------------[ cut here ]------------ do not call blocking ops when !TASK_RUNNING; state=1 set at [] smpboot_thread_fn+0x63/0x9c0 kernel/smpboot.c:112 WARNING: CPU: 0 PID: 15 at kernel/sched/core.c:9656 __might_sleep+0x105/0x150 kernel/sched/core.c:9656 Modules linked in: CPU: 0 PID: 15 Comm: ksoftirqd/0 Tainted: G W 5.17.0-syzkaller-04796-g169e77764adc #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__might_sleep+0x105/0x150 kernel/sched/core.c:9656 Code: 70 02 00 48 8d bb f0 16 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 75 34 48 8b 93 f0 16 00 00 48 c7 c7 40 f6 cb 89 e8 c4 bb cb 07 <0f> 0b e9 75 ff ff ff e8 5f 3e 73 00 e9 26 ff ff ff 89 34 24 e8 62 RSP: 0018:ffffc90000007d68 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffff888010e43a00 RCX: 0000000000000000 RDX: ffff888010e43a00 RSI: ffffffff81602ba8 RDI: fffff52000000f9f RBP: ffffffff8a248700 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff815fd56e R11: 0000000000000000 R12: 00000000000002ff R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020028030 CR3: 0000000055be7000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: blk_release_queue+0x1f/0x320 block/blk-sysfs.c:767 kobject_cleanup lib/kobject.c:705 [inline] kobject_release lib/kobject.c:736 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1c8/0x540 lib/kobject.c:753 blkg_free.part.0+0x112/0x1f0 block/blk-cgroup.c:86 blkg_free block/blk-cgroup.c:78 [inline] __blkg_release+0x105/0x160 block/blk-cgroup.c:102 rcu_do_batch kernel/rcu/tree.c:2535 [inline] rcu_core+0x7b1/0x1880 kernel/rcu/tree.c:2786 __do_softirq+0x29b/0x9c2 kernel/softirq.c:558 invoke_softirq kernel/softirq.c:432 [inline] __irq_exit_rcu+0x123/0x180 kernel/softirq.c:637 irq_exit_rcu+0x5/0x20 kernel/softirq.c:649 sysvec_apic_timer_interrupt+0x93/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:smpboot_thread_fn+0x2a8/0x9c0 kernel/smpboot.c:158 Code: 02 0f 84 14 01 00 00 e8 06 ef 28 00 49 8d 7c 24 18 48 89 f8 48 c1 e8 03 80 3c 18 00 0f 85 39 06 00 00 48 89 e8 4d 8b 6c 24 18 <48> c1 e8 03 0f b6 04 18 84 c0 74 08 3c 03 0f 8e 79 06 00 00 8b 7d RSP: 0018:ffffc90000147ed0 EFLAGS: 00000246 RAX: ffff88823bc04000 RBX: dffffc0000000000 RCX: 0000000000000000 RDX: ffff888010e43a00 RSI: ffffffff8150241a RDI: ffffffff8bc389b8 RBP: ffff88823bc04000 R08: ffffffff89cbd9c0 R09: ffffffff81502402 R10: 0000000000000002 R11: 0000000000000001 R12: ffffffff8bc389a0 R13: ffffffff8147be70 R14: ffff888010e43a00 R15: 0000000000000001 kthread+0x2e9/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: 02 0f add (%rdi),%cl 2: 84 14 01 test %dl,(%rcx,%rax,1) 5: 00 00 add %al,(%rax) 7: e8 06 ef 28 00 callq 0x28ef12 c: 49 8d 7c 24 18 lea 0x18(%r12),%rdi 11: 48 89 f8 mov %rdi,%rax 14: 48 c1 e8 03 shr $0x3,%rax 18: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) 1c: 0f 85 39 06 00 00 jne 0x65b 22: 48 89 e8 mov %rbp,%rax 25: 4d 8b 6c 24 18 mov 0x18(%r12),%r13 * 2a: 48 c1 e8 03 shr $0x3,%rax <-- trapping instruction 2e: 0f b6 04 18 movzbl (%rax,%rbx,1),%eax 32: 84 c0 test %al,%al 34: 74 08 je 0x3e 36: 3c 03 cmp $0x3,%al 38: 0f 8e 79 06 00 00 jle 0x6b7 3e: 8b .byte 0x8b 3f: 7d .byte 0x7d