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Message-ID: <tencent_ED33039E0E1BA24BEE1B67250DBA58BBC408@qq.com>
Date: Sun, 11 Aug 2024 16:42:39 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+0b74d367d6e80661d6df@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [v9fs?] WARNING in v9fs_begin_writeback
debug
#syz test: upstream c0ecd6388360
diff --git a/fs/netfs/buffered_read.c b/fs/netfs/buffered_read.c
index a688d4c75d99..fab0714e1324 100644
--- a/fs/netfs/buffered_read.c
+++ b/fs/netfs/buffered_read.c
@@ -602,6 +602,7 @@ ssize_t netfs_buffered_read_iter(struct kiocb *iocb, struct iov_iter *iter)
test_bit(NETFS_ICTX_UNBUFFERED, &ictx->flags)))
return -EINVAL;
+ pr_info("ino: %lx, comm: %s, %s\n", inode->i_ino, current->comm, __func__);
ret = netfs_start_io_read(inode);
if (ret == 0) {
ret = filemap_read(iocb, iter, 0);
diff --git a/fs/netfs/buffered_write.c b/fs/netfs/buffered_write.c
index 4726c315453c..63d85b6421e9 100644
--- a/fs/netfs/buffered_write.c
+++ b/fs/netfs/buffered_write.c
@@ -192,6 +192,7 @@ ssize_t netfs_perform_write(struct kiocb *iocb, struct iov_iter *iter,
) {
wbc_attach_fdatawrite_inode(&wbc, mapping->host);
+ printk("ino: %lx, in state: %lu, comm: %s, %s\n", inode->i_ino, inode->i_state, current->comm, __func__);
ret = filemap_write_and_wait_range(mapping, pos, pos + iter->count);
if (ret < 0) {
wbc_detach_inode(&wbc);
@@ -510,6 +511,7 @@ ssize_t netfs_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
netfs_end_io_write(inode);
if (ret > 0)
ret = generic_write_sync(iocb, ret);
+ printk("ino: %lx, in state: %lu, comm: %s, %s\n", inode->i_ino, inode->i_state, current->comm, __func__);
return ret;
}
EXPORT_SYMBOL(netfs_file_write_iter);
@@ -555,6 +557,7 @@ vm_fault_t netfs_page_mkwrite(struct vm_fault *vmf, struct netfs_group *netfs_gr
group = netfs_folio_group(folio);
if (group != netfs_group && group != NETFS_FOLIO_COPY_TO_CACHE) {
folio_unlock(folio);
+ printk("ino: %lx, in state: %lu, comm: %s, %s\n", inode->i_ino, inode->i_state, current->comm, __func__);
err = filemap_fdatawrite_range(mapping,
folio_pos(folio),
folio_pos(folio) + folio_size(folio));
diff --git a/fs/netfs/direct_write.c b/fs/netfs/direct_write.c
index 88f2adfab75e..c19963e9627b 100644
--- a/fs/netfs/direct_write.c
+++ b/fs/netfs/direct_write.c
@@ -170,6 +170,7 @@ ssize_t netfs_unbuffered_write_iter(struct kiocb *iocb, struct iov_iter *from)
if (filemap_invalidate_inode(inode, true, pos, end))
goto out;
} else {
+ printk("ino: %lx, in state: %lu, comm: %s, %s\n", inode->i_ino, inode->i_state, current->comm, __func__);
ret = filemap_write_and_wait_range(mapping, pos, end);
if (ret < 0)
goto out;
diff --git a/fs/netfs/write_issue.c b/fs/netfs/write_issue.c
index 9258d30cffe3..106eb5b287e9 100644
--- a/fs/netfs/write_issue.c
+++ b/fs/netfs/write_issue.c
@@ -522,6 +522,8 @@ int netfs_writepages(struct address_space *mapping,
trace_netfs_write(wreq, netfs_write_trace_writeback);
netfs_stat(&netfs_n_wh_writepages);
+ printk("ino state: %lu, ino: %lx, comm: %s, folio: %p, %s\n", wreq->inode->i_state,
+ wreq->inode->i_ino, current->comm, folio, __func__);
do {
_debug("wbiter %lx %llx", folio->index, wreq->start + wreq->submitted);
diff --git a/mm/filemap.c b/mm/filemap.c
index d62150418b91..37229eeaf628 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -394,6 +394,7 @@ int filemap_fdatawrite_wbc(struct address_space *mapping,
return 0;
wbc_attach_fdatawrite_inode(wbc, mapping->host);
+ printk("ino: %lx, comm: %s, %s\n", mapping->host->i_ino, current->comm, __func__);
ret = do_writepages(mapping, wbc);
wbc_detach_inode(wbc);
return ret;
@@ -427,12 +428,14 @@ int __filemap_fdatawrite_range(struct address_space *mapping, loff_t start,
.range_end = end,
};
+ printk("ino: %lx, comm: %s, %s\n", mapping->host->i_ino, current->comm, __func__);
return filemap_fdatawrite_wbc(mapping, &wbc);
}
static inline int __filemap_fdatawrite(struct address_space *mapping,
int sync_mode)
{
+ printk("ino: %lx, comm: %s, %s\n", mapping->host->i_ino, current->comm, __func__);
return __filemap_fdatawrite_range(mapping, 0, LLONG_MAX, sync_mode);
}
@@ -445,6 +448,7 @@ EXPORT_SYMBOL(filemap_fdatawrite);
