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Date: Mon, 22 Jan 2024 10:21:23 -0800
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Subject: [syzbot] [jfs?] general protection fault in diRead (2)
From: syzbot <syzbot+8f731999dc47797f064f@syzkaller.appspotmail.com>
To: jfs-discussion@lists.sourceforge.net, linux-fsdevel@vger.kernel.org, 
	linux-kernel@vger.kernel.org, shaggy@kernel.org, 
	syzkaller-bugs@googlegroups.com
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Hello,

syzbot found the following issue on:

HEAD commit:    6613476e225e Linux 6.8-rc1
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17dc7427e80000
kernel config:  https://syzkaller.appspot.com/x/.config?x=909746d6edb125d7
dashboard link: https://syzkaller.appspot.com/bug?extid=8f731999dc47797f064f
compiler:       Debian clang version 15.0.6, 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/d0edbd1edbe1/disk-6613476e.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9a389b6bdd04/vmlinux-6613476e.xz
kernel image: https://storage.googleapis.com/syzbot-assets/eedf993f8f5d/bzImage-6613476e.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+8f731999dc47797f064f@syzkaller.appspotmail.com

general protection fault, probably for non-canonical address 0xdffffc0000000104: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000820-0x0000000000000827]
CPU: 0 PID: 6815 Comm: syz-executor.3 Not tainted 6.8.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
RIP: 0010:diIAGRead fs/jfs/jfs_imap.c:2662 [inline]
RIP: 0010:diRead+0x158/0xae0 fs/jfs/jfs_imap.c:316
Code: 8d 5d 80 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 69 d4 d7 fe 4c 8b 2b 49 8d 9d 20 08 00 00 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 49 d4 d7 fe 4c 8b 3b 49 8d 5f 28
RSP: 0018:ffffc9000486f658 EFLAGS: 00010202
RAX: 0000000000000104 RBX: 0000000000000820 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000000000000008 RDI: 0000000000000001
RBP: ffff888037fbf330 R08: ffff888037fbefd7 R09: 1ffff11006ff7dfa
R10: dffffc0000000000 R11: ffffed1006ff7dfb R12: 0000000000000004
R13: 0000000000000000 R14: ffff888037fbefc8 R15: dffffc0000000000
FS:  00007f5fd8fbd6c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020010000 CR3: 000000007909f000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 jfs_iget+0x8c/0x3b0 fs/jfs/inode.c:35
 jfs_lookup+0x226/0x410 fs/jfs/namei.c:1469
 lookup_open fs/namei.c:3474 [inline]
 open_last_lookups fs/namei.c:3565 [inline]
 path_openat+0x1012/0x31e0 fs/namei.c:3795
 do_filp_open+0x234/0x490 fs/namei.c:3825
 do_sys_openat2+0x13e/0x1d0 fs/open.c:1404
 do_sys_open fs/open.c:1419 [inline]
 __do_sys_open fs/open.c:1427 [inline]
 __se_sys_open fs/open.c:1423 [inline]
 __x64_sys_open+0x225/0x270 fs/open.c:1423
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf5/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f5fd9c7cda9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5fd8fbd0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f5fd9dac120 RCX: 00007f5fd9c7cda9
RDX: 0000000000000000 RSI: 0000000000088043 RDI: 00000000200022c0
RBP: 00007f5fd9cc947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f5fd9dac120 R15: 00007ffe5a2a8968
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:diIAGRead fs/jfs/jfs_imap.c:2662 [inline]
RIP: 0010:diRead+0x158/0xae0 fs/jfs/jfs_imap.c:316
Code: 8d 5d 80 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 69 d4 d7 fe 4c 8b 2b 49 8d 9d 20 08 00 00 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 49 d4 d7 fe 4c 8b 3b 49 8d 5f 28
RSP: 0018:ffffc9000486f658 EFLAGS: 00010202
RAX: 0000000000000104 RBX: 0000000000000820 RCX: 0000000000000001
RDX: 0000000000000001 RSI: 0000000000000008 RDI: 0000000000000001
RBP: ffff888037fbf330 R08: ffff888037fbefd7 R09: 1ffff11006ff7dfa
R10: dffffc0000000000 R11: ffffed1006ff7dfb R12: 0000000000000004
R13: 0000000000000000 R14: ffff888037fbefc8 R15: dffffc0000000000
FS:  00007f5fd8fbd6c0(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0a9d2d66e4 CR3: 000000007909f000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	8d 5d 80             	lea    -0x80(%rbp),%ebx
   3:	48 89 d8             	mov    %rbx,%rax
   6:	48 c1 e8 03          	shr    $0x3,%rax
   a:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1)
   f:	74 08                	je     0x19
  11:	48 89 df             	mov    %rbx,%rdi
  14:	e8 69 d4 d7 fe       	call   0xfed7d482
  19:	4c 8b 2b             	mov    (%rbx),%r13
  1c:	49 8d 9d 20 08 00 00 	lea    0x820(%r13),%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 49 d4 d7 fe       	call   0xfed7d482
  39:	4c 8b 3b             	mov    (%rbx),%r15
  3c:	49 8d 5f 28          	lea    0x28(%r15),%rbx


---
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