[syzbot] possible deadlock in snd_timer_notify (2)

From: syzbot
Date: Fri Nov 12 2021 - 13:58:33 EST

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Hello,

syzbot found the following issue on:

HEAD commit: debe436e77c7 Merge tag 'ext4_for_linus' of git://git.kerne..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1060c32ab00000
kernel config: https://syzkaller.appspot.com/x/.config?x=9d7259f0deb293aa
dashboard link: https://syzkaller.appspot.com/bug?extid=49b10793b867871ee26f
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+49b10793b867871ee26f@xxxxxxxxxxxxxxxxxxxxxxxxx

=====================================================
WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected
5.15.0-syzkaller #0 Not tainted
-----------------------------------------------------
syz-executor.0/15830 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
ffff888076cbade0 (&new->fa_lock){...-}-{2:2}, at: kill_fasync_rcu fs/fcntl.c:1014 [inline]
ffff888076cbade0 (&new->fa_lock){...-}-{2:2}, at: kill_fasync fs/fcntl.c:1035 [inline]
ffff888076cbade0 (&new->fa_lock){...-}-{2:2}, at: kill_fasync+0x136/0x470 fs/fcntl.c:1028

and this task is already holding:
ffff88802171d948 (&timer->lock){..-.}-{2:2}, at: snd_timer_start1+0x5a/0x800 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:
(&timer->lock){..-.}-{2:2}

... which became SOFTIRQ-irq-safe at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__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:1087 [inline]
snd_timer_notify+0x10c/0x3d0 sound/core/timer.c:1074
snd_pcm_timer_notify sound/core/pcm_native.c:595 [inline]
snd_pcm_post_stop+0x195/0x1f0 sound/core/pcm_native.c:1453
snd_pcm_action_single sound/core/pcm_native.c:1229 [inline]
snd_pcm_drain_done+0xdc/0x120 sound/core/pcm_native.c:1491
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
dummy_hrtimer_callback+0x94/0x1b0 sound/drivers/dummy.c:377
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1749
hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1766
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x123/0x180 kernel/softirq.c:636
irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
__memset+0x24/0x30 arch/x86/lib/memset_64.S:38
slab_post_alloc_hook mm/slab.h:521 [inline]
slab_alloc_node mm/slub.c:3234 [inline]
slab_alloc mm/slub.c:3242 [inline]
kmem_cache_alloc_trace+0x20b/0x2c0 mm/slub.c:3259
kmalloc include/linux/slab.h:590 [inline]
pty_common_install+0xd4/0xa70 drivers/tty/pty.c:381
tty_driver_install_tty drivers/tty/tty_io.c:1315 [inline]
tty_init_dev.part.0+0x9e/0x610 drivers/tty/tty_io.c:1429
tty_init_dev+0x5b/0x80 drivers/tty/tty_io.c:1419
ptmx_open drivers/tty/pty.c:834 [inline]
ptmx_open+0x112/0x360 drivers/tty/pty.c:800
chrdev_open+0x266/0x770 fs/char_dev.c:414
do_dentry_open+0x4c8/0x1250 fs/open.c:822
do_open fs/namei.c:3426 [inline]
path_openat+0x1cad/0x2750 fs/namei.c:3559
do_filp_open+0x1aa/0x400 fs/namei.c:3586
do_sys_openat2+0x16d/0x4d0 fs/open.c:1212
do_sys_open fs/open.c:1228 [inline]
__do_sys_openat fs/open.c:1244 [inline]
__se_sys_openat fs/open.c:1239 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1239
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+0x44/0xae

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

... which became SOFTIRQ-irq-unsafe at:
...
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228
do_wait+0x284/0xce0 kernel/exit.c:1511
kernel_wait+0x9c/0x150 kernel/exit.c:1701
call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
call_usermodehelper_exec_work+0xf5/0x180 kernel/umh.c:166
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

other info that might help us debug this:

Chain exists of:
&timer->lock --> &new->fa_lock --> tasklist_lock

Possible interrupt unsafe locking scenario:

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

*** DEADLOCK ***

3 locks held by syz-executor.0/15830:
#0: ffff88807bd80168 (&tu->ioctl_lock){+.+.}-{3:3}, at: snd_timer_user_ioctl+0x4c/0xb0 sound/core/timer.c:2128
#1: ffff88802171d948 (&timer->lock){..-.}-{2:2}, at: snd_timer_start1+0x5a/0x800 sound/core/timer.c:541
#2: ffffffff8b983a20 (rcu_read_lock){....}-{1:2}, at: kill_fasync+0x41/0x470 fs/fcntl.c:1033

