loop0: detected capacity change from 512 to 64
EXT4-fs error (device loop0): __ext4_find_entry:1626: inode #12: comm syz.0.0: checksumming directory block 0
EXT4-fs error (device loop0) in ext4_reserve_inode_write:6334: Out of memory
EXT4-fs error (device loop0): ext4_dirty_inode:6538: inode #15: comm syz.0.0: mark_inode_dirty error
------------[ cut here ]------------
kernel BUG at fs/ext4/mballoc.c:4755!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5356 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:4755
Code: e8 d4 c0 aa ff 48 ba 00 00 00 00 00 fc ff df e9 da fa ff ff e8 40 d1 45 ff 90 0f 0b e8 38 d1 45 ff 90 0f 0b e8 30 d1 45 ff 90 <0f> 0b e8 28 d1 45 ff 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc9000d51e8a8 EFLAGS: 00010293
RAX: ffffffff8279ed60 RBX: 00000000ffffffe8 RCX: ffff88803e4cc880
RDX: 0000000000000000 RSI: 000000000000002c RDI: 0000000000000014
RBP: 1ffff11006ce0898 R08: ffff888036705503 R09: 1ffff11006ce0aa0
R10: dffffc0000000000 R11: ffffed1006ce0aa1 R12: 0000000000000000
R13: 000000000000002c R14: 1ffff11006ce0aa3 R15: ffff888036705518
FS:  00007f503cfdd6c0(0000) GS:ffff88808d20a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe02ed69000 CR3: 0000000042eb9000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ext4_mb_use_preallocated+0x660/0x13f0 fs/ext4/mballoc.c:4972
 ext4_mb_new_blocks+0x5b4/0x4720 fs/ext4/mballoc.c:6276
 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:2634
 filemap_fdatawrite_wbc mm/filemap.c:386 [inline]
 __filemap_fdatawrite_range mm/filemap.c:419 [inline]
 file_write_and_wait_range+0x23e/0x340 mm/filemap.c:794
 generic_buffers_fsync_noflush+0x6c/0x180 fs/buffer.c:609
 ext4_fsync_nojournal fs/ext4/fsync.c:88 [inline]
 ext4_sync_file+0x332/0xb20 fs/ext4/fsync.c:147
 generic_write_sync include/linux/fs.h:3043 [inline]
 ext4_buffered_write_iter+0x2ca/0x3a0 fs/ext4/file.c:305
 ext4_file_write_iter+0x298/0x1bc0 fs/ext4/file.c:-1
 do_iter_readv_writev+0x619/0x8b0 fs/read_write.c:-1
 vfs_writev+0x31a/0x960 fs/read_write.c:1057
 do_pwritev fs/read_write.c:1153 [inline]
 __do_sys_pwritev2 fs/read_write.c:1211 [inline]
 __se_sys_pwritev2+0x179/0x290 fs/read_write.c:1202
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f503c18eba9
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:00007f503cfdd038 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 00007f503c3d6090 RCX: 00007f503c18eba9
RDX: 0000000000000001 RSI: 0000200000000100 RDI: 0000000000000009
RBP: 00007f503c211e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000005405 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f503c3d6128 R14: 00007f503c3d6090 R15: 00007ffdca7feea8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_mb_use_inode_pa+0x6c1/0x720 fs/ext4/mballoc.c:4755
Code: e8 d4 c0 aa ff 48 ba 00 00 00 00 00 fc ff df e9 da fa ff ff e8 40 d1 45 ff 90 0f 0b e8 38 d1 45 ff 90 0f 0b e8 30 d1 45 ff 90 <0f> 0b e8 28 d1 45 ff 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc9000d51e8a8 EFLAGS: 00010293
RAX: ffffffff8279ed60 RBX: 00000000ffffffe8 RCX: ffff88803e4cc880
RDX: 0000000000000000 RSI: 000000000000002c RDI: 0000000000000014
RBP: 1ffff11006ce0898 R08: ffff888036705503 R09: 1ffff11006ce0aa0
R10: dffffc0000000000 R11: ffffed1006ce0aa1 R12: 0000000000000000
R13: 000000000000002c R14: 1ffff11006ce0aa3 R15: ffff888036705518
FS:  00007f503cfdd6c0(0000) GS:ffff88808d20a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe02ed69000 CR3: 0000000042eb9000 CR4: 0000000000352ef0