------------[ cut here ]------------
kernel BUG at fs/ext4/extents.c:2140!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 3046 Comm: syz.5.967 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
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 f9 49 95 ff 0f 0b e8 f2 49 95 ff <0f> 0b e8 eb 49 95 ff 0f 0b 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 19
RSP: 0018:ffffc9000138eb80 EFLAGS: 00010287
RAX: ffffffff81d47cee RBX: ffff888123043400 RCX: 0000000000080000
RDX: ffffc9000a561000 RSI: 000000000000155f RDI: 0000000000001560
RBP: ffffc9000138ed30 R08: ffff88813336749f R09: 1ffff1102666ce93
R10: dffffc0000000000 R11: ffffed102666ce94 R12: 0000000000000004
R13: ffff888129664778 R14: ffff888123043424 R15: 0000000000000004
FS:  00007faad86be6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e623ffc CR3: 00000001230c1000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ext4_ext_map_blocks+0x186c/0x61e0 fs/ext4/extents.c:4368
 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_write+0x149/0x250 fs/read_write.c:647
 __do_sys_write fs/read_write.c:659 [inline]
 __se_sys_write fs/read_write.c:656 [inline]
 __x64_sys_write+0x7b/0x90 fs/read_write.c:656
 x64_sys_call+0x8ef/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:2
 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: 0033:0x7faad9c84819
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:00007faad86be028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007faad9efe090 RCX: 00007faad9c84819
RDX: 000000000208e24b RSI: 0000200000000000 RDI: 0000000000000004
RBP: 00007faad9d1ac91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007faad9efe128 R14: 00007faad9efe090 R15: 00007ffd7dc1a088
 </TASK>
Modules linked in:
---[ end trace a63444159dec04f2 ]---
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 f9 49 95 ff 0f 0b e8 f2 49 95 ff <0f> 0b e8 eb 49 95 ff 0f 0b 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 19
RSP: 0018:ffffc9000138eb80 EFLAGS: 00010287
RAX: ffffffff81d47cee RBX: ffff888123043400 RCX: 0000000000080000
RDX: ffffc9000a561000 RSI: 000000000000155f RDI: 0000000000001560
RBP: ffffc9000138ed30 R08: ffff88813336749f R09: 1ffff1102666ce93
R10: dffffc0000000000 R11: ffffed102666ce94 R12: 0000000000000004
R13: ffff888129664778 R14: ffff888123043424 R15: 0000000000000004
FS:  00007faad86be6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4027a4e2f8 CR3: 00000001230c1000 CR4: 00000000003506a0