------------[ cut here ]------------
kernel BUG at fs/ext4/extents.c:2153!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 5848 Comm: syz.1.202 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026
RIP: 0010:ext4_ext_insert_extent+0x4a58/0x4a90 fs/ext4/extents.c:2153
Code: ff ff 89 d9 80 e1 07 fe c1 38 c1 0f 8c 76 e7 ff ff 48 89 df e8 c9 a3 c7 ff e9 69 e7 ff ff e8 9f 5a 6d ff 0f 0b e8 98 5a 6d ff <0f> 0b e8 91 5a 6d ff 0f 0b 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 5c
RSP: 0018:ffffc90001ab5ca0 EFLAGS: 00010293
RAX: ffffffff823361b8 RBX: 0000000000000011 RCX: ffff88811cca2280
RDX: 0000000000000000 RSI: 0000000000000011 RDI: 0000000000000011
RBP: ffffc90001ab5e70 R08: ffff888121dd41ff R09: 1ffff110243ba83f
R10: dffffc0000000000 R11: ffffed10243ba840 R12: 0000000000000011
R13: dffffc0000000000 R14: ffff888125ebc43c R15: ffff888104f96400
FS:  00007ff1bc13d6c0(0000) GS:ffff88826e4e1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe8bd5df6d CR3: 000000012246a000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 ext4_ext_map_blocks+0x197d/0x6820 fs/ext4/extents.c:4404
 ext4_map_create_blocks fs/ext4/inode.c:613 [inline]
 ext4_map_blocks+0x8eb/0x1830 fs/ext4/inode.c:816
 _ext4_get_block+0x1e6/0x480 fs/ext4/inode.c:916
 ext4_get_block_unwritten+0x32/0x100 fs/ext4/inode.c:949
 ext4_block_write_begin+0xa28/0x16f0 fs/ext4/inode.c:1203
 ext4_write_begin+0xa1e/0x15b0 fs/ext4/ext4_jbd2.h:-1
 ext4_da_write_begin+0x358/0xb40 fs/ext4/inode.c:3130
 generic_perform_write+0x2d3/0x7f0 mm/filemap.c:4314
 ext4_buffered_write_iter+0x34f/0x670 fs/ext4/file.c:299
 ext4_file_write_iter+0x5dd/0x18b0 fs/ext4/file.c:-1
 __kernel_write_iter+0x41e/0x880 fs/read_write.c:619
 dump_emit_page fs/coredump.c:1298 [inline]
 dump_user_range+0x5c7/0xaf0 fs/coredump.c:1372
 elf_core_dump+0x2d41/0x3290 fs/binfmt_elf.c:2111
 coredump_write+0xf7a/0x15c0 fs/coredump.c:1049
 do_coredump fs/coredump.c:1126 [inline]
 vfs_coredump+0x3340/0x3c10 fs/coredump.c:1200
 get_signal+0x1138/0x1410 kernel/signal.c:3019
 arch_do_signal_or_restart+0xbb/0x760 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:41 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:75 [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+0xc6/0x130 kernel/entry/common.c:196
 exc_page_fault+0x7c/0xb0 arch/x86/mm/fault.c:1530
 asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7ff1bb19aeb9
Code: Unable to access opcode bytes at 0x7ff1bb19ae8f.
RSP: 002b:00007ff1bc13cfd8 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 00007ff1bb415fa0 RCX: 00007ff1bb19aeb9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000a000
RBP: 00007ff1bb208c1f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ff1bb416038 R14: 00007ff1bb415fa0 R15: 00007ffe8bd5cb48
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_ext_insert_extent+0x4a58/0x4a90 fs/ext4/extents.c:2153
Code: ff ff 89 d9 80 e1 07 fe c1 38 c1 0f 8c 76 e7 ff ff 48 89 df e8 c9 a3 c7 ff e9 69 e7 ff ff e8 9f 5a 6d ff 0f 0b e8 98 5a 6d ff <0f> 0b e8 91 5a 6d ff 0f 0b 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 5c
RSP: 0018:ffffc90001ab5ca0 EFLAGS: 00010293
RAX: ffffffff823361b8 RBX: 0000000000000011 RCX: ffff88811cca2280
RDX: 0000000000000000 RSI: 0000000000000011 RDI: 0000000000000011
RBP: ffffc90001ab5e70 R08: ffff888121dd41ff R09: 1ffff110243ba83f
R10: dffffc0000000000 R11: ffffed10243ba840 R12: 0000000000000011
R13: dffffc0000000000 R14: ffff888125ebc43c R15: ffff888104f96400
FS:  00007ff1bc13d6c0(0000) GS:ffff88826e5e1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe8bd5df6d CR3: 000000012246a000 CR4: 00000000003526b0