00000040: 00 00 00 00 00 00 00 81 00 00 00 00 00 00 00 82 ................ 00000050: 00 00 00 01 00 00 10 00 00 00 00 01 00 00 00 00 ................ 00000060: 00 00 06 c0 b4 a4 02 00 01 00 00 10 00 00 00 00 ................ 00000070: 00 00 00 00 00 00 00 00 0c 09 08 04 0c 00 00 00 ................ XFS (loop2): SB validate failed with error -117. INFO: task syz-executor.5:2389 blocked for more than 140 seconds. Not tainted 5.0.0-rc6+ #73 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D26416 2389 7940 0x00000004 Call Trace: context_switch kernel/sched/core.c:2844 [inline] __schedule+0x817/0x1cc0 kernel/sched/core.c:3485 schedule+0x92/0x180 kernel/sched/core.c:3529 xlog_grant_head_wait+0x14e/0xd00 fs/xfs/xfs_log.c:263 xlog_grant_head_check+0x436/0x4a0 fs/xfs/xfs_log.c:325 xfs_log_reserve+0x371/0xae0 fs/xfs/xfs_log.c:454 xfs_log_write_unmount_record fs/xfs/xfs_log.c:854 [inline] xfs_log_unmount_write fs/xfs/xfs_log.c:953 [inline] xfs_log_quiesce+0x40d/0xcf0 fs/xfs/xfs_log.c:1020 xfs_log_unmount+0x22/0xb0 fs/xfs/xfs_log.c:1034 xfs_log_mount_cancel+0x47/0x60 fs/xfs/xfs_log.c:816 xfs_mountfs+0x1563/0x1fb0 fs/xfs/xfs_mount.c:1068 xfs_fs_fill_super+0xd0a/0x14f0 fs/xfs/xfs_super.c:1746 mount_bdev+0x307/0x3c0 fs/super.c:1159 xfs_fs_mount+0x35/0x40 fs/xfs/xfs_super.c:1820 mount_fs+0x106/0x3ff fs/super.c:1258 vfs_kern_mount.part.0+0x6f/0x410 fs/namespace.c:959 vfs_kern_mount fs/namespace.c:949 [inline] do_new_mount fs/namespace.c:2513 [inline] do_mount+0x581/0x2d30 fs/namespace.c:2847 ksys_mount+0xdb/0x150 fs/namespace.c:3063 __do_sys_mount fs/namespace.c:3077 [inline] __se_sys_mount fs/namespace.c:3074 [inline] __x64_sys_mount+0xbe/0x150 fs/namespace.c:3074 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a89a Code: de fa ff ff 0f 84 90 00 00 00 48 8d 84 24 70 03 00 00 48 29 f0 48 3d f8 82 00 00 76 7d 48 81 ec 08 80 00 00 48 89 ac 24 00 80 <00> 00 48 8d ac 24 00 80 00 00 48 8b 59 20 48 85 db 75 67 48 8b b4 RSP: 002b:00007f464c966a88 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f464c966b30 RCX: 000000000045a89a RDX: 00007f464c966ad0 RSI: 0000000020000100 RDI: 00007f464c966af0 RBP: 0000000020000100 R08: 00007f464c966b30 R09: 00007f464c966ad0 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000003 R13: 0000000000000000 R14: 00000000004dbcc8 R15: 00000000ffffffff Showing all locks held in the system: 3 locks held by kworker/u4:0/7: #0: 000000007f8e6769 (&rq->lock){-.-.}, at: idle_balance kernel/sched/fair.c:9934 [inline] #0: 000000007f8e6769 (&rq->lock){-.-.}, at: pick_next_task_fair+0x10f3/0x1860 kernel/sched/fair.c:7017 #1: 0000000052a26ba5 (rcu_read_lock){....}, at: __update_idle_core+0x45/0x3f0 kernel/sched/fair.c:6014 #2: 00000000cb793248 (&base->lock){-.-.}, at: __mod_timer kernel/time/timer.c:1033 [inline] #2: 00000000cb793248 (&base->lock){-.-.}, at: mod_timer kernel/time/timer.c:1101 [inline] #2: 00000000cb793248 (&base->lock){-.-.}, at: add_timer+0x2c6/0xbe0 kernel/time/timer.c:1137 1 lock held by khungtaskd/1040: #0: 0000000052a26ba5 (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:4389 1 lock held by rsyslogd/7797: #0: 00000000fe47bd34 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:795 2 locks held by getty/7887: #0: 0000000099383dbd (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000dc79ba5d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7888: #0: 00000000259eb23f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000956a350a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7889: #0: 0000000055d9e3ef (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 0000000081a7fa92 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7890: #0: 00000000fad4cfcf (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000c3dad14d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7891: #0: 00000000e2a955ed (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 00000000c9897e3a (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7892: #0: 00000000a5a2413e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000002b2428ad (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 2 locks held by getty/7893: #0: 00000000858d44b6 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341 #1: 000000006361863d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2154 1 lock held by syz-executor.5/2389: #0: 0000000025396e51 (&type->s_umount_key#80/1){+.+.}, at: alloc_super fs/super.c:227 [inline] #0: 0000000025396e51 (&type->s_umount_key#80/1){+.+.}, at: sget_userns+0x208/0xd30 fs/super.c:520 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1040 Comm: khungtaskd Not tainted 5.0.0-rc6+ #73 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+0x172/0x1f0 lib/dump_stack.c:113 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1be/0x236 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x9df/0xee0 kernel/hung_task.c:287 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x2/0x10 arch/x86/include/asm/irqflags.h:57