linux-kernel - WARNING in do

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Date:   Tue, 31 Oct 2017 04:34:01 -0700
From:   syzbot 
        <bot+adbefe6736a5b37af36f19ebfa8764fcdd9ddaed@...kaller.appspotmail.com>
To:     linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de
Subject: WARNING in do_debug

Hello,

syzkaller hit the following crash on  
0787643a5f6aad1f0cdeb305f7fe492b71943ea4
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.

syzkaller reproducer is attached. See https://goo.gl/kgGztJ
for information about syzkaller reproducers


------------[ cut here ]------------
WARNING: CPU: 0 PID: 3045 at arch/x86/kernel/traps.c:776  
cond_local_irq_disable arch/x86/kernel/traps.c:85 [inline]
WARNING: CPU: 0 PID: 3045 at arch/x86/kernel/traps.c:776  
do_debug+0x4d8/0x6e0 arch/x86/kernel/traps.c:790
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 3045 Comm: syz-executor6 Not tainted 4.14.0-rc5+ #142
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  <#DB>
  __dump_stack lib/dump_stack.c:16 [inline]
  dump_stack+0x194/0x257 lib/dump_stack.c:52
  panic+0x1e4/0x417 kernel/panic.c:181
  __warn+0x1c4/0x1d9 kernel/panic.c:542
  report_bug+0x211/0x2d0 lib/bug.c:183
  fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:178
  do_trap_no_signal arch/x86/kernel/traps.c:212 [inline]
  do_trap+0x260/0x390 arch/x86/kernel/traps.c:261
  do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:298
  do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:311
  invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:905
RIP: 0010:cond_local_irq_disable arch/x86/kernel/traps.c:85 [inline]
RIP: 0010:do_debug+0x4d8/0x6e0 arch/x86/kernel/traps.c:790
RSP: 0018:ffff8801db20fe98 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffff8801db20ff58 RCX: 0000000000000000
RDX: 1ffff1003b641ffc RSI: 0000000000000001 RDI: ffffffff85ac6398
RBP: ffff8801db20ff48 R08: ffff8801db20ffe8 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000004001
R13: ffff8801cd8541c0 R14: 1ffff1003b641fd8 R15: 0000000000004000
  debug+0x34/0x70 arch/x86/entry/entry_64.S:1056
RIP: 0010:copy_user_enhanced_fast_string+0xe/0x20  
arch/x86/lib/copy_user_64.S:180
RSP: 0018:ffff8801cd2cfe68 EFLAGS: 00010246
RAX: ffffed0039a59fe1 RBX: 0000000020000000 RCX: 000000000000003f
RDX: 0000000000000040 RSI: 0000000020000001 RDI: ffff8801cd2cfec9
RBP: ffff8801cd2cfe98 R08: ffffed0039a59fe1 R09: ffffed0039a59fe1
R10: 0000000000000008 R11: ffffed0039a59fe0 R12: 0000000000000040
R13: ffff8801cd2cfec8 R14: 00007ffffffff000 R15: 0000000020000040
  </#DB>
  copy_from_user include/linux/uaccess.h:146 [inline]
  SYSC_timer_create kernel/time/posix-timers.c:579 [inline]
  SyS_timer_create+0x89/0x120 kernel/time/posix-timers.c:572
  entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x452719
RSP: 002b:00007f906f324be8 EFLAGS: 00000212 ORIG_RAX: 00000000000000de
RAX: ffffffffffffffda RBX: 0000000000758020 RCX: 0000000000452719
RDX: 0000000020000000 RSI: 0000000020000000 RDI: ffffffffffffffff
RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f3cf8
R13: 00000000ffffffff R14: 00007f906f3256d4 R15: 0000000000000000
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
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See https://goo.gl/tpsmEJ for details.
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