INFO: task syz-executor.1:29142 can't die for more than 143 seconds. task:syz-executor.1 state:D stack:28200 pid:29142 ppid: 8410 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4353 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5104 schedule+0xcf/0x270 kernel/sched/core.c:5183 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+0xa2/0x650 fs/io_uring.c:7089 io_sq_offload_create fs/io_uring.c:7879 [inline] io_uring_create fs/io_uring.c:9355 [inline] io_uring_setup+0x225f/0x2910 fs/io_uring.c:9438 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465f69 RSP: 002b:00007f0a0f0ba108 EFLAGS: 00000202 ORIG_RAX: 00000000000001a9 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465f69 RDX: 0000000020ffd000 RSI: 0000000020000000 RDI: 0000000000006676 RBP: 0000000020000000 R08: 00000000200000c0 R09: 00000000200000c0 R10: 0000000020000080 R11: 0000000000000202 R12: 00000000200000c0 R13: 0000000020ffd000 R14: 0000000020000080 R15: 0000000020ffc000 INFO: task syz-executor.1:29142 blocked for more than 143 seconds. Not tainted 5.12.0-rc1-next-20210305-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:28200 pid:29142 ppid: 8410 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4353 [inline] __schedule+0x90c/0x21a0 kernel/sched/core.c:5104 schedule+0xcf/0x270 kernel/sched/core.c:5183 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+0xa2/0x650 fs/io_uring.c:7089 io_sq_offload_create fs/io_uring.c:7879 [inline] io_uring_create fs/io_uring.c:9355 [inline] io_uring_setup+0x225f/0x2910 fs/io_uring.c:9438 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465f69 RSP: 002b:00007f0a0f0ba108 EFLAGS: 00000202 ORIG_RAX: 00000000000001a9 RAX: ffffffffffffffda RBX: 000000000056bf60 RCX: 0000000000465f69 RDX: 0000000020ffd000 RSI: 0000000020000000 RDI: 0000000000006676 RBP: 0000000020000000 R08: 00000000200000c0 R09: 00000000200000c0 R10: 0000000020000080 R11: 0000000000000202 R12: 00000000200000c0 R13: 0000000020ffd000 R14: 0000000020000080 R15: 0000000020ffc000 Showing all locks held in the system: 2 locks held by kworker/u4:5/195: 1 lock held by khungtaskd/1665: #0: ffffffff8bf73ee0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6332 1 lock held by in:imklog/8105: #0: ffff8880190ddc70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:961 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1665 Comm: khungtaskd Not tainted 5.12.0-rc1-next-20210305-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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 4838 Comm: systemd-journal Not tainted 5.12.0-rc1-next-20210305-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:unwind_next_frame+0x4c/0x2000 arch/x86/kernel/unwind_orc.c:418 Code: 40 b3 8a b5 41 48 8d 5c 24 40 48 c7 44 24 48 d1 57 eb 8a 48 c1 eb 03 48 c7 44 24 50 b0 19 32 81 48 8d 14 03 c7 02 f1 f1 f1 f1 42 04 00 f3 f3 f3 48 89 fa 65 48 8b 34 25 28 00 00 00 48 89 b4 RSP: 0018:ffffc900015cf7b8 EFLAGS: 00000a06 RAX: dffffc0000000000 RBX: 1ffff920002b9eff RCX: 0000000000000000 RDX: fffff520002b9eff RSI: ffffffff89027dcd RDI: ffffc900015cf890 RBP: ffffc900015cf918 R08: ffffffff8e49861a R09: 0000000000000001 R10: 0000000000084087 R11: 0000000000000001 R12: ffffc900015cf948 R13: 0000000000000000 R14: ffff888025819c00 R15: ffffc900015cf890 FS: 00007f773ee5e8c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f773c353000 CR3: 0000000012455000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357 ____kasan_slab_free mm/kasan/common.c:360 [inline] ____kasan_slab_free mm/kasan/common.c:325 [inline] __kasan_slab_free+0xf5/0x130 mm/kasan/common.c:367 kasan_slab_free include/linux/kasan.h:199 [inline] slab_free_hook mm/slub.c:1562 [inline] slab_free_freelist_hook+0x72/0x1b0 mm/slub.c:1600 slab_free mm/slub.c:3161 [inline] kmem_cache_free+0x8b/0x730 mm/slub.c:3177 putname+0xe1/0x120 fs/namei.c:259 filename_lookup+0x3b1/0x560 fs/namei.c:2463 user_path_at include/linux/namei.h:60 [inline] do_faccessat+0x127/0x850 fs/open.c:425 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f773e1199c7 Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007fff75d9a418 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00007fff75d9d330 RCX: 00007f773e1199c7 RDX: 00007f773eb8aa00 RSI: 0000000000000000 RDI: 000055a7e36ea9a3 RBP: 00007fff75d9a450 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fff75d9d330 R15: 00007fff75d9a940