linux-kernel - Re: [PATCH v3 1/1] pidfd: implement PIDFD_THREAD flag for pidfd

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Date: Thu, 8 Feb 2024 10:18:40 +0100
From: Oleg Nesterov <oleg@...hat.com>
To: Christian Brauner <brauner@...nel.org>
Cc: kernel test robot <oliver.sang@...el.com>, oe-lkp@...ts.linux.dev,
	lkp@...el.com, Tycho Andersen <tycho@...ho.pizza>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: Re: [PATCH v3 1/1] pidfd: implement PIDFD_THREAD flag for
 pidfd_open()

On 02/08, Christian Brauner wrote:
>
> On Thu, Feb 08, 2024 at 03:54:44PM +0800, kernel test robot wrote:
> > 
> > 
> > Hello,
> > 
> > kernel test robot noticed "last_state.load_disk_fail" on:
> > 
> > commit: aa9c201b150f15cf12e8df8af531b2c74ae1a8fc ("[PATCH v3 1/1] pidfd: implement PIDFD_THREAD flag for pidfd_open()")
> > url: https://github.com/intel-lab-lkp/linux/commits/Oleg-Nesterov/pidfd-implement-PIDFD_THREAD-flag-for-pidfd_open/20240131-213408
> > base: https://git.kernel.org/cgit/linux/kernel/git/vfs/vfs.git vfs.all
> > patch link: https://lore.kernel.org/all/20240131132602.GA23641@redhat.com/
> > patch subject: [PATCH v3 1/1] pidfd: implement PIDFD_THREAD flag for pidfd_open()
> > 
> > in testcase: boot
> > 
> > compiler: gcc-12
> > test machine: 128 threads 2 sockets Intel(R) Xeon(R) Platinum 8358 CPU @ 2.60GHz (Ice 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/202402081434.9e1ded3-oliver.sang@intel.com
> > 
> > 
> > 
> > The kernel config and materials to reproduce are available at:
> > https://download.01.org/0day-ci/archive/20240208/202402081434.9e1ded3-oliver.sang@intel.com
> > 
> > 
> > as in dmesg in above link:
> > 
> > LKP: ttyS0: 1408: can't load the disk /dev/disk/by-id/ata-SanDisk_SDSSDH3250G_182971800454-part1, skip testing...
> > 
> > we know this should be related with some early issues but we failed to figure
> > out. so here also attached parent dmesg as dmesg-e0ee7b583f.xz FYI.
> 
> I have a hard time seeing how this would be caused by any of Oleg's
> changes. Plus, the merges from the vfs tree linked under "url:" above
> are all pretty out of date?

Yes, the patch under url still has the extra trailing ";" after "if"
so pidfd_prepare() will always fail. Fixed by Tycho.

Oleg.