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Re: kern/51467 detaching USB network interface panics

The following reply was made to PR kern/51467; it has been noted by GNATS.

From: Michael van Elst <>
Subject: Re: kern/51467 detaching USB network interface panics
Date: Sat, 22 Oct 2016 18:01:06 +0200

 The problem seems to be unrelated to USB. With -current 7.99.40 I just
 got the following panic during shutdown:
 fatal protection fault in supervisor mode
 trap type 4 code 0 rip ffffffff8042d087 cs 8 rflags 10282 cr2 ffff800090099000 ilevel 6 rsp fffffe810ec96960
 curlwp 0xfffffe8216546220 pid 1759.1 lowest kstack 0xfffffe810ec932c0
 kernel: protection fault trap, code=0
 Stopped in pid 1759.1 (halt) at
 :       movq    10(%rbx),%rdi
 db{0}> bt
 find_pfxlist_reachable_router.isra.6() at
 pfxlist_onlink_check() at netbsd:pfxlist_onlink_check+0x132
 nd6_purge() at netbsd:nd6_purge+0x103
 in6_ifdetach() at netbsd:in6_ifdetach+0x1b
 udp6_purgeif_wrapper() at netbsd:udp6_purgeif_wrapper+0x39
 if_detach() at netbsd:if_detach+0x264
 bge_detach() at netbsd:bge_detach+0x6e
 config_detach() at netbsd:config_detach+0xf8
 config_detach_all() at netbsd:config_detach_all+0x97
 cpu_reboot() at netbsd:cpu_reboot+0x174
 sys_reboot() at netbsd:sys_reboot+0x75
 syscall() at netbsd:syscall+0x164
 --- syscall (number 208) ---
                                 Michael van Elst
                                 "A potential Snark may lurk in every tree."

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