| Message ID | b725da99-d649-6f1d-af82-c3e482f7f6e@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | MD fixes for the LVM2 testsuite | expand |
On Wed, Jan 17, 2024 at 10:22 AM Mikulas Patocka <mpatocka@redhat.com> wrote: > [...] > Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> > Fixes: c467e97f079f ("md/raid6: use valid sector values to determine if an I/O should wait on the reshape") > Cc: stable@vger.kernel.org # v6.1+ > > --- > drivers/md/raid5.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > Index: linux-2.6/drivers/md/raid5.c > =================================================================== > --- linux-2.6.orig/drivers/md/raid5.c > +++ linux-2.6/drivers/md/raid5.c > @@ -5851,7 +5851,7 @@ static bool stripe_ahead_of_reshape(stru > continue; > > min_sector = min(min_sector, sh->dev[dd_idx].sector); > - max_sector = max(max_sector, sh->dev[dd_idx].sector); > + max_sector = min(max_sector, sh->dev[dd_idx].sector); This looks wrong. max_sector was initialized to 0, so min(max_sector, sh->dev[dd_idx].sector) will always be 0. Did I miss/misread something here? Thanks, Song > } > > spin_lock_irq(&conf->device_lock); >
Index: linux-2.6/drivers/md/raid5.c =================================================================== --- linux-2.6.orig/drivers/md/raid5.c +++ linux-2.6/drivers/md/raid5.c @@ -5851,7 +5851,7 @@ static bool stripe_ahead_of_reshape(stru continue; min_sector = min(min_sector, sh->dev[dd_idx].sector); - max_sector = max(max_sector, sh->dev[dd_idx].sector); + max_sector = min(max_sector, sh->dev[dd_idx].sector); } spin_lock_irq(&conf->device_lock);
Revert the commit c467e97f079f ("md/raid6: use valid sector values to determine if an I/O should wait on the reshape") - it causes deadlock in the LVM2 test shell/lvconvert-raid-reshape.sh sysrq: Show Blocked State task:(udev-worker) state:D stack:0 pid:98633 tgid:98633 ppid:320 flags:0x00000006 Call Trace: <TASK> __schedule+0x213/0x550 schedule+0x29/0xa0 schedule_timeout+0xbe/0xd0 ? __wake_up+0x3b/0x50 wait_woken+0x47/0x50 raid5_make_request+0x501/0x10e0 [raid456] ? swake_up_all+0xb0/0xb0 md_handle_request+0x132/0x1e0 [md_mod] raid_map+0x20/0x30 [dm_raid] __map_bio+0x179/0x1a0 [dm_mod] dm_submit_bio+0x166/0x4c0 [dm_mod] __submit_bio+0x78/0xf0 submit_bio_noacct_nocheck+0xb6/0x290 mpage_readahead+0xc7/0xe0 ? blkdev_iomap_begin+0x80/0x80 read_pages+0x42/0x1e0 page_cache_ra_unbounded+0x128/0x170 force_page_cache_ra+0x8c/0xb0 filemap_get_pages+0xf3/0x530 ? current_time+0x16/0xc0 filemap_read+0xb3/0x2b0 ? sgl_alloc_order+0xf0/0x1c0 ? dm_copy_name_and_uuid+0x6c/0x90 [dm_mod] ? dm_attr_uuid_show+0x1a/0x40 [dm_mod] ? do_wp_page+0x20c/0xaf0 ? dm_attr_show+0x32/0x50 [dm_mod] ? __pte_offset_map+0x12/0x170 blkdev_read_iter+0x62/0x140 vfs_read+0x1a9/0x2a0 ksys_read+0x4e/0xc0 do_syscall_64+0x3c/0x110 entry_SYSCALL_64_after_hwframe+0x46/0x4e </TASK> task:lvm state:D stack:0 pid:151667 tgid:151667 ppid:150522 flags:0x00000002 Call Trace: <TASK> __schedule+0x213/0x550 schedule+0x29/0xa0 schedule_timeout+0xbe/0xd0 ? queue_delayed_work_on+0x1b/0x30 ? srcu_gp_start_if_needed+0x33e/0x4a0 wait_for_completion+0x6d/0x110 __synchronize_srcu.part.0+0x6f/0x80 ? get_rcu_tasks_trace_gp_kthread+0x10/0x10 __dm_suspend+0x50/0x180 [dm_mod] ? table_deps+0x1b0/0x1b0 [dm_mod] dm_suspend+0xaf/0xd0 [dm_mod] dev_suspend+0x186/0x2d0 [dm_mod] ? table_deps+0x1b0/0x1b0 [dm_mod] ctl_ioctl+0x2e1/0x570 [dm_mod] dm_ctl_ioctl+0x5/0x10 [dm_mod] __x64_sys_ioctl+0x85/0xa0 do_syscall_64+0x3c/0x110 entry_SYSCALL_64_after_hwframe+0x46/0x4e </TASK> Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Fixes: c467e97f079f ("md/raid6: use valid sector values to determine if an I/O should wait on the reshape") Cc: stable@vger.kernel.org # v6.1+ --- drivers/md/raid5.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)