linux-kernel - [syzbot] [ocfs2?] general protection fault in ocfs2_clear

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Message-ID: <6745e28d.050a0220.1286eb.001e.GAE@google.com>
Date: Tue, 26 Nov 2024 07:00:29 -0800
From: syzbot <syzbot+b61ccbb38392c822082b@...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_clear_inode

Hello,

syzbot found the following issue on:

HEAD commit:    0a9b9d17f3a7 Merge tag 'pm-6.12-rc8' of git://git.kernel.o..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=127161a7980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=c3a3896a92fb300b
dashboard link: https://syzkaller.appspot.com/bug?extid=b61ccbb38392c822082b
compiler:       gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/4675f27017d1/disk-0a9b9d17.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/880b676fc240/vmlinux-0a9b9d17.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b54f7f03e699/bzImage-0a9b9d17.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b61ccbb38392c822082b@...kaller.appspotmail.com

RBP: 00007ffc6312dab0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc6312eb30
R13: 00007fc0479f15fc R14: 0000000000044f12 R15: 00007ffc6312eb70
 </TASK>
ocfs2: Unmounting device (7,3) on (node local)
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: 8245 Comm: syz-executor Not tainted 6.12.0-rc7-syzkaller-00070-g0a9b9d17f3a7 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
RIP: 0010:ocfs2_clear_inode+0x571/0x1430 fs/ocfs2/inode.c:1208
Code: 48 c1 ea 03 80 3c 02 00 0f 85 b7 07 00 00 49 8b 9e 90 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 08 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 d9 07 00 00 48 8b 7b 08 e8 7c 7b f7 fe 48 8b 4c
RSP: 0018:ffffc90002fdf890 EFLAGS: 00010212
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff836d638d
RDX: 0000000000000001 RSI: ffff888079b6d440 RDI: 0000000000000008
RBP: ffff888079b6cf50 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888079b6cea0
R13: 0000000000000000 R14: ffff88802a14c000 R15: ffff888079b6cb38
FS:  00005555850a7500(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000562453259680 CR3: 000000005e430000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 ocfs2_evict_inode+0x8d6/0x15d0 fs/ocfs2/inode.c:1220
 evict+0x40c/0x970 fs/inode.c:725
 iput_final fs/inode.c:1877 [inline]
 iput fs/inode.c:1903 [inline]
 iput+0x530/0x890 fs/inode.c:1889
 __ocfs2_free_slot_info.part.0+0x3e/0x210 fs/ocfs2/slot_map.c:307
 __ocfs2_free_slot_info fs/ocfs2/slot_map.c:304 [inline]
 ocfs2_free_slot_info+0x47/0x60 fs/ocfs2/slot_map.c:443
 ocfs2_delete_osb+0x52/0x1f0 fs/ocfs2/super.c:2502
 ocfs2_dismount_volume+0x442/0xa00 fs/ocfs2/super.c:1936
 generic_shutdown_super+0x15f/0x3d0 fs/super.c:642
 kill_block_super+0x3b/0x90 fs/super.c:1710
 deactivate_locked_super+0xc1/0x1a0 fs/super.c:473
 deactivate_super+0xde/0x100 fs/super.c:506
 cleanup_mnt+0x222/0x450 fs/namespace.c:1373
 task_work_run+0x151/0x250 kernel/task_work.c:239
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:114 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218
 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fc04797fa47
Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffc6312d9f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fc04797fa47
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc6312dab0
RBP: 00007ffc6312dab0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffc6312eb30
R13: 00007fc0479f15fc R14: 0000000000044f12 R15: 00007ffc6312eb70
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:ocfs2_clear_inode+0x571/0x1430 fs/ocfs2/inode.c:1208
Code: 48 c1 ea 03 80 3c 02 00 0f 85 b7 07 00 00 49 8b 9e 90 02 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 08 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 d9 07 00 00 48 8b 7b 08 e8 7c 7b f7 fe 48 8b 4c
RSP: 0018:ffffc90002fdf890 EFLAGS: 00010212
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff836d638d
RDX: 0000000000000001 RSI: ffff888079b6d440 RDI: 0000000000000008
RBP: ffff888079b6cf50 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888079b6cea0
R13: 0000000000000000 R14: ffff88802a14c000 R15: ffff888079b6cb38
FS:  00005555850a7500(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f8a5916131 CR3: 000000005e430000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	48 c1 ea 03          	shr    $0x3,%rdx
   4:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   8:	0f 85 b7 07 00 00    	jne    0x7c5
   e:	49 8b 9e 90 02 00 00 	mov    0x290(%r14),%rbx
  15:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  1c:	fc ff df
  1f:	48 8d 7b 08          	lea    0x8(%rbx),%rdi
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 d9 07 00 00    	jne    0x80d
  34:	48 8b 7b 08          	mov    0x8(%rbx),%rdi
  38:	e8 7c 7b f7 fe       	call   0xfef77bb9
  3d:	48                   	rex.W
  3e:	8b                   	.byte 0x8b
  3f:	4c                   	rex.WR


---
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