[Bug 239351] [panic] spin lock held too long under heavy load (net/wireguard affected)

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=239351

--- Comment #16 from Mark Johnston <markj at FreeBSD.org> ---
(In reply to Konstantin Belousov from comment #15)
See comment 12: it was on r350275+r350310.  The stack was:

panic: Assertion error_ == 0 failed at /freebsd/src/sys/vm/vm_map.c:553
cpuid = 4
time = 1564016615
KDB: stack backtrace:
db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame 0xfffffe00a9081780
vpanic() at vpanic+0x19d/frame 0xfffffe00a90817d0
panic() at panic+0x43/frame 0xfffffe00a9081830
vm_map_entry_set_vnode_text() at vm_map_entry_set_vnode_text+0x1de/frame
0xfffffe00a9081870
vm_map_process_deferred() at vm_map_process_deferred+0x70/frame
0xfffffe00a9081890
vm_map_remove() at vm_map_remove+0xc6/frame 0xfffffe00a90818c0
vmspace_exit() at vmspace_exit+0xd3/frame 0xfffffe00a9081900
exit1() at exit1+0x5ad/frame 0xfffffe00a9081970
sys_sys_exit() at sys_sys_exit+0xd/frame 0xfffffe00a9081980
amd64_syscall() at amd64_syscall+0x2bb/frame 0xfffffe00a9081ab0
fast_syscall_common() at fast_syscall_common+0x101/frame 0xfffffe00a9081ab0
--- syscall (1, FreeBSD ELF64, sys_sys_exit), rip = 0x80076092a, rsp =
0x7fffffffcee8, rbp = 0x7fffffffcf00 ---

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