------------[ cut here ]------------ kernel BUG at fs/ext4/extents.c:2142! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 673 Comm: syz.6.30 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:ext4_ext_insert_extent+0x4790/0x47d0 fs/ext4/extents.c:2142 Code: ff 44 89 f1 80 e1 07 fe c1 38 c1 0f 8c c6 e8 ff ff 4c 89 f7 e8 d1 60 d2 ff e9 b9 e8 ff ff e8 a7 de 8e ff 0f 0b e8 a0 de 8e ff <0f> 0b e8 99 de 8e ff 0f 0b 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 40 RSP: 0018:ffffc90000f36540 EFLAGS: 00010293 RAX: ffffffff81e0df80 RBX: ffff888125f9c400 RCX: ffff88810e88e480 RDX: 0000000000000000 RSI: 000000000000001f RDI: 000000000000001f RBP: ffffc90000f366f0 R08: ffff88812ebc2e77 R09: 1ffff11025d785ce R10: dffffc0000000000 R11: ffffed1025d785cf R12: 000000000000001f R13: ffff88812eb355a8 R14: ffff888125f9c43c R15: 000000000000001f FS: 00007f8a421eb6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc30ad7a000 CR3: 0000000130ae8000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ext4_split_extent_at+0x7d4/0xf70 fs/ext4/extents.c:3236 ext4_split_extent+0x1ba/0x4c0 fs/ext4/extents.c:3355 ext4_split_convert_extents fs/ext4/extents.c:3715 [inline] ext4_ext_handle_unwritten_extents fs/ext4/extents.c:3876 [inline] ext4_ext_map_blocks+0x10e5/0x61d0 fs/ext4/extents.c:4231 ext4_map_blocks+0x9d8/0x1b70 fs/ext4/inode.c:679 mpage_map_one_extent fs/ext4/inode.c:2434 [inline] mpage_map_and_submit_extent fs/ext4/inode.c:2487 [inline] ext4_writepages+0x13a0/0x3030 fs/ext4/inode.c:2855 do_writepages+0x3a4/0x5f0 mm/page-writeback.c:2491 filemap_fdatawrite_wbc+0x128/0x190 mm/filemap.c:388 __filemap_fdatawrite_range mm/filemap.c:421 [inline] file_write_and_wait_range+0x159/0x230 mm/filemap.c:774 ext4_sync_file+0x1a9/0xa10 fs/ext4/fsync.c:151 vfs_fsync_range+0x1a1/0x1b0 fs/sync.c:188 generic_write_sync include/linux/fs.h:2962 [inline] ext4_buffered_write_iter+0x573/0x630 fs/ext4/file.c:292 ext4_file_write_iter+0x191/0x1500 fs/ext4/file.c:-1 do_iter_readv_writev fs/read_write.c:-1 [inline] do_iter_write+0x665/0xb40 fs/read_write.c:861 vfs_iter_write+0x7d/0xa0 fs/read_write.c:902 iter_file_splice_write+0x69c/0xcd0 fs/splice.c:685 do_splice_from fs/splice.c:763 [inline] direct_splice_actor+0xf7/0x130 fs/splice.c:950 splice_direct_to_actor+0x49e/0xbb0 fs/splice.c:896 do_splice_direct+0x1ce/0x2f0 fs/splice.c:1002 do_sendfile+0x5ed/0xea0 fs/read_write.c:1255 __do_sys_sendfile64 fs/read_write.c:1323 [inline] __se_sys_sendfile64 fs/read_write.c:1309 [inline] __x64_sys_sendfile64+0x199/0x1f0 fs/read_write.c:1309 x64_sys_call+0x62c/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:41 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f8a4139c799 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:00007f8a421eb028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00007f8a41615fa0 RCX: 00007f8a4139c799 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000005 RBP: 00007f8a41432bd9 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000003ffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007f8a41616038 R14: 00007f8a41615fa0 R15: 00007ffd770ef928 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ext4_ext_insert_extent+0x4790/0x47d0 fs/ext4/extents.c:2142 Code: ff 44 89 f1 80 e1 07 fe c1 38 c1 0f 8c c6 e8 ff ff 4c 89 f7 e8 d1 60 d2 ff e9 b9 e8 ff ff e8 a7 de 8e ff 0f 0b e8 a0 de 8e ff <0f> 0b e8 99 de 8e ff 0f 0b 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 40 RSP: 0018:ffffc90000f36540 EFLAGS: 00010293 RAX: ffffffff81e0df80 RBX: ffff888125f9c400 RCX: ffff88810e88e480 RDX: 0000000000000000 RSI: 000000000000001f RDI: 000000000000001f RBP: ffffc90000f366f0 R08: ffff88812ebc2e77 R09: 1ffff11025d785ce R10: dffffc0000000000 R11: ffffed1025d785cf R12: 000000000000001f R13: ffff88812eb355a8 R14: ffff888125f9c43c R15: 000000000000001f FS: 00007f8a421eb6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc30ad7a000 CR3: 0000000130ae8000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400