On Tue, Apr 25, 2023 at 10:37:05AM +0800, Changhui Zhong wrote: > Hello, > > Below issue was triggered in my test,it caused system panic ,please > help check it. > branch: for-6.4/block > https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git > > mdadm -CR /dev/md0 -l 1 -n 2 /dev/sda /dev/sdb -e 1.0 > sgdisk -n 0:0:+100MiB /dev/md0 > cat /proc/partitions > mdadm -S /dev/md0 > mdadm -A /dev/md0 /dev/sda /dev/sdb > cat /proc/partitions > > > [ 34.219123] BUG: kernel NULL pointer dereference, address: 00000000000000fc > [ 34.219507] #PF: supervisor read access in kernel mode > [ 34.219784] #PF: error_code(0x0000) - not-present page > [ 34.220039] PGD 0 P4D 0 > [ 34.220176] Oops: 0000 [#1] PREEMPT SMP PTI > [ 34.220374] CPU: 8 PID: 1956 Comm: systemd-udevd Kdump: loaded Not > tainted 6.3.0-rc2+ #1 > [ 34.220787] Hardware name: HP ProLiant DL360 Gen9/ProLiant DL360 > Gen9, BIOS P89 05/21/2018 > [ 34.221188] RIP: 0010:blk_mq_sched_bio_merge+0x6d/0xf0 Hi Changhui, Please try the following fix: diff --git a/block/bdev.c b/block/bdev.c index 850852fe4b78..fa2838ca2e6d 100644 --- a/block/bdev.c +++ b/block/bdev.c @@ -419,7 +419,11 @@ struct block_device *bdev_alloc(struct gendisk *disk, u8 partno) bdev->bd_inode = inode; bdev->bd_queue = disk->queue; bdev->bd_stats = alloc_percpu(struct disk_stats); - bdev->bd_has_submit_bio = false; + + if (partno) + bdev->bd_has_submit_bio = disk->part0->bd_has_submit_bio; + else + bdev->bd_has_submit_bio = false; if (!bdev->bd_stats) { iput(inode); return NULL; Fixes: 9f4107b07b17 ("block: store bdev->bd_disk->fops->submit_bio state in bdev") Thanks, Ming
