On 2019-12-02 10:36:54 [-0500], Paul Thomas wrote: > On Fri, Nov 29, 2019 at 11:48 AM Sebastian Andrzej Siewior > <bigeasy@xxxxxxxxxxxxx> wrote: > > > > On 2019-11-12 17:42:42 [-0500], Paul Thomas wrote: > > > Any thoughts would be appreciated. > > > > Could please enable CONFIG_DEBUG_ATOMIC_SLEEP and check if the kernel > > complains? > > Hi Sebastian, > > Well, it does complain (report below), but I'm not sure it's related. > The other thing I tried was the AF_XDP example here: > https://github.com/xdp-project/xdp-tutorial/tree/master/advanced03-AF_XDP > > With this example poll() always seems to block correctly, so I think > maybe there is something wrong with the xdpsock_user.c example or how > I'm using it. > > [ 259.591480] BUG: assuming atomic context at net/core/ptp_classifier.c:106 > [ 259.591488] in_atomic(): 0, irqs_disabled(): 0, pid: 953, name: irq/22-eth%d > [ 259.591494] CPU: 0 PID: 953 Comm: irq/22-eth%d Tainted: G WC > 5. > > 2.21-rt13-00016-g93898e751d0e #90 > [ 259.591499] Hardware name: Enclustra XU5 SOM (DT) > [ 259.591501] Call trace: > [ 259.591503] dump_backtrace (/arch/arm64/kernel/traps.c:94) > [ 259.591514] show_stack (/arch/arm64/kernel/traps.c:151) > [ 259.591520] dump_stack (/lib/dump_stack.c:115) > [ 259.591526] __cant_sleep (/kernel/sched/core.c:6386) > [ 259.591531] ptp_classify_raw (/./include/linux/compiler.h:194 Is this the only splat? Nothing more? I would expect something at boot time, too. So this part expects disabled preemption. Other invocations disable preemption. The whole BPF part is currently not working on -RT. Sebastian
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