Message-ID: <001a1144c4ca5dc9d6056520c7b7@google.com>
Date:   Tue, 13 Feb 2018 15:59:01 -0800
From:   syzbot <syzbot+1a240cdb1f4cc88819df@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, dhowells@...hat.com, hannes@...xchg.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org, mhocko@...e.com,
        mingo@...nel.org, rppt@...ux.vnet.ibm.com,
        syzkaller-bugs@...glegroups.com, vbabka@...e.cz,
        viro@...iv.linux.org.uk
Subject: WARNING in kvmalloc_node

Hello,

syzbot hit the following crash on bpf-next commit
7928b2cbe55b2a410a0f5c1f154610059c57b1b2 (Sun Feb 11 23:04:29 2018 +0000)
Linux 4.16-rc1

So far this crash happened 236 times on bpf-next.
C reproducer is attached.
syzkaller reproducer is attached.
Raw console output is attached.
compiler: gcc (GCC) 7.1.1 20170620
.config is attached.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+1a240cdb1f4cc88819df@...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(1518457683.474:7): avc:  denied  { map } for   
pid=4183 comm="syzkaller238030" path="/root/syzkaller238030826" 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: 4183 at mm/util.c:403 kvmalloc_node+0xc3/0xd0  
mm/util.c:403
audit: type=1400 audit(1518457683.474:8): avc:  denied  { map_create } for   
pid=4183 comm="syzkaller238030"  
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023  
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=bpf  
permissive=1
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 4183 Comm: syzkaller238030 Not tainted 4.16.0-rc1+ #12
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
audit: type=1400 audit(1518457683.474:9): avc:  denied  { map_read  
map_write } for  pid=4183 comm="syzkaller238030"  
scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023  
tcontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tclass=bpf  
permissive=1
  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:988
RIP: 0010:kvmalloc_node+0xc3/0xd0 mm/util.c:403
RSP: 0018:ffff8801b436f6e8 EFLAGS: 00010293
RAX: ffff8801b1dd25c0 RBX: 0000000001088220 RCX: ffffffff81970ca3
RDX: 0000000000000000 RSI: 0000000001088220 RDI: 0000000000000070
RBP: ffff8801b436f708 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000070
R13: 0000000000000000 R14: 00000000ffffffff R15: ffff8801d304cd00
  kvmalloc include/linux/mm.h:541 [inline]
  kvmalloc_array include/linux/mm.h:557 [inline]
  __ptr_ring_init_queue_alloc include/linux/ptr_ring.h:474 [inline]
  ptr_ring_init include/linux/ptr_ring.h:492 [inline]
  __cpu_map_entry_alloc kernel/bpf/cpumap.c:359 [inline]
  cpu_map_update_elem+0x3c3/0x8e0 kernel/bpf/cpumap.c:490
  map_update_elem kernel/bpf/syscall.c:698 [inline]
  SYSC_bpf kernel/bpf/syscall.c:1872 [inline]
  SyS_bpf+0x215f/0x4860 kernel/bpf/syscall.c:1843
  do_syscall_64+0x282/0x940 arch/x86/entry/common.c:287
  entry_SYSCALL_64_after_hwframe+0x26/0x9b
RIP: 0033:0x43fda9
RSP: 002b:00007ffe6b075798 EFLAGS: 00000203 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 000000000043fda9
RDX: 0000000000000020 RSI: 0000000020ef4fe0 RDI: 0000000000000002
RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000203 R12: 00000000004016d0
R13: 0000000000401760 R14: 0000000000000000 R15: 0000000000000000
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
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View attachment "raw.log.txt" of type "text/plain" (6321 bytes)

View attachment "repro.syz.txt" of type "text/plain" (572 bytes)

View attachment "repro.c.txt" of type "text/plain" (1343 bytes)

View attachment "config.txt" of type "text/plain" (136427 bytes)

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