Am Mittwoch, 11. April 2018, 14:29:45 CEST schrieb Dmitry Vyukov: Hi Dmitry, > > What do you mean by description of the fault? > It's kernel standard FAULT_INJECTION facility, it injects faults > mainly into kmalloc/slab_alloc (also in a bunch of other things, but > in this case this seems to be kmalloc). In the repro you can see that > it's injecting a fault into 8-th malloc in the setsockopt syscall. I am now able to reproduce it. I think I have a smoking gun, but let me test it first. Ciao Stephan