kernel BUG at fs/ext4/extents.c:1015! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 559 Comm: syz.2.17 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:ext4_ext_insert_index+0x54a/0x550 fs/ext4/extents.c:1015 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 a0 96 d4 ff e9 d0 fd ff ff e8 e6 d8 98 ff <0f> 0b 0f 1f 40 00 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 81 ec RSP: 0018:ffffc90000c76da0 EFLAGS: 00010293 RAX: ffffffff81ce1baa RBX: ffff8881241d9424 RCX: ffff8881163bd500 RDX: 0000000000000000 RSI: 00000000fffffffe RDI: 0000000000000000 RBP: ffffc90000c76e10 R08: dffffc0000000000 R09: ffffed1025a107ba R10: ffffed1025a107ba R11: 1ffff11025a107b9 R12: 0000000000000000 R13: 00000000000000cb R14: 00000000fffffffe R15: 0000000000000054 FS: 00007f08316366c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000002c000 CR3: 0000000110c98000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ext4_ext_split fs/ext4/extents.c:1275 [inline] ext4_ext_create_new_leaf fs/ext4/extents.c:1419 [inline] ext4_ext_insert_extent+0x3af6/0x47a0 fs/ext4/extents.c:2103 ext4_ext_map_blocks+0x18e1/0x6270 fs/ext4/extents.c:4362 ext4_map_blocks+0x97b/0x1b20 fs/ext4/inode.c:673 _ext4_get_block+0x1da/0x4e0 fs/ext4/inode.c:816 ext4_get_block_unwritten+0x2a/0x40 fs/ext4/inode.c:847 ext4_block_write_begin+0x556/0x1150 fs/ext4/inode.c:1101 ext4_write_begin+0x612/0xfe0 fs/ext4/ext4_jbd2.h:-1 ext4_da_write_begin+0x410/0x8f0 fs/ext4/inode.c:2975 generic_perform_write+0x2a7/0x510 mm/filemap.c:3785 ext4_buffered_write_iter+0x4ed/0x670 fs/ext4/file.c:268 ext4_file_write_iter+0x455/0x1560 include/linux/fs.h:-1 call_write_iter include/linux/fs.h:2172 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0x7b4/0xec0 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+0x191/0x220 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: 0033:0x7f08317c5fc9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f0831636038 EFLAGS: 00000246 ORIG_RAX: 0000000000000012 RAX: ffffffffffffffda RBX: 00007f0831a1cfa0 RCX: 00007f08317c5fc9 RDX: 00000000200000c1 RSI: 00002000000000c0 RDI: 0000000000000006 RBP: 00007f0831848f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000009000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f0831a1d038 R14: 00007f0831a1cfa0 R15: 00007ffeeaa22408 Modules linked in: ---[ end trace 305ef3446ecde39c ]--- RIP: 0010:ext4_ext_insert_index+0x54a/0x550 fs/ext4/extents.c:1015 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 a0 96 d4 ff e9 d0 fd ff ff e8 e6 d8 98 ff <0f> 0b 0f 1f 40 00 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 81 ec RSP: 0018:ffffc90000c76da0 EFLAGS: 00010293 RAX: ffffffff81ce1baa RBX: ffff8881241d9424 RCX: ffff8881163bd500 RDX: 0000000000000000 RSI: 00000000fffffffe RDI: 0000000000000000 RBP: ffffc90000c76e10 R08: dffffc0000000000 R09: ffffed1025a107ba R10: ffffed1025a107ba R11: 1ffff11025a107b9 R12: 0000000000000000 R13: 00000000000000cb R14: 00000000fffffffe R15: 0000000000000054 FS: 00007f08316366c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000002c000 CR3: 0000000110c98000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400