===================================================== WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected 6.18.0-rc6-next-20251119 #1 Not tainted ----------------------------------------------------- syz-executor.3/459526 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire: ffffffff85c0c098 (tasklist_lock){.+.+}-{3:3}, at: send_sigio+0xbb/0x370 and this task is already holding: ffff888034b351a0 (&f_owner->lock){....}-{3:3}, at: send_sigio+0x31/0x370 which would create a new lock dependency: (&f_owner->lock){....}-{3:3} -> (tasklist_lock){.+.+}-{3:3} but this new dependency connects a SOFTIRQ-irq-safe lock: (&dev->event_lock){..-.}-{3:3} ... which became SOFTIRQ-irq-safe at: lock_acquire+0x15e/0x2f0 _raw_spin_lock_irqsave+0x3a/0x60 input_inject_event+0x9f/0x3b0 led_set_brightness+0x215/0x290 led_trigger_event+0xda/0x270 kbd_bh+0x20e/0x2e0 tasklet_action_common+0x235/0x3b0 handle_softirqs+0x1b1/0x770 __irq_exit_rcu+0xc4/0x100 irq_exit_rcu+0x9/0x20 sysvec_apic_timer_interrupt+0x70/0x80 asm_sysvec_apic_timer_interrupt+0x1a/0x20 __sanitizer_cov_trace_pc+0x0/0x80 __tlb_remove_folio_pages+0x1a/0x40 unmap_page_range+0xeb3/0x3a40 unmap_single_vma+0x153/0x230 unmap_vmas+0x1d6/0x430 exit_mmap+0x178/0xa90 mmput+0xd5/0x390 do_exit+0x7a5/0x2970 do_group_exit+0xd3/0x2a0 get_signal+0x2311/0x2340 arch_do_signal_or_restart+0x80/0x7a0 exit_to_user_mode_loop+0x92/0x4d0 do_syscall_64+0x3c7/0x430 entry_SYSCALL_64_after_hwframe+0x77/0x7f to a SOFTIRQ-irq-unsafe lock: (tasklist_lock){.+.+}-{3:3} ... which became SOFTIRQ-irq-unsafe at: ... lock_acquire+0x15e/0x2f0 _raw_read_lock+0x5c/0x70 __do_wait+0x13e/0x8f0 do_wait+0x19f/0x560 kernel_wait+0x9f/0x160 call_usermodehelper_exec_work+0xf9/0x180 process_one_work+0x8e1/0x19c0 worker_thread+0x67e/0xe90 kthread+0x3c8/0x740 ret_from_fork+0x67a/0x7a0 ret_from_fork_asm+0x1a/0x30 other info that might help us debug this: Chain exists of: &dev->event_lock --> &f_owner->lock --> tasklist_lock Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(tasklist_lock); local_irq_disable(); lock(&dev->event_lock); lock(&f_owner->lock); lock(&dev->event_lock); *** DEADLOCK *** 6 locks held by syz-executor.3/459526: #0: ffff88800f3f83f8 (sb_writers#3){.+.+}-{0:0}, at: path_openat+0x10be/0x2a50 #1: ffffffff85f32330 (file_rwsem){++++}-{0:0}, at: do_dentry_open+0x701/0x1460 #2: ffff88800d758438 (&ctx->flc_lock){+.+.}-{3:3}, at: __break_lease+0x4ea/0x17e0 #3: ffffffff85e1ffe0 (rcu_read_lock){....}-{1:3}, at: kill_fasync+0x61/0x520 #4: ffff88800cd7a408 (&new->fa_lock){.-.-}-{3:3}, at: kill_fasync+0x137/0x520 #5: ffff888034b351a0 (&f_owner->lock){....