linux-kernel - Re: [PATCH] PCI: Allocate maximum available buses to help extending the daisy chain

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Date:   Wed, 23 Aug 2023 22:15:49 +0800
From:   kernel test robot <oliver.sang@...el.com>
To:     Sanath S <Sanath.S@....com>
CC:     <oe-lkp@...ts.linux.dev>, <lkp@...el.com>,
        Sanjay R Mehta <sanju.mehta@....com>,
        <linux-pci@...r.kernel.org>, <bhelgaas@...gle.com>,
        <linux-kernel@...r.kernel.org>, <mario.limonciello@....com>,
        Sanath S <Sanath.S@....com>, <oliver.sang@...el.com>
Subject: Re: [PATCH] PCI: Allocate maximum available buses to help extending
 the daisy chain



Hello,

kernel test robot noticed disk issues on:

commit: 4f0dbecaea6160d50d568fcaa4e09346052f7423 ("[PATCH] PCI: Allocate maximum available buses to help extending the daisy chain")
url: https://github.com/intel-lab-lkp/linux/commits/Sanath-S/PCI-Allocate-maximum-available-buses-to-help-extending-the-daisy-chain/20230816-132324
base: https://git.kernel.org/cgit/linux/kernel/git/pci/pci.git next
patch link: https://lore.kernel.org/all/20230816051923.2287912-1-Sanath.S@amd.com/
patch subject: [PATCH] PCI: Allocate maximum available buses to help extending the daisy chain

in testcase: filebench
version: filebench-x86_64-22620e6-1_20221010
with following parameters:

	fs: xfs
	test: filemicro_statfile.f
	cpufreq_governor: performance



compiler: gcc-12
test machine: 96 threads 2 sockets Intel(R) Xeon(R) Platinum 8260L CPU @ 2.40GHz (Cascade Lake) with 128G memory

(please refer to attached dmesg/kmsg for entire log/backtrace)




If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@...el.com>
| Closes: https://lore.kernel.org/oe-lkp/202308232106.50c8f492-oliver.sang@intel.com


[    6.738560][    T1] pci 0000:17:00.0: Bridge has subordinate 0x19 but max busn 0x39, reconfiguring
...
[  238.092454][ T1230] ls: cannot access '/dev/nvme1n1p1': No such file or directory
[  238.092457][ T1230]
[  238.526845][ T1230] disk number 2 mismatch with 1 real disks: /dev/nvme1n1p1 /dev/nvme0n1p1


before this commit, we have below two disks on server:

# ls -l /dev/disk/by-path/
lrwxrwxrwx 1 root root  13 Aug 23 23:00 pci-0000:83:00.0-nvme-1 -> ../../nvme0n1
lrwxrwxrwx 1 root root  15 Aug 23 23:00 pci-0000:83:00.0-nvme-1-part1 -> ../../nvme0n1p1
lrwxrwxrwx 1 root root  13 Aug 23 23:00 pci-0000:84:00.0-nvme-1 -> ../../nvme1n1
lrwxrwxrwx 1 root root  15 Aug 23 23:00 pci-0000:84:00.0-nvme-1-part1 -> ../../nvme1n1p1

but after this commit, there is no nvme1n1p1 detected



The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20230823/202308232106.50c8f492-oliver.sang@intel.com



-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki