[Android 6.1] kernel BUG in ext4_es_cache_extent

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 6bfa51973214 ANDROID: serial: qcom-geni: Add support for S..
git tree: android14-6.1
console output: https://syzkaller.appspot.com/x/log.txt?x=14574fe6580000
kernel config: https://syzkaller.appspot.com/x/.config?x=19de17fcb07fab22
dashboard link: https://syzkaller.appspot.com/bug?extid=69319f3f3c680030db3e
compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15794a02580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15a89552580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/f9b9d632f3cc/disk-6bfa5197.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/a2d8f05ae155/vmlinux-6bfa5197.xz
kernel image: https://storage.googleapis.com/syzbot-assets/84d5444f7348/bzImage-6bfa5197.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/90415f699eb5/mount_0.gz
fsck result: failed (log: https://syzkaller.appspot.com/x/fsck.log?x=15195b5a580000)

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+69319f...@syzkaller.appspotmail.com

------------[ cut here ]------------
kernel BUG at fs/ext4/extents_status.c:967!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 832 Comm: syz.1.112 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:ext4_es_cache_extent+0x57b/0x5d0 fs/ext4/extents_status.c:967
Code: e8 03 42 80 3c 38 00 74 08 48 89 df e8 de 27 cf ff 48 8b 3b 48 8b 74 24 28 48 8d 54 24 60 e8 3c fa 0c 00 eb 13 e8 45 f5 89 ff <0f> 0b e8 3e f5 89 ff eb 28 e8 37 f5 89 ff 31 f6 65 ff 0d f6 f5 1a
RSP: 0018:ffffc9000197e7a0 EFLAGS: 00010293
RAX: ffffffff81e777bb RBX: 000000000000009c RCX: ffff888119df2880
RDX: 0000000000000000 RSI: 000000000000009c RDI: 0000000000000097
RBP: ffffc9000197e8a8 R08: ffffc9000197e817 R09: ffffc9000197e800
R10: dffffc0000000000 R11: fffff5200032fd03 R12: ffff88810e1323c8
R13: 47ffffffffffffff R14: 0000000000000097 R15: dffffc0000000000
FS: 000055556c974500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555be5b888 CR3: 000000012d00a000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
ext4_cache_extents fs/ext4/extents.c:536 [inline]
__read_extent_tree_block+0x44b/0x790 fs/ext4/extents.c:583
ext4_find_extent+0x8b9/0xe20 fs/ext4/extents.c:936
ext4_ext_map_blocks+0x207/0x61d0 fs/ext4/extents.c:4166
ext4_map_blocks+0x9d8/0x1b70 fs/ext4/inode.c:679
_ext4_get_block+0x1ea/0x540 fs/ext4/inode.c:822
ext4_get_block_unwritten+0x2e/0x100 fs/ext4/inode.c:855
ext4_block_write_begin+0x594/0x1280 fs/ext4/inode.c:1124
ext4_write_begin+0x600/0xf90 fs/ext4/ext4_jbd2.h:-1
ext4_da_write_begin+0x3e7/0x8c0 fs/ext4/inode.c:3001
generic_perform_write+0x32d/0x740 mm/filemap.c:3903
ext4_buffered_write_iter+0x367/0x630 fs/ext4/file.c:285
ext4_file_write_iter+0x191/0x1500 fs/ext4/file.c:-1
do_iter_readv_writev fs/read_write.c:-1 [inline]
do_iter_write+0x665/0xb40 fs/read_write.c:861
vfs_iter_write+0x7d/0xa0 fs/read_write.c:902
iter_file_splice_write+0x69e/0xcd0 fs/splice.c:685
do_splice_from fs/splice.c:763 [inline]
direct_splice_actor+0xf7/0x130 fs/splice.c:930
splice_direct_to_actor+0x4ad/0xb30 fs/splice.c:885
do_splice_direct+0x1c2/0x2d0 fs/splice.c:973
do_sendfile+0x5ed/0xea0 fs/read_write.c:1255
__do_sys_sendfile64 fs/read_write.c:1323 [inline]
__se_sys_sendfile64 fs/read_write.c:1309 [inline]
__x64_sys_sendfile64+0x199/0x1f0 fs/read_write.c:1309
x64_sys_call+0x62c/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:41
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f3ac599c799
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:00007fffa3e85588 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f3ac5c15fa0 RCX: 00007f3ac599c799
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000005
RBP: 00007f3ac5a32bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000003ffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3ac5c15fac R14: 00007f3ac5c15fa0 R15: 00007f3ac5c15fa0
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_es_cache_extent+0x57b/0x5d0 fs/ext4/extents_status.c:967
Code: e8 03 42 80 3c 38 00 74 08 48 89 df e8 de 27 cf ff 48 8b 3b 48 8b 74 24 28 48 8d 54 24 60 e8 3c fa 0c 00 eb 13 e8 45 f5 89 ff <0f> 0b e8 3e f5 89 ff eb 28 e8 37 f5 89 ff 31 f6 65 ff 0d f6 f5 1a
RSP: 0018:ffffc9000197e7a0 EFLAGS: 00010293

RAX: ffffffff81e777bb RBX: 000000000000009c RCX: ffff888119df2880
RDX: 0000000000000000 RSI: 000000000000009c RDI: 0000000000000097
RBP: ffffc9000197e8a8 R08: ffffc9000197e817 R09: ffffc9000197e800
R10: dffffc0000000000 R11: fffff5200032fd03 R12: ffff88810e1323c8
R13: 47ffffffffffffff R14: 0000000000000097 R15: dffffc0000000000
FS: 000055556c974500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6fb79a9000 CR3: 000000012d00a000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

If the report is already addressed, let syzbot know by replying with:
#syz fix: exact-commit-title

If you want syzbot to run the reproducer, reply with:
#syz test: git://repo/address.git branch-or-commit-hash
If you attach or paste a git patch, syzbot will apply it before testing.

If you want to overwrite report's subsystems, reply with:
#syz set subsystems: new-subsystem
(See the list of subsystem names on the web dashboard)

If the report is a duplicate of another one, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup