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Re: [Xen-devel] Regression introduced by "xen: properly account for _PAGE_NUMA during xen pte translations" (a9c8e4beeeb64c22b84c803747487857fe424b68)




On Thu, Feb 27, 2014 at 9:48 PM, Steven Noonan <steven@xxxxxxxxxxxxxx> wrote:
For the issue fixed by a9c8e4be, it was possible to trigger it using a
small test case. Does that same test work if you run it after
migrating the instance?

    #include <errno.h>
    #include <stdio.h>
    #include <stdlib.h>
    #include <sys/mman.h>

    void die(const char *what)
    {
        perror(what);
        exit(1);
    }

    int main(int arg, char **argv)
    {
        void *p = mmap(NULL, 4096, PROT_READ | PROT_WRITE, MAP_PRIVATE
| MAP_ANONYMOUS, -1, 0);

        if (p == MAP_FAILED)
                die("mmap");

        /* Tickle the page. */
        ((char *)p)[0] = 0;

        if (mprotect(p, 4096, PROT_NONE) != 0)
                die("mprotect");

        if (mprotect(p, 4096, PROT_READ) != 0)
                die("mprotect");

        if (munmap(p, 4096) != 0)
                die("munmap");

        return 0;
    }

On Thu, Feb 27, 2014 at 6:25 PM, Konrad Rzeszutek Wilk
<konrad.wilk@xxxxxxxxxx> wrote:
>
> This only shows up when using the Linux kernel as a 64-bit PV guest and
> when I have migrated and I am running iscsid and I poweroff the guest.
> Note: I can also reproduce this if I kill 'iscsid'.
>
> If I revert the above mentioned commit the problem disappears.
>
> The page flags it shows are bogus - this guest is running from RAM
> and has no swap.
>
> Here is what the console says (ignore the first BUG please):
>
> [   42.268060] xen:grant_table: Grant tables using version 1 layout
> [   42.268060] BUG: sleeping function called from invalid context at /home/konrad/ssd/konrad/linux/kernel/locking/mutex.c:96
> [   42.268060] in_atomic(): 1, irqs_disabled(): 1, pid: 9, name: migration/0
> [   42.268060] CPU: 0 PID: 9 Comm: migration/0 Not tainted 3.14.0-rc4upstream #1
> [   42.268060]  0000000000000002 ffff88003cc0dcd8 ffffffff816f0e59 ffff88003cc02630
> [   42.268060]  ffffffff81c6df80 ffff88003cc0dce8 ffffffff810cdfce ffff88003cc0dd08
> [   42.268060]  ffffffff816f3bdf ffff88003cc0dd08 0000000000000017 ffff88003cc0dd38
> [   42.268060] Call Trace:
> [   42.268060]  [<ffffffff816f0e59>] dump_stack+0x51/0x6b
> [   42.268060]  [<ffffffff810cdfce>] __might_sleep+0xce/0xf0
> [   42.268060]  [<ffffffff816f3bdf>] mutex_lock+0x1f/0x40
> [   42.268060]  [<ffffffff813f49fb>] rebind_evtchn_irq+0x3b/0xb0
> [   42.268060]  [<ffffffff81428bdc>] xen_console_resume+0x5c/0x60
> [   42.268060]  [<ffffffff813f3c0a>] xen_suspend+0x8a/0xb0
> [   42.268060]  [<ffffffff811265db>] multi_cpu_stop+0xbb/0xe0
> [   42.268060]  [<ffffffff81126520>] ? irq_cpu_stop_queue_work+0x30/0x30
> [   42.268060]  [<ffffffff81126bfa>] cpu_stopper_thread+0x4a/0x180
