===================================================== WARNING: SOFTIRQ-safe -> SOFTIRQ-unsafe lock order detected 6.18.0-next-20251205 #1 Not tainted ----------------------------------------------------- syz-executor.4/97902 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire: ffff88804ae8e8a0 (&new->fa_lock){....}-{3:3}, at: kill_fasync+0x137/0x520 and this task is already holding: ffff8880508dd028 (&client->buffer_lock){....}-{3:3}, at: evdev_pass_values.part.0+0xf6/0x940 which would create a new lock dependency: (&client->buffer_lock){....}-{3:3} -> (&new->fa_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/0x2d0 _raw_spin_lock_irqsave+0x3a/0x60 input_inject_event+0x9f/0x3b0 led_set_brightness+0x215/0x290 led_trigger_event+0xda/0x270 kbd_bh+0x23a/0x310 tasklet_action_common+0x270/0x730 handle_softirqs+0x1b1/0x7d0 run_ksoftirqd+0x2e/0x60 smpboot_thread_fn+0x41d/0x9d0 kthread+0x3c8/0x740 ret_from_fork+0x67a/0x7a0 ret_from_fork_asm+0x1a/0x30 to a SOFTIRQ-irq-unsafe lock: (tasklist_lock){.+.+}-{3:3} ... which became SOFTIRQ-irq-unsafe at: ... lock_acquire+0x15e/0x2d0 _raw_read_lock+0x5c/0x70 __do_wait+0x13e/0x8f0 do_wait+0x19f/0x530 kernel_wait+0x9f/0x160 call_usermodehelper_exec_work+0xf9/0x180 process_one_work+0x8e1/0x1960 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 --> &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 *** 7 locks held by syz-executor.4/97902: #0: ffff88800f219118 (&evdev->mutex){+.+.}-{4:4}, at: evdev_write+0x165/0x420 #1: ffff888009cd8230 (&dev->event_lock){..-.}-{3:3}, at: input_inject_event+0x9f/0x3b0 #2: ffffffff85e21a60 (rcu_read_lock){....}-{1:3}, at: input_inject_event+0xbb/0x3b0 #3: ffffffff85e21a60 (rcu_read_lock){....}-{1:3}, at: input_pass_values+0x80/0x860 #4: ffffffff85e21a60 (rcu_read_lock){....}-{1:3}, at: evdev_events+0x80/0x430 #5: ffff8880508dd028 (&client->buffer_lock){....}-{3:3}, at: evdev_pass_values.part.0+0xf6/0x940 #6: ffffffff85e21a60 (rcu_read_lock){....}-{1:3}, at: kill_fasync+0x61/0x520 the dependencies between SOFTIRQ-irq-safe lock and the holding lock: -> (&dev->event_lock){..-.}-{3:3} { IN-SOFTIRQ-W at: lock_acquire+0x15e/0x2d0 _raw_spin_lock_irqsave+0x3a/0x60 input_inject_event+0x9f/0x3b0 led_set_brightness+0x215/0x290 led_trigger_event+0xda/0x270 kbd_bh+0x23a/0x310 tasklet_action_common+0x270/0x730 handle_softirqs+0x1b1/0x7d0 run_ksoftirqd+0x2e/0x60 smpboot_thread_fn+0x41d/0x9d0 kthread+0x3c8/0x740 ret_from_fork+0x67a/0x7a0 ret_from_fork_asm+0x1a/0x30 INITIAL USE at: lock_acquire+0x15e/0x2d0 _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+0x8e1/0x1960 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/0x2d0 _raw_spin_lock+0x2b/0x40 evdev_pass_values.part.0+0xf6/0x940 evdev_events+0x3b5/0x430 input_pass_values+0x708/0x860 input_handle_event+0xd60/0x13d0 input_inject_event+0x1e5/0x3b0 evdev_do_ioctl+0x54c/0x1990 evdev_ioctl+0x14a/0x1b0 __x64_sys_ioctl+0x18f/0x210 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f } ... key at: [] __key.93+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+0xd60/0x13d0 input_inject_event+0x1e5/0x3b0 evdev_do_ioctl+0x54c/0x1990 evdev_ioctl+0x14a/0x1b0 __x64_sys_ioctl+0x18f/0x210 do_syscall_64+0xbf/0x420 