New LOR ?

[Poul-Henning Kamp]

I don't recall seeing this one before:

FreeBSD critter.freebsd.dk 11.0-CURRENT FreeBSD 11.0-CURRENT #31 r293468: Sat Jan  9 11:50:09 UTC 2016     root at critter.freebsd.dk:/freebsd/obj/freebsd/svn_src/head/sys/GENERIC  amd64

+taskqueue_drain with the following non-sleepable locks held:
+exclusive sleep mutex bpf global lock (bpf global lock) r = 0 (0xffffffff81c53
fe8) locked @ /freebsd/svn_src/head/sys/net/bpf.c:772
+stack backtrace:
+#0 0xffffffff80a79ee0 at witness_debugger+0x70
+#1 0xffffffff80a7b1f7 at witness_warn+0x3d7
+#2 0xffffffff80a6daeb at taskqueue_drain+0x3b
+#3 0xffffffff80b4bb0b at ieee80211_waitfor_parent+0x3b
+#4 0xffffffff80b32d57 at ieee80211_ioctl+0x2f7
+#5 0xffffffff80afe025 at if_setflag+0xd5
+#6 0xffffffff80afdefc at ifpromisc+0x2c
+#7 0xffffffff80af41e8 at bpf_detachd_locked+0x1e8
+#8 0xffffffff80af6cfe at bpf_dtor+0x8e
+#9 0xffffffff808f7312 at devfs_destroy_cdevpriv+0x82
+#10 0xffffffff808faa85 at devfs_close_f+0x65
+#11 0xffffffff809d0e6a at _fdrop+0x1a
+#12 0xffffffff809d3fb1 at closef+0x1e1
+#13 0xffffffff809d3afd at fdescfree_fds+0x9d
+#14 0xffffffff809d361c at fdescfree+0x46c
+#15 0xffffffff809e1676 at exit1+0x4e6
+#16 0xffffffff809e118d at sys_sys_exit+0xd
+#17 0xffffffff80e6b13b at amd64_syscall+0x2db



-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence.