> I haven't got the first email, is it "kernel NULL pointer dereference" > as in the subject or just freeze? that's weird..probably the size of the attached log file is too big... here dmesg log file https://gist.github.com/1Jo1/3d0bcefc18f097265f0dc1ef054a87c0 > - did you locate which test hangs it? If so what it uses? e.g. SQPOLL > sharing, IOPOLL., etc. yes, it uses SQPOLL, without sharing, IPOLL is not enabled, and Async Flag is enabled > - is it send/recvmsg, send/recv you use? any other? no the tests which occurs the error use these operations: OP_READ, OP_WRITE, OP_POLL_ADD, OP_POLL_REMOVE, OP_CLOSE, OP_ACCEPT, OP_TIMEOUT (OP_READ, OP_WRITE and OP_CLOSE async flag is enabled) > - does this happen often? yeah quite often > - you may try `funcgraph __io_sq_thread -H` or even with `io_sq_thread` > (funcgraph is from bpftools). Or catch that with some other tools. I'm not quite familiar with these tools( kernel debugging in general) I'll take a look tomorrow ernel NULL pointer dereference" > as in the subject or just freeze? > > also > - anything in dmesg? (>5 min after freeze) > - did you locate which test hangs it? If so what it uses? e.g. SQPOLL > sharing, IOPOLL., etc. > - is it send/recvmsg, send/recv you use? any other? > - does this happen often? > - you may try `funcgraph __io_sq_thread -H` or even with `io_sq_thread` > (funcgraph is from bpftools). Or catch that with some other tools. > > -- > Pavel Begunkov
