================================================================== BUG: KASAN: stack-out-of-bounds in deref_stack_regs arch/x86/kernel/unwind_orc.c:349 [inline] BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x195c/0x1c60 arch/x86/kernel/unwind_orc.c:515 Read of size 8 at addr ffff88809df6fec8 by task syz-executor.3/20491 CPU: 0 PID: 20491 Comm: syz-executor.3 Not tainted 4.19.180-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354 kasan_report mm/kasan/report.c:412 [inline] __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433 deref_stack_regs arch/x86/kernel/unwind_orc.c:349 [inline] unwind_next_frame+0x195c/0x1c60 arch/x86/kernel/unwind_orc.c:515 perf_callchain_kernel+0x3fa/0x5c0 arch/x86/events/core.c:2346 get_perf_callchain+0x392/0x860 kernel/events/callchain.c:202 perf_callchain+0x165/0x1c0 kernel/events/core.c:6450 perf_prepare_sample+0x81e/0x1620 kernel/events/core.c:6477 __perf_event_output kernel/events/core.c:6592 [inline] perf_event_output_forward+0xf3/0x270 kernel/events/core.c:6610 __perf_event_overflow+0x13c/0x370 kernel/events/core.c:7883 perf_swevent_overflow kernel/events/core.c:7959 [inline] perf_swevent_event+0x347/0x550 kernel/events/core.c:7987 perf_tp_event+0x29f/0xaa0 kernel/events/core.c:8415 perf_trace_run_bpf_submit+0x144/0x220 kernel/events/core.c:8389 perf_trace_sys_exit+0x2dc/0x460 include/trace/events/syscalls.h:44 trace_sys_exit include/trace/events/syscalls.h:44 [inline] syscall_slow_exit_work+0x36c/0x630 arch/x86/entry/common.c:231 syscall_return_slowpath arch/x86/entry/common.c:268 [inline] do_syscall_64+0x523/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x465f69 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f07e7c7b218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 0000000000000001 RBX: 000000000056bf68 RCX: 0000000000465f69 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 000000000056bf6c RBP: 000000000056bf60 R08: 000000000000000e R09: 0000000000000000 R10: 0000000020ffc000 R11: 0000000000000246 R12: 000000000056bf6c R13: 00007fff1fdd464f R14: 00007f07e7c7b300 R15: 0000000000022000 The buggy address belongs to the page: page:ffffea000277dbc0 count:0 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0xfff00000000000() raw: 00fff00000000000 0000000000000000 ffffffff02770101 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88809df6fd80: 04 f2 00 f3 f3 f3 00 00 00 00 00 00 00 00 00 00 ffff88809df6fe00: 00 00 f1 f1 f1 f1 00 00 00 00 00 00 00 00 00 00 >ffff88809df6fe80: 00 00 00 00 00 00 f3 f3 f3 f3 00 00 00 00 00 00 ^ ffff88809df6ff00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88809df6ff80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================