[Bug 273418] [panic] Repeating kernel panic on open(/dev/console)

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=273418

--- Comment #8 from Eugene Grosbein <eugen@freebsd.org> ---
(In reply to Konstantin Belousov from comment #7)

> Do you have any third-party modules loaded?

No third-party, but lots of ones from base system:

Id Refs Address                Size Name
 1  109 0xffffffff80200000  2165030 kernel
 2    1 0xffffffff82366000     3000 alias_nbt.ko
 3    9 0xffffffff82369000    175c8 libalias.ko
 4    1 0xffffffff82382000     2b10 alias_dummy.ko
 5    1 0xffffffff82385000   6e5a88 zfs.ko
 6    1 0xffffffff82a6b000     2fe8 alias_irc.ko
 7    1 0xffffffff82a6e000     3130 alias_pptp.ko
 8    1 0xffffffff82a72000     6d70 ng_mppc.ko
 9    2 0xffffffff82a79000     27b8 rc4.ko
10   12 0xffffffff82a7c000    18de8 netgraph.ko
11    1 0xffffffff82a95000    22458 geom_mirror.ko
12    1 0xffffffff82ab8000     7d38 ipfw_nat.ko
13    1 0xffffffff82ac0000     3498 alias_smedia.ko
14    1 0xffffffff82ac4000     2c08 alias_skinny.ko
15    1 0xffffffff82ac7000     3598 alias_ftp.ko
16    1 0xffffffff82d21000     3530 fdescfs.ko
17    1 0xffffffff82d25000    105c0 ipsec.ko
18    1 0xffffffff82d36000     4250 ichsmb.ko
19    1 0xffffffff82d3b000     2180 smbus.ko
20    1 0xffffffff82d3e000     8db8 ioat.ko
21    1 0xffffffff82d47000     3340 uhid.ko
22    1 0xffffffff82d4b000     3380 usbhid.ko
23    1 0xffffffff82d4f000     32b0 hidbus.ko
24    1 0xffffffff82d53000     3320 wmt.ko
25    1 0xffffffff82d57000     4350 ums.ko
26    1 0xffffffff82d5c000    12520 dummynet.ko
27    1 0xffffffff82d6f000     4700 nullfs.ko
28    1 0xffffffff82d74000     2a08 mac_ntpd.ko
29    1 0xffffffff82d77000     31c8 ng_ether.ko
30    1 0xffffffff82d7b000     3148 ng_ipacct.ko
31    1 0xffffffff82d7f000     39c0 ng_socket.ko
32    1 0xffffffff82d83000     2138 ng_tee.ko
33    1 0xffffffff82d86000     2398 ng_iface.ko
34    1 0xffffffff82d89000     61e8 ng_ppp.ko
35    1 0xffffffff82d90000     51e8 ng_l2tp.ko
36    1 0xffffffff82d96000     31e8 ng_ksocket.ko
37    1 0xffffffff82d9a000     2138 ng_tcpmss.ko
38    1 0xffffffff82d9d000     3138 ng_vjc.ko

Custom kernel config is GENERIC plus debugging options cited above plus:

include GENERIC
ident           Base13
options         IPDIVERT
options         IPFIREWALL
options         IPFIREWALL_VERBOSE
options         IPFIREWALL_VERBOSE_LIMIT=100
options         IPFIREWALL_DEFAULT_TO_ACCEPT
device          enc

> Are there any changes in src comparing to stock git?

Only one you committed against another panic:
https://cgit.freebsd.org/src/commit/?id=7b335e9f690e77841e3eb7dbf3403429b10fe222

It was applied as single patch to the stable/13 tree updated to
https://cgit.freebsd.org/src/commit/?h=stable/13&id=8711fd210 because I
suspected that problem here, too. I was wrong.

> Were there unmounts of devfs mounts?

No. All crashes occured just after midnight and all backtraces point to syslogd
opening /dev/console, so I'm confident that panic is triggered by syslogd
closing/reopening /dev/console after receiving SIGHUP from newsyslogd.

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