linux-kernel - next-20250604: qemu-riscv64 ltp tracing warning kernel trace trace.c ignore

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Message-ID: <CA+G9fYuXxxPG7YY4ffbJ=hrBvBU4171J_FykYC2xoPV6uUB2sg@mail.gmail.com>
Date: Thu, 5 Jun 2025 18:24:08 +0530
From: Naresh Kamboju <naresh.kamboju@...aro.org>
To: open list <linux-kernel@...r.kernel.org>, 
	Linux trace kernel <linux-trace-kernel@...r.kernel.org>, lkft-triage@...ts.linaro.org, 
	Linux Regressions <regressions@...ts.linux.dev>
Cc: Stephen Rothwell <sfr@...b.auug.org.au>, Masami Hiramatsu <mhiramat@...nel.org>, 
	Arnd Bergmann <arnd@...db.de>, Dan Carpenter <dan.carpenter@...aro.org>, 
	Anders Roxell <anders.roxell@...aro.org>
Subject: next-20250604: qemu-riscv64 ltp tracing warning kernel trace trace.c ignore_event

Regression while running LTP tracing on the Linux next-20250604 and
next-20250605
the following kernel warnings found on the qemu-riscv64.

Regressions found on qemu-riscv64
 - LTP tracing

Regression Analysis:
 - New regression? Yes
 - Reproducibility? Yes

First seen on the next-20250604
Good: next-20250603
Bad:  next-20250604

Test regression: qemu-riscv64 ltp tracing warning kernel trace trace.c
ignore_event

Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>

## Test error

------------[ cut here ]------------
[   28.134981] event 'ma_read' has unsafe pointer field 'fn'
[   28.135550] WARNING: CPU: 1 PID: 302 at kernel/trace/trace.c:3823
ignore_event+0x1de/0x1fa
[   28.135609] Modules linked in: drm drm_panel_orientation_quirks
backlight configfs ip_tables x_tables
[   28.135937] CPU: 1 UID: 0 PID: 302 Comm: cat Not tainted
6.15.0-next-20250604 #1 NONE
[   28.135973] Hardware name: riscv-virtio,qemu (DT)
[   28.136072] epc : ignore_event+0x1de/0x1fa
[   28.136115]  ra : ignore_event+0x1de/0x1fa
[   28.136147] epc : ffffffff80151ca4 ra : ffffffff80151ca4 sp :
ff200000006ebbe0
[   28.136164]  gp : ffffffff81c61428 tp : ff60000084efd100 t0 :
ff200000006eb9b8
[   28.136181]  t1 : ffffffffffffe000 t2 : 205b2d2d2d2d2d2d s0 :
ff200000006ebc50
[   28.136197]  s1 : ff60000080066150 a0 : 000000000000002d a1 :
ff6000008103e730
[   28.136213]  a2 : ff600000fffcd980 a3 : ffffffff80104e22 a4 :
0000000000000000
[   28.136229]  a5 : 0000000000000000 a6 : 000000000000003a a7 :
0000000000000a00
[   28.136245]  s2 : ffffffff81801608 s3 : ff60000087cd8078 s4 :
ffffffff81bebe70
[   28.136262]  s5 : ff60000087cda090 s6 : ff60000087cda054 s7 :
ff60000087f9ea40
[   28.136278]  s8 : ffffffff81200000 s9 : ffffffff81800000 s10:
ffffffff81bfa290
[   28.136294]  s11: ff60000087cdc000 t3 : ffffffff81c615d8 t4 :
ffffffff8001f8e0
[   28.136321]  t5 : ffffffff8014156c t6 : ff200000006eb9b8
[   28.136337] status: 0000000200000120 badaddr: ffffffff80151ca4
cause: 0000000000000003
[   28.136395] [<ffffffff80151ca4>] ignore_event+0x1de/0x1fa
[   28.136456] [<ffffffff80157548>] trace_event_printf+0x46/0x88
[   28.136471] [<ffffffff80d2d54c>] trace_raw_output_ma_read+0x5e/0x7a
[   28.136489] [<ffffffff801530f6>] print_trace_line+0x1c2/0x438
[   28.136506] [<ffffffff80153948>] tracing_read_pipe+0x1a2/0x2ee
[   28.136522] [<ffffffff802f3eb8>] vfs_read+0xb0/0x294
[   28.136538] [<ffffffff802f48ac>] ksys_read+0x78/0xde
[   28.136554] [<ffffffff802f4934>] __riscv_sys_read+0x22/0x2c
[   28.136569] [<ffffffff80d49cd8>] do_trap_ecall_u+0x1ba/0x392
[   28.136584] [<ffffffff80d56b6e>] handle_exception+0x146/0x152
[   28.136654] ---[ end trace 0000000000000000 ]---

## Source
* Kernel version: 6.15.0-next-20250605 and 6.15.0-next-20250604
* Git tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next.git
* Git sha: 4f27f06ec12190c7c62c722e99ab6243dea81a94
* Toolchain: gcc-13

## Build
* Test log: https://qa-reports.linaro.org/api/testruns/28662756/log_file/
* Build link: https://storage.tuxsuite.com/public/linaro/lkft/builds/2y1tW4N08hDuUrUZt7mmMMyQJag/
* Kernel config:
https://storage.tuxsuite.com/public/linaro/lkft/builds/2y1tW4N08hDuUrUZt7mmMMyQJag/config

--
Linaro LKFT
https://lkft.linaro.org