WARNING: CPU: 1 PID: 64 at drivers/infiniband/core/cma.c:4674 cma_exit_net+0x327/0x390 drivers/infiniband/core/cma.c:4674 Kernel panic - not syncing: panic_on_warn set ... CPU: 1 PID: 64 Comm: kworker/u4:3 Not tainted 5.1.0-rc3-next-20190402 #16 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:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 panic+0x2cb/0x65c kernel/panic.c:214 __warn.cold+0x20/0x45 kernel/panic.c:571 report_bug+0x263/0x2b0 lib/bug.c:186 fixup_bug arch/x86/kernel/traps.c:179 [inline] fixup_bug arch/x86/kernel/traps.c:174 [inline] do_error_trap+0x11b/0x200 arch/x86/kernel/traps.c:272 do_invalid_op+0x37/0x50 arch/x86/kernel/traps.c:291 invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:973 RIP: 0010:cma_exit_net+0x327/0x390 drivers/infiniband/core/cma.c:4674 Code: 00 48 c7 c7 80 54 ea 87 c6 05 9c 00 4a 04 01 e8 2a 3e 46 fc e9 c8 fd ff ff e8 85 dd 5e fc 0f 0b e9 d7 fe ff ff e8 79 dd 5e fc <0f> 0b e8 72 dd 5e fc 48 8d 65 e8 5b 41 5c 41 5d 5d c3 e8 62 dd 5e RSP: 0018:ffff8880a9a0fbf0 EFLAGS: 00010293 RAX: ffff8880a99fc1c0 RBX: ffff88809f0580c0 RCX: 1ffff1101533f946 RDX: 0000000000000000 RSI: ffffffff8511a367 RDI: ffff88809f0581d8 RBP: ffff8880a9a0fc08 R08: ffff8880a99fc1c0 R09: 0000000000000004 R10: ffffed1015d25bcf R11: ffff8880ae92de7b R12: 0000000000000001 R13: ffff888091707680 R14: ffffffff891e3218 R15: dffffc0000000000 ops_exit_list.isra.0+0xb0/0x160 net/core/net_namespace.c:153 cleanup_net+0x3fb/0x960 net/core/net_namespace.c:552 process_one_work+0x98e/0x1790 kernel/workqueue.c:2270 worker_thread+0x98/0xe40 kernel/workqueue.c:2416 kthread+0x357/0x430 kernel/kthread.c:254 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 Kernel Offset: disabled Rebooting in 86400 seconds..