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McKenney" , Will Deacon , Peter Zijlstra , Boqun Feng , Alan Stern , John Stultz , Neeraj Upadhyay , "Linus Torvalds" , Andrew Morton , Frederic Weisbecker , "Joel Fernandes" , Josh Triplett , Uladzislau Rezki , Steven Rostedt , Lai Jiangshan , Zqiang , Ingo Molnar , Waiman Long , "Mark Rutland" , Thomas Gleixner , Vlastimil Babka , Mateusz Guzik , "Jonas Oberhauser" , , , , , Mathieu Desnoyers , , , , Subject: Re: [RFC PATCH v2 4/4] sched+mm: Use hazard pointers to track lazy active mm existence Message-ID: <202410072229.18756716-oliver.sang@intel.com> Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20241004182734.1761555-5-mathieu.desnoyers@efficios.com> X-ClientProxiedBy: SI2PR06CA0012.apcprd06.prod.outlook.com (2603:1096:4:186::13) To LV3PR11MB8603.namprd11.prod.outlook.com (2603:10b6:408:1b6::9) X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Post: List-Subscribe: , , List-Unsubscribe: MIME-Version: 1.0 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W3LQK6N6/vE0WmWzU1vg1s8z3LunDVskiexYrHEtpiwDvUfuxf+Yd9TqzIJDKK9ZFbvcZyhmIQmSDie2g0MkKA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR11MB8443 X-OriginatorOrg: intel.com Hello, kernel test robot noticed "BUG:using_smp_processor_id()in_preemptible" on: commit: efef4da3b19cadf4beb45079a05643a77821de79 ("[RFC PATCH v2 4/4] sched+mm: Use hazard pointers to track lazy active mm existence") url: https://github.com/intel-lab-lkp/linux/commits/Mathieu-Desnoyers/compiler-h-Introduce-ptr_eq-to-preserve-address-dependency/20241005-023027 base: https://git.kernel.org/cgit/linux/kernel/git/powerpc/linux.git next patch link: https://lore.kernel.org/all/20241004182734.1761555-5-mathieu.desnoyers@efficios.com/ patch subject: [RFC PATCH v2 4/4] sched+mm: Use hazard pointers to track lazy active mm existence in testcase: boot compiler: gcc-12 test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G (please refer to attached dmesg/kmsg for entire log/backtrace) +--------------------------------------------+------------+------------+ | | 75b478bf10 | efef4da3b1 | +--------------------------------------------+------------+------------+ | BUG:using_smp_processor_id()in_preemptible | 0 | 12 | +--------------------------------------------+------------+------------+ 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 | Closes: https://lore.kernel.org/oe-lkp/202410072229.18756716-oliver.sang@intel.com [ 6.336856][ T48] BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u10:1/48 [ 6.338102][ T48] caller is debug_smp_processor_id (lib/smp_processor_id.c:61) [ 6.338809][ T48] CPU: 0 UID: 0 PID: 48 Comm: kworker/u10:1 Not tainted 6.12.0-rc1-00004-gefef4da3b19c #5 [ 6.339929][ T48] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [ 6.341119][ T48] Call Trace: [ 6.341504][ T48] dump_stack_lvl (lib/dump_stack.c:123) [ 6.342057][ T48] dump_stack (lib/dump_stack.c:130) [ 6.342065][ T48] check_preemption_disabled (arch/x86/include/asm/preempt.h:84 lib/smp_processor_id.c:53) [ 6.342065][ T48] debug_smp_processor_id (lib/smp_processor_id.c:61) [ 6.342065][ T48] exec_mmap (include/linux/sched/mm.h:91 fs/exec.c:1017) [ 