EXT4-fs error (device loop5): ext4_fill_super:4959: inode #2: comm syz-executor.5: iget: root inode unallocated
EXT4-fs (loop5): get root inode failed
EXT4-fs (loop5): mount failed
INFO: task syz-executor.6:11529 blocked for more than 143 seconds.
      Not tainted 5.10.96 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.6  state:D stack:24984 pid:11529 ppid:   290 flags:0x10004004
Call Trace:
 context_switch kernel/sched/core.c:3791 [inline]
 __schedule+0x848/0x1e80 kernel/sched/core.c:4540
 schedule+0xcb/0x270 kernel/sched/core.c:4618
 io_schedule+0xb6/0x130 kernel/sched/core.c:6291
 bit_wait_io+0x12/0xa0 kernel/sched/wait_bit.c:209
 __wait_on_bit_lock+0x131/0x1c0 kernel/sched/wait_bit.c:90
 out_of_line_wait_on_bit_lock+0xd5/0x110 kernel/sched/wait_bit.c:117
 wait_on_bit_lock_io include/linux/wait_bit.h:208 [inline]
 __lock_buffer fs/buffer.c:69 [inline]
 lock_buffer include/linux/buffer_head.h:366 [inline]
 __sync_dirty_buffer+0x360/0x3f0 fs/buffer.c:3142
 __ext4_handle_dirty_metadata+0x290/0x730 fs/ext4/ext4_jbd2.c:366
 ext4_convert_inline_data_nolock+0x671/0xdc0 fs/ext4/inline.c:1238
 ext4_convert_inline_data+0x31a/0x490 fs/ext4/inline.c:1987
 ext4_fallocate+0x1a4/0x3aa0 fs/ext4/extents.c:4696
 vfs_fallocate+0x48f/0xcb0 fs/open.c:309
 ioctl_preallocate+0x18e/0x200 fs/ioctl.c:494
 file_ioctl fs/ioctl.c:534 [inline]
 do_vfs_ioctl+0xe55/0x10d0 fs/ioctl.c:732
 __do_sys_ioctl fs/ioctl.c:751 [inline]
 __se_sys_ioctl fs/ioctl.c:739 [inline]
 __x64_sys_ioctl+0x108/0x210 fs/ioctl.c:739
 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f060421db19
RSP: 002b:00007f0601793188 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f0604330f60 RCX: 00007f060421db19
RDX: 0000000020000140 RSI: 0000000040305828 RDI: 0000000000000004
RBP: 00007f0604277f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc0151a3ff R14: 00007f0601793300 R15: 0000000000022000
INFO: task syz-executor.6:11598 blocked for more than 143 seconds.
      Not tainted 5.10.96 #1
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.6  state:D stack:26624 pid:11598 ppid:   290 flags:0x10004004
Call Trace:
 context_switch kernel/sched/core.c:3791 [inline]
 __schedule+0x848/0x1e80 kernel/sched/core.c:4540
 schedule+0xcb/0x270 kernel/sched/core.c:4618
 io_schedule+0xb6/0x130 kernel/sched/core.c:6291
 bit_wait_io+0x12/0xa0 kernel/sched/wait_bit.c:209
 __wait_on_bit_lock+0x131/0x1c0 kernel/sched/wait_bit.c:90
 out_of_line_wait_on_bit_lock+0xd5/0x110 kernel/sched/wait_bit.c:117
 wait_on_bit_lock_io include/linux/wait_bit.h:208 [inline]
 __lock_buffer fs/buffer.c:69 [inline]
 lock_buffer include/linux/buffer_head.h:366 [inline]
 write_dirty_buffer+0x165/0x180 fs/buffer.c:3121
 fsync_buffers_list fs/buffer.c:730 [inline]
 sync_mapping_buffers+0x3ed/0xd00 fs/buffer.c:548
 ext4_fsync_nojournal fs/ext4/fsync.c:86 [inline]
 ext4_sync_file+0x932/0xf30 fs/ext4/fsync.c:170
 vfs_fsync_range+0x13d/0x230 fs/sync.c:200
 generic_write_sync include/linux/fs.h:2741 [inline]
 ext4_buffered_write_iter+0x36a/0x4d0 fs/ext4/file.c:278
 ext4_file_write_iter+0x4ee/0x1890 fs/ext4/file.c:681
 call_write_iter include/linux/fs.h:1903 [inline]
 new_sync_write+0x42c/0x660 fs/read_write.c:518
 vfs_write+0x743/0xa20 fs/read_write.c:605
 ksys_write+0x12d/0x250 fs/read_write.c:658
 do_syscall_64+0x33/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f060421db19
RSP: 002b:00007f0601772188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f0604331020 RCX: 00007f060421db19
RDX: 0000000000000010 RSI: 0000000020000540 RDI: 0000000000000003
RBP: 00007f0604277f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc0151a3ff R14: 00007f0601772300 R15: 0000000000022000

Showing all locks held in the system:
1 lock held by khungtaskd/22:
 #0: ffffffff84df6a60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x269 kernel/locking/lockdep.c:6379
1 lock held by in:imklog/178:
2 locks held by rs:main Q:Reg/179:
2 locks held by syz-executor.6/11529:
 #0: ffff88804d9e4438 (sb_writers#3){.+.+}-{0:0}, at: ioctl_preallocate+0x18e/0x200 fs/ioctl.c:494
 #1: ffff88800b1e5960 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:142 [inline]
 #1: ffff88800b1e5960 (&ei->xattr_sem){++++}-{3:3}, at: ext4_convert_inline_data+0x21e/0x490 fs/ext4/inline.c:1985
2 locks held by syz-executor.6/11598:
 #0: ffff88800dff54f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:934
 #1: ffff88804d9e4438 (sb_writers#3){.+.+}-{0:0}, at: ksys_write+0x12d/0x250 fs/read_write.c:658

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