------------[ cut here ]------------
kernel BUG at fs/ext4/extents.c:2135!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 3365 Comm: syz.8.123 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2025
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 03 d5 ff e9 f4 e8 ff ff e8 cd 16 9b ff 0f 0b e8 c6 16 9b ff <0f> 0b e8 bf 16 9b ff 0f 0b 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 43
RSP: 0018:ffffc90005b8e3e0 EFLAGS: 00010293
RAX: ffffffff81c88f4a RBX: ffff88812e35f400 RCX: ffff8881154813c0
RDX: 0000000000000000 RSI: 000000000000000c RDI: 000000000000000c
RBP: ffffc90005b8e590 R08: dffffc0000000000 R09: ffffed1024ba3294
R10: ffffed1024ba3294 R11: 1ffff11024ba3293 R12: 000000000000000c
R13: 1ffff11021f741a8 R14: ffff88812e35f430 R15: 000000000000000c
FS:  00007f55f22126c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc6722df6d CR3: 00000001111b3000 CR4: 00000000003506a0
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
 mpage_map_one_extent fs/ext4/inode.c:2452 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2505 [inline]
 ext4_writepages+0x11d5/0x2e00 fs/ext4/inode.c:2873
 do_writepages+0x12a/0x270 mm/page-writeback.c:2380
 __filemap_fdatawrite_range+0x2bc/0x360 mm/filemap.c:427
 file_write_and_wait_range+0x8c/0x110 mm/filemap.c:766
 ext4_sync_file+0x1a9/0x9f0 fs/ext4/fsync.c:151
 vfs_fsync_range+0x190/0x1a0 fs/sync.c:202
 generic_write_sync include/linux/fs.h:2920 [inline]
 ext4_buffered_write_iter+0x59b/0x640 fs/ext4/file.c:278
 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: 0033:0x7f55f23a1ec9
Code: Unable to access opcode bytes at RIP 0x7f55f23a1e9f.
RSP: 002b:00007f55f2211fe8 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 00007f55f25f8fa0 RCX: 00007f55f23a1ec9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000a000
RBP: 00007f55f2424f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f55f25f9038 R14: 00007f55f25f8fa0 R15: 00007ffc6722b768
Modules linked in:
---[ end trace 4c0558fe4b726319 ]---
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 03 d5 ff e9 f4 e8 ff ff e8 cd 16 9b ff 0f 0b e8 c6 16 9b ff <0f> 0b e8 bf 16 9b ff 0f 0b 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c 43
RSP: 0018:ffffc90005b8e3e0 EFLAGS: 00010293
RAX: ffffffff81c88f4a RBX: ffff88812e35f400 RCX: ffff8881154813c0
RDX: 0000000000000000 RSI: 000000000000000c RDI: 000000000000000c
RBP: ffffc90005b8e590 R08: dffffc0000000000 R09: ffffed1024ba3294
R10: ffffed1024ba3294 R11: 1ffff11024ba3293 R12: 000000000000000c
R13: 1ffff11021f741a8 R14: ffff88812e35f430 R15: 000000000000000c
FS:  00007f55f22126c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0b450f1000 CR3: 00000001111b3000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400