======================================================== WARNING: possible irq lock inversion dependency detected 6.18.0-rc5-next-20251113 #1 Not tainted -------------------------------------------------------- kworker/0:1/11 just changed the state of lock: ffff88800a2b4230 (&dev->event_lock){..-.}-{3:3}, at: input_inject_event+0x9f/0x3b0 but this lock took another, SOFTIRQ-READ-unsafe lock in the past: (tasklist_lock){.+.+}-{3:3} and interrupts could create inverse lock ordering between them. other info that might help us debug this: Chain exists of: &dev->event_lock --> &client->buffer_lock --> tasklist_lock Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(tasklist_lock); local_irq_disable(); lock(&dev->event_lock); lock(&client->buffer_lock); lock(&dev->event_lock); *** DEADLOCK *** 4 locks held by kworker/0:1/11: #0: ffff888008c61948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x1245/0x19c0 #1: ffff888009607cb8 (console_work){+.+.}-{0:0}, at: process_one_work+0x857/0x19c0 #2: ffffffff85e12940 (console_lock){+.+.}-{0:0}, at: console_callback+0x64/0x420 #3: ffffffff85e1fd40 (rcu_read_lock){....}-{1:3}, at: led_trigger_event+0x61/0x270 the shortest dependencies between 2nd lock and 1st 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: _raw_read_lock+0x5c/0x70 send_sigio+0xbb/0x370 kill_fasync+0x218/0x520 lease_break_callback+0x23/0x30 __break_lease+0x3e8/0x1450 do_dentry_open+0x6b4/0x1430 vfs_open+0x82/0x3f0 path_openat+0x1c3f/0x2880 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 -> (&f_owner->lock){....}-{3:3} { INITIAL USE at: lock_acquire+0x15e/0x2f0 _raw_write_lock_irq+0x33/0x50 __f_setown+0x60/0x3c0 fcntl_dirnotify+0x623/0xb60 do_fcntl+0xf2d/0x1430 __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 lease_break_callback+0x23/0x30 __break_lease+0x3e8/0x1450 do_dentry_open+0x6b4/0x1430 vfs_open+0x82/0x3f0 path_openat+0x1c3f/0x2880 do_filp_open+0x1e8/0x450 do_sys_openat2+0x104/0x1b0 __x64_sys_open+0x11c/0x1c0 do_syscall_64+0xbf/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 lease_break_callback+0x23/0x30 __break_lease+0x3e8/0x1450 do_dentry_open+0x6b4/0x1430 vfs_open+0x82/0x3f0 path_openat+0x1c3f/0x2880 do_filp_open+0x1e8/0x450 do_sys_openat2+0x104/0x1b0 __x64_sys_open+0x11c/0x1c0 do_syscall_64+0xbf/0x430 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> (&new->fa_lock){....}-{3:3} { INITIAL USE at: lock_acquire+0x15e/0x2f0 _raw_write_lock_irq+0x33/0x50 fasync_remove_entry+0xb2/0x1e0 fasync_helper+0xa6/0xc0 lease_modify+0x2ab/0x620 locks_remove_file+0x294/0x5a0 __fput+0x351/0xb50 fput_close_sync+0x10f/0x230 __x64_sys_close+0x8f/0x120 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 kill_fasync+0x137/0x520 lease_break_callback+0x23/0x30 __break_lease+0x3e8/0x1450 do_dentry_open+0x6b4/0x1430 vfs_open+0x82/0x3f0 path_openat+0x1c3f/0x2880 do_filp_open+0x1e8/0x450 do_sys_openat2+0x104/0x1b0 __x64_sys_open+0x11c/0x1c0 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 -> (&client->buffer_lock){....