On Fri, Jun 19, 2020 at 03:43:39PM +0200, gregkh@linuxfoundation.org wrote:
The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 15b81ce5abdc4b502aa31dff2d415b79d2349d2f Mon Sep 17 00:00:00 2001 From: "Ahmed S. Darwish" a.darwish@linutronix.de Date: Wed, 3 Jun 2020 16:49:48 +0200 Subject: [PATCH] block: nr_sects_write(): Disable preemption on seqcount write
For optimized block readers not holding a mutex, the "number of sectors" 64-bit value is protected from tearing on 32-bit architectures by a sequence counter.
Disable preemption before entering that sequence counter's write side critical section. Otherwise, the read side can preempt the write side section and spin for the entire scheduler tick. If the reader belongs to a real-time scheduling class, it can spin forever and the kernel will livelock.
Fixes: c83f6bf98dc1 ("block: add partition resize function to blkpg ioctl") Cc: stable@vger.kernel.org Signed-off-by: Ahmed S. Darwish a.darwish@linutronix.de Reviewed-by: Sebastian Andrzej Siewior bigeasy@linutronix.de Signed-off-by: Jens Axboe axboe@kernel.dk
part_nr_sects_write() was in include/linux/genhd.h before 581e26004a09 ("block: move block layer internals out of include/linux/genhd.h"). Fixed and queued for all branched.