You can probably make this easier to trigger by putting a delay in the state
machine if the flag is set:
[fs/fscache/cookie.c]
+#include <linux/delay.h>
...
static void fscache_cookie_state_machine(struct fscache_cookie *cookie)
{
enum fscache_cookie_state state;
bool wake = false;
_enter("c=%x", cookie->debug_id);
again:
+ if (test_bit(FSCACHE_COOKIE_DO_LRU_DISCARD, &cookie->flags))
+ msleep(100);
again_locked:
state = cookie->state;
switch (state) {
David
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