tree: https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git tif-task_work head: d602372ff9f2e4aa14529819ce4f742dcdbcc466 commit: a301be6bf07eaf5f650906cfb8ad788dab922956 [6/32] arm: add support for TIF_NOTIFY_SIGNAL config: arm-randconfig-r015-20201013 (attached as .config) compiler: arm-linux-gnueabi-gcc (GCC) 9.3.0 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://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git/com... git remote add block https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux-block.git git fetch --no-tags block tif-task_work git checkout a301be6bf07eaf5f650906cfb8ad788dab922956 # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=arm If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): arch/arm/kernel/entry-common.S: Assembler messages: vim +94 arch/arm/kernel/entry-common.S ^1da177e4c3f41 Linus Torvalds 2005-04-16 67 3302caddf10ad5 Russell King 2015-08-20 68 /* Ok, we need to do extra processing, enter the slow path. */ ^1da177e4c3f41 Linus Torvalds 2005-04-16 69 fast_work_pending: ^1da177e4c3f41 Linus Torvalds 2005-04-16 70 str r0, [sp, #S_R0+S_OFF]! @ returned r0 3302caddf10ad5 Russell King 2015-08-20 71 /* fall through to work_pending */ 3302caddf10ad5 Russell King 2015-08-20 72 #else 3302caddf10ad5 Russell King 2015-08-20 73 /* b74406f37737c9 Mathieu Desnoyers 2018-06-02 74 * The "replacement" ret_fast_syscall for when tracing, context tracking, b74406f37737c9 Mathieu Desnoyers 2018-06-02 75 * or rseq debug is enabled. As we will need to call out to some C functions, b74406f37737c9 Mathieu Desnoyers 2018-06-02 76 * we save r0 first to avoid needing to save registers around each C function b74406f37737c9 Mathieu Desnoyers 2018-06-02 77 * call. 3302caddf10ad5 Russell King 2015-08-20 78 */ 3302caddf10ad5 Russell King 2015-08-20 79 ret_fast_syscall: afc9f65e01cd11 Vincent Whitchurch 2018-07-13 80 __ret_fast_syscall: 3302caddf10ad5 Russell King 2015-08-20 81 UNWIND(.fnstart ) 3302caddf10ad5 Russell King 2015-08-20 82 UNWIND(.cantunwind ) 3302caddf10ad5 Russell King 2015-08-20 83 str r0, [sp, #S_R0 + S_OFF]! @ save returned r0 b74406f37737c9 Mathieu Desnoyers 2018-06-02 84 #if IS_ENABLED(CONFIG_DEBUG_RSEQ) b74406f37737c9 Mathieu Desnoyers 2018-06-02 85 /* do_rseq_syscall needs interrupts enabled. */ b74406f37737c9 Mathieu Desnoyers 2018-06-02 86 mov r0, sp @ 'regs' b74406f37737c9 Mathieu Desnoyers 2018-06-02 87 bl do_rseq_syscall b74406f37737c9 Mathieu Desnoyers 2018-06-02 88 #endif 3302caddf10ad5 Russell King 2015-08-20 89 disable_irq_notrace @ disable interrupts e33f8d32677fa4 Thomas Garnier 2017-09-07 90 ldr r2, [tsk, #TI_ADDR_LIMIT] e33f8d32677fa4 Thomas Garnier 2017-09-07 91 cmp r2, #TASK_SIZE e33f8d32677fa4 Thomas Garnier 2017-09-07 92 blne addr_limit_check_failed 3302caddf10ad5 Russell King 2015-08-20 93 ldr r1, [tsk, #TI_FLAGS] @ re-check for syscall tracing 2404269bc4e77a Thomas Garnier 2017-09-07 @94 tst r1, #_TIF_SYSCALL_WORK | _TIF_WORK_MASK 3302caddf10ad5 Russell King 2015-08-20 95 beq no_work_pending 3302caddf10ad5 Russell King 2015-08-20 96 UNWIND(.fnend ) 3302caddf10ad5 Russell King 2015-08-20 97 ENDPROC(ret_fast_syscall) 3302caddf10ad5 Russell King 2015-08-20 98 3302caddf10ad5 Russell King 2015-08-20 99 /* Slower path - fall through to work_pending */ 3302caddf10ad5 Russell King 2015-08-20 100 #endif 3302caddf10ad5 Russell King 2015-08-20 101 3302caddf10ad5 Russell King 2015-08-20 102 tst r1, #_TIF_SYSCALL_WORK 3302caddf10ad5 Russell King 2015-08-20 103 bne __sys_trace_return_nosave 3302caddf10ad5 Russell King 2015-08-20 104 slow_work_pending: ^1da177e4c3f41 Linus Torvalds 2005-04-16 105 mov r0, sp @ 'regs' ^1da177e4c3f41 Linus Torvalds 2005-04-16 106 mov r2, why @ 'syscall' 0a267fa6a15d41 Al Viro 2012-07-19 107 bl do_work_pending 6628521784d1da Al Viro 2012-07-19 108 cmp r0, #0 81783786d5cf4a Al Viro 2012-07-19 109 beq no_work_pending 6628521784d1da Al Viro 2012-07-19 110 movlt scno, #(__NR_restart_syscall - __NR_SYSCALL_BASE) 81783786d5cf4a Al Viro 2012-07-19 111 ldmia sp, {r0 - r6} @ have to reload r0 - r6 81783786d5cf4a Al Viro 2012-07-19 112 b local_restart @ ... and off we go e83dd377002191 Drew Richardson 2015-08-06 113 ENDPROC(ret_fast_syscall) 81783786d5cf4a Al Viro 2012-07-19 114 :::::: The code at line 94 was first introduced by commit :::::: 2404269bc4e77a67875c8db6667be34c9913c96e Revert "arm/syscalls: Check address limit on user-mode return" :::::: TO: Thomas Garnier <thgarnie(a)google.com&gt; :::::: CC: Thomas Gleixner <tglx(a)linutronix.de&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org