linux-kernel - WARNING in __wake_up

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Date:   Thu, 28 Dec 2017 01:20:01 -0800
From:   syzbot <syzbot+aa0386edb3e128ffa315@...kaller.appspotmail.com>
To:     linux-kernel@...r.kernel.org, mingo@...hat.com,
        peterz@...radead.org, syzkaller-bugs@...glegroups.com
Subject: WARNING in __wake_up_common

Hello,

syzkaller hit the following crash on  
82bcf1def3b5f1251177ad47c44f7e17af039b4b
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


IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+aa0386edb3e128ffa315@...kaller.appspotmail.com
It will help syzbot understand when the bug is fixed. See footer for  
details.
If you forward the report, please keep this part and the footer.

audit: type=1400 audit(1513711793.237:7): avc:  denied  { map } for   
pid=3151 comm="syzkaller173649" path="/root/syzkaller173649879" dev="sda1"  
ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023  
tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1
WARNING: CPU: 1 PID: 3151 at kernel/sched/wait.c:79  
__wake_up_common+0x433/0x770 kernel/sched/wait.c:79
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 3151 Comm: syzkaller173649 Not tainted 4.15.0-rc2-mm1+ #39
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS  
Google 01/01/2011
Call Trace:
  __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:177
  fixup_bug arch/x86/kernel/traps.c:246 [inline]
  do_error_trap+0x2d7/0x3e0 arch/x86/kernel/traps.c:295
  do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:314
  invalid_op+0x22/0x40 arch/x86/entry/entry_64.S:1079
RIP: 0010:__wake_up_common+0x433/0x770 kernel/sched/wait.c:79
RSP: 0018:ffff8801c4897648 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8801d8cbfe50 RCX: 0000000000000004
RDX: 1ffffffff0c59731 RSI: ffff8801d8cbfe68 RDI: 0000000000000282
RBP: ffff8801c4897748 R08: ffff8801c4897858 R09: 0000000000000000
R10: 000000000000000b R11: ffffed0038912e48 R12: 0000000000000000
R13: ffff8801d8cbfe00 R14: 0000000000000001 R15: ffff8801c4897858
  __wake_up_locked_key+0x16/0x20 kernel/sched/wait.c:166
  userfaultfd_release+0x4da/0x750 fs/userfaultfd.c:885
  __fput+0x333/0x7f0 fs/file_table.c:210
  ____fput+0x15/0x20 fs/file_table.c:244
  task_work_run+0x199/0x270 kernel/task_work.c:113
  exit_task_work include/linux/task_work.h:22 [inline]
  do_exit+0x9bb/0x1ae0 kernel/exit.c:869
  do_group_exit+0x149/0x400 kernel/exit.c:972
  SYSC_exit_group kernel/exit.c:983 [inline]
  SyS_exit_group+0x1d/0x20 kernel/exit.c:981
  entry_SYSCALL_64_fastpath+0x1f/0x96
RIP: 0033:0x43e848
RSP: 002b:00007ffe33766e08 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 00000000006ca800 RCX: 000000000043e848
RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000
RBP: 00000000000014b1 R08: 00000000000000e7 R09: ffffffffffffffd0
R10: 0000000000000006 R11: 0000000000000246 R12: 00000000006ca858
R13: 00000000006ca858 R14: 0000000000000000 R15: 0000000000002710
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
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