linux-kernel - WARNING in do

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Date:   Mon, 25 Dec 2017 16:22:00 -0800
From:   syzbot 
        <syzbot+adbefe6736a5b37af36f19ebfa8764fcdd9ddaed@...kaller.appspotmail.com>
To:     david@...hat.com, dvyukov@...gle.com, haozhong.zhang@...el.com,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        mingo@...hat.com, pbonzini@...hat.com, rkrcmar@...hat.com,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de
Subject: WARNING in do_debug

syzkaller has found reproducer for the following crash on  
464e1d5f23cca236b930ef068c328a64cab78fb1
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/master
compiler: gcc (GCC) 7.1.1 20170620
.config is attached
Raw console output is attached.
C reproducer is attached
syzkaller reproducer is attached. See https://goo.gl/kgGztJ
for information about syzkaller reproducers


WARNING: CPU: 0 PID: 3356 at arch/x86/kernel/traps.c:801  
cond_local_irq_disable arch/x86/kernel/traps.c:86 [inline]
WARNING: CPU: 0 PID: 3356 at arch/x86/kernel/traps.c:801  
do_debug+0x4d8/0x6e0 arch/x86/kernel/traps.c:815
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 3356 Comm: syzkaller834441 Not tainted 4.15.0-rc5+ #237
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  <#DB>
  __dump_stack lib/dump_stack.c:17 [inline]
  dump_stack+0x194/0x257 lib/dump_stack.c:53
  panic+0x1e4/0x41c kernel/panic.c:183
  __warn+0x1dc/0x200 kernel/panic.c:547
  report_bug+0x211/0x2d0 lib/bug.c:184
  fixup_bug.part.11+0x37/0x80 arch/x86/kernel/traps.c:178
  fixup_bug arch/x86/kernel/traps.c:247 [inline]
  do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:296
  do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:315
  invalid_op+0x22/0x40 arch/x86/entry/entry_64.S:1061
RIP: 0010:cond_local_irq_disable arch/x86/kernel/traps.c:86 [inline]
RIP: 0010:do_debug+0x4d8/0x6e0 arch/x86/kernel/traps.c:815
RSP: 0018:fffffe800000ee98 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: fffffe800000ef58 RCX: 0000000000000000
RDX: 1fffffd000001dfc RSI: 0000000000000001 RDI: ffffffff85ec81f8
RBP: fffffe800000ef48 R08: fffffe800000efe8 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 000000000000e003
R13: ffff8801c2340040 R14: 1fffffd000001dd8 R15: 0000000000004000
  debug+0x34/0x60 arch/x86/entry/entry_64.S:1214
RIP: 0010:__put_user_8+0x1f/0x25 arch/x86/lib/putuser.S:83
RSP: 0018:ffff8801c9f8ff28 EFLAGS: 00000293
RAX: 000000005a4195b6 RBX: 00007fffffffeff9 RCX: 0000000020000000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000282
RBP: ffff8801c9f8ff48 R08: 0000000000000000 R09: 1ffff100393f1fc2
R10: ffff8801c9f8fdd8 R11: 0000000000000000 R12: 000000005a4195b6
R13: 0000000020000000 R14: 00007f2c937f99c0 R15: 0000000000000001
  </#DB>
  entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x44aef9
RSP: 002b:00007f2c937f8ce8 EFLAGS: 00000206 ORIG_RAX: 00000000000000c9
RAX: ffffffffffffffda RBX: 00000000006dcc24 RCX: 000000000044aef9
RDX: 000000000044aef9 RSI: 000000000044aef9 RDI: 0000000020000000
RBP: 00000000006dcc20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ffe9191073f R14: 00007f2c937f99c0 R15: 0000000000000001
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


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