===================================================== WARNING: HARDIRQ-safe -> HARDIRQ-unsafe lock order detected 5.19.0-rc1-syzkaller-00011-g9886142c7a22 #0 Not tainted ----------------------------------------------------- syz-executor.1/32217 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire: ffff888076d798a0 (&new->fa_lock){....}-{2:2}, at: kill_fasync_rcu fs/fcntl.c:995 [inline] ffff888076d798a0 (&new->fa_lock){....}-{2:2}, at: kill_fasync fs/fcntl.c:1016 [inline] ffff888076d798a0 (&new->fa_lock){....}-{2:2}, at: kill_fasync+0x136/0x470 fs/fcntl.c:1009 and this task is already holding: ffff88802519e948 (&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 HARDIRQ-irq-safe lock: (&timer->lock){-.-.}-{2:2} ... which became HARDIRQ-irq-safe at: lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:349 [inline] snd_hrtimer_callback+0x4f/0x3c0 sound/core/hrtimer.c:38 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:649 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0x38/0x70 kernel/locking/spinlock.c:194 spin_unlock_irqrestore include/linux/spinlock.h:404 [inline] snd_seq_cell_free+0x20a/0x410 sound/core/seq/seq_memory.c:202 snd_seq_dispatch_event+0x11e/0x580 sound/core/seq/seq_clientmgr.c:916 snd_seq_check_queue+0x173/0x440 sound/core/seq/seq_queue.c:268 snd_seq_enqueue_event+0x1ed/0x3e0 sound/core/seq/seq_queue.c:344 snd_seq_client_enqueue_event.constprop.0+0x230/0x440 sound/core/seq/seq_clientmgr.c:976 snd_seq_kernel_client_enqueue sound/core/seq/seq_clientmgr.c:2298 [inline] snd_seq_kernel_client_enqueue+0x191/0x1e0 sound/core/seq/seq_clientmgr.c:2270 insert_queue sound/core/seq/oss/seq_oss_rw.c:174 [inline] snd_seq_oss_write+0x5d7/0x780 sound/core/seq/oss/seq_oss_rw.c:135 odev_write+0x55/0x90 sound/core/seq/oss/seq_oss.c:168 vfs_write+0x269/0xac0 fs/read_write.c:589 ksys_write+0x127/0x250 fs/read_write.c:644 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+0x46/0xb0 to a HARDIRQ-irq-unsafe lock: (tasklist_lock){.+.?}-{2:2} ... which became HARDIRQ-irq-unsafe at: ... lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __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:302 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); lock(&timer->lock); *** DEADLOCK *** 3 locks held by syz-executor.1/32217: #0: ffff88802028bd68 (&tu->ioctl_lock){+.+.}-{3:3}, at: snd_timer_user_ioctl+0x4c/0xb0 sound/core/timer.c:2127 #1: ffff88802519e948 (&timer->lock){-.-.}-{2:2}, at: snd_timer_start1+0x5a/0x800 sound/core/timer.c:541 #2: ffffffff8bd866e0 (rcu_read_lock){....}-{1:2}, at: kill_fasync+0x41/0x470 fs/fcntl.c:1014 the dependencies between HARDIRQ-irq-safe lock and the holding lock: -> (&timer->lock){-.-.}-{2:2} { IN-HARDIRQ-W at: lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:349 [inline] snd_hrtimer_callback+0x4f/0x3c0 sound/core/hrtimer.c:38 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x609/0xe50 kernel/time/hrtimer.c:1749 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline] __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1112 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1106 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:649 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0x38/0x70 kernel/locking/spinlock.c:194 spin_unlock_irqrestore include/linux/spinlock.h:404 [inline] snd_seq_cell_free+0x20a/0x410 sound/core/seq/seq_memory.c:202 snd_seq_dispatch_event+0x11e/0x580 sound/core/seq/seq_clientmgr.c:916 snd_seq_check_queue+0x173/0x440 sound/core/seq/seq_queue.c:268 snd_seq_enqueue_event+0x1ed/0x3e0 sound/core/seq/seq_queue.c:344 snd_seq_client_enqueue_event.constprop.0+0x230/0x440 sound/core/seq/seq_clientmgr.c:976 snd_seq_kernel_client_enqueue sound/core/seq/seq_clientmgr.c:2298 [inline] snd_seq_kernel_client_enqueue+0x191/0x1e0 sound/core/seq/seq_clientmgr.c:2270 insert_queue sound/core/seq/oss/seq_oss_rw.c:174 [inline] snd_seq_oss_write+0x5d7/0x780 sound/core/seq/oss/seq_oss_rw.c:135 odev_write+0x55/0x90 sound/core/seq/oss/seq_oss.c:168 vfs_write+0x269/0xac0 fs/read_write.c:589 ksys_write+0x127/0x250 fs/read_write.c:644 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+0x46/0xb0 IN-SOFTIRQ-W at: lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __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 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: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+0x1b/0x20 arch/x86/include/asm/idtentry.h:649 lock_acquire+0x1ef/0x570 kernel/locking/lockdep.c:5633 down_read+0x98/0x440 kernel/locking/rwsem.c:1489 kernfs_dop_revalidate+0xec/0x600 fs/kernfs/dir.c:1098 d_revalidate fs/namei.c:848 [inline] d_revalidate fs/namei.c:845 [inline] lookup_fast+0x385/0x6d0 fs/namei.c:1662 walk_component+0xcf/0x6a0 fs/namei.c:2010 link_path_walk.part.0+0x7ef/0xf70 fs/namei.c:2341 link_path_walk fs/namei.c:2266 [inline] path_openat+0x260/0x2910 fs/namei.c:3649 do_filp_open+0x1aa/0x400 fs/namei.c:3680 do_sys_openat2+0x16d/0x4c0 fs/open.c:1278 do_sys_open fs/open.c:1294 [inline] __do_sys_openat fs/open.c:1310 [inline] __se_sys_openat fs/open.c:1305 [inline] __x64_sys_openat+0x13f/0x1f0 fs/open.c:1305 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+0x46/0xb0 INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __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+0x14d0/0x1e10 sound/core/pcm_lib.c:2308 snd_pcm_oss_write3+0x103/0x250 sound/core/oss/pcm_oss.c:1253 io_playback_transfer+0x27e/0x330 sound/core/oss/io.c:47 snd_pcm_plug_write_transfer+0x2cd/0x3f0 sound/core/oss/pcm_plugin.c:630 snd_pcm_oss_write2+0x245/0x3f0 sound/core/oss/pcm_oss.c:1385 snd_pcm_oss_sync1+0x187/0x440 sound/core/oss/pcm_oss.c:1627 snd_pcm_oss_sync+0x638/0x800 sound/core/oss/pcm_oss.c:1704 snd_pcm_oss_release+0x276/0x300 sound/core/oss/pcm_oss.c:2590 __fput+0x277/0x9d0 fs/file_table.c:317 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+0x46/0xb0 } ... key at: [] __key.10+0x0/0x40 the dependencies between the lock to be acquired and HARDIRQ-irq-unsafe lock: -> (tasklist_lock){.+.?}-{2:2} { HARDIRQ-ON-R at: lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __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:302 IN-SOFTIRQ-R at: lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x36/0x70 kernel/locking/spinlock.c:228 send_sigurg+0xad/0xaf0 fs/fcntl.c:832 sk_send_sigurg+0x76/0x310 net/core/sock.c:3275 tcp_check_urg net/ipv4/tcp_input.c:5596 [inline] tcp_urg+0x38e/0xb40 net/ipv4/tcp_input.c:5637 tcp_rcv_established+0x81d/0x20e0 net/ipv4/tcp_input.c:5984 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+0x2f9/0x1950 net/ipv6/ip6_input.c:436 ip6_input_finish+0x14c/0x2c0 net/ipv6/ip6_input.c:481 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:490 dst_input include/net/dst.h:461 [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+0x27f/0x3b0 net/ipv6/ip6_input.c:306 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5478 __netif_receive_skb+0x24/0x1b0 net/core/dev.c:5592 process_backlog+0x3a0/0x7c0 net/core/dev.c:5920 __napi_poll+0xb3/0x6e0 net/core/dev.c:6486 napi_poll net/core/dev.c:6553 [inline] net_rx_action+0x9c1/0xd90 net/core/dev.c:6664 __do_softirq+0x29b/0x9c2 kernel/softirq.c:571 run_ksoftirqd kernel/softirq.c:934 [inline] run_ksoftirqd+0x2d/0x60 kernel/softirq.c:926 smpboot_thread_fn+0x645/0x9c0 kernel/smpboot.c:164 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:302 SOFTIRQ-ON-R at: lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __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:302 INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __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+0x445e/0x7020 kernel/fork.c:2374 kernel_clone+0xe7/0xab0 kernel/fork.c:2655 user_mode_thread+0xad/0xe0 kernel/fork.c:2724 rest_init+0x23/0x270 init/main.c:691 arch_call_rest_init+0xf/0x14 init/main.c:882 start_kernel+0x46e/0x48f init/main.c:1137 secondary_startup_64_no_verify+0xce/0xdb INITIAL READ USE at: lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __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:302 } ... key at: [] tasklist_lock+0x18/0x40 ... acquired at: __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:228 send_sigurg+0xad/0xaf0 fs/fcntl.c:832 sk_send_sigurg+0x76/0x310 net/core/sock.c:3275 tcp_check_urg net/ipv4/tcp_input.c:5596 [inline] tcp_urg+0x38e/0xb40 net/ipv4/tcp_input.c:5637 tcp_rcv_established+0x81d/0x20e0 net/ipv4/tcp_input.c:5984 tcp_v6_do_rcv+0x810/0x13c0 net/ipv6/tcp_ipv6.c:1476 sk_backlog_rcv include/net/sock.h:1061 [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+0x46/0xb0 -> (&f->f_owner.lock){...-}-{2:2} { IN-SOFTIRQ-R at: lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __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/0xaf0 fs/fcntl.c:816 sk_send_sigurg+0x76/0x310 net/core/sock.c:3275 tcp_check_urg net/ipv4/tcp_input.c:5596 [inline] tcp_urg+0x38e/0xb40 net/ipv4/tcp_input.c:5637 tcp_rcv_established+0x81d/0x20e0 net/ipv4/tcp_input.c:5984 tcp_v4_do_rcv+0x66c/0x9b0 net/ipv4/tcp_ipv4.c:1659 tcp_v4_rcv+0x2f1c/0x3700 net/ipv4/tcp_ipv4.c:2072 ip_protocol_deliver_rcu+0xa3/0x7c0 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x2e8/0x4c0 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:307 [inline] NF_HOOK include/linux/netfilter.h:301 [inline] ip_local_deliver+0x1aa/0x200 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:461 [inline] ip_rcv_finish+0x1cb/0x2f0 net/ipv4/ip_input.c:437 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:557 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5478 __netif_receive_skb+0x24/0x1b0 net/core/dev.c:5592 process_backlog+0x3a0/0x7c0 net/core/dev.c:5920 __napi_poll+0xb3/0x6e0 net/core/dev.c:6486 napi_poll net/core/dev.c:6553 [inline] net_rx_action+0x9c1/0xd90 net/core/dev.c:6664 __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+0x1b/0x20 arch/x86/include/asm/idtentry.h:649 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0x38/0x70 kernel/locking/spinlock.c:194 hrtimer_start_expires include/linux/hrtimer.h:432 [inline] hrtimer_sleeper_start_expires kernel/time/hrtimer.c:1965 [inline] do_nanosleep+0x1e8/0x690 kernel/time/hrtimer.c:2041 hrtimer_nanosleep+0x1f9/0x4a0 kernel/time/hrtimer.c:2097 common_nsleep+0xa2/0xc0 kernel/time/posix-timers.c:1227 __do_sys_clock_nanosleep kernel/time/posix-timers.c:1267 [inline] __se_sys_clock_nanosleep kernel/time/posix-timers.c:1245 [inline] __x64_sys_clock_nanosleep+0x2f4/0x430 kernel/time/posix-timers.c:1245 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+0x46/0xb0 INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __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 __tty_fasync drivers/tty/tty_io.c:2244 [inline] tty_fasync+0x295/0x390 drivers/tty/tty_io.c:2259 setfl fs/fcntl.c:73 [inline] do_fcntl+0x5ea/0x1040 fs/fcntl.c:339 __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+0x46/0xb0 INITIAL READ USE at: lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0x70/0x90 kernel/locking/spinlock.c:236 send_sigurg+0x1e/0xaf0 fs/fcntl.c:816 sk_send_sigurg+0x76/0x310 net/core/sock.c:3275 tcp_check_urg net/ipv4/tcp_input.c:5596 [inline] tcp_urg+0x38e/0xb40 net/ipv4/tcp_input.c:5637 tcp_rcv_established+0x81d/0x20e0 net/ipv4/tcp_input.c:5984 tcp_v4_do_rcv+0x66c/0x9b0 net/ipv4/tcp_ipv4.c:1659 