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([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id k23-20020a5d97d7000000b00740694b5f43sm861339ios.46.2023.03.14.07.40.27 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 14 Mar 2023 07:40:28 -0700 (PDT) Sender: Guenter Roeck Message-ID: <38695adb-c654-c83f-5bbf-ad22a59a62bd@roeck-us.net> Date: Tue, 14 Mar 2023 07:40:27 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.7.1 Subject: Re: Linux 6.3-rc2 Content-Language: en-US To: Frederic Weisbecker , Ard Biesheuvel Cc: Linus Torvalds , "Paul E. McKenney" , Peter Zijlstra , Linux Kernel Mailing List References: From: Guenter Roeck In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 3/14/23 04:18, Frederic Weisbecker wrote: > Le Mon, Mar 13, 2023 at 05:52:49PM -0700, Guenter Roeck a écrit : >> On 3/13/23 16:11, Frederic Weisbecker wrote: >> [ 11.360487] WARNING: CPU: 0 PID: 233 at kernel/locking/lockdep.c:5527 check_flags (./arch/arm/include/asm/current.h:36 (discriminator 12) ./include/asm-generic/preempt.h:11 (discriminator 12) kernel/locking/lockdep.c:5528 (discriminator 12)) >> [ 11.361102] DEBUG_LOCKS_WARN_ON(current->softirqs_enabled) >> [ 11.361173] Modules linked in: >> [ 11.361730] CPU: 0 PID: 233 Comm: rcS Tainted: G N 6.3.0-rc2-dirty #2 >> [ 11.361921] Hardware name: Freescale i.MX6 Ultralite (Device Tree) >> [ 11.362303] unwind_backtrace from show_stack (arch/arm/kernel/traps.c:258) >> [ 11.362441] show_stack from dump_stack_lvl (lib/dump_stack.c:107 (discriminator 4)) >> [ 11.362519] dump_stack_lvl from __warn (./include/linux/jump_label.h:260 ./include/linux/jump_label.h:270 ./include/trace/events/error_report.h:69 kernel/panic.c:681) >> [ 11.362598] __warn from warn_slowpath_fmt (./arch/arm/include/asm/current.h:36 ./include/asm-generic/preempt.h:16 ./include/asm-generic/preempt.h:59 ./include/linux/context_tracking.h:154 kernel/panic.c:706) >> [ 11.362702] warn_slowpath_fmt from check_flags (./arch/arm/include/asm/current.h:36 (discriminator 12) ./include/asm-generic/preempt.h:11 (discriminator 12) kernel/locking/lockdep.c:5528 (discriminator 12)) >> [ 11.362780] check_flags from lock_is_held_type (./arch/arm/include/asm/percpu.h:37 kernel/locking/lockdep.c:462 kernel/locking/lockdep.c:5713) >> [ 11.362851] lock_is_held_type from rcu_read_lock_sched_held (kernel/rcu/update.c:125) >> [ 11.362933] rcu_read_lock_sched_held from trace_rcu_dyntick (./include/trace/events/rcu.h:480 (discriminator 28)) >> [ 11.363016] trace_rcu_dyntick from ct_nmi_enter (./arch/arm/include/asm/percpu.h:37 (discriminator 4) ./include/linux/context_tracking_state.h:90 (discriminator 4) kernel/context_tracking.c:301 (discriminator 4)) >> [ 11.363108] ct_nmi_enter from irq_enter (kernel/softirq.c:625) >> [ 11.363177] irq_enter from generic_handle_arch_irq (kernel/irq/handle.c:238) >> [ 11.363251] generic_handle_arch_irq from call_with_stack (arch/arm/lib/call_with_stack.S:45) >> [ 11.363339] call_with_stack from __irq_svc (arch/arm/kernel/entry-armv.S:232) >> [ 11.363438] Exception stack(0xd1819f60 to 0xd1819fa8) >> [ 11.363629] 9f60: ecac8b10 40000000 b6f88418 c1c2607c 00000000 40000000 c4acc00b 00000001 >> [ 11.363740] 9f80: 00000b00 c0101278 c4acc0f0 00000000 00000051 d1819fb0 c01011c4 c0103c1c >> [ 11.363833] 9fa0: 00000013 ffffffff >> [ 11.363896] __irq_svc from vfp_reload_hw (arch/arm/vfp/vfphw.S:149) >> [ 11.364015] irq event stamp: 1626 >> [ 11.364069] hardirqs last enabled at (1625): __und_usr (arch/arm/kernel/entry-armv.S:465) >> [ 11.364199] hardirqs last disabled at (1626): __irq_svc (arch/arm/kernel/entry-armv.S:221) >> [ 11.364290] softirqs last enabled at (1424): __do_softirq (./arch/arm/include/asm/current.h:36 ./include/asm-generic/preempt.h:11 kernel/softirq.c:415 kernel/softirq.c:600) >> [ 11.364396] softirqs last disabled at (1323): __irq_exit_rcu (kernel/softirq.c:445 kernel/softirq.c:650) >> [ 11.364494] ---[ end trace 0000000000000000 ]--- >> [ 11.364637] preempt_count(): 201 softirq_count(): 200 >> ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ > > Ok so this is a softirq disabled section that doesn't handle the lockdep > part. > > How does the following look like as a culprit? > > 62b95a7b44d1 (ARM: 9282/1: vfp: Manipulate task VFP state with softirqs disabled) > I'll give it a try. Sorry for the misleading bisect results I sent earlier. Thanks, Guenter