> [   42.268060]  [<ffffffff816f1a01>] ? __schedule+0x381/0x7e0
> [   42.268060]  [<ffffffff810cbf10>] ? smpboot_create_threads+0x80/0x80
> [   42.268060]  [<ffffffff816f612b>] ? _raw_spin_unlock_irqrestore+0x1b/0x70
> [   42.268060]  [<ffffffff810cc058>] smpboot_thread_fn+0x148/0x1e0
> [   42.268060]  [<ffffffff810cbf10>] ? smpboot_create_threads+0x80/0x80
> [   42.268060]  [<ffffffff810c490e>] kthread+0xce/0xf0
> [   42.268060]  [<ffffffff810c4840>] ? kthread_freezable_should_stop+0x80/0x80
> [   42.268060]  [<ffffffff816fe74c>] ret_from_fork+0x7c/0xb0
> [   42.268060]  [<ffffffff810c4840>] ? kthread_freezable_should_stop+0x80/0x80
> [   42.268060] PM: noirq restore of devices complete after 0.251 msecs
> [   42.268645] PM: early restore of devices complete after 0.151 msecs
>
> #
> # [   42.281199] switch: port 1(eth0) entered disabled state
> [   42.282591] PM: restore of devices complete after 11.656 msecs
> [   42.307965] switch: port 1(eth0) entered forwarding state
> [   42.307990] switch: port 1(eth0) entered forwarding state
>
> #
> #
> # [   57.312124] switch: port 1(eth0) entered forwarding state
> lspci
> # lsscsi
> # ifconfig
> eth0      Link encap:Ethernet  HWaddr 00:0F:4B:00:00:68
>           inet6 addr: fe80::20f:4bff:fe00:68/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:99 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:86 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:1000
>           RX bytes:8722 (8.5 KiB)  TX bytes:8709 (8.5 KiB)
>
> lo        Link encap:Local Loopback
>           inet addr:127.0.0.1  Mask:255.0.0.0
>           inet6 addr: ::1/128 Scope:Host
>           UP LOOPBACK RUNNING  MTU:65536  Metric:1
>           RX packets:4 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:4 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:260 (260.0 b)  TX bytes:260 (260.0 b)
>
> switch    Link encap:Ethernet  HWaddr 00:0F:4B:00:00:68
>           inet addr:192.168.102.68  Bcast:192.168.102.255  Mask:255.255.255.0
>           inet6 addr: fe80::20f:4bff:fe00:68/64 Scope:Link
>           UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
>           RX packets:96 errors:0 dropped:0 overruns:0 frame:0
>           TX packets:75 errors:0 dropped:0 overruns:0 carrier:0
>           collisions:0 txqueuelen:0
>           RX bytes:8506 (8.3 KiB)  TX bytes:7755 (7.5 KiB)
>
> # ping 1   8.8.8.8
> PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data.
> 64 bytes from 8.8.8.8: icmp_seq=1 ttl=45 time=57.0 ms
> 64 bytes from 8.8.8.8: icmp_seq=2 ttl=45 time=51.4 ms
> 64 bytes from 8.8.8.8: icmp_seq=3 ttl=45 time=51.8 ms
> ^C
> --- 8.8.8.8 ping statistics ---
> 3 packets transmitted, 3 received, 0% packet loss, time 2130ms
> rtt min/avg/max/mdev = 51.421/53.420/57.008/2.556 ms
> # poweroff
> Feb 28 02:05:30 g-pvops init: starting pid 2386, tty '': '/etc/init.d/halt'
>
> # Usage: /etc/init.d/halt {start}
>
> The system is going down NOW!