}-{3:3}, at: send_sigio+0x31/0x370 the dependencies between SOFTIRQ-irq-safe lock and the holding lock: -> (&dev->event_lock){..-.}-{3:3} { IN-SOFTIRQ-W at: lock_acquire+0x15e/0x2f0 _raw_spin_lock_irqsave+0x3a/0x60 input_inject_event+0x9f/0x3b0 led_set_brightness+0x215/0x290 led_trigger_event+0xda/0x270 kbd_bh+0x20e/0x2e0 tasklet_action_common+0x235/0x3b0 handle_softirqs+0x1b1/0x770 __irq_exit_rcu+0xc4/0x100 irq_exit_rcu+0x9/0x20 sysvec_apic_timer_interrupt+0x70/0x80 asm_sysvec_apic_timer_interrupt+0x1a/0x20 __sanitizer_cov_trace_pc+0x0/0x80 __tlb_remove_folio_pages+0x1a/0x40 unmap_page_range+0xeb3/0x3a40 unmap_single_vma+0x153/0x230 unmap_vmas+0x1d6/0x430 exit_mmap+0x178/0xa90 mmput+0xd5/0x390 do_exit+0x7a5/0x2970 do_group_exit+0xd3/0x2a0 get_signal+0x2311/0x2340 arch_do_signal_or_restart+0x80/0x7a0 exit_to_user_mode_loop+0x92/0x4d0 do_syscall_64+0x3c7/0x430 entry_SYSCALL_64_after_hwframe+0x77/0x7f INITIAL USE at: lock_acquire+0x15e/0x2f0 _raw_spin_lock_irqsave+0x3a/0x60 input_inject_event+0x9f/0x3b0 led_set_brightness+0x215/0x290 kbd_led_trigger_activate+0xcd/0x110 led_trigger_set+0x4cc/0xaa0 led_trigger_set_default+0x1e7/0x2e0 led_classdev_register_ext+0x615/0x950 input_leds_connect+0x49b/0x870 input_attach_handler+0x17a/0x260 input_register_device+0x9ff/0x1050 atkbd_connect+0x5e6/0xa10 serio_driver_probe+0x84/0xe0 really_probe+0x240/0x820 __driver_probe_device+0x2c4/0x380 driver_probe_device+0x4e/0x2a0 __driver_attach+0x1b0/0x590 bus_for_each_dev+0x12b/0x1c0 serio_handle_event+0x23b/0xaa0 process_one_work+0x8e1/0x19c0 worker_thread+0x67e/0xe90 kthread+0x3c8/0x740 ret_from_fork+0x67a/0x7a0 ret_from_fork_asm+0x1a/0x30 } ... key at: [] __key.4+0x0/0x40 -> (&client->buffer_lock){....}-{3:3} { INITIAL USE at: lock_acquire+0x15e/0x2f0 _raw_spin_lock+0x2b/0x40 evdev_handle_get_val+0x70/0x5c0 evdev_do_ioctl+0xf6d/0x1990 evdev_ioctl+0x14a/0x1b0 __x64_sys_ioctl+0x18f/0x210 do_syscall_64+0xbf/0x430 entry_SYSCALL_64_after_hwframe+0x77/0x7f } ... key at: [] __key.90+0x0/0x40 ... acquired at: _raw_spin_lock+0x2b/0x40 evdev_handle_get_val+0x70/0x5c0 evdev_do_ioctl+0xf6d/0x1990 evdev_ioctl+0x14a/0x1b0 __x64_sys_ioctl+0x18f/0x210 do_syscall_64+0xbf/0x430 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> (&new->fa_lock){.-.-}-{3:3} { IN-HARDIRQ-R at: lock_acquire+0x15e/0x2f0 _raw_read_lock_irqsave+0x46/0x90 kill_fasync+0x137/0x520 perf_pending_irq+0x210/0x360 irq_work_single+0x128/0x260 irq_work_run_list+0x91/0xc0 irq_work_run+0x1d/0x40 __sysvec_irq_work+0x6d/0x360 sysvec_irq_work+0xa1/0xc0 asm_sysvec_irq_work+0x1a/0x20 native_apic_msr_write+0x2d/0x40 arch_irq_work_raise+0x4f/0x70 __irq_work_queue_local+0x19b/0x490 irq_work_queue+0xc0/0x100 __perf_event_overflow+0x5fd/0xcc0 perf_swevent_event+0x1d7/0x3f0 perf_tp_event+0x497/0xe70 perf_trace_run_bpf_submit+0xef/0x180 perf_trace_lock_acquire+0x3c2/0x700 lock_acquire+0xc5/0x2f0 _raw_spin_lock+0x2b/0x40 futex_wake+0x228/0x540 do_futex+0x26d/0x370 __x64_sys_futex+0x1c9/0x4d0 do_syscall_64+0xbf/0x430 entry_SYSCALL_64_after_hwframe+0x77/0x7f IN-SOFTIRQ-R at: lock_acquire+0x15e/0x2f0 _raw_read_lock_irqsave+0x46/0x90 kill_fasync+0x137/0x520 perf_pending_irq+0x210/0x360 irq_work_single+0x128/0x260 irq_work_run_list+0x91/0xc0 irq_work_run+0x1d/0x40 __sysvec_irq_work+0x6d/0x360 sysvec_irq_work+0x5f/0xc0 asm_sysvec_irq_work+0x1a/0x20 native_apic_msr_write+0x2d/0x40 arch_irq_work_raise+0x4f/0x70 __irq_work_queue_local+0x19b/0x490 irq_work_queue+0xc0/0x100 __perf_event_overflow+0x5fd/0xcc0 perf_swevent_event+0x1d7/0x3f0 perf_tp_event+0x497/0xe70 perf_trace_run_bpf_submit+0xef/0x180 perf_trace_lock_acquire+0x3c2/0x700 lock_acquire+0xc5/0x2f0 unwind_next_frame+0xcd/0x2540 arch_stack_walk+0x86/0xf0 stack_trace_save+0x8e/0xc0 kasan_save_stack+0x24/0x50 kasan_save_track+0x14/0x30 kasan_save_free_info+0x3a/0x60 __kasan_slab_free+0x43/0x70 kmem_cache_free+0x26f/0x500 rcu_core+0x7c8/0x1800 handle_softirqs+0x1b1/0x770 __irq_exit_rcu+0xc4/0x100 irq_exit_rcu+0x9/0x20 sysvec_irq_work+0xa6/0xc0 asm_sysvec_irq_work+0x1a/0x20 native_apic_msr_write+0x2d/0x40 arch_irq_work_raise+0x4f/0x70 __irq_work_queue_local+0x19b/0x490 irq_work_queue+0xc0/0x100 __perf_event_overflow+0x5fd/0xcc0 perf_swevent_event+0x1d7/0x3f0 perf_tp_event+0x497/0xe70 perf_trace_run_bpf_submit+0xef/0x180 perf_trace_lock_acquire+0x3c2/0x700 lock_acquire+0xc5/0x2f0 _raw_spin_lock+0x2b/0x40 futex_wait_setup+0xb9/0x530 __futex_wait+0x151/0x300 futex_wait+0xde/0x380 do_futex+0x2ee/0x370 __x64_sys_futex+0x1c9/0x4d0 do_syscall_64+0xbf/0x430 entry_SYSCALL_64_after_hwframe+0x77/0x7f INITIAL USE at: lock_acquire+0x15e/0x2f0 _raw_write_lock_irq+0x33/0x50 fasync_remove_entry+0xb2/0x1e0 fasync_helper+0xa6/0xc0 snd_fasync_helper+0x1ed/0x2a0 __fput+0x94b/0xb50 task_work_run+0x172/0x280 exit_to_user_mode_loop+0xff/0x4d0 do_syscall_64+0x3c7/0x430 entry_SYSCALL_64_after_hwframe+0x77/0x7f INITIAL READ USE at: lock_acquire+0x15e/0x2f0 _raw_read_lock_irqsave+0x75/0x90 kill_fasync+0x137/0x520 sock_wake_async+0xd6/0x160 sock_def_readable+0x4e0/0x5b0 netlink_unicast+0x745/0x870 netlink_ack+0x6ae/0xbf0 netlink_rcv_skb+0x344/0x430 netlink_unicast+0x5a7/0x870 netlink_sendmsg+0x8a3/0xd80 ____sys_sendmsg+0xa67/0xc20 ___sys_sendmsg+0x10f/0x1b0 __sys_sendmsg+0x150/0x200 do_syscall_64+0xbf/0x430 entry_SYSCALL_64_after_hwframe+0x77/0x7f } ... key at: [] __key.0+0x0/0x40 ... acquired at: _raw_read_lock_irqsave+0x75/0x90 kill_fasync+0x137/0x520 evdev_pass_values.part.0+0x665/0x940 evdev_events+0x3b5/0x430 input_pass_values+0x708/0x860 input_handle_event+0xdcf/0x13d0 input_inject_event+0x1e5/0x3b0 evdev_write+0x2e1/0x420 vfs_write+0x2b7/0x1150 ksys_write+0x1ef/0x240 do_syscall_64+0xbf/0x430 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> (&f_owner->lock){....