sk_backlog_rcv include/net/sock.h:1061 [inline] __release_sock+0x134/0x3b0 net/core/sock.c:2849 release_sock+0x54/0x1b0 net/core/sock.c:3404 sk_stream_wait_memory+0x608/0xed0 net/core/stream.c:145 tcp_sendmsg_locked+0x7d5/0x2fc0 net/ipv4/tcp.c:1410 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1448 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:819 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 __sys_sendto+0x21a/0x320 net/socket.c:2119 __do_sys_sendto net/socket.c:2131 [inline] __se_sys_sendto net/socket.c:2127 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2127 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+0x46/0xb0 } ... key at: [] __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+0x24/0x380 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 sock_wake_async+0xd2/0x160 net/socket.c:1419 sk_wake_async include/net/sock.h:2480 [inline] sk_wake_async include/net/sock.h:2476 [inline] sock_def_readable+0x349/0x4e0 net/core/sock.c:3219 unix_dgram_sendmsg+0xf69/0x1ad0 net/unix/af_unix.c:2028 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 ____sys_sendmsg+0x334/0x810 net/socket.c:2492 ___sys_sendmsg+0xf3/0x170 net/socket.c:2546 __sys_sendmmsg+0x195/0x470 net/socket.c:2632 __do_sys_sendmmsg net/socket.c:2661 [inline] __se_sys_sendmmsg net/socket.c:2658 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2658 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+0x46/0xb0 -> (&new->fa_lock){....}-{2:2} { INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __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 __tty_fasync drivers/tty/tty_io.c:2226 [inline] __tty_hangup.part.0+0x2df/0x830 drivers/tty/tty_io.c:627 __tty_hangup drivers/tty/tty_io.c:592 [inline] tty_vhangup+0x1d/0x30 drivers/tty/tty_io.c:707 pty_close+0x39f/0x4f0 drivers/tty/pty.c:79 tty_release+0x45e/0x1200 drivers/tty/tty_io.c:1758 __fput+0x277/0x9d0 fs/file_table.c:317 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+0x46/0xb0 INITIAL READ USE at: lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __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 sock_wake_async+0xd2/0x160 net/socket.c:1419 sk_wake_async include/net/sock.h:2480 [inline] sk_wake_async include/net/sock.h:2476 [inline] sock_def_readable+0x349/0x4e0 net/core/sock.c:3219 unix_dgram_sendmsg+0xf69/0x1ad0 net/unix/af_unix.c:2028 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 ____sys_sendmsg+0x334/0x810 net/socket.c:2492 ___sys_sendmsg+0xf3/0x170 net/socket.c:2546 __sys_sendmmsg+0x195/0x470 net/socket.c:2632 __do_sys_sendmmsg net/socket.c:2661 [inline] __se_sys_sendmmsg net/socket.c:2658 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2658 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+0x46/0xb0 } ... key at: [] __key.0+0x0/0x40 ... acquired at: lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __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+0x46/0xb0 stack backtrace: CPU: 0 PID: 32217 Comm: syz-executor.1 Not tainted 5.19.0-rc1-syzkaller-00011-g9886142c7a22 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __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+0x2ad6/0x5660 kernel/locking/lockdep.c:5053 lock_acquire kernel/locking/lockdep.c:5665 [inline] lock_acquire+0x1ab/0x570 kernel/locking/lockdep.c:5630 __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+0x46/0xb0 RIP: 0033:0x7ff8b4889109 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:00007ff8b5977168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007ff8b499bf60 RCX: 00007ff8b4889109 RDX: 0000000000000000 RSI: 00000000000054a0 RDI: 0000000000000003 RBP: 00007ff8b48e30ad R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff8b4ecfb1f R14: 00007ff8b5977300 R15: 0000000000022000