Re: [syzbot] [jfs?] INFO: task hung in txBegin

[Edward Adam Davis]

with sb rwsem lock to order syncfs and wb worker

#syz test: upstream 50736169ecc8

diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index b865a3fa52f3..172ca9e1eed5 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -1865,6 +1865,7 @@ static long writeback_sb_inodes(struct super_block *sb,
 	long total_wrote = 0;  /* count both pages and inodes */
 	unsigned long dirtied_before = jiffies;
 
+	printk("path1, sb: %p, %s\n", sb, __func__);
 	if (work->for_kupdate)
 		dirtied_before = jiffies -
 			msecs_to_jiffies(dirty_expire_interval * 10);
@@ -1993,6 +1994,7 @@ static long writeback_sb_inodes(struct super_block *sb,
 				break;
 		}
 	}
+	printk("path1,end sb: %p, total_wrote:%lu, %s\n", sb, total_wrote, __func__);
 	return total_wrote;
 }
 
@@ -2720,6 +2722,7 @@ void writeback_inodes_sb_nr(struct super_block *sb,
 			    unsigned long nr,
 			    enum wb_reason reason)
 {
+	printk("path2: nr: %lu, sb: %p, %s\n", nr, sb, __func__);
 	__writeback_inodes_sb_nr(sb, nr, reason, false);
 }
 EXPORT_SYMBOL(writeback_inodes_sb_nr);