audit: type=1800 audit(1666203698.331:25): pid=20256 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="syz-executor.4" name=".log" dev="sda1" ino=15046 res=0
==================================================================
BUG: KASAN: stack-out-of-bounds in user_mode arch/x86/include/asm/ptrace.h:131 [inline]
BUG: KASAN: stack-out-of-bounds in unwind_next_frame+0x10a0/0x1400 arch/x86/kernel/unwind_orc.c:410
Read of size 8 at addr ffff888045bc7c80 by task syz-executor.2/20211

CPU: 0 PID: 20211 Comm: syz-executor.2 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
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
 user_mode arch/x86/include/asm/ptrace.h:131 [inline]
 unwind_next_frame+0x10a0/0x1400 arch/x86/kernel/unwind_orc.c:410
 __save_stack_trace+0x9f/0x190 arch/x86/kernel/stacktrace.c:44
 save_stack_trace_tsk+0x9c/0xf0 arch/x86/kernel/stacktrace.c:76
 proc_pid_stack+0x202/0x350 fs/proc/base.c:456
 proc_single_show+0xeb/0x170 fs/proc/base.c:755
 seq_read+0x4e0/0x11c0 fs/seq_file.c:232
 do_loop_readv_writev fs/read_write.c:701 [inline]
 do_loop_readv_writev fs/read_write.c:688 [inline]
 do_iter_read+0x471/0x630 fs/read_write.c:925
 vfs_readv+0xe5/0x150 fs/read_write.c:987
 do_preadv fs/read_write.c:1071 [inline]
 __do_sys_preadv fs/read_write.c:1121 [inline]
 __se_sys_preadv fs/read_write.c:1116 [inline]
 __x64_sys_preadv+0x22b/0x310 fs/read_write.c:1116
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fbceb39e5a9
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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fbce9d11168 EFLAGS: 00000246 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00007fbceb4bef80 RCX: 00007fbceb39e5a9
RDX: 0000000000000218 RSI: 00000000200017c0 RDI: 0000000000000004
RBP: 00007fbceb3f9580 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc2dd9f31f R14: 00007fbce9d11300 R15: 0000000000022000

The buggy address belongs to the page:
page:ffffea000116f1c0 count:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0xfff00000000000()
raw: 00fff00000000000 0000000000000000 ffffffff01160101 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888045bc7b80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888045bc7c00: 00 00 f1 f1 f1 f1 f1 f1 04 f2 04 f2 04 f2 00 00
>ffff888045bc7c80: f2 f2 00 00 00 f2 f2 f2 f2 f2 00 00 00 f2 f2 f2
                   ^
 ffff888045bc7d00: f2 f2 00 00 f3 f3 00 00 00 00 00 00 00 00 00 00
 ffff888045bc7d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================