NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 NOHZ: local_softirq_pending 08 INFO: task syz-executor.4:23780 blocked for more than 140 seconds. Not tainted 4.14.178-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D27072 23780 6354 0x00000004 Call Trace: schedule+0x8d/0x1b0 kernel/sched/core.c:3428 xlog_grant_head_wait+0x135/0xc10 fs/xfs/xfs_log.c:274 xlog_grant_head_check+0x34c/0x390 fs/xfs/xfs_log.c:336 xfs_log_reserve+0x2fb/0x9f0 fs/xfs/xfs_log.c:465 xfs_log_unmount_write fs/xfs/xfs_log.c:869 [inline] xfs_log_quiesce+0x2ec/0x980 fs/xfs/xfs_log.c:995 xfs_log_unmount+0x1d/0xb0 fs/xfs/xfs_log.c:1009 xfs_log_mount_cancel+0x40/0x50 fs/xfs/xfs_log.c:812 xfs_mountfs+0x1192/0x1f10 fs/xfs/xfs_mount.c:1031 xfs_fs_fill_super+0xb7a/0x1380 fs/xfs/xfs_super.c:1688 mount_bdev+0x2bc/0x370 fs/super.c:1134 mount_fs+0x92/0x2a0 fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x3c0 fs/namespace.c:1046 vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2549 [inline] do_mount+0x3c9/0x24f0 fs/namespace.c:2879 SYSC_mount fs/namespace.c:3095 [inline] SyS_mount+0xa8/0x120 fs/namespace.c:3072 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45f27a RSP: 002b:00007f78f85c4a68 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000005087c0 RCX: 000000000045f27a RDX: 00007f78f85c4ae0 RSI: 0000000020000140 RDI: 00007f78f85c4b00 RBP: 000000000078bf00 R08: 00007f78f85c4b40 R09: 00007f78f85c4ae0 R10: 0000000000000000 R11: 0000000000000206 R12: 00000000ffffffff R13: 0000000000000bf2 R14: 00000000004ce170 R15: 00007f78f85c56d4 Showing all locks held in the system: 1 lock held by khungtaskd/1057: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 1 lock held by syz-executor.4/23780: #0: (&type->s_umount_key#66/1){+.+.}, at: [] alloc_super fs/super.c:251 [inline] #0: (&type->s_umount_key#66/1){+.+.}, at: [] sget_userns+0x556/0xc30 fs/super.c:516 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1057 Comm: khungtaskd Not tainted 4.14.178-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x13e/0x194 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x139/0x17e lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x5e2/0xb80 kernel/hung_task.c:274 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 5967 Comm: rs:main Q:Reg Not tainted 4.14.178-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff888092742680 task.stack: ffff88808fdc0000 RIP: 0010:ext4_journal_check_start+0xdb/0x1e0 fs/ext4/ext4_jbd2.c:53 RSP: 0018:ffff88808fdc7a48 EFLAGS: 00000297 RAX: 0000000000000000 RBX: ffff88809a78c480 RCX: 1ffffffff10279fc RDX: 1ffff11042a84165 RSI: ffffffff87d842e0 RDI: ffff888215420b28 RBP: ffff888215420840 R08: 0000000000000000 R09: 0000000000000000 R10: ffff888092742f58 R11: 0000000000000000 R12: 0000000000000000 R13: ffff888215420840 R14: 0000000000000001 R15: ffff8880851d34f0 FS: 00007f1cb975f700(0000) GS:ffff8880aeb00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe2d9c54798 CR3: 000000008d408000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __ext4_journal_start_sb+0x70/0x440 fs/ext4/ext4_jbd2.c:74 __ext4_journal_start fs/ext4/ext4_jbd2.h:314 [inline] ext4_dirty_inode+0x51/0x90 fs/ext4/inode.c:5990 __mark_inode_dirty+0x535/0x1020 fs/fs-writeback.c:2144 generic_update_time+0x1b0/0x270 fs/inode.c:1658 update_time fs/inode.c:1674 [inline] file_update_time+0x243/0x360 fs/inode.c:1890 __generic_file_write_iter+0x1b3/0x590 mm/filemap.c:3122 ext4_file_write_iter+0x281/0xdc0 fs/ext4/file.c:270 call_write_iter include/linux/fs.h:1778 [inline] new_sync_write fs/read_write.c:469 [inline] __vfs_write+0x44e/0x630 fs/read_write.c:482 vfs_write+0x192/0x4e0 fs/read_write.c:544 SYSC_write fs/read_write.c:590 [inline] SyS_write+0xf2/0x210 fs/read_write.c:582 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x7f1cbc1a31cd RSP: 002b:00007f1cb975e590 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f1cb0002920 RCX: 00007f1cbc1a31cd RDX: 00000000000003eb RSI: 00007f1cb0002920 RDI: 0000000000000006 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007f1cb0002680 R13: 00007f1cb975e5b0 R14: 0000559d85503360 R15: 00000000000003eb Code: 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 90 00 00 00 83 bd e8 02 00 00 04 <74> 7b e8 2e f6 a0 ff 48 8d bb 20 03 00 00 48 b8 00 00 00 00 00