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/0x2d0 _raw_read_lock+0x5c/0x70 __do_wait+0x13e/0x8f0 do_wait+0x19f/0x530 kernel_wait+0x9f/0x160 call_usermodehelper_exec_work+0xf9/0x180 process_one_work+0x8e1/0x1960 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/0x2d0 _raw_read_lock+0x5c/0x70 __do_wait+0x13e/0x8f0 do_wait+0x19f/0x530 kernel_wait+0x9f/0x160 call_usermodehelper_exec_work+0xf9/0x180 process_one_work+0x8e1/0x1960 worker_thread+0x67e/0xe90 kthread+0x3c8/0x740 ret_from_fork+0x67a/0x7a0 ret_from_fork_asm+0x1a/0x30 INITIAL USE at: lock_acquire+0x15e/0x2d0 _raw_write_lock_irq+0x33/0x50 copy_process+0x4e71/0x7230 kernel_clone+0xea/0x7c0 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/0x2d0 _raw_read_lock+0x5c/0x70 __do_wait+0x13e/0x8f0 do_wait+0x19f/0x530 kernel_wait+0x9f/0x160 call_usermodehelper_exec_work+0xf9/0x180 process_one_work+0x8e1/0x1960 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+0x6c4/0x1760 vfs_truncate+0x30d/0x480 do_sys_truncate.part.0+0xfa/0x140 __x64_sys_truncate+0x6d/0xa0 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> (&f_owner->lock){....}-{3:3} { INITIAL USE at: lock_acquire+0x15e/0x2d0 _raw_write_lock_irq+0x33/0x50 __f_setown+0x60/0x3c0 f_setown+0xf3/0x2d0 sock_ioctl+0x2a4/0x630 __x64_sys_ioctl+0x18f/0x210 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f INITIAL READ USE at: lock_acquire+0x15e/0x2d0 _raw_read_lock_irqsave+0x75/0x90 send_sigurg+0x60/0xc90 sk_send_sigurg+0x76/0x360 unix_stream_sendmsg+0xfce/0x1360 ____sys_sendmsg+0xa34/0xbf0 ___sys_sendmsg+0x10f/0x1b0 __sys_sendmsg+0x150/0x200 do_syscall_64+0xbf/0x420 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+0x6c4/0x1760 vfs_truncate+0x30d/0x480 do_sys_truncate.part.0+0xfa/0x140 __x64_sys_truncate+0x6d/0xa0 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> (&new->fa_lock){....}-{3:3} { INITIAL USE at: lock_acquire+0x15e/0x2d0 _raw_write_lock_irq+0x33/0x50 fasync_remove_entry+0xb2/0x1e0 fasync_helper+0xa6/0xc0 vcs_fasync+0x55/0xb0 __fput+0x94b/0xb50 fput_close_sync+0x10f/0x230 __x64_sys_close+0x8f/0x120 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f INITIAL READ USE at: lock_acquire+0x15e/0x2d0 _raw_read_lock_irqsave+0x75/0x90 kill_fasync+0x137/0x520 lease_break_callback+0x23/0x30 __break_lease+0x6c4/0x1760 vfs_truncate+0x30d/0x480 do_sys_truncate.part.0+0xfa/0x140 __x64_sys_truncate+0x6d/0xa0 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f } ... key at: [] __key.0+0x0/0x40 ... acquired at: lock_acquire+0x15e/0x2d0 _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/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f stack backtrace: CPU: 1 UID: 0 PID: 97902 Comm: syz-executor.4 Not tainted 6.18.0-next-20251205 #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+0x831/0xb40 __lock_acquire+0x128b/0x2250 lock_acquire+0x15e/0x2d0 _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/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9ab732ab19 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:00007f9ab48a0188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f9ab743df60 RCX: 00007f9ab732ab19 RDX: 000000000000ff2f RSI: 00000000200000c0 RDI: 0000000000000004 RBP: 00007f9ab7384f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffd5a13ef9f