Date: Tue, 21 Jan 2020 18:24:39 +0100 From: Nick Hibma <nick@van-laarhoven.org> To: current@freebsd.org Subject: Re: panic: Assertion in_epoch(net_epoch_preempt) failed at ... src/sys/net/if.c:3694 Message-ID: <83DFEF06-AB56-4F5C-A11C-9888C85A34F5@van-laarhoven.org> In-Reply-To: <20191009120451.GK1263@albert.catwhisker.org> References: <20191008121519.GS1263@albert.catwhisker.org> <20191009120451.GK1263@albert.catwhisker.org>
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When using a trivial program to read from the divert socket and post =
back the machine panics instantly when a packet is sent to userland and =
back again (incoming packet for the interface, so ifname is set). This =
is current from today with no changes
Any pointers as to how to fix this?
Thanks in advance for any help.
Nick Hibma
nick@van-laarhoven.org
-- Open Source: We stand on the shoulders of giants.
Unread portion of the kernel message buffer:
panic: Assertion in_epoch(net_epoch_preempt) failed at =
/usr/src/sys/netinet/in.c:968
cpuid =3D 0
time =3D 1579626632
KDB: stack backtrace:
db_trace_self_wrapper(3836393a,1a9000a,0,1fdc088c,bd5320,...) at =
db_trace_self_wrapper+0x2a/frame 0x1fdc0860
kdb_backtrace(2,1e03ebc,1fdc08e8,14683a4,20b72500,...) at =
kdb_backtrace+0x2e/frame 0x1fdc08c0
vpanic(1461278,1fdc0904,1fdc0904,1fdc0918,11355ac,...) at =
vpanic+0x11f/frame 0x1fdc08e4
panic(1461278,1512573,154b440,3c8,20b72500,...) at panic+0x14/frame =
0x1fdc08f8
in_broadcast(f02000a,94df400,20b72594,1dc0ae8,2001be24,...) at =
in_broadcast+0x8c/frame 0x1fdc0918
div_send(2001bcc0,0,20b72500,9082e10,0,177f1a80) at div_send+0x1bd/frame =
0x1fdc0958
sosend_generic(2001bcc0,9082e10,1fdc0a18,0,0,0,177f1a80) at =
sosend_generic+0x3c5/frame 0x1fdc09b4
sosend(2001bcc0,9082e10,1fdc0a18,0,0,...) at sosend+0x50/frame =
0x1fdc09e4
kern_sendit(177f1a80,3,1fdc0aa0,0,0,0) at kern_sendit+0x1b4/frame =
0x1fdc0a50
sendit(1fdc0aa0,0) at sendit+0x196/frame 0x1fdc0a88
sys_sendto(177f1a80,177f1d0c) at sys_sendto+0x50/frame 0x1fdc0ac8
syscall(1fdc0ba8,3b,3b,3b,54,...) at syscall+0x2db/frame 0x1fdc0b9c
Xint0x80_syscall() at 0xffc033c9/frame 0x1fdc0b9c
--- syscall (133, FreeBSD ELF32, sys_sendto), eip =3D 0xffc01230, esp =3D =
0xffc07fe8, ebp =3D 0xffbfeb68 ---
KDB: enter: panic
0x00fd1129 in doadump (textdump=3D0) at =
/usr/src/sys/kern/kern_shutdown.c:392
392 savectx(&dumppcb);
(kgdb) quit
{e}nick@fimkjecurrent:/home/nick % svn info /usr/src
Path: /usr/src
Working Copy Root Path: /usr/src
URL: svn+ssh://repo.freebsd.org/base/head
Relative URL: ^/head
Repository Root: svn+ssh://repo.freebsd.org/base
Repository UUID: ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Revision: 356907
Node Kind: directory
Schedule: normal
Last Changed Author: jhibbits
Last Changed Rev: 356904
Last Changed Date: 2020-01-20 05:01:35 +0100 (Mon, 20 Jan 2020)
> On 9 Oct 2019, at 14:04, David Wolfskill <david@catwhisker.org> wrote:
>=20
> On Tue, Oct 08, 2019 at 05:15:19AM -0700, David Wolfskill wrote:
>> This was on my laptop (build machine, which was updated in parallel,
>> but uses a different NIC, had no issues) after a src update from
>> r353176 to r353298; laptop's NIC is wlan(4) (which is iwn(4), in
>> this case).
>=20
> After restoring the /boot/*.old set, I was able to reboot & update =
from
> r353298 to r353336. The subsequent reboot seemed OK ... until the
> keyboard & mouse were enabled (under X11; I use xdm on the laptop).
>=20
> Then I got a slightly different panic:
>=20
> panic: Assertion in_epoch(net_epoch_preempt) failed at =
/usr/src/sys/net/if.c:356
>=20
> Backtrace:
>=20
> panic: Assertion in_epoch(net_epoch_preempt) failed at =
/usr/src/sys/net/if.c:356
> cpuid =3D 0
> time =3D 1570621553
> KDB: stack backtrace:
> db_trace_self_wrapper() at 0xffffffff8049ebab =3D =
db_trace_self_wrapper+0x2b/frame 0xfffffe1072956580
> vpanic() at 0xffffffff80b978fd =3D vpanic+0x19d/frame =
0xfffffe10729565d0
> panic() at 0xffffffff80b97693 =3D panic+0x43/frame 0xfffffe1072956630
> if_ref() at 0xffffffff80ca1b10 =3D if_ref/frame 0xfffffe1072956650
> sysctl_ifdata() at 0xffffffff80cb247d =3D sysctl_ifdata+0x4d/frame =
0xfffffe1072956760
> sysctl_root_handler_locked() at 0xffffffff80ba714b =3D =
sysctl_root_handler_locked+0x7b/frame 0xfffffe10729567a0
> sysctl_root() at 0xffffffff80ba64dc =3D sysctl_root+0x20c/frame =
0xfffffe1072956820
> userland_sysctl() at 0xffffffff80ba6bab =3D =
userland_sysctl+0x17b/frame 0xfffffe10729568d0
> sys___sysctl() at 0xffffffff80ba69ef =3D sys___sysctl+0x5f/frame =
0xfffffe1072956980
> amd64_syscall() at 0xffffffff810480f4 =3D amd64_syscall+0x2d4/frame =
0xfffffe1072956ab0
> fast_syscall_common() at 0xffffffff8101eaa0 =3D =
fast_syscall_common+0x101/frame 0xfffffe1072956ab0
> --- syscall (202, FreeBSD ELF64, sys___sysctl), rip =3D 0x8014d4d2a, =
rsp =3D 0x7fffffffeaa8, rbp =3D 0x7fffffffeae0 ---
> KDB: enter: panic
>=20
>> The ddb "dump" command recorded a dump, which I managed to capture; =
the
>> information may be found at
>> http://www.catwhisker.org/~david/FreeBSD/head/r353298/
>=20
> This one is at http://www.catwhisker.org/~david/FreeBSD/head/r353336
>=20
> As before, the (headless) build machine had no issues that I could =
see.
>=20
> Peace,
> david
> --=20
> David H. Wolfskill david@catwhisker.org
> I am amazed that anyone would condone what Trunp has publicly admitted =
he did.
>=20
> See http://www.catwhisker.org/~david/publickey.gpg for my public key.
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