}-{3:3} { INITIAL USE at: lock_acquire+0x15e/0x2f0 _raw_write_lock_irq+0x33/0x50 __f_setown+0x60/0x3c0 generic_setlease+0xec7/0x14d0 kernel_setlease+0x10c/0x130 vfs_setlease+0x1f1/0x290 do_fcntl_add_lease+0x3b0/0x540 fcntl_setlease+0xfa/0x180 do_fcntl+0x4e3/0x1500 __x64_sys_fcntl+0x155/0x1f0 do_syscall_64+0xbf/0x430 entry_SYSCALL_64_after_hwframe+0x77/0x7f INITIAL READ USE at: lock_acquire+0x15e/0x2f0 _raw_read_lock_irqsave+0x75/0x90 send_sigio+0x31/0x370 kill_fasync+0x218/0x520 sock_wake_async+0xd6/0x160 unix_release_sock+0xba3/0x1380 unix_release+0x91/0xf0 __sock_release+0xb3/0x270 sock_close+0x1c/0x30 __fput+0x401/0xb50 task_work_run+0x172/0x280 exit_to_user_mode_loop+0xff/0x4d0 do_syscall_64+0x3c7/0x430 entry_SYSCALL_64_after_hwframe+0x77/0x7f } ... key at: [] __key.1+0x0/0x40 ... acquired at: _raw_read_lock_irqsave+0x75/0x90 send_sigio+0x31/0x370 kill_fasync+0x218/0x520 sock_wake_async+0xd6/0x160 unix_release_sock+0xba3/0x1380 unix_release+0x91/0xf0 __sock_release+0xb3/0x270 sock_close+0x1c/0x30 __fput+0x401/0xb50 task_work_run+0x172/0x280 exit_to_user_mode_loop+0xff/0x4d0 do_syscall_64+0x3c7/0x430 entry_SYSCALL_64_after_hwframe+0x77/0x7f the dependencies between the lock to be acquired and SOFTIRQ-irq-unsafe lock: -> (tasklist_lock){.+.+}-{3:3} { HARDIRQ-ON-R at: lock_acquire+0x15e/0x2f0 _raw_read_lock+0x5c/0x70 __do_wait+0x13e/0x8f0 do_wait+0x19f/0x560 kernel_wait+0x9f/0x160 call_usermodehelper_exec_work+0xf9/0x180 process_one_work+0x8e1/0x19c0 worker_thread+0x67e/0xe90 kthread+0x3c8/0x740 ret_from_fork+0x67a/0x7a0 ret_from_fork_asm+0x1a/0x30 SOFTIRQ-ON-R at: lock_acquire+0x15e/0x2f0 _raw_read_lock+0x5c/0x70 __do_wait+0x13e/0x8f0 do_wait+0x19f/0x560 kernel_wait+0x9f/0x160 call_usermodehelper_exec_work+0xf9/0x180 process_one_work+0x8e1/0x19c0 worker_thread+0x67e/0xe90 kthread+0x3c8/0x740 ret_from_fork+0x67a/0x7a0 ret_from_fork_asm+0x1a/0x30 INITIAL USE at: lock_acquire+0x15e/0x2f0 _raw_write_lock_irq+0x33/0x50 copy_process+0x4299/0x72a0 kernel_clone+0xea/0x7f0 user_mode_thread+0xc8/0x110 rest_init+0x24/0x290 start_kernel+0x3fa/0x510 x86_64_start_reservations+0x18/0x30 x86_64_start_kernel+0x109/0x120 common_startup_64+0x13e/0x148 INITIAL READ USE at: lock_acquire+0x15e/0x2f0 _raw_read_lock+0x5c/0x70 __do_wait+0x13e/0x8f0 do_wait+0x19f/0x560 kernel_wait+0x9f/0x160 call_usermodehelper_exec_work+0xf9/0x180 process_one_work+0x8e1/0x19c0 worker_thread+0x67e/0xe90 kthread+0x3c8/0x740 ret_from_fork+0x67a/0x7a0 ret_from_fork_asm+0x1a/0x30 } ... key at: [] tasklist_lock+0x18/0x40 ... acquired at: lock_acquire+0x15e/0x2f0 _raw_read_lock+0x5c/0x70 send_sigio+0xbb/0x370 kill_fasync+0x218/0x520 lease_break_callback+0x23/0x30 __break_lease+0x6c4/0x17e0 do_dentry_open+0x701/0x1460 vfs_open+0x82/0x3f0 path_openat+0x1d3d/0x2a50 do_filp_open+0x1e8/0x450 do_sys_openat2+0x104/0x1b0 __x64_sys_creat+0xcc/0x120 do_syscall_64+0xbf/0x430 entry_SYSCALL_64_after_hwframe+0x77/0x7f stack backtrace: CPU: 0 UID: 0 PID: 459526 Comm: syz-executor.3 Not tainted 6.18.0-rc6-next-20251119 #1 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: dump_stack_lvl+0xca/0x120 check_irq_usage+0x6f6/0x790 __lock_acquire+0x13b5/0x1b70 lock_acquire+0x15e/0x2f0 _raw_read_lock+0x5c/0x70 send_sigio+0xbb/0x370 kill_fasync+0x218/0x520 lease_break_callback+0x23/0x30 __break_lease+0x6c4/0x17e0 do_dentry_open+0x701/0x1460 vfs_open+0x82/0x3f0 path_openat+0x1d3d/0x2a50 do_filp_open+0x1e8/0x450 do_sys_openat2+0x104/0x1b0 __x64_sys_creat+0xcc/0x120 do_syscall_64+0xbf/0x430 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f94356f2b19 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:00007f9432c68188 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007f9435805f60 RCX: 00007f94356f2b19 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000000 RBP: 00007f943574cf6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffee1d0a58f R14: 00007f9432c68300 R15: 0000000000022000 9pnet_fd: p9_fd_create_unix (459631): problem connecting socket: ./file0: -30 sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_ERROR driverbyte=DRIVER_OK cmd_age=0s sr 1:0:0:0: [sr0] tag#0 CDB: Service action in(16), sa=0x18 9e d8 a5 2e 5f 4c 52 bf 2c d9 1a 10 9pnet_fd: p9_fd_create_unix (459736): problem connecting socket: ./file0: -30 mac80211_hwsim hwsim40 wlan0: left promiscuous mode mac80211_hwsim hwsim40 wlan0: left allmulticast mode 9pnet_fd: p9_fd_create_unix (459745): problem connecting socket: ./file0: -30 9pnet_fd: p9_fd_create_unix (459920): problem connecting socket: ./file0: -30 9pnet_fd: p9_fd_create_unix (459957): problem connecting socket: ./file0: -30 9pnet_fd: p9_fd_create_unix (459965): problem connecting socket: ./file0: -30 9pnet_fd: p9_fd_create_unix (459970): problem connecting socket: ./file0: -30 Bluetooth: hci2: command 0x0406 tx timeout Bluetooth: hci1: command 0x0405 tx timeout EXT4-fs: dax option not supported EXT4-fs: dax option not supported