>
> Sent SIGTERM to all processes
> Feb 28 02:05:30 g-pvops exiting on signal 15
>
> [   71.195552] BUG: Bad page map in process iscsid  pte:39b22120 pmd:06953067
> [   71.195569] page:ffffea0000c9ef70 count:1 mapcount:-1 mapping:ffff88003a536490 index:0x1c8
> [   71.195576] page flags: 0x100000000080078(uptodate|dirty|lru|active|swapbacked)
> [   71.195585] page dumped because: bad pte
> [   71.195589] addr:00007fb105d37000 vm_flags:00000070 anon_vma:          (null) mapping:ffff880032006970 index:c
> [   71.195598] vma->vm_ops->fault: shmem_fault+0x0/0x70
> [   71.195603] vma->vm_file->f_op->mmap: shmem_mmap+0x0/0x30
> [   71.195613] CPU: 0 PID: 2296 Comm: iscsid Not tainted 3.14.0-rc4upstream #1
> [   71.195618]  00007fb105d37000 ffff880030ff3c28 ffffffff816f0e59 0000000000000000
> [   71.195627]  ffff8800302f8378 ffff880030ff3c78 ffffffff81199a5b ffff880030ff3c58
> [   71.195634]  ffffffff8117f6e1 ffff880030ff3c58 00007fb105d37000 ffff8800069539b8
> [   71.195642] Call Trace:
> [   71.195649]  [<ffffffff816f0e59>] dump_stack+0x51/0x6b
> [   71.195657]  [<ffffffff81199a5b>] print_bad_pte+0x1bb/0x280
> [   71.195663]  [<ffffffff8117f6e1>] ? activate_page+0xb1/0xe0
> [   71.195669]  [<ffffffff8119ad68>] unmap_single_vma+0x8c8/0x910
> [   71.195676]  [<ffffffff81040a69>] ? xen_pte_unlock+0x9/0x10
> [   71.195680]  [<ffffffff8119adfc>] unmap_vmas+0x4c/0xa0
> [   71.195688]  [<ffffffff811a2920>] exit_mmap+0x90/0x160
> [   71.195694]  [<ffffffff816f5f13>] ? _raw_spin_lock_irqsave+0x13/0x60
> [   71.195702]  [<ffffffff8109d672>] mmput+0x52/0x100
> [   71.195707]  [<ffffffff810a186c>] do_exit+0x29c/0xb90
> [   71.195712]  [<ffffffff810a3349>] ? SyS_wait4+0xa9/0xf0
> [   71.195719]  [<ffffffff810a2271>] do_group_exit+0x51/0x130
> [   71.195724]  [<ffffffff810a2362>] SyS_exit_group+0x12/0x20
> [   71.195732]  [<ffffffff816fe7f9>] system_call_fastpath+0x16/0x1b
> [   71.195736] Disabling lock debugging due to kernel taint
> [   71.195740] BUG: Bad page map in process iscsid  pte:39b23120 pmd:06953067
> [   71.195744] page:ffffea0000c9efa8 count:2 mapcount:-1 mapping:ffff88003a536490 index:0x1c9
> [   71.195751] page flags: 0x100000000080038(uptodate|dirty|lru|swapbacked)
> [   71.195759] page dumped because: bad pte
> [   71.195764] addr:00007fb105d38000 vm_flags:00000070 anon_vma:          (null) mapping:ffff880032006970 index:d
> [   71.195770] vma->vm_ops->fault: shmem_fault+0x0/0x70
> [   71.195774] vma->vm_file->f_op->mmap: shmem_mmap+0x0/0x30
> [   71.195778] CPU: 0 PID: 2296 Comm: iscsid Tainted: G    B        3.14.0-rc4upstream #1
> [   71.195783]  00007fb105d38000 ffff880030ff3c28 ffffffff816f0e59 0000000000000000
> [   71.195791]  ffff8800302f8378 ffff880030ff3c78 ffffffff81199a5b 0000000000000575
