Date: Mon, 22 May 2017 21:27:57 -0700 From: Kees Cook <keescook@...omium.org> To: Shubham Bansal <illusionist.neo@...il.com> Cc: Daniel Borkmann <daniel@...earbox.net>, David Miller <davem@...emloft.net>, Mircea Gherzan <mgherzan@...il.com>, Network Development <netdev@...r.kernel.org>, "kernel-hardening@...ts.openwall.com" <kernel-hardening@...ts.openwall.com>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, ast@...com Subject: Re: arch: arm: bpf: Converting cBPF to eBPF for arm 32 bit On Mon, May 22, 2017 at 7:58 PM, Shubham Bansal <illusionist.neo@...il.com> wrote: > On testing the eBPF JIT with CONFIG_FRAME_POINTER I got the following > crash for non jitted testcase. It's just a softlockup WARN, not a crash, and I think it'd to be expected given the large runtime test_bpf reports: > [ 72.032494] test_bpf: #267 BPF_MAXINSNS: Call heavy transformations > jited:0 1112799 > [ 92.304815] NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s! > [insmod:104] > ... > [ 93.835343] 1065840 PASS https://www.kernel.org/doc/Documentation/lockup-watchdogs.txt You can raise the softlockup time-out by changing the number of seconds here: /proc/sys/kernel/watchdog_thresh I think the softlockup is counting the entire runtime of the bpf_tests run, so if it takes 30 seconds to run, put at least 15 into /proc/sys/kernel/watchdog_thresh -Kees -- Kees Cook Pixel Security
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