------------[ cut here ]------------ do not call blocking ops when !TASK_RUNNING; state=2 set at [] schedule_timeout_uninterruptible+0x12/0xb0 kernel/time/sleep_timeout.c:157 WARNING: kernel/sched/core.c:9179 at __might_sleep+0x94/0xc0 kernel/sched/core.c:9179, CPU#0: kworker/0:8/7448 Modules linked in: CPU: 0 UID: 0 PID: 7448 Comm: kworker/0:8 Not tainted syzkaller #0 PREEMPT(lazy) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 Workqueue: usb_hub_wq hub_event RIP: 0010:__might_sleep+0x97/0xc0 kernel/sched/core.c:9179 Code: 8b 94 24 c0 17 00 00 48 85 d2 75 14 48 83 c4 08 89 ee 48 89 df 31 d2 5b 5d 41 5c e9 33 fc ff ff 48 8d 3d 5c dd 92 09 48 89 d1 <67> 48 0f b9 3a eb db e8 fd 20 9c 00 eb 9f 89 74 24 04 e8 22 21 9c RSP: 0018:ffffc90000007bd8 EFLAGS: 00010286 RAX: dffffc0000000000 RBX: ffffffff87a86760 RCX: ffffffff878ad142 RDX: ffffffff878ad142 RSI: 0000000000000002 RDI: ffffffff8b16a5e0 RBP: 00000000000011d1 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88811575bc80 R13: 8000000000000100 R14: 1ffff92000000f8d R15: ffffffff85f2b320 FS: 0000000000000000(0000) GS:ffff8882683e2000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2f3f3ff8 CR3: 000000011cc56000 CR4: 00000000003506f0 Call Trace: __cancel_work_sync kernel/workqueue.c:4561 [inline] cancel_delayed_work_sync+0xb8/0xf0 kernel/workqueue.c:4642 mmc_free_host+0x19/0x30 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:debug_timer_assert_init kernel/time/timer.c:803 [inline] RIP: 0010:debug_assert_init kernel/time/timer.c:848 [inline] RIP: 0010:__mod_timer+0x90/0xca0 kernel/time/timer.c:1025 Code: 08 00 f2 f2 f2 c7 40 0c 00 f3 f3 f3 65 48 8b 05 5e 61 83 0b 48 89 84 24 d8 00 00 00 31 c0 e8 f7 79 14 00 48 c7 c6 c0 4c ad 87 <48> 89 df 48 c7 44 24 60 00 00 00 00 48 c7 84 24 80 00 00 00 00 00 RSP: 0018:ffffc900154476b8 EFLAGS: 00000287 RAX: 0000000000011750 RBX: ffffc90015447800 RCX: ffffc90011204000 RDX: 0000000000100000 RSI: ffffffff87ad4cc0 RDI: ffffc90015447800 RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000000004 R14: ffff88811575bc80 R15: dffffc0000000000 add_timer+0x62/0x90 kernel/time/timer.c:1249 schedule_timeout+0x122/0x280 kernel/time/sleep_timeout.c:98 msleep+0x32/0x50 kernel/time/sleep_timeout.c:318 hub_port_debounce+0x183/0x3f0 drivers/usb/core/hub.c:4741 hub_port_debounce_be_stable drivers/usb/core/hub.h:184 [inline] hub_port_connect drivers/usb/core/hub.c:5432 [inline] hub_port_connect_change drivers/usb/core/hub.c:5720 [inline] port_event drivers/usb/core/hub.c:5884 [inline] hub_event+0x3248/0x4510 drivers/usb/core/hub.c:5966 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396 process_scheduled_works kernel/workqueue.c:3479 [inline] worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560 kthread+0x373/0x450 kernel/kthread.c:436 ret_from_fork+0x69f/0xc90 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ---------------- Code disassembly (best guess): 0: 8b 94 24 c0 17 00 00 mov 0x17c0(%rsp),%edx 7: 48 85 d2 test %rdx,%rdx a: 75 14 jne 0x20 c: 48 83 c4 08 add $0x8,%rsp 10: 89 ee mov %ebp,%esi 12: 48 89 df mov %rbx,%rdi 15: 31 d2 xor %edx,%edx 17: 5b pop %rbx 18: 5d pop %rbp 19: 41 5c pop %r12 1b: e9 33 fc ff ff jmp 0xfffffc53 20: 48 8d 3d 5c dd 92 09 lea 0x992dd5c(%rip),%rdi # 0x992dd83 27: 48 89 d1 mov %rdx,%rcx * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: eb db jmp 0xc 31: e8 fd 20 9c 00 call 0x9c2133 36: eb 9f jmp 0xffffffd7 38: 89 74 24 04 mov %esi,0x4(%rsp) 3c: e8 .byte 0xe8 3d: 22 21 and (%rcx),%ah 3f: 9c pushf