EXT4-fs (loop0): Delayed block allocation failed for inode 15 at logical offset 0 with max blocks 1 with error 28
EXT4-fs (loop0): This should not happen!! Data will be lost
EXT4-fs (loop0): Total free blocks count 0
EXT4-fs (loop0): Free/Dirty block details
EXT4-fs (loop0): free_blocks=32
EXT4-fs (loop0): dirty_blocks=0
EXT4-fs (loop0): Block reservation details
EXT4-fs (loop0): i_reserved_data_blocks=0
EXT4-fs (loop0): start 0, size 131072, fe_logical 131072
------------[ cut here ]------------
kernel BUG at fs/ext4/mballoc.c:4657!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 1115 Comm: kworker/u4:10 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
Workqueue: writeback wb_workfn (flush-7:0)
RIP: 0010:ext4_mb_normalize_request+0x1cc9/0x1d00 fs/ext4/mballoc.c:4657
Code: 5b a9 ff 48 8b 44 24 38 48 8b 38 48 c7 c6 40 44 7f 8b 48 c7 c2 a0 5a 7f 8b 48 8b 4c 24 28 4d 89 f0 49 89 d9 e8 48 f5 09 00 90 <0f> 0b e8 30 b0 41 ff 90 0f 0b e8 28 b0 41 ff 90 0f 0b e8 20 b0 41
RSP: 0018:ffffc90003556520 EFLAGS: 00010246
RAX: 63f3948d54d4bb00 RBX: 0000000000020000 RCX: 63f3948d54d4bb00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffc90003556167 R09: 1ffff920006aac2c
R10: dffffc0000000000 R11: fffff520006aac2d R12: ffffffff00020800
R13: dffffc0000000000 R14: 0000000000020000 R15: 0000000000020000
FS:  0000000000000000(0000) GS:ffff88808d416000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f142bfe22b0 CR3: 000000004484e000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 ext4_mb_new_blocks+0xc46/0x46a0 fs/ext4/mballoc.c:6310
 ext4_ext_map_blocks+0x1877/0x69c0 fs/ext4/extents.c:4383
 ext4_map_create_blocks fs/ext4/inode.c:613 [inline]
 ext4_map_blocks+0x82c/0x16f0 fs/ext4/inode.c:816
 mpage_map_one_extent fs/ext4/inode.c:2380 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2474 [inline]
 ext4_do_writepages+0x222f/0x4500 fs/ext4/inode.c:2932
 ext4_writepages+0x203/0x350 fs/ext4/inode.c:3026
 do_writepages+0x32e/0x550 mm/page-writeback.c:2598
 __writeback_single_inode+0x133/0x1240 fs/fs-writeback.c:1737
 writeback_sb_inodes+0x93a/0x1870 fs/fs-writeback.c:2030
 __writeback_inodes_wb+0x111/0x240 fs/fs-writeback.c:2107
 wb_writeback+0x43f/0xaa0 fs/fs-writeback.c:2218
 wb_check_start_all fs/fs-writeback.c:2344 [inline]
 wb_do_writeback fs/fs-writeback.c:2370 [inline]
 wb_workfn+0x8ee/0xed0 fs/fs-writeback.c:2403
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_mb_normalize_request+0x1cc9/0x1d00 fs/ext4/mballoc.c:4657
Code: 5b a9 ff 48 8b 44 24 38 48 8b 38 48 c7 c6 40 44 7f 8b 48 c7 c2 a0 5a 7f 8b 48 8b 4c 24 28 4d 89 f0 49 89 d9 e8 48 f5 09 00 90 <0f> 0b e8 30 b0 41 ff 90 0f 0b e8 28 b0 41 ff 90 0f 0b e8 20 b0 41
RSP: 0018:ffffc90003556520 EFLAGS: 00010246
RAX: 63f3948d54d4bb00 RBX: 0000000000020000 RCX: 63f3948d54d4bb00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffc90003556167 R09: 1ffff920006aac2c
R10: dffffc0000000000 R11: fffff520006aac2d R12: ffffffff00020800
R13: dffffc0000000000 R14: 0000000000020000 R15: 0000000000020000
FS:  0000000000000000(0000) GS:ffff88808d416000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f142be4dad0 CR3: 0000000011107000 CR4: 0000000000352ef0