Re: [Xen-devel] Xen with dom0 pvops on ultra-recent "git tip" kernel on x86_64

[Christophe Saout <christophe@xxxxxxxx>]

Hi,

> this still occurs.  So far I havent been able to get the full crash
> since I can't scroll, but from what I have on the screen it is hitting
> the BUG() in arch/x86/include/asm/mmu_context_64.h in switch_mm:

I caught one with netconsole, it always seems to be the same (happening
in different places though):

------------[ cut here ]------------
kernel BUG at /home/chtephan/linux/arch/x86/include/asm/mmu_context_64.h:35!
invalid opcode: 0000 [#1] SMP 
last sysfs file: 
/sys/devices/LNXSYSTM:00/device:00/PNP0A08:00/device:01/PNP0C09:00/PNP0C0A:00/power_supply/BAT0/energy_full
CPU 0 
Modules linked in: netconsole configfs iptable_mangle iptable_nat nf_nat 
ipt_REJECT nf_conntrack_ipv4 nf_defrag_ipv4 xt_state xt_tcpudp iptable_filter 
ip_tables x_tables bridge stp llc snd_pcm_oss snd_mixer_oss snd_seq_dummy 
snd_seq_oss snd_seq_midi_event snd_seq snd_seq_device ext3 jbd reiser4 
lzo_decompress lzo_compress nf_conntrack_irc nf_conntrack_ftp nf_conntrack 
hdaps input_polldev tun arc4 ath5k snd_hda_codec_analog snd_hda_intel 
snd_hda_codec mac80211 snd_pcm snd_timer yenta_socket cfg80211 rsrc_nonstatic 
snd e1000e pcmcia_core ata_piix video uhci_hcd snd_page_alloc ehci_hcd output
Pid: 132, comm: kblockd/0 Not tainted 2.6.29-rc1-xen-cs1 #1
RIP: e030:[<ffffffff806778c9>]  [<ffffffff806778c9>] thread_return+0x521/0x6d8
RSP: e02b:ffff8800752a1de0  EFLAGS: 00010087
RAX: ffff880073c60680 RBX: ffff880001245280 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff880075298590
RBP: ffff8800750dc2c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff880072888680
R13: ffff880072888680 R14: 0000000000000000 R15: ffff8800750e9f00
FS:  00002ba52a2ce630(0000) GS:ffffffff80a31000(0000) knlGS:0000000000000000
CS:  e033 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 00000000024aefb8 CR3: 0000000050920000 CR4: 0000000000002620
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process kblockd/0 (pid: 132, threadinfo ffff8800752a0000, task ffff880075298590)
Stack:
 ffffffff8021079b 0000000000000000 ffffffff8022eda9 0000000000000000
 ffffffff8022eda9 ffff880073da4e38 ffffffff8022eda9 ffffffff809fc280
 000000000000004f ffff880075129418 ffff880075298590 ffff8800752987d8
Call Trace:
 [<ffffffff8021079b>] ? xen_spin_lock+0xab/0xe0
 [<ffffffff8022eda9>] ? pvclock_clocksource_read+0x49/0x80
 [<ffffffff8022eda9>] ? pvclock_clocksource_read+0x49/0x80
 [<ffffffff8022eda9>] ? pvclock_clocksource_read+0x49/0x80
 [<ffffffff803db520>] ? blk_unplug_work+0x0/0x70
 [<ffffffff806797de>] ? _spin_lock_irqsave+0x2e/0x40
 [<ffffffff8025c42d>] ? worker_thread+0xdd/0x110
 [<ffffffff80260760>] ? autoremove_wake_function+0x0/0x30
 [<ffffffff8025c350>] ? worker_thread+0x0/0x110
 [<ffffffff8025c350>] ? worker_thread+0x0/0x110
 [<ffffffff80260337>] ? kthread+0x47/0x90
 [<ffffffff8021483a>] ? child_rip+0xa/0x20
 [<ffffffff8021412d>] ? retint_restore_args+0x5/0x20
 [<ffffffff80214830>] ? child_rip+0x0/0x20
Code: 40 48 89 74 24 48 e9 db fd ff ff 48 89 df e8 ff 89 b9 ff 90 57 ff 15 c7 
ef 15 00 5f e9 52 fb ff ff e8 0c 22 00 00 e9 70 f8 f
RIP  [<ffffffff806778c9>] thread_return+0x521/0x6d8
 RSP <ffff8800752a1de0>
---[ end trace c482fecdeb931bd7 ]---



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