Re: "swap_free: Bad swap file entry" and "BUG: Bad page map in process" but no swap configured

On Friday, October 07, 2016 5:01 AM Chris Friesen

I have Linux host running as a kvm hypervisor.  It's running CentOS.  (So the
kernel is based on 3.10 but with loads of stuff backported by RedHat.)  I
realize this is not a mainline kernel, but I was wondering if anyone is aware of
similar issues that had been fixed in mainline.

Hey, dunno if you're looking for commit 
	6dec97dc929 ("mm: move_ptes -- Set soft dirty bit depending on pte type")
Hillf

When doing a bunch of live migrations eventually I hit a bunch of errors that
look like this.

2016-10-03T23:13:54.017 controller-1 kernel: err [247517.457614] swap_free: Bad
swap file entry 001fe858
2016-10-03T23:13:54.017 controller-1 kernel: alert [247517.463191] BUG: Bad page
map in process qemu-kvm  pte:3fd0b000 pmd:4557cb067
2016-10-03T23:13:54.017 controller-1 kernel: alert [247517.471352]
addr:00007fefa9be4000 vm_flags:00100073 anon_vma:ffff88043f87ff80 mapping:
     (null) index:7fefa9be4
2016-10-03T23:13:54.017 controller-1 kernel: warning [247517.483510] CPU: 0 PID:
154525 Comm: qemu-kvm Tainted: G           OE  ------------
3.10.0-327.28.3.7.tis.x86_64 #1
2016-10-03T23:13:54.017 controller-1 kernel: warning [247517.483513] Hardware
name: Intel Corporation S2600WT2R/S2600WT2R, BIOS
SE5C610.86B.01.01.0016.033120161139 03/31/2016
2016-10-03T23:13:54.017 controller-1 kernel: warning [247517.483516]
00007fefa9be4000 0000000007795eb9 ffff88044007bc60 ffffffff81670503
2016-10-03T23:13:54.017 controller-1 kernel: warning [247517.483524]
ffff88044007bca8 ffffffff8115e70f 000000003fd0b000 00000007fefa9be4
2016-10-03T23:13:54.017 controller-1 kernel: warning [247517.483531]
ffff8804557cbf20 000000003fd0b000 00007fefa9c00000 00007fefa9be4000
2016-10-03T23:13:54.017 controller-1 kernel: warning [247517.483538] Call Trace:
2016-10-03T23:13:54.017 controller-1 kernel: warning [247517.483548]
[<ffffffff81670503>] dump_stack+0x19/0x1b
2016-10-03T23:13:54.017 controller-1 kernel: warning [247517.483553]
[<ffffffff8115e70f>] print_bad_pte+0x1af/0x250
2016-10-03T23:13:54.017 controller-1 kernel: warning [247517.483557]
[<ffffffff81160000>] unmap_page_range+0x5a0/0x7f0
2016-10-03T23:13:54.017 controller-1 kernel: warning [247517.483561]
[<ffffffff811602a9>] unmap_single_vma+0x59/0xd0
2016-10-03T23:13:54.017 controller-1 kernel: warning [247517.483564]
[<ffffffff81161595>] zap_page_range+0x105/0x170
2016-10-03T23:13:54.017 controller-1 kernel: warning [247517.483568]
[<ffffffff8115dd7c>] SyS_madvise+0x3bc/0x7d0
2016-10-03T23:13:54.017 controller-1 kernel: warning [247517.483573]
[<ffffffff810ca1e0>] ? SyS_futex+0x80/0x180
2016-10-03T23:13:54.017 controller-1 kernel: warning [247517.483577]
[<ffffffff81678f89>] system_call_fastpath+0x16/0x1b

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