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Message-ID: <000000000000e9239405cc374d5c@google.com>
Date: Fri, 17 Sep 2021 14:06:25 -0700
From: syzbot <syzbot+df709157a4ecaf192b03@...kaller.appspotmail.com>
To: andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org,
cgroups@...r.kernel.org, christian@...uner.io,
daniel@...earbox.net, hannes@...xchg.org, john.fastabend@...il.com,
kafai@...com, kpsingh@...nel.org, linux-kernel@...r.kernel.org,
lizefan.x@...edance.com, netdev@...r.kernel.org,
songliubraving@...com, syzkaller-bugs@...glegroups.com,
tj@...nel.org, yhs@...com
Subject: [syzbot] general protection fault in cgroup_sk_free
Hello,
syzbot found the following issue on:
HEAD commit: 7366c23ff492 ptp: dp83640: don't define PAGE0
git tree: net
console output: https://syzkaller.appspot.com/x/log.txt?x=15af7951300000
kernel config: https://syzkaller.appspot.com/x/.config?x=c31c0936547df9ea
dashboard link: https://syzkaller.appspot.com/bug?extid=df709157a4ecaf192b03
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12f2b28d300000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1656e7c7300000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+df709157a4ecaf192b03@...kaller.appspotmail.com
general protection fault, probably for non-canonical address 0xdffffc0000000182: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000c10-0x0000000000000c17]
CPU: 0 PID: 10393 Comm: syz-executor023 Not tainted 5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__ref_is_percpu include/linux/percpu-refcount.h:174 [inline]
RIP: 0010:percpu_ref_put_many include/linux/percpu-refcount.h:319 [inline]
RIP: 0010:percpu_ref_put include/linux/percpu-refcount.h:338 [inline]
RIP: 0010:cgroup_bpf_put include/linux/cgroup.h:926 [inline]
RIP: 0010:cgroup_sk_free+0x8d/0x570 kernel/cgroup/cgroup.c:6613
Code: 0e 06 00 40 84 ed 5a 0f 84 42 01 00 00 e8 0b 08 06 00 4c 8d ab 10 0c 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <80> 3c 02 00 0f 85 6f 04 00 00 48 8b ab 10 0c 00 00 31 ff 49 89 ec
RSP: 0018:ffffc9000cef79c0 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000182 RSI: ffffffff81700755 RDI: 0000000000000003
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: ffffffff81700746 R11: 0000000000000000 R12: ffff888017463000
R13: 0000000000000c10 R14: ffffffff8d0d318c R15: ffff888017463060
FS: 0000000000000000(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000080 CR3: 000000000b68e000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
sk_prot_free net/core/sock.c:1852 [inline]
__sk_destruct+0x579/0x900 net/core/sock.c:1943
sk_destruct+0xbd/0xe0 net/core/sock.c:1958
__sk_free+0xef/0x3d0 net/core/sock.c:1969
sk_free+0x78/0xa0 net/core/sock.c:1980
sock_put include/net/sock.h:1815 [inline]
nr_release+0x392/0x450 net/netrom/af_netrom.c:554
__sock_release+0xcd/0x280 net/socket.c:649
sock_close+0x18/0x20 net/socket.c:1314
__fput+0x288/0x9f0 fs/file_table.c:280
task_work_run+0xdd/0x1a0 kernel/task_work.c:164
exit_task_work include/linux/task_work.h:32 [inline]
do_exit+0xbae/0x2a30 kernel/exit.c:825
do_group_exit+0x125/0x310 kernel/exit.c:922
get_signal+0x47f/0x2160 kernel/signal.c:2868
arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:865
handle_signal_work kernel/entry/common.c:148 [inline]
exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:209
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302
do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x443559
Code: Unable to access opcode bytes at RIP 0x44352f.
RSP: 002b:00007fff3922f8c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002b
RAX: 0000000000000003 RBX: 0000000000000003 RCX: 0000000000443559
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: 0000000000000003 R08: 000000000000000d R09: 000000000000000d
R10: 000000000000000d R11: 0000000000000246 R12: 00000000009db2c0
R13: 0000000000000000 R14: 00000000004b8018 R15: 00000000004004b8
Modules linked in:
----------------
Code disassembly (best guess), 2 bytes skipped:
0: 00 40 84 add %al,-0x7c(%rax)
3: ed in (%dx),%eax
4: 5a pop %rdx
5: 0f 84 42 01 00 00 je 0x14d
b: e8 0b 08 06 00 callq 0x6081b
10: 4c 8d ab 10 0c 00 00 lea 0xc10(%rbx),%r13
17: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
1e: fc ff df
21: 4c 89 ea mov %r13,%rdx
24: 48 c1 ea 03 shr $0x3,%rdx
* 28: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction
2c: 0f 85 6f 04 00 00 jne 0x4a1
32: 48 8b ab 10 0c 00 00 mov 0xc10(%rbx),%rbp
39: 31 ff xor %edi,%edi
3b: 49 89 ec mov %rbp,%r12
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches
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