[Bug 248046] if_bridge(4): Panic when creating an interface: malloc(M_WAITOK) in epoch context

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=248046

--- Comment #17 from dmilith <dmilith at me.com> ---
(In reply to Kristof Provost from comment #16)

I did rebuild again, full command that caused KP:

ifconfig bridge0 create; ifconfig tap0 create; ifconfig tap1 create; ifconfig
bridge0 addm tap0 up; ifconfig bridge0 addm tap1 up; ifconfig bridge0 addm em0
up

NOTE: em0 is my main network card, virtualized under vmware fusion 7.1.3 pro

It's production build, so dmesg log is limited:

[44] KDB: stack backtrace:
[44] #0 0xffffffff8098a9d5 at kdb_backtrace+0x65
[44] #1 0xffffffff80947790 at vpanic+0x180
[44] #2 0xffffffff809475a3 at panic+0x43
[44] #3 0xffffffff80951fdd at _sleep+0x3dd
[44] #4 0xffffffff80952331 at pause_sbt+0xf1
[44] #5 0xffffffff804fa177 at e1000_reset_hw_82540+0x177
[44] #6 0xffffffff804f114b at em_if_stop+0x1b
[44] #7 0xffffffff80a43a71 at iflib_stop+0xc1
[44] #8 0xffffffff80a50d6c at iflib_if_ioctl+0x39c
[44] #9 0xffffffff82f2c5c5 at bridge_mutecaps+0x145
[44] #10 0xffffffff82f28467 at bridge_ioctl_add+0x467
[44] #11 0xffffffff82f2a37b at bridge_ioctl+0x32b
[44] #12 0xffffffff80a35ce1 at ifioctl+0x701
[44] #13 0xffffffff809a9895 at kern_ioctl+0x2d5
[44] #14 0xffffffff809a9517 at sys_ioctl+0x127
[44] #15 0xffffffff80d71b84 at amd64_syscall+0x2a4
[44] #16 0xffffffff80d4b1ae at fast_syscall_common+0xf8
[44] Uptime: 44s

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