netdev - Re: general protection fault in dst_destroy()

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Date:   Sun, 26 Nov 2017 10:43:58 +0000
From:   "Anders K. Pedersen | Cohaesio" <akp@...aesio.com>
To:     "idosch@...sch.org" <idosch@...sch.org>
CC:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "edumazet@...gle.com" <edumazet@...gle.com>
Subject: Re: general protection fault in dst_destroy() - 4.13.9

On man, 2017-11-20 at 17:13 +0200, Ido Schimmel wrote:
> On Sun, Nov 19, 2017 at 12:45:41PM +0000, Anders K. Pedersen |
> Cohaesio wrote:
> > Hello,
> > 
> > A few days ago, one of our routers (running Linux 4.13.9) crashed
> > due
> > to a general protection fault in dst_destroy(). At the time, it had
> > run
> > for several weeks without any problems, but then crashed three
> > times in
> > a row within a few minutes - all due to a general protection fault
> > at
> > dst_destroy()+0x35. Since then, it has run for several days without
> > any
> > further problems, so I suspect that this was triggered by a traffic
> > pattern in the routed packets, but I don't have a way to reproduce
> > it.
> > 
> > Disassembly shows that this is in the inlined dev_put(), which does
> > this_cpu_dec(*dev->pcpu_refcnt). As far as I can tell there haven't
> > been any fixes in this area since 4.13, and a Google search didn't
> > find
> > anything recent, so I'm guessing this is not a known problem.
> > 
> > I have included the kernel output via serial console below as well
> > as
> > gdb and objdump information. Please let me know, if I can provide
> > any
> > additional information.
> > 
> > 
> > [2024260.461401] general protection fault: 0000 [#1] SMP
> > [2024260.467193] Modules linked in:
> > [2024260.470897] CPU: 15 PID: 0 Comm: swapper/15 Tainted:
> > G        W       4.13.9 #2
> > [2024260.479488] Hardware name: Dell Inc. PowerEdge R730/0H21J3,
> > BIOS 2.5.5 08/16/2017
> > [2024260.488279] task: ffff88085b625cc0 task.stack:
> > ffffc900000e4000
> > [2024260.495277] RIP: 0010:dst_destroy+0x35/0xa0
> > [2024260.500277] RSP: 0018:ffff88085f5c3f08 EFLAGS: 00010286
> > [2024260.506474] RAX: ffff88085ac0e880 RBX: ffff88082cf9fb00 RCX:
> > 0000000000000020
> > [2024260.514868] RDX: ffff88082cf9fbc0 RSI: ffffffffffffffff RDI:
> > ffffffff816786c0
> > [2024260.523258] RBP: 0000000000000000 R08: ffffffffffffff00 R09:
> > 0000000000000000
> > [2024260.531649] R10: 0000000000000000 R11: 0000000000000000 R12:
> > ffff88085f5da678
> > [2024260.540040] R13: 000000000000000a R14: ffff88085b625cc0 R15:
> > ffff88085b625cc0
> > [2024260.548431] FS:  0000000000000000(0000)
> > GS:ffff88085f5c0000(0000) knlGS:0000000000000000
> > [2024260.557924] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> > [2024260.564719] CR2: 00007fc800e48e88 CR3: 0000000001809000 CR4:
> > 00000000001406e0
> > [2024260.573112] Call Trace:
> > [2024260.576113]  <IRQ>
> > [2024260.578618]  ? rcu_process_callbacks+0x18f/0x460
> > [2024260.584126]  ? rebalance_domains+0xe2/0x290
> > [2024260.589128]  ? __do_softirq+0x100/0x292
> > [2024260.593727]  ? irq_exit+0x92/0xa0
> > [2024260.597729]  ? smp_apic_timer_interrupt+0x39/0x50
> > [2024260.603328]  ? apic_timer_interrupt+0x7c/0x90
> > [2024260.608528]  </IRQ>
> > [2024260.611134]  ? cpuidle_enter_state+0x14c/0x2b0
> > [2024260.616432]  ? cpuidle_enter_state+0x128/0x2b0
> > [2024260.621731]  ? do_idle+0xf9/0x190
> > [2024260.625733]  ? cpu_startup_entry+0x5f/0x70
> > [2024260.630636]  ? start_secondary+0x12a/0x130
> > [2024260.635536]  ? secondary_startup_64+0x9f/0x9f
> > [2024260.640731] Code: f6 47 60 08 48 8b 6f 18 74 62 48 8b 43 20 48
> > 8b 40 30 48 85 c0 74 05 48
> > 89 df ff d0 48 8b 03 48 85 c0 74 0a 48 8b 80 e0 03 00 00 <65> ff 08
> > f6 43 60 80 74 26 48 8d bb
> > e0 00 00 00 e8 e6 7f 01 00
> > [2024260.662626] RIP: dst_destroy+0x35/0xa0 RSP: ffff88085f5c3f08
> > [2024260.669333] ---[ end trace 3c1827251806827c ]---
> > [2024260.724173] Kernel panic - not syncing: Fatal exception in
> > interrupt
> > [2024261.102792] Kernel Offset: disabled
> > [2024261.156022] Rebooting in 60 seconds..
> > [2024321.167958] ACPI MEMORY or I/O RESET_REG.
> 
> This looks very similar to a bug Eric already fixed here:
> https://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/co
> mmit/?id=222d7dbd258dad4cd5241c43ef818141fad5a87a
> 
> I don't see it in v4.13.9 which might explain why you're still
> hitting
> it. Can you please try to reproduce with mentioned patch?

Yes, it looks like it could be related. I see that it is included in
v4.14, so we'll update to that and see if it comes back.

Thanks,
Anders