee0 sound/core/oss/pcm_oss.c:1721
   snd_pcm_oss_release+0x119/0x270 sound/core/oss/pcm_oss.c:2571
   __fput+0x3fc/0x870 fs/file_table.c:280
   task_work_run+0x146/0x1c0 kernel/task_work.c:164
   tracehook_notify_resume include/linux/tracehook.h:189 [inline]
   exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
   exit_to_user_mode_prepare+0x209/0x220 kernel/entry/common.c:207
   __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
   syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:300
   do_syscall_64+0x53/0xd0 arch/x86/entry/common.c:86
   entry_SYSCALL_64_after_hwframe+0x44/0xae


the dependencies between the lock to be acquired
 and SOFTIRQ-irq-unsafe lock:
  -> (tasklist_lock){.+.+}-{2:2} {
     HARDIRQ-ON-R at:
                        lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5640
                        __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
                        _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228
                        do_wait+0x224/0x9d0 kernel/exit.c:1511
                        kernel_wait+0xe4/0x230 kernel/exit.c:1701
                        call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
                        call_usermodehelper_exec_work+0xb4/0x220 kernel/umh.c:166
                        process_one_work+0x853/0x1140 kernel/workqueue.c:2298
                        worker_thread+0xac1/0x1320 kernel/workqueue.c:2445
                        kthread+0x468/0x490 kernel/kthread.c:327
                        ret_from_fork+0x1f/0x30
     SOFTIRQ-ON-R at:
                        lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5640
                        __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
                        _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228
                        do_wait+0x224/0x9d0 kernel/exit.c:1511
                        kernel_wait+0xe4/0x230 kernel/exit.c:1701
                        call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
                        call_usermodehelper_exec_work+0xb4/0x220 kernel/umh.c:166
                        process_one_work+0x853/0x1140 kernel/workqueue.c:2298
                        worker_thread+0xac1/0x1320 kernel/workqueue.c:2445
                        kthread+0x468/0x490 kernel/kthread.c:327
                        ret_from_fork+0x1f/0x30
     INITIAL USE at:
                       lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5640
                       __raw_write_lock_irq include/linux/rwlock_api_smp.h:194 [inline]
                       _raw_write_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:316
                       copy_process+0x34b4/0x5ca0 kernel/fork.c:2310
                       kernel_clone+0x22a/0x7e0 kernel/fork.c:2581
                       kernel_thread+0x155/0x1d0 kernel/fork.c:2633
                       rest_init+0x21/0x2e0 init/main.c:690
                       start_kernel+0x4bf/0x56e init/main.c:1133
                       secondary_startup_64_no_verify+0xb1/0xbb
     INITIAL READ USE at:
                            lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5640
                            __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
                            _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228
                            do_wait+0x224/0x9d0 kernel/exit.c:1511
                            kernel_wait+0xe4/0x230 kernel/exit.c:1701
                            call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
                            call_usermodehelper_exec_work+0xb4/0x220 kernel/umh.c:166
                            process_one_work+0x853/0x1140 kernel/workqueue.c:2298
                            worker_thread+0xac1/0x1320 kernel/workqueue.c:2445
                            kthread+0x468/0x490 kernel/kthread.c:327
                            ret_from_fork+0x1f/0x30
   }
   ... key      at: [<ffffffff8c80a058>] tasklist_lock+0x18/0x40
   ... acquired at:
   lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5640
   __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
   _raw_read_lock+0x32/0x40 kernel/locking/spinlock.c:228
   send_sigio+0xbe/0x300 fs/fcntl.c:810
   kill_fasync_rcu fs/fcntl.c:1021 [inline]
   kill_fasync+0x1e4/0x430 fs/fcntl.c:1035
   sock_wake_async+0x133/0x150
   rcu_read_unlock include/linux/rcupdate.h:717 [inline]
   sk_wake_async+0x12e/0x200 include/net/sock.h:2401
   sock_def_readable+0x152/0x200 net/core/sock.c:3138
   unix_dgram_sendmsg+0x19cc/0x2a50 net/unix/af_unix.c:1941
   sock_sendmsg_nosec net/socket.c:704 [inline]
   sock_sendmsg net/socket.c:724 [inline]
   ____sys_sendmsg+0x5b9/0x910 net/socket.c:2409
   ___sys_sendmsg net/socket.c:2463 [inline]
   __sys_sendmmsg+0x3ba/0x750 net/socket.c:2549
   __do_sys_sendmmsg net/socket.c:2578 [inline]
   __se_sys_sendmmsg net/socket.c:2575 [inline]
   __x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2575
   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
   do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
   entry_SYSCALL_64_after_hwframe+0x44/0xae

 -> (&f->f_owner.lock){...-}-{2:2} {
    IN-SOFTIRQ-R at:
                      lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5640
