------------[ cut here ]------------
kernel BUG at fs/ext4/inode.c:2420!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 1549 Comm: kworker/u4:4 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: writeback wb_workfn (flush-7:0)
RIP: 0010:mpage_map_one_extent fs/ext4/inode.c:2420 [inline]
RIP: 0010:mpage_map_and_submit_extent fs/ext4/inode.c:2461 [inline]
RIP: 0010:ext4_writepages+0x2d0b/0x2d20 fs/ext4/inode.c:2829
Code: 44 89 e1 80 e1 07 80 c1 03 38 c1 0f 8c b0 fd ff ff 4c 89 e7 e8 96 cf b2 ff e9 a3 fd ff ff e8 8c 67 6e ff 0f 0b e8 85 67 6e ff <0f> 0b e8 7e 67 6e ff 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 66 90 41
RSP: 0018:ffffc90005e47080 EFLAGS: 00010293
RAX: ffffffff8209639b RBX: 0000000000000000 RCX: ffff888023591dc0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90005e473d0 R08: dffffc0000000000 R09: ffffed100b62b3ff
R10: ffffed100b62b3ff R11: 1ffff1100b62b3fe R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88805b15a088
FS:  0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe05367b38 CR3: 000000002a4c4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 do_writepages+0x48d/0x6d0 mm/page-writeback.c:2386
 __writeback_single_inode+0x153/0xda0 fs/fs-writeback.c:1647
 writeback_sb_inodes+0x9fe/0x1610 fs/fs-writeback.c:1930
 wb_writeback+0x443/0xb90 fs/fs-writeback.c:2104
 wb_do_writeback fs/fs-writeback.c:2247 [inline]
 wb_workfn+0x423/0xe60 fs/fs-writeback.c:2288
 process_one_work+0x863/0x1000 kernel/workqueue.c:2310
 worker_thread+0xaa8/0x12a0 kernel/workqueue.c:2457
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
Modules linked in:
---[ end trace 7df39163ff7fcf9a ]---
RIP: 0010:mpage_map_one_extent fs/ext4/inode.c:2420 [inline]
RIP: 0010:mpage_map_and_submit_extent fs/ext4/inode.c:2461 [inline]
RIP: 0010:ext4_writepages+0x2d0b/0x2d20 fs/ext4/inode.c:2829
Code: 44 89 e1 80 e1 07 80 c1 03 38 c1 0f 8c b0 fd ff ff 4c 89 e7 e8 96 cf b2 ff e9 a3 fd ff ff e8 8c 67 6e ff 0f 0b e8 85 67 6e ff <0f> 0b e8 7e 67 6e ff 0f 0b 66 2e 0f 1f 84 00 00 00 00 00 66 90 41
RSP: 0018:ffffc90005e47080 EFLAGS: 00010293
RAX: ffffffff8209639b RBX: 0000000000000000 RCX: ffff888023591dc0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90005e473d0 R08: dffffc0000000000 R09: ffffed100b62b3ff
R10: ffffed100b62b3ff R11: 1ffff1100b62b3fe R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffff88805b15a088
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffeca89be68 CR3: 000000007d302000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400