================================================================== BUG: KASAN: out-of-bounds in unwind_next_frame+0x1571/0x17a0 arch/x86/kernel/unwind_orc.c:470 Read of size 8 at addr ffff88815daff978 by task syz-executor.5/14966 CPU: 0 PID: 14966 Comm: syz-executor.5 Not tainted 4.14.179-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x13e/0x194 lib/dump_stack.c:58 print_address_description.cold+0x7c/0x1e2 mm/kasan/report.c:252 kasan_report_error mm/kasan/report.c:351 [inline] kasan_report mm/kasan/report.c:409 [inline] kasan_report.cold+0xa9/0x2ae mm/kasan/report.c:393 unwind_next_frame+0x1571/0x17a0 arch/x86/kernel/unwind_orc.c:470 __save_stack_trace+0x6b/0xd0 arch/x86/kernel/stacktrace.c:44 save_stack_trace_tsk arch/x86/kernel/stacktrace.c:73 [inline] save_stack_trace_tsk+0x34/0x40 arch/x86/kernel/stacktrace.c:68 proc_pid_stack+0x164/0x240 fs/proc/base.c:459 proc_single_show+0xe7/0x150 fs/proc/base.c:761 seq_read+0x4d2/0x1160 fs/seq_file.c:237 do_loop_readv_writev fs/read_write.c:695 [inline] do_loop_readv_writev fs/read_write.c:682 [inline] do_iter_read+0x3e3/0x5a0 fs/read_write.c:919 vfs_readv+0xd3/0x130 fs/read_write.c:981 do_preadv+0x161/0x200 fs/read_write.c:1065 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x45c829 RSP: 002b:00007f1351ea4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 00000000004fa460 RCX: 000000000045c829 RDX: 000000000000037d RSI: 0000000020000500 RDI: 0000000000000006 RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 0000000000000862 R14: 00000000004cb23c R15: 00007f1351ea56d4 The buggy address belongs to the page: page:ffffea000576bfc0 count:0 mapcount:0 mapping: (null) index:0x0 flags: 0x57ffe0000000000() raw: 057ffe0000000000 0000000000000000 0000000000000000 00000000ffffffff raw: 0000000000000000 0000000100000001 0000000000000000 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88815daff880: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88815daff900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff88815daff980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff88815daffa00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff88815daffa80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================