[Bug 42829] KVM Guest with virtio network driver loses network connectivity

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=42829





--- Comment #6 from Steve <stefan.bosak@gmail.com>  2012-03-02 01:05:35 ---
My results:
===========

git bisect log:
---------------
git bisect start
# good: [2c53b436a30867eb6b47dd7bab23ba638d1fb0d2] Linux 3.0-rc3
git bisect good 2c53b436a30867eb6b47dd7bab23ba638d1fb0d2
# bad: [b0af8dfdd67699e25083478c63eedef2e72ebd85] Linux 3.0-rc5
git bisect bad b0af8dfdd67699e25083478c63eedef2e72ebd85
# bad: [c01ad4081939f91ebd7277e8e731fd90ceb3e632] Merge branch 'for-linus' of
git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
git bisect bad c01ad4081939f91ebd7277e8e731fd90ceb3e632
# bad: [f4ef084226f82ca923bf0a2658bb2876bd215ec1] Merge branch
'fbdev-fixes-for-linus' of
git://git.kernel.org/pub/scm/linux/kernel/git/lethal/fbdev-3.x
git bisect bad f4ef084226f82ca923bf0a2658bb2876bd215ec1
# bad: [bd5dc17be87b3a3073d50b23802647db3ae3fa8e] uts: make default hostname
configurable, rather than always using "(none)"
git bisect bad bd5dc17be87b3a3073d50b23802647db3ae3fa8e
# bad: [f39e8409955fad210a9a7169cc53c4c18daaef3a] Merge branch 'drm-fixes' of
git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6
git bisect bad f39e8409955fad210a9a7169cc53c4c18daaef3a
# bad: [81eb3dd8438802138ac9ce12428632f35562c060] Merge branch 'for-linus' of
git://neil.brown.name/md
git bisect bad 81eb3dd8438802138ac9ce12428632f35562c060
# good: [9864c0053d3da4c5731ac8a6c4835179310bd40a] md: Using poll  /proc/mdstat
can monitor the events of adding a spare disks
git bisect good 9864c0053d3da4c5731ac8a6c4835179310bd40a
# bad: [9b2dc8b665932a8e681a7ab3237f60475e75e161] md/raid5: fix
raid5_set_bi_hw_segments
git bisect bad 9b2dc8b665932a8e681a7ab3237f60475e75e161
# bad: [27d5ea04d08bea37bf651090e5f3c573d2390df8] md/bitmap: use proper
accessor macro
git bisect bad 27d5ea04d08bea37bf651090e5f3c573d2390df8
# bad: [01393f3d5836b7d62e925e6f4658a7eb22b83a11] md: check ->hot_remove_disk
when removing disk
git bisect bad 01393f3d5836b7d62e925e6f4658a7eb22b83a11


git bisect message:
-------------------
01393f3d5836b7d62e925e6f4658a7eb22b83a11 is the first bad commit
commit 01393f3d5836b7d62e925e6f4658a7eb22b83a11
Author: Namhyung Kim <namhyung@gmail.com>
Date:   Thu Jun 9 11:42:54 2011 +1000

    md: check ->hot_remove_disk when removing disk

    Check pers->hot_remove_disk instead of pers->hot_add_disk in slot_store()
    during disk removal. The linear personality only has ->hot_add_disk and
    no ->hot_remove_disk, so that removing disk in the array resulted to
    following kernel bug:

    $ sudo mdadm --create /dev/md0 --level=linear --raid-devices=4
/dev/loop[0-3]
    $ echo none | sudo tee /sys/block/md0/md/dev-loop2/slot
     BUG: unable to handle kernel NULL pointer dereference at           (null)
     IP: [<          (null)>]           (null)
     PGD c9f5d067 PUD 8575a067 PMD 0
     Oops: 0010 [#1] SMP
     CPU 2
     Modules linked in: linear loop bridge stp llc kvm_intel kvm asus_atk0110
sr_mod cdrom sg

     Pid: 10450, comm: tee Not tainted 3.0.0-rc1-leonard+ #173 System
manufacturer System Product Name/P5G41TD-M PRO
     RIP: 0010:[<0000000000000000>]  [<          (null)>]           (null)
     RSP: 0018:ffff880085757df0  EFLAGS: 00010282
     RAX: ffffffffa00168e0 RBX: ffff8800d1431800 RCX: 000000000000006e
     RDX: 0000000000000001 RSI: 0000000000000002 RDI: ffff88008543c000
     RBP: ffff880085757e48 R08: 0000000000000002 R09: 000000000000000a
     R10: 0000000000000000 R11: ffff88008543c2e0 R12: 00000000ffffffff
     R13: ffff8800b4641000 R14: 0000000000000005 R15: 0000000000000000
     FS:  00007fe8c9e05700(0000) GS:ffff88011fa00000(0000)
knlGS:0000000000000000
     CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
     CR2: 0000000000000000 CR3: 00000000b4502000 CR4: 00000000000406e0
     DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
     DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
     Process tee (pid: 10450, threadinfo ffff880085756000, task
ffff8800c9f08000)
     Stack:
      ffffffff8138496a ffff8800b4641000 ffff88008543c268 0000000000000000
      ffff8800b4641000 ffff88008543c000 ffff8800d1431868 ffffffff81a78a90
      ffff8800b4641000 ffff88008543c000 ffff8800d1431800 ffff880085757e98
     Call Trace:
      [<ffffffff8138496a>] ? slot_store+0xaa/0x265
      [<ffffffff81384bae>] rdev_attr_store+0x89/0xa8
      [<ffffffff8115a96a>] sysfs_write_file+0x108/0x144
      [<ffffffff81106b87>] vfs_write+0xb1/0x10d
      [<ffffffff8106e6c0>] ? trace_hardirqs_on_caller+0x111/0x135
      [<ffffffff81106cac>] sys_write+0x4d/0x77
      [<ffffffff814fe702>] system_call_fastpath+0x16/0x1b
     Code:  Bad RIP value.
     RIP  [<          (null)>]           (null)
      RSP <ffff880085757df0>
     CR2: 0000000000000000
     ---[ end trace ba5fc64319a826fb ]---

    Signed-off-by: Namhyung Kim <namhyung@gmail.com>
    Cc: stable@kernel.org
    Signed-off-by: NeilBrown <neilb@suse.de>

:040000 040000 e3d19f53113f5bb5faef422958607e4f0131d235
eab9913143e1c027df693bf1fa57475da77bd36e M      drivers


How could I help now ?

Thank you for your time.

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