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:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__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:1087 [inline]
snd_timer_notify+0x10c/0x3d0 sound/core/timer.c:1074
snd_pcm_timer_notify sound/core/pcm_native.c:595 [inline]
snd_pcm_post_stop+0x195/0x1f0 sound/core/pcm_native.c:1453
snd_pcm_action_single sound/core/pcm_native.c:1229 [inline]
snd_pcm_drain_done+0xdc/0x120 sound/core/pcm_native.c:1491
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
dummy_hrtimer_callback+0x94/0x1b0 sound/drivers/dummy.c:377
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1749
hrtimer_run_softirq+0x17b/0x360 kernel/time/hrtimer.c:1766
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
invoke_softirq kernel/softirq.c:432 [inline]
__irq_exit_rcu+0x123/0x180 kernel/softirq.c:636
irq_exit_rcu+0x5/0x20 kernel/softirq.c:648
sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097
asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
__memset+0x24/0x30 arch/x86/lib/memset_64.S:38
slab_post_alloc_hook mm/slab.h:521 [inline]
slab_alloc_node mm/slub.c:3234 [inline]
slab_alloc mm/slub.c:3242 [inline]
kmem_cache_alloc_trace+0x20b/0x2c0 mm/slub.c:3259
kmalloc include/linux/slab.h:590 [inline]
pty_common_install+0xd4/0xa70 drivers/tty/pty.c:381
tty_driver_install_tty drivers/tty/tty_io.c:1315 [inline]
tty_init_dev.part.0+0x9e/0x610 drivers/tty/tty_io.c:1429
tty_init_dev+0x5b/0x80 drivers/tty/tty_io.c:1419
ptmx_open drivers/tty/pty.c:834 [inline]
ptmx_open+0x112/0x360 drivers/tty/pty.c:800
chrdev_open+0x266/0x770 fs/char_dev.c:414
do_dentry_open+0x4c8/0x1250 fs/open.c:822
do_open fs/namei.c:3426 [inline]
path_openat+0x1cad/0x2750 fs/namei.c:3559
do_filp_open+0x1aa/0x400 fs/namei.c:3586
do_sys_openat2+0x16d/0x4d0 fs/open.c:1212
do_sys_open fs/open.c:1228 [inline]
__do_sys_openat fs/open.c:1244 [inline]
__se_sys_openat fs/open.c:1239 [inline]
__x64_sys_openat+0x13f/0x1f0 fs/open.c:1239
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+0x44/0xae
INITIAL USE at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
_raw_spin_lock_irq+0x32/0x50 kernel/locking/spinlock.c:170
spin_lock_irq include/linux/spinlock.h:374 [inline]
snd_timer_close_locked+0x63/0xbb0 sound/core/timer.c:396
snd_timer_close+0x87/0xf0 sound/core/timer.c:463
snd_seq_timer_close+0x8c/0xe0 sound/core/seq/seq_timer.c:326
queue_delete+0x4a/0xa0 sound/core/seq/seq_queue.c:134
snd_seq_queue_delete+0x45/0x60 sound/core/seq/seq_queue.c:196
snd_seq_kernel_client_ctl+0x102/0x1e0 sound/core/seq/seq_clientmgr.c:2369
delete_seq_queue.part.0.isra.0+0xa2/0x110 sound/core/seq/oss/seq_oss_init.c:377
delete_seq_queue sound/core/seq/oss/seq_oss_init.c:373 [inline]
snd_seq_oss_release+0x10b/0x1a0 sound/core/seq/oss/seq_oss_init.c:422
odev_release+0x4f/0x70 sound/core/seq/oss/seq_oss.c:144
__fput+0x286/0x9f0 fs/file_table.c:280
task_work_run+0xdd/0x1a0 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+0x27e/0x290 kernel/entry/common.c:207
__syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
}
... key at: [<ffffffff9061a800>] __key.12+0x0/0x40

