lkml.org 
[lkml]   [2021]   [Dec]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
Subject[syzbot] WARNING in console_unlock
From
Hello,

syzbot found the following issue on:

HEAD commit: ea922272cbe5 Add linux-next specific files for 20211210
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=12517ef5b00000
kernel config: https://syzkaller.appspot.com/x/.config?x=a2b5499ad0143759
dashboard link: https://syzkaller.appspot.com/bug?extid=c81440130f8669eb86d8
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.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+c81440130f8669eb86d8@syzkaller.appspotmail.com

DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
Modules linked in:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 9308 at include/trace/events/printk.h:10 trace_console_rcuidle include/trace/events/printk.h:10 [inline]
WARNING: CPU: 1 PID: 9308 at include/trace/events/printk.h:10 call_console_drivers kernel/printk/printk.c:1905 [inline]
WARNING: CPU: 1 PID: 9308 at include/trace/events/printk.h:10 console_unlock+0xabd/0xb70 kernel/printk/printk.c:2714
Modules linked in:
CPU: 1 PID: 9308 Comm: syz-executor.2 Not tainted 5.16.0-rc4-next-20211210-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:trace_console_rcuidle include/trace/events/printk.h:10 [inline]
RIP: 0010:call_console_drivers kernel/printk/printk.c:1905 [inline]
RIP: 0010:console_unlock+0xabd/0xb70 kernel/printk/printk.c:2714
Code: e3 ef 0e 00 00 00 00 48 8b bc 24 68 01 00 00 e8 69 c7 ff ff e9 35 ff ff ff e8 1f e7 18 00 0f 0b e9 17 fd ff ff e8 13 e7 18 00 <0f> 0b e9 6a fd ff ff 48 89 ef e8 24 df 63 00 e9 34 f7 ff ff e8 ea
RSP: 0018:fffffe0000053d40 EFLAGS: 00010046
RAX: 0000000080110000 RBX: 0000000000100000 RCX: 0000000000000000
RDX: ffff88801b238000 RSI: ffffffff815f146d RDI: 0000000000000003
RBP: fffffe0000053dd8 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff815f11d6 R11: 0000000000000000 R12: 000000000000000f
R13: 0000000000000000 R14: fffffe0000053d98 R15: dffffc0000000000
FS: 00007f83f79b2700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: fffffffffffffff8 CR3: 000000004313c000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<#DF>
console_unblank+0xfc/0x130 kernel/printk/printk.c:2779
bust_spinlocks+0x60/0xe0 lib/bust_spinlocks.c:28
oops_end+0x2b/0xf0 arch/x86/kernel/dumpstack.c:361
exc_double_fault+0x16d/0x180 arch/x86/kernel/traps.c:466
asm_exc_double_fault+0x1e/0x40 arch/x86/include/asm/idtentry.h:613
RIP: 0010:entry_SYSENTER_compat+0x3/0x17 arch/x86/entry/entry_64_compat.S:54
Code: 41 5c 5d 5b 41 5b 41 5a 41 59 41 58 58 59 5a 5e 5f 48 83 c4 30 fd 48 c7 44 24 28 00 00 00 00 48 cf cc cc cc cc cc cc 0f 01 f8 <50> 58 65 48 8b 24 25 10 70 02 00 6a 2b 6a 00 9c 6a 23 6a 00 89 c0
RSP: 0018:0000000000000000 EFLAGS: 00010046
RAX: 00000000000000d0 RBX: 0000000000018ff5 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00000000200193c0 R08: 0000000000000000 R09: 0000000020000280
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
</#DF>
----------------
Code disassembly (best guess):
0: 41 5c pop %r12
2: 5d pop %rbp
3: 5b pop %rbx
4: 41 5b pop %r11
6: 41 5a pop %r10
8: 41 59 pop %r9
a: 41 58 pop %r8
c: 58 pop %rax
d: 59 pop %rcx
e: 5a pop %rdx
f: 5e pop %rsi
10: 5f pop %rdi
11: 48 83 c4 30 add $0x30,%rsp
15: fd std
16: 48 c7 44 24 28 00 00 movq $0x0,0x28(%rsp)
1d: 00 00
1f: 48 cf iretq
21: cc int3
22: cc int3
23: cc int3
24: cc int3
25: cc int3
26: cc int3
27: 0f 01 f8 swapgs
* 2a: 50 push %rax <-- trapping instruction
2b: 58 pop %rax
2c: 65 48 8b 24 25 10 70 mov %gs:0x27010,%rsp
33: 02 00
35: 6a 2b pushq $0x2b
37: 6a 00 pushq $0x0
39: 9c pushfq
3a: 6a 23 pushq $0x23
3c: 6a 00 pushq $0x0
3e: 89 c0 mov %eax,%eax


---
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@googlegroups.com.

syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

\
 
 \ /
  Last update: 2021-12-18 15:50    [W:0.023 / U:0.404 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site