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

From: Alexander V. Chernikov <melifaro_at_freebsd.org>
Date: Thu, 23 Jan 2020 09:16:24 +0000
21.01.2020, 20:10, "Nick Hibma" <nick_at_van-laarhoven.org>:
> That (with the return added, thanks Cy) worked like a charm.
Got committed in r357038.
Thank you for the report!
>
> Thanks for the fast response.
>
> Nick Hibma
> nick_at_van-laarhoven.org
>
> -- Open Source: We stand on the shoulders of giants.
>
>>  On 21 Jan 2020, at 18:38, 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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>>  <ipdivert.diff>
>
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Received on Thu Jan 23 2020 - 08:16:32 UTC

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