}-{3:3} { INITIAL USE at: lock_acquire+0x15e/0x2f0 _raw_spin_lock+0x2b/0x40 evdev_pass_values.part.0+0xf6/0x940 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 } ... key at: [] __key.90+0x0/0x40 ... acquired at: _raw_spin_lock+0x2b/0x40 evdev_pass_values.part.0+0xf6/0x940 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 -> (&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 __tasklet_schedule_common+0xb4/0x100 vt_set_leds_compute_shiftstate+0x78/0x80 redraw_screen+0x526/0x730 complete_change_console+0x106/0x5e0 change_console+0x19f/0x540 console_callback+0x3ba/0x420 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_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 ... acquired at: __lock_acquire+0x855/0x1b70 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 __tasklet_schedule_common+0xb4/0x100 vt_set_leds_compute_shiftstate+0x78/0x80 redraw_screen+0x526/0x730 complete_change_console+0x106/0x5e0 change_console+0x19f/0x540 console_callback+0x3ba/0x420 process_one_work+0x8e1/0x19c0 worker_thread+0x67e/0xe90 kthread+0x3c8/0x740 ret_from_fork+0x67a/0x7a0 ret_from_fork_asm+0x1a/0x30 stack backtrace: CPU: 0 UID: 0 PID: 11 Comm: kworker/0:1 Not tainted 6.18.0-rc5-next-20251113 #1 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Workqueue: events console_callback Call Trace: dump_stack_lvl+0xca/0x120 print_irq_inversion_bug.part.0+0x20a/0x260 mark_lock+0x526/0x750 __lock_acquire+0x855/0x1b70 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 RIP: 0010:__tasklet_schedule_common+0xb4/0x100 Code: 49 89 6d 00 44 89 e7 48 89 6b 08 e8 a6 f9 ff ff 65 8b 05 3f 9d 6c 06 a9 00 ff ff 00 74 22 4d 85 f6 74 06 e8 ae 57 41 00 fb 5b <5d> 41 5c 41 5d 41 5e e9 70 f1 8c 03 e8 3b 59 41 00 e9 58 ff ff ff RSP: 0018:ffff8880096079f8 EFLAGS: 00000206 RAX: 00000000000336f9 RBX: ffff888015477000 RCX: 0000000000000040 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff813c2302 RBP: ffffffff86137aa0 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8664e957 R11: 0000000000000001 R12: 0000000000000006 R13: ffff88806ce23fa0 R14: 0000000000000200 R15: 0000000000000000 vt_set_leds_compute_shiftstate+0x78/0x80 redraw_screen+0x526/0x730 complete_change_console+0x106/0x5e0 change_console+0x19f/0x540 console_callback+0x3ba/0x420 process_one_work+0x8e1/0x19c0 worker_thread+0x67e/0xe90 kthread+0x3c8/0x740 ret_from_fork+0x67a/0x7a0 ret_from_fork_asm+0x1a/0x30 Bluetooth: hci0: Opcode 0x0401 failed: -110 audit: type=1326 audit(1763021720.386:268): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=118533 comm="syz-executor.2" exe="/syz-executor.2" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7ff9c9969b19 code=0x0 audit: type=1326 audit(1763021721.265:269): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=118871 comm="syz-executor.2" exe="/syz-executor.2" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7ff9c9969b19 code=0x0 audit: type=1326 audit(1763021721.307:270): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=118879 comm="syz-executor.3" exe="/syz-executor.3" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fa45b23ab19 code=0x0 audit: type=1326 audit(1763021722.125:271): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=118879 comm="syz-executor.3" exe="/syz-executor.3" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fa45b23ab19 code=0x0 audit: type=1326 audit(1763021722.255:272): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=118908 comm="syz-executor.2" exe="/syz-executor.2" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7ff9c9969b19 code=0x0 audit: type=1326 audit(1763021722.331:273): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=118916 comm="syz-executor.3" exe="/syz-executor.3" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fa45b23ab19 code=0x0 sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK cmd_age=0s sr 1:0:0:0: [sr0] tag#0 Sense Key : Not Ready [current] sr 1:0:0:0: [sr0] tag#0 Add. Sense: Medium not present sr 1:0:0:0: [sr0] tag#0 CDB: Read(10) 28 00 00 00 00 00 00 00 08 00 I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 4 prio class 2 sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK cmd_age=0s sr 1:0:0:0: [sr0] tag#0 Sense Key : Not Ready [current] sr 1:0:0:0: [sr0] tag#0 Add. Sense: Medium not present sr 1:0:0:0: [sr0] tag#0 CDB: Read(10) 28 00 00 00 00 00 00 00 08 00 I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 3 prio class 2 audit: type=1326 audit(1763021723.209:274): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=119348 comm="syz-executor.2" exe="/syz-executor.2" sig=9 arch=c000003e syscall=231 compat=0 ip=0x7ff9c9969b19 code=0x0 sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK cmd_age=0s sr 1:0:0:0: [sr0] tag#0 Sense Key : Not Ready [current] sr 1:0:0:0: [sr0] tag#0 Add. Sense: Medium not present sr 1:0:0:0: [sr0] tag#0 CDB: Read(10) 28 00 00 00 00 00 00 00 08 00 I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 4 prio class 2 audit: type=1326 audit(1763021723.300:275): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=119359 comm="syz-executor.3" exe="/syz-executor.3" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fa45b23ab19 code=0x0 sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK cmd_age=0s sr 1:0:0:0: [sr0] tag#0 Sense Key : Not Ready [current] sr 1:0:0:0: [sr0] tag#0 Add. Sense: Medium not present sr 1:0:0:0: [sr0] tag#0 CDB: Read(10) 28 00 00 00 00 00 00 00 08 00 I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 4 prio class 2 audit: type=1326 audit(1763021724.199:276): auid=0 uid=0 gid=0 ses=4 subj=system_u:system_r:kernel_t:s0 pid=119376 comm="syz-executor.3" exe="/syz-executor.3" sig=31 arch=c000003e syscall=202 compat=0 ip=0x7fa45b23ab19 code=0x0 sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK cmd_age=0s sr 1:0:0:0: [sr0] tag#0 Sense Key : Not Ready [current] sr 1:0:0:0: [sr0] tag#0 Add. Sense: Medium not present sr 1:0:0:0: [sr0] tag#0 CDB: Read(10) 28 00 00 00 00 00 00 00 08 00 I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 4 prio class 2 sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK cmd_age=0s sr 1:0:0:0: [sr0] tag#0 Sense Key : Not Ready [current] sr 1:0:0:0: [sr0] tag#0 Add. Sense: Medium not present sr 1:0:0:0: [sr0] tag#0 CDB: Read(10) 28 00 00 00 00 00 00 00 08 00 I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 4 prio class 2 sr 1:0:0:0: [sr0] tag#0 FAILED Result: hostbyte=DID_OK driverbyte=DRIVER_OK cmd_age=0s sr 1:0:0:0: [sr0] tag#0 Sense Key : Not Ready [current] sr 1:0:0:0: [sr0] tag#0 Add. Sense: Medium not present sr 1:0:0:0: [sr0] tag#0 CDB: Read(10) 28 00 00 00 00 00 00 00 08 00 I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 4 prio class 2 ---------------- Code disassembly (best guess): 0: 49 89 6d 00 mov %rbp,0x0(%r13) 4: 44 89 e7 mov %r12d,%edi 7: 48 89 6b 08 mov %rbp,0x8(%rbx) b: e8 a6 f9 ff ff callq 0xfffff9b6 10: 65 8b 05 3f 9d 6c 06 mov %gs:0x66c9d3f(%rip),%eax # 0x66c9d56 17: a9 00 ff ff 00 test $0xffff00,%eax 1c: 74 22 je 0x40 1e: 4d 85 f6 test %r14,%r14 21: 74 06 je 0x29 23: e8 ae 57 41 00 callq 0x4157d6 28: fb sti 29: 5b pop %rbx * 2a: 5d pop %rbp <-- trapping instruction 2b: 41 5c pop %r12 2d: 41 5d pop %r13 2f: 41 5e pop %r14 31: e9 70 f1 8c 03 jmpq 0x38cf1a6 36: e8 3b 59 41 00 callq 0x415976 3b: e9 58 ff ff ff jmpq 0xffffff98