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Date:   Fri, 12 Jan 2018 15:58:01 -0800
From:   syzbot <syzbot+c0ea2226f77a42936bf7@...kaller.appspotmail.com>
To:     adobriyan@...il.com, davem@...emloft.net,
        gregkh@...uxfoundation.org, kraig@...gle.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        pombredanne@...b.com, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de
Subject: WARNING in reuseport_add_sock

Hello,

syzkaller hit the following crash on  
30a7acd573899fd8b8ac39236eff6468b195ac7d
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+c0ea2226f77a42936bf7@...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.

------------[ cut here ]------------
socket already in reuseport group
WARNING: CPU: 0 PID: 3496 at net/core/sock_reuseport.c:119  
reuseport_add_sock+0x742/0x9b0 net/core/sock_reuseport.c:117
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 3496 Comm: syzkaller869503 Not tainted 4.15.0-rc6+ #245
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:reuseport_add_sock+0x742/0x9b0 net/core/sock_reuseport.c:117
RSP: 0018:ffff8801bf5f7968 EFLAGS: 00010286
RAX: dffffc0000000008 RBX: ffff8801bf4905c0 RCX: ffffffff8159d9de
RDX: 0000000000000000 RSI: 1ffff10037ebeee8 RDI: 0000000000000293
RBP: ffff8801bf5f7b00 R08: 1ffff10037ebeeaa R09: 0000000000000000
R10: ffff8801bf5f7820 R11: 0000000000000000 R12: 1ffff10037ebef37
R13: ffff8801bf47b930 R14: ffff8801bf5f7ad8 R15: 1ffff10037ebef3b
  inet_reuseport_add_sock net/ipv4/inet_hashtables.c:456 [inline]
  __inet_hash+0x767/0xb90 net/ipv4/inet_hashtables.c:477
  inet_hash+0x61/0x90 net/ipv4/inet_hashtables.c:501
  inet_csk_listen_start+0x38f/0x460 net/ipv4/inet_connection_sock.c:885
  inet_listen+0x19a/0x440 net/ipv4/af_inet.c:228
  SYSC_listen net/socket.c:1483 [inline]
  SyS_listen+0x1aa/0x350 net/socket.c:1469
  entry_SYSCALL_64_fastpath+0x23/0x9a
RIP: 0033:0x445639
RSP: 002b:00007f2966197db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000032
RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000445639
RDX: 0000000000445639 RSI: 0000000000000000 RDI: 0000000000000006
RBP: 00000000006dac20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc328a273f R14: 00007f29661989c0 R15: 0000000000000008
Dumping ftrace buffer:
    (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
This bug is generated by a dumb bot. It may contain errors.
See https://goo.gl/tpsmEJ for details.
Direct all questions to syzkaller@...glegroups.com.

syzbot will keep track of this bug report.
If you forgot to add the Reported-by tag, once the fix for this bug is  
merged
into any tree, please reply to this email with:
#syz fix: exact-commit-title
If you want to test a patch for this bug, please reply with:
#syz test: git://repo/address.git branch
and provide the patch inline or as an attachment.
To mark this as a duplicate of another syzbot report, please reply with:
#syz dup: exact-subject-of-another-report
If it's a one-off invalid bug report, please reply with:
#syz invalid
Note: if the crash happens again, it will cause creation of a new bug  
report.
Note: all commands must start from beginning of the line in the email body.

View attachment "config.txt" of type "text/plain" (134059 bytes)

Download attachment "raw.log" of type "application/octet-stream" (5837 bytes)

View attachment "repro.txt" of type "text/plain" (723 bytes)

Download attachment "repro.c" of type "application/octet-stream" (3381 bytes)

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