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SubjectRe: WARNING: kernel stack frame pointer has bad value (2)
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syzbot has found a reproducer for the following crash on:

HEAD commit: 28619527b8a7 Merge git://git.kernel.org/pub/scm/linux/kern..
git tree: bpf
console output: https://syzkaller.appspot.com/x/log.txt?x=14800f0a400000
kernel config: https://syzkaller.appspot.com/x/.config?x=8f59875069d721b6
dashboard link: https://syzkaller.appspot.com/bug?extid=903cdd6bce9a6eb832a4
compiler: gcc (GCC) 8.0.1 20180413 (experimental)
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16a79cbe400000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=172a3d01400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+903cdd6bce9a6eb832a4@syzkaller.appspotmail.com

00000000d154fefb: 000000000044a069 (0x44a069)
000000006f318b9e: 0000000000000033 (0x33)
000000007d449f84: 0000000000000246 (0x246)
00000000e7603b48: 00007f129ff8fce8 (0x7f129ff8fce8)
00000000187b73f3: 000000000000002b (0x2b)
WARNING: kernel stack frame pointer at 00000000c37350d4 in
syz-executor951:10824 has bad value 00000000530130ef

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