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Message-ID: <202508281655.54c87330-lkp@intel.com>
Date: Thu, 28 Aug 2025 16:43:07 +0800
From: kernel test robot <oliver.sang@...el.com>
To: Menglong Dong <menglong8.dong@...il.com>
CC: <oe-lkp@...ts.linux.dev>, <lkp@...el.com>, Masami Hiramatsu
<mhiramat@...nel.org>, Menglong Dong <dongml2@...natelecom.cn>,
<linux-kernel@...r.kernel.org>, <linux-trace-kernel@...r.kernel.org>,
<oliver.sang@...el.com>
Subject: [linux-next:master] [tracing] dfe0d675df:
WARNING:suspicious_RCU_usage
Hello,
kernel test robot noticed "WARNING:suspicious_RCU_usage" on:
commit: dfe0d675df82fb9297ff98253b9c3042fdab5544 ("tracing: fprobe: use rhltable for fprobe_ip_table")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
[test failed on linux-next/master d0630b758e593506126e8eda6c3d56097d1847c5]
in testcase: kernel-selftests-bpf
version:
with following parameters:
group: ftrace
config: x86_64-rhel-9.4-bpf
compiler: gcc-12
test machine: 4 threads Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz (Skylake) with 32G memory
(please refer to attached dmesg/kmsg for entire log/backtrace)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@...el.com>
| Closes: https://lore.kernel.org/oe-lkp/202508281655.54c87330-lkp@intel.com
[ 354.896751][ T4652] =============================
[ 354.901528][ T4652] WARNING: suspicious RCU usage
[ 354.906255][ T4652] 6.17.0-rc1-00001-gdfe0d675df82 #1 Tainted: G S I
[ 354.913924][ T4652] -----------------------------
[ 354.918654][ T4652] include/linux/rhashtable.h:602 suspicious rcu_dereference_check() usage!
[ 354.927114][ T4652]
[ 354.927114][ T4652] other info that might help us debug this:
[ 354.927114][ T4652]
[ 354.937180][ T4652]
[ 354.937180][ T4652] rcu_scheduler_active = 2, debug_locks = 1
[ 354.945106][ T4652] no locks held by ftracetest/4652.
[ 354.950167][ T4652]
[ 354.950167][ T4652] stack backtrace:
[ 354.955924][ T4652] CPU: 1 UID: 0 PID: 4652 Comm: ftracetest Tainted: G S I 6.17.0-rc1-00001-gdfe0d675df82 #1 PREEMPT(voluntary)
[ 354.955948][ T4652] Tainted: [S]=CPU_OUT_OF_SPEC, [I]=FIRMWARE_WORKAROUND
[ 354.955950][ T4652] Hardware name: Dell Inc. OptiPlex 7040/0Y7WYT, BIOS 1.1.1 10/07/2015
[ 354.955966][ T4652] Call Trace:
[ 354.955968][ T4652] <TASK>
[ 354.955971][ T4652] dump_stack_lvl+0x7c/0x90
[ 354.955978][ T4652] lockdep_rcu_suspicious+0x14f/0x1c0
[ 354.955987][ T4652] __rhashtable_lookup+0x1e0/0x260
[ 354.955994][ T4652] ? __pfx_kernel_clone+0x10/0x10
[ 354.956000][ T4652] fprobe_entry+0x9a/0x450
[ 354.956017][ T4652] ? __lock_acquire+0x6b0/0xca0
[ 354.956022][ T4652] ? find_held_lock+0x2b/0x80
[ 354.956041][ T4652] ? __pfx_fprobe_entry+0x10/0x10
[ 354.956045][ T4652] ? __pfx_kernel_clone+0x10/0x10
[ 354.956049][ T4652] ? lock_acquire+0x14c/0x2d0
[ 354.956053][ T4652] ? __might_fault+0x74/0xc0
