[Xen-devel] [BUG] Bad page map in process after migration (Debian #711249)

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

A Debian user has reported this with the 3.2 kernel, it sounds vaguely
familiar, but neither I nor google can quite put my finger on it. Does
it ring any bells?

        [1295549.783990] BUG: Bad page map in process java  pte:00000166 
pmd:3bacb067
        [1295549.784005] page:ffffea0000000000 count:-1 mapcount:-128 mapping:  
        (null) index:0x0
        [1295549.784036] page flags: 0x14(referenced|dirty)
        [1295549.784044] addr:00007f879a6a2000 vm_flags:00100077 
anon_vma:ffff88003cb472a0 mapping:          (null) index:7f879a6a2
        [1295549.784052] Pid: 13198, comm: java Not tainted 3.2.0-4-amd64 #1 
Debian 3.2.41-2+deb7u2
        [1295549.784058] Call Trace:
        [1295549.784070]  [<ffffffff810ce1f5>] ? print_bad_pte+0x1a5/0x1bd
        [1295549.784075]  [<ffffffff810cde55>] ? pte_pfn+0x5/0xe
        [1295549.784083]  [<ffffffff810cfe5c>] ? unmap_vmas+0x4d5/0x6ca
        [1295549.784095]  [<ffffffff810d00e1>] ? zap_page_range+0x90/0xb8
        [1295549.784108]  [<ffffffff810d5ce0>] ? mmap_region+0x353/0x44a
        [1295549.784122]  [<ffffffff81036428>] ? should_resched+0x5/0x23
        [1295549.784133]  [<ffffffff810cdba2>] ? sys_madvise+0x3d2/0x5fc
        [1295549.784147]  [<ffffffff81053e6c>] ? recalc_sigpending+0x23/0x3c
        [1295549.784156]  [<ffffffff81054518>] ? __set_task_blocked+0x5e/0x65
        [1295549.784168]  [<ffffffff81052e40>] ? spin_unlock_irq+0xa/0xb
        [1295549.784178]  [<ffffffff8105601c>] ? sigprocmask+0x5c/0x63
        [1295549.784191]  [<ffffffff813529d2>] ? system_call_fastpath+0x16/0x1b
        [1295549.784201] Disabling lock debugging due to kernel taint

There's a bit more info and a full dmesg in
http://bugs.debian.org/711249
        
Cheers,
Ian.


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