WARNING in kcm_exit

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	WARNING in kcm_exit_net (2) net	-1				6	2766d	2793d	0/29	closed as invalid on 2018/04/08 19:37
upstream	WARNING in kcm_exit_net (3) net	-1	syz			5	2611d	2611d	5/29	fixed on 2018/06/07 13:52

Buffer I/O error on dev loop0, logical block 7, async page read ------------[ cut here ]------------ WARNING: CPU: 1 PID: 5 at net/kcm/kcmsock.c:2014 kcm_exit_net+0x317/0x360 net/kcm/kcmsock.c:2014 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 5 Comm: kworker/u4:0 Not tainted 4.14.0-rc2+ #106 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: netns cleanup_net Call Trace: __dump_stack lib/dump_stack.c:16 [inline] dump_stack+0x194/0x257 lib/dump_stack.c:52 panic+0x1e4/0x417 kernel/panic.c:181 __warn+0x1c4/0x1d9 kernel/panic.c:542 report_bug+0x211/0x2d0 lib/bug.c:183 fixup_bug+0x40/0x90 arch/x86/kernel/traps.c:178 do_trap_no_signal arch/x86/kernel/traps.c:212 [inline] do_trap+0x260/0x390 arch/x86/kernel/traps.c:261 do_error_trap+0x120/0x390 arch/x86/kernel/traps.c:298 do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:311 invalid_op+0x18/0x20 arch/x86/entry/entry_64.S:905 RIP: 0010:kcm_exit_net+0x317/0x360 net/kcm/kcmsock.c:2014 RSP: 0018:ffff8801d9f2f198 EFLAGS: 00010297 RAX: ffff8801d9f20140 RBX: 1ffff1003b3e5e33 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffed003b3e5e28 RBP: ffff8801d9f2f260 R08: 0000000000000000 R09: 1ffff1003b3e5e0c R10: ffff8801d9f20140 R11: 0000000000000003 R12: 1ffff1003b3e5e37 R13: ffff8801d9f2f238 R14: ffff8801c1a5e620 R15: ffff8801c496a380 ops_exit_list.isra.6+0xae/0x150 net/core/net_namespace.c:142 cleanup_net+0x5c7/0xb60 net/core/net_namespace.c:483 process_one_work+0xbfa/0x1bd0 kernel/workqueue.c:2119 worker_thread+0x223/0x1860 kernel/workqueue.c:2253 kthread+0x39c/0x470 kernel/kthread.c:231 ret_from_fork+0x2a/0x40 arch/x86/entry/entry_64.S:431 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 86400 seconds..