Re: panic: Assertion in_epoch(net_epoch_preempt) failed at ... src/sys/net/if.c:3694

From: Cy Schubert <Cy.Schubert_at_cschubert.com>
Date: Tue, 21 Jan 2020 11:40:33 -0800
On January 21, 2020 9:38:08 AM PST, "Alexander V. Chernikov" <melifaro_at_freebsd.org> wrote:
>21.01.2020, 17:25, "Nick Hibma" <nick_at_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
>>
>> Any pointers as to how to fix this?
>Could you please try to apply an attached patch and try again?
>>
>> Thanks in advance for any help.
>>
>> Nick Hibma
>> nick_at_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 = 0
>> time = 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 = 0xffc01230, esp =
>0xffc07fe8, ebp = 0xffbfeb68 ---
>> KDB: enter: panic
>>
>> 0x00fd1129 in doadump (textdump=0) at
>/usr/src/sys/kern/kern_shutdown.c:392
>> 392 savectx(&dumppcb);
>> (kgdb) quit
>> {e}nick_at_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_at_catwhisker.org>
>wrote:
>>>
>>>  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).
>>>
>>>  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).
>>>
>>>  Then I got a slightly different panic:
>>>
>>>  panic: Assertion in_epoch(net_epoch_preempt) failed at
>/usr/src/sys/net/if.c:356
>>>
>>>  Backtrace:
>>>
>>>  panic: Assertion in_epoch(net_epoch_preempt) failed at
>/usr/src/sys/net/if.c:356
>>>  cpuid = 0
>>>  time = 1570621553
>>>  KDB: stack backtrace:
>>>  db_trace_self_wrapper() at 0xffffffff8049ebab =
>db_trace_self_wrapper+0x2b/frame 0xfffffe1072956580
>>>  vpanic() at 0xffffffff80b978fd = vpanic+0x19d/frame
>0xfffffe10729565d0
>>>  panic() at 0xffffffff80b97693 = panic+0x43/frame 0xfffffe1072956630
>>>  if_ref() at 0xffffffff80ca1b10 = if_ref/frame 0xfffffe1072956650
>>>  sysctl_ifdata() at 0xffffffff80cb247d = sysctl_ifdata+0x4d/frame
>0xfffffe1072956760
>>>  sysctl_root_handler_locked() at 0xffffffff80ba714b =
>sysctl_root_handler_locked+0x7b/frame 0xfffffe10729567a0
>>>  sysctl_root() at 0xffffffff80ba64dc = sysctl_root+0x20c/frame
>0xfffffe1072956820
>>>  userland_sysctl() at 0xffffffff80ba6bab =
>userland_sysctl+0x17b/frame 0xfffffe10729568d0
>>>  sys___sysctl() at 0xffffffff80ba69ef = sys___sysctl+0x5f/frame
>0xfffffe1072956980
>>>  amd64_syscall() at 0xffffffff810480f4 = amd64_syscall+0x2d4/frame
>0xfffffe1072956ab0
>>>  fast_syscall_common() at 0xffffffff8101eaa0 =
>fast_syscall_common+0x101/frame 0xfffffe1072956ab0
>>>  --- syscall (202, FreeBSD ELF64, sys___sysctl), rip = 0x8014d4d2a,
>rsp = 0x7fffffffeaa8, rbp = 0x7fffffffeae0 ---
>>>  KDB: enter: panic
>>>
>>>>  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/
>>>
>>>  This one is at
>http://www.catwhisker.org/~david/FreeBSD/head/r353336
>>>
>>>  As before, the (headless) build machine had no issues that I could
>see.
>>>
>>>  Peace,
>>>  david
>>>  --
>>>  David H. Wolfskill david_at_catwhisker.org
>>>  I am amazed that anyone would condone what Trunp has publicly
>admitted he did.
>>>
>>>  See http://www.catwhisker.org/~david/publickey.gpg for my public
>key.
>>
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Looks like the patch is missing a return(ret).


-- 
Pardon the typos and autocorrect, small keyboard in use. 
Cy Schubert <Cy.Schubert_at_cschubert.com>
FreeBSD UNIX: <cy_at_FreeBSD.org> Web: https://www.FreeBSD.org

The need of the many outweighs the greed of the few.

Sent from my Android device with K-9 Mail. Please excuse my brevity.
Received on Tue Jan 21 2020 - 18:41:06 UTC

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