[ 354.956063][ T4652] function_graph_enter_regs+0x2a0/0x550
[ 354.956067][ T4652] ? __do_sys_clone+0xb5/0x100
[ 354.956076][ T4652] ? __pfx_function_graph_enter_regs+0x10/0x10
[ 354.956080][ T4652] ? _copy_to_user+0x58/0x70
[ 354.956084][ T4652] ? __pfx_kernel_clone+0x10/0x10
[ 354.956088][ T4652] ? __x64_sys_rt_sigprocmask+0x114/0x180
[ 354.956093][ T4652] ? __pfx___x64_sys_rt_sigprocmask+0x10/0x10
[ 354.956099][ T4652] ? __pfx_kernel_clone+0x10/0x10
[ 354.956103][ T4652] ftrace_graph_func+0x87/0xb0
[ 354.956110][ T4652] 0xffffffffc0547095
[ 354.956118][ T4652] ? __pfx_handle_pte_fault+0x10/0x10
[ 354.956126][ T4652] ? kernel_clone+0x5/0x560
[ 354.956132][ T4652] kernel_clone+0x5/0x560
[ 354.956136][ T4652] __do_sys_clone+0xb5/0x100
[ 354.956140][ T4652] ? __pfx___do_sys_clone+0x10/0x10
[ 354.956154][ T4652] ? __might_fault+0x74/0xc0
[ 354.956159][ T4652] ? tracer_hardirqs_on+0x61/0x170
[ 354.956166][ T4652] ? __x64_sys_clone+0x4d/0x70
[ 354.956172][ T4652] do_syscall_64+0x8c/0x390
[ 354.956177][ T4652] ? __pfx___x64_sys_rt_sigprocmask+0x10/0x10
[ 354.956181][ T4652] ? handle_mm_fault+0x198/0x540
[ 354.956186][ T4652] ? exc_page_fault+0x57/0xb0
[ 354.956192][ T4652] ? lock_release+0x6c/0x130
[ 354.956196][ T4652] ? tracer_hardirqs_on+0x61/0x170
[ 354.956201][ T4652] ? do_user_addr_fault+0x400/0x730
[ 354.956209][ T4652] ? do_syscall_64+0x169/0x390
[ 354.956213][ T4652] ? lockdep_hardirqs_on_prepare+0xd7/0x190
[ 354.956220][ T4652] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 354.956225][ T4652] RIP: 0033:0x7ff812c54353
[ 354.956229][ T4652] Code: 00 00 00 00 00 66 90 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00
[ 354.956233][ T4652] RSP: 002b:00007ffdebe44c98 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
[ 354.956237][ T4652] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ff812c54353
[ 354.956240][ T4652] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
[ 354.956243][ T4652] RBP: 0000000000000000 R08: 0000000000000000 R09: 000055a6ea2c1f90
[ 354.956245][ T4652] R10: 00007ff812b7ee50 R11: 0000000000000246 R12: 0000000000000001
[ 354.956248][ T4652] R13: 00007ffdebe44ed0 R14: 000055a6bd29eb08 R15: 000055a6ea2c33e0
[ 354.956260][ T4652] </TASK>
[ 354.956262][ T4652]
[ 355.255635][ T4652] =============================
[ 355.260334][ T4652] WARNING: suspicious RCU usage
[ 355.265034][ T4652] 6.17.0-rc1-00001-gdfe0d675df82 #1 Tainted: G S I
[ 355.272672][ T4652] -----------------------------
[ 355.277375][ T4652] include/linux/rhashtable.h:376 suspicious rcu_dereference_check() usage!
[ 355.285767][ T4652]
[ 355.285767][ T4652] other info that might help us debug this:
[ 355.285767][ T4652]
[ 355.295845][ T4652]
[ 355.295845][ T4652] rcu_scheduler_active = 2, debug_locks = 1
[ 355.303744][ T4652] no locks held by ftracetest/4652.
