===================================================== WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected 5.15.0-syzkaller #0 Not tainted ----------------------------------------------------- syz-executor.2/22489 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire: ffffffff8b60a098 (tasklist_lock){.+.+}-{2:2}, at: send_sigio+0xab/0x380 fs/fcntl.c:810 and this task is already holding: ffff8880189057b8 (&f->f_owner.lock){...-}-{2:2}, at: send_sigio+0x24/0x380 fs/fcntl.c:796 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: (&group->lock){..-.}-{2:2} ... which became SOFTIRQ-irq-safe at: lock_acquire kernel/locking/lockdep.c:5640 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5605 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 _snd_pcm_stream_lock_irqsave+0x9f/0xd0 sound/core/pcm_native.c:170 snd_pcm_period_elapsed+0x1d/0x50 sound/core/pcm_lib.c:1848 loopback_jiffies_timer_function+0x1c4/0x240 sound/drivers/aloop.c:668 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1466 [inline] __run_timers.part.0+0x675/0xa20 kernel/time/timer.c:1734 __run_timers kernel/time/timer.c:1715 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747 __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 to a SOFTIRQ-irq-unsafe lock: (tasklist_lock){.+.+}-{2:2} ... which became SOFTIRQ-irq-unsafe at: ... lock_acquire kernel/locking/lockdep.c:5640 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5605 __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: &group->lock --> &f->f_owner.lock --> tasklist_lock Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(tasklist_lock); local_irq_disable(); lock(&group->lock); lock(&f->f_owner.lock); lock(&group->lock); *** DEADLOCK *** 5 locks held by syz-executor.2/22489: #0: ffffffff8b983a20 (rcu_read_lock){....}-{1:2}, at: sock_def_readable+0x0/0x4e0 include/trace/events/sock.h:204 #1: ffffffff8b983a20 (rcu_read_lock){....}-{1:2}, at: rcu_read_unlock include/linux/rcupdate.h:717 [inline] #1: ffffffff8b983a20 (rcu_read_lock){....}-{1:2}, at: sock_def_readable+0x2aa/0x4e0 net/core/sock.c:3139 #2: ffffffff8b983a20 (rcu_read_lock){....}-{1:2}, at: kill_fasync+0x41/0x470 fs/fcntl.c:1033 #3: ffff88807d8387f8 (&new->fa_lock){....}-{2:2}, at: kill_fasync_rcu fs/fcntl.c:1014 [inline] #3: ffff88807d8387f8 (&new->fa_lock){....}-{2:2}, at: kill_fasync fs/fcntl.c:1035 [inline] #3: ffff88807d8387f8 (&new->fa_lock){....}-{2:2}, at: kill_fasync+0x136/0x470 fs/fcntl.c:1028 #4: ffff8880189057b8 (&f->f_owner.lock){...-}-{2:2}, at: send_sigio+0x24/0x380 fs/fcntl.c:796 the dependencies between SOFTIRQ-irq-safe lock and the holding lock: -> (&group->lock){..-.}-{2:2} { IN-SOFTIRQ-W at: lock_acquire kernel/locking/lockdep.c:5640 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5605 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x39/0x50 kernel/locking/spinlock.c:162 _snd_pcm_stream_lock_irqsave+0x9f/0xd0 sound/core/pcm_native.c:170 snd_pcm_period_elapsed+0x1d/0x50 sound/core/pcm_lib.c:1848 loopback_jiffies_timer_function+0x1c4/0x240 sound/drivers/aloop.c:668 call_timer_fn+0x1a5/0x6b0 kernel/time/timer.c:1421 expire_timers kernel/time/timer.c:1466 [inline] __run_timers.part.0+0x675/0xa20 kernel/time/timer.c:1734 __run_timers kernel/time/timer.c:1715 [inline] run_timer_softirq+0xb3/0x1d0 kernel/time/timer.c:1747 __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:5640 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5605 __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: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+0x12a/0x1990 sound/core/pcm_native.c:686 snd_pcm_kernel_ioctl+0x164/0x310 sound/core/pcm_native.c:3372 snd_pcm_oss_change_params_locked+0x1936/0x3a60 sound/core/oss/pcm_oss.c:947 snd_pcm_oss_change_params sound/core/oss/pcm_oss.c:1091 [inline] snd_pcm_oss_get_active_substream+0x164/0x1c0 sound/core/oss/pcm_oss.c:1108 snd_pcm_oss_get_rate sound/core/oss/pcm_oss.c:1765 [inline] snd_pcm_oss_set_rate sound/core/oss/pcm_oss.c:1757 [inline] snd_pcm_oss_ioctl+0x144f/0x3430 sound/core/oss/pcm_oss.c:2619 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 } ... key at: [] __key.9+0x0/0x40 -> (&timer->lock){....