loop0: detected capacity change from 0 to 512
EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
loop0: detected capacity change from 512 to 64
------------[ cut here ]------------
kernel BUG at fs/ext4/mballoc.c:4765!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5318 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:ext4_mb_use_inode_pa+0x6c1/0x720 fs/ext4/mballoc.c:4765
Code: e8 b4 ec a9 ff 48 ba 00 00 00 00 00 fc ff df e9 da fa ff ff e8 00 ae 42 ff 90 0f 0b e8 f8 ad 42 ff 90 0f 0b e8 f0 ad 42 ff 90 <0f> 0b e8 e8 ad 42 ff 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc9000d3de9e8 EFLAGS: 00010283
RAX: ffffffff827da580 RBX: 00000000fffffff4 RCX: 0000000000100000
RDX: ffffc9000e14a000 RSI: 000000000000369d RDI: 000000000000369e
RBP: 1ffff11008633c7b R08: ffff88804319f5eb R09: 1ffff11008633ebd
R10: dffffc0000000000 R11: ffffed1008633ebe R12: 0000000000000000
R13: 0000000000000010 R14: 1ffff11008633ec0 R15: ffff88804319f600
FS:  00007f6f9bfac6c0(0000) GS:ffff88808d2fb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9b3441a000 CR3: 00000000122c1000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ext4_mb_use_preallocated+0x660/0x13f0 fs/ext4/mballoc.c:4982
 ext4_mb_new_blocks+0x5b4/0x4720 fs/ext4/mballoc.c:6286
 ext4_alloc_branch fs/ext4/indirect.c:340 [inline]
 ext4_ind_map_blocks+0xe42/0x21c0 fs/ext4/indirect.c:635
 ext4_map_create_blocks fs/ext4/inode.c:611 [inline]
 ext4_map_blocks+0x7fe/0x1740 fs/ext4/inode.c:811
 mpage_map_one_extent fs/ext4/inode.c:2374 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2468 [inline]
 ext4_do_writepages+0x16a1/0x4610 fs/ext4/inode.c:2931
 ext4_writepages+0x205/0x350 fs/ext4/inode.c:3025
 do_writepages+0x32e/0x550 mm/page-writeback.c:2604
 __writeback_single_inode+0x145/0xff0 fs/fs-writeback.c:1719
 writeback_single_inode+0x1f9/0x6a0 fs/fs-writeback.c:1840
 write_inode_now+0x160/0x1d0 fs/fs-writeback.c:2903
 iput_final fs/inode.c:1901 [inline]
 iput+0x830/0xc50 fs/inode.c:1966
 __dentry_kill+0x209/0x660 fs/dcache.c:669
 dput+0x19f/0x2b0 fs/dcache.c:911
 __fput+0x68e/0xa70 fs/file_table.c:476
 task_work_run+0x1d4/0x260 kernel/task_work.c:227
 get_signal+0x11ec/0x1340 kernel/signal.c:2807
 arch_do_signal_or_restart+0xa0/0x790 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop+0x72/0x130 kernel/entry/common.c:40
 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline]
 do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6f9b18efc9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f6f9bfac038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: 0000000000007000 RBX: 00007f6f9b3e5fa0 RCX: 00007f6f9b18efc9
RDX: 000000000001040c RSI: 0000200000000380 RDI: 0000000000000004
RBP: 00007f6f9b211f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6f9b3e6038 R14: 00007f6f9b3e5fa0 R15: 00007ffdff805878
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_mb_use_inode_pa+0x6c1/0x720 fs/ext4/mballoc.c:4765
Code: e8 b4 ec a9 ff 48 ba 00 00 00 00 00 fc ff df e9 da fa ff ff e8 00 ae 42 ff 90 0f 0b e8 f8 ad 42 ff 90 0f 0b e8 f0 ad 42 ff 90 <0f> 0b e8 e8 ad 42 ff 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc9000d3de9e8 EFLAGS: 00010283
RAX: ffffffff827da580 RBX: 00000000fffffff4 RCX: 0000000000100000
RDX: ffffc9000e14a000 RSI: 000000000000369d RDI: 000000000000369e
RBP: 1ffff11008633c7b R08: ffff88804319f5eb R09: 1ffff11008633ebd
R10: dffffc0000000000 R11: ffffed1008633ebe R12: 0000000000000000
R13: 0000000000000010 R14: 1ffff11008633ec0 R15: ffff88804319f600
FS:  00007f6f9bfac6c0(0000) GS:ffff88808d2fb000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9b3441a000 CR3: 00000000122c1000 CR4: 0000000000352ef0