------------[ cut here ]------------
kernel BUG at fs/ext4/extents.c:2158!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 11124 Comm: syz.5.407 Not tainted syzkaller #0 PREEMPT 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:ext4_ext_insert_extent+0x4b15/0x4c00 fs/ext4/extents.c:2158
Code: 1b 48 85 db 75 58 e8 3a 62 6c ff 49 bd 00 00 00 00 00 fc ff df 4c 8b 3c 24 e9 99 b5 ff ff e8 22 62 6c ff 0f 0b e8 1b 62 6c ff <0f> 0b e8 14 62 6c ff 0f 0b 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 28
RSP: 0018:ffffc9000823dc40 EFLAGS: 00010293
RAX: ffffffff82365255 RBX: 0000000000000011 RCX: ffff88812d6f1140
RDX: 0000000000000000 RSI: 0000000000000011 RDI: 0000000000000011
RBP: ffffc9000823ddf0 R08: ffff888120fb3937 R09: 1ffff110241f6726
R10: dffffc0000000000 R11: ffffed10241f6727 R12: 0000000000000011
R13: dffffc0000000000 R14: ffff88812554f43c R15: ffff88810ae42600
FS:  00007f2fe71976c0(0000) GS:ffff88826e284000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fffa4534f6d CR3: 000000012bbb8000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 ext4_ext_map_blocks+0x14c7/0x54c0 fs/ext4/extents.c:4459
 ext4_map_create_blocks+0x12b/0x580 fs/ext4/inode.c:616
 ext4_map_blocks+0x7c3/0x11d0 fs/ext4/inode.c:809
 _ext4_get_block+0x1e2/0x470 fs/ext4/inode.c:909
 ext4_get_block_unwritten+0x2e/0x100 fs/ext4/inode.c:942
 ext4_block_write_begin+0xa32/0x16f0 fs/ext4/inode.c:1196
 ext4_write_begin+0xa15/0x15a0 fs/ext4/ext4_jbd2.h:-1
 ext4_da_write_begin+0x354/0xb40 fs/ext4/inode.c:3123
 generic_perform_write+0x2dd/0x800 mm/filemap.c:4314
 ext4_buffered_write_iter+0x34f/0x670 fs/ext4/file.c:300
 ext4_file_write_iter+0x63e/0x1920 fs/ext4/file.c:-1
 __kernel_write_iter+0x401/0x890 fs/read_write.c:621
 dump_emit_page fs/coredump.c:1299 [inline]
 dump_user_range+0x5c3/0xae0 fs/coredump.c:1373
 elf_core_dump+0x2eed/0x3500 fs/binfmt_elf.c:2111
 coredump_write+0xf8d/0x15e0 fs/coredump.c:1050
 do_coredump fs/coredump.c:1127 [inline]
 vfs_coredump+0x361a/0x41f0 fs/coredump.c:1201
 get_signal+0x112f/0x1410 kernel/signal.c:3019
 arch_do_signal_or_restart+0xb7/0x760 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:98 [inline]
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline]
 irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline]
 irqentry_exit+0xc2/0x130 kernel/entry/common.c:219
 exc_page_fault+0x78/0xb0 arch/x86/mm/fault.c:1530
 asm_exc_page_fault+0x27/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f2fe639bf79
Code: Unable to access opcode bytes at 0x7f2fe639bf4f.
RSP: 002b:00007f2fe7196fd8 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 00007f2fe6615fa0 RCX: 00007f2fe639bf79
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000a000
RBP: 00007f2fe64327e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f2fe6616038 R14: 00007f2fe6615fa0 R15: 00007fffa4532ae8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_ext_insert_extent+0x4b15/0x4c00 fs/ext4/extents.c:2158
Code: 1b 48 85 db 75 58 e8 3a 62 6c ff 49 bd 00 00 00 00 00 fc ff df 4c 8b 3c 24 e9 99 b5 ff ff e8 22 62 6c ff 0f 0b e8 1b 62 6c ff <0f> 0b e8 14 62 6c ff 0f 0b 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 28
RSP: 0018:ffffc9000823dc40 EFLAGS: 00010293
RAX: ffffffff82365255 RBX: 0000000000000011 RCX: ffff88812d6f1140
RDX: 0000000000000000 RSI: 0000000000000011 RDI: 0000000000000011
RBP: ffffc9000823ddf0 R08: ffff888120fb3937 R09: 1ffff110241f6726
R10: dffffc0000000000 R11: ffffed10241f6727 R12: 0000000000000011
R13: dffffc0000000000 R14: ffff88812554f43c R15: ffff88810ae42600
FS:  00007f2fe71976c0(0000) GS:ffff88826e284000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9637145000 CR3: 000000012bbb8000 CR4: 00000000003526b0