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:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228
do_wait+0x284/0xce0 kernel/exit.c:1511
kernel_wait+0x9c/0x150 kernel/exit.c:1701
call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
call_usermodehelper_exec_work+0xf5/0x180 kernel/umh.c:166
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
SOFTIRQ-ON-R at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228
do_wait+0x284/0xce0 kernel/exit.c:1511
kernel_wait+0x9c/0x150 kernel/exit.c:1701
call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
call_usermodehelper_exec_work+0xf5/0x180 kernel/umh.c:166
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
INITIAL USE at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__raw_write_lock_irq include/linux/rwlock_api_smp.h:194 [inline]
_raw_write_lock_irq+0x32/0x50 kernel/locking/spinlock.c:316
copy_process+0x36c0/0x75a0 kernel/fork.c:2310
kernel_clone+0xe7/0xab0 kernel/fork.c:2581
kernel_thread+0xb5/0xf0 kernel/fork.c:2633
rest_init+0x23/0x3e0 init/main.c:690
start_kernel+0x47a/0x49b init/main.c:1135
secondary_startup_64_no_verify+0xb0/0xbb
INITIAL READ USE at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228
do_wait+0x284/0xce0 kernel/exit.c:1511
kernel_wait+0x9c/0x150 kernel/exit.c:1701
call_usermodehelper_exec_sync kernel/umh.c:139 [inline]
call_usermodehelper_exec_work+0xf5/0x180 kernel/umh.c:166
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2298
worker_thread+0x658/0x11f0 kernel/workqueue.c:2445
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
}
... key at: [<ffffffff8b60a098>] tasklist_lock+0x18/0x40
... acquired at:
__raw_read_lock include/linux/rwlock_api_smp.h:149 [inline]
_raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228
send_sigio+0xab/0x380 fs/fcntl.c:810
kill_fasync_rcu fs/fcntl.c:1021 [inline]
kill_fasync fs/fcntl.c:1035 [inline]
kill_fasync+0x1f8/0x470 fs/fcntl.c:1028
__receive_buf drivers/tty/n_tty.c:1591 [inline]
n_tty_receive_buf_common+0x12d7/0x4780 drivers/tty/n_tty.c:1674
tty_ldisc_receive_buf+0xa3/0x190 drivers/tty/tty_buffer.c:471
paste_selection+0x1de/0x4c0 drivers/tty/vt/selection.c:408
tioclinux+0x126/0x560 drivers/tty/vt/vt.c:3204
vt_ioctl+0x229a/0x2b10 drivers/tty/vt/vt_ioctl.c:762
tty_ioctl+0xbbd/0x1670 drivers/tty/tty_io.c:2805
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
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+0x44/0xae

-> (&f->f_owner.lock){...-}-{2:2} {
IN-SOFTIRQ-R at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
_raw_read_lock_irqsave+0x45/0x90 kernel/locking/spinlock.c:236
send_sigurg+0x1e/0xaf0 fs/fcntl.c:835
sk_send_sigurg+0x76/0x310 net/core/sock.c:3172
tcp_check_urg.isra.0+0x1f3/0x710 net/ipv4/tcp_input.c:5567
tcp_urg net/ipv4/tcp_input.c:5608 [inline]
tcp_rcv_established+0x12ab/0x2130 net/ipv4/tcp_input.c:5942
tcp_v6_do_rcv+0x461/0x1320 net/ipv6/tcp_ipv6.c:1522
tcp_v6_rcv+0x236d/0x2cb0 net/ipv6/tcp_ipv6.c:1765
ip6_protocol_deliver_rcu+0x2e9/0x1ca0 net/ipv6/ip6_input.c:422
ip6_input_finish+0x62/0x170 net/ipv6/ip6_input.c:463
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:472
dst_input include/net/dst.h:460 [inline]
ip6_rcv_finish net/ipv6/ip6_input.c:76 [inline]
NF_HOOK include/linux/netfilter.h:307 [inline]
NF_HOOK include/linux/netfilter.h:301 [inline]
ipv6_rcv+0x28c/0x3c0 net/ipv6/ip6_input.c:297
__netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5462
__netif_receive_skb+0x24/0x1b0 net/core/dev.c:5576
process_backlog+0x2a5/0x6c0 net/core/dev.c:6452
__napi_poll+0xaf/0x440 net/core/dev.c:7017
napi_poll net/core/dev.c:7084 [inline]
net_rx_action+0x801/0xb40 net/core/dev.c:7171
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
run_ksoftirqd kernel/softirq.c:920 [inline]
run_ksoftirqd+0x2d/0x60 kernel/softirq.c:912
smpboot_thread_fn+0x645/0x9c0 kernel/smpboot.c:164
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
INITIAL USE at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__raw_write_lock_irq include/linux/rwlock_api_smp.h:194 [inline]
_raw_write_lock_irq+0x32/0x50 kernel/locking/spinlock.c:316
f_modown+0x2a/0x390 fs/fcntl.c:91
generic_add_lease fs/locks.c:1735 [inline]
generic_setlease+0x11bc/0x1a60 fs/locks.c:1814
vfs_setlease+0xfd/0x120 fs/locks.c:1904
do_fcntl_add_lease fs/locks.c:1925 [inline]
fcntl_setlease+0x134/0x2c0 fs/locks.c:1947
do_fcntl+0x2b6/0x1210 fs/fcntl.c:419
__do_sys_fcntl fs/fcntl.c:472 [inline]
__se_sys_fcntl fs/fcntl.c:457 [inline]
__x64_sys_fcntl+0x165/0x1e0 fs/fcntl.c:457
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+0x44/0xae
INITIAL READ USE at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__raw_read_lock_irq include/linux/rwlock_api_smp.h:168 [inline]
_raw_read_lock_irq+0x63/0x80 kernel/locking/spinlock.c:244
f_getown+0x23/0x2a0 fs/fcntl.c:154
do_fcntl+0xbd8/0x1210 fs/fcntl.c:389
__do_sys_fcntl fs/fcntl.c:472 [inline]
__se_sys_fcntl fs/fcntl.c:457 [inline]
__x64_sys_fcntl+0x165/0x1e0 fs/fcntl.c:457
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+0x44/0xae
}
... key at: [<ffffffff9031bde0>] __key.5+0x0/0x40
... acquired at:
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
_raw_read_lock_irqsave+0x70/0x90 kernel/locking/spinlock.c:236
send_sigio+0x24/0x380 fs/fcntl.c:796
kill_fasync_rcu fs/fcntl.c:1021 [inline]
kill_fasync fs/fcntl.c:1035 [inline]
kill_fasync+0x1f8/0x470 fs/fcntl.c:1028
pipe_release+0x1ba/0x320 fs/pipe.c:728
__fput+0x286/0x9f0 fs/file_table.c:280
task_work_run+0xdd/0x1a0 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+0x27e/0x290 kernel/entry/common.c:207
__syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae

