------------[ cut here ]------------
kernel BUG at fs/ext4/mballoc.c:4687!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 1031 Comm: kworker/u4:5 Not tainted 6.12.0-syzkaller-12113-gbcc8eda6d349 #0
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_use_inode_pa+0x690/0x700 fs/ext4/mballoc.c:4687
Code: 00 57 af 8e 4c 89 e6 48 89 ea e8 ab bc 9d 02 e9 be fc ff ff e8 81 5f 3a ff 90 0f 0b e8 79 5f 3a ff 90 0f 0b e8 71 5f 3a ff 90 <0f> 0b e8 69 5f 3a ff 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc900024a6508 EFLAGS: 00010293
RAX: ffffffff8265121f RBX: 00000000fffffff9 RCX: ffff888000e7a440
RDX: 0000000000000000 RSI: 000000000000000d RDI: 0000000000000006
RBP: 0000000000000000 R08: ffffffff82650f1f R09: 1ffff110086e4049
R10: dffffc0000000000 R11: ffffed10086e404a R12: ffff888043720260
R13: 1ffff1100a50fc8e R14: 000000000000000d R15: 1ffff110086e404c
FS:  0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020021000 CR3: 00000000387be000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ext4_mb_use_preallocated+0x680/0x1420 fs/ext4/mballoc.c:4904
 ext4_mb_new_blocks+0x6ef/0x4e00 fs/ext4/mballoc.c:6208
 ext4_alloc_branch fs/ext4/indirect.c:340 [inline]
 ext4_ind_map_blocks+0x108c/0x29e0 fs/ext4/indirect.c:635
 ext4_map_create_blocks fs/ext4/inode.c:518 [inline]
 ext4_map_blocks+0x85d/0x1990 fs/ext4/inode.c:702
 mpage_map_one_extent fs/ext4/inode.c:2219 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2272 [inline]
 ext4_do_writepages+0x15d8/0x3d10 fs/ext4/inode.c:2735
 ext4_writepages+0x213/0x3c0 fs/ext4/inode.c:2824
 do_writepages+0x35f/0x880 mm/page-writeback.c:2702
 __writeback_single_inode+0x14f/0x10d0 fs/fs-writeback.c:1680
 writeback_sb_inodes+0x820/0x1360 fs/fs-writeback.c:1976
 wb_writeback+0x413/0xb80 fs/fs-writeback.c:2156
 wb_do_writeback fs/fs-writeback.c:2303 [inline]
 wb_workfn+0x410/0x1080 fs/fs-writeback.c:2343
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_mb_use_inode_pa+0x690/0x700 fs/ext4/mballoc.c:4687
Code: 00 57 af 8e 4c 89 e6 48 89 ea e8 ab bc 9d 02 e9 be fc ff ff e8 81 5f 3a ff 90 0f 0b e8 79 5f 3a ff 90 0f 0b e8 71 5f 3a ff 90 <0f> 0b e8 69 5f 3a ff 90 0f 0b 48 8b 0c 24 80 e1 07 80 c1 03 38 c1
RSP: 0018:ffffc900024a6508 EFLAGS: 00010293
RAX: ffffffff8265121f RBX: 00000000fffffff9 RCX: ffff888000e7a440
RDX: 0000000000000000 RSI: 000000000000000d RDI: 0000000000000006
RBP: 0000000000000000 R08: ffffffff82650f1f R09: 1ffff110086e4049
R10: dffffc0000000000 R11: ffffed10086e404a R12: ffff888043720260
R13: 1ffff1100a50fc8e R14: 000000000000000d R15: 1ffff110086e404c
FS:  0000000000000000(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020021000 CR3: 00000000387be000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400