[13033] 0 13033 18244 8754 26 4 0 0 syz-executor.4 [13402] 0 13402 18178 8716 25 3 0 0 syz-executor.1 [13432] 0 13432 18211 8720 25 3 0 0 syz-executor.4 [13435] 0 13435 18277 8724 26 3 0 0 syz-executor.4 INFO: task syz-executor.1:22951 blocked for more than 140 seconds. [13438] 0 13438 18244 8723 25 3 0 0 syz-executor.1 Not tainted 4.14.129+ #11 [13451] 0 13451 18178 8749 27 4 0 0 syz-executor.1 [13499] 0 13499 18145 8746 25 4 0 0 syz-executor.4 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D26552 22951 8761 0x00000004 [13617] 0 13617 18234 8754 27 4 0 0 syz-executor.1 Call Trace: [13830] 0 13830 18211 8750 26 4 0 0 syz-executor.5 schedule+0x92/0x1c0 kernel/sched/core.c:3498 [13834] 0 13834 18211 8750 26 4 0 0 syz-executor.5 [13889] 0 13889 18178 8748 27 4 0 0 syz-executor.5 __lock_sock+0x12b/0x220 net/core/sock.c:2238 lock_sock_nested+0xe1/0x100 net/core/sock.c:2762 [13905] 0 13905 18211 8763 28 4 0 0 syz-executor.5 lock_sock include/net/sock.h:1462 [inline] sk_wait_data+0x1df/0x400 net/core/sock.c:2304 [13941] 0 13941 18178 8748 26 4 0 0 syz-executor.5 [13947] 0 13947 18178 8747 26 4 0 0 syz-executor.5 tcp_splice_read+0x352/0xa00 net/ipv4/tcp.c:814 [14049] 0 14049 18244 8751 26 4 0 0 syz-executor.5 sock_splice_read+0xa9/0xe0 net/socket.c:883 [14086] 0 14086 18211 8749 26 4 0 0 syz-executor.5 [14205] 0 14205 18145 8749 26 4 0 0 syz-executor.4 do_splice_to+0xfd/0x150 fs/splice.c:880 do_splice fs/splice.c:1173 [inline] SYSC_splice fs/splice.c:1402 [inline] SyS_splice+0xf54/0x1270 fs/splice.c:1382 [14234] 0 14234 18277 8756 26 4 0 0 syz-executor.1 [14236] 0 14236 18145 8715 25 3 0 0 syz-executor.4 [14299] 0 14299 18244 11620 31 4 0 0 syz-executor.1 do_syscall_64+0x19b/0x510 arch/x86/entry/common.c:292 Showing all locks held in the system: 2 locks held by kworker/u4:0/5: #0: ("events_unbound"){+.+.}, at: [<000000008b178aea>] process_one_work+0x6e5/0x1510 kernel/workqueue.c:2105 #1: ((&sub_info->work)){+.+.}, at: [<000000001ebbfe72>] process_one_work+0x71b/0x1510 kernel/workqueue.c:2109 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.?}, at: [<00000000f2bff59b>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4541 2 locks held by getty/1753: #0: (&tty->ldisc_sem){++++}, at: [<0000000039abd257>] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000c0539bc9>] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156 2 locks held by kworker/u4:39/1282: #0: ("events_unbound"){+.+.}, at: [<000000008b178aea>] process_one_work+0x6e5/0x1510 kernel/workqueue.c:2105 #1: ((&sub_info->work)){+.+.}, at: [<000000001ebbfe72>] process_one_work+0x71b/0x1510 kernel/workqueue.c:2109 1 lock held by blkid/21881: #0: (&ei->i_mmap_sem){++++}, at: [<00000000ffdfe8af>] ext4_filemap_fault+0x7c/0xb0 fs/ext4/inode.c:6178 1 lock held by syz-executor.1/22951: #0: (&pipe->mutex/1){+.+.}, at: [<000000005de32eba>] pipe_lock_nested fs/pipe.c:67 [inline] #0: (&pipe->mutex/1){+.+.}, at: [<000000005de32eba>] pipe_lock+0x58/0x70 fs/pipe.c:75 ============================================= [14306] 0 14306 18145 8746 26 4 0 0 syz-executor.5 [14315] 0 14315 18244 8752 26 4 0 0 syz-executor.1 [14345] 0 14345 18244 8752 26 4 0 0 syz-executor.1 [14418] 0 14418 18178 8749 26 4 0 0 syz-executor.1 [14445] 0 14445 18145 8747 26 4 0 0 syz-executor.4 [14969] 0 14969 18211 8750 26 4 0 0 syz-executor.1 [15238] 0 15238 18244 8752 26 4 0 0 syz-executor.1 [15254] 0 15254 18244 8752 26 4 0 0 syz-executor.1 [15446] 0 15446 18211 8749 27 4 0 0 syz-executor.0 [15516] 0 15516 18234 8754 27 4 0 0 syz-executor.4 [16106] 0 16106 18234 8754 27 4 0 0 syz-executor.1 [16407] 0 16407 18145 8745 26 4 0 0 syz-executor.0 [16415] 0 16415 18211 8750 26 4 0 0 syz-executor.1 NMI backtrace for cpu 1 CPU: 1 PID: 23 Comm: khungtaskd Not tainted 4.14.129+ #11 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x10e lib/dump_stack.c:53 nmi_cpu_backtrace.cold+0x47/0x86 lib/nmi_backtrace.c:101 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 1625 Comm: rsyslogd Not tainted 4.14.129+ #11 task: 000000007a9bf70a task.stack: 00000000c1b51a1c RIP: 0010:perf_trace_lock+0x31b/0x4e0 include/trace/events/lock.h:39 RSP: 0000:ffff8881d4857048 EFLAGS: 00000086 RAX: dffffc0000000000 RBX: ffffe8ffffc0bc10 RCX: 0000000000000005 RDX: 1ffffd1ffff81782 RSI: 1ffffffff1ed4e84 RDI: ffffffff8f6a7420 RBP: ffff8881d4857120 R08: 0000000000000000 R09: 0000000000000000 R10: ffff8881d4d22000 R11: 0000000000000001 R12: ffffed103a90ae0f R13: 0000000000000000 R14: ffffffff8f8c0760 R15: ffff8881d48570f8 FS: 00007f159b9eb700(0000) GS:ffff8881dba00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000c677d8 CR3: 00000001d615a003 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: trace_lock_release include/trace/events/lock.h:58 [inline] lock_release+0x4d8/0x730 kernel/locking/lockdep.c:4009 Code: 01 00 00 00 4d 8b 4f c0 49 89 42 10 6a 00 53 e8 ec a0 21 00 58 5a 48 b8 00 00 00 00 00 fc ff df 49 01 c4 49 c7 04 24 00 00 00 00 <41> c7 44 24 08 00 00 00 00 48 8b 45 d0 65 48 33 04 25 28 00 00 [16437] 0 16437 18211 8749 26 4 0 0 syz-executor.5