linux-kernel - Re: linux-next: runtime warning after merge of the mm-unstable tree

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Message-ID: <5628676b-e1ff-4570-a1ee-c87742e5363c@oracle.com>
Date: Tue, 22 Apr 2025 11:05:10 -0700
From: Libo Chen <libo.chen@...cle.com>
To: Stephen Rothwell <sfr@...b.auug.org.au>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc: Steven Rostedt <rostedt@...dmis.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>
Subject: Re: linux-next: runtime warning after merge of the mm-unstable tree



On 4/22/25 03:57, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the mm-unstable tree, today's linux-next build
> (powerpcmpseries_le_defconfig) produced this warning:
> 
> [    0.000000][    T0] ------------[ cut here ]------------
> [    0.000000][    T0] WARNING: CPU: 0 PID: 0 at kernel/trace/trace_events.c:596 trace_event_raw_init+0x1b0/0x6d0
> [    0.000000][    T0] Modules linked in:
> [    0.000000][    T0] CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.15.0-rc3-05418-g16441530e08c #1 VOLUNTARY 
> [    0.000000][    T0] Hardware name: IBM pSeries (emulated by qemu) POWER10 (architected) 0x801200 0xf000006 of:SLOF,HEAD pSeries
> [    0.000000][    T0] NIP:  c0000000003efd30 LR: c0000000003f0140 CTR: 0000000000000000
> [    0.000000][    T0] REGS: c0000000028f7940 TRAP: 0700   Not tainted  (6.15.0-rc3-05418-g16441530e08c)
> [    0.000000][    T0] MSR:  8000000002021033 <SF,VEC,ME,IR,DR,RI,LE>  CR: 44000288  XER: 00000000
> [    0.000000][    T0] CFAR: c0000000003f0144 IRQMASK: 3 
> [    0.000000][    T0] GPR00: c0000000003f0140 c0000000028f7be0 c000000001811100 0000000000000000 
> [    0.000000][    T0] GPR04: 000000000000005b c000000001617716 0000000000000006 c0000000003efc7c 
> [    0.000000][    T0] GPR08: c0000000014dd6a8 ffffffffffffffff 000000000000005b 0000000000000000 
> [    0.000000][    T0] GPR12: c0000000003efb80 c000000002aa8000 0000000000000000 00000000019e40b8 
> [    0.000000][    T0] GPR16: 000000007e68eef8 0000000000000001 0000000002d500d0 00000000019e3f38 
> [    0.000000][    T0] GPR20: 0000000000000093 c000000002654c03 0000000000000000 0000000000000093 
> [    0.000000][    T0] GPR24: 0000000000000005 0000000000000000 0000000000000000 0000000000000020 
> [    0.000000][    T0] GPR28: 0000000000000000 c000000002656c68 c000000002654b70 00000000000000bb 
> [    0.000000][    T0] NIP [c0000000003efd30] trace_event_raw_init+0x1b0/0x6d0
> [    0.000000][    T0] LR [c0000000003f0140] trace_event_raw_init+0x5c0/0x6d0
> [    0.000000][    T0] Call Trace:
> [    0.000000][    T0] [c0000000028f7be0] [c0000000003f0140] trace_event_raw_init+0x5c0/0x6d0 (unreliable)
> [    0.000000][    T0] [c0000000028f7ca0] [c0000000003f2768] event_init+0x68/0x100
> [    0.000000][    T0] [c0000000028f7d10] [c00000000203e62c] trace_event_init+0xfc/0x4ac
> [    0.000000][    T0] [c0000000028f7e00] [c00000000203d4e0] trace_init+0x6c/0x680
> [    0.000000][    T0] [c0000000028f7f30] [c0000000020042f8] start_kernel+0x664/0x964
> [    0.000000][    T0] [c0000000028f7fe0] [c00000000000e99c] start_here_common+0x1c/0x20
> [    0.000000][    T0] Code: 72d60001 7c8407b4 7c7e1a14 41820430 4bfffca9 2c230000 41820010 3920fffe 7929c010 7f7b4838 2c3b0000 41820064 <0fe00000> 73690001 3be00001 40820014 
> [    0.000000][    T0] ---[ end trace 0000000000000000 ]---
> [    0.000000][    T0] event sched_skip_cpuset_numa has unsafe dereference of argument 6

Hi, Stephen,

Just to verify, does the build have commit 'tracing: Verify event formats that have "%*p.."'[1] or not? I do see linux-next/master has it but just want to first confirm that. 

Thanks,
Libo

[1]:https://lore.kernel.org/all/20250327195311.2d89ec66@gandalf.local.home/

> [    0.000000][    T0] print_fmt: "comm=%s pid=%d tgid=%d ngid=%d mem_nodes_allowed=%*pbl", REC->comm, REC->pid, REC->tgid, REC->ngid, __nodemask_pr_numnodes(REC->mem_allowed_ptr), __nodemask_pr_bits(REC->mem_allowed_ptr)
> 
> Introduced by commit
> 
>   516be5b3418e ("sched/numa: add tracepoint that tracks the skipping of numa balancing due to cpuset memory pinning")
>