                      __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
                      _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236
                      send_sigurg+0x25/0x360 fs/fcntl.c:835
                      sk_send_sigurg+0x6a/0xb0 net/core/sock.c:3172
                      tcp_check_urg net/ipv4/tcp_input.c:5567 [inline]
                      tcp_urg+0x2b6/0xb40 net/ipv4/tcp_input.c:5608
                      tcp_rcv_established+0x9ec/0x22b0 net/ipv4/tcp_input.c:5942
                      tcp_v6_do_rcv+0x4ed/0x1370 net/ipv6/tcp_ipv6.c:1522
                      tcp_v6_rcv+0x357f/0x43e0 net/ipv6/tcp_ipv6.c:1765
                      ip6_protocol_deliver_rcu+0x9a5/0x1310 net/ipv6/ip6_input.c:422
                      ip6_input_finish net/ipv6/ip6_input.c:463 [inline]
                      NF_HOOK include/linux/netfilter.h:307 [inline]
                      ip6_input+0x10b/0x190 net/ipv6/ip6_input.c:472
                      __netif_receive_skb_one_core net/core/dev.c:5462 [inline]
                      __netif_receive_skb+0x1d1/0x500 net/core/dev.c:5576
                      process_backlog+0x518/0x9a0 net/core/dev.c:6452
                      __napi_poll+0xbd/0x520 net/core/dev.c:7017
                      napi_poll net/core/dev.c:7084 [inline]
                      net_rx_action+0x61c/0xf30 net/core/dev.c:7171
                      __do_softirq+0x392/0x7a3 kernel/softirq.c:558
                      run_ksoftirqd+0xc1/0x120 kernel/softirq.c:920
                      smpboot_thread_fn+0x533/0x9d0 kernel/smpboot.c:164
                      kthread+0x468/0x490 kernel/kthread.c:327
                      ret_from_fork+0x1f/0x30
    INITIAL USE at:
                     lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5640
                     __raw_write_lock_irq include/linux/rwlock_api_smp.h:194 [inline]
                     _raw_write_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:316
                     f_modown+0x38/0x340 fs/fcntl.c:91
                     __f_setown fs/fcntl.c:110 [inline]
                     f_setown+0x113/0x1a0 fs/fcntl.c:138
                     do_fcntl+0x1a8/0x1560 fs/fcntl.c:393
                     __do_sys_fcntl fs/fcntl.c:472 [inline]
                     __se_sys_fcntl+0xd8/0x1b0 fs/fcntl.c:457
                     do_syscall_x64 arch/x86/entry/common.c:50 [inline]
                     do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
                     entry_SYSCALL_64_after_hwframe+0x44/0xae
    INITIAL READ USE at:
                          lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5640
                          __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
                          _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236
                          send_sigurg+0x25/0x360 fs/fcntl.c:835
                          sk_send_sigurg+0x6a/0xb0 net/core/sock.c:3172
                          tcp_check_urg net/ipv4/tcp_input.c:5567 [inline]
                          tcp_urg+0x2b6/0xb40 net/ipv4/tcp_input.c:5608
                          tcp_rcv_established+0x9ec/0x22b0 net/ipv4/tcp_input.c:5942
                          tcp_v4_do_rcv+0x3eb/0x950 net/ipv4/tcp_ipv4.c:1716
                          sk_backlog_rcv include/net/sock.h:1030 [inline]
                          __release_sock+0x1d8/0x4c0 net/core/sock.c:2768
                          release_sock+0x5d/0x1c0 net/core/sock.c:3300
                          sk_stream_wait_memory+0x6f9/0xdc0 net/core/stream.c:145
                          tcp_sendmsg_locked+0x1115/0x3e50 net/ipv4/tcp.c:1384
                          tcp_sendmsg+0x2c/0x40 net/ipv4/tcp.c:1422
                          sock_sendmsg_nosec net/socket.c:704 [inline]
                          sock_sendmsg net/socket.c:724 [inline]
                          __sys_sendto+0x42e/0x5b0 net/socket.c:2036
                          __do_sys_sendto net/socket.c:2048 [inline]
                          __se_sys_sendto net/socket.c:2044 [inline]
                          __x64_sys_sendto+0xda/0xf0 net/socket.c:2044
                          do_syscall_x64 arch/x86/entry/common.c:50 [inline]
                          do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
                          entry_SYSCALL_64_after_hwframe+0x44/0xae
  }
  ... key      at: [<ffffffff90c59d40>] __alloc_file.__key+0x0/0x10
  ... acquired at:
   lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5640
   __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
   _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236
   send_sigio+0x2f/0x300 fs/fcntl.c:796
   kill_fasync_rcu fs/fcntl.c:1021 [inline]
   kill_fasync+0x1e4/0x430 fs/fcntl.c:1035
   sock_wake_async+0x133/0x150
   rcu_read_unlock include/linux/rcupdate.h:717 [inline]
   sk_wake_async+0x12e/0x200 include/net/sock.h:2401
   sock_def_readable+0x152/0x200 net/core/sock.c:3138
   unix_dgram_sendmsg+0x19cc/0x2a50 net/unix/af_unix.c:1941
   sock_sendmsg_nosec net/socket.c:704 [inline]
   sock_sendmsg net/socket.c:724 [inline]
