linux-kernel - WARNING in task_participate_group

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Date:   Mon, 30 Oct 2017 12:12:03 -0700
From:   syzbot 
        <bot+c9f0eb0d2a5576ece331a767528e6b52b4ff1815@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, arvind.yadav.cs@...il.com,
        broonie@...nel.org, ebiederm@...ssion.com, fweisbec@...il.com,
        jamie.iles@...cle.com, linux-kernel@...r.kernel.org,
        martin.petersen@...cle.com, mchehab@...nel.org, mingo@...nel.org,
        mpe@...erman.id.au, syzkaller-bugs@...glegroups.com,
        viro@...iv.linux.org.uk
Subject: WARNING in task_participate_group_stop

Hello,

syzkaller hit the following crash on  
d95e159cd1da1ed4dbf76bf203e8ffaf231395e4
git://git.cmpxchg.org/linux-mmots.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: 1 at kernel/signal.c:340  
task_participate_group_stop+0x1ce/0x230 kernel/signal.c:340
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 1 Comm: init Not tainted 4.13.0-mm1+ #5
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  __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:task_participate_group_stop+0x1ce/0x230 kernel/signal.c:340
RSP: 0018:ffff8801d9ee77f0 EFLAGS: 00010097
RAX: ffff8801d9ed8040 RBX: ffff8801d9ed8040 RCX: ffff8801d9edb2c0
RDX: 0000000000000000 RSI: 0000000000060013 RDI: ffff8801d9ed84d0
RBP: ffff8801d9ee7808 R08: ffff8801d9ee7180 R09: ffff8801d9ee7178
R10: ffff8801d9ee70f0 R11: 1ffff1003b3db29b R12: ffff8801d9ee9740
R13: 0000000000000000 R14: dffffc0000000000 R15: ffff8801d9ed85c8
  do_signal_stop+0x217/0x900 kernel/signal.c:2042
  get_signal+0x61c/0x17e0 kernel/signal.c:2297
  do_signal+0x94/0x1ee0 arch/x86/kernel/signal.c:808
  exit_to_usermode_loop+0x224/0x300 arch/x86/entry/common.c:158
  prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
  syscall_return_slowpath+0x42f/0x500 arch/x86/entry/common.c:266
  entry_SYSCALL_64_fastpath+0xbc/0xbe
RIP: 0033:0x7f33f723fdd3
RSP: 002b:00007fffb5303398 EFLAGS: 00000246 ORIG_RAX: 0000000000000017
RAX: fffffffffffffdfe RBX: 00007fffb5303540 RCX: 00007f33f723fdd3
RDX: 0000000000000000 RSI: 00007fffb53036f0 RDI: 000000000000000b
RBP: 00007fffb53036f0 R08: 00007fffb5303770 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00007fffb5303ad0 R14: 0000000000000000 R15: 0000000000000000


---
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