R14: 00007f9ab48a0300 R15: 0000000000022000 syz-executor.5: page allocation failure: order:0, mode:0x10cc0(GFP_KERNEL|__GFP_NORETRY), nodemask=(null),cpuset=/,mems_allowed=0 CPU: 0 UID: 0 PID: 97899 Comm: syz-executor.5 Not tainted 6.18.0-next-20251205 #1 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 Call Trace: dump_stack_lvl+0xfa/0x120 warn_alloc+0x211/0x370 __alloc_frozen_pages_noprof+0x133a/0x2000 alloc_pages_mpol+0xed/0x340 alloc_pages_noprof+0xa1/0x380 kimage_alloc_pages+0x70/0x240 kimage_alloc_control_pages+0x18f/0x970 do_kexec_load+0x417/0x870 __x64_sys_kexec_load+0x1c6/0x230 do_syscall_64+0xbf/0x420 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f828df58b19 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:00007f828b4ce188 EFLAGS: 00000246 ORIG_RAX: 00000000000000f6 RAX: ffffffffffffffda RBX: 00007f828e06bf60 RCX: 00007f828df58b19 RDX: 0000000020000040 RSI: 0000000000000010 RDI: 0000000000000000 RBP: 00007f828dfb2f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc0fe38e1f R14: 00007f828b4ce300 R15: 0000000000022000 Mem-Info: active_anon:1269 inactive_anon:43507 isolated_anon:126 active_file:10168 inactive_file:12850 isolated_file:55 unevictable:0 dirty:70 writeback:0 slab_reclaimable:6379 slab_unreclaimable:86515 mapped:73784 shmem:224 pagetables:9339 sec_pagetables:0 bounce:0 kernel_misc_reclaimable:0 free:5972 free_pcp:0 free_cma:0 Node 0 active_anon:5076kB inactive_anon:174532kB active_file:40840kB inactive_file:51400kB unevictable:0kB isolated(anon):84kB isolated(file):52kB mapped:295136kB dirty:280kB writeback:0kB shmem:896kB kernel_stack:12832kB pagetables:37356kB sec_pagetables:0kB all_unreclaimable? no Balloon:0kB Node 0 DMA free:6440kB boost:0kB min:44kB low:56kB high:68kB reserved_highatomic:0KB free_highatomic:0KB active_anon:0kB inactive_anon:0kB active_file:4kB inactive_file:60kB unevictable:0kB writepending:0kB zspages:0kB present:15992kB managed:15360kB mlocked:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB lowmem_reserve[]: 0 1599 1599 1599 Node 0 DMA32 free:17308kB boost:12480kB min:17552kB low:19176kB high:20800kB reserved_highatomic:2048KB free_highatomic:0KB active_anon:5076kB inactive_anon:174112kB active_file:40836kB inactive_file:51244kB unevictable:0kB writepending:448kB zspages:0kB present:2080640kB managed:1637976kB mlocked:0kB bounce:0kB free_pcp:648kB local_pcp:0kB free_cma:0kB lowmem_reserve[]: 0 0 0 0 Node 0 DMA: 7*4kB (UM) 3*8kB (M) 1*16kB (M) 3*32kB (UM) 2*64kB (UM) 0*128kB 2*256kB (UM) 1*512kB (M) 1*1024kB (M) 0*2048kB 1*4096kB (M) = 6436kB Node 0 DMA32: 60*4kB (UME) 41*8kB (UE) 96*16kB (UME) 75*32kB (UME) 38*64kB (UME) 21*128kB (UME) 13*256kB (UME) 7*512kB (UM) 1*1024kB (M) 0*2048kB 0*4096kB = 17560kB Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB 23249 total pagecache pages 0 pages in swap cache Free swap = 0kB Total swap = 0kB 524158 pages RAM 0 pages HighMem/MovableOnly 110824 pages reserved Memory cgroup min protection 0kB -- low protection 478937088kB kexec: Could not allocate control_code_buffer tmpfs: Bad value for 'mpol' tmpfs: Bad value for 'mpol' tmpfs: Bad value for 'mpol' tmpfs: Bad value for 'mpol' tmpfs: Bad value for 'mpol'