Hello,
syzbot found the following issue on:
HEAD commit: 97ec4d559d93 Merge tag 'block-6.2-2023-01-13' of git://git..
git tree: upstream
console output:
https://syzkaller.appspot.com/x/log.txt?x=167e2089480000
kernel config:
https://syzkaller.appspot.com/x/.config?x=ebc110f9741920ed
dashboard link:
https://syzkaller.appspot.com/bug?extid=5698f44ff59493076ae3
compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
CC: [
linux-...@vger.kernel.org linux-...@vger.kernel.org mik...@szeredi.hu]
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image:
https://storage.googleapis.com/syzbot-assets/46f8c907cf5f/disk-97ec4d55.raw.xz
vmlinux:
https://storage.googleapis.com/syzbot-assets/df0994e6fa24/vmlinux-97ec4d55.xz
kernel image:
https://storage.googleapis.com/syzbot-assets/59f096ab07dd/bzImage-97ec4d55.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by:
syzbot+5698f4...@syzkaller.appspotmail.com
overlayfs: upper fs does not support tmpfile.
overlayfs: upper fs does not support RENAME_WHITEOUT.
REISERFS warning (device loop5): super-6502 reiserfs_getopt: unknown mount option "��<<�G4��mR���� u����0� �w�2���� �����"
BUG: unable to handle page fault for address: fffffffffff8d26f
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD d08f067 P4D d08f067 PUD d091067 PMD 0
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 16656 Comm: syz-executor.5 Not tainted 6.2.0-rc3-syzkaller-00349-g97ec4d559d93 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
RIP: 0010:ovl_create_over_whiteout fs/overlayfs/dir.c:494 [inline]
RIP: 0010:ovl_create_or_link+0xe82/0x1460 fs/overlayfs/dir.c:613
Code: 02 00 00 4c 89 e3 48 83 c3 68 48 89 d8 48 c1 e8 03 48 89 44 24 60 42 80 3c 28 00 74 08 48 89 df e8 73 79 e6 fe 48 89 5c 24 68 <48> 8b 1b 48 89 d8 48 c1 e8 03 42 8a 04 28 84 c0 0f 85 48 05 00 00
RSP: 0018:ffffc90016857ae0 EFLAGS: 00010246
RAX: 1fffffffffff1a4d RBX: fffffffffff8d26f RCX: 0000000000000002
RDX: ffff888020311d40 RSI: 0000000000004000 RDI: 000000000000a000
RBP: ffffc90016857c90 R08: ffffffff82fb0b9a R09: ffffed100f160c42
R10: ffffed100f160c42 R11: 1ffff1100f160c41 R12: fffffffffff8d207
R13: dffffc0000000000 R14: 0000000000004000 R15: ffff888078b06bc0
FS: 00007f7d1c446700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffff8d26f CR3: 000000005e659000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<TASK>
ovl_create_object+0x23e/0x370 fs/overlayfs/dir.c:647
vfs_mkdir+0x3b3/0x590 fs/namei.c:4036
do_mkdirat+0x25b/0x530 fs/namei.c:4061
__do_sys_mkdir fs/namei.c:4081 [inline]
__se_sys_mkdir fs/namei.c:4079 [inline]
__x64_sys_mkdir+0x6a/0x80 fs/namei.c:4079
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f7d1b68c0c9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 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:00007f7d1c446168 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007f7d1b7abf80 RCX: 00007f7d1b68c0c9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200001c0
RBP: 00007f7d1b6e7ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffd2255c2f R14: 00007f7d1c446300 R15: 0000000000022000
</TASK>
Modules linked in:
CR2: fffffffffff8d26f
---[ end trace 0000000000000000 ]---
RIP: 0010:ovl_create_over_whiteout fs/overlayfs/dir.c:494 [inline]
RIP: 0010:ovl_create_or_link+0xe82/0x1460 fs/overlayfs/dir.c:613
Code: 02 00 00 4c 89 e3 48 83 c3 68 48 89 d8 48 c1 e8 03 48 89 44 24 60 42 80 3c 28 00 74 08 48 89 df e8 73 79 e6 fe 48 89 5c 24 68 <48> 8b 1b 48 89 d8 48 c1 e8 03 42 8a 04 28 84 c0 0f 85 48 05 00 00
RSP: 0018:ffffc90016857ae0 EFLAGS: 00010246
RAX: 1fffffffffff1a4d RBX: fffffffffff8d26f RCX: 0000000000000002
RDX: ffff888020311d40 RSI: 0000000000004000 RDI: 000000000000a000
RBP: ffffc90016857c90 R08: ffffffff82fb0b9a R09: ffffed100f160c42
R10: ffffed100f160c42 R11: 1ffff1100f160c41 R12: fffffffffff8d207
R13: dffffc0000000000 R14: 0000000000004000 R15: ffff888078b06bc0
FS: 00007f7d1c446700(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffff8d26f CR3: 000000005e659000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
0: 02 00 add (%rax),%al
2: 00 4c 89 e3 add %cl,-0x1d(%rcx,%rcx,4)
6: 48 83 c3 68 add $0x68,%rbx
a: 48 89 d8 mov %rbx,%rax
d: 48 c1 e8 03 shr $0x3,%rax
11: 48 89 44 24 60 mov %rax,0x60(%rsp)
16: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1)
1b: 74 08 je 0x25
1d: 48 89 df mov %rbx,%rdi
20: e8 73 79 e6 fe callq 0xfee67998
25: 48 89 5c 24 68 mov %rbx,0x68(%rsp)
* 2a: 48 8b 1b mov (%rbx),%rbx <-- trapping instruction
2d: 48 89 d8 mov %rbx,%rax
30: 48 c1 e8 03 shr $0x3,%rax
34: 42 8a 04 28 mov (%rax,%r13,1),%al
38: 84 c0 test %al,%al
3a: 0f 85 48 05 00 00 jne 0x588
---
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
syzk...@googlegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.