Re: 2.6.21-git8+ BUG: NMI Watchdog detected LOCKUP on CPU1

[Chuck Ebbert <cebbert@redhat.com>]

Michal Piotrowski wrote:
> Hi,
> 
> / filesystem was full
> 
> [39525.460000] BUG: NMI Watchdog detected LOCKUP on CPU1, eip 08056990, registers:
> [39525.468000] Modules linked in: loop ipt_MASQUERADE iptable_nat nf_nat autofs4 af_packet nf_conntrack_netbios_ns ipt_REJECT nf_conntrack_ipv4 xt_state nf_conntrack nfnetlink iptable_filter ip_tables ip6t_REJECT xt_tcpudp ip6table_filter ip6_tables x_tables ipv6 binfmt_misc thermal processor fan container nvram snd_intel8x0 snd_ac97_codec ac97_bus snd_seq_dummy snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device snd_pcm_oss snd_mixer_oss evdev snd_pcm intel_agp snd_timer snd agpgart soundcore i2c_i801 snd_page_alloc ide_cd cdrom rtc unix
> [39525.518000] CPU:    1
> [39525.518000] EIP:    0073:[<08056990>]    Not tainted VLI
> [39525.518000] EFLAGS: 00000202   (2.6.21-ga989705c #187)
> [39525.529000] EIP is at 0x8056990
> [39525.529000] eax: 6e560d60   ebx: 0000000b   ecx: 00000000   edx: 000dd15e
> [39525.541000] esi: 00000000   edi: 6e560220   ebp: bfeb0a58   esp: bfeb0990
> [39525.547000] ds: 007b   es: 007b   fs: 0000  gs: 0033  ss: 007b
> [39525.553000] Process line (pid: 4277, ti=cf200000 task=f6f560b0 task.ti=cf200000)
> [39525.560000] Kernel panic - not syncing: Aiee, killing interrupt handler!
> 
> http://www.stardust.webpages.pl/files/tbf/bitis-gabonica/2.6.21-git8/git-console.log
> http://www.stardust.webpages.pl/files/tbf/bitis-gabonica/2.6.21-git8/git-config
> 

Nice. System was in user mode with interrupts enabled but none happened
for a long time. Maybe something forgot to schedule a timer interrupt?

(What mechanism is there to prevent this from happening?)