   ____sys_sendmsg+0x5b9/0x910 net/socket.c:2409
   ___sys_sendmsg net/socket.c:2463 [inline]
   __sys_sendmmsg+0x3ba/0x750 net/socket.c:2549
   __do_sys_sendmmsg net/socket.c:2578 [inline]
   __se_sys_sendmmsg net/socket.c:2575 [inline]
   __x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2575
   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
   do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
   entry_SYSCALL_64_after_hwframe+0x44/0xae

-> (&new->fa_lock){....}-{2:2} {
   INITIAL USE at:
                   lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5640
                   __raw_write_lock_irq include/linux/rwlock_api_smp.h:194 [inline]
                   _raw_write_lock_irq+0xcf/0x110 kernel/locking/spinlock.c:316
                   fasync_remove_entry+0xff/0x1d0 fs/fcntl.c:891
                   sock_fasync+0x86/0xf0 net/socket.c:1339
                   __fput+0x71e/0x870 fs/file_table.c:277
                   task_work_run+0x146/0x1c0 kernel/task_work.c:164
                   tracehook_notify_resume include/linux/tracehook.h:189 [inline]
                   exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
                   exit_to_user_mode_prepare+0x209/0x220 kernel/entry/common.c:207
                   __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
                   syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:300
                   do_syscall_64+0x53/0xd0 arch/x86/entry/common.c:86
                   entry_SYSCALL_64_after_hwframe+0x44/0xae
   INITIAL READ USE at:
                        lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5640
                        __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
                        _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236
                        kill_fasync_rcu fs/fcntl.c:1014 [inline]
                        kill_fasync+0x13b/0x430 fs/fcntl.c:1035
                        sock_wake_async+0x133/0x150
                        rcu_read_unlock include/linux/rcupdate.h:717 [inline]
                        sk_wake_async+0x12e/0x200 include/net/sock.h:2401
                        sock_def_readable+0x152/0x200 net/core/sock.c:3138
                        unix_dgram_sendmsg+0x19cc/0x2a50 net/unix/af_unix.c:1941
                        sock_sendmsg_nosec net/socket.c:704 [inline]
                        sock_sendmsg net/socket.c:724 [inline]
                        ____sys_sendmsg+0x5b9/0x910 net/socket.c:2409
                        ___sys_sendmsg net/socket.c:2463 [inline]
                        __sys_sendmmsg+0x3ba/0x750 net/socket.c:2549
                        __do_sys_sendmmsg net/socket.c:2578 [inline]
                        __se_sys_sendmmsg net/socket.c:2575 [inline]
                        __x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2575
                        do_syscall_x64 arch/x86/entry/common.c:50 [inline]
                        do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
                        entry_SYSCALL_64_after_hwframe+0x44/0xae
 }
 ... key      at: [<ffffffff90c5ac00>] fasync_insert_entry.__key+0x0/0x40
 ... acquired at:
   lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5640
   __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
   _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236
   kill_fasync_rcu fs/fcntl.c:1014 [inline]
   kill_fasync+0x13b/0x430 fs/fcntl.c:1035
   snd_timer_user_ccallback+0x370/0x540 sound/core/timer.c:1387
   snd_timer_notify1+0x1ad/0x350 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+0xb56/0x5920 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:874 [inline]
   __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:860
   do_syscall_x64 arch/x86/entry/common.c:50 [inline]
   do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
   entry_SYSCALL_64_after_hwframe+0x44/0xae


stack backtrace:
CPU: 0 PID: 18081 Comm: syz-executor.3 Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1dc/0x2d8 lib/dump_stack.c:106
 print_bad_irq_dependency kernel/locking/lockdep.c:2580 [inline]
 check_irq_usage kernel/locking/lockdep.c:2819 [inline]
 check_prev_add kernel/locking/lockdep.c:3070 [inline]
 check_prevs_add kernel/locking/lockdep.c:3189 [inline]
 validate_chain+0x6f4c/0x8240 kernel/locking/lockdep.c:3804
 __lock_acquire+0x1382/0x2b00 kernel/locking/lockdep.c:5030
 lock_acquire+0x19f/0x4d0 kernel/locking/lockdep.c:5640
 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
 _raw_read_lock_irqsave+0xd9/0x120 kernel/locking/spinlock.c:236
 kill_fasync_rcu fs/fcntl.c:1014 [inline]
 kill_fasync+0x13b/0x430 fs/fcntl.c:1035
 snd_timer_user_ccallback+0x370/0x540 sound/core/timer.c:1387
 snd_timer_notify1+0x1ad/0x350 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+0xb56/0x5920 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:874 [inline]
 __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fc4c0ffbae9
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fc4be52f188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fc4c110f0e0 RCX: 00007fc4c0ffbae9
RDX: 0000000000000000 RSI: 00000000000054a0 RDI: 0000000000000003
RBP: 00007fc4c1055f25 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff1c5f213f R14: 00007fc4be52f300 R15: 0000000000022000
 </TASK>

