Date: Tue, 21 Jan 2020 21:09:25 +0100 From: Nick Hibma <nick@van-laarhoven.org> To: "Alexander V. Chernikov" <melifaro@freebsd.org> Cc: "current@freebsd.org" <current@freebsd.org>, Cy.Schubert@cschubert.com Subject: Re: panic: Assertion in_epoch(net_epoch_preempt) failed at ... src/sys/net/if.c:3694 Message-ID: <EB09DB96-1717-4560-AFC5-52C8AEB5CC5B@van-laarhoven.org> In-Reply-To: <833361579628288@myt4-2943a877c094.qloud-c.yandex.net> References: <20191008121519.GS1263@albert.catwhisker.org> <20191009120451.GK1263@albert.catwhisker.org> <83DFEF06-AB56-4F5C-A11C-9888C85A34F5@van-laarhoven.org> <833361579628288@myt4-2943a877c094.qloud-c.yandex.net>
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That (with the return added, thanks Cy) worked like a charm.
Thanks for the fast response.
Nick Hibma
nick@van-laarhoven.org
-- Open Source: We stand on the shoulders of giants.
> On 21 Jan 2020, at 18:38, Alexander V. Chernikov =
<melifaro@freebsd.org> wrote:
>=20
> 21.01.2020, 17:25, "Nick Hibma" <nick@van-laarhoven.org>:
>> 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
>>=20
>> Any pointers as to how to fix this?
> Could you please try to apply an attached patch and try again?
>>=20
>> Thanks in advance for any help.
>>=20
>> Nick Hibma
>> nick@van-laarhoven.org
>>=20
>> -- Open Source: We stand on the shoulders of giants.
>>=20
>> 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
>>=20
>> 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)
>>=20
>>> 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
>>> --
>>> 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.
>>=20
>> _______________________________________________
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>> https://lists.freebsd.org/mailman/listinfo/freebsd-current
>> To unsubscribe, send any mail to =
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> <ipdivert.diff>
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