> [   71.195798]  0720072007200720 ffff880030ff3c58 00007fb105d38000 ffff8800069539c0
> [   71.195806] Call Trace:
> [   71.195810]  [<ffffffff816f0e59>] dump_stack+0x51/0x6b
> [   71.195816]  [<ffffffff81199a5b>] print_bad_pte+0x1bb/0x280
> [   71.195820]  [<ffffffff8119ad68>] unmap_single_vma+0x8c8/0x910
> [   71.195827]  [<ffffffff81040a69>] ? xen_pte_unlock+0x9/0x10
> [   71.195832]  [<ffffffff8119adfc>] unmap_vmas+0x4c/0xa0
> [   71.195839]  [<ffffffff811a2920>] exit_mmap+0x90/0x160
> [   71.195843]  [<ffffffff816f5f13>] ? _raw_spin_lock_irqsave+0x13/0x60
> [   71.195849]  [<ffffffff8109d672>] mmput+0x52/0x100
> [   71.195854]  [<ffffffff810a186c>] do_exit+0x29c/0xb90
> [   71.195858]  [<ffffffff810a3349>] ? SyS_wait4+0xa9/0xf0
> [   71.195863]  [<ffffffff810a2271>] do_group_exit+0x51/0x130
> [   71.195870]  [<ffffffff810a2362>] SyS_exit_group+0x12/0x20
> [   71.195875]  [<ffffffff816fe7f9>] system_call_fastpath+0x16/0x1b
> [   71.195880] BUG: Bad page map in process iscsid  pte:39b24120 pmd:06953067
> [   71.195884] page:ffffea0000c9efe0 count:2 mapcount:-1 mapping:ffff88003a536490 index:0x1ca
> [   71.195888] page flags: 0x100000000080038(uptodate|dirty|lru|swapbacked)
> [   71.195895] page dumped because: bad pte
> [   71.195898] addr:00007fb105d39000 vm_flags:00000070 anon_vma:          (null) mapping:ffff880032006970 index:e
> [   71.195904] vma->vm_ops->fault: shmem_fault+0x0/0x70
> [   71.195908] vma->vm_file->f_op->mmap: shmem_mmap+0x0/0x30
> [   71.195912] CPU: 0 PID: 2296 Comm: iscsid Tainted: G    B        3.14.0-rc4upstream #1
> [   71.195916]  00007fb105d39000 ffff880030ff3c28 ffffffff816f0e59 0000000000000000
> [   71.195923]  ffff8800302f8378 ffff880030ff3c78 ffffffff81199a5b 000000000000058e
> [   71.195929]  0720072007200720 ffff880030ff3c58 00007fb105d39000 ffff8800069539c8
> [   71.195935] Call Trace:
> [   71.195939]  [<ffffffff816f0e59>] dump_stack+0x51/0x6b
> [   71.195944]  [<ffffffff81199a5b>] print_bad_pte+0x1bb/0x280
> [   71.195948]  [<ffffffff8119ad68>] unmap_single_vma+0x8c8/0x910
> [   71.195953]  [<ffffffff81040a69>] ? xen_pte_unlock+0x9/0x10
> [   71.195958]  [<ffffffff8119adfc>] unmap_vmas+0x4c/0xa0
> [   71.195963]  [<ffffffff811a2920>] exit_mmap+0x90/0x160
> [   71.195967]  [<ffffffff816f5f13>] ? _raw_spin_lock_irqsave+0x13/0x60
> [   71.195973]  [<ffffffff8109d672>] mmput+0x52/0x100
> [   71.195977]  [<ffffffff810a186c>] do_exit+0x29c/0xb90
> [   71.195982]  [<ffffffff810a3349>] ? SyS_wait4+0xa9/0xf0
> [   71.195987]  [<ffffffff810a2271>] do_group_exit+0x51/0x130
> [   71.195992]  [<ffffffff810a2362>] SyS_exit_group+0x12/0x20
> [   71.195997]  [<ffffffff816fe7f9>] system_call_fastpath+0x16/0x1b
> [   71.196001] BUG: Bad page map in process iscsid  pte:39b25120 pmd:06953067