Crashes (52):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-smack-root 2021/11/08 13:10 upstream 6b75d88fa81b d29682f1 .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/11/04 11:22 upstream ce840177930f 4c1be0be .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/11/01 00:07 upstream 8bb7eca972ad 098b5d53 .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/10/29 21:48 upstream f25a5481af12 098b5d53 .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/10/29 07:01 upstream 411a44c24a56 2353a3ec .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/10/27 12:24 upstream d25f27432f80 373bf66b .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/10/27 06:08 upstream d25f27432f80 d50eb50a .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/10/26 15:28 upstream 3906fe9bb7f1 d50eb50a .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/10/25 08:09 upstream 87066fdd2e30 4f0000ee .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/10/22 21:51 upstream 64222515138e 282f03fb .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/10/19 01:08 upstream 519d81956ee2 24dc29db .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/10/18 08:46 upstream cf52ad5ff16c 0c5d9412 .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/10/13 22:56 upstream 348949d9a444 5462d470 .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/10/09 06:33 upstream 741668ef7832 efe0f24d .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/10/05 18:27 upstream f6274b06e326 0a63fd36 .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/10/04 19:48 upstream 84b3e42564ac ce697b49 .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/10/01 07:30 upstream 4de593fb965f 1d849ab4 .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/10/01 06:01 upstream 4de593fb965f 1d849ab4 .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/09/29 04:54 upstream a4e6f95a891a d82cb927 .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/09/28 18:24 upstream d33bec7b3dfa d82cb927 .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/09/28 14:52 upstream 0513e464f900 d82cb927 .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/09/27 11:43 upstream 5816b3e6577e 78494d16 .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/09/26 15:54 upstream a3b397b4fffb 8cac236e .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/09/25 10:30 upstream 7d42e9818258 8cac236e .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/09/24 05:22 upstream f9e36107ec70 8cac236e .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/09/20 17:33 upstream e4e737bb5c17 af796c18 .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/09/17 03:54 upstream bdb575f87217 5b989942 .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/09/11 05:36 upstream 926de8c4326c 5ae8508a .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/09/10 06:08 upstream bf9f243f23e6 e2776ee4 .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/08/27 23:08 upstream 77dd11439b86 d5a29e53 .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/08/27 10:35 upstream 77dd11439b86 b318694d .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/08/26 21:14 upstream 1a6d80ff2419 b318694d .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/08/26 21:05 upstream 1a6d80ff2419 b318694d .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/08/26 00:19 upstream fe67f4dd8daa b599f2fc .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/08/24 00:48 upstream d5ae8d7f85b7 b599f2fc .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/08/24 00:35 upstream d5ae8d7f85b7 b599f2fc .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/08/23 09:20 upstream e22ce8eb631b b599f2fc .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/08/23 08:59 upstream e22ce8eb631b b599f2fc .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/08/20 19:00 upstream d992fe5318d8 b599f2fc .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/08/19 17:01 upstream d6d09a694205 b599f2fc .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/08/19 06:40 upstream d6d09a694205 a2fe1cb5 .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/08/17 16:12 upstream 794c7931a242 a2fe1cb5 .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/08/17 14:53 upstream 794c7931a242 33c26cb7 .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/08/01 23:50 upstream d4affd6b6e81 6c236867 .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/08/01 22:30 upstream d4affd6b6e81 6c236867 .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/07/30 17:53 upstream 764a5bc89b12 6c236867 .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/07/30 17:13 upstream 764a5bc89b12 c585c7b0 .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/07/30 00:57 upstream 7e96bf476270 c585c7b0 .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/07/29 13:42 upstream 4010a528219e b44001ce .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/07/28 22:53 upstream 4010a528219e 9a4781d4 .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/07/26 05:09 upstream d8079fac1681 4d1b57d4 .config log report info possible deadlock in snd_pcm_period_elapsed
ci-upstream-kasan-gce-smack-root 2021/07/24 19:30 upstream f0fddcec6b62 4d1b57d4 .config log report info possible deadlock in snd_pcm_period_elapsed
* Struck through repros no longer work on HEAD.