Isn't there race issue during fput() and the dentry_open()?
When booting kernel, the following deadlocks are experienced.
Stack traceback for pid 2130
0xf717f1b0 2130 1 1 0 R 0xf717f400 *irqbalance
ESP EIP Function (args)
0xf75bfe38 0xc02d04b2 _spin_lock+0x2e (0xf7441a80)
0xf75bff34 0xc015667c file_move+0x14 (0xf63080e4, 0xf75bff58, 0x0, 0xf74bf000)
0xf75bff40 0xc0154e37 dentry_open+0xb9 (0xf63080e4, 0xf7f5ad80, 0xc02d00e6, 0x100100, 0x246)
0xf75bff58 0xc0154d78 filp_open+0x36
0xf75bffb4 0xc0155079 sys_open+0x31
0xf75bffc4 0xc02d196f syscall_call+0x7
The patch was made. Is this patch right?
diff -urN linux-2.6.12-rc1.orig/fs/file_table.c linux-2.6.12-rc1/fs/file_table.c
--- linux-2.6.12-rc1.orig/fs/file_table.c 2005-03-02 16:37:47.000000000 +0900
+++ linux-2.6.12-rc1/fs/file_table.c 2005-03-31 17:50:46.323999320 +0900
@@ -209,11 +209,11 @@
void file_kill(struct file *file)
{
+ file_list_lock();
if (!list_empty(&file->f_list)) {
- file_list_lock();
list_del_init(&file->f_list);
- file_list_unlock();
}
+ file_list_unlock();
}
int fs_may_remount_ro(struct super_block *sb)
--
Haruo
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