BUG: sleeping function called from invalid context at kernel/workqueue.c:4561 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 5226, name: udevd preempt_count: 100, expected: 0 RCU nest depth: 0, expected: 0 locks held by udevd/5226: 1, last CPU#0: #0: ffffc90000007c98 ((&vub300->inactivity_timer)){+.-.}-{0:0}, at: call_timer_fn+0x11d/0x5f0 kernel/time/timer.c:1745 Preemption disabled at: [] softirq_handle_begin kernel/softirq.c:486 [inline] [] handle_softirqs+0xf3/0x9b0 kernel/softirq.c:621 CPU: 0 UID: 0 PID: 5226 Comm: udevd Not tainted syzkaller #0 PREEMPT(lazy) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120 __might_resched.cold+0x1dc/0x222 kernel/sched/core.c:9264 __cancel_work_sync kernel/workqueue.c:4561 [inline] cancel_delayed_work_sync+0xb8/0xf0 kernel/workqueue.c:4642 mmc_free_host+0x19/0x40 drivers/mmc/core/host.c:700 vub300_delete drivers/mmc/host/vub300.c:379 [inline] kref_put include/linux/kref.h:65 [inline] vub300_inactivity_timer_expired drivers/mmc/host/vub300.c:747 [inline] vub300_inactivity_timer_expired+0x42f/0x550 drivers/mmc/host/vub300.c:742 call_timer_fn+0x198/0x5f0 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers+0x757/0xb00 kernel/time/timer.c:2374 __run_timer_base kernel/time/timer.c:2386 [inline] __run_timer_base kernel/time/timer.c:2378 [inline] run_timer_base+0x114/0x190 kernel/time/timer.c:2395 run_timer_softirq+0x1a/0x50 kernel/time/timer.c:2405 handle_softirqs+0x1d9/0x9b0 kernel/softirq.c:645 __do_softirq kernel/softirq.c:679 [inline] invoke_softirq kernel/softirq.c:519 [inline] __irq_exit_rcu+0x168/0x210 kernel/softirq.c:758 irq_exit_rcu+0x9/0x30 kernel/softirq.c:775 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0x8f/0xb0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:bpf_fd_pass+0x0/0x290 security/selinux/hooks.c:7341 Code: fe ff ff e8 c2 d9 71 ff e9 f1 fd ff ff e8 08 7d db 04 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <41> 55 41 54 55 89 f5 53 48 89 fb e8 60 a6 06 ff 48 8d 7b 48 48 b8 RSP: 0018:ffffc9000210fba8 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000044 RCX: 0000000000000000 RDX: ffff88811d1dbc80 RSI: 0000000000000044 RDI: ffff88811777c540 RBP: ffffc9000210fc78 R08: 0000000000000004 R09: 0000000000000044 R10: 0000000000000044 R11: 0000000000000000 R12: ffff88811777c540 R13: 1ffff92000421f7a R14: ffff88810f3d9500 R15: 0000000000000044 __file_has_perm+0x301/0x4a0 security/selinux/hooks.c:1799 file_has_perm security/selinux/hooks.c:1822 [inline] selinux_revalidate_file_permission security/selinux/hooks.c:3817 [inline] selinux_file_permission+0x4ac/0x6d0 security/selinux/hooks.c:3838 security_file_permission+0x3e/0x80 security/security.c:2392 rw_verify_area+0xaf/0x200 fs/read_write.c:475 vfs_write+0x146/0x1050 fs/read_write.c:678 ksys_write+0x1f8/0x250 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x119/0x710 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa426bc0407 Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffd71ab0c70 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fa426ad2880 RCX: 00007fa426bc0407 RDX: 0000000000000000 RSI: 00007ffd71ab0d17 RDI: 000000000000000a RBP: 000000000000000a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 00007fa426ad26e8 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ODEBUG: object ffffc90000007a60 is NOT on stack ffffc90002108000, but annotated. ------------[ cut here ]------------ 1 WARNING: lib/debugobjects.c:672 at debug_object_is_on_stack lib/debugobjects.c:672 [inline], CPU#0: udevd/5226 WARNING: lib/debugobjects.c:672 at lookup_object_or_alloc.part.0.cold+0x19/0x40 lib/debugobjects.c:705, CPU#0: udevd/5226 Modules linked in: CPU: 0 UID: 0 PID: 5226 Comm: udevd Tainted: G W syzkaller #0 PREEMPT(lazy) Tainted: [W]=WARN Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 RIP: 0010:debug_object_is_on_stack lib/debugobjects.c:672 [inline] RIP: 0010:lookup_object_or_alloc.part.0.cold+0x19/0x40 lib/debugobjects.c:705 Code: c4 60 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc 83 c5 01 89 2d 60 8b 0f 13 4c 89 e6 48 c7 c7 c0 c8 d2 87 e8 21 c2 fa ff 90 <0f> 0b 90 e9 b2 e0 bb 01 83 c5 01 89 2d 3f 8b 0f 13 49 39 c4 73 da RSP: 0018:ffffc900000078f0 EFLAGS: 