syzbot

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kernel BUG at fs/ext4/extents.c:2158!
Oops: invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 0 UID: 0 PID: 7490 Comm: syz.0.298 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:ext4_ext_insert_extent+0x4b19/0x4b50 fs/ext4/extents.c:2158
Code: 89 d9 80 e1 07 fe c1 38 c1 0f 8c 98 e7 ff ff 48 89 df e8 5a ea af ff e9 8b e7 ff ff e8 e0 bb 45 ff 90 0f 0b e8 d8 bb 45 ff 90 <0f> 0b e8 d0 bb 45 ff 90 0f 0b 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c
RSP: 0018:ffffc9000d1e6ac0 EFLAGS: 00010293
RAX: ffffffff827ff6b8 RBX: 000000000000003f RCX: ffff888031f69e40
RDX: 0000000000000000 RSI: 000000000000003f RDI: 000000000000003f
RBP: ffffc9000d1e6c70 R08: 0000000040000423 R09: 1ffffffff2023896
R10: dffffc0000000000 R11: fffffbfff2023897 R12: 000000000000003f
R13: dffffc0000000000 R14: ffff8880590db004 R15: ffff88803666ad00
FS:  00007f14be4cf6c0(0000) GS:ffff888125455000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f14bd5e9d40 CR3: 00000000759cc000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 ext4_ext_map_blocks+0x1696/0x58b0 fs/ext4/extents.c:4459
 ext4_map_create_blocks+0x11d/0x540 fs/ext4/inode.c:616
 ext4_map_blocks+0x7cd/0x11d0 fs/ext4/inode.c:809
 mpage_map_one_extent fs/ext4/inode.c:2373 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2467 [inline]
 ext4_do_writepages+0x22c0/0x46e0 fs/ext4/inode.c:2925
 ext4_writepages+0x241/0x3b0 fs/ext4/inode.c:3019
 do_writepages+0x32e/0x550 mm/page-writeback.c:2554
 filemap_writeback mm/filemap.c:387 [inline]
 filemap_fdatawrite_range mm/filemap.c:412 [inline]
 file_write_and_wait_range+0x36e/0x440 mm/filemap.c:786
 generic_buffers_fsync_noflush+0x70/0x1d0 fs/buffer.c:607
 ext4_fsync_nojournal fs/ext4/fsync.c:88 [inline]
 ext4_sync_file+0x321/0xb70 fs/ext4/fsync.c:147
 generic_write_sync include/linux/fs.h:2640 [inline]
 ext4_buffered_write_iter+0x2ca/0x3a0 fs/ext4/file.c:306
 ext4_file_write_iter+0x298/0x1bf0 fs/ext4/file.c:-1
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x61d/0xb90 fs/read_write.c:688
 ksys_pwrite64 fs/read_write.c:795 [inline]
 __do_sys_pwrite64 fs/read_write.c:803 [inline]
 __se_sys_pwrite64 fs/read_write.c:800 [inline]
 __x64_sys_pwrite64+0x199/0x230 fs/read_write.c:800
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f14bd59c629
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f14be4cf028 EFLAGS: 00000246 ORIG_RAX: 0000000000000012
RAX: ffffffffffffffda RBX: 00007f14bd816090 RCX: 00007f14bd59c629
RDX: 000000000000fdef RSI: 0000200000000140 RDI: 0000000000000005
RBP: 00007f14bd632b39 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000000fecc R11: 0000000000000246 R12: 0000000000000000
R13: 00007f14bd816128 R14: 00007f14bd816090 R15: 00007ffe9ff6f768
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_ext_insert_extent+0x4b19/0x4b50 fs/ext4/extents.c:2158
Code: 89 d9 80 e1 07 fe c1 38 c1 0f 8c 98 e7 ff ff 48 89 df e8 5a ea af ff e9 8b e7 ff ff e8 e0 bb 45 ff 90 0f 0b e8 d8 bb 45 ff 90 <0f> 0b e8 d0 bb 45 ff 90 0f 0b 89 d9 80 e1 07 80 c1 03 38 c1 0f 8c
RSP: 0018:ffffc9000d1e6ac0 EFLAGS: 00010293
RAX: ffffffff827ff6b8 RBX: 000000000000003f RCX: ffff888031f69e40
RDX: 0000000000000000 RSI: 000000000000003f RDI: 000000000000003f
RBP: ffffc9000d1e6c70 R08: 0000000040000423 R09: 1ffffffff2023896
R10: dffffc0000000000 R11: fffffbfff2023897 R12: 000000000000003f
R13: dffffc0000000000 R14: ffff8880590db004 R15: ffff88803666ad00
FS:  00007f14be4cf6c0(0000) GS:ffff888125555000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555586c6da28 CR3: 00000000759cc000 CR4: 00000000003526f0