> [   71.196005] page:ffffea0000c9f018 count:2 mapcount:-1 mapping:ffff88003a536490 index:0x1cb
> [   71.362165] page flags: 0x100000000080038(uptodate|dirty|lru|swapbacked)
> [   71.362172] page dumped because: bad pte
> [   71.362175] addr:00007fb105d3a000 vm_flags:00000070 anon_vma:          (null) mapping:ffff880032006970 index:f
> [   71.362181] vma->vm_ops->fault: shmem_fault+0x0/0x70
> [   71.362185] vma->vm_file->f_op->mmap: shmem_mmap+0x0/0x30
> [   71.362193] CPU: 0 PID: 2296 Comm: iscsid Tainted: G    B        3.14.0-rc4upstream #1
> [   71.362197]  00007fb105d3a000 ffff880030ff3c28 ffffffff816f0e59 0000000000000000
> [   71.362206]  ffff8800302f8378 ffff880030ff3c78 ffffffff81199a5b 00000000000005a7
> [   71.362212]  0720072007200720 ffff880030ff3c58 00007fb105d3a000 ffff8800069539d0
> [   71.362221] Call Trace:
> [   71.362225]  [<ffffffff816f0e59>] dump_stack+0x51/0x6b
> [   71.362230]  [<ffffffff81199a5b>] print_bad_pte+0x1bb/0x280
> [   71.362241]  [<ffffffff8119ad68>] unmap_single_vma+0x8c8/0x910
> [   71.362247]  [<ffffffff81040a69>] ? xen_pte_unlock+0x9/0x10
> [   71.362254]  [<ffffffff8119adfc>] unmap_vmas+0x4c/0xa0
> [   71.362258]  [<ffffffff811a2920>] exit_mmap+0x90/0x160
> [   71.362263]  [<ffffffff816f5f13>] ? _raw_spin_lock_irqsave+0x13/0x60
> [   71.362270]  [<ffffffff8109d672>] mmput+0x52/0x100
> [   71.362276]  [<ffffffff810a186c>] do_exit+0x29c/0xb90
> [   71.362282]  [<ffffffff810a3349>] ? SyS_wait4+0xa9/0xf0
> [   71.362287]  [<ffffffff810a2271>] do_group_exit+0x51/0x130
> [   71.362292]  [<ffffffff810a2362>] SyS_exit_group+0x12/0x20
> [   71.362297]  [<ffffffff816fe7f9>] system_call_fastpath+0x16/0x1b
> [   71.364639] BUG: Bad page state in process iscsid  pfn:39b25
> [   71.364651] page:ffffea0000c9f018 count:0 mapcount:-1 mapping:ffff88003a536490 index:0x1cb
> [   71.364656] page flags: 0x100000000080018(uptodate|dirty|swapbacked)
> [   71.364663] page dumped because: non-NULL mapping
> [   71.364666] Modules linked in: dm_multipath dm_mod xen_evtchn iscsi_boot_sysfs iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi scsi_mod libcrc32c crc32c fbcon tileblit font radeon bitblit softcursor ttm drm_kms_helper xen_blkfront xen_netfront xen_fbfront fb_sys_fops sysimgblt sysfillrect syscopyarea xen_kbdfront xenfs xen_privcmd
> [   71.364706] CPU: 0 PID: 2296 Comm: iscsid Tainted: G    B        3.14.0-rc4upstream #1
> [   71.364711]  ffffffff8197f00f ffff880030ff3bb8 ffffffff816f0e59 ffffffff8197f00f
> [   71.364718]  ffffea0000c9f018 ffff880030ff3be8 ffffffff811751a0 ffff880030ff3c48
> [   71.364724]  0000000000000001 ffffea0000c9f018 0000000000000000 ffff880030ff3c48
> [   71.364733] Call Trace:
> [   71.364739]  [<ffffffff816f0e59>] dump_stack+0x51/0x6b
