Re: [Xen-devel] 2.6.27 - SMP enabled, but only 1 CPU

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Wed, 2008-11-05 at 10:31 -0500, Christopher S. Aker wrote:
> 2.6.28-rc3      - Brought up 1 CPUs, eventually dies with: 
> http://p.linode.com/1408

I've been seeing this too. I bisected it down to:

        ab00fee30cddf975200b3c97aef25bea144a0d89 is first bad commit
        commit ab00fee30cddf975200b3c97aef25bea144a0d89
        Author: Jan Beulich <jbeulich@xxxxxxxxxx>
        Date:   Thu Oct 30 10:37:21 2008 +0000
        
            i386/PAE: fix pud_page()
            
            Impact: cleanup
            
            To the unsuspecting user it is quite annoying that this broken and
            inconsistent with x86-64 definition still exists.
            
            Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
            Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
        
        :040000 040000 3b49a9d3792e9f02dd799ad4deb69922d2a085d0 
f0136498ef53b36172dca595f11a784f43bebcea M      arch

It's late so figuring out how it broke can wait for tomorrow.

The interesting bit from the link given is below.

Ian.


1 multicall(s) failed: cpu 0
Pid: 1, comm: swapper Not tainted 2.6.28-rc3-test1 #1
Call Trace:
 [<c0103e41>] xen_mc_flush+0xb1/0x180
 [<c010478f>] xen_do_pin+0x3f/0x90
 [<c0104e3f>] __xen_pgd_pin+0xcf/0x140
 [<c0104f0d>] xen_activate_mm+0x1d/0x30
 [<c018f12c>] flush_old_exec+0x29c/0x740
 [<c018e2db>] kernel_read+0x3b/0x60
 [<c01bd228>] load_elf_binary+0x198/0x16c0
 [<c0104159>] xen_set_pte+0x19/0x30
 [<c0173ef6>] handle_mm_fault+0xa46/0xc70
 [<c01719be>] vm_normal_page+0x4e/0xa0
 [<c0171cd9>] follow_page+0x2c9/0x320
 [<c0174245>] __get_user_pages+0x125/0x3e0
 [<c018e0ca>] get_arg_page+0x4a/0xb0
 [<c01bd090>] load_elf_binary+0x0/0x16c0
 [<c018fb32>] search_binary_handler+0xa2/0x230
 [<c018fe88>] do_execve+0x1c8/0x210
 [<c010685f>] sys_execve+0x2f/0x50
 [<c01085b6>] syscall_call+0x7/0xb
 [<c058007b>] sctp_setsockopt+0xd2b/0x1060
 [<c01800d8>] sys_swapon+0x308/0xaf0
 [<c010c4fc>] kernel_execve+0x1c/0x30
 [<c0102292>] init_post+0xb2/0x100
 [<c01092f3>] kernel_thread_helper+0x7/0x10
  call  1/8: op=14 arg=[d5963000] result=0
  call  2/8: op=14 arg=[d5964000] result=0
  call  3/8: op=14 arg=[d5965000] result=0
  call  4/8: op=14 arg=[d5968000] result=0
  call  5/8: op=26 arg=[c12d5880] result=0
  call  6/8: op=14 arg=[d5962000] result=0
  call  7/8: op=14 arg=[c12b2000] result=0
  call  8/8: op=26 arg=[c12d5890] result=-22
BUG: unable to handle kernel paging request at c12b2d0c
IP: [<c0106550>] xen_spin_unlock+0x0/0x10
*pdpt = 00000002ccfb6027 
Oops: 0003 [#1] SMP 
last sysfs file: 
Modules linked in:
 
Pid: 1, comm: swapper Not tainted (2.6.28-rc3-test1 #1) 
EIP: 0061:[<c0106550>] EFLAGS: 00010002 CPU: 0
EIP is at xen_spin_unlock+0x0/0x10
EAX: c12b2d0c EBX: 00000001 ECX: 00000000 EDX: c12d5a80
ESI: 00000001 EDI: c12d5a80 EBP: c12d5080 ESP: d603fd38
 DS: 007b ES: 007b FS: 00d8 GS: 0000 SS: e021
Process swapper (pid: 1, ti=d603e000 task=d603d8a0 task.ti=d603e000)
Stack:
 c0104245 c0103eb3 c062b9a4 00000008 00000008 0000001a c12d5890 ffffffea
 00000000 00000003 00000000 00000000 d5960e40 c0104e3f 15966001 00000000
 d5962000 d5960e40 d5960e84 d603d8a0 d603dbe4 c0104f0d d5960e40 c0699d00
Call Trace:
 [<c0104245>] xen_pte_unlock+0x5/0x10
 [<c0103eb3>] xen_mc_flush+0x123/0x180
 [<c0104e3f>] __xen_pgd_pin+0xcf/0x140
 [<c0104f0d>] xen_activate_mm+0x1d/0x30
 [<c018f12c>] flush_old_exec+0x29c/0x740
 [<c018e2db>] kernel_read+0x3b/0x60
 [<c01bd228>] load_elf_binary+0x198/0x16c0
 [<c0104159>] xen_set_pte+0x19/0x30
 [<c0173ef6>] handle_mm_fault+0xa46/0xc70
 [<c01719be>] vm_normal_page+0x4e/0xa0
 [<c0171cd9>] follow_page+0x2c9/0x320
 [<c0174245>] __get_user_pages+0x125/0x3e0
 [<c018e0ca>] get_arg_page+0x4a/0xb0
 [<c01bd090>] load_elf_binary+0x0/0x16c0
 [<c018fb32>] search_binary_handler+0xa2/0x230
 [<c018fe88>] do_execve+0x1c8/0x210
 [<c010685f>] sys_execve+0x2f/0x50
 [<c01085b6>] syscall_call+0x7/0xb
 [<c058007b>] sctp_setsockopt+0xd2b/0x1060
 [<c01800d8>] sys_swapon+0x308/0xaf0
 [<c010c4fc>] kernel_execve+0x1c/0x30
 [<c0102292>] init_post+0xb2/0x100
 [<c01092f3>] kernel_thread_helper+0x7/0x10
Code: 6d c0 e8 d4 51 2c 00 83 f8 0f 89 c1 7f 1a 8b 04 8d 80 95 6d c0 39
34 03 75 e1 5b ba 03 00 00 00 89 c8 5e e9 73 c2 2d 00 5b 5e c3 <c6> 00
00 66 83 78 02 00 75 01 c3 eb b3 8d 76 00 0f 0b eb fe 8d 
EIP: [<c0106550>] xen_spin_unlock+0x0/0x10 SS:ESP e021:d603fd38
---[ end trace 72dbea1e75327c37 ]--- 



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