The patch titled
Subject: fs/buffer.c: dump more info for __getblk_gfp() stall problem
has been added to the -mm tree. Its filename is
info-task-hung-in-generic_file_write-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/info-task-hung-in-generic_file_write-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/info-task-hung-in-generic_file_write-fix.patch
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------------------------------------------------------
From: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Subject: fs/buffer.c: dump more info for __getblk_gfp() stall problem
We need to dump more variables on top of
"fs/buffer.c: add debug print for __getblk_gfp() stall problem".
Link: http://lkml.kernel.org/r/12239545-7d8a-820f-48ba-952e2e98a05c@xxxxxxxxxxxxxxxxxxx
Signed-off-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/buffer.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
--- a/fs/buffer.c~info-task-hung-in-generic_file_write-fix
+++ a/fs/buffer.c
@@ -1066,9 +1066,15 @@ __getblk_slow(struct block_device *bdev,
#ifdef CONFIG_DEBUG_AID_FOR_SYZBOT
if (!time_after(jiffies, current->getblk_stamp + 3 * HZ))
continue;
- printk(KERN_ERR "%s(%u): getblk(): executed=%x bh_count=%d bh_state=%lx\n",
+ printk(KERN_ERR "%s(%u): getblk(): executed=%x bh_count=%d bh_state=%lx bdev_super_blocksize=%ld size=%u bdev_super_blocksize_bits=%d bdev_inode_blkbits=%d\n",
current->comm, current->pid, current->getblk_executed,
- current->getblk_bh_count, current->getblk_bh_state);
+ current->getblk_bh_count, current->getblk_bh_state,
+ IS_ERR_OR_NULL(bdev->bd_super) ? -1L :
+ bdev->bd_super->s_blocksize, size,
+ IS_ERR_OR_NULL(bdev->bd_super) ? -1 :
+ bdev->bd_super->s_blocksize_bits,
+ IS_ERR_OR_NULL(bdev->bd_inode) ? -1 :
+ bdev->bd_inode->i_blkbits);
current->getblk_executed = 0;
current->getblk_bh_count = 0;
current->getblk_bh_state = 0;
_
Patches currently in -mm which might be from penguin-kernel@xxxxxxxxxxxxxxxxxxx are
info-task-hung-in-generic_file_write_iter.patch
info-task-hung-in-generic_file_write-fix.patch
kernel-hung_taskc-break-rcu-locks-based-on-jiffies.patch
