------------[ cut here ]------------
kernel BUG at fs/ext4/extents.c:2135!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 1054 Comm: syz.8.34 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:ext4_ext_insert_extent+0x44fa/0x4530 fs/ext4/extents.c:2135
Code: ff ff 89 d9 80 e1 07 fe c1 38 c1 0f 8c 01 e9 ff ff 48 89 df e8 e7 01 d5 ff e9 f4 e8 ff ff e8 5d 12 9b ff 0f 0b e8 56 12 9b ff <0f> 0b e8 4f 12 9b ff 0f 0b 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 43
RSP: 0018:ffffc90002046160 EFLAGS: 00010293
RAX: ffffffff81c8934a RBX: ffff888124733400 RCX: ffff88810cb74f00
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 0000000000000009
RBP: ffffc90002046310 R08: dffffc0000000000 R09: ffffed1024ccc816
R10: ffffed1024ccc816 R11: 1ffff11024ccc815 R12: 0000000000000009
R13: 1ffff110223c6018 R14: ffff88812473343c R15: 0000000000000009
FS:  00007fee44cbd6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc505bdf6d CR3: 000000010f7ff000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 ext4_ext_map_blocks+0x148f/0x5d40 fs/ext4/extents.c:4356
 ext4_map_blocks+0x978/0x1bc0 fs/ext4/inode.c:674
 _ext4_get_block+0x1bb/0x4b0 fs/ext4/inode.c:817
 ext4_get_block_unwritten+0x2a/0x40 fs/ext4/inode.c:848
 ext4_block_write_begin+0x567/0x1330 fs/ext4/inode.c:1101
 ext4_write_begin+0x651/0x15a0 fs/ext4/ext4_jbd2.h:-1
 ext4_da_write_begin+0x455/0xe80 fs/ext4/inode.c:3033
 generic_perform_write+0x2be/0x510 mm/filemap.c:3509
 ext4_buffered_write_iter+0x4b8/0x640 fs/ext4/file.c:271
 ext4_file_write_iter+0x536/0x1980 fs/ext4/file.c:-1
 __kernel_write+0x55a/0x910 fs/read_write.c:550
 dump_emit+0x240/0x360 fs/coredump.c:855
 dump_user_range+0x6a/0x1a0 fs/coredump.c:908
 elf_core_dump+0x278a/0x2bc0 fs/binfmt_elf.c:2290
 do_coredump+0x1ac9/0x27f0 fs/coredump.c:817
 get_signal+0xf23/0x12e0 kernel/signal.c:2779
 arch_do_signal_or_restart+0xbf/0x10f0 arch/x86/kernel/signal.c:805
 handle_signal_work kernel/entry/common.c:145 [inline]
 exit_to_user_mode_loop+0xa2/0xe0 kernel/entry/common.c:169
 exit_to_user_mode_prepare+0x76/0xa0 kernel/entry/common.c:199
 irqentry_exit_to_user_mode+0x9/0x10 kernel/entry/common.c:287
 irqentry_exit+0x12/0x60 kernel/entry/common.c:375
 exc_page_fault+0x67/0xc0 arch/x86/mm/fault.c:1487
 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:571
RIP: 0033:0x7fee44e4cec9
Code: Unable to access opcode bytes at RIP 0x7fee44e4ce9f.
RSP: 002b:00007fee44cbcfe8 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 00007fee450a3fa0 RCX: 00007fee44e4cec9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000a000
RBP: 00007fee44ecff91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007fee450a4038 R14: 00007fee450a3fa0 R15: 00007fffd2dff7e8
Modules linked in:
---[ end trace 76bc21133ff197de ]---
RIP: 0010:ext4_ext_insert_extent+0x44fa/0x4530 fs/ext4/extents.c:2135
Code: ff ff 89 d9 80 e1 07 fe c1 38 c1 0f 8c 01 e9 ff ff 48 89 df e8 e7 01 d5 ff e9 f4 e8 ff ff e8 5d 12 9b ff 0f 0b e8 56 12 9b ff <0f> 0b e8 4f 12 9b ff 0f 0b 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 43
RSP: 0018:ffffc90002046160 EFLAGS: 00010293

RAX: ffffffff81c8934a RBX: ffff888124733400 RCX: ffff88810cb74f00
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 0000000000000009
RBP: ffffc90002046310 R08: dffffc0000000000 R09: ffffed1024ccc816
R10: ffffed1024ccc816 R11: 1ffff11024ccc815 R12: 0000000000000009
R13: 1ffff110223c6018 R14: ffff88812473343c R15: 0000000000000009
FS:  00007fee44cbd6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fee44e4ce9f CR3: 000000010f7ff000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400