[Xen-devel] Re: [xen-unstable test] 2885: regressions - FAIL

[Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>]

Ian Jackson writes ("[xen-unstable test] 2885: regressions - FAIL"):
>  test-amd64-xcpkern-i386-xl-multivcpu 13 guest-localmigrate.2
>         fail REGR. vs. 2856

I don't think this is a real regression; it looks more like a lost
race bug to me.  The logs contain a kernel BUG from the soft lockup
detector (below); the stack trace is of xl which is trying to call
mlock().  This is with the XCP 2.6.27 kernel.

Full logs for this specific test are here:
 
http://www.chiark.greenend.org.uk/~xensrcts/logs/2885/test-amd64-xcpkern-i386-xl-multivcpu/info.html

Ian.

Dec  1 07:46:41 BUG: soft lockup - CPU#5 stuck for 61s! [xl:23360]
Dec  1 07:46:41 Modules linked in: iptable_filter ip_tables x_tables ipv6 
bridge stp llc(N) rtc]
Dec  1 07:46:41 Supported: No, Unsupported modules are loaded
Dec  1 07:46:41  
Dec  1 07:46:41 Pid: 23360, comm: xl Tainted: G          (2.6.27.45-0.1.1 #1)
Dec  1 07:46:41 EIP: 0061:[<c0101485>] EFLAGS: 00000282 CPU: 5
Dec  1 07:46:41 EIP is at 0xc0101485
Dec  1 07:46:41 EAX: 00000024 EBX: 09df4004 ECX: b7734f48 EDX: 00000001
Dec  1 07:46:41 ESI: 00000000 EDI: 0000014d EBP: d23bbf28 ESP: d23bbd50
Dec  1 07:46:41  DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0069
Dec  1 07:46:41 CR0: 8005003b CR2: b77223d5 CR3: 1713f000 CR4: 00002660
Dec  1 07:46:41 DR0: 00000000 DR1: 00000000 DR2: 00000000 DR3: 00000000
Dec  1 07:46:41 DR6: ffff0ff0 DR7: 00000400
Dec  1 07:46:41  [<c02a5791>] ? privcmd_ioctl+0x621/0xc20
Dec  1 07:46:41  [<e116b659>] ? do_get_write_access+0x2d9/0x4c0 [jbd]
Dec  1 07:46:41  [<c011f120>] ? __wake_up+0x40/0x50
Dec  1 07:46:41  [<e116ad74>] ? journal_stop+0x154/0x230 [jbd]
Dec  1 07:46:41  [<e1215ee7>] ? __ext3_journal_stop+0x27/0x50 [ext3]
Dec  1 07:46:41  [<c0113808>] ? do_page_fault+0x388/0xec0
Dec  1 07:46:41  [<c01329e3>] ? capable+0x13/0x30
Dec  1 07:46:41  [<c019e93a>] ? d_move_locked+0x17a/0x230
Dec  1 07:46:41  [<c0193edb>] ? vfs_rename+0x36b/0x4f0
Dec  1 07:46:41  [<c016dc94>] ? follow_page+0x284/0x3a0
Dec  1 07:46:41  [<c017007e>] ? get_user_pages+0x14e/0x450
Dec  1 07:46:41  [<c02a5170>] ? privcmd_ioctl+0x0/0xc20
Dec  1 07:46:41  [<c01ca2f4>] proc_reg_unlocked_ioctl+0x64/0xf0
Dec  1 07:46:41  [<c01ca290>] ? proc_reg_unlocked_ioctl+0x0/0xf0
Dec  1 07:46:41  [<c0197f98>] vfs_ioctl+0x28/0x80
Dec  1 07:46:41  [<c019804e>] do_vfs_ioctl+0x5e/0x2e0
Dec  1 07:46:41  [<c01749dd>] ? do_mlock+0xad/0xf0
Dec  1 07:46:41  [<c0198333>] sys_ioctl+0x63/0x70
Dec  1 07:46:41  [<c0105366>] syscall_call+0x7/0xb
Dec  1 07:46:41  [<c0360000>] ? init_transmeta+0x82/0x202
Dec  1 07:46:41  =======================
Dec  1 07:47:46 BUG: soft lockup - CPU#5 stuck for 61s! [xl:23360]
Dec  1 07:47:46 Modules linked in: iptable_filter ip_tables x_tables ipv6 
bridge stp llc(N) rtc]
Dec  1 07:47:46 Supported: No, Unsupported modules are loaded
Dec  1 07:47:46  
etc.

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