linux-kernel - WARNING in __check_heap

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Message-ID: <001a114096fec09301055d68d784@google.com>
Date:   Tue, 07 Nov 2017 10:36:01 -0800
From:   syzbot 
        <bot+2357afb48acb76780f3c18867ccfb7aa6fd6c4c9@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, cl@...ux.com, iamjoonsoo.kim@....com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        penberg@...nel.org, rientjes@...gle.com,
        syzkaller-bugs@...glegroups.com
Subject: WARNING in __check_heap_object

Hello,

syzkaller hit the following crash on  
5a3517e009e979f21977d362212b7729c5165d92
git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.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


------------[ cut here ]------------
WARNING: CPU: 1 PID: 2994 at mm/slab.c:4434 __check_heap_object+0xbc/0xd0  
mm/slab.c:4433
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 2994 Comm: syzkaller408738 Not tainted  
4.14.0-rc7-next-20171103+ #38
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+0x1c4/0x1e0 kernel/panic.c:546
  report_bug+0x211/0x2d0 lib/bug.c:184
  fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:177
  do_trap_no_signal arch/x86/kernel/traps.c:211 [inline]
  do_trap+0x260/0x390 arch/x86/kernel/traps.c:260
  do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:297
  do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:310
  invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:906
RIP: 0010:__check_heap_object+0xbc/0xd0 mm/slab.c:4433
RSP: 0018:ffff8801ce0670d8 EFLAGS: 00010282
RAX: 000000000000004a RBX: 0000000000000000 RCX: 0000000000000000
RDX: 000000000000004a RSI: 1ffff10039c0cddb RDI: ffffed0039c0ce0f
RBP: ffff8801ce0670e0 R08: 0000000000000001 R09: 0000000000000000
R10: ffff8801ceb0a500 R11: 0000000000000000 R12: ffffea00074a6c80
R13: ffff8801d29b26b0 R14: 000000000000000b R15: ffffea00074a6c80
  check_heap_object mm/usercopy.c:222 [inline]
  __check_object_size+0x22c/0x4f0 mm/usercopy.c:248
  check_object_size include/linux/thread_info.h:112 [inline]
  check_copy_size include/linux/thread_info.h:143 [inline]
  copy_to_user include/linux/uaccess.h:154 [inline]
  sctp_getsockopt_events net/sctp/socket.c:4972 [inline]
  sctp_getsockopt+0x2b90/0x70b0 net/sctp/socket.c:7012
  sock_common_getsockopt+0x95/0xd0 net/core/sock.c:2924
  SYSC_getsockopt net/socket.c:1882 [inline]
  SyS_getsockopt+0x178/0x340 net/socket.c:1864
  entry_SYSCALL_64_fastpath+0x1f/0xbe
RIP: 0033:0x43fca9
RSP: 002b:00007fff12a2dfa8 EFLAGS: 00000203 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fca9
RDX: 000000000000000b RSI: 0000000000000084 RDI: 0000000000000003
RBP: 0000000000000086 R08: 0000000020290000 R09: 0000000000000000
R10: 000000002099aff5 R11: 0000000000000203 R12: 0000000000401610
R13: 00000000004016a0 R14: 0000000000000000 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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