BUG: sleeping function called from invalid context at kernel/workqueue.c:4561 in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 7062, name: rm preempt_count: 100, expected: 0 RCU nest depth: 0, expected: 0 locks held by rm/7062: 2, last CPU#0: #0: ffff8881102a4948 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x11d/0x590 mm/mmap_lock.c:310 #1: 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: 7062 Comm: rm 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:copy_mc_enhanced_fast_string+0x6/0xf arch/x86/lib/copy_mc_64.S:130 Code: 89 ca e9 1d fe ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 89 f8 48 89 d1 a4 31 c0 e9 d1 28 04 00 48 89 c8 e9 c9 28 04 00 66 0f 1f 84 00 RSP: 0000:ffffc90013e57c88 EFLAGS: 00010246 RAX: ffff888139e99000 RBX: 0000000000001000 RCX: 0000000000000cc0 RDX: 0000000000001000 RSI: ffff888115ed1340 RDI: ffff888139e99340 RBP: ffff888139e99000 R08: 0000000000000000 R09: ffffed1022bda3ff R10: ffff888115ed1fff R11: 0000000000000000 R12: ffff888115ed1000 R13: ffffea0004e7a640 R14: 0000000115ed1000 R15: ffffc90013e57d68 copy_mc_to_kernel+0x47/0xc0 arch/x86/lib/copy_mc.c:75 copy_mc_user_highpage include/linux/highmem.h:442 [inline] do_cow_fault mm/memory.c:6036 [inline] do_fault mm/memory.c:6136 [inline] do_pte_missing mm/memory.c:4700 [inline] handle_pte_fault mm/memory.c:6558 [inline] __handle_mm_fault+0xa02/0x3690 mm/memory.c:6707 handle_mm_fault+0x363/0xa20 mm/memory.c:6876 do_user_addr_fault+0x5a7/0x11d0 arch/x86/mm/fault.c:1343 handle_page_fault arch/x86/mm/fault.c:1483 [inline] exc_page_fault+0x66/0xc0 arch/x86/mm/fault.c:1536 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595 RIP: 0033:0x7f4fcee44ff2 Code: 0f 60 c0 66 0f 61 c0 66 0f 70 c0 00 48 83 fa 10 72 76 48 83 fa 20 77 12 0f 11 44 17 f0 0f 11 07 c3 0f 11 47 e0 0f 11 47 f0 c3 <0f> 11 07 0f 11 47 10 48 01 d7 48 83 fa 40 76 e7 0f 11 40 20 0f 11 RSP: 002b:00007ffc5cbc89f8 EFLAGS: 00010202 RAX: 00007f4fceb19048 RBX: 0000000000000004 RCX: 00007f4fceb1a088 RDX: 0000000000000fb8 RSI: 0000000000000000 RDI: 00007f4fceb19048 RBP: 00007ffc5cbc8d80 R08: 00007f4fceb19048 R09: 0000000000000003 R10: 0000000000000812 R11: 00007ffc5cbc8e68 R12: 00007ffc5cbc8aa8 R13: 00007f4fceb1b0c0 R14: 00007ffc5cbc8e20 R15: 00007f4fceb1a000 ODEBUG: object ffffc90000007a60 is NOT on stack ffffc90013e50000, but annotated. ------------[ cut here ]------------ 1 WARNING: lib/debugobjects.c:672 at debug_object_is_on_stack lib/debugobjects.c:672 [inline], CPU#0: rm/7062 WARNING: lib/debugobjects.c:672 at lookup_object_or_alloc.part.0.cold+0x19/0x40 lib/debugobjects.c:705, CPU#0: rm/7062 Modules linked in: CPU: 0 UID: 0 PID: 7062 Comm: rm 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: 0000:ffffc900000078f0 EFLAGS: 00010082 RAX: 0000000000000050 RBX: ffff888114ab0ee0 RCX: 0000000000000000 