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BUG: KASAN: out-of-bounds in unwind_next_frame+0x1346/0x2230 arch/x86/kernel/unwind_orc.c:541
Read of size 8 at addr ffff8881944d79e8 by task syz-executor.5/25267

CPU: 1 PID: 25267 Comm: syz-executor.5 Not tainted 5.4.40-syzkaller-00120-g228c59bb379b #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+0x14a/0x1ce lib/dump_stack.c:118
 print_address_description+0x93/0x620 mm/kasan/report.c:374
 __kasan_report+0x16d/0x1e0 mm/kasan/report.c:506
 kasan_report+0x34/0x60 mm/kasan/common.c:634
 unwind_next_frame+0x1346/0x2230 arch/x86/kernel/unwind_orc.c:541
 arch_stack_walk+0xf4/0x120 arch/x86/kernel/stacktrace.c:25
 stack_trace_save_tsk+0x2e7/0x490 kernel/stacktrace.c:151
 proc_pid_stack+0x12f/0x1f0 fs/proc/base.c:455
 proc_single_show+0xd3/0x130 fs/proc/base.c:757
 seq_read+0x4aa/0xd30 fs/seq_file.c:229
 do_loop_readv_writev fs/read_write.c:717 [inline]
 do_iter_read+0x43b/0x550 fs/read_write.c:938
 vfs_readv fs/read_write.c:1000 [inline]
 do_preadv+0x213/0x350 fs/read_write.c:1092
 do_syscall_64+0xcb/0x150 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45c829
Code: 0d b7 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 b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fb5cf23cc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00000000004fa460 RCX: 000000000045c829
RDX: 000000000000037d RSI: 0000000020000500 RDI: 0000000000000007
RBP: 000000000078bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000862 R14: 00000000004cb23c R15: 00007fb5cf23d6d4

The buggy address belongs to the page:
page:ffffea00065135c0 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x8000000000000000()
raw: 8000000000000000 0000000000000000 ffffea0006513588 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881944d7880: 00 00 00 00 00 00 00 00 f1 f1 f1 f1 00 f3 f3 f3
 ffff8881944d7900: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881944d7980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
                                                          ^
 ffff8881944d7a00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881944d7a80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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