Re: 2.6.11 on AMD64 traps

[Andre Tomt <andre@tomt.net>]

[just adding netdev to CC, from LKML]

Michal Vanco wrote:
> Hello,
> 
> I see this problem running 2.6.11 on dual AMD64:
> 
> Running quagga routing daemon (ospf+bgp) and issuing "netstat -rn |wc -l" command
> while quagga tries to load more than 154000 routes from its bgp neighbours causes this trap:
> 
> Unable to handle kernel paging request at 00000000007f5c60 RIP:
> <ffffffff8041be35>{fib_get_next+181}
> PGD 3a112067 PUD 3a115067 PMD 0
> Oops: 0000 [1] SMP
> CPU 1
> Modules linked in:
> Pid: 2537, comm: netstat Not tainted 2.6.11-mv
> RIP: 0010:[<ffffffff8041be35>] <ffffffff8041be35>{fib_get_next+181}
> RSP: 0018:ffff81003a13fe90  EFLAGS: 00010206
> RAX: ffff81003a74c000 RBX: 0000000000000000 RCX: ffff81003a13ff50
> RDX: 00000000007f5c60 RSI: 0000000000000000 RDI: ffff81003a004d00
> RBP: ffff81003a13fed8 R08: ffff81003f3ff7c0 R09: 0000000000000800
> R10: 00007fffffffefe0 R11: 0000000000000246 R12: ffff810002231480
> R13: 00002aaaaab08000 R14: 0000000000000400 R15: ffff8100022314a8
> FS:  00002aaaaae00620(0000) GS:ffffffff806195c0(0000) knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> CR2: 00000000007f5c60 CR3: 000000003a12e000 CR4: 00000000000006e0
> Process netstat (pid: 2537, threadinfo ffff81003a13e000, task ffff81003a66a760)
> Stack: ffffffff8041bf0f ffff810002231480 ffff81003a67ac80 0000000000000000
> ffffffff8019576b 0000000000000000 ffff81003a13ff50 00002aaaaab08000
> 00000000000006f7 00000000000006f8
> Call Trace:<ffffffff8041bf0f>{fib_seq_start+63} <ffffffff8019576b>{seq_read+219}
> <ffffffff8017497f>{vfs_read+191} <ffffffff80174c53>{sys_read+83}
> <ffffffff8010d1ba>{system_call+126}
> 
> Code: 48 8b 0a 0f 18 09 48 8b 72 10 48 8b 06 0f 18 08 48 8d 42 10
> RIP <ffffffff8041be35>{fib_get_next+181} RSP <ffff81003a13fe90>
> CR2: 00000000007f5c60
> 
> I saw the same issue on 2.6.10 before. I'm not a kernel hacker but it sounds like
> locking problem. But may be I'm totally wrong in this.
> 
> michal