kernel BUG at fs/ext4/extents.c:1014!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 469 Comm: syz.2.16 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:ext4_ext_insert_index+0x52d/0x530 fs/ext4/extents.c:1014
Code: 4c 89 fa e9 ca fd ff ff 44 89 f1 80 e1 07 fe c1 38 c1 0f 8c dd fd ff ff 4c 89 f7 e8 fd e5 d2 ff e9 d0 fd ff ff e8 93 68 98 ff <0f> 0b 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 81 ec c0 00 00
RSP: 0018:ffffc90000f16b20 EFLAGS: 00010293
RAX: ffffffff81cc4d3d RBX: ffff88812a86e424 RCX: ffff888115e60000
RDX: 0000000000000000 RSI: 00000000fffffffe RDI: 0000000000000000
RBP: ffffc90000f16b90 R08: ffff88812a447c7f R09: 1ffff11025488f8f
R10: dffffc0000000000 R11: ffffed1025488f90 R12: 0000000000000000
R13: 00000000000000cb R14: 00000000fffffffe R15: 0000000000000054
FS:  00007f9cc25b96c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000002c0bf CR3: 00000001292f0000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ext4_ext_split fs/ext4/extents.c:1272 [inline]
 ext4_ext_create_new_leaf fs/ext4/extents.c:1414 [inline]
 ext4_ext_insert_extent+0x3948/0x45d0 fs/ext4/extents.c:2098
 ext4_ext_map_blocks+0x17a9/0x5dd0 fs/ext4/extents.c:4356
 ext4_map_blocks+0x985/0x1bd0 fs/ext4/inode.c:674
 _ext4_get_block+0x1d1/0x4e0 fs/ext4/inode.c:817
 ext4_get_block_unwritten+0x2a/0x40 fs/ext4/inode.c:848
 ext4_block_write_begin+0x573/0x1340 fs/ext4/inode.c:1101
 ext4_write_begin+0x67e/0x1690 fs/ext4/ext4_jbd2.h:-1
 ext4_da_write_begin+0x478/0xf10 fs/ext4/inode.c:3033
 generic_perform_write+0x2ce/0x540 mm/filemap.c:3509
 ext4_buffered_write_iter+0x4b8/0x640 fs/ext4/file.c:271
 ext4_file_write_iter+0x53f/0x1980 fs/ext4/file.c:-1
 call_write_iter include/linux/fs.h:2066 [inline]
 new_sync_write fs/read_write.c:518 [inline]
 vfs_write+0x758/0xdc0 fs/read_write.c:605
 ksys_pwrite64 fs/read_write.c:712 [inline]
 __do_sys_pwrite64 fs/read_write.c:722 [inline]
 __se_sys_pwrite64 fs/read_write.c:719 [inline]
 __x64_sys_pwrite64+0x197/0x220 fs/read_write.c:719
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f9cc2b53079
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:00007f9cc25b9028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007f9cc2d7ffa0 RCX: 00007f9cc2b53079
RDX: 00000000200000c1 RSI: 00002000000000c0 RDI: 0000000000000006
RBP: 00007f9cc2be5a4c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000009000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f9cc2d7ffa0 R15: 00007ffc98c18278
Modules linked in:
---[ end trace 1db015305979e750 ]---
RIP: 0010:ext4_ext_insert_index+0x52d/0x530 fs/ext4/extents.c:1014
Code: 4c 89 fa e9 ca fd ff ff 44 89 f1 80 e1 07 fe c1 38 c1 0f 8c dd fd ff ff 4c 89 f7 e8 fd e5 d2 ff e9 d0 fd ff ff e8 93 68 98 ff <0f> 0b 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 81 ec c0 00 00
RSP: 0018:ffffc90000f16b20 EFLAGS: 00010293
RAX: ffffffff81cc4d3d RBX: ffff88812a86e424 RCX: ffff888115e60000
RDX: 0000000000000000 RSI: 00000000fffffffe RDI: 0000000000000000
RBP: ffffc90000f16b90 R08: ffff88812a447c7f R09: 1ffff11025488f8f
R10: dffffc0000000000 R11: ffffed1025488f90 R12: 0000000000000000
R13: 00000000000000cb R14: 00000000fffffffe R15: 0000000000000054
FS:  00007f9cc25b96c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000002c0bf CR3: 00000001292f0000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400