}-{2:2} { INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5640 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5605 __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:375 [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: [] __key.12+0x0/0x40 ... acquired at: __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_start+0x24a/0x310 sound/core/pcm_native.c:1392 snd_pcm_action_single sound/core/pcm_native.c:1229 [inline] snd_pcm_action+0x143/0x170 sound/core/pcm_native.c:1310 __snd_pcm_lib_xfer+0x1289/0x1d80 sound/core/pcm_lib.c:2286 snd_pcm_oss_write3+0x103/0x250 sound/core/oss/pcm_oss.c:1228 io_playback_transfer+0x27e/0x330 sound/core/oss/io.c:47 snd_pcm_plug_write_transfer+0x2cd/0x3f0 sound/core/oss/pcm_plugin.c:627 snd_pcm_oss_write2+0x245/0x3f0 sound/core/oss/pcm_oss.c:1360 snd_pcm_oss_write1 sound/core/oss/pcm_oss.c:1426 [inline] snd_pcm_oss_write+0x75f/0x9c0 sound/core/oss/pcm_oss.c:2792 vfs_write+0x28e/0xae0 fs/read_write.c:588 ksys_write+0x12d/0x250 fs/read_write.c:643 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 -> (&new->fa_lock){....}-{2:2} { INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5640 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5605 __raw_write_lock_irq include/linux/rwlock_api_smp.h:194 [inline] _raw_write_lock_irq+0x32/0x50 kernel/locking/spinlock.c:316 fasync_remove_entry+0xb6/0x1f0 fs/fcntl.c:891 fasync_helper+0x9e/0xb0 fs/fcntl.c:994 vcs_fasync+0x57/0xb0 drivers/tty/vt/vc_screen.c:741 __fput+0x846/0x9f0 fs/file_table.c:277 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 INITIAL READ USE at: lock_acquire kernel/locking/lockdep.c:5640 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5605 __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 vcs_notifier+0x159/0x1f0 drivers/tty/vt/vc_screen.c:114 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 atomic_notifier_call_chain+0x70/0x180 kernel/notifier.c:198 notify_update drivers/tty/vt/vt.c:270 [inline] do_con_write+0xc67/0x1e40 drivers/tty/vt/vt.c:2964 con_write+0x21/0x40 drivers/tty/vt/vt.c:3295 process_output_block drivers/tty/n_tty.c:592 [inline] n_tty_write+0x410/0xfd0 drivers/tty/n_tty.c:2288 do_tty_write drivers/tty/tty_io.c:1038 [inline] file_tty_write.constprop.0+0x526/0x910 drivers/tty/tty_io.c:1110 call_write_iter include/linux/fs.h:2162 [inline] do_iter_readv_writev+0x472/0x750 fs/read_write.c:725 do_iter_write+0x188/0x710 fs/read_write.c:851 vfs_iter_write+0x70/0xa0 fs/read_write.c:892 iter_file_splice_write+0x723/0xc70 fs/splice.c:689 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0x110/0x180 fs/splice.c:936 splice_direct_to_actor+0x34b/0x8c0 fs/splice.c:891 do_splice_direct+0x1b3/0x280 fs/splice.c:979 do_sendfile+0xaf2/0x1250 fs/read_write.c:1245 __do_sys_sendfile64 fs/read_write.c:1310 [inline] __se_sys_sendfile64 fs/read_write.c:1296 [inline] __x64_sys_sendfile64+0x1cc/0x210 fs/read_write.c:1296 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: [] __key.0+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 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 -> (&f->f_owner.lock){...-}-{2:2} { IN-SOFTIRQ-R at: lock_acquire kernel/locking/lockdep.c:5640 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5605 __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_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:5640 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5605 __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 fcntl_dirnotify+0x7c9/0xbc0 fs/notify/dnotify/dnotify.c:351 do_fcntl+0x269/0x1210 fs/fcntl.c:422 __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:5640 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5605 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:159 [inline] _raw_read_lock_irqsave+0x70/0x90 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_v4_do_rcv+0x600/0x8d0 net/ipv4/tcp_ipv4.c:1716 sk_backlog_rcv include/net/sock.h:1030 [inline] __release_sock+0x134/0x3b0 net/core/sock.c:2768 release_sock+0x54/0x1b0 net/core/sock.c:3300 sk_stream_wait_memory+0x604/0xed0 net/core/stream.c:145 tcp_sendmsg_locked+0x7c1/0x2c60 net/ipv4/tcp.c:1384 tcp_sendmsg+0x2b/0x40 net/ipv4/tcp.c:1422 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:819 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 __sys_sendto+0x21c/0x320 net/socket.c:2036 __do_sys_sendto net/socket.c:2048 [inline] __se_sys_sendto net/socket.c:2044 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2044 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: [] __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 vcs_notifier+0x159/0x1f0 drivers/tty/vt/vc_screen.c:114 notifier_call_chain+0xb5/0x200 kernel/notifier.c:83 atomic_notifier_call_chain+0x70/0x180 kernel/notifier.c:198 notify_update drivers/tty/vt/vt.c:270 [inline] do_con_write+0xc67/0x1e40 drivers/tty/vt/vt.c:2964 con_write+0x21/0x40 drivers/tty/vt/vt.c:3295 process_output_block drivers/tty/n_tty.c:592 [inline] n_tty_write+0x410/0xfd0 drivers/tty/n_tty.c:2288 do_tty_write drivers/tty/tty_io.c:1038 [inline] file_tty_write.constprop.0+0x526/0x910 drivers/tty/tty_io.c:1110 call_write_iter include/linux/fs.h:2162 [inline] do_iter_readv_writev+0x472/0x750 fs/read_write.c:725 do_iter_write+0x188/0x710 fs/read_write.c:851 vfs_iter_write+0x70/0xa0 fs/read_write.c:892 iter_file_splice_write+0x723/0xc70 fs/splice.c:689 do_splice_from fs/splice.c:767 [inline] direct_splice_actor+0x110/0x180 fs/splice.c:936 splice_direct_to_actor+0x34b/0x8c0 fs/splice.c:891 do_splice_direct+0x1b3/0x280 fs/splice.c:979 do_sendfile+0xaf2/0x1250 fs/read_write.c:1245 __do_sys_sendfile64 fs/read_write.c:1310 [inline] __se_sys_sendfile64 fs/read_write.c:1296 [inline] __x64_sys_sendfile64+0x1cc/0x210 fs/read_write.c:1296 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 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:5640 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5605 __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:5640 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5605 __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:5640 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5605 __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:1133 secondary_startup_64_no_verify+0xb0/0xbb INITIAL READ USE at: lock_acquire kernel/locking/lockdep.c:5640 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5605 __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: [] tasklist_lock+0x18/0x40 ... acquired at: lock_acquire kernel/locking/lockdep.c:5640 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5605 __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 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 unix_dgram_sendmsg+0xfa7/0x1950 net/unix/af_unix.c:1941 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 ____sys_sendmsg+0x331/0x810 net/socket.c:2409 ___sys_sendmsg+0xf3/0x170 net/socket.c:2463 __sys_sendmmsg+0x195/0x470 net/socket.c:2549 __do_sys_sendmmsg net/socket.c:2578 [inline] __se_sys_sendmmsg net/socket.c:2575 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2575 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: 1 PID: 22489 Comm: syz-executor.2 Not tainted 5.15.0-syzkaller #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:2580 [inline] check_irq_usage.cold+0x4c1/0x6b0 kernel/locking/lockdep.c:2819 check_prev_add kernel/locking/lockdep.c:3070 [inline] check_prevs_add kernel/locking/lockdep.c:3189 [inline] validate_chain kernel/locking/lockdep.c:3804 [inline] __lock_acquire+0x2a1f/0x54a0 kernel/locking/lockdep.c:5030 lock_acquire kernel/locking/lockdep.c:5640 [inline] lock_acquire+0x1ab/0x510 kernel/locking/lockdep.c:5605 __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 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 unix_dgram_sendmsg+0xfa7/0x1950 net/unix/af_unix.c:1941 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 ____sys_sendmsg+0x331/0x810 net/socket.c:2409 ___sys_sendmsg+0xf3/0x170 net/socket.c:2463 __sys_sendmmsg+0x195/0x470 net/socket.c:2549 __do_sys_sendmmsg net/socket.c:2578 [inline] __se_sys_sendmmsg net/socket.c:2575 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2575 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: 0033:0x7f68b7b44ae9 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:00007f68b50ba188 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007f68b7c57f60 RCX: 00007f68b7b44ae9 RDX: 0307017fdb7a66cb RSI: 0000000020002dc0 RDI: 0000000000000006 RBP: 00007f68b7b9ef25 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000003ec0 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc56708d5f R14: 00007f68b50ba300 R15: 0000000000022000