------------[ cut here ]------------
kernel BUG at fs/ext4/extents.c:2140!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 748 Comm: syz.6.68 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:ext4_ext_insert_extent+0x477e/0x47c0 fs/ext4/extents.c:2140
Code: ff 44 89 f1 80 e1 07 fe c1 38 c1 0f 8c a5 e8 ff ff 4c 89 f7 e8 73 78 d4 ff e9 98 e8 ff ff e8 b9 46 95 ff 0f 0b e8 b2 46 95 ff <0f> 0b e8 ab 46 95 ff 0f 0b 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 19
RSP: 0018:ffffc900019e6340 EFLAGS: 00010293
RAX: ffffffff81d4828e RBX: ffff888132d47400 RCX: ffff88811a8b13c0
RDX: 0000000000000000 RSI: 000000000000002e RDI: 000000000000002e
RBP: ffffc900019e64f0 R08: ffff88812ec513f7 R09: 1ffff11025d8a27e
R10: dffffc0000000000 R11: ffffed1025d8a27f R12: 000000000000002e
R13: ffff88812ef4a468 R14: ffff888132d47454 R15: 000000000000002e
FS:  00007f39db7eb6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3b1fb23000 CR3: 00000001188bc000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ext4_split_extent_at+0x76c/0xe50 fs/ext4/extents.c:3238
 ext4_split_extent+0x1ad/0x4a0 fs/ext4/extents.c:3360
 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
 do_iter_readv_writev+0x478/0x5f0 fs/read_write.c:-1
 do_iter_write+0x1fa/0x7b0 fs/read_write.c:855
 vfs_iter_write+0x7d/0xa0 fs/read_write.c:896
 iter_file_splice_write+0x68c/0xcb0 fs/splice.c:689
 do_splice_from fs/splice.c:767 [inline]
 direct_splice_actor+0xe9/0x120 fs/splice.c:936
 splice_direct_to_actor+0x4d8/0xb50 fs/splice.c:891
 do_splice_direct+0x1c2/0x2d0 fs/splice.c:979
 do_sendfile+0x5ed/0xea0 fs/read_write.c:1249
 __do_sys_sendfile64 fs/read_write.c:1317 [inline]
 __se_sys_sendfile64 fs/read_write.c:1303 [inline]
 __x64_sys_sendfile64+0x199/0x1f0 fs/read_write.c:1303
 x64_sys_call+0x88d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:41
 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: 0033:0x7f39db9a9799
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:00007f39db7eb028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f39dbc23090 RCX: 00007f39db9a9799
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000005
RBP: 00007f39dba3fbd9 R08: 0000000000000000 R09: 0000000000000000
R10: 000000007ffff000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f39dbc23128 R14: 00007f39dbc23090 R15: 00007ffd5f5c0bd8
 </TASK>
Modules linked in:
---[ end trace a678e18ee055596c ]---
RIP: 0010:ext4_ext_insert_extent+0x477e/0x47c0 fs/ext4/extents.c:2140
Code: ff 44 89 f1 80 e1 07 fe c1 38 c1 0f 8c a5 e8 ff ff 4c 89 f7 e8 73 78 d4 ff e9 98 e8 ff ff e8 b9 46 95 ff 0f 0b e8 b2 46 95 ff <0f> 0b e8 ab 46 95 ff 0f 0b 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 19
RSP: 0018:ffffc900019e6340 EFLAGS: 00010293
RAX: ffffffff81d4828e RBX: ffff888132d47400 RCX: ffff88811a8b13c0
RDX: 0000000000000000 RSI: 000000000000002e RDI: 000000000000002e
RBP: ffffc900019e64f0 R08: ffff88812ec513f7 R09: 1ffff11025d8a27e
R10: dffffc0000000000 R11: ffffed1025d8a27f R12: 000000000000002e
R13: ffff88812ef4a468 R14: ffff888132d47454 R15: 000000000000002e
FS:  00007f39db7eb6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000034000 CR3: 00000001188bc000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400