Re: CURRENT (r316844): Fatal trap 12: page fault while in kernel mode (syslogd)

Am Sat, 15 Apr 2017 12:33:34 +0300
Konstantin Belousov <kostikbel_at_gmail.com> schrieb:

> On Sat, Apr 15, 2017 at 11:18:41AM +0200, O. Hartmann wrote:
> > Am Fri, 14 Apr 2017 20:18:57 +0300
> > Konstantin Belousov <kostikbel_at_gmail.com> schrieb:
> >   
> > > On Fri, Apr 14, 2017 at 06:58:27PM +0200, O. Hartmann wrote:  
> > > > Fatal trap 12: page fault while in kernel mode
> > > > cpuid = 2; apic id = 02
> > > > fault virtual address   = 0xfffff8001282fb00
> > > > fault code              = supervisor read instruction, protection violation    
> > >   
> > > > ??() at 0xfffff8001282fb00
> > > > bpf_mtap() at bpf_mtap+0x1ab/frame 0xfffffe012d2aefb0
> > > > iflib_txq_drain() at iflib_txq_drain+0x1383/frame 0xfffffe012d2af130
> > > > drain_ring_lockless() at drain_ring_lockless+0xc0/frame 0xfffffe012d2af190
> > > > ifmp_ring_enqueue() at ifmp_ring_enqueue+0x32e/frame 0xfffffe012d2af200
> > > > iflib_if_transmit() at iflib_if_transmit+0xb0/frame 0xfffffe012d2af240
> > > > ether_output() at ether_output+0x730/frame 0xfffffe012d2af2e0
> > > > arprequest() at arprequest+0x426/frame 0xfffffe012d2af3e0
> > > > arpresolve_full() at arpresolve_full+0x3d1/frame 0xfffffe012d2af460
> > > > arpresolve() at arpresolve+0x10c/frame 0xfffffe012d2af4d0
> > > > ether_output() at ether_output+0x4e1/frame 0xfffffe012d2af570
> > > > ip_output() at ip_output+0x14e6/frame 0xfffffe012d2af6b0
> > > > udp_send() at udp_send+0xab1/frame 0xfffffe012d2af780
> > > > sosend_dgram() at sosend_dgram+0x3e4/frame 0xfffffe012d2af7f0
> > > > kern_sendit() at kern_sendit+0x229/frame 0xfffffe012d2af890
> > > > sendit() at sendit+0x1a7/frame 0xfffffe012d2af8e0
> > > > sys_sendto() at sys_sendto+0x4d/frame 0xfffffe012d2af930
> > > > amd64_syscall() at amd64_syscall+0x4c2/frame 0xfffffe012d2afab0
> > > > Xfast_syscall() at Xfast_syscall+0xfb/frame 0xfffffe012d2afab0
> > > > syscall (133, FreeBSD ELF64, sys_sendto), rip = 0x800b8a5fa, rsp = 0x7fffffffd6b8,
> > > > rbp = 0x7fffffffdcc0 ---    
> > > 
> > > You probably have BPF_JITTER option in your kernel config.  Either set
> > > net.bpf_jitter.enable to 0 for now, or remove the option.
> > > 
> > > It is due to r316767. The issue is known and a solution is being discussed.  
> > 
> > simply setting "net.bpf_jitter.enable=0" in /boot/loader.conf.local doesn't help, the
> > Trap 12 still occurs.  
> 
> It is sysctl, not tunable.

Correct, I didn't/couldn't think that far. Having a setting in /etc/sysctl.conf
accordingly, booting the kernel doesn't reveal the Trap 12 anymore.

Thanks.
Oliver


-- 
O. Hartmann

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