Hi Nadav, Thanks for the comments. I'll test the 3 patches in the mentioned thread.
Thanks, Joseph On 19/6/8 00:38, Nadav Amit wrote: >> On Jun 7, 2019, at 3:24 AM, Joseph Qi <joseph...@linux.alibaba.com> wrote: >> >> Hi all, >> Any idea on this regression? > > Sorry for the late response (I assumed, for some reason, that you also follow > the second thread about this issue). > > Anyhow, it should be fixed by backporting some patches which were mistakenly > missed. > > See https://lore.kernel.org/stable/20190606131558.GJ29739@sasha-vm/ > > Regards, > Nadav > > >> Thanks, >> Joseph >> >> On 19/6/5 18:23, Joseph Qi wrote: >>> Hi, >>> >>> I have encountered a kernel BUG when running ltp ftrace-stress-test >>> on 4.19.48. >>> >>> [ 209.704855] LTP: starting ftrace-stress-test (ftrace_stress_test.sh 90) >>> [ 209.739412] Scheduler tracepoints stat_sleep, stat_iowait, stat_blocked >>> and stat_runtime require the kernel parameter schedstats=enable or >>> kernel.sched_schedstats=1 >>> [ 212.054506] kernel tried to execute NX-protected page - exploit attempt? >>> (uid: 0) >>> [ 212.055595] BUG: unable to handle kernel paging request at >>> ffffffffc0349000 >>> [ 212.056589] PGD d00c067 P4D d00c067 PUD d00e067 PMD 23673e067 PTE >>> 800000023457f061 >>> [ 212.057759] Oops: 0011 [#1] SMP PTI >>> [ 212.058303] CPU: 0 PID: 0 Comm: swapper/0 Kdump: loaded Not tainted >>> 4.19.48 #112 >>> >>> After some investigation I have found that it is introduced by commit >>> 8715ce033eb3 ("x86/modules: Avoid breaking W^X while loading modules"), >>> and then revert this commit the issue is gone. >>> >>> I have also tested the same case on 5.2-rc3 as well as right at >>> upstream commit f2c65fb3221a ("x86/modules: Avoid breaking W^X while >>> loading modules"), which has been merged in 5.2-rc1, it doesn't >>> happen. >>> >>> So I don't know why only stable has this issue while upstream doesn't. >>> >>> Thanks, >>> Joseph >
