linux-kernel - WARNING: kernel stack frame pointer has bad value

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Message-ID: <0000000000004ccb0e056a359f77@google.com>
Date:   Thu, 19 Apr 2018 08:57:01 -0700
From:   syzbot <syzbot+37035ccfa9a0a017ffcf@...kaller.appspotmail.com>
To:     linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: WARNING: kernel stack frame pointer has bad value

Hello,

syzbot hit the following crash on upstream commit
48023102b7078a6674516b1fe0d639669336049d (Fri Apr 13 23:55:41 2018 +0000)
Merge branch 'overlayfs-linus' of  
git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/vfs
syzbot dashboard link:  
https://syzkaller.appspot.com/bug?extid=37035ccfa9a0a017ffcf

So far this crash happened 141 times on net-next, upstream.
C reproducer: https://syzkaller.appspot.com/x/repro.c?id=5871698234572800
syzkaller reproducer:  
https://syzkaller.appspot.com/x/repro.syz?id=5086177975599104
Raw console output:  
https://syzkaller.appspot.com/x/log.txt?id=5110926181138432
Kernel config:  
https://syzkaller.appspot.com/x/.config?id=-8852471259444315113
compiler: gcc (GCC) 8.0.1 20180413 (experimental)

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+37035ccfa9a0a017ffcf@...kaller.appspotmail.com
It will help syzbot understand when the bug is fixed. See footer for  
details.
If you forward the report, please keep this part and the footer.

00000000ed8ccbe7: 0000000000440169 (0x440169)
00000000469f2a79: 0000000000000033 (0x33)
000000004636639d: 0000000000000246 (0x246)
00000000aa65aef8: 00007ffead676158 (0x7ffead676158)
00000000e3ef297c: 000000000000002b (0x2b)
WARNING: kernel stack frame pointer at 000000004832711f in  
syzkaller561281:4479 has bad value 000000006b4f8502
WARNING: kernel stack regs at 0000000089e11b3b in syzkaller561281:4479 has  
bad 'bp' value 00000000f19a2a3b
random: crng init done

---
This bug is generated by a dumb bot. It may contain errors.
See https://goo.gl/tpsmEJ for details.
Direct all questions to syzkaller@...glegroups.com.

syzbot will keep track of this bug report.
If you forgot to add the Reported-by tag, once the fix for this bug is  
merged
into any tree, please reply to this email with:
#syz fix: exact-commit-title
If you want to test a patch for this bug, please reply with:
#syz test: git://repo/address.git branch
and provide the patch inline or as an attachment.
To mark this as a duplicate of another syzbot report, please reply with:
#syz dup: exact-subject-of-another-report
If it's a one-off invalid bug report, please reply with:
#syz invalid
Note: if the crash happens again, it will cause creation of a new bug  
report.
Note: all commands must start from beginning of the line in the email body.