APPLIED: [PATCH 0/5][SRU][XENIAL] Fix nbd panic on ubuntu_nbd_smoke_test

[Khaled Elmously]

On 2018-10-11 15:41:18 , Colin King wrote:
> From: Colin Ian King <colin.king at canonical.com>
> 
> BugLink: https://bugs.launchpad.net/bugs/1793464
> 
> == SRU Justification ==
> 
> When running the Ubuntu nbd autotest regression test we trip a hang
> and then a little later a panic message.  There are two upstream
> fixes required as this is actually two issues in one. One fix is to 
> not to shutdown the sock when IRQs are disable and a second to fix is
> to race in the nbd ioctl.
> 
> == Fix ==
> 
> Upstream commits:
> 
> 23272a6754b81ff6503e09c743bb4ceeeab39997
>   nbd: Remove signal usage
> 
> 1f7b5cf1be4351e60cf8ae7aab976503dd73c5f8
>   nbd: Timeouts are not user requested disconnects
> 
> 0e4f0f6f63d3416a9e529d99febfe98545427b81
>   nbd: Cleanup reset of nbd and bdev after a disconnect
> 
> c261189862c6f65117eb3b1748622a08ef49c262
>   nbd: don't shutdown sock with irq's disabled
> 
> 97240963eb308d8d21a89c0459822f7ea98463b4
>   nbd: fix race in ioctl
> 
> The first 3 patches are prerequisites required for the latter two fixes to apply and work correctly.  Most of these backports are minor patch wiggles
> required because later patches have been applied to the driver in earlier fixes to this driver.
>    
> 
> == Regression Potential ==
> 
> These fixes just touch nbd, so the regression potential is just limited to this. Secondly, we are pulling in upstream fixes that exist in Bionic and Cosmic kernels, so these are tried and tested fixes.
> 
> == Test Case ==
> 
>   1. Deploy a node with 4.4 Xenial
>   2. Run the ubuntu_nbd_smoke_test
> 
> Without the fix, we get hang/crashes.  With the fix one can run this test
> multiple times without any issues at all.
> 
> ----
> 
> Josef Bacik (1):
>   nbd: don't shutdown sock with irq's disabled
> 
> Markus Pargmann (3):
>   nbd: Remove signal usage
>   nbd: Timeouts are not user requested disconnects
>   nbd: Cleanup reset of nbd and bdev after a disconnect
> 
> Vegard Nossum (1):
>   nbd: fix race in ioctl
> 
>  drivers/block/nbd.c | 200 ++++++++++++++++++++++++++--------------------------
>  1 file changed, 99 insertions(+), 101 deletions(-)
> 
> -- 
> 2.7.4
> 
> 
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