===================================================== WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected 6.11.0-rc6-syzkaller-00355-g5dadc1be8fc5 #0 Not tainted ----------------------------------------------------- syz.1.11420/31917 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire: ffffffff8da0a098 (tasklist_lock){.+.+}-{2:2}, at: send_sigurg+0xb0/0xc30 fs/fcntl.c:871 and this task is already holding: ffff88802daa0898 (&f->f_owner.lock){...-}-{2:2}, at: send_sigurg+0x22/0xc30 fs/fcntl.c:855 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: (&dev->event_lock#2){..-.}-{2:2} ... which became SOFTIRQ-irq-safe at: lock_acquire kernel/locking/lockdep.c:5759 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5724 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 input_inject_event+0xa4/0x370 drivers/input/input.c:423 __led_set_brightness drivers/leds/led-core.c:52 [inline] led_set_brightness_nopm drivers/leds/led-core.c:323 [inline] led_set_brightness_nosleep drivers/leds/led-core.c:354 [inline] led_set_brightness+0x211/0x290 drivers/leds/led-core.c:316 led_trigger_event drivers/leds/led-triggers.c:407 [inline] led_trigger_event+0xda/0x270 drivers/leds/led-triggers.c:395 kbd_propagate_led_state drivers/tty/vt/keyboard.c:1080 [inline] kbd_bh+0x21b/0x300 drivers/tty/vt/keyboard.c:1269 tasklet_action_common.constprop.0+0x24c/0x3e0 kernel/softirq.c:785 handle_softirqs+0x216/0x8f0 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu kernel/softirq.c:637 [inline] irq_exit_rcu+0xbb/0x120 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] _raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194 csi_ECMA drivers/tty/vt/vt.c:2516 [inline] do_con_trol drivers/tty/vt/vt.c:2657 [inline] do_con_write+0x3e8e/0x7bb0 drivers/tty/vt/vt.c:3092 con_write+0x23/0xb0 drivers/tty/vt/vt.c:3434 process_output_block drivers/tty/n_tty.c:574 [inline] n_tty_write+0x423/0x1150 drivers/tty/n_tty.c:2389 iterate_tty_write drivers/tty/tty_io.c:1021 [inline] file_tty_write.constprop.0+0x518/0x9b0 drivers/tty/tty_io.c:1096 new_sync_write fs/read_write.c:497 [inline] vfs_write+0x6b6/0x1140 fs/read_write.c:590 ksys_write+0x12f/0x260 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f to a SOFTIRQ-irq-unsafe lock: (tasklist_lock){.+.+}-{2:2} ... which became SOFTIRQ-irq-unsafe at: ... lock_acquire kernel/locking/lockdep.c:5759 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5724 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228 __do_wait+0x105/0x890 kernel/exit.c:1591 do_wait+0x219/0x570 kernel/exit.c:1635 kernel_wait+0xa0/0x160 kernel/exit.c:1811 call_usermodehelper_exec_sync kernel/umh.c:137 [inline] call_usermodehelper_exec_work+0xf1/0x170 kernel/umh.c:164 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xed0 kernel/workqueue.c:3389 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 other info that might help us debug this: Chain exists of: &dev->event_lock#2 --> &f->f_owner.lock --> tasklist_lock Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(tasklist_lock); local_irq_disable(); lock(&dev->event_lock#2); lock(&f->f_owner.lock); lock(&dev->event_lock#2); *** DEADLOCK *** 2 locks held by syz.1.11420/31917: #0: ffff88802070d668 (&u->lock){+.+.}-{2:2}, at: spin_lock include/linux/spinlock.h:351 [inline] #0: ffff88802070d668 (&u->lock){+.+.}-{2:2}, at: queue_oob net/unix/af_unix.c:2219 [inline] #0: ffff88802070d668 (&u->lock){+.+.}-{2:2}, at: unix_stream_sendmsg+0xbbb/0x10f0 net/unix/af_unix.c:2358 #1: ffff88802daa0898 (&f->f_owner.lock){...-}-{2:2}, at: send_sigurg+0x22/0xc30 fs/fcntl.c:855 the dependencies between SOFTIRQ-irq-safe lock and the holding lock: -> (&dev->event_lock#2){..-.