EXT4-fs error (device loop0): ext4_fill_super:4448: inode #2: comm syz-executor.0: iget: root inode unallocated EXT4-fs (loop0): get root inode failed EXT4-fs (loop0): mount failed INFO: task syz-executor.4:2358 blocked for more than 140 seconds. Not tainted 4.19.150-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D29472 2358 24729 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x8e5/0x22e0 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 request_wait_answer+0x3dc/0x750 fs/fuse/dev.c:485 __fuse_request_send+0x123/0x1d0 fs/fuse/dev.c:505 fuse_simple_request+0x2d2/0x6f0 fs/fuse/dev.c:576 fuse_do_getattr+0x230/0xc40 fs/fuse/dir.c:927 fuse_update_get_attr fs/fuse/dir.c:960 [inline] fuse_getattr+0x2c1/0x380 fs/fuse/dir.c:1838 vfs_getattr_nosec+0xff/0x160 fs/stat.c:79 vfs_getattr fs/stat.c:116 [inline] vfs_statx+0x15a/0x210 fs/stat.c:189 vfs_stat include/linux/fs.h:3133 [inline] __do_sys_newstat fs/stat.c:337 [inline] __se_sys_newstat+0x96/0x120 fs/stat.c:333 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45de59 Code: Bad RIP value. RSP: 002b:00007f4562427c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000004 RAX: ffffffffffffffda RBX: 0000000000035100 RCX: 000000000045de59 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200004c0 RBP: 000000000118bf58 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffe3621688f R14: 00007f45624289c0 R15: 000000000118bf2c Showing all locks held in the system: 4 locks held by kworker/u4:2/47: 1 lock held by khungtaskd/1096: EXT4-fs error (device loop0): ext4_fill_super:4448: inode #2: comm syz-executor.0: iget: root inode unallocated #0: 00000000af6ea828 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x291 kernel/locking/lockdep.c:4440 EXT4-fs (loop0): get root inode failed 1 lock held by systemd-udevd/3726: EXT4-fs (loop0): mount failed 1 lock held by in:imklog/6177: #0: 00000000e63b57ac (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xe3/0x100 fs/file.c:767 3 locks held by rs:main Q:Reg/6178: #0: 00000000270f28e4 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1823 [inline] #0: 00000000270f28e4 (&rq->lock){-.-.}, at: __schedule+0x257/0x22e0 kernel/sched/core.c:3455 #1: 0000000004892241 (&cfs_rq->removed.lock){-.-.}, at: update_cfs_rq_load_avg kernel/sched/fair.c:3490 [inline] #1: 0000000004892241 (&cfs_rq->removed.lock){-.-.}, at: update_load_avg kernel/sched/fair.c:3612 [inline] #1: 0000000004892241 (&cfs_rq->removed.lock){-.-.}, at: dequeue_entity+0x52d/0x28b0 kernel/sched/fair.c:4058 #2: 00000000af6ea828 (rcu_read_lock){....}, at: is_bpf_text_address+0x0/0x1f0 kernel/bpf/core.c:532 2 locks held by agetty/6405: #0: 00000000d45eee8b (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:272 #1: 00000000b74b75cc (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x217/0x18c0 drivers/tty/n_tty.c:2154 2 locks held by syz-executor.0/9400: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1096 Comm: khungtaskd Not tainted 4.19.150-syzkaller #0 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+0x22c/0x33e lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x18/0x3d lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1eb lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0xa62/0x1020 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3720 Comm: systemd-journal Not tainted 4.19.150-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__lock_acquire+0x1b9/0x3ff0 kernel/locking/lockdep.c:3321 Code: c0 0f 84 14 04 00 00 49 8d b8 38 01 00 00 be 04 00 00 00 4c 89 44 24 18 e8 c4 6b 53 00 4c 8b 44 24 18 f0 41 ff 80 38 01 00 00 <49> 8d 86 80 08 00 00 48 ba 00 00 00 00 00 fc ff df 48 89 c1 48 89 RSP: 0018:ffff8880943378d8 EFLAGS: 00000002 RAX: fffffbfff19c10ce RBX: 0000000000000000 RCX: ffffffff8157a06c RDX: fffffbfff19c10ce RSI: 0000000000000004 RDI: ffffffff8ce08668 RBP: 0000000000000002 R08: ffffffff8ce08530 R09: fffffbfff19c10cd R10: ffffffff8ce0866b R11: 0000000000000000 R12: 0000000000000001 R13: 0000000000000000 R14: ffff888094328240 R15: ffffffff894126c8 FS: 00007fc2b0a5d8c0(0000) GS:ffff8880ae200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc2ae0c4028 CR3: 00000000947c2000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: lock_acquire+0x170/0x3f0 kernel/locking/lockdep.c:3907 seqcount_lockdep_reader_access include/linux/seqlock.h:81 [inline] read_seqcount_begin include/linux/seqlock.h:164 [inline] read_seqbegin include/linux/seqlock.h:440 [inline] path_init+0x626/0x1ab0 fs/namei.c:2206 path_parentat+0x22/0x140 fs/namei.c:2366 filename_parentat+0x198/0x590 fs/namei.c:2389 filename_create+0x9e/0x490 fs/namei.c:3621 user_path_create fs/namei.c:3696 [inline] do_mkdirat+0xa0/0x2d0 fs/namei.c:3834 do_syscall_64+0xf9/0x670 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fc2afd19687 Code: 00 b8 ff ff ff ff c3 0f 1f 40 00 48 8b 05 09 d8 2b 00 64 c7 00 5f 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 d7 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffd087e0348 EFLAGS: 00000293 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007ffd087e3260 RCX: 00007fc2afd19687 RDX: 00007fc2b078aa00 RSI: 00000000000001ed RDI: 000055772a9658c0 RBP: 00007ffd087e0380 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ffd087e3260 R15: 00007ffd087e0870