Hello:
This patch was applied to bpf/bpf-next.git (master)
by Alexei Starovoitov <ast@xxxxxxxxxx>:
On Fri, 16 Sep 2022 09:19:14 +0200 you wrote:
> We got report from sysbot [1] about warnings that were caused by
> bpf program attached to contention_begin raw tracepoint triggering
> the same tracepoint by using bpf_trace_printk helper that takes
> trace_printk_lock lock.
>
> Call Trace:
> <TASK>
> ? trace_event_raw_event_bpf_trace_printk+0x5f/0x90
> bpf_trace_printk+0x2b/0xe0
> bpf_prog_a9aec6167c091eef_prog+0x1f/0x24
> bpf_trace_run2+0x26/0x90
> native_queued_spin_lock_slowpath+0x1c6/0x2b0
> _raw_spin_lock_irqsave+0x44/0x50
> bpf_trace_printk+0x3f/0xe0
> bpf_prog_a9aec6167c091eef_prog+0x1f/0x24
> bpf_trace_run2+0x26/0x90
> native_queued_spin_lock_slowpath+0x1c6/0x2b0
> _raw_spin_lock_irqsave+0x44/0x50
> bpf_trace_printk+0x3f/0xe0
> bpf_prog_a9aec6167c091eef_prog+0x1f/0x24
> bpf_trace_run2+0x26/0x90
> native_queued_spin_lock_slowpath+0x1c6/0x2b0
> _raw_spin_lock_irqsave+0x44/0x50
> bpf_trace_printk+0x3f/0xe0
> bpf_prog_a9aec6167c091eef_prog+0x1f/0x24
> bpf_trace_run2+0x26/0x90
> native_queued_spin_lock_slowpath+0x1c6/0x2b0
> _raw_spin_lock_irqsave+0x44/0x50
> __unfreeze_partials+0x5b/0x160
> ...
>
> [...]
Here is the summary with links:
- [PATCHv2,bpf-next] bpf: Prevent bpf program recursion for raw tracepoint probes
https://git.kernel.org/bpf/bpf-next/c/05b24ff9b2cf
You are awesome, thank you!
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