}-{2:2} { IN-SOFTIRQ-W at: lock_acquire kernel/locking/lockdep.c:5759 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5724 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 input_inject_event+0xa4/0x370 drivers/input/input.c:423 __led_set_brightness drivers/leds/led-core.c:52 [inline] led_set_brightness_nopm drivers/leds/led-core.c:323 [inline] led_set_brightness_nosleep drivers/leds/led-core.c:354 [inline] led_set_brightness+0x211/0x290 drivers/leds/led-core.c:316 led_trigger_event drivers/leds/led-triggers.c:407 [inline] led_trigger_event+0xda/0x270 drivers/leds/led-triggers.c:395 kbd_propagate_led_state drivers/tty/vt/keyboard.c:1080 [inline] kbd_bh+0x21b/0x300 drivers/tty/vt/keyboard.c:1269 tasklet_action_common.constprop.0+0x24c/0x3e0 kernel/softirq.c:785 handle_softirqs+0x216/0x8f0 kernel/softirq.c:554 __do_softirq kernel/softirq.c:588 [inline] invoke_softirq kernel/softirq.c:428 [inline] __irq_exit_rcu kernel/softirq.c:637 [inline] irq_exit_rcu+0xbb/0x120 kernel/softirq.c:649 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline] sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1043 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] _raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194 csi_ECMA drivers/tty/vt/vt.c:2516 [inline] do_con_trol drivers/tty/vt/vt.c:2657 [inline] do_con_write+0x3e8e/0x7bb0 drivers/tty/vt/vt.c:3092 con_write+0x23/0xb0 drivers/tty/vt/vt.c:3434 process_output_block drivers/tty/n_tty.c:574 [inline] n_tty_write+0x423/0x1150 drivers/tty/n_tty.c:2389 iterate_tty_write drivers/tty/tty_io.c:1021 [inline] file_tty_write.constprop.0+0x518/0x9b0 drivers/tty/tty_io.c:1096 new_sync_write fs/read_write.c:497 [inline] vfs_write+0x6b6/0x1140 fs/read_write.c:590 ksys_write+0x12f/0x260 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5759 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5724 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162 input_inject_event+0xa4/0x370 drivers/input/input.c:423 __led_set_brightness drivers/leds/led-core.c:52 [inline] led_set_brightness_nopm drivers/leds/led-core.c:323 [inline] led_set_brightness_nosleep drivers/leds/led-core.c:354 [inline] led_set_brightness+0x211/0x290 drivers/leds/led-core.c:316 kbd_led_trigger_activate+0xcb/0x110 drivers/tty/vt/keyboard.c:1036 led_trigger_set+0x59a/0xc60 drivers/leds/led-triggers.c:212 led_match_default_trigger drivers/leds/led-triggers.c:269 [inline] led_match_default_trigger drivers/leds/led-triggers.c:263 [inline] led_trigger_set_default drivers/leds/led-triggers.c:287 [inline] led_trigger_set_default+0x1bd/0x2a0 drivers/leds/led-triggers.c:276 led_classdev_register_ext+0x78c/0x9e0 drivers/leds/led-class.c:555 led_classdev_register include/linux/leds.h:273 [inline] input_leds_connect+0x54a/0x8e0 drivers/input/input-leds.c:145 input_attach_handler.isra.0+0x181/0x260 drivers/input/input.c:1027 input_register_device+0xa8e/0x1140 drivers/input/input.c:2473 atkbd_connect+0x5e2/0xa20 drivers/input/keyboard/atkbd.c:1342 serio_connect_driver drivers/input/serio/serio.c:44 [inline] serio_driver_probe+0x74/0xa0 drivers/input/serio/serio.c:775 call_driver_probe drivers/base/dd.c:578 [inline] really_probe+0x23e/0xa90 drivers/base/dd.c:657 __driver_probe_device+0x1de/0x440 drivers/base/dd.c:799 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:829 __driver_attach+0x283/0x580 drivers/base/dd.c:1215 bus_for_each_dev+0x13c/0x1d0 drivers/base/bus.c:368 serio_attach_driver drivers/input/serio/serio.c:804 [inline] serio_handle_event+0x2bb/0xa90 drivers/input/serio/serio.c:224 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xed0 kernel/workqueue.c:3389 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 } ... key at: [] __key.7+0x0/0x40 -> (&client->buffer_lock){....