BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 176s! BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=-20 stuck for 187s! Showing busy workqueues and worker pools: workqueue events: flags=0x0 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=2/256 in-flight: 6240:destroy_super_work pending: free_obj_work workqueue events_long: flags=0x0 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 pending: gc_worker workqueue events_power_efficient: flags=0x80 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 pending: neigh_periodic_work workqueue mm_percpu_wq: flags=0x8 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 pending: vmstat_update workqueue kblockd: flags=0x18 pwq 3: cpus=1 node=0 flags=0x0 nice=-20 active=1/256 pending: blk_mq_requeue_work workqueue dm_bufio_cache: flags=0x8 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 pending: work_fn pool 2: cpus=1 node=0 flags=0x0 nice=0 hung=176s workers=5 idle: 18 68 73 72 INFO: task jbd2/sda1-8:76 blocked for more than 140 seconds. Not tainted 4.14.71+ #8 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. jbd2/sda1-8 D27224 76 2 0x80000000 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 io_schedule+0x1c/0x70 kernel/sched/core.c:5097 bit_wait_io+0x9/0x90 kernel/sched/wait_bit.c:249 __wait_on_bit+0xad/0x130 kernel/sched/wait_bit.c:51 out_of_line_wait_on_bit+0xd1/0x100 kernel/sched/wait_bit.c:64 wait_on_bit_io include/linux/wait_bit.h:106 [inline] __wait_on_buffer+0x58/0x70 fs/buffer.c:125 wait_on_buffer include/linux/buffer_head.h:354 [inline] journal_wait_on_commit_record fs/jbd2/commit.c:177 [inline] jbd2_journal_commit_transaction+0x484a/0x648c fs/jbd2/commit.c:868 kjournald2+0x244/0x820 fs/jbd2/journal.c:233 kthread+0x348/0x420 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402 INFO: task syz-executor0:13807 blocked for more than 140 seconds. Not tainted 4.14.71+ #8 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D27816 13807 1851 0x00000004 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 jbd2_log_wait_commit+0x2a5/0x3f0 fs/jbd2/journal.c:730 jbd2_complete_transaction+0x157/0x1b0 fs/jbd2/journal.c:768 ext4_fallocate+0x572/0x1c80 fs/ext4/extents.c:4994 vfs_fallocate+0x346/0x700 fs/open.c:328 SYSC_fallocate fs/open.c:351 [inline] SyS_fallocate+0x4b/0x80 fs/open.c:345 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x457679 RSP: 002b:00007fbd7f01dc78 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007fbd7f01e6d4 RCX: 0000000000457679 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000005 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000010000101 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004cc868 R14: 00000000004bddb5 R15: 0000000000000000 INFO: task syz-executor0:13811 blocked for more than 140 seconds. Not tainted 4.14.71+ #8 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D29768 13811 1851 0x00000004 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:565 [inline] rwsem_down_write_failed+0x390/0x730 kernel/locking/rwsem-xadd.c:594 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:105 __down_write arch/x86/include/asm/rwsem.h:126 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:56 inode_lock include/linux/fs.h:713 [inline] ext4_file_write_iter+0x1fd/0xe20 fs/ext4/file.c:233 call_write_iter include/linux/fs.h:1782 [inline] new_sync_write fs/read_write.c:471 [inline] __vfs_write+0x417/0x5c0 fs/read_write.c:484 vfs_write+0x17f/0x4d0 fs/read_write.c:546 SYSC_pwrite64 fs/read_write.c:635 [inline] SyS_pwrite64+0x136/0x160 fs/read_write.c:622 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x457679 RSP: 002b:00007fbd7effcc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000012 RAX: ffffffffffffffda RBX: 00007fbd7effd6d4 RCX: 0000000000457679 RDX: 00000000000000f8 RSI: 0000000020000280 RDI: 0000000000000003 RBP: 000000000072bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d4a70 R14: 00000000004c31cb R15: 0000000000000001 INFO: task syz-executor0:13816 blocked for more than 140 seconds. Not tainted 4.14.71+ #8 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D29592 13816 1851 0x00000004 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:565 [inline] rwsem_down_write_failed+0x390/0x730 kernel/locking/rwsem-xadd.c:594 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:105 __down_write arch/x86/include/asm/rwsem.h:126 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:56 inode_lock include/linux/fs.h:713 [inline] do_truncate2+0xfd/0x1c0 fs/open.c:61 handle_truncate fs/namei.c:2998 [inline] do_last fs/namei.c:3417 [inline] path_openat+0xaea/0x23a0 fs/namei.c:3550 do_filp_open+0x197/0x270 fs/namei.c:3584 do_sys_open+0x2ef/0x580 fs/open.c:1071 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x457679 RSP: 002b:00007fbd7efdbc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007fbd7efdc6d4 RCX: 0000000000457679 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000700 RBP: 000000000072c040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004cc688 R14: 00000000004bdcdc R15: 0000000000000002 INFO: task syz-executor0:13820 