linux-kernel - [syzbot] [ocfs2?] general protection fault in ocfs2_prepare_dir_for

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Message-ID: <0000000000005894f3062018caf1@google.com>
Date: Tue, 20 Aug 2024 00:58:26 -0700
From: syzbot <syzbot+5a64828fcc4c2ad9b04f@...kaller.appspotmail.com>
To: jlbec@...lplan.org, joseph.qi@...ux.alibaba.com, 
	linux-kernel@...r.kernel.org, mark@...heh.com, ocfs2-devel@...ts.linux.dev, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [ocfs2?] general protection fault in ocfs2_prepare_dir_for_insert

Hello,

syzbot found the following issue on:

HEAD commit:    b0da640826ba Merge tag 'printk-for-6.11-rc5' of git://git...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=10d2076b980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=df2f0ed7e30a639d
dashboard link: https://syzkaller.appspot.com/bug?extid=5a64828fcc4c2ad9b04f
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=1680ffcb980000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=153aec05980000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7bc7510fe41f/non_bootable_disk-b0da6408.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/f630005f615b/vmlinux-b0da6408.xz
kernel image: https://storage.googleapis.com/syzbot-assets/4e3e4edbec91/bzImage-b0da6408.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/1a3cbd9c01e6/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+5a64828fcc4c2ad9b04f@...kaller.appspotmail.com

loop0: detected capacity change from 0 to 32768
JBD2: Ignoring recovery information on journal
ocfs2: Mounting device (7,0) on (node local, slot 0) with ordered data mode.
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]
CPU: 0 UID: 0 PID: 5096 Comm: syz-executor792 Not tainted 6.11.0-rc4-syzkaller-00002-gb0da640826ba #0
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:3406 [inline]
RIP: 0010:ocfs2_prepare_dir_for_insert+0x3309/0x5c70 fs/ocfs2/dir.c:4280
Code: 00 00 e8 2a 25 13 fe e9 ba 06 00 00 e8 20 25 13 fe e9 4f 01 00 00 e8 16 25 13 fe 49 8d 7f 08 49 8d 5f 09 48 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 bd 23 00 00 48 89 d8 48 c1 e8 03 42 0f
RSP: 0018:ffffc9000af9f020 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000009 RCX: ffff88801e27a440
RDX: 0000000000000000 RSI: 0000000000000400 RDI: 0000000000000008
RBP: ffffc9000af9f830 R08: ffffffff8380395b R09: ffffffff838090a7
R10: 0000000000000002 R11: ffff88801e27a440 R12: dffffc0000000000
R13: ffff88803c660878 R14: f700000000000088 R15: 0000000000000000
FS:  000055555a677380(0000) GS:ffff888020800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560bce569178 CR3: 000000001de5a000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 ocfs2_mknod+0xcaf/0x2b40 fs/ocfs2/namei.c:292
 vfs_mknod+0x36d/0x3b0 fs/namei.c:4088
 do_mknodat+0x3ec/0x5b0
 __do_sys_mknodat fs/namei.c:4166 [inline]
 __se_sys_mknodat fs/namei.c:4163 [inline]
 __x64_sys_mknodat+0xa7/0xc0 fs/namei.c:4163
 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: 0033:0x7f2dafda3a99
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:00007ffe336a6658 EFLAGS: 00000246 ORIG_RAX: 0000000000000103
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f2dafda3a99
RDX: 00000000000021c0 RSI: 0000000020000040 RDI: 00000000ffffff9c
RBP: 00007f2dafe1b5f0 R08: 0000000000004480 R09: 000055555a6784c0
R10: 0000000000000103 R11: 0000000000000246 R12: 00007ffe336a6680
R13: 00007ffe336a68a8 R14: 431bde82d7b634db R15: 00007f2dafdec03b
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_find_dir_space_id fs/ocfs2/dir.c:3406 [inline]
RIP: 0010:ocfs2_prepare_dir_for_insert+0x3309/0x5c70 fs/ocfs2/dir.c:4280
Code: 00 00 e8 2a 25 13 fe e9 ba 06 00 00 e8 20 25 13 fe e9 4f 01 00 00 e8 16 25 13 fe 49 8d 7f 08 49 8d 5f 09 48 89 f8 48 c1 e8 03 <42> 0f b6 04 20 84 c0 0f 85 bd 23 00 00 48 89 d8 48 c1 e8 03 42 0f
RSP: 0018:ffffc9000af9f020 EFLAGS: 00010202
RAX: 0000000000000001 RBX: 0000000000000009 RCX: ffff88801e27a440
RDX: 0000000000000000 RSI: 0000000000000400 RDI: 0000000000000008
RBP: ffffc9000af9f830 R08: ffffffff8380395b R09: ffffffff838090a7
R10: 0000000000000002 R11: ffff88801e27a440 R12: dffffc0000000000
R13: ffff88803c660878 R14: f700000000000088 R15: 0000000000000000
FS:  000055555a677380(0000) GS:ffff888020800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000560bce569178 CR3: 000000001de5a000 CR4: 0000000000350ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	e8 2a 25 13 fe       	call   0xfe132531
   7:	e9 ba 06 00 00       	jmp    0x6c6
   c:	e8 20 25 13 fe       	call   0xfe132531
  11:	e9 4f 01 00 00       	jmp    0x165
  16:	e8 16 25 13 fe       	call   0xfe132531
  1b:	49 8d 7f 08          	lea    0x8(%r15),%rdi
  1f:	49 8d 5f 09          	lea    0x9(%r15),%rbx
  23:	48 89 f8             	mov    %rdi,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 20       	movzbl (%rax,%r12,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 bd 23 00 00    	jne    0x23f4
  37:	48 89 d8             	mov    %rbx,%rax
  3a:	48 c1 e8 03          	shr    $0x3,%rax
  3e:	42                   	rex.X
  3f:	0f                   	.byte 0xf


---
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