}-{2:2} { INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5759 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5724 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] evdev_pass_values+0x10e/0x9b0 drivers/input/evdev.c:261 evdev_events+0x1bb/0x390 drivers/input/evdev.c:306 input_pass_values+0x777/0x8e0 drivers/input/input.c:126 input_event_dispose drivers/input/input.c:341 [inline] input_handle_event+0xf0b/0x14d0 drivers/input/input.c:369 input_inject_event+0x1bb/0x370 drivers/input/input.c:428 evdev_write+0x450/0x750 drivers/input/evdev.c:521 vfs_write+0x29a/0x1140 fs/read_write.c:588 ksys_write+0x1f8/0x260 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f } ... key at: [] __key.1+0x0/0x40 ... acquired at: __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] evdev_pass_values+0x10e/0x9b0 drivers/input/evdev.c:261 evdev_events+0x1bb/0x390 drivers/input/evdev.c:306 input_pass_values+0x777/0x8e0 drivers/input/input.c:126 input_event_dispose drivers/input/input.c:341 [inline] input_handle_event+0xf0b/0x14d0 drivers/input/input.c:369 input_inject_event+0x1bb/0x370 drivers/input/input.c:428 evdev_write+0x450/0x750 drivers/input/evdev.c:521 vfs_write+0x29a/0x1140 fs/read_write.c:588 ksys_write+0x1f8/0x260 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> (&new->fa_lock){....}-{2:2} { INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5759 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5724 __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline] _raw_write_lock_irq+0x36/0x50 kernel/locking/spinlock.c:326 fasync_remove_entry+0xb9/0x1f0 fs/fcntl.c:905 fasync_helper+0xaf/0xd0 fs/fcntl.c:1008 __fput+0x94a/0xbb0 fs/file_table.c:419 task_work_run+0x14e/0x250 kernel/task_work.c:228 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f INITIAL READ USE at: lock_acquire kernel/locking/lockdep.c:5759 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5724 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0x74/0x90 kernel/locking/spinlock.c:236 kill_fasync_rcu fs/fcntl.c:1028 [inline] kill_fasync fs/fcntl.c:1049 [inline] kill_fasync+0x138/0x4f0 fs/fcntl.c:1042 sock_wake_async+0x132/0x160 net/socket.c:1475 sk_wake_async include/net/sock.h:2440 [inline] sk_wake_async include/net/sock.h:2436 [inline] unix_shutdown+0x4be/0xa50 net/unix/af_unix.c:3088 __sys_shutdown_sock net/socket.c:2438 [inline] __sys_shutdown_sock net/socket.c:2432 [inline] __sys_shutdown+0xff/0x1c0 net/socket.c:2450 __do_sys_shutdown net/socket.c:2458 [inline] __se_sys_shutdown net/socket.c:2456 [inline] __x64_sys_shutdown+0x53/0x80 net/socket.c:2456 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f } ... key at: [] __key.0+0x0/0x40 ... acquired at: __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0x74/0x90 kernel/locking/spinlock.c:236 kill_fasync_rcu fs/fcntl.c:1028 [inline] kill_fasync fs/fcntl.c:1049 [inline] kill_fasync+0x138/0x4f0 fs/fcntl.c:1042 __pass_event drivers/input/evdev.c:240 [inline] evdev_pass_values+0x619/0x9b0 drivers/input/evdev.c:278 evdev_events+0x1bb/0x390 drivers/input/evdev.c:306 input_pass_values+0x777/0x8e0 drivers/input/input.c:126 input_event_dispose drivers/input/input.c:341 [inline] input_handle_event+0xf0b/0x14d0 drivers/input/input.c:369 input_inject_event+0x1bb/0x370 drivers/input/input.c:428 evdev_write+0x450/0x750 drivers/input/evdev.c:521 vfs_write+0x29a/0x1140 fs/read_write.c:588 ksys_write+0x1f8/0x260 fs/read_write.c:643 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> (&f->f_owner.lock){...-}-{2:2} { IN-SOFTIRQ-R at: lock_acquire kernel/locking/lockdep.c:5759 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5724 __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0x46/0x90 kernel/locking/spinlock.c:236 send_sigurg+0x22/0xc30 fs/fcntl.c:855 sk_send_sigurg+0x7a/0x370 net/core/sock.c:3432 tcp_check_urg net/ipv4/tcp_input.c:5831 [inline] tcp_urg+0x343/0xb80 net/ipv4/tcp_input.c:5872 tcp_rcv_established+0x8a6/0x21c0 net/ipv4/tcp_input.c:6227 tcp_v4_do_rcv+0x5ca/0xa90 net/ipv4/tcp_ipv4.c:1911 tcp_v4_rcv+0x33a8/0x4390 net/ipv4/tcp_ipv4.c:2346 ip_protocol_deliver_rcu+0xba/0x4c0 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x316/0x570 net/ipv4/ip_input.c:233 NF_HOOK include/linux/netfilter.h:314 [inline] NF_HOOK include/linux/netfilter.h:308 [inline] ip_local_deliver+0x18e/0x1f0 net/ipv4/ip_input.c:254 