RDX: 0000000000000050 RSI: ffffffff8193b6e9 RDI: fffff52000000f0f RBP: 0000000000000001 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000101 R11: 0000000000000001 R12: ffffc90000007a60 R13: ffff88811a0e9e40 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8882683d5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4fceb19048 CR3: 000000011df74000 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:copy_mc_enhanced_fast_string+0x6/0xf arch/x86/lib/copy_mc_64.S:130 Code: 89 ca e9 1d fe ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 48 89 f8 48 89 d1 a4 31 c0 e9 d1 28 04 00 48 89 c8 e9 c9 28 04 00 66 0f 1f 84 00 RSP: 0000:ffffc90013e57c88 EFLAGS: 00010246 RAX: ffff888139e99000 RBX: 0000000000001000 RCX: 0000000000000cc0 RDX: 0000000000001000 RSI: ffff888115ed1340 RDI: ffff888139e99340 RBP: ffff888139e99000 R08: 0000000000000000 R09: ffffed1022bda3ff R10: ffff888115ed1fff R11: 0000000000000000 R12: ffff888115ed1000 R13: ffffea0004e7a640 R14: 0000000115ed1000 R15: ffffc90013e57d68 copy_mc_to_kernel+0x47/0xc0 arch/x86/lib/copy_mc.c:75 copy_mc_user_highpage include/linux/highmem.h:442 [inline] do_cow_fault mm/memory.c:6036 [inline] do_fault mm/memory.c:6136 [inline] do_pte_missing mm/memory.c:4700 [inline] handle_pte_fault mm/memory.c:6558 [inline] __handle_mm_fault+0xa02/0x3690 mm/memory.c:6707 handle_mm_fault+0x363/0xa20 mm/memory.c:6876 do_user_addr_fault+0x5a7/0x11d0 arch/x86/mm/fault.c:1343 handle_page_fault arch/x86/mm/fault.c:1483 [inline] exc_page_fault+0x66/0xc0 arch/x86/mm/fault.c:1536 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595 RIP: 0033:0x7f4fcee44ff2 Code: 0f 60 c0 66 0f 61 c0 66 0f 70 c0 00 48 83 fa 10 72 76 48 83 fa 20 77 12 0f 11 44 17 f0 0f 11 07 c3 0f 11 47 e0 0f 11 47 f0 c3 <0f> 11 07 0f 11 47 10 48 01 d7 48 83 fa 40 76 e7 0f 11 40 20 0f 11 RSP: 002b:00007ffc5cbc89f8 EFLAGS: 00010202 RAX: 00007f4fceb19048 RBX: 0000000000000004 RCX: 00007f4fceb1a088 RDX: 0000000000000fb8 RSI: 0000000000000000 RDI: 00007f4fceb19048 RBP: 00007ffc5cbc8d80 R08: 00007f4fceb19048 R09: 0000000000000003 R10: 0000000000000812 R11: 00007ffc5cbc8e68 R12: 00007ffc5cbc8aa8 R13: 00007f4fceb1b0c0 R14: 00007ffc5cbc8e20 R15: 00007f4fceb1a000 ---------------- Code disassembly (best guess): 0: 89 ca mov %ecx,%edx 2: e9 1d fe ff ff jmp 0xfffffe24 7: 66 66 2e 0f 1f 84 00 data16 cs nopw 0x0(%rax,%rax,1) e: 00 00 00 00 12: 66 90 xchg %ax,%ax 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 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: 48 89 f8 mov %rdi,%rax 27: 48 89 d1 mov %rdx,%rcx * 2a: f3 a4 rep movsb %ds:(%rsi),%es:(%rdi) <-- trapping instruction 2c: 31 c0 xor %eax,%eax 2e: e9 d1 28 04 00 jmp 0x42904 33: 48 89 c8 mov %rcx,%rax 36: e9 c9 28 04 00 jmp 0x42904 3b: 66 data16 3c: 0f .byte 0xf 3d: 1f (bad) 3e: 84 00 test %al,(%rax)