INFO: task syz-executor.5:8470 blocked for more than 143 seconds. Not tainted 5.5.0-rc1-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D27672 8470 7101 0x00000004 Call Trace: schedule+0xc4/0x2b0 kernel/sched/core.c:4155 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:4214 __mutex_lock_common kernel/locking/mutex.c:1036 [inline] __mutex_lock+0x8a0/0x13e0 kernel/locking/mutex.c:1106 __pipe_lock fs/pipe.c:86 [inline] pipe_release+0x42/0x1b0 fs/pipe.c:680 __fput+0x256/0x780 fs/file_table.c:280 task_work_run+0x103/0x180 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:188 [inline] exit_to_usermode_loop+0x23d/0x2d0 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:195 [inline] syscall_return_slowpath arch/x86/entry/common.c:278 [inline] do_syscall_64+0x4f8/0x5e0 arch/x86/entry/common.c:304 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x415ee1 Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 1b 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01 RSP: 002b:00007ffd02984160 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000007 RCX: 0000000000415ee1 RDX: 0000000000000000 RSI: 00000000007904d0 RDI: 0000000000000006 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 00007ffd02984250 R11: 0000000000000293 R12: 00000000007905a8 R13: 000000000000ca93 R14: ffffffffffffffff R15: 000000000078bfac Showing all locks held in the system: 2 locks held by kworker/u4:7/450: #0: ffff8880ae837398 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1215 [inline] #0: ffff8880ae837398 (&rq->lock){-.-.}, at: __schedule+0x23c/0x1970 kernel/sched/core.c:4029 #1: ffffffff8899a280 (rcu_read_lock){....}, at: trace_sched_stat_runtime include/trace/events/sched.h:435 [inline] #1: ffffffff8899a280 (rcu_read_lock){....}, at: update_curr+0x302/0x8c0 kernel/sched/fair.c:859 1 lock held by khungtaskd/1059: #0: ffffffff8899a280 (rcu_read_lock){....}, at: debug_show_all_locks+0x52/0x28d kernel/locking/lockdep.c:5332 1 lock held by in:imklog/6480: #0: ffff88809a855b60 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x96/0xb0 fs/file.c:801 1 lock held by syz-executor.5/8470: #0: ffff888088f32060 (&pipe->mutex/1){+.+.}, at: __pipe_lock fs/pipe.c:86 [inline] #0: ffff888088f32060 (&pipe->mutex/1){+.+.}, at: pipe_release+0x42/0x1b0 fs/pipe.c:680 3 locks held by syz-executor.5/8478: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1059 Comm: khungtaskd Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x128/0x182 lib/dump_stack.c:118 nmi_cpu_backtrace.cold.7+0x4b/0x83 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x183/0x1ac lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0x629/0xc70 kernel/hung_task.c:289 kthread+0x31d/0x3e0 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 8478 Comm: syz-executor.5 Not tainted 5.5.0-rc1-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:iov_iter_alignment+0x287/0x670 lib/iov_iter.c:1234 Code: 48 89 ce 44 89 f5 31 c0 48 c1 ee 03 45 31 f6 41 b8 00 10 00 00 49 bf 00 00 00 00 00 fc ff df 4c 01 fe 85 ed 0f 84 b7 fe ff ff <80> 3e 00 0f 85 12 03 00 00 45 89 f4 49 c1 e4 04 4d 01 ec 49 8d 7c RSP: 0018:ffffc900046875d0 EFLAGS: 00000206 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc90004687ce8 RDX: 0000000000000000 RSI: fffff520008d0f9d RDI: 0000000000000000 RBP: 0000000000001000 R08: 0000000000001000 R09: 0000000000000000 R10: 0000000000001000 R11: ffff8880ae838223 R12: ffff8880a7163000 R13: ffff8880a7163000 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007fc6341f2700(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f76b1d6e000 CR3: 000000009662d000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: iomap_dio_bio_actor+0x15b/0xd60 fs/iomap/direct-io.c:203 iomap_apply+0x1e7/0x930 fs/iomap/apply.c:80 iomap_dio_rw+0x840/0xe70 fs/iomap/direct-io.c:498 ext4_dio_write_iter fs/ext4/file.c:438 [inline] ext4_file_write_iter+0x559/0x1610 fs/ext4/file.c:545 call_write_iter include/linux/fs.h:1902 [inline] do_iter_readv_writev+0x4e5/0x7b0 fs/read_write.c:693 do_iter_write+0x123/0x530 fs/read_write.c:970 iter_file_splice_write+0x550/0xa20 fs/splice.c:760 do_splice_from fs/splice.c:863 [inline] do_splice+0x949/0x1500 fs/splice.c:1170 __do_sys_splice fs/splice.c:1447 [inline] __se_sys_splice fs/splice.c:1427 [inline] __x64_sys_splice+0x236/0x2c0 fs/splice.c:1427 do_syscall_64+0xc6/0x5e0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45c369 Code: 8d b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 5b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fc6341f1c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000113 RAX: ffffffffffffffda RBX: 0000000000032240 RCX: 000000000045c369 RDX: 0000000000000003 RSI: 0000000000000000 RDI: 0000000000000005 RBP: 000000000078bff8 R08: 000000000000ffe0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078bfac R13: 00007ffd029840ef R14: 00007fc6341f29c0 R15: 000000000078bfac