Tetsuo Handa wrote: > Johannes Weiner wrote: > > On Fri, Sep 15, 2017 at 05:58:49PM +0800, wang Yu wrote: > > > From: "yuwang.yuwang" <yuwang.yuwang@xxxxxxxxxxxxxxx> > > > > > > I found a softlockup when running some stress testcase in 4.9.x, > > > but i think the mainline have the same problem. > > > > > > call trace: > > > [365724.502896] NMI watchdog: BUG: soft lockup - CPU#31 stuck for 22s! > > > [jbd2/sda3-8:1164] > > > > We've started seeing the same thing on 4.11. Tons and tons of > > allocation stall warnings followed by the soft lock-ups. > > Forgot to comment. Since you are able to reproduce the problem (aren't you?), > please try setting 1 to /proc/sys/kernel/softlockup_all_cpu_backtrace so that > we can know what other CPUs are doing. It does not need to patch kernels. > Johannes, were you able to reproduce the problem? I'd like to continue warn_alloc() serialization patch if you can confirm that uncontrolled flooding of allocation stall warning can lead to soft lockups. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
