Hello:
This patch was applied to bpf/bpf-next.git (refs/heads/master):
On Tue, 27 Oct 2020 23:10:54 -0700 you wrote:
> Commit e679654a704e ("bpf: Fix a rcu_sched stall issue with
> bpf task/task_file iterator") tries to fix rcu stalls warning
> which is caused by bpf task_file iterator when running
> "bpftool prog".
>
> rcu: INFO: rcu_sched self-detected stall on CPU
> rcu: \x097-....: (20999 ticks this GP) idle=302/1/0x4000000000000000 softirq=1508852/1508852 fqs=4913
> \x09(t=21031 jiffies g=2534773 q=179750)
> NMI backtrace for cpu 7
> CPU: 7 PID: 184195 Comm: bpftool Kdump: loaded Tainted: G W 5.8.0-00004-g68bfc7f8c1b4 #6
> Hardware name: Quanta Twin Lakes MP/Twin Lakes Passive MP, BIOS F09_3A17 05/03/2019
> Call Trace:
> <IRQ>
> dump_stack+0x57/0x70
> nmi_cpu_backtrace.cold+0x14/0x53
> ? lapic_can_unplug_cpu.cold+0x39/0x39
> nmi_trigger_cpumask_backtrace+0xb7/0xc7
> rcu_dump_cpu_stacks+0xa2/0xd0
> rcu_sched_clock_irq.cold+0x1ff/0x3d9
> ? tick_nohz_handler+0x100/0x100
> update_process_times+0x5b/0x90
> tick_sched_timer+0x5e/0xf0
> __hrtimer_run_queues+0x12a/0x2a0
> hrtimer_interrupt+0x10e/0x280
> __sysvec_apic_timer_interrupt+0x51/0xe0
> asm_call_on_stack+0xf/0x20
> </IRQ>
> sysvec_apic_timer_interrupt+0x6f/0x80
> ...
> task_file_seq_next+0x52/0xa0
> bpf_seq_read+0xb9/0x320
> vfs_read+0x9d/0x180
> ksys_read+0x5f/0xe0
> do_syscall_64+0x38/0x60
> entry_SYSCALL_64_after_hwframe+0x44/0xa9
>
> [...]
Here is the summary with links:
- [bpf-next] bpf: permit cond_resched for some iterators
https://git.kernel.org/bpf/bpf-next/c/cf83b2d2e2b6
You are awesome, thank you!
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