| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <202211291341.VgUcDmXr-lkp@intel.com>
Date: Tue, 29 Nov 2022 13:16:27 +0800
From: kernel test robot <lkp@...el.com>
To: Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
Will Deacon <will@...nel.org>, Jan Kara <jack@...e.cz>
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
Waiman Long <longman@...hat.com>,
LKML <linux-kernel@...r.kernel.org>,
Thomas Gleixner <tglx@...utronix.de>,
Steven Rostedt <rostedt@...dmis.org>,
Mel Gorman <mgorman@...e.de>,
Peter Zijlstra <peterz@...radead.org>,
Ingo Molnar <mingo@...hat.com>,
Catalin Marinas <catalin.marinas@....com>
Subject: Re: Re: Crash with PREEMPT_RT on aarch64 machine
Hi Sebastian,
Thank you for the patch! Yet something to improve:
[auto build test ERROR on tip/locking/core]
[also build test ERROR on linus/master v6.1-rc7 next-20221128]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Sebastian-Andrzej-Siewior/Re-Crash-with-PREEMPT_RT-on-aarch64-machine/20221129-000000
patch link: https://lore.kernel.org/r/Y4Tapja2qq8HiHBZ%40linutronix.de
patch subject: Re: Crash with PREEMPT_RT on aarch64 machine
config: hexagon-randconfig-r041-20221128
compiler: clang version 16.0.0 (https://github.com/llvm/llvm-project 6e4cea55f0d1104408b26ac574566a0e4de48036)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://github.com/intel-lab-lkp/linux/commit/d4aea399f0b5472dc15a4c623d99b4ae79005050
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Sebastian-Andrzej-Siewior/Re-Crash-with-PREEMPT_RT-on-aarch64-machine/20221129-000000
git checkout d4aea399f0b5472dc15a4c623d99b4ae79005050
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=hexagon SHELL=/bin/bash kernel/
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>
All error/warnings (new ones prefixed by >>):
In file included from kernel/locking/rtmutex_api.c:9:
>> kernel/locking/rtmutex.c:100:15: error: incompatible integer to pointer conversion initializing 'typeof (*(__ai_ptr))' (aka 'struct task_struct *') with an expression of type 'unsigned long' [-Wint-conversion]
WARN_ON_ONCE(cmpxchg_acquire(&lock->owner, RT_MUTEX_HAS_WAITERS, val) != RT_MUTEX_HAS_WAITERS);
~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/atomic/atomic-instrumented.h:1923:2: note: expanded from macro 'cmpxchg_acquire'
arch_cmpxchg_acquire(__ai_ptr, __VA_ARGS__); \
^
include/linux/atomic/atomic-arch-fallback.h:35:30: note: expanded from macro 'arch_cmpxchg_acquire'
#define arch_cmpxchg_acquire arch_cmpxchg
^
arch/hexagon/include/asm/cmpxchg.h:57:21: note: expanded from macro 'arch_cmpxchg'
__typeof__(*(ptr)) __old = (old); \
^
include/asm-generic/bug.h:180:41: note: expanded from macro 'WARN_ON_ONCE'
#define WARN_ON_ONCE(condition) WARN_ON(condition)
~~~~~~~~^~~~~~~~~~
include/asm-generic/bug.h:167:25: note: expanded from macro 'WARN_ON'
int __ret_warn_on = !!(condition); \
^~~~~~~~~
In file included from kernel/locking/rtmutex_api.c:9:
>> kernel/locking/rtmutex.c:100:15: error: incompatible integer to pointer conversion initializing 'typeof (*(__ai_ptr))' (aka 'struct task_struct *') with an expression of type 'unsigned long' [-Wint-conversion]
WARN_ON_ONCE(cmpxchg_acquire(&lock->owner, RT_MUTEX_HAS_WAITERS, val) != RT_MUTEX_HAS_WAITERS);
~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/atomic/atomic-instrumented.h:1923:2: note: expanded from macro 'cmpxchg_acquire'
arch_cmpxchg_acquire(__ai_ptr, __VA_ARGS__); \
^
include/linux/atomic/atomic-arch-fallback.h:35:30: note: expanded from macro 'arch_cmpxchg_acquire'
#define arch_cmpxchg_acquire arch_cmpxchg
^
arch/hexagon/include/asm/cmpxchg.h:58:21: note: expanded from macro 'arch_cmpxchg'
__typeof__(*(ptr)) __new = (new); \
^
