EXT4-fs (loop0): feature flags set on rev 0 fs, running e2fsck is recommended EXT4-fs error (device loop0): ext4_get_journal_inode:4623: comm syz-executor035: inode #836960256: comm syz-executor035: iget: illegal inode # EXT4-fs (loop0): no journal found INFO: task syz-executor035:25651 blocked for more than 140 seconds. Not tainted 4.14.243-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor035 D27912 25651 7979 0x00000004 Call Trace: context_switch kernel/sched/core.c:2808 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3384 schedule+0x8d/0x1b0 kernel/sched/core.c:3428 schedule_timeout+0x80a/0xe90 kernel/time/timer.c:1724 do_wait_for_common kernel/sched/completion.c:91 [inline] __wait_for_common kernel/sched/completion.c:112 [inline] wait_for_common+0x272/0x430 kernel/sched/completion.c:123 kthread_stop+0xce/0x640 kernel/kthread.c:555 ext4_fill_super+0x6880/0xb290 fs/ext4/super.c:4561 mount_bdev+0x2b3/0x360 fs/super.c:1134 mount_fs+0x92/0x2a0 fs/super.c:1237 vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046 vfs_kern_mount fs/namespace.c:1036 [inline] do_new_mount fs/namespace.c:2549 [inline] do_mount+0xe53/0x2a00 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+0x46/0xbb RIP: 0033:0x450e8a RSP: 002b:00007ffe6d7e95c8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007ffe6d7e9620 RCX: 0000000000450e8a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007ffe6d7e95e0 RBP: 00007ffe6d7e95e0 R08: 00007ffe6d7e9620 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 00000000200003f8 R13: 0000000000000003 R14: 0000000000000004 R15: 0000000000000005 Showing all locks held in the system: 1 lock held by khungtaskd/1533: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 1 lock held by syz-executor035/25651: #0: (&type->s_umount_key#25/1){+.+.}, at: [] alloc_super fs/super.c:251 [inline] #0: (&type->s_umount_key#25/1){+.+.}, at: [] sget_userns+0x556/0xc10 fs/super.c:516 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1533 Comm: khungtaskd Not tainted 4.14.243-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+0x1b2/0x281 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x180 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+0x5b9/0xb40 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: 4623 Comm: systemd-journal Not tainted 4.14.243-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8880a1112100 task.stack: ffff8880a1118000 RIP: 0010:mark_held_locks+0x0/0xf0 kernel/locking/lockdep.c:2842 RSP: 0018:ffff8880a111fa40 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffff8880a1112100 RCX: 0000000000000000 RDX: 1ffff1101422252a RSI: 0000000000000000 RDI: ffff8880a1112100 RBP: ffffffff872335d9 R08: ffffffff8bfceb88 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88809ae8c340 R13: dffffc0000000000 R14: 1ffff11014223f52 R15: ffff8880a111fb10 FS: 00007ff68bdbd8c0(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff689442000 CR3: 00000000a1157000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __trace_hardirqs_on_caller kernel/locking/lockdep.c:2875 [inline] trace_hardirqs_on_caller+0x288/0x580 kernel/locking/lockdep.c:2930 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irqrestore+0x79/0xe0 kernel/locking/spinlock.c:192 debug_object_activate+0x1a0/0x490 lib/debugobjects.c:464 debug_rcu_head_queue kernel/rcu/rcu.h:152 [inline] __call_rcu.constprop.0+0x31/0x7d0 kernel/rcu/tree.c:3050 file_free fs/file_table.c:56 [inline] put_filp+0x75/0x90 fs/file_table.c:308 path_openat+0x6ce/0x2970 fs/namei.c:3581 do_filp_open+0x179/0x3c0 fs/namei.c:3603 do_sys_open+0x296/0x410 fs/open.c:1081 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7ff68b34c840 RSP: 002b:00007ffdab9b0958 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ffdab9b0c60 RCX: 00007ff68b34c840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 0000561d7665d600 RBP: 000000000000000d R08: 000000000000c0ff R09: 00000000ffffffff R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000561d76650040 R14: 00007ffdab9b0c20 R15: 0000561d7665d420 Code: 4c 89 f7 e8 f3 6f 3d 00 e9 c8 f4 ff ff 48 89 54 24 10 e8 c4 70 3d 00 48 8b 54 24 10 e9 27 f4 ff ff 66 2e 0f 1f 84 00 00 00 00 00 <48> b8 00 00 00 00 00 fc ff df 41 57 41 56 41 55 49 89 fd 48 81