On 2019/01/03 2:06, Tetsuo Handa wrote: > On 2018/12/31 17:24, Dmitry Vyukov wrote: >>>> Since this involves OOMs and looks like a one-off induced memory corruption: >>>> >>>> #syz dup: kernel panic: corrupted stack end in wb_workfn >>>> >>> >>> Why? >>> >>> RCU stall in this case is likely to be latency caused by flooding of printk(). >> >> Just a hypothesis. OOMs lead to arbitrary memory corruptions, so can >> cause stalls as well. But can be what you said too. I just thought >> that cleaner dashboard is more useful than a large assorted pile of >> crashes. If you think it's actionable in some way, feel free to undup. >> > > We don't know why bpf tree is hitting this problem. > Let's continue monitoring this problem. > > #syz undup > A report at 2019/01/05 10:08 from "no output from test machine (2)" ( https://syzkaller.appspot.com/text?tag=CrashLog&x=1700726f400000 ) says that there are flood of memory allocation failure messages. Since continuous memory allocation failure messages itself is not recognized as a crash, we might be misunderstanding that this problem is not occurring recently. It will be nice if we can run testcases which are executed on bpf-next tree.
