[syzbot] [ext4?] kernel BUG in ext4_es_cache_extent (3)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: ec299e4dc21e Merge tag 'bitmap-for-6.17-rc5' of https://gi..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1092a312580000
kernel config: https://syzkaller.appspot.com/x/.config?x=385d836f07b5a70d
dashboard link: https://syzkaller.appspot.com/bug?extid=038b7bf43423e132b308
compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12d1fe34580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14f8de62580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-ec299e4d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/d15022189f21/vmlinux-ec299e4d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/d73fbb71b816/bzImage-ec299e4d.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/e1c7d8ef0b25/mount_0.gz
fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=17a49e62580000)

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+038b7b...@syzkaller.appspotmail.com

EXT4-fs (loop0): 1 truncate cleaned up
EXT4-fs (loop0): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none.
------------[ cut here ]------------
kernel BUG at fs/ext4/extents_status.c:1012!
Oops: invalid opcode: 0000 [#1] SMP KASAN NOPTI
CPU: 0 UID: 0 PID: 5527 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:ext4_es_cache_extent+0x698/0x700 fs/ext4/extents_status.c:1012
Code: ff df 80 3c 08 00 74 08 48 89 df e8 62 b0 b3 ff 48 8b 3b 48 8b 74 24 28 48 8d 54 24 60 e8 00 c3 0d 00 eb 14 e8 69 c0 4e ff 90 <0f> 0b e8 61 c0 4e ff eb 28 e8 5a c0 4e ff 31 f6 65 ff 0d 81 32 30
RSP: 0018:ffffc900028ff420 EFLAGS: 00010293
RAX: ffffffff8270fd97 RBX: 00000000ffffffff RCX: ffff8880330fc880
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 00000000000072ce
RBP: ffffc900028ff528 R08: ffffffff8fa3b637 R09: 1ffffffff1f476c6
R10: dffffc0000000000 R11: fffffbfff1f476c7 R12: 00000000000072d0
R13: 0000000000000008 R14: 00000000000072ce R15: dffffc0000000000
FS: 000055556eaf2500(0000) GS:ffff88808d20d000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32463fff CR3: 0000000056f56000 CR4: 0000000000352ef0
Call Trace:
<TASK>
ext4_cache_extents fs/ext4/extents.c:544 [inline]
ext4_find_extent+0x482/0xcc0 fs/ext4/extents.c:928
ext4_get_verity_descriptor_location fs/ext4/verity.c:292 [inline]
ext4_get_verity_descriptor+0x102/0x590 fs/ext4/verity.c:346
fsverity_get_descriptor+0x8d/0x4b0 fs/verity/open.c:323
ensure_verity_info fs/verity/open.c:363 [inline]
__fsverity_file_open+0xd7/0x1f0 fs/verity/open.c:384
fsverity_file_open include/linux/fsverity.h:300 [inline]
ext4_file_open+0x32d/0xa40 fs/ext4/file.c:909
do_dentry_open+0x953/0x13f0 fs/open.c:965
vfs_open+0x3b/0x340 fs/open.c:1095
do_open fs/namei.c:3887 [inline]
path_openat+0x2ee5/0x3830 fs/namei.c:4046
do_filp_open+0x1fa/0x410 fs/namei.c:4073
do_sys_openat2+0x121/0x1c0 fs/open.c:1435
do_sys_open fs/open.c:1450 [inline]
__do_sys_openat fs/open.c:1466 [inline]
__se_sys_openat fs/open.c:1461 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1461
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f5a5878ebe9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fffa6498b18 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f5a589c5fa0 RCX: 00007f5a5878ebe9
RDX: 0000000000000000 RSI: 0000200000000100 RDI: ffffffffffffff9c
RBP: 00007f5a58811e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5a589c5fa0 R14: 00007f5a589c5fa0 R15: 0000000000000004
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ext4_es_cache_extent+0x698/0x700 fs/ext4/extents_status.c:1012
Code: ff df 80 3c 08 00 74 08 48 89 df e8 62 b0 b3 ff 48 8b 3b 48 8b 74 24 28 48 8d 54 24 60 e8 00 c3 0d 00 eb 14 e8 69 c0 4e ff 90 <0f> 0b e8 61 c0 4e ff eb 28 e8 5a c0 4e ff 31 f6 65 ff 0d 81 32 30
RSP: 0018:ffffc900028ff420 EFLAGS: 00010293
RAX: ffffffff8270fd97 RBX: 00000000ffffffff RCX: ffff8880330fc880
RDX: 0000000000000000 RSI: 00000000ffffffff RDI: 00000000000072ce
RBP: ffffc900028ff528 R08: ffffffff8fa3b637 R09: 1ffffffff1f476c6
R10: dffffc0000000000 R11: fffffbfff1f476c7 R12: 00000000000072d0
R13: 0000000000000008 R14: 00000000000072ce R15: dffffc0000000000
FS: 000055556eaf2500(0000) GS:ffff88808d20d000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b32463fff CR3: 0000000056f56000 CR4: 0000000000352ef0


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