INFO: task syz-executor.2:10448 blocked for more than 143 seconds. Not tainted 5.12.0-rc2-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:27048 pid:10448 ppid: 8403 flags:0x00024004 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 io_uring_cancel_files fs/io_uring.c:8699 [inline] io_uring_cancel_task_requests+0x9d9/0xc40 fs/io_uring.c:8730 __io_uring_files_cancel+0x110/0x1b0 fs/io_uring.c:8816 io_uring_files_cancel include/linux/io_uring.h:47 [inline] do_exit+0x299/0x2a60 kernel/exit.c:780 do_group_exit+0x125/0x310 kernel/exit.c:922 get_signal+0x42c/0x2100 kernel/signal.c:2773 arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:811 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x465fb2 RSP: 002b:00007fe2e807e0f8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009 RAX: 00000000206d4000 RBX: 0000000000008011 RCX: 0000000000465fb2 RDX: 0000000000000003 RSI: 0000000000004000 RDI: 00000000206d4000 RBP: 00000000206d4000 R08: 0000000000000004 R09: 0000000010000000 R10: 0000000000008011 R11: 0000000000000206 R12: 0000000020000180 R13: 00000000206d4000 R14: 00000000200001c0 R15: 0000000020ee7000 Showing all locks held in the system: 1 lock held by khungtaskd/1652: #0: ffffffff8bf74220 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6327 1 lock held by in:imklog/8167: #0: ffff888013cc9270 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:961 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1652 Comm: khungtaskd Not tainted 5.12.0-rc2-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+0x141/0x1d7 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:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0xd48/0xfb0 kernel/hung_task.c:294 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: 4835 Comm: systemd-journal Not tainted 5.12.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:hlist_bl_first_rcu include/linux/rculist_bl.h:24 [inline] RIP: 0010:__d_lookup_rcu+0xcd/0x6c0 fs/dcache.c:2296 Code: ff 8b 54 24 08 44 89 e1 48 8b 05 8e 32 fc 0b d3 ea 48 8d 1c d0 48 b8 00 00 00 00 00 fc ff df 48 89 da 48 c1 ea 03 80 3c 02 00 <0f> 85 59 05 00 00 4c 8b 2b e8 85 a4 37 07 31 ff 41 89 c4 89 c6 e8 RSP: 0018:ffffc9000163f800 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: ffffc90000751010 RCX: 000000000000000c RDX: 1ffff920000ea202 RSI: ffffffff81c93c54 RDI: 0000000000000003 RBP: ffffc9000163fc58 R08: 000000000000001f R09: 0000000000000030 R10: ffffffff81c93c45 R11: 0000000000000000 R12: 000000000000000c R13: 0000000000000040 R14: ffff888019bd9028 R15: ffffc9000163fc90 FS: 00007f88a08a68c0(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f889dcbc020 CR3: 0000000025a33000 CR4: 0000000000350ef0 Call Trace: lookup_fast+0xe1/0x6d0 fs/namei.c:1549 walk_component+0xc6/0x6a0 fs/namei.c:1935 link_path_walk.part.0+0x712/0xc90 fs/namei.c:2266 link_path_walk fs/namei.c:2191 [inline] path_openat+0x25a/0x27e0 fs/namei.c:3494 do_filp_open+0x17e/0x3c0 fs/namei.c:3525 do_sys_openat2+0x16d/0x420 fs/open.c:1187 do_sys_open fs/open.c:1203 [inline] __do_sys_open fs/open.c:1211 [inline] __se_sys_open fs/open.c:1207 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1207 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f889fe35840 Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 RSP: 002b:00007fff083b9f18 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007fff083ba220 RCX: 00007f889fe35840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 000055ceaf94ece0 RBP: 000000000000000d R08: 000000000000c0ff R09: 00000000ffffffff R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff R13: 000055ceaf943040 R14: 00007fff083ba1e0 R15: 000055ceaf94eb00