------------[ cut here ]------------
kernel BUG at fs/ext4/extents.c:2135!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 1438 Comm: syz.8.235 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:ext4_ext_insert_extent+0x4592/0x45d0 fs/ext4/extents.c:2135
Code: ff ff 89 d9 80 e1 07 fe c1 38 c1 0f 8c 08 e9 ff ff 48 89 df e8 6f 51 d4 ff e9 fb e8 ff ff e8 95 d0 99 ff 0f 0b e8 8e d0 99 ff <0f> 0b e8 87 d0 99 ff 0f 0b 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 30
RSP: 0018:ffffc900017563e0 EFLAGS: 00010293
RAX: ffffffff81cae5c2 RBX: ffff888130941400 RCX: ffff8881071d62c0
RDX: 0000000000000000 RSI: 0000000000000063 RDI: 0000000000000063
RBP: ffffc90001756590 R08: ffff88810d382c7f R09: 1ffff11021a7058f
R10: dffffc0000000000 R11: ffffed1021a70590 R12: 0000000000000063
R13: 1ffff110237a0288 R14: ffff8881309414c0 R15: 0000000000000063
FS:  00007f475ec1c6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00002000000230bf CR3: 000000011912f000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ext4_ext_map_blocks+0x17a9/0x5dd0 fs/ext4/extents.c:4356
 ext4_map_blocks+0x985/0x1bd0 fs/ext4/inode.c:674
 mpage_map_one_extent fs/ext4/inode.c:2452 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2505 [inline]
 ext4_writepages+0x136a/0x2eb0 fs/ext4/inode.c:2873
 do_writepages+0x128/0x280 mm/page-writeback.c:2380
 __filemap_fdatawrite_range+0x2a0/0x350 mm/filemap.c:427
 file_write_and_wait_range+0x8c/0x110 mm/filemap.c:766
 ext4_sync_file+0x1a9/0x9f0 fs/ext4/fsync.c:151
 vfs_fsync_range+0x190/0x1a0 fs/sync.c:202
 generic_write_sync include/linux/fs.h:2920 [inline]
 ext4_buffered_write_iter+0x59b/0x640 fs/ext4/file.c:278
 ext4_file_write_iter+0x53f/0x1980 fs/ext4/file.c:-1
 __kernel_write+0x535/0x910 fs/read_write.c:550
 dump_emit+0x246/0x370 fs/coredump.c:855
 dump_user_range+0x6a/0x1a0 fs/coredump.c:908
 elf_core_dump+0x2866/0x2cc0 fs/binfmt_elf.c:2290
 do_coredump+0x1ba3/0x28e0 fs/coredump.c:817
 get_signal+0xf23/0x12e0 kernel/signal.c:2779
 arch_do_signal_or_restart+0xe2/0x11d0 arch/x86/kernel/signal.c:805
 handle_signal_work kernel/entry/common.c:145 [inline]
 exit_to_user_mode_loop+0xa2/0xe0 kernel/entry/common.c:169
 exit_to_user_mode_prepare+0x76/0xa0 kernel/entry/common.c:199
 irqentry_exit_to_user_mode+0x9/0x10 kernel/entry/common.c:287
 irqentry_exit+0x12/0x60 kernel/entry/common.c:375
 exc_page_fault+0x67/0xc0 arch/x86/mm/fault.c:1487
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:571
RIP: 0033:0x7f475edb9631
Code: 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:fffffffffffffd20 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f475f032fa0 RCX: 00007f475edb9629
RDX: 0000000000000000 RSI: fffffffffffffd20 RDI: 0000000001000000
RBP: 00007f475ee4fb39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f475f033038 R14: 00007f475f032fa0 R15: 00007ffcaa64f1e8
Modules linked in:
---[ end trace 0b6568486b27ac46 ]---
RIP: 0010:ext4_ext_insert_extent+0x4592/0x45d0 fs/ext4/extents.c:2135
Code: ff ff 89 d9 80 e1 07 fe c1 38 c1 0f 8c 08 e9 ff ff 48 89 df e8 6f 51 d4 ff e9 fb e8 ff ff e8 95 d0 99 ff 0f 0b e8 8e d0 99 ff <0f> 0b e8 87 d0 99 ff 0f 0b 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 30
RSP: 0018:ffffc900017563e0 EFLAGS: 00010293
RAX: ffffffff81cae5c2 RBX: ffff888130941400 RCX: ffff8881071d62c0
RDX: 0000000000000000 RSI: 0000000000000063 RDI: 0000000000000063
RBP: ffffc90001756590 R08: ffff88810d382c7f R09: 1ffff11021a7058f
R10: dffffc0000000000 R11: ffffed1021a70590 R12: 0000000000000063
R13: 1ffff110237a0288 R14: ffff8881309414c0 R15: 0000000000000063
FS:  00007f475ec1c6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f88cf01edac CR3: 000000011912f000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400