FYI, we noticed the following commit (built with gcc-7): commit: fa84b6f5ae4279cb8ba47a00ad52514ae428e051 ("tracepoints: Use static_call") https://git.kernel.org/cgit/linux/kernel/git/peterz/queue.git x86/static_call in testcase: rcutorture with following parameters: runtime: 300s test: cpuhotplug torture_type: tasks test-description: rcutorture is rcutorture kernel module load/unload test. test-url: https://www.kernel.org/doc/Documentation/RCU/torture.txt on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 3G caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): +-------------------------------------------------------------------------------------------+------------+------------+ | | 109e4788a5 | fa84b6f5ae | +-------------------------------------------------------------------------------------------+------------+------------+ | boot_successes | 5 | 0 | | boot_failures | 11 | 348 | | BUG:kernel_reboot-without-warning_in_test_stage | 3 | | | BUG:kernel_NULL_pointer_dereference,address | 6 | 107 | | Oops:#[##] | 8 | 131 | | RIP:smp_call_function_single | 2 | 75 | | Kernel_panic-not_syncing:Fatal_exception_in_interrupt | 5 | 123 | | RIP:native_safe_halt | 4 | 101 | | Kernel_panic-not_syncing:Fatal_exception | 3 | 8 | | RIP:idle_cpu | 1 | | | RIP:__text_poke | 2 | 8 | | BUG:unable_to_handle_page_fault_for_address | 2 | 24 | | WARNING:at_arch/x86/kernel/static_call.c:#arch_static_call_transform | 0 | 348 | | RIP:arch_static_call_transform | 0 | 348 | | RIP:vprintk_emit | 0 | 3 | | RIP:native_write_msr | 0 | 17 | | Kernel_panic-not_syncing:stack-protector:Kernel_stack_is_corrupted_in:syscall_trace_enter | 0 | 4 | | RIP:text_poke_bp_batch | 0 | 1 | | RIP:native_send_call_func_single_ipi | 0 | 1 | | RIP:console_unlock | 0 | 2 | | RIP:llist_add_batch | 0 | 1 | +-------------------------------------------------------------------------------------------+------------+------------+ If you fix the issue, kindly add following tag Reported-by: kernel test robot <rong.a.chen(a)intel.com&gt; [ 0.644628] WARNING: CPU: 0 PID: 1 at arch/x86/kernel/static_call.c:30 arch_static_call_transform+0x9c/0xb0 [ 0.645608] Modules linked in: [ 0.645608] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.2.0-rc4-00086-gfa84b6f #11 [ 0.645608] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1 04/01/2014 [ 0.645608] RIP: 0010:arch_static_call_transform+0x9c/0xb0 [ 0.645608] Code: c9 ba 05 00 00 00 48 89 df 89 6c 24 04 e8 5c e0 ff ff eb b9 48 89 da 48 c7 c7 78 30 2d 8b c6 05 b6 b8 70 01 01 e8 b4 aa 0a 00 <0f> 0b eb 9f e8 4b ad 0a 00 90 90 90 90 90 90 90 90 90 90 90 48 89 [ 0.645608] RSP: 0000:ffffaf5a40637e10 EFLAGS: 00010286 [ 0.645608] RAX: 0000000000000000 RBX: ffffffff8bc2a655 RCX: 0000000000000000 [ 0.645608] RDX: 0000000000000001 RSI: ffffffff8be10161 RDI: 0000000000000246 [ 0.645608] RBP: ffffffff8a002090 R08: ffffffff8be10120 R09: 0000000000000041 [ 0.645608] R10: ffffaf5a40687d98 R11: 0000000000000001 R12: ffffffff8b614540 [ 0.645608] R13: ffffffff8bc2a655 R14: ffffffff8b614550 R15: ffffffff8b614550 [ 0.645608] FS: 0000000000000000(0000) GS:ffff8d6970200000(0000) knlGS:0000000000000000 [ 0.645608] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 0.645608] CR2: 00000000ffffffff CR3: 000000003f60a000 CR4: 00000000000406f0 [ 0.645608] Call Trace: [ 0.645608] static_call_init+0x133/0x17a [ 0.645608] ? stack_map_init+0x4e/0x4e [ 0.645608] do_one_initcall+0x44/0x1e4 [ 0.645608] ? proc_register+0xcd/0x130 [ 0.645608] kernel_init_freeable+0xf3/0x278 [ 0.645608] ? rest_init+0xd0/0xd0 [ 0.645608] kernel_init+0xa/0x110 [ 0.645608] ret_from_fork+0x35/0x40 [ 0.645608] ---[ end trace b52a5acc2a60c983 ]--- To reproduce: # build kernel cd linux cp config-5.2.0-rc4-00086-gfa84b6f .config make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 olddefconfig make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 prepare make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 modules_prepare make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 SHELL=/bin/bash make HOSTCC=gcc-7 CC=gcc-7 ARCH=x86_64 bzImage git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp qemu -k <bzImage> job-script # job-script is attached in this email Thanks, Rong Chen