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.2:17252 blocked for more than 140 seconds. Not tainted 4.14.175-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D27416 17252 6364 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:857 [inline] xfs_log_quiesce+0x2ec/0x980 fs/xfs/xfs_log.c:983 xfs_log_unmount+0x1d/0xb0 fs/xfs/xfs_log.c:997 xfs_log_mount_cancel+0x40/0x50 fs/xfs/xfs_log.c:800 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: 0033:0x45f2da RSP: 002b:00007fba920a4a68 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fba920a56d4 RCX: 000000000045f2da RDX: 00007fba920a4ae0 RSI: 0000000020000140 RDI: 00007fba920a4b00 RBP: 000000000076bf00 R08: 00007fba920a4b40 R09: 00007fba920a4ae0 R10: 0000000000000000 R11: 0000000000000206 R12: 00000000ffffffff R13: 0000000000000bec R14: 00000000004ce13d R15: 000000000076bf0c Showing all locks held in the system: 1 lock held by khungtaskd/1058: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4544 1 lock held by syz-executor.2/17252: #0: (&type->s_umount_key#70/1){+.+.}, at: [] alloc_super fs/super.c:251 [inline] #0: (&type->s_umount_key#70/1){+.+.}, at: [] sget_userns+0x556/0xc30 fs/super.c:516 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1058 Comm: khungtaskd Not tainted 4.14.175-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 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3633 Comm: systemd-journal Not tainted 4.14.175-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880941a0580 task.stack: ffff8880941a8000 RIP: 0010:__sanitizer_cov_trace_pc+0x28/0x50 kernel/kcov.c:93 RSP: 0018:ffff8880941afa58 EFLAGS: 00000297 RAX: ffff8880941a0580 RBX: dffffc0000000000 RCX: 000000007fff0000 RDX: 0000000000000000 RSI: ffffc900018f4030 RDI: ffffffff86af2e68 RBP: ffff8880941afb78 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 000000007fff0000 R13: ffffc900018f41f8 R14: 0000000000000095 R15: ffff8880941afb78 FS: 00007f08de6af8c0(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f08dbd56000 CR3: 0000000094715000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ___bpf_prog_run+0xe6/0x55f0 kernel/bpf/core.c:1015 Code: ff ff 90 65 48 8b 04 25 40 ee 01 00 48 85 c0 74 1a 65 8b 15 1b a7 a7 7e 81 e2 00 01 1f 00 75 0b 8b 90 50 13 00 00 83 fa 01 74 01 48 8b 34 24 48 8b 88 58 13 00 00 8b 80 54 13 00 00 48 8b 11