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Message-ID: <0000000000000abae605ef518834@google.com>
Date: Thu, 08 Dec 2022 06:05:37 -0800
From: syzbot <syzbot+2be9d17f9de2e7342994@...kaller.appspotmail.com>
To: agruenba@...hat.com, cluster-devel@...hat.com,
linux-kernel@...r.kernel.org, rpeterso@...hat.com,
syzkaller-bugs@...glegroups.com
Subject: [syzbot] general protection fault in gfs2_get_tree
Hello,
syzbot found the following issue on:
HEAD commit: 591cd61541b9 Add linux-next specific files for 20221207
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=172b534d880000
kernel config: https://syzkaller.appspot.com/x/.config?x=8b2d3e63e054c24f
dashboard link: https://syzkaller.appspot.com/bug?extid=2be9d17f9de2e7342994
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/bc862c01ec56/disk-591cd615.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/8f9b93f8ed2f/vmlinux-591cd615.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9d5cb636d548/bzImage-591cd615.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+2be9d17f9de2e7342994@...kaller.appspotmail.com
loop2: detected capacity change from 0 to 32768
general protection fault, probably for non-canonical address 0xdffffc000000001c: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000000e0-0x00000000000000e7]
CPU: 0 PID: 25472 Comm: syz-executor.2 Not tainted 6.1.0-rc8-next-20221207-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:gfs2_get_tree+0xb8/0x270 fs/gfs2/ops_fstype.c:1342
Code: 03 80 3c 02 00 0f 85 9f 01 00 00 4c 8b bb b0 00 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d bf e0 00 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 62 01 00 00 4d 8b b7 e0 00 00 00 48 b8 00 00 00
RSP: 0018:ffffc900068b7d50 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff888036c15800 RCX: ffffc9001a7a1000
RDX: 000000000000001c RSI: ffffffff83925ec7 RDI: 00000000000000e0
RBP: ffff888076c83200 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff888036c158b0 R14: ffff888036c15800 R15: 0000000000000000
FS: 00007fa57f6a0700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f68252516b0 CR3: 00000000876a2000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
vfs_get_tree+0x8d/0x2f0 fs/super.c:1489
do_new_mount fs/namespace.c:3145 [inline]
path_mount+0x132a/0x1e20 fs/namespace.c:3475
do_mount fs/namespace.c:3488 [inline]
__do_sys_mount fs/namespace.c:3697 [inline]
__se_sys_mount fs/namespace.c:3674 [inline]
__x64_sys_mount+0x283/0x300 fs/namespace.c:3674
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fa57e88d60a
Code: 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 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:00007fa57f69ff88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00000000000133e6 RCX: 00007fa57e88d60a
RDX: 0000000020013400 RSI: 0000000020013440 RDI: 00007fa57f69ffe0
RBP: 00007fa57f6a0020 R08: 00007fa57f6a0020 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020013400
R13: 0000000020013440 R14: 00007fa57f69ffe0 R15: 00000000200000c0
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:gfs2_get_tree+0xb8/0x270 fs/gfs2/ops_fstype.c:1342
Code: 03 80 3c 02 00 0f 85 9f 01 00 00 4c 8b bb b0 00 00 00 48 b8 00 00 00 00 00 fc ff df 49 8d bf e0 00 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 62 01 00 00 4d 8b b7 e0 00 00 00 48 b8 00 00 00
RSP: 0018:ffffc900068b7d50 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff888036c15800 RCX: ffffc9001a7a1000
RDX: 000000000000001c RSI: ffffffff83925ec7 RDI: 00000000000000e0
RBP: ffff888076c83200 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff888036c158b0 R14: ffff888036c15800 R15: 0000000000000000
FS: 00007fa57f6a0700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbc0fb821b8 CR3: 00000000876a2000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 03 80 3c 02 00 0f add 0xf00023c(%rax),%eax
6: 85 9f 01 00 00 4c test %ebx,0x4c000001(%rdi)
c: 8b bb b0 00 00 00 mov 0xb0(%rbx),%edi
12: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
19: fc ff df
1c: 49 8d bf e0 00 00 00 lea 0xe0(%r15),%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 62 01 00 00 jne 0x196
34: 4d 8b b7 e0 00 00 00 mov 0xe0(%r15),%r14
3b: 48 rex.W
3c: b8 .byte 0xb8
3d: 00 00 add %al,(%rax)
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
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