-> (&new->fa_lock){...-}-{2:2} {
IN-SOFTIRQ-R at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
_raw_read_lock_irqsave+0x45/0x90 kernel/locking/spinlock.c:236
kill_fasync_rcu fs/fcntl.c:1014 [inline]
kill_fasync fs/fcntl.c:1035 [inline]
kill_fasync+0x136/0x470 fs/fcntl.c:1028
sock_wake_async+0xd2/0x160 net/socket.c:1368
sk_wake_async include/net/sock.h:2400 [inline]
sk_wake_async include/net/sock.h:2396 [inline]
sock_def_readable+0x349/0x4e0 net/core/sock.c:3138
tcp_data_ready+0x106/0x540 net/ipv4/tcp_input.c:4977
tcp_data_queue+0x23c7/0x4b90 net/ipv4/tcp_input.c:5047
tcp_rcv_established+0x8ad/0x2130 net/ipv4/tcp_input.c:5945
tcp_v4_do_rcv+0x600/0x8d0 net/ipv4/tcp_ipv4.c:1716
tcp_v4_rcv+0x2768/0x3080 net/ipv4/tcp_ipv4.c:2110
ip_protocol_deliver_rcu+0xa7/0xee0 net/ipv4/ip_input.c:204
ip_local_deliver_finish+0x20a/0x370 net/ipv4/ip_input.c:231
NF_HOOK include/linux/netfilter.h:307 [inline]
NF_HOOK include/linux/netfilter.h:301 [inline]
ip_local_deliver+0x1b3/0x200 net/ipv4/ip_input.c:252
dst_input include/net/dst.h:460 [inline]
ip_rcv_finish+0x1da/0x2f0 net/ipv4/ip_input.c:429
NF_HOOK include/linux/netfilter.h:307 [inline]
NF_HOOK include/linux/netfilter.h:301 [inline]
ip_rcv+0xaa/0xd0 net/ipv4/ip_input.c:540
__netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5462
__netif_receive_skb+0x24/0x1b0 net/core/dev.c:5576
process_backlog+0x2a5/0x6c0 net/core/dev.c:6452
__napi_poll+0xaf/0x440 net/core/dev.c:7017
napi_poll net/core/dev.c:7084 [inline]
net_rx_action+0x801/0xb40 net/core/dev.c:7171
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
run_ksoftirqd kernel/softirq.c:920 [inline]
run_ksoftirqd+0x2d/0x60 kernel/softirq.c:912
smpboot_thread_fn+0x645/0x9c0 kernel/smpboot.c:164
kthread+0x405/0x4f0 kernel/kthread.c:327
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
INITIAL USE at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__raw_write_lock_irq include/linux/rwlock_api_smp.h:194 [inline]
_raw_write_lock_irq+0x32/0x50 kernel/locking/spinlock.c:316
fasync_insert_entry+0x1d8/0x2b0 fs/fcntl.c:938
lease_setup+0x9d/0x160 fs/locks.c:492
generic_add_lease fs/locks.c:1735 [inline]
generic_setlease+0x11bc/0x1a60 fs/locks.c:1814
vfs_setlease+0xfd/0x120 fs/locks.c:1904
do_fcntl_add_lease fs/locks.c:1925 [inline]
fcntl_setlease+0x134/0x2c0 fs/locks.c:1947
do_fcntl+0x2b6/0x1210 fs/fcntl.c:419
__do_sys_fcntl fs/fcntl.c:472 [inline]
__se_sys_fcntl fs/fcntl.c:457 [inline]
__x64_sys_fcntl+0x165/0x1e0 fs/fcntl.c:457
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+0x44/0xae
INITIAL READ USE at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
_raw_read_lock_irqsave+0x70/0x90 kernel/locking/spinlock.c:236
kill_fasync_rcu fs/fcntl.c:1014 [inline]
kill_fasync fs/fcntl.c:1035 [inline]
kill_fasync+0x136/0x470 fs/fcntl.c:1028
pipe_release+0x1ba/0x320 fs/pipe.c:728
__fput+0x286/0x9f0 fs/file_table.c:280
task_work_run+0xdd/0x1a0 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+0x27e/0x290 kernel/entry/common.c:207
__syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
}
... key at: [<ffffffff9031cbc0>] __key.0+0x0/0x40
... acquired at:
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
_raw_read_lock_irqsave+0x70/0x90 kernel/locking/spinlock.c:236
kill_fasync_rcu fs/fcntl.c:1014 [inline]
kill_fasync fs/fcntl.c:1035 [inline]
kill_fasync+0x136/0x470 fs/fcntl.c:1028
snd_timer_user_ccallback+0x298/0x330 sound/core/timer.c:1387
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:697 [inline]
snd_timer_start sound/core/timer.c:690 [inline]
snd_timer_user_start.isra.0+0x1e3/0x260 sound/core/timer.c:1985
__snd_timer_user_ioctl.isra.0+0xda8/0x2490 sound/core/timer.c:2108
snd_timer_user_ioctl+0x77/0xb0 sound/core/timer.c:2129
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
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+0x44/0xae

stack backtrace:
CPU: 0 PID: 15830 Comm: syz-executor.0 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+0xcd/0x134 lib/dump_stack.c:106
print_bad_irq_dependency kernel/locking/lockdep.c:2577 [inline]
check_irq_usage.cold+0x4c1/0x6b0 kernel/locking/lockdep.c:2816
check_prev_add kernel/locking/lockdep.c:3067 [inline]
check_prevs_add kernel/locking/lockdep.c:3186 [inline]
validate_chain kernel/locking/lockdep.c:3801 [inline]
__lock_acquire+0x2a1f/0x54a0 kernel/locking/lockdep.c:5027
lock_acquire kernel/locking/lockdep.c:5637 [inline]
lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5602
__raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline]
_raw_read_lock_irqsave+0x70/0x90 kernel/locking/spinlock.c:236
kill_fasync_rcu fs/fcntl.c:1014 [inline]
kill_fasync fs/fcntl.c:1035 [inline]
kill_fasync+0x136/0x470 fs/fcntl.c:1028
snd_timer_user_ccallback+0x298/0x330 sound/core/timer.c:1387
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:697 [inline]
snd_timer_start sound/core/timer.c:690 [inline]
snd_timer_user_start.isra.0+0x1e3/0x260 sound/core/timer.c:1985
__snd_timer_user_ioctl.isra.0+0xda8/0x2490 sound/core/timer.c:2108
snd_timer_user_ioctl+0x77/0xb0 sound/core/timer.c:2129
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:874 [inline]
__se_sys_ioctl fs/ioctl.c:860 [inline]
__x64_sys_ioctl+0x193/0x200 fs/ioctl.c:860
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+0x44/0xae
RIP: 0033:0x7fbbeece0ae9
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:00007fbbec214188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fbbeedf40e0 RCX: 00007fbbeece0ae9
RDX: 0000000000000000 RSI: 00000000000054a0 RDI: 0000000000000003
RBP: 00007fbbeed3af6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd7ce4e5ff R14: 00007fbbec214300 R15: 0000000000022000
</TASK>

---
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