00010082 RAX: 0000000000000050 RBX: ffff88811454b118 RCX: 0000000000000000 RDX: 0000000000000050 RSI: ffffffff8193b6e9 RDI: fffff52000000f0f RBP: 0000000000000001 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000101 R11: 0000000000000001 R12: ffffc90000007a60 R13: ffff88811d1dbc80 R14: 0000000000000001 R15: 0000000000000000 FS: 00007fa426ad2880(0000) GS:ffff8882683d5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fdd18a4e1d4 CR3: 0000000116d2c000 CR4: 00000000003506f0 Call Trace: lookup_object_or_alloc lib/debugobjects.c:682 [inline] __debug_object_init+0x2a9/0x3d0 lib/debugobjects.c:798 __synchronize_srcu+0x1c3/0x300 kernel/rcu/srcutree.c:1475 wakeup_source_remove drivers/base/power/wakeup.c:201 [inline] wakeup_source_unregister.part.0+0x12c/0x540 drivers/base/power/wakeup.c:237 wakeup_source_unregister+0x1f/0x30 drivers/base/power/wakeup.c:236 mmc_host_classdev_release+0x42/0x120 drivers/mmc/core/host.c:69 device_release+0xd2/0x270 drivers/base/core.c:2640 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1f7/0x640 lib/kobject.c:737 put_device+0x1f/0x30 drivers/base/core.c:3884 vub300_delete drivers/mmc/host/vub300.c:379 [inline] kref_put include/linux/kref.h:65 [inline] vub300_inactivity_timer_expired drivers/mmc/host/vub300.c:747 [inline] vub300_inactivity_timer_expired+0x42f/0x550 drivers/mmc/host/vub300.c:742 call_timer_fn+0x198/0x5f0 kernel/time/timer.c:1748 expire_timers kernel/time/timer.c:1799 [inline] __run_timers+0x757/0xb00 kernel/time/timer.c:2374 __run_timer_base kernel/time/timer.c:2386 [inline] __run_timer_base kernel/time/timer.c:2378 [inline] run_timer_base+0x114/0x190 kernel/time/timer.c:2395 run_timer_softirq+0x1a/0x50 kernel/time/timer.c:2405 handle_softirqs+0x1d9/0x9b0 kernel/softirq.c:645 __do_softirq kernel/softirq.c:679 [inline] invoke_softirq kernel/softirq.c:519 [inline] __irq_exit_rcu+0x168/0x210 kernel/softirq.c:758 irq_exit_rcu+0x9/0x30 kernel/softirq.c:775 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0x8f/0xb0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:bpf_fd_pass+0x0/0x290 security/selinux/hooks.c:7341 Code: fe ff ff e8 c2 d9 71 ff e9 f1 fd ff ff e8 08 7d db 04 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <41> 55 41 54 55 89 f5 53 48 89 fb e8 60 a6 06 ff 48 8d 7b 48 48 b8 RSP: 0018:ffffc9000210fba8 EFLAGS: 00000293 RAX: 0000000000000000 RBX: 0000000000000044 RCX: 0000000000000000 RDX: ffff88811d1dbc80 RSI: 0000000000000044 RDI: ffff88811777c540 RBP: ffffc9000210fc78 R08: 0000000000000004 R09: 0000000000000044 R10: 0000000000000044 R11: 0000000000000000 R12: ffff88811777c540 R13: 1ffff92000421f7a R14: ffff88810f3d9500 R15: 0000000000000044 __file_has_perm+0x301/0x4a0 security/selinux/hooks.c:1799 file_has_perm security/selinux/hooks.c:1822 [inline] selinux_revalidate_file_permission security/selinux/hooks.c:3817 [inline] selinux_file_permission+0x4ac/0x6d0 security/selinux/hooks.c:3838 security_file_permission+0x3e/0x80 security/security.c:2392 rw_verify_area+0xaf/0x200 fs/read_write.c:475 vfs_write+0x146/0x1050 fs/read_write.c:678 ksys_write+0x1f8/0x250 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x119/0x710 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa426bc0407 Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007ffd71ab0c70 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fa426ad2880 RCX: 00007fa426bc0407 RDX: 0000000000000000 RSI: 00007ffd71ab0d17 RDI: 000000000000000a RBP: 000000000000000a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 00007fa426ad26e8 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: ff ljmp (bad) 1: e8 c2 d9 71 ff call 0xff71d9c8 6: e9 f1 fd ff ff jmp 0xfffffdfc b: e8 08 7d db 04 call 0x4db7d18 10: 0f 1f 84 00 00 00 00 nopl 0x0(%rax,%rax,1) 17: 00 18: 90 nop 19: 90 nop 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 90 nop 1e: 90 nop 1f: 90 nop 20: 90 nop 21: 90 nop 22: 90 nop 23: 90 nop 24: 90 nop 25: 90 nop 26: 90 nop 27: 90 nop * 28: 41 55 push %r13 <-- trapping instruction 2a: 41 54 push %r12 2c: 55 push %rbp 2d: 89 f5 mov %esi,%ebp 2f: 53 push %rbx 30: 48 89 fb mov %rdi,%rbx 33: e8 60 a6 06 ff call 0xff06a698 38: 48 8d 7b 48 lea 0x48(%rbx),%rdi 3c: 48 rex.W 3d: b8 .byte 0xb8