------------[ cut here ]------------ do not call blocking ops when !TASK_RUNNING; state=1 set at [] ep_poll fs/eventpoll.c:1818 [inline] do not call blocking ops when !TASK_RUNNING; state=1 set at [] do_epoll_wait+0xba0/0x1930 fs/eventpoll.c:2234 WARNING: CPU: 1 PID: 4687 at kernel/sched/core.c:9689 __might_sleep+0x105/0x150 kernel/sched/core.c:9689 Modules linked in: CPU: 1 PID: 4687 Comm: udevd Tainted: G W 5.17.0-next-20220323-syzkaller #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:9689 Code: 70 02 00 48 8d bb f8 16 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 75 34 48 8b 93 f8 16 00 00 48 c7 c7 20 dc cb 89 e8 0b a5 c8 07 <0f> 0b e9 75 ff ff ff e8 0f 3d 73 00 e9 26 ff ff ff 89 34 24 e8 12 RSP: 0018:ffffc900001e0d68 EFLAGS: 00010286 RAX: 0000000000000000 RBX: ffff8880163dd7c0 RCX: 0000000000000000 RDX: ffff8880163dd7c0 RSI: ffffffff815fc948 RDI: fffff5200003c19f RBP: ffffffff8a248480 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff815f730e R11: 0000000000000000 R12: 00000000000002fe R13: 0000000000000000 R14: ffffffff8a248880 R15: 0000000000000000 FS: 00007f598f1bd840(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc6a50de68 CR3: 0000000074894000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: blk_release_queue+0x1f/0x320 block/blk-sysfs.c:766 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:645 RIP: 0010:check_preemption_disabled+0x9/0x170 lib/smp_processor_id.c:13 Code: 3f f8 65 48 8b 3c 25 00 70 02 00 e8 b1 43 fb f7 eb 99 0f 1f 44 00 00 0f 0b e9 23 ff ff ff cc cc cc 41 56 41 55 49 89 f5 41 54 <55> 48 89 fd 53 0f 1f 44 00 00 65 44 8b 25 05 e1 a3 76 65 8b 1d ee RSP: 0018:ffffc90015597a10 EFLAGS: 00000246 RAX: 0000000000000000 RBX: ffff8880163dd7c0 RCX: 1ffffffff20aed28 RDX: 1ffff11002c7bd84 RSI: ffffffff8a268920 RDI: ffffffff8a268960 RBP: ffffc90015597b58 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff817ef108 R11: 0000000000000000 R12: ffff8880163dd7ec R13: ffffffff8a268920 R14: 0000000000000001 R15: 0000000000039f80 __schedule+0x7f/0x4940 kernel/sched/core.c:6302 schedule+0xd2/0x1f0 kernel/sched/core.c:6487 schedule_hrtimeout_range_clock+0x343/0x390 kernel/time/hrtimer.c:2296 ep_poll fs/eventpoll.c:1856 [inline] do_epoll_wait+0x1287/0x1930 fs/eventpoll.c:2234 __do_sys_epoll_wait fs/eventpoll.c:2246 [inline] __se_sys_epoll_wait fs/eventpoll.c:2241 [inline] __x64_sys_epoll_wait+0x158/0x270 fs/eventpoll.c:2241 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0x80 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f598ed33e46 Code: 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 11 b8 e8 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 5a c3 90 48 83 ec 28 89 54 24 18 48 89 74 24 RSP: 002b:00007fff554c3cb8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f598ed33e46 RDX: 0000000000000004 RSI: 00007fff554c3cf8 RDI: 0000000000000004 RBP: 00007fff554c3d04 R08: 0000000000000007 R09: 0000560c285706c0 R10: 00000000ffffffff R11: 0000000000000246 R12: 0000560c285db720 R13: 00007fff554c3cf8 R14: 0000000000000001 R15: 0000560c28556910 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: f8 clc 1: 65 48 8b 3c 25 00 70 mov %gs:0x27000,%rdi 8: 02 00 a: e8 b1 43 fb f7 callq 0xf7fb43c0 f: eb 99 jmp 0xffffffaa 11: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 16: 0f 0b ud2 18: e9 23 ff ff ff jmpq 0xffffff40 1d: cc int3 1e: cc int3 1f: cc int3 20: 41 56 push %r14 22: 41 55 push %r13 24: 49 89 f5 mov %rsi,%r13 27: 41 54 push %r12 * 29: 55 push %rbp <-- trapping instruction 2a: 48 89 fd mov %rdi,%rbp 2d: 53 push %rbx 2e: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1) 33: 65 44 8b 25 05 e1 a3 mov %gs:0x76a3e105(%rip),%r12d # 0x76a3e140 3a: 76 3b: 65 gs 3c: 8b .byte 0x8b 3d: 1d .byte 0x1d 3e: ee out %al,(%dx)