int filemap_fdatawrite_range(struct address_space *mapping, loff_t start,
loff_t end)
{
+ printk("ino: %lx, comm: %s, %s\n", mapping->host->i_ino, current->comm, __func__);
return __filemap_fdatawrite_range(mapping, start, end, WB_SYNC_ALL);
}
EXPORT_SYMBOL(filemap_fdatawrite_range);
@@ -682,6 +686,7 @@ int filemap_write_and_wait_range(struct address_space *mapping,
return 0;
if (mapping_needs_writeback(mapping)) {
+ printk("ino: %lx, comm: %s, %s\n", mapping->host->i_ino, current->comm, __func__);
err = __filemap_fdatawrite_range(mapping, lstart, lend,
WB_SYNC_ALL);
/*
@@ -785,6 +790,7 @@ int file_write_and_wait_range(struct file *file, loff_t lstart, loff_t lend)
return 0;
if (mapping_needs_writeback(mapping)) {
+ printk("ino: %lx, comm: %s, %s\n", mapping->host->i_ino, current->comm, __func__);
err = __filemap_fdatawrite_range(mapping, lstart, lend,
WB_SYNC_ALL);
/* See comment of filemap_write_and_wait() */
@@ -2708,6 +2714,7 @@ int kiocb_write_and_wait(struct kiocb *iocb, size_t count)
return 0;
}
+ printk("ino: %lx, comm: %s, %s\n", mapping->host->i_ino, current->comm, __func__);
return filemap_write_and_wait_range(mapping, pos, end);
}
EXPORT_SYMBOL_GPL(kiocb_write_and_wait);
@@ -2775,6 +2782,7 @@ generic_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
struct address_space *mapping = file->f_mapping;
struct inode *inode = mapping->host;
+ printk("ino: %lx, comm: %s, %s\n", mapping->host->i_ino, current->comm, __func__);
retval = kiocb_write_and_wait(iocb, count);
if (retval < 0)
return retval;
@@ -4227,6 +4235,7 @@ int filemap_invalidate_inode(struct inode *inode, bool flush,
.range_end = end,
};
+ printk("ino: %lx, comm: %s, %s\n", inode->i_ino, current->comm, __func__);
filemap_fdatawrite_wbc(mapping, &wbc);
}
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 4430ac68e4c4..f76ce90a5396 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -2687,6 +2687,7 @@ int do_writepages(struct address_space *mapping, struct writeback_control *wbc)
/* deal with chardevs and other special files */
ret = 0;
}
+ printk("ret: %d, ino: %lx, comm: %s, %s\n", ret, mapping->host->i_ino, current->comm, __func__);
if (ret != -ENOMEM || wbc->sync_mode != WB_SYNC_ALL)
break;
diff --git a/fs/9p/vfs_addr.c b/fs/9p/vfs_addr.c
index a97ceb105cd8..7768cc70439d 100644
--- a/fs/9p/vfs_addr.c
+++ b/fs/9p/vfs_addr.c
@@ -34,6 +34,7 @@ static void v9fs_begin_writeback(struct netfs_io_request *wreq)
{
struct p9_fid *fid;
+ printk("ino: %lx, %s\n", wreq->inode->i_ino, __func__);
fid = v9fs_fid_find_inode(wreq->inode, true, INVALID_UID, true);
if (!fid) {
WARN_ONCE(1, "folio expected an open fid inode->i_ino=%lx\n",
diff --git a/fs/9p/vfs_dir.c b/fs/9p/vfs_dir.c
index e0d34e4e9076..73cff02644b2 100644
--- a/fs/9p/vfs_dir.c
+++ b/fs/9p/vfs_dir.c
@@ -219,6 +219,7 @@ int v9fs_dir_release(struct inode *inode, struct file *filp)
retval = filemap_fdatawrite(inode->i_mapping);
spin_lock(&inode->i_lock);
+ printk("del, ino: %lx, ino sync: %d, comm: %s, %s\n", inode->i_ino, inode->i_state & I_SYNC, current->comm, __func__);
hlist_del(&fid->ilist);
spin_unlock(&inode->i_lock);
put_err = p9_fid_put(fid);
diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c
index 348cc90bf9c5..a3c32b7de2f5 100644
--- a/fs/9p/vfs_file.c
+++ b/fs/9p/vfs_file.c
@@ -44,6 +44,7 @@ int v9fs_file_open(struct inode *inode, struct file *file)
struct p9_fid *fid;
int omode;
+ pr_info("ino: %lx, %s\n", inode->i_ino, __func__);
p9_debug(P9_DEBUG_VFS, "inode: %p file: %p\n", inode, file);
v9ses = v9fs_inode2v9ses(inode);
if (v9fs_proto_dotl(v9ses))
@@ -461,6 +462,7 @@ v9fs_file_mmap(struct file *filp, struct vm_area_struct *vma)
struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
p9_debug(P9_DEBUG_MMAP, "filp :%p\n", filp);
+ pr_info("ino: %lx, comm: %s, %s\n", inode->i_ino, current->comm, __func__);
if (!(v9ses->cache & CACHE_WRITEBACK)) {
p9_debug(P9_DEBUG_CACHE, "(read-only mmap mode)");
@@ -477,6 +479,7 @@ v9fs_file_mmap(struct file *filp, struct vm_area_struct *vma)
static vm_fault_t
v9fs_vm_page_mkwrite(struct vm_fault *vmf)
{
+ printk("comm: %s, %s\n", current->comm, __func__);
return netfs_page_mkwrite(vmf, NULL);
}
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