dst_input include/net/dst.h:460 [inline] ip_rcv_finish net/ipv4/ip_input.c:449 [inline] NF_HOOK include/linux/netfilter.h:314 [inline] NF_HOOK include/linux/netfilter.h:308 [inline] ip_rcv+0x2c5/0x5d0 net/ipv4/ip_input.c:569 __netif_receive_skb_one_core+0x199/0x1e0 net/core/dev.c:5661 __netif_receive_skb+0x1d/0x160 net/core/dev.c:5775 process_backlog+0x443/0x15f0 net/core/dev.c:6108 __napi_poll.constprop.0+0xb7/0x550 net/core/dev.c:6772 napi_poll net/core/dev.c:6841 [inline] net_rx_action+0xa92/0x1010 net/core/dev.c:6963 handle_softirqs+0x216/0x8f0 kernel/softirq.c:554 do_softirq kernel/softirq.c:455 [inline] do_softirq+0xb2/0xf0 kernel/softirq.c:442 __local_bh_enable_ip+0x100/0x120 kernel/softirq.c:382 sk_stream_wait_memory+0x65e/0x10e0 net/core/stream.c:145 tcp_sendmsg_locked+0xa7c/0x3550 net/ipv4/tcp.c:1312 tcp_sendmsg+0x2e/0x50 net/ipv4/tcp.c:1354 inet_sendmsg+0xb9/0x140 net/ipv4/af_inet.c:853 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] __sys_sendto+0x42c/0x4e0 net/socket.c:2204 __do_sys_sendto net/socket.c:2216 [inline] __se_sys_sendto net/socket.c:2212 [inline] __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2212 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5759 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5724 __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline] _raw_write_lock_irq+0x36/0x50 kernel/locking/spinlock.c:326 f_modown+0x2a/0x380 fs/fcntl.c:93 __f_setown fs/fcntl.c:112 [inline] f_setown_ex fs/fcntl.c:202 [inline] do_fcntl+0x69d/0x1380 fs/fcntl.c:418 __do_sys_fcntl fs/fcntl.c:492 [inline] __se_sys_fcntl fs/fcntl.c:477 [inline] __x64_sys_fcntl+0x174/0x200 fs/fcntl.c:477 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f INITIAL READ USE at: lock_acquire kernel/locking/lockdep.c:5759 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5724 __raw_read_lock_irq include/linux/rwlock_api_smp.h:169 [inline] _raw_read_lock_irq+0x67/0x80 kernel/locking/spinlock.c:244 f_getowner_uids fs/fcntl.c:255 [inline] do_fcntl+0x4b7/0x1380 fs/fcntl.c:421 __do_sys_fcntl fs/fcntl.c:492 [inline] __se_sys_fcntl fs/fcntl.c:477 [inline] __x64_sys_fcntl+0x174/0x200 fs/fcntl.c:477 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f } ... key at: [] __key.2+0x0/0x40 ... acquired at: __raw_read_lock_irqsave include/linux/rwlock_api_smp.h:160 [inline] _raw_read_lock_irqsave+0x74/0x90 kernel/locking/spinlock.c:236 send_sigio+0x28/0x3c0 fs/fcntl.c:816 kill_fasync_rcu fs/fcntl.c:1035 [inline] kill_fasync fs/fcntl.c:1049 [inline] kill_fasync+0x1f6/0x4f0 fs/fcntl.c:1042 sock_wake_async+0x132/0x160 net/socket.c:1475 sk_wake_async include/net/sock.h:2440 [inline] sk_wake_async include/net/sock.h:2436 [inline] unix_shutdown+0x4be/0xa50 net/unix/af_unix.c:3088 __sys_shutdown_sock net/socket.c:2438 [inline] __sys_shutdown_sock net/socket.c:2432 [inline] __sys_shutdown+0xff/0x1c0 net/socket.c:2450 __do_sys_shutdown net/socket.c:2458 [inline] __se_sys_shutdown net/socket.c:2456 [inline] __x64_sys_shutdown+0x53/0x80 net/socket.c:2456 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f 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:5759 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5724 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228 __do_wait+0x105/0x890 kernel/exit.c:1591 do_wait+0x219/0x570 kernel/exit.c:1635 kernel_wait+0xa0/0x160 kernel/exit.c:1811 call_usermodehelper_exec_sync kernel/umh.c:137 [inline] call_usermodehelper_exec_work+0xf1/0x170 kernel/umh.c:164 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xed0 kernel/workqueue.c:3389 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 SOFTIRQ-ON-R at: lock_acquire kernel/locking/lockdep.c:5759 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5724 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228 __do_wait+0x105/0x890 kernel/exit.c:1591 do_wait+0x219/0x570 kernel/exit.c:1635 kernel_wait+0xa0/0x160 kernel/exit.c:1811 