INFO: task syz-executor.5:12809 can't die for more than 143 seconds. task:syz-executor.5 state:D stack:28712 pid:12809 ppid: 8485 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4324 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5075 schedule+0xcf/0x270 kernel/sched/core.c:5154 schedule_timeout+0x1db/0x250 kernel/time/timer.c:1868 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x168/0x270 kernel/sched/completion.c:138 io_sq_thread_finish+0x96/0x580 fs/io_uring.c:7143 io_sq_offload_create fs/io_uring.c:7909 [inline] io_uring_create fs/io_uring.c:9441 [inline] io_uring_setup+0x1fb2/0x2c20 fs/io_uring.c:9526 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465ef9 RSP: 002b:00007f6ab39f7188 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465ef9 RDX: 0000000000000000 RSI: 00000000200002c0 RDI: 0000000000003072 RBP: 00000000004bcd1c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007fff7f8869df R14: 00007f6ab39f7300 R15: 0000000000022000 INFO: task syz-executor.5:12809 blocked for more than 143 seconds. Not tainted 5.11.0-next-20210224-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:28712 pid:12809 ppid: 8485 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4324 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5075 schedule+0xcf/0x270 kernel/sched/core.c:5154 schedule_timeout+0x1db/0x250 kernel/time/timer.c:1868 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x168/0x270 kernel/sched/completion.c:138 io_sq_thread_finish+0x96/0x580 fs/io_uring.c:7143 io_sq_offload_create fs/io_uring.c:7909 [inline] io_uring_create fs/io_uring.c:9441 [inline] io_uring_setup+0x1fb2/0x2c20 fs/io_uring.c:9526 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465ef9 RSP: 002b:00007f6ab39f7188 EFLAGS: 00000246 ORIG_RAX: 00000000000001a9 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465ef9 RDX: 0000000000000000 RSI: 00000000200002c0 RDI: 0000000000003072 RBP: 00000000004bcd1c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf60 R13: 00007fff7f8869df R14: 00007f6ab39f7300 R15: 0000000000022000 INFO: task iou-sqp-12809:12815 can't die for more than 143 seconds. task:iou-sqp-12809 state:D stack:30296 pid:12815 ppid: 8485 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4324 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5075 schedule+0xcf/0x270 kernel/sched/core.c:5154 schedule_timeout+0x1db/0x250 kernel/time/timer.c:1868 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x168/0x270 kernel/sched/completion.c:138 io_sq_thread+0x27d/0x19a0 fs/io_uring.c:6722 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INFO: task iou-sqp-12809:12815 blocked for more than 143 seconds. Not tainted 5.11.0-next-20210224-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:iou-sqp-12809 state:D stack:30296 pid:12815 ppid: 8485 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4324 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5075 schedule+0xcf/0x270 kernel/sched/core.c:5154 schedule_timeout+0x1db/0x250 kernel/time/timer.c:1868 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x168/0x270 kernel/sched/completion.c:138 io_sq_thread+0x27d/0x19a0 fs/io_uring.c:6722 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Showing all locks held in the system: 1 lock held by khungtaskd/1658: #0: ffffffff8bf744a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6327 1 lock held by in:imklog/8107: #0: ffff888014cb0af0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:961 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1658 Comm: khungtaskd Not tainted 5.11.0-next-20210224-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0xfa/0x151 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:147 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:253 [inline] watchdog+0xd8e/0xf40 kernel/hung_task.c:338 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 1790 Comm: kworker/0:2 Not tainted 5.11.0-next-20210224-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_power_efficient gc_worker RIP: 0010:lockdep_hardirqs_on+0x53/0x100 kernel/locking/lockdep.c:4222 Code: fd 75 41 65 8b 05 5d b6 fd 76 85 c0 75 69 65 8b 05 4e b3 fd 76 85 c0 75 5e 8b 35 68 53 e0 06 85 f6 75 21 9c 58 f6 c4 02 75 7a <8b> 15 57 53 e0 06 85 d2 75 10 48 8b 83 88 09 00 00 48 39 83 70 09 RSP: 0018:ffffc90006f9fc88 EFLAGS: 00000046 RAX: 0000000000000046 RBX: ffff8880151a1c00 RCX: 1ffffffff1f5e642 RDX: 0000000000000007 RSI: 0000000000000000 RDI: ffffffff873fcb02 RBP: ffffffff873fcb02 R08: 0000000000000001 R09: ffffffff8fabc8f7 R10: 0000000000000001 R11: 0000000000000000 R12: dffffc0000000000 R13: 0000000000010000 R14: 0000000000000000 R15: 0000000000000200 FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007faa581f7000 CR3: 0000000017e09000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: seqcount_lockdep_reader_access include/linux/seqlock.h:105 [inline] nf_conntrack_get_ht include/net/netfilter/nf_conntrack.h:312 [inline] gc_worker+0x892/0xc40 net/netfilter/nf_conntrack_core.c:1374 process_one_work+0x98d/0x1600 kernel/workqueue.c:2275 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294