------------[ cut here ]------------
kernel BUG at fs/ext4/inode.c:2620!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5329 Comm: syz.0.0 Not tainted 6.12.0-syzkaller-09567-g7eef7e306d3c #0
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_do_writepages+0x3d0b/0x3d10 fs/ext4/inode.c:2619
Code: b0 8e 4c 89 f2 e8 e5 c9 a2 02 e9 ab fb ff ff e8 8b c1 3f ff 90 0f 0b e8 83 c1 3f ff 90 0f 0b e8 bb 00 7c 09 e8 76 c1 3f ff 90 <0f> 0b 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66
RSP: 0018:ffffc9000d2cf380 EFLAGS: 00010293
RAX: ffffffff82561baa RBX: 0000004000000000 RCX: ffff8880009a4880
RDX: 0000000000000000 RSI: 0000004000000000 RDI: 0000000000000000
RBP: ffffc9000d2cf790 R08: ffffffff8255e3ab R09: 1ffff110086f84fe
R10: dffffc0000000000 R11: ffffed10086f84ff R12: 0000000000000001
R13: 0000000000400040 R14: 0000004a10000000 R15: ffff8880437c2a50
FS:  0000555561265500(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002003b000 CR3: 000000003e3aa000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ext4_writepages+0x213/0x3c0 fs/ext4/inode.c:2824
 do_writepages+0x35f/0x880 mm/page-writeback.c:2702
 filemap_fdatawrite_wbc mm/filemap.c:397 [inline]
 __filemap_fdatawrite_range mm/filemap.c:430 [inline]
 __filemap_fdatawrite mm/filemap.c:436 [inline]
 filemap_flush+0x1d2/0x260 mm/filemap.c:463
 ext4_release_file+0x81/0x300 fs/ext4/file.c:169
 __fput+0x23c/0xa50 fs/file_table.c:450
 task_work_run+0x24f/0x310 kernel/task_work.c:239
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x13f/0x340 kernel/entry/common.c:218
 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f402e77e919
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:00007ffd3c80d418 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f402e937ba0 RCX: 00007f402e77e919
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f402e937ba0 R08: 0000000000000000 R09: 00007ffd3c80d70f
R10: 00007f402e937ac0 R11: 0000000000000246 R12: 000000000000e7b2
R13: 00007ffd3c80d520 R14: 0000000000000032 R15: ffffffffffffffff
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_do_writepages+0x3d0b/0x3d10 fs/ext4/inode.c:2619
Code: b0 8e 4c 89 f2 e8 e5 c9 a2 02 e9 ab fb ff ff e8 8b c1 3f ff 90 0f 0b e8 83 c1 3f ff 90 0f 0b e8 bb 00 7c 09 e8 76 c1 3f ff 90 <0f> 0b 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 66
RSP: 0018:ffffc9000d2cf380 EFLAGS: 00010293
RAX: ffffffff82561baa RBX: 0000004000000000 RCX: ffff8880009a4880
RDX: 0000000000000000 RSI: 0000004000000000 RDI: 0000000000000000
RBP: ffffc9000d2cf790 R08: ffffffff8255e3ab R09: 1ffff110086f84fe
R10: dffffc0000000000 R11: ffffed10086f84ff R12: 0000000000000001
R13: 0000000000400040 R14: 0000004a10000000 R15: ffff8880437c2a50
FS:  0000555561265500(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000002003b000 CR3: 000000003e3aa000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400