6.342065][ T48] ? would_dump (fs/exec.c:1409) [ 6.342065][ T48] begin_new_exec (fs/exec.c:1280) [ 6.342065][ T48] ? load_elf_phdrs (fs/binfmt_elf.c:534) [ 6.342065][ T48] load_elf_binary (fs/binfmt_elf.c:996) [ 6.342065][ T48] ? get_lock_stats (kernel/locking/lockdep.c:339) [ 6.342065][ T48] ? search_binary_handler (fs/exec.c:1752) [ 6.342065][ T48] search_binary_handler (fs/exec.c:1752) [ 6.342065][ T48] exec_binprm (fs/exec.c:1795) [ 6.342065][ T48] bprm_execve (fs/exec.c:1846 fs/exec.c:1821) [ 6.342065][ T48] kernel_execve (fs/exec.c:2012) [ 6.342065][ T48] call_usermodehelper_exec_async (kernel/umh.c:110) [ 6.342065][ T48] ? umh_complete (kernel/umh.c:65) [ 6.342065][ T48] ret_from_fork (arch/x86/kernel/process.c:153) [ 6.342065][ T48] ? umh_complete (kernel/umh.c:65) [ 6.342065][ T48] ret_from_fork_asm (arch/x86/entry/entry_32.S:737) [ 6.342065][ T48] entry_INT80_32 (arch/x86/entry/entry_32.S:944) [ 6.352140][ T1] ppdev: user-space parallel port driver [ 6.353841][ T1] HSI/SSI char device loaded [ 6.354238][ T1] e1000: Intel(R) PRO/1000 Network Driver [ 6.354673][ T1] e1000: Copyright (c) 1999-2006 Intel Corporation. [ 6.650009][ T1] ACPI: _SB_.LNKC: Enabled at IRQ 11 [ 6.968868][ T1] e1000 0000:00:03.0 eth0: (PCI:33MHz:32-bit) 52:54:00:12:34:56 [ 6.969500][ T1] e1000 0000:00:03.0 eth0: Intel(R) PRO/1000 Network Connection [ 6.970506][ T49] BUG: using smp_processor_id() in preemptible [00000000] code: kworker/u10:1/49 [ 6.971191][ T49] caller is debug_smp_processor_id (lib/smp_processor_id.c:61) [ 6.971650][ T49] CPU: 0 UID: 0 PID: 49 Comm: kworker/u10:1 Not tainted 6.12.0-rc1-00004-gefef4da3b19c #5 [ 6.972365][ T49] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 [ 6.973115][ T49] Call Trace: [ 6.973356][ T49] dump_stack_lvl (lib/dump_stack.c:123) [ 6.973686][ T49] dump_stack (lib/dump_stack.c:130) [ 6.973983][ T49] check_preemption_disabled (arch/x86/include/asm/preempt.h:84 lib/smp_processor_id.c:53) [ 6.974328][ T49] debug_smp_processor_id (lib/smp_processor_id.c:61) [ 6.974328][ T49] exec_mmap (include/linux/sched/mm.h:91 fs/exec.c:1017) [ 6.974328][ T49] ? would_dump (fs/exec.c:1409) [ 6.974328][ T49] begin_new_exec (fs/exec.c:1280) [ 6.974328][ T49] ? load_elf_phdrs (fs/binfmt_elf.c:534) [ 6.974328][ T49] load_elf_binary (fs/binfmt_elf.c:996) [ 6.974328][ T49] ? get_lock_stats (kernel/locking/lockdep.c:339) [ 6.974328][ T49] ? search_binary_handler (fs/exec.c:1752) [ 6.974328][ T49] search_binary_handler (fs/exec.c:1752) [ 6.974328][ T49] exec_binprm (fs/exec.c:1795) [ 6.974328][ T49] bprm_execve (fs/exec.c:1846 fs/exec.c:1821) [ 6.974328][ T49] kernel_execve (fs/exec.c:2012) [ 6.974328][ T49] call_usermodehelper_exec_async (kernel/umh.c:110) [ 6.974328][ T49] ? umh_complete (kernel/umh.c:65) [ 6.974328][ T49] ret_from_fork (arch/x86/kernel/process.c:153) [ 6.974328][ T49] ? umh_complete (kernel/umh.c:65) [ 6.974328][ T49] ret_from_fork_asm (arch/x86/entry/entry_32.S:737) [ 6.974328][ T49] entry_INT80_32 (arch/x86/entry/entry_32.S:944) The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20241007/202410072229.18756716-oliver.sang@intel.com -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki