device bridge_slave_1 left promiscuous mode
bridge0: port 2(bridge_slave_1) entered disabled state
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 14202 Comm: syz-executor4 Not tainted 4.19.0-rc3-next-20180912+ #72
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:mqueue_get_tree+0x147/0x2e0 ipc/mqueue.c:363
Code: 03 80 3c 02 00 0f 85 93 01 00 00 49 8d bd c8 00 00 00 4c 89 ab 98 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 60 01 00 00 4d 8b ad c8 00 00 00 be 04 00 00 00
RSP: 0018:ffff880146337928 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8801d789da80 RCX: ffffffff8160aca1
RDX: 0000000000000019 RSI: ffffffff833deb76 RDI: 00000000000000c8
RBP: ffff880146337948 R08: fffffbfff13555fd R09: fffffbfff13555fc
R10: fffffbfff13555fc R11: ffffffff89aaafe3 R12: ffff8801cf7c0bc0
R13: 0000000000000000 R14: ffff8801d789db18 R15: ffff8801d789db18
FS:  0000000001e81940(0000) GS:ffff8801dad00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000482e00 CR3: 00000001cdeb4000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 vfs_get_tree+0x1cb/0x5c0 fs/super.c:1787
 mq_create_mount+0xe3/0x190 ipc/mqueue.c:415
 mq_init_ns+0x15a/0x210 ipc/mqueue.c:1621
 create_ipc_ns ipc/namespace.c:58 [inline]
 copy_ipcs+0x3d2/0x580 ipc/namespace.c:84
 create_new_namespaces+0x376/0x900 kernel/nsproxy.c:87
 unshare_nsproxy_namespaces+0xc3/0x1f0 kernel/nsproxy.c:206
 ksys_unshare+0x79c/0x10b0 kernel/fork.c:2535
 __do_sys_unshare kernel/fork.c:2603 [inline]
 __se_sys_unshare kernel/fork.c:2601 [inline]
 __x64_sys_unshare+0x31/0x40 kernel/fork.c:2601
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459d87
Code: 00 00 00 b8 63 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 3d 8a fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 10 01 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 1d 8a fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffdc17a1cc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459d87
RDX: 0000000000000000 RSI: 00007ffdc17a1cd0 RDI: 0000000008000000
RBP: 0000000000930b28 R08: 0000000000000000 R09: 0000000000000018
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000010
R13: 0000000000412cc0 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace 0e8086936ae8338a ]---
RIP: 0010:mqueue_get_tree+0x147/0x2e0 ipc/mqueue.c:363
Code: 03 80 3c 02 00 0f 85 93 01 00 00 49 8d bd c8 00 00 00 4c 89 ab 98 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 60 01 00 00 4d 8b ad c8 00 00 00 be 04 00 00 00
RSP: 0018:ffff880146337928 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8801d789da80 RCX: ffffffff8160aca1
RDX: 0000000000000019 RSI: ffffffff833deb76 RDI: 00000000000000c8
RBP: ffff880146337948 R08: fffffbfff13555fd R09: fffffbfff13555fc
R10: fffffbfff13555fc R11: ffffffff89aaafe3 R12: ffff8801cf7c0bc0
R13: 0000000000000000 R14: ffff8801d789db18 R15: ffff8801d789db18
FS:  0000000001e81940(0000) GS:ffff8801dad00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000482e00 CR3: 00000001cdeb4000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400