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SubjectWARNING in cgroup_apply_control_enable
From
Hello,

syzbot found the following crash on:

HEAD commit: 7f93d1295131 Merge git://git.kernel.org/pub/scm/linux/kern..
git tree: bpf
console output: https://syzkaller.appspot.com/x/log.txt?x=11bc56d0400000
kernel config: https://syzkaller.appspot.com/x/.config?x=2ca6c7a31d407f86
dashboard link: https://syzkaller.appspot.com/bug?extid=5493b2a54d31d6aea629
compiler: gcc (GCC) 8.0.1 20180413 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+5493b2a54d31d6aea629@syzkaller.appspotmail.com

WARNING: CPU: 0 PID: 22094 at kernel/cgroup/cgroup.c:2928
cgroup_apply_control_enable+0x22c/0xe90 kernel/cgroup/cgroup.c:2928
Kernel panic - not syncing: panic_on_warn set ...

CPU: 0 PID: 22094 Comm: syz-executor7 Not tainted 4.18.0-rc3+ #3
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+0x1c9/0x2b4 lib/dump_stack.c:113
panic+0x238/0x4e7 kernel/panic.c:184
__warn.cold.8+0x163/0x1ba kernel/panic.c:536
report_bug+0x252/0x2d0 lib/bug.c:186
fixup_bug arch/x86/kernel/traps.c:178 [inline]
do_error_trap+0x1fc/0x4d0 arch/x86/kernel/traps.c:296
do_invalid_op+0x1b/0x20 arch/x86/kernel/traps.c:316
invalid_op+0x14/0x20 arch/x86/entry/entry_64.S:992
RIP: 0010:cgroup_apply_control_enable+0x22c/0xe90
kernel/cgroup/cgroup.c:2928
Code: 48 c1 e8 03 42 80 3c 20 00 0f 85 15 0a 00 00 49 8b 5f 18 31 ff 83 e3
02 48 89 de e8 3e 56 07 00 48 85 db 74 07 e8 04 55 07 00 <0f> 0b e8 fd 54
07 00 48 8b 85 a0 fe ff ff 48 c1 e8 03 42 80 3c 20
RSP: 0018:ffff8801b22ff808 EFLAGS: 00010216
RAX: 0000000000040000 RBX: 0000000000000002 RCX: ffffc90003c5b000
RDX: 00000000000001cd RSI: ffffffff8174b6cc RDI: 0000000000000007
RBP: ffff8801b22ff9b8 R08: ffff88019bd26340 R09: ffffed003b5c46d6
R10: ffffed003b5c46d6 R11: ffff8801dae236b3 R12: dffffc0000000000
R13: ffffffff88fb9720 R14: 000000000000000b R15: ffff8801bd42e7c0
cgroup_apply_control+0x1f/0x50 kernel/cgroup/cgroup.c:3014
cgroup_enable_threaded kernel/cgroup/cgroup.c:3226 [inline]
cgroup_type_write+0x3bb/0x580 kernel/cgroup/cgroup.c:3267
cgroup_file_write+0x31f/0x840 kernel/cgroup/cgroup.c:3447
kernfs_fop_write+0x2ba/0x480 fs/kernfs/file.c:316
__vfs_write+0x117/0x9f0 fs/read_write.c:485
vfs_write+0x1f8/0x560 fs/read_write.c:549
ksys_write+0x101/0x260 fs/read_write.c:598
__do_sys_write fs/read_write.c:610 [inline]
__se_sys_write fs/read_write.c:607 [inline]
__x64_sys_write+0x73/0xb0 fs/read_write.c:607
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455e29
Code: 1d ba 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 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f39d14d7c68 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f39d14d86d4 RCX: 0000000000455e29
RDX: 0000000000000009 RSI: 0000000020000180 RDI: 0000000000000016
RBP: 000000000072bea0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004c2eae R14: 00000000004d4ca8 R15: 0000000000000000
Dumping ftrace buffer:
(ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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syzbot will keep track of this bug report. See:
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