Greeting, FYI, we noticed the following commit (built with gcc-9): commit: 31c9ccb1389d10c7d5b0d6c74b953b301e7e23ec ("Revert "ANDROID: vendor_hooks: add waiting information for blocked tasks"") https://android.googlesource.com/kernel/common android-mainline in testcase: locktorture version: with following parameters: runtime: 300s test: default test-description: This torture test consists of creating a number of kernel threads which acquire the lock and hold it for specific amount of time, thus simulating different critical region behaviors. test-url: https://www.kernel.org/doc/Documentation/locking/locktorture.txt on test machine: qemu-system-i386 -enable-kvm -cpu SandyBridge -smp 2 -m 4G caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): +------------------------------------------------------------------+------------+------------+ | | bf2290a48a | 31c9ccb138 | +------------------------------------------------------------------+------------+------------+ | boot_successes | 35 | 0 | | WARNING:at_kernel/locking/mutex-debug.c:#debug_mutex_free_waiter | 0 | 45 | | EIP:debug_mutex_free_waiter | 0 | 45 | | BUG:unable_to_handle_page_fault_for_address | 0 | 45 | | Oops:#[##] | 0 | 45 | | EIP:wake_q_add | 0 | 45 | | Kernel_panic-not_syncing:Fatal_exception | 0 | 45 | +------------------------------------------------------------------+------------+------------+ If you fix the issue, kindly add following tag Reported-by: kernel test robot <oliver.sang(a)intel.com&gt; [ 12.186534][ T114] WARNING: CPU: 0 PID: 114 at kernel/locking/mutex-debug.c:47 debug_mutex_free_waiter (kernel/locking/mutex-debug.c:47 (discriminator 9)) [ 12.189117][ T114] Modules linked in: [ 12.189687][ T114] CPU: 0 PID: 114 Comm: kworker/0:2 Not tainted 5.14.0-03346-g31c9ccb1389d #1 [ 12.190927][ T114] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 [ 12.192286][ T114] Workqueue: events test_abba_work [ 12.193046][ T114] EIP: debug_mutex_free_waiter (kernel/locking/mutex-debug.c:47 (discriminator 9)) [ 12.193855][ T114] Code: 5d fc c9 c3 8d 74 26 00 e8 6b da 29 00 85 c0 74 cc 8b 0d 0c 67 a4 82 85 c9 75 c2 68 a5 6e 40 82 68 77 6f 3f 82 e8 57 43 af 00 <0f> 0b 58 5a eb ad 8d b4 26 00 00 00 00 90 55 89 e5 56 56 89 d6 8b All code ======== 0: 5d pop %rbp 1: fc cld 2: c9 leaveq 3: c3 retq 4: 8d 74 26 00 lea 0x0(%rsi,%riz,1),%esi 8: e8 6b da 29 00 callq 0x29da78 d: 85 c0 test %eax,%eax f: 74 cc je 0xffffffffffffffdd 11: 8b 0d 0c 67 a4 82 mov -0x7d5b98f4(%rip),%ecx # 0xffffffff82a46723 17: 85 c9 test %ecx,%ecx 19: 75 c2 jne 0xffffffffffffffdd 1b: 68 a5 6e 40 82 pushq $0xffffffff82406ea5 20: 68 77 6f 3f 82 pushq $0xffffffff823f6f77 25: e8 57 43 af 00 callq 0xaf4381 2a:* 0f 0b ud2 <-- trapping instruction 2c: 58 pop %rax 2d: 5a pop %rdx 2e: eb ad jmp 0xffffffffffffffdd 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 90 nop 38: 55 push %rbp 39: 89 e5 mov %esp,%ebp 3b: 56 push %rsi 3c: 56 push %rsi 3d: 89 d6 mov %edx,%esi 3f: 8b .byte 0x8b Code starting with the faulting instruction =========================================== 0: 0f 0b ud2 2: 58 pop %rax 3: 5a pop %rdx 4: eb ad jmp 0xffffffffffffffb3 6: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi d: 90 nop e: 55 push %rbp f: 89 e5 mov %esp,%ebp 11: 56 push %rsi 12: 56 push %rsi 13: 89 d6 mov %edx,%esi 15: 8b .byte 0x8b [ 12.196758][ T114] EAX: 0000002f EBX: 804b9e9c ECX: 00000000 EDX: 00000000 [ 12.197850][ T114] ESI: 804b9ee0 EDI: 00000000 EBP: 804b9e70 ESP: 804b9e64 [ 12.198938][ T114] DS: 007b ES: 007b FS: 0000 GS: 0000 SS: 0068 EFLAGS: 00010286 [ 12.200100][ T114] CR0: 80050033 CR2: 00000000 CR3: 02b53000 CR4: 00040690 [ 12.201109][ T114] Call Trace: [ 12.201585][ T114] __ww_mutex_lock+0x544/0xb00 [ 12.202403][ T114] ww_mutex_lock (kernel/locking/mutex.c:1193 (discriminator 1)) [ 12.203142][ T114] ? test_abba_work (kernel/locking/test-ww_mutex.c:170) [ 12.203957][ T114] test_abba_work (kernel/locking/test-ww_mutex.c:170) [ 12.204681][ T114] process_one_work (arch/x86/include/asm/atomic.h:29 include/asm-generic/atomic-instrumented.h:28 include/linux/jump_label.h:266 include/linux/jump_label.h:276 include/trace/events/workqueue.h:108 kernel/workqueue.c:2285) [ 12.205423][ T114] worker_thread (include/linux/list.h:282 kernel/workqueue.c:2427) [ 12.206148][ T114] kthread (kernel/kthread.c:319) [ 12.206796][ T114] ? process_one_work (kernel/workqueue.c:2369) [ 12.207671][ T114] ? set_kthread_struct (kernel/kthread.c:272) [ 12.208440][ T114] ret_from_fork (arch/x86/entry/entry_32.S:775) [ 12.209112][ T114] irq event stamp: 233629 [ 12.209747][ T114] hardirqs last enabled at (233629): _raw_spin_unlock_irq (arch/x86/include/asm/irqflags.h:45 arch/x86/include/asm/irqflags.h:80 include/linux/spinlock_api_smp.h:168 kernel/locking/spinlock.c:199) [ 12.211202][ T114] hardirqs last disabled at (233628): _raw_spin_lock_irq (include/linux/spinlock_api_smp.h:126 kernel/locking/spinlock.c:167) [ 12.212760][ T114] softirqs last enabled at (233496): __do_softirq (arch/x86/include/asm/preempt.h:27 kernel/softirq.c:405 kernel/softirq.c:590) [ 12.214057][ T114] softirqs last disabled at (233487): do_softirq_own_stack (arch/x86/kernel/irq_32.c:60 arch/x86/kernel/irq_32.c:149) [ 12.215447][ T114] ---[ end trace ad0727e888d52121 ]--- To reproduce: # build kernel cd linux cp config-5.14.0-03346-g31c9ccb1389d .config make HOSTCC=gcc-9 CC=gcc-9 ARCH=i386 olddefconfig prepare modules_prepare bzImage modules make HOSTCC=gcc-9 CC=gcc-9 ARCH=i386 INSTALL_MOD_PATH=<mod-install-dir> modules_install cd <mod-install-dir> find lib/ | cpio -o -H newc --quiet | gzip > modules.cgz git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp qemu -k <bzImage> -m modules.cgz job-script # job-script is attached in this email --- 0DAY/LKP+ Test Infrastructure Open Source Technology Center https://lists.01.org/hyperkitty/list/lkp@lists.01.org Intel Corporation Thanks, Oliver Sang