[syzbot] [ocfs2?] general protection fault in ocfs2_prepare_dir_for_insert (2)

From: syzbot
Date: Mon Jun 09 2025 - 11:58:22 EST

Hello,

syzbot found the following issue on:

HEAD commit: ec7714e49479 Merge tag 'rust-6.16' of git://git.kernel.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=15bc2c0c580000
kernel config: https://syzkaller.appspot.com/x/.config?x=73696606574e3967
dashboard link: https://syzkaller.appspot.com/bug?extid=ded9116588a7b73c34bc
compiler: Debian clang version 20.1.6 (++20250514063057+1e4d39e07757-1~exp1~20250514183223.118), Debian LLD 20.1.6
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13bc2c0c580000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11a50c0c580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-ec7714e4.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/13d41a3ddb72/vmlinux-ec7714e4.xz
kernel image: https://storage.googleapis.com/syzbot-assets/ae9a3fb85228/bzImage-ec7714e4.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/31be3ccfd03b/mount_0.gz
fsck result: OK (log: https://syzkaller.appspot.com/x/fsck.log?x=1463e570580000)

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+ded9116588a7b73c34bc@xxxxxxxxxxxxxxxxxxxxxxxxx

ocfs2: Mounting device (7,0) on (node local, slot 0) with writeback data mode.
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 0 UID: 0 PID: 5317 Comm: syz-executor310 Not tainted 6.15.0-syzkaller-12141-gec7714e49479 #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:ocfs2_find_dir_space_id fs/ocfs2/dir.c:3424 [inline]
RIP: 0010:ocfs2_prepare_dir_for_insert+0x2f41/0x5450 fs/ocfs2/dir.c:4288
Code: ca 8b e8 52 8f 19 00 e9 fd 11 00 00 e8 b8 a4 26 fe e9 a7 02 00 00 e8 ae a4 26 fe 49 8d 7f 08 4d 8d 77 09 48 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 41 20 00 00 4c 89 f0 48 c1 e8 03 42 0f
RSP: 0018:ffffc9000d3e6320 EFLAGS: 00010202
RAX: 0000000000000001 RBX: ffff88804710de48 RCX: ffff88801a3c8000
RDX: 0000000000000000 RSI: 0000000000000400 RDI: 0000000000000008
RBP: ffffc9000d3e6a30 R08: ffffc9000d3e6c90 R09: 608b7c562adf3b03
R10: 23ec6d672c196c9a R11: 608b7c562adf3b03 R12: dffffc0000000000
R13: ffff88804710ddf8 R14: 0000000000000009 R15: 0000000000000000
FS: 00005555581f0380(0000) GS:ffff88808d255000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8847f56100 CR3: 0000000043298000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
__ocfs2_prepare_orphan_dir+0x145/0x2c0 fs/ocfs2/namei.c:2176
ocfs2_prepare_orphan_dir+0xf9/0x3f0 fs/ocfs2/namei.c:2221
ocfs2_add_inode_to_orphan+0x1d6/0x710 fs/ocfs2/namei.c:2669
ocfs2_dio_wr_get_block+0x7ea/0x1770 fs/ocfs2/aops.c:2183
get_more_blocks fs/direct-io.c:648 [inline]
do_direct_IO fs/direct-io.c:936 [inline]
__blockdev_direct_IO+0x16da/0x33d0 fs/direct-io.c:1243
ocfs2_direct_IO+0x25f/0x2d0 fs/ocfs2/aops.c:2438
generic_file_direct_write+0x1db/0x3e0 mm/filemap.c:4046
__generic_file_write_iter+0x11d/0x230 mm/filemap.c:4215
ocfs2_file_write_iter+0x157a/0x1d10 fs/ocfs2/file.c:2469
iter_file_splice_write+0x937/0x1000 fs/splice.c:738
do_splice_from fs/splice.c:935 [inline]
direct_splice_actor+0x101/0x160 fs/splice.c:1158
splice_direct_to_actor+0x5a5/0xcc0 fs/splice.c:1102
do_splice_direct_actor fs/splice.c:1201 [inline]
do_splice_direct+0x181/0x270 fs/splice.c:1227
do_sendfile+0x4da/0x7e0 fs/read_write.c:1370
__do_sys_sendfile64 fs/read_write.c:1431 [inline]
__se_sys_sendfile64+0x13e/0x190 fs/read_write.c:1417
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: 0033:0x7f8847edab99
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:00007ffd3d732a28 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 0031656c69662f2e RCX: 00007f8847edab99
RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000004
RBP: 00007f8847f525f0 R08: 0023706f6f6c2f76 R09: 00005555581f14c0
R10: 0000000080000002 R11: 0000000000000246 R12: 00007ffd3d732a50
R13: 00007ffd3d732c78 R14: 431bde82d7b634db R15: 00007f8847f2303b
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_find_dir_space_id fs/ocfs2/dir.c:3424 [inline]
RIP: 0010:ocfs2_prepare_dir_for_insert+0x2f41/0x5450 fs/ocfs2/dir.c:4288
Code: ca 8b e8 52 8f 19 00 e9 fd 11 00 00 e8 b8 a4 26 fe e9 a7 02 00 00 e8 ae a4 26 fe 49 8d 7f 08 4d 8d 77 09 48 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 41 20 00 00 4c 89 f0 48 c1 e8 03 42 0f
RSP: 0018:ffffc9000d3e6320 EFLAGS: 00010202
RAX: 0000000000000001 RBX: ffff88804710de48 RCX: ffff88801a3c8000
RDX: 0000000000000000 RSI: 0000000000000400 RDI: 0000000000000008
RBP: ffffc9000d3e6a30 R08: ffffc9000d3e6c90 R09: 608b7c562adf3b03
R10: 23ec6d672c196c9a R11: 608b7c562adf3b03 R12: dffffc0000000000
R13: ffff88804710ddf8 R14: 0000000000000009 R15: 0000000000000000
FS: 00005555581f0380(0000) GS:ffff88808d255000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8847f56100 CR3: 0000000043298000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 2 bytes skipped:
0: e8 52 8f 19 00 call 0x198f57
5: e9 fd 11 00 00 jmp 0x1207
a: e8 b8 a4 26 fe call 0xfe26a4c7
f: e9 a7 02 00 00 jmp 0x2bb
14: e8 ae a4 26 fe call 0xfe26a4c7
19: 49 8d 7f 08 lea 0x8(%r15),%rdi
1d: 4d 8d 77 09 lea 0x9(%r15),%r14
21: 48 89 f8 mov %rdi,%rax
24: 48 c1 e8 03 shr $0x3,%rax
* 28: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax <-- trapping instruction
2d: 84 c0 test %al,%al
2f: 0f 85 41 20 00 00 jne 0x2076
35: 4c 89 f0 mov %r14,%rax
38: 48 c1 e8 03 shr $0x3,%rax
3c: 42 rex.X
3d: 0f .byte 0xf


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