> [   71.364748]  [<ffffffff811751a0>] bad_page+0xd0/0x120
> [   71.364753]  [<ffffffff81175335>] free_pages_prepare+0x145/0x160
> [   71.364760]  [<ffffffff81041642>] ? xen_pte_val+0x32/0x40
> [   71.364768]  [<ffffffff8117993b>] free_hot_cold_page+0x3b/0x150
> [   71.364773]  [<ffffffff81179fc7>] free_hot_cold_page_list+0x47/0xb0
> [   71.364780]  [<ffffffff8117e3ad>] release_pages+0x7d/0x230
> [   71.364785]  [<ffffffff811b04c4>] free_pages_and_swap_cache+0xb4/0xe0
> [   71.364791]  [<ffffffff81099507>] ? flush_tlb_mm_range+0x57/0x1b0
> [   71.364798]  [<ffffffff81199cb7>] tlb_flush_mmu+0x57/0xa0
> [   71.364803]  [<ffffffff81199d0f>] tlb_finish_mmu+0xf/0x40
> [   71.364810]  [<ffffffff811a2947>] exit_mmap+0xb7/0x160
> [   71.364815]  [<ffffffff816f5f12>] ? _raw_spin_lock_irqsave+0x12/0x60
> [   71.364820]  [<ffffffff8109d672>] mmput+0x52/0x100
> [   71.364825]  [<ffffffff810a186c>] do_exit+0x29c/0xb90
> [   71.364830]  [<ffffffff810a3349>] ? SyS_wait4+0xa9/0xf0
> [   71.364835]  [<ffffffff810a2271>] do_group_exit+0x51/0x130
> [   71.364842]  [<ffffffff810a2362>] SyS_exit_group+0x12/0x20
> [   71.364848]  [<ffffffff816fe7f9>] system_call_fastpath+0x16/0x1b
> [   71.364854] BUG: Bad page state in process iscsid  pfn:39b24
> [   71.364858] page:ffffea0000c9efe0 count:0 mapcount:-1 mapping:ffff88003a536490 index:0x1ca
> [   71.364863] page flags: 0x100000000080018(uptodate|dirty|swapbacked)
> [   71.364871] page dumped because: non-NULL mapping
> [   71.364874] Modules linked in: dm_multipath dm_mod xen_evtchn iscsi_boot_sysfs iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi scsi_mod libcrc32c crc32c fbcon tileblit font radeon bitblit softcursor ttm drm_kms_helper xen_blkfront xen_netfront xen_fbfront fb_sys_fops sysimgblt sysfillrect syscopyarea xen_kbdfront xenfs xen_privcmd
> [   71.364906] CPU: 0 PID: 2296 Comm: iscsid Tainted: G    B        3.14.0-rc4upstream #1
> [   71.364913]  ffffffff8197f00f ffff880030ff3bb8 ffffffff816f0e59 ffffffff8197f00f
> [   71.364919]  ffffea0000c9efe0 ffff880030ff3be8 ffffffff811751a0 ffff880030ff3c48
> [   71.364925]  0000000000000001 ffffea0000c9efe0 0000000000000000 ffff880030ff3c48
> [   71.364933] Call Trace:
> [   71.364938]  [<ffffffff816f0e59>] dump_stack+0x51/0x6b
> [   71.364945]  [<ffffffff811751a0>] bad_page+0xd0/0x120
> [   71.364950]  [<ffffffff81175335>] free_pages_prepare+0x145/0x160
> [   71.364955]  [<ffffffff81041642>] ? xen_pte_val+0x32/0x40
> [   71.364960]  [<ffffffff8117993b>] free_hot_cold_page+0x3b/0x150
> [   71.364965]  [<ffffffff81179fc7>] free_hot_cold_page_list+0x47/0xb0
> [   71.364970]  [<ffffffff8117e3ad>] release_pages+0x7d/0x230
> [   71.364975]  [<ffffffff811b04c4>] free_pages_and_swap_cache+0xb4/0xe0
> [   71.364982]  [<ffffffff81099507>] ? flush_tlb_mm_range+0x57/0x1b0
> [   71.364987]  [<ffffffff81199cb7>] tlb_flush_mmu+0x57/0xa0
> [   71.364994]  [<ffffffff81199d0f>] tlb_finish_mmu+0xf/0x40
> [   71.364999]  [<ffffffff811a2947>] exit_mmap+0xb7/0x160
> [   71.365004]  [<ffffffff816f5f12>] ? _raw_spin_lock_irqsave+0x12/0x60
> [   71.365009]  [<ffffffff8109d672>] mmput+0x52/0x100
> [   71.365015]  [<ffffffff810a186c>] do_exit+0x29c/0xb90
> [   71.365020]  [<ffffffff810a3349>] ? SyS_wait4+0xa9/0xf0
> [   71.365025]  [<ffffffff810a2271>] do_group_exit+0x51/0x130
> [   71.365030]  [<ffffffff810a2362>] SyS_exit_group+0x12/0x20
> [   71.365035]  [<ffffffff816fe7f9>] system_call_fastpath+0x16/0x1b
> [   71.365039] BUG: Bad page state in process iscsid  pfn:39b23
> [   71.365043] page:ffffea0000c9efa8 count:0 mapcount:-1 mapping:ffff88003a536490 index:0x1c9
> [   71.365047] page flags: 0x100000000080018(uptodate|dirty|swapbacked)
> [   71.365074] page dumped because: non-NULL mapping
> [   71.365077] Modules linked in: dm_multipath dm_mod xen_evtchn iscsi_boot_sysfs iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi scsi_mod libcrc32c crc32c fbcon tileblit font radeon bitblit softcursor ttm drm_kms_helper xen_blkfront xen_netfront xen_fbfront fb_sys_fops sysimgblt sysfillrect syscopyarea xen_kbdfront xenfs xen_privcmd
> [   71.365104] CPU: 0 PID: 2296 Comm: iscsid Tainted: G    B        3.14.0-rc4upstream #1
> [   71.365109]  ffffffff8197f00f ffff880030ff3bb8 ffffffff816f0e59 ffffffff8197f00f
> [   71.365115]  ffffea0000c9efa8 ffff880030ff3be8 ffffffff811751a0 ffff880030ff3c48
> [   71.365121]  0000000000000001 ffffea0000c9efa8 0000000000000000 ffff880030ff3c48
> [   71.365127] Call Trace:
> [   71.365131]  [<ffffffff816f0e59>] dump_stack+0x51/0x6b
> [   71.365136]  [<ffffffff811751a0>] bad_page+0xd0/0x120
> [   71.365141]  [<ffffffff81175335>] free_pages_prepare+0x145/0x160
> [   71.365146]  [<ffffffff81041642>] ? xen_pte_val+0x32/0x40
> [   71.365151]  [<ffffffff8117993b>] free_hot_cold_page+0x3b/0x150
> [   71.365155]  [<ffffffff81179fc7>] free_hot_cold_page_list+0x47/0xb0
> [   71.365160]  [<ffffffff8117e3ad>] release_pages+0x7d/0x230
> [   71.365165]  [<ffffffff811b04c4>] free_pages_and_swap_cache+0xb4/0xe0
> [   71.365170]  [<ffffffff81099507>] ? flush_tlb_mm_range+0x57/0x1b0
> [   71.365175]  [<ffffffff81199cb7>] tlb_flush_mmu+0x57/0xa0
> [   71.365180]  [<ffffffff81199d0f>] tlb_finish_mmu+0xf/0x40
> [   71.562344]  [<ffffffff811a2947>] exit_mmap+0xb7/0x160
> [   71.562349]  [<ffffffff816f5f12>] ? _raw_spin_lock_irqsave+0x12/0x60
> [   71.562354]  [<ffffffff8109d672>] mmput+0x52/0x100
> [   71.562359]  [<ffffffff810a186c>] do_exit+0x29c/0xb90
> [   71.562364]  [<ffffffff810a3349>] ? SyS_wait4+0xa9/0xf0
