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[Xen-devel] [BUG] Boot failures with mpt2sas / Intel RMS25JB080 module


[These lists are in the MAINTAINERS file for mpt2sas; I hope this is
the correct place to report this problem. Xen-devel CCd as this is
failing on trying to boot Xen]

When booting Xen, mpt2sas finds my Intel RMS25JB080, but fails to load
it correctly.

This is a Debian jessie (stable) system, kernel version
3.16.0-4-amd64, Xen version 4.4.1.

Relevant snippet of log output of failed boot:

[   64.095008] mpt2sas0: reply_post_free pool: pci_pool_alloc failed
[   64.535255] mpt2sas0: failure at 

...it then fails to find any of my attached drives, so cannot boot,
and I get dumped in the initramfs.

Having googled a bit, I tried pci=realloc=off on the kernel
command-line, as well as swiotlb=26422 ; neither of them changed the
failure mode

Booting bare-metal does work; relevant snippet of log output of
successful (i.e. bare-metal) boot:

[    3.977037] mpt2sas0: diag reset: SUCCESS
[    4.178627] mpt2sas0: Allocated physical memory: size(17390 kB)
[    4.178630] mpt2sas0: Current Controller Queue Depth(7931), Max Controller 
Queue Depth(8192)
[    4.178631] mpt2sas0: Scatter Gather Elements per IO(128)
[    4.409752] mpt2sas0: LSISAS2308: FWVersion(, 
ChipRevision(0x05), BiosVersion(
[    4.409755] mpt2sas0: Intel(R) Integrated RAID Module RMS25JB080
[    4.409756] mpt2sas0: Protocol=(Initiator), 
Capabilities=(Raid,TLR,EEDP,Snapshot Buffer,Diag Trace Buffer,Task Set Full,NCQ)
[    4.409846] mpt2sas0: sending port enable !!
[    5.941978] mpt2sas0: host_add: handle(0x0001), 
sas_addr(0x5001e67c17ff5000), phys(8)
[    5.980601] device-mapper: uevent: version 1.0.3
[    5.980773] device-mapper: ioctl: 4.27.0-ioctl (2013-10-30) initialised: 
[   11.823480] mpt2sas0: port enable: SUCCESS

(and then it finds the attached disks)

Fuller outputs:

i) bare-metal boot dmesg:

ii) output from failed Xen boot (captured over a serial line with
earlyprintk=xen and loglvl=all guest_loglvl=all):

iii) kernel config (stock Debian):

iv) lspci -vvv output:



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