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| author | Bart Van Assche <bart.vanassche@wdc.com> | 2018-06-27 12:55:18 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-06-28 09:51:30 -0600 |
| commit | 297ba57dcdec7ea37e702bcf1a577ac32a034e21 (patch) | |
| tree | 5a3d287ce53462625a831f60d2354592e44186df /block | |
| parent | 15bfd21fbc5d35834b9ea383dc458a1f0c9e3434 (diff) | |
| download | linux-stable-297ba57dcdec7ea37e702bcf1a577ac32a034e21.tar.gz linux-stable-297ba57dcdec7ea37e702bcf1a577ac32a034e21.tar.bz2 linux-stable-297ba57dcdec7ea37e702bcf1a577ac32a034e21.zip | |
block: Fix cloning of requests with a special payload
This patch avoids that removing a path controlled by the dm-mpath driver
while mkfs is running triggers the following kernel bug:
kernel BUG at block/blk-core.c:3347!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 20 PID: 24369 Comm: mkfs.ext4 Not tainted 4.18.0-rc1-dbg+ #2
RIP: 0010:blk_end_request_all+0x68/0x70
Call Trace:
<IRQ>
dm_softirq_done+0x326/0x3d0 [dm_mod]
blk_done_softirq+0x19b/0x1e0
__do_softirq+0x128/0x60d
irq_exit+0x100/0x110
smp_call_function_single_interrupt+0x90/0x330
call_function_single_interrupt+0xf/0x20
</IRQ>
Fixes: f9d03f96b988 ("block: improve handling of the magic discard payload")
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Johannes Thumshirn <jthumshirn@suse.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-core.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index afd2596ea3d3..f84a9b7b6f5a 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -3473,6 +3473,10 @@ static void __blk_rq_prep_clone(struct request *dst, struct request *src) dst->cpu = src->cpu; dst->__sector = blk_rq_pos(src); dst->__data_len = blk_rq_bytes(src); + if (src->rq_flags & RQF_SPECIAL_PAYLOAD) { + dst->rq_flags |= RQF_SPECIAL_PAYLOAD; + dst->special_vec = src->special_vec; + } dst->nr_phys_segments = src->nr_phys_segments; dst->ioprio = src->ioprio; dst->extra_len = src->extra_len; |