Date:   Wed, 17 Jan 2018 05:58:01 -0800
From:   syzbot <syzbot+e64565577af34b3768dc@...kaller.appspotmail.com>
To:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        syzkaller-bugs@...glegroups.com
Subject: WARNING in dev_vprintk_emit

Hello,

syzkaller hit the following crash on  
c92a9a461dff6140c539c61e457aa97df29517d6
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.
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+e64565577af34b3768dc@...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.

WARNING: CPU: 1 PID: 3652 at drivers/base/core.c:2884 create_syslog_header  
drivers/base/core.c:2884 [inline]
WARNING: CPU: 1 PID: 3652 at drivers/base/core.c:2884  
dev_vprintk_emit+0x159/0x510 drivers/base/core.c:2894
Kernel panic - not syncing: panic_on_warn set ...

CPU: 1 PID: 3652 Comm: syzkaller376059 Not tainted 4.15.0-rc7+ #260
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: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:1079
RIP: 0010:create_syslog_header drivers/base/core.c:2884 [inline]
RIP: 0010:dev_vprintk_emit+0x159/0x510 drivers/base/core.c:2894
RSP: 0018:ffff8801bc40ee68 EFLAGS: 00010286
RAX: dffffc0000000008 RBX: ffff8801bc080980 RCX: ffffffff8159da9e
RDX: 0000000000000000 RSI: 1ffff100378f9d2d RDI: 0000000000000293
RBP: ffff8801bc40efa8 R08: 1ffff10037881d60 R09: 0000000000000000
R10: ffff8801bc40f090 R11: 0000000000000000 R12: 1ffff10037881dd4
R13: ffff8801d472c400 R14: ffff8801bc40eec0 R15: ffff8801bc40efe0
  dev_printk_emit+0xc0/0xf0 drivers/base/core.c:2907
  __dev_printk+0xa7/0x120 drivers/base/core.c:2919
  dev_printk+0x111/0x170 drivers/base/core.c:2936
  ieee80211_init_rate_ctrl_alg+0x2d5/0x4a0 net/mac80211/rate.c:978
  ieee80211_register_hw+0x1448/0x3100 net/mac80211/main.c:1091
  mac80211_hwsim_new_radio+0x1b2e/0x2b90  
drivers/net/wireless/mac80211_hwsim.c:2700
  hwsim_new_radio_nl+0x5b7/0x7c0 drivers/net/wireless/mac80211_hwsim.c:3152
  genl_family_rcv_msg+0x7b7/0xfb0 net/netlink/genetlink.c:599
  genl_rcv_msg+0xb2/0x140 net/netlink/genetlink.c:624
  netlink_rcv_skb+0x224/0x470 net/netlink/af_netlink.c:2408
  genl_rcv+0x28/0x40 net/netlink/genetlink.c:635
  netlink_unicast_kernel net/netlink/af_netlink.c:1275 [inline]
  netlink_unicast+0x4ee/0x700 net/netlink/af_netlink.c:1301
  netlink_sendmsg+0xa4a/0xe60 net/netlink/af_netlink.c:1864
  sock_sendmsg_nosec net/socket.c:638 [inline]
  sock_sendmsg+0xca/0x110 net/socket.c:648
  ___sys_sendmsg+0x767/0x8b0 net/socket.c:2028
  __sys_sendmsg+0xe5/0x210 net/socket.c:2062
  SYSC_sendmsg net/socket.c:2073 [inline]
  SyS_sendmsg+0x2d/0x50 net/socket.c:2069
  entry_SYSCALL_64_fastpath+0x23/0x9a
RIP: 0033:0x43fd89
RSP: 002b:00007ffe0ab23e98 EFLAGS: 00000203 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fd89
RDX: 0000000000000000 RSI: 0000000020b3dfc8 RDI: 0000000000000003
RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000203 R12: 00000000004016f0
R13: 0000000000401780 R14: 0000000000000000 R15: 0000000000000000
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
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