From: Chao Yu <yuchao0@huawei.com>
To: <jaegeuk@kernel.org>
Cc: <linux-f2fs-devel@lists.sourceforge.net>,
<linux-kernel@vger.kernel.org>, <chao@kernel.org>,
Chao Yu <yuchao0@huawei.com>
Subject: [PATCH] f2fs: fix to avoid discard command leak
Date: Fri, 19 Jul 2019 15:18:44 +0800 [thread overview]
Message-ID: <20190719071844.5690-1-yuchao0@huawei.com> (raw)
=============================================================================
BUG discard_cmd (Tainted: G B OE ): Objects remaining in discard_cmd on __kmem_cache_shutdown()
-----------------------------------------------------------------------------
INFO: Slab 0xffffe1ac481d22c0 objects=36 used=2 fp=0xffff936b4748bf50 flags=0x2ffff0000000100
Call Trace:
dump_stack+0x63/0x87
slab_err+0xa1/0xb0
__kmem_cache_shutdown+0x183/0x390
shutdown_cache+0x14/0x110
kmem_cache_destroy+0x195/0x1c0
f2fs_destroy_segment_manager_caches+0x21/0x40 [f2fs]
exit_f2fs_fs+0x35/0x641 [f2fs]
SyS_delete_module+0x155/0x230
? vtime_user_exit+0x29/0x70
do_syscall_64+0x6e/0x160
entry_SYSCALL64_slow_path+0x25/0x25
INFO: Object 0xffff936b4748b000 @offset=0
INFO: Object 0xffff936b4748b070 @offset=112
kmem_cache_destroy discard_cmd: Slab cache still has objects
Call Trace:
dump_stack+0x63/0x87
kmem_cache_destroy+0x1b4/0x1c0
f2fs_destroy_segment_manager_caches+0x21/0x40 [f2fs]
exit_f2fs_fs+0x35/0x641 [f2fs]
SyS_delete_module+0x155/0x230
do_syscall_64+0x6e/0x160
entry_SYSCALL64_slow_path+0x25/0x25
Recovery can cache discard commands, so in error path of fill_super(),
we need give a chance to handle them, otherwise it will lead to leak
of discard_cmd slab cache.
Signed-off-by: Chao Yu <yuchao0@huawei.com>
---
fs/f2fs/segment.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 57a83a68ae03..449ef70d99cc 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2084,6 +2084,13 @@ static void destroy_discard_cmd_control(struct f2fs_sb_info *sbi)
f2fs_stop_discard_thread(sbi);
+ /*
+ * Recovery can cache discard commands, so in error path of
+ * fill_super(), it needs to give a chance to handle them.
+ */
+ if (unlikely(atomic_read(&dcc->discard_cmd_cnt)))
+ f2fs_issue_discard_timeout(sbi);
+
kvfree(dcc);
SM_I(sbi)->dcc_info = NULL;
}
--
2.18.0.rc1
reply other threads:[~2019-07-19 7:19 UTC|newest]
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