include/asm-generic/bug.h:180:41: note: expanded from macro 'WARN_ON_ONCE'
#define WARN_ON_ONCE(condition) WARN_ON(condition)
~~~~~~~~^~~~~~~~~~
include/asm-generic/bug.h:167:25: note: expanded from macro 'WARN_ON'
int __ret_warn_on = !!(condition); \
^~~~~~~~~
In file included from kernel/locking/rtmutex_api.c:9:
>> kernel/locking/rtmutex.c:100:72: warning: comparison between pointer and integer ('typeof (*(__ai_ptr))' (aka 'struct task_struct *') and 'unsigned long') [-Wpointer-integer-compare]
WARN_ON_ONCE(cmpxchg_acquire(&lock->owner, RT_MUTEX_HAS_WAITERS, val) != RT_MUTEX_HAS_WAITERS);
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
include/asm-generic/bug.h:180:41: note: expanded from macro 'WARN_ON_ONCE'
#define WARN_ON_ONCE(condition) WARN_ON(condition)
~~~~~~~~^~~~~~~~~~
include/asm-generic/bug.h:167:25: note: expanded from macro 'WARN_ON'
int __ret_warn_on = !!(condition); \
^~~~~~~~~
In file included from kernel/locking/rtmutex_api.c:9:
>> kernel/locking/rtmutex.c:117:2: error: incompatible integer to pointer conversion assigning to 'volatile typeof (lock->owner)' (aka 'struct task_struct *volatile') from 'unsigned long' [-Wint-conversion]
WRITE_ONCE(lock->owner, val);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:61:2: note: expanded from macro 'WRITE_ONCE'
__WRITE_ONCE(x, val); \
^~~~~~~~~~~~~~~~~~~~
include/asm-generic/rwonce.h:55:30: note: expanded from macro '__WRITE_ONCE'
*(volatile typeof(x) *)&(x) = (val); \
^ ~~~~~
1 warning and 3 errors generated.
vim +100 kernel/locking/rtmutex.c
64
65 /*
66 * lock->owner state tracking:
67 *
68 * lock->owner holds the task_struct pointer of the owner. Bit 0
69 * is used to keep track of the "lock has waiters" state.
70 *
71 * owner bit0
72 * NULL 0 lock is free (fast acquire possible)
73 * NULL 1 lock is free and has waiters and the top waiter
74 * is going to take the lock*
75 * taskpointer 0 lock is held (fast release possible)
76 * taskpointer 1 lock is held and has waiters**
77 *
78 * The fast atomic compare exchange based acquire and release is only
79 * possible when bit 0 of lock->owner is 0.
80 *
81 * (*) It also can be a transitional state when grabbing the lock
82 * with ->wait_lock is held. To prevent any fast path cmpxchg to the lock,
83 * we need to set the bit0 before looking at the lock, and the owner may be
84 * NULL in this small time, hence this can be a transitional state.
85 *
86 * (**) There is a small time when bit 0 is set but there are no
87 * waiters. This can happen when grabbing the lock in the slow path.
88 * To prevent a cmpxchg of the owner releasing the lock, we need to
89 * set this bit before looking at the lock.
90 */
91
92 static __always_inline void
93 rt_mutex_set_owner(struct rt_mutex_base *lock, struct task_struct *owner)
94 {
95 unsigned long val = (unsigned long)owner;
96
97 if (rt_mutex_has_waiters(lock))
98 val |= RT_MUTEX_HAS_WAITERS;
99
> 100 WARN_ON_ONCE(cmpxchg_acquire(&lock->owner, RT_MUTEX_HAS_WAITERS, val) != RT_MUTEX_HAS_WAITERS);
101 }
102
103 static __always_inline void clear_rt_mutex_waiters(struct rt_mutex_base *lock)
104 {
105 lock->owner = (struct task_struct *)
106 ((unsigned long)lock->owner & ~RT_MUTEX_HAS_WAITERS);
107 }
108
109 static __always_inline void
110 rt_mutex_set_owner_pi(struct rt_mutex_base *lock, struct task_struct *owner)
111 {
112 unsigned long val = (unsigned long)owner;
113
114 if (rt_mutex_has_waiters(lock))
115 val |= RT_MUTEX_HAS_WAITERS;
116
> 117 WRITE_ONCE(lock->owner, val);
118 }
119
--
0-DAY CI Kernel Test Service
https://01.org/lkp
View attachment "config" of type "text/plain" (137698 bytes)
Powered by blists - more mailing lists