[ 355.308785][ T4652]
[ 355.308785][ T4652] stack backtrace:
[ 355.314561][ T4652] CPU: 1 UID: 0 PID: 4652 Comm: ftracetest Tainted: G S I 6.17.0-rc1-00001-gdfe0d675df82 #1 PREEMPT(voluntary)
[ 355.314569][ T4652] Tainted: [S]=CPU_OUT_OF_SPEC, [I]=FIRMWARE_WORKAROUND
[ 355.314571][ T4652] Hardware name: Dell Inc. OptiPlex 7040/0Y7WYT, BIOS 1.1.1 10/07/2015
[ 355.314573][ T4652] Call Trace:
[ 355.314575][ T4652] <TASK>
[ 355.314578][ T4652] dump_stack_lvl+0x7c/0x90
[ 355.314585][ T4652] lockdep_rcu_suspicious+0x14f/0x1c0
[ 355.314594][ T4652] __rhashtable_lookup+0x181/0x260
[ 355.314600][ T4652] ? __pfx_kernel_clone+0x10/0x10
[ 355.314606][ T4652] fprobe_entry+0x9a/0x450
[ 355.314610][ T4652] ? __lock_acquire+0x6b0/0xca0
[ 355.314615][ T4652] ? find_held_lock+0x2b/0x80
[ 355.314621][ T4652] ? __pfx_fprobe_entry+0x10/0x10
[ 355.314625][ T4652] ? __pfx_kernel_clone+0x10/0x10
[ 355.314629][ T4652] ? lock_acquire+0x14c/0x2d0
[ 355.314646][ T4652] ? __might_fault+0x74/0xc0
[ 355.314655][ T4652] function_graph_enter_regs+0x2a0/0x550
[ 355.314659][ T4652] ? __do_sys_clone+0xb5/0x100
[ 355.314667][ T4652] ? __pfx_function_graph_enter_regs+0x10/0x10
[ 355.314671][ T4652] ? _copy_to_user+0x58/0x70
[ 355.314675][ T4652] ? __pfx_kernel_clone+0x10/0x10
[ 355.314679][ T4652] ? __x64_sys_rt_sigprocmask+0x114/0x180
[ 355.314684][ T4652] ? __pfx___x64_sys_rt_sigprocmask+0x10/0x10
[ 355.314689][ T4652] ? __pfx_kernel_clone+0x10/0x10
[ 355.314694][ T4652] ftrace_graph_func+0x87/0xb0
[ 355.314701][ T4652] 0xffffffffc0547095
[ 355.314708][ T4652] ? __pfx_handle_pte_fault+0x10/0x10
[ 355.314716][ T4652] ? kernel_clone+0x5/0x560
[ 355.314722][ T4652] kernel_clone+0x5/0x560
[ 355.314725][ T4652] __do_sys_clone+0xb5/0x100
[ 355.314730][ T4652] ? __pfx___do_sys_clone+0x10/0x10
[ 355.314743][ T4652] ? __might_fault+0x74/0xc0
[ 355.314748][ T4652] ? tracer_hardirqs_on+0x61/0x170
[ 355.314755][ T4652] ? __x64_sys_clone+0x4d/0x70
[ 355.314761][ T4652] do_syscall_64+0x8c/0x390
[ 355.314766][ T4652] ? __pfx___x64_sys_rt_sigprocmask+0x10/0x10
[ 355.314770][ T4652] ? handle_mm_fault+0x198/0x540
[ 355.314775][ T4652] ? exc_page_fault+0x57/0xb0
[ 355.314780][ T4652] ? lock_release+0x6c/0x130
[ 355.314785][ T4652] ? tracer_hardirqs_on+0x61/0x170
[ 355.314789][ T4652] ? do_user_addr_fault+0x400/0x730
[ 355.314796][ T4652] ? do_syscall_64+0x169/0x390
[ 355.314801][ T4652] ? lockdep_hardirqs_on_prepare+0xd7/0x190
[ 355.314808][ T4652] entry_SYSCALL_64_after_hwframe+0x76/0x7e
[ 355.314812][ T4652] RIP: 0033:0x7ff812c54353
[ 355.314816][ T4652] Code: 00 00 00 00 00 66 90 64 48 8b 04 25 10 00 00 00 45 31 c0 31 d2 31 f6 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 35 89 c2 85 c0 75 2c 64 48 8b 04 25 10 00 00
[ 355.314819][ T4652] RSP: 002b:00007ffdebe44c98 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
[ 355.314824][ T4652] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007ff812c54353
[ 355.314827][ T4652] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
[ 355.314829][ T4652] RBP: 0000000000000000 R08: 0000000000000000 R09: 000055a6ea2c1f90
[ 355.314831][ T4652] R10: 00007ff812b7ee50 R11: 0000000000000246 R12: 0000000000000001
[ 355.314834][ T4652] R13: 00007ffdebe44ed0 R14: 000055a6bd29eb08 R15: 000055a6ea2c33e0
[ 355.314846][ T4652] </TASK>
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20250828/202508281655.54c87330-lkp@intel.com
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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