[syzbot] [ocfs2?] kernel BUG in ocfs2_read_virt_blocks

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    87d6aab2389e Merge tag 'for_linus' of git://git.kernel.org..
git tree:       upstream
console+strace: https://syzkaller.appspot.com/x/log.txt?x=17fbbb80580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=7a3fccdd0bb995
dashboard link: https://syzkaller.appspot.com/bug?extid=797d4829dafe3f11dce7
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13c117d0580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1007bb80580000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/47c26a185f6d/disk-87d6aab2.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/fe82dfdaaac4/vmlinux-87d6aab2.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ecaba119a5f0/bzImage-87d6aab2.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/197dcbc41fea/mount_0.gz

Bisection is inconclusive: the issue happens on the oldest tested release.

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=114db707980000
final oops:     https://syzkaller.appspot.com/x/report.txt?x=134db707980000
console output: https://syzkaller.appspot.com/x/log.txt?x=154db707980000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+797d4829dafe3f11dce7@xxxxxxxxxxxxxxxxxxxxxxxxx

JBD2: Ignoring recovery information on journal
ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.
------------[ cut here ]------------
kernel BUG at fs/ocfs2/extent_map.c:971!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 1 UID: 0 PID: 5221 Comm: syz-executor117 Not tainted 6.12.0-rc2-syzkaller-00006-g87d6aab2389e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:ocfs2_read_virt_blocks+0xaa3/0xb20 fs/ocfs2/extent_map.c:971
Code: 8b 54 24 30 8b 4c 24 1c 4c 8b 44 24 38 45 89 e1 ff 74 24 48 e8 7e 0a 0c 00 48 83 c4 08 eb 25 e8 43 d2 34 08 e8 ee d1 0c fe 90 <0f> 0b e8 e6 d1 0c fe 4c 89 e8 45 89 e5 49 89 c4 e9 01 f7 ff ff e8
RSP: 0018:ffffc90002e2e820 EFLAGS: 00010293
RAX: ffffffff83881432 RBX: 0000000000000000 RCX: ffff88802d3e9e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90002e2e9f0 R08: ffffffff83880eae R09: 1ffffffff203781d
R10: dffffc0000000000 R11: fffffbfff203781e R12: ffff8880764d8878
R13: 0000000000000000 R14: 0000000000000000 R15: 1ffff920005c5d18
FS:  000055557cd55380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005628fd41e058 CR3: 000000002d2e6000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ocfs2_read_dir_block+0x106/0x5c0 fs/ocfs2/dir.c:508
 ocfs2_find_dir_space_el fs/ocfs2/dir.c:3427 [inline]
 ocfs2_prepare_dir_for_insert+0x3f2/0x5c60 fs/ocfs2/dir.c:4274
 ocfs2_mknod+0xcaf/0x2b40 fs/ocfs2/namei.c:292
 ocfs2_create+0x1ab/0x480 fs/ocfs2/namei.c:672
 lookup_open fs/namei.c:3595 [inline]
 open_last_lookups fs/namei.c:3694 [inline]
 path_openat+0x1c03/0x3590 fs/namei.c:3930
 do_filp_open+0x235/0x490 fs/namei.c:3960
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1415
 do_sys_open fs/open.c:1430 [inline]
 __do_sys_openat fs/open.c:1446 [inline]
 __se_sys_openat fs/open.c:1441 [inline]
 __x64_sys_openat+0x247/0x2a0 fs/open.c:1441
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa356467d59
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 17 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe912bab08 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa356467d59
RDX: 000000000000275a RSI: 0000000020000040 RDI: 00000000ffffff9c
RBP: 00007fa3564e05f0 R08: 0000000000004472 R09: 000055557cd564c0
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffe912bab30
R13: 00007ffe912bad58 R14: 431bde82d7b634db R15: 00007fa3564b103b
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_read_virt_blocks+0xaa3/0xb20 fs/ocfs2/extent_map.c:971
Code: 8b 54 24 30 8b 4c 24 1c 4c 8b 44 24 38 45 89 e1 ff 74 24 48 e8 7e 0a 0c 00 48 83 c4 08 eb 25 e8 43 d2 34 08 e8 ee d1 0c fe 90 <0f> 0b e8 e6 d1 0c fe 4c 89 e8 45 89 e5 49 89 c4 e9 01 f7 ff ff e8
RSP: 0018:ffffc90002e2e820 EFLAGS: 00010293
RAX: ffffffff83881432 RBX: 0000000000000000 RCX: ffff88802d3e9e00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90002e2e9f0 R08: ffffffff83880eae R09: 1ffffffff203781d
R10: dffffc0000000000 R11: fffffbfff203781e R12: ffff8880764d8878
R13: 0000000000000000 R14: 0000000000000000 R15: 1ffff920005c5d18
FS:  000055557cd55380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005628fd41e058 CR3: 000000002d2e6000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
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