> [   71.562369]  [<ffffffff810a2271>] do_group_exit+0x51/0x130
> [   71.562379]  [<ffffffff810a2362>] SyS_exit_group+0x12/0x20
> [   71.562387]  [<ffffffff816fe7f9>] system_call_fastpath+0x16/0x1b
> [   71.562391] BUG: Bad page state in process iscsid  pfn:39b22
> [   71.562395] page:ffffea0000c9ef70 count:0 mapcount:-1 mapping:ffff88003a536490 index:0x1c8
> [   71.562399] page flags: 0x100000000080018(uptodate|dirty|swapbacked)
> [   71.562413] page dumped because: non-NULL mapping
> [   71.562420] Modules linked in: dm_multipath dm_mod xen_evtchn iscsi_boot_sysfs iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi scsi_mod libcrc32c crc32c fbcon tileblit font radeon bitblit softcursor ttm drm_kms_helper xen_blkfront xen_netfront xen_fbfront fb_sys_fops sysimgblt sysfillrect syscopyarea xen_kbdfront xenfs xen_privcmd
> [   71.562456] CPU: 0 PID: 2296 Comm: iscsid Tainted: G    B        3.14.0-rc4upstream #1
> [   71.562461]  ffffffff8197f00f ffff880030ff3bb8 ffffffff816f0e59 ffffffff8197f00f
> [   71.562467]  ffffea0000c9ef70 ffff880030ff3be8 ffffffff811751a0 ffff880030ff3c48
> [   71.562476]  0000000000000001 ffffea0000c9ef70 0000000000000000 ffff880030ff3c48
> [   71.562486] Call Trace:
> [   71.562490]  [<ffffffff816f0e59>] dump_stack+0x51/0x6b
> [   71.562495]  [<ffffffff811751a0>] bad_page+0xd0/0x120
> [   71.562500]  [<ffffffff81175335>] free_pages_prepare+0x145/0x160
> [   71.562515]  [<ffffffff81041642>] ? xen_pte_val+0x32/0x40
> [   71.562520]  [<ffffffff8117993b>] free_hot_cold_page+0x3b/0x150
> [   71.562525]  [<ffffffff81179fc7>] free_hot_cold_page_list+0x47/0xb0
> [   71.562535]  [<ffffffff8117e3ad>] release_pages+0x7d/0x230
> [   71.562544]  [<ffffffff811b04c4>] free_pages_and_swap_cache+0xb4/0xe0
> [   71.562550]  [<ffffffff81099507>] ? flush_tlb_mm_range+0x57/0x1b0
> [   71.562555]  [<ffffffff81199cb7>] tlb_flush_mmu+0x57/0xa0
> [   71.562561]  [<ffffffff81199d0f>] tlb_finish_mmu+0xf/0x40
> [   71.562568]  [<ffffffff811a2947>] exit_mmap+0xb7/0x160
> [   71.562579]  [<ffffffff816f5f12>] ? _raw_spin_lock_irqsave+0x12/0x60
> [   71.562584]  [<ffffffff8109d672>] mmput+0x52/0x100
> [   71.562594]  [<ffffffff810a186c>] do_exit+0x29c/0xb90
> [   71.562603]  [<ffffffff810a3349>] ? SyS_wait4+0xa9/0xf0
> [   71.562608]  [<ffffffff810a2271>] do_group_exit+0x51/0x130
> [   71.562613]  [<ffffffff810a2362>] SyS_exit_group+0x12/0x20
> [   71.562617]  [<ffffffff816fe7f9>] system_call_fastpath+0x16/0x1b
>
> Sent SIGKILL to all processes
>
> Requesting system poweroff
> [   73.375423] reboot: System halted


Nice, I will also look at this. I have not tested the above mentioned patch with migration though.

--
Elena 
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