================================================================== BUG: KASAN: out-of-bounds in get_reg arch/x86/kernel/unwind_orc.c:399 [inline] BUG: KASAN: out-of-bounds in unwind_next_frame+0x168c/0x1f30 arch/x86/kernel/unwind_orc.c:569 Read of size 8 at addr ffff8881ef14fad8 by task syz-executor.3/15455 CPU: 1 PID: 15455 Comm: syz-executor.3 Not tainted 5.4.85-syzkaller-00225-gb69d75c07de5 #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+0x1dd/0x24e lib/dump_stack.c:118 print_address_description+0x96/0x640 mm/kasan/report.c:374 __kasan_report+0x177/0x1f0 mm/kasan/report.c:506 kasan_report+0x30/0x60 mm/kasan/common.c:634 get_reg arch/x86/kernel/unwind_orc.c:399 [inline] unwind_next_frame+0x168c/0x1f30 arch/x86/kernel/unwind_orc.c:569 arch_stack_walk+0x114/0x140 arch/x86/kernel/stacktrace.c:25 stack_trace_save_tsk+0x17c/0x270 kernel/stacktrace.c:151 proc_pid_stack+0x12f/0x1f0 fs/proc/base.c:455 proc_single_show+0xd3/0x120 fs/proc/base.c:757 seq_read+0x4aa/0xd30 fs/seq_file.c:229 do_loop_readv_writev fs/read_write.c:714 [inline] do_iter_read+0x43b/0x550 fs/read_write.c:935 vfs_readv fs/read_write.c:997 [inline] do_preadv+0x20d/0x350 fs/read_write.c:1089 do_syscall_64+0xcb/0x150 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45e299 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fc291019c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 000000000045e299 RDX: 0000000000000375 RSI: 00000000200017c0 RDI: 0000000000000003 RBP: 000000000119c078 R08: 0000000002000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000119c034 R13: 00007ffd40b00f6f R14: 00007fc29101a9c0 R15: 000000000119c034 The buggy address belongs to the page: page:ffffea0007bc53c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0x8000000000000000() raw: 8000000000000000 0000000000000000 ffffea0007bc5388 0000000000000000 raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8881ef14f980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881ef14fa00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff8881ef14fa80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ^ ffff8881ef14fb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff8881ef14fb80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================