call_usermodehelper_exec_sync kernel/umh.c:137 [inline] call_usermodehelper_exec_work+0xf1/0x170 kernel/umh.c:164 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xed0 kernel/workqueue.c:3389 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 INITIAL USE at: lock_acquire kernel/locking/lockdep.c:5759 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5724 __raw_write_lock_irq include/linux/rwlock_api_smp.h:195 [inline] _raw_write_lock_irq+0x36/0x50 kernel/locking/spinlock.c:326 copy_process+0x4420/0x8de0 kernel/fork.c:2500 kernel_clone+0xfd/0x960 kernel/fork.c:2781 user_mode_thread+0xb4/0xf0 kernel/fork.c:2859 rest_init+0x23/0x2b0 init/main.c:712 start_kernel+0x3df/0x4c0 init/main.c:1103 x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:507 x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:488 common_startup_64+0x13e/0x148 INITIAL READ USE at: lock_acquire kernel/locking/lockdep.c:5759 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5724 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228 __do_wait+0x105/0x890 kernel/exit.c:1591 do_wait+0x219/0x570 kernel/exit.c:1635 kernel_wait+0xa0/0x160 kernel/exit.c:1811 call_usermodehelper_exec_sync kernel/umh.c:137 [inline] call_usermodehelper_exec_work+0xf1/0x170 kernel/umh.c:164 process_one_work+0x9c5/0x1b40 kernel/workqueue.c:3231 process_scheduled_works kernel/workqueue.c:3312 [inline] worker_thread+0x6c8/0xed0 kernel/workqueue.c:3389 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 } ... key at: [] tasklist_lock+0x18/0x40 ... acquired at: lock_acquire kernel/locking/lockdep.c:5759 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5724 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228 send_sigurg+0xb0/0xc30 fs/fcntl.c:871 sk_send_sigurg+0x7a/0x370 net/core/sock.c:3432 queue_oob net/unix/af_unix.c:2240 [inline] unix_stream_sendmsg+0xe37/0x10f0 net/unix/af_unix.c:2358 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0xab5/0xc90 net/socket.c:2597 ___sys_sendmsg+0x135/0x1e0 net/socket.c:2651 __sys_sendmmsg+0x1a1/0x450 net/socket.c:2737 __do_sys_sendmmsg net/socket.c:2766 [inline] __se_sys_sendmmsg net/socket.c:2763 [inline] __x64_sys_sendmmsg+0x9c/0x100 net/socket.c:2763 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f stack backtrace: CPU: 0 UID: 0 PID: 31917 Comm: syz.1.11420 Not tainted 6.11.0-rc6-syzkaller-00355-g5dadc1be8fc5 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:119 print_bad_irq_dependency kernel/locking/lockdep.c:2625 [inline] check_irq_usage+0xe3c/0x1490 kernel/locking/lockdep.c:2864 check_prev_add kernel/locking/lockdep.c:3137 [inline] check_prevs_add kernel/locking/lockdep.c:3252 [inline] validate_chain kernel/locking/lockdep.c:3868 [inline] __lock_acquire+0x2503/0x3cb0 kernel/locking/lockdep.c:5142 lock_acquire kernel/locking/lockdep.c:5759 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5724 __raw_read_lock include/linux/rwlock_api_smp.h:150 [inline] _raw_read_lock+0x5f/0x70 kernel/locking/spinlock.c:228 send_sigurg+0xb0/0xc30 fs/fcntl.c:871 sk_send_sigurg+0x7a/0x370 net/core/sock.c:3432 queue_oob net/unix/af_unix.c:2240 [inline] unix_stream_sendmsg+0xe37/0x10f0 net/unix/af_unix.c:2358 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0xab5/0xc90 net/socket.c:2597 ___sys_sendmsg+0x135/0x1e0 net/socket.c:2651 __sys_sendmmsg+0x1a1/0x450 net/socket.c:2737 __do_sys_sendmmsg net/socket.c:2766 [inline] __se_sys_sendmmsg net/socket.c:2763 [inline] __x64_sys_sendmmsg+0x9c/0x100 net/socket.c:2763 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff09c97cef9 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff09c3ff038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007ff09cb35f80 RCX: 00007ff09c97cef9 RDX: 0000000000000001 RSI: 0000000020006c40 RDI: 0000000000000003 RBP: 00007ff09c9ef046 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000040015 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ff09cb35f80 R15: 00007ffd3a48dc28