From: kernel test robot <lkp@intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev
Subject: [peterz-queue:locking/core 10/10] kernel/futex/core.c:982:1: warning: spinlock 'atomic ? __u.__val : q->lock_ptr' is still held at the end of function
Date: Thu, 22 Jan 2026 10:30:28 +0800 [thread overview]
Message-ID: <202601221040.TeM0ihff-lkp@intel.com> (raw)
tree: https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git locking/core
head: 33d9e7fdf9c17417347d1f06ddebaf25f21ab62a
commit: 33d9e7fdf9c17417347d1f06ddebaf25f21ab62a [10/10] futex: Convert to compiler context analysis
config: arm64-randconfig-001-20260122 (https://download.01.org/0day-ci/archive/20260122/202601221040.TeM0ihff-lkp@intel.com/config)
compiler: clang version 22.0.0git (https://github.com/llvm/llvm-project 9b8addffa70cee5b2acc5454712d9cf78ce45710)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260122/202601221040.TeM0ihff-lkp@intel.com/reproduce)
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 <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202601221040.TeM0ihff-lkp@intel.com/
All warnings (new ones prefixed by >>):
>> kernel/futex/core.c:982:1: warning: spinlock 'atomic ? __u.__val : q->lock_ptr' is still held at the end of function [-Wthread-safety-analysis]
982 | }
| ^
kernel/futex/core.c:976:2: note: spinlock acquired here
976 | spin_lock(lock_ptr);
| ^
>> kernel/futex/core.c:982:1: warning: expecting spinlock 'q->lock_ptr' to be held at the end of function [-Wthread-safety-analysis]
982 | }
| ^
kernel/futex/core.c:966:6: note: spinlock acquired here
966 | void futex_q_lockptr_lock(struct futex_q *q)
| ^
2 warnings generated.
vim +982 kernel/futex/core.c
c1e2f0eaf015fb kernel/futex.c Peter Zijlstra 2017-12-08 965
b04b8f3032aae6 kernel/futex/core.c Sebastian Andrzej Siewior 2025-04-16 966 void futex_q_lockptr_lock(struct futex_q *q)
b04b8f3032aae6 kernel/futex/core.c Sebastian Andrzej Siewior 2025-04-16 967 {
b04b8f3032aae6 kernel/futex/core.c Sebastian Andrzej Siewior 2025-04-16 968 spinlock_t *lock_ptr;
b04b8f3032aae6 kernel/futex/core.c Sebastian Andrzej Siewior 2025-04-16 969
b04b8f3032aae6 kernel/futex/core.c Sebastian Andrzej Siewior 2025-04-16 970 /*
b04b8f3032aae6 kernel/futex/core.c Sebastian Andrzej Siewior 2025-04-16 971 * See futex_unqueue() why lock_ptr can change.
b04b8f3032aae6 kernel/futex/core.c Sebastian Andrzej Siewior 2025-04-16 972 */
b04b8f3032aae6 kernel/futex/core.c Sebastian Andrzej Siewior 2025-04-16 973 guard(rcu)();
b04b8f3032aae6 kernel/futex/core.c Sebastian Andrzej Siewior 2025-04-16 974 retry:
b04b8f3032aae6 kernel/futex/core.c Sebastian Andrzej Siewior 2025-04-16 975 lock_ptr = READ_ONCE(q->lock_ptr);
b04b8f3032aae6 kernel/futex/core.c Sebastian Andrzej Siewior 2025-04-16 976 spin_lock(lock_ptr);
b04b8f3032aae6 kernel/futex/core.c Sebastian Andrzej Siewior 2025-04-16 977
b04b8f3032aae6 kernel/futex/core.c Sebastian Andrzej Siewior 2025-04-16 978 if (unlikely(lock_ptr != q->lock_ptr)) {
b04b8f3032aae6 kernel/futex/core.c Sebastian Andrzej Siewior 2025-04-16 979 spin_unlock(lock_ptr);
b04b8f3032aae6 kernel/futex/core.c Sebastian Andrzej Siewior 2025-04-16 980 goto retry;
b04b8f3032aae6 kernel/futex/core.c Sebastian Andrzej Siewior 2025-04-16 981 }
b04b8f3032aae6 kernel/futex/core.c Sebastian Andrzej Siewior 2025-04-16 @982 }
b04b8f3032aae6 kernel/futex/core.c Sebastian Andrzej Siewior 2025-04-16 983
:::::: The code at line 982 was first introduced by commit
:::::: b04b8f3032aae6121303bfa324c768faba032242 futex: Introduce futex_q_lockptr_lock()
:::::: TO: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
:::::: CC: Peter Zijlstra <peterz@infradead.org>
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
next reply other threads:[~2026-01-22 2:31 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-22 2:30 kernel test robot [this message]
2026-01-22 9:16 ` [peterz-queue:locking/core 10/10] kernel/futex/core.c:982:1: warning: spinlock 'atomic ? __u.__val : q->lock_ptr' is still held at the end of function Peter Zijlstra
2026-01-22 18:31 ` Marco Elver
2026-01-23 8:55 ` Peter Zijlstra
2026-01-23 14:37 ` Marco Elver
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