Huang Jianan 77d9c2efa8 erofs: fix deadlock when shrink erofs slab ... [ Upstream commit 57bbeacdbe ] We observed the following deadlock in the stress test under low memory scenario: Thread A Thread B - erofs_shrink_scan - erofs_try_to_release_workgroup - erofs_workgroup_try_to_freeze -- A - z_erofs_do_read_page - z_erofs_collection_begin - z_erofs_register_collection - erofs_insert_workgroup - xa_lock(&sbi->managed_pslots) -- B - erofs_workgroup_get - erofs_wait_on_workgroup_freezed -- A - xa_erase - xa_lock(&sbi->managed_pslots) -- B To fix this, it needs to hold xa_lock before freezing the workgroup since xarray will be touched then. So let's hold the lock before accessing each workgroup, just like what we did with the radix tree before. [ Gao Xiang: Jianhua Hao also reports this issue at https://lore.kernel.org/r/b10b85df30694bac8aadfe43537c897a@xiaomi.com ] Link: https://lore.kernel.org/r/20211118135844.3559-1-huangjianan@oppo.com Fixes: 64094a0441 ("erofs: convert workstn to XArray") Reviewed-by: Chao Yu <chao@kernel.org> Reviewed-by: Gao Xiang <hsiangkao@linux.alibaba.com> Signed-off-by: Huang Jianan <huangjianan@oppo.com> Reported-by: Jianhua Hao <haojianhua1@xiaomi.com> Signed-off-by: Gao Xiang <xiang@kernel.org> Signed-off-by: Sasha Levin <sashal@kernel.org>		2021-12-01 09:19:05 +01:00
..
compress.h
data.c
decompressor.c
dir.c
erofs_fs.h
inode.c
internal.h
Kconfig
Makefile
namei.c
super.c
tagptr.h
utils.c	erofs: fix deadlock when shrink erofs slab	2021-12-01 09:19:05 +01:00
xattr.c
xattr.h
zdata.c	erofs: fix unsafe pagevec reuse of hooked pclusters	2021-11-21 13:46:37 +01:00
zdata.h
zmap.c
zpvec.h	erofs: fix unsafe pagevec reuse of hooked pclusters	2021-11-21 13:46:37 +01:00