------------[ cut here ]------------
kernel BUG at fs/ext4/extents.c:3189!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 364 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:ext4_split_extent_at+0xe29/0xe50 fs/ext4/extents.c:3189
Code: ff ff 44 89 f1 80 e1 07 fe c1 38 c1 0f 8c fc fb ff ff 4c 89 f7 49 89 d7 e8 64 e4 d2 ff 4c 89 fa e9 e9 fb ff ff e8 e7 b5 93 ff <0f> 0b e8 e0 b5 93 ff 0f 0b e8 d9 b5 93 ff 0f 0b e8 d2 b5 93 ff 0f
RSP: 0018:ffffc90000be6b40 EFLAGS: 00010287
RAX: ffffffff81d610f9 RBX: 0000000000008001 RCX: 0000000000080000
RDX: ffffc9000134b000 RSI: 00000000000193a2 RDI: 00000000000193a3
RBP: ffffc90000be6cc0 R08: 0000000000000017 R09: 000000004000003b
R10: dffffc0000000000 R11: ffffed1025a6e5ca R12: dffffc0000000000
R13: 000000000000011c R14: 0000000000000030 R15: 0000000000000017
FS:  00007f42fabad6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000003f000 CR3: 000000010f256000 CR4: 00000000003526b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ext4_split_extent+0x363/0x4a0 fs/ext4/extents.c:3391
 ext4_split_convert_extents fs/ext4/extents.c:3721 [inline]
 ext4_ext_handle_unwritten_extents fs/ext4/extents.c:3882 [inline]
 ext4_ext_map_blocks+0x10e5/0x61e0 fs/ext4/extents.c:4237
 ext4_map_blocks+0x988/0x1b30 fs/ext4/inode.c:674
 _ext4_get_block+0x1ea/0x540 fs/ext4/inode.c:817
 ext4_get_block_unwritten+0x2a/0x40 fs/ext4/inode.c:848
 ext4_block_write_begin+0x563/0x1160 fs/ext4/inode.c:1102
 ext4_write_begin+0x65a/0x12e0 fs/ext4/ext4_jbd2.h:-1
 ext4_da_write_begin+0x321/0xbf0 fs/ext4/inode.c:2988
 generic_perform_write+0x2b7/0x690 mm/filemap.c:3870
 ext4_buffered_write_iter+0x4ed/0x670 fs/ext4/file.c:270
 ext4_file_write_iter+0x440/0x1540 fs/ext4/file.c:-1
 call_write_iter include/linux/fs.h:2212 [inline]
 new_sync_write fs/read_write.c:507 [inline]
 vfs_write+0x835/0xfd0 fs/read_write.c:594
 ksys_pwrite64 fs/read_write.c:701 [inline]
 __do_sys_pwrite64 fs/read_write.c:711 [inline]
 __se_sys_pwrite64 fs/read_write.c:708 [inline]
 __x64_sys_pwrite64+0x197/0x220 fs/read_write.c:708
 x64_sys_call+0xa6/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:19
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f42fc152819
Code: ff c3 66 2e 0f 1f 84 00 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
RSP: 002b:00007f42fabad028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007f42fc3cbfa0 RCX: 00007f42fc152819
RDX: 00000000200000c1 RSI: 00002000000000c0 RDI: 0000000000000004
RBP: 00007f42fc1e8c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000009000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f42fc3cc038 R14: 00007f42fc3cbfa0 R15: 00007ffc23ff0678
 </TASK>
Modules linked in:
---[ end trace dadfdc313de79b8c ]---
RIP: 0010:ext4_split_extent_at+0xe29/0xe50 fs/ext4/extents.c:3189
Code: ff ff 44 89 f1 80 e1 07 fe c1 38 c1 0f 8c fc fb ff ff 4c 89 f7 49 89 d7 e8 64 e4 d2 ff 4c 89 fa e9 e9 fb ff ff e8 e7 b5 93 ff <0f> 0b e8 e0 b5 93 ff 0f 0b e8 d9 b5 93 ff 0f 0b e8 d2 b5 93 ff 0f
RSP: 0018:ffffc90000be6b40 EFLAGS: 00010287
RAX: ffffffff81d610f9 RBX: 0000000000008001 RCX: 0000000000080000
RDX: ffffc9000134b000 RSI: 00000000000193a2 RDI: 00000000000193a3
RBP: ffffc90000be6cc0 R08: 0000000000000017 R09: 000000004000003b
R10: dffffc0000000000 R11: ffffed1025a6e5ca R12: dffffc0000000000
R13: 000000000000011c R14: 0000000000000030 R15: 0000000000000017
FS:  00007f42fabad6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f55d3c4b2f8 CR3: 000000010f256000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400