blocked for more than 140 seconds. Not tainted 4.14.71+ #8 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D28824 13820 1851 0x00000004 Call Trace: schedule+0x7f/0x1b0 kernel/sched/core.c:3490 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:565 [inline] rwsem_down_write_failed+0x390/0x730 kernel/locking/rwsem-xadd.c:594 call_rwsem_down_write_failed+0x13/0x20 arch/x86/lib/rwsem.S:105 __down_write arch/x86/include/asm/rwsem.h:126 [inline] down_write+0x4f/0x90 kernel/locking/rwsem.c:56 inode_lock include/linux/fs.h:713 [inline] ext4_fallocate+0x1dd/0x1c80 fs/ext4/extents.c:4965 vfs_fallocate+0x346/0x700 fs/open.c:328 SYSC_fallocate fs/open.c:351 [inline] SyS_fallocate+0x4b/0x80 fs/open.c:345 do_syscall_64+0x19b/0x4b0 arch/x86/entry/common.c:289 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x457679 RSP: 002b:00007fbd7ef99c78 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007fbd7ef9a6d4 RCX: 0000000000457679 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000008 RBP: 000000000072c180 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000010000101 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004cc868 R14: 00000000004bddb5 R15: 0000000000000004 Showing all locks held in the system: 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x74/0x20f kernel/locking/lockdep.c:4541 2 locks held by getty/1761: #0: (&tty->ldisc_sem){++++}, at: [] tty_ldisc_ref_wait+0x20/0x80 drivers/tty/tty_ldisc.c:275 #1: (&ldata->atomic_read_lock){+.+.}, at: [] n_tty_read+0x1ff/0x15e0 drivers/tty/n_tty.c:2142 2 locks held by syz-executor0/13807: #0: (sb_writers#4){.+.+}, at: [] file_start_write include/linux/fs.h:2722 [inline] #0: (sb_writers#4){.+.+}, at: [] vfs_fallocate+0x4dd/0x700 fs/open.c:327 #1: (&sb->s_type->i_mutex_key#10){++++}, at: [] inode_lock include/linux/fs.h:713 [inline] #1: (&sb->s_type->i_mutex_key#10){++++}, at: [] ext4_fallocate+0x1dd/0x1c80 fs/ext4/extents.c:4965 2 locks held by syz-executor0/13811: #0: (sb_writers#4){.+.+}, at: [] file_start_write include/linux/fs.h:2722 [inline] #0: (sb_writers#4){.+.+}, at: [] vfs_write+0x3d7/0x4d0 fs/read_write.c:545 #1: (&sb->s_type->i_mutex_key#10){++++}, at: [] inode_lock include/linux/fs.h:713 [inline] #1: (&sb->s_type->i_mutex_key#10){++++}, at: [] ext4_file_write_iter+0x1fd/0xe20 fs/ext4/file.c:233 2 locks held by syz-executor0/13816: #0: (sb_writers#4){.+.+}, at: [] sb_start_write include/linux/fs.h:1543 [inline] #0: (sb_writers#4){.+.+}, at: [] mnt_want_write+0x3a/0xa0 fs/namespace.c:387 #1: (&sb->s_type->i_mutex_key#10){++++}, at: [] inode_lock include/linux/fs.h:713 [inline] #1: (&sb->s_type->i_mutex_key#10){++++}, at: [] do_truncate2+0xfd/0x1c0 fs/open.c:61 2 locks held by syz-executor0/13820: #0: (sb_writers#4){.+.+}, at: [] file_start_write include/linux/fs.h:2722 [inline] #0: (sb_writers#4){.+.+}, at: [] vfs_fallocate+0x4dd/0x700 fs/open.c:327 #1: (&sb->s_type->i_mutex_key#10){++++}, at: [] inode_lock include/linux/fs.h:713 [inline] #1: (&sb->s_type->i_mutex_key#10){++++}, at: [] ext4_fallocate+0x1dd/0x1c80 fs/ext4/extents.c:4965 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 23 Comm: khungtaskd Not tainted 4.14.71+ #8 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xb9/0x11b lib/dump_stack.c:53 nmi_cpu_backtrace.cold.0+0x47/0x85 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x121/0x146 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline] watchdog+0x574/0xa70 kernel/hung_task.c:252 kthread+0x348/0x420 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:402 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 13597 Comm: syz-executor4 Not tainted 4.14.71+ #8 task: ffff8801a1ad4680 task.stack: ffff8801c43c0000 RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 RSP: 0018:ffff8801c43c7c80 EFLAGS: 00000286 RAX: ffff8801a1ad4680 RBX: 0000000000050000 RCX: 0000000000050000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8801c43c7fa8 RBP: 1ffff10038878f92 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 00000000000000ca R13: ffff8801d44f9c30 R14: ffff8801a1ad4680 R15: fffffffffffff001 FS: 00007f792029d700(0000) GS:ffff8801dbb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000001dcd978 CR3: 00000001c924e002 CR4: 00000000001606a0 DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __seccomp_filter+0x1d0/0xce0 kernel/seccomp.c:770 __secure_computing+0x9c/0x310 kernel/seccomp.c:798 syscall_trace_enter+0x506/0xc10 arch/x86/entry/common.c:120 do_syscall_64+0x331/0x4b0 arch/x86/entry/common.c:280 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x457679 RSP: 002b:00007f792029ccf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffff001 RBX: 000000000072bf08 RCX: 0000000000457679 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000072bf08 RBP: 000000000072bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000072bf0c R13: 00007ffdd98c5e0f R14: 00007f792029d9c0 R15: 0000000000000000 Code: ff ff 48 89 df e8 b1 f8 21 00 e9 9f fe ff ff 4c 89 e7 e8 a4 f8 21 00 e9 2c fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <65> 48 8b 04 25 c0 de 01 00 48 85 c0 74 1a 65 8b 15 2b 25 11 6e