Messages in this thread | | | From | Dmitry Vyukov <> | Date | Mon, 3 Sep 2018 06:56:19 +0200 | Subject | Re: WARNING: suspicious RCU usage in pid_task |
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On Mon, Jun 25, 2018 at 7:45 PM, syzbot <syzbot+c2d4c3ae3fd90bbaf059@syzkaller.appspotmail.com> wrote: > syzbot has found a reproducer for the following crash on: > > HEAD commit: 6f0d349d922b Merge git://git.kernel.org/pub/scm/linux/kern.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=14c04304400000 > kernel config: https://syzkaller.appspot.com/x/.config?x=a63be0c83e84d370 > dashboard link: https://syzkaller.appspot.com/bug?extid=c2d4c3ae3fd90bbaf059 > compiler: gcc (GCC) 8.0.1 20180413 (experimental) > syzkaller repro:https://syzkaller.appspot.com/x/repro.syz?x=14f0a814400000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16ce574c400000
Probably bpfilter problem, +bpfilter maintainers.
> IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+c2d4c3ae3fd90bbaf059@syzkaller.appspotmail.com > > bpfilter: read fail -512 > > ============================= > WARNING: suspicious RCU usage > 4.18.0-rc2+ #117 Not tainted > ----------------------------- > kernel/pid.c:323 suspicious rcu_dereference_check() usage! > > other info that might help us debug this: > > > rcu_scheduler_active = 2, debug_locks = 1 > 1 lock held by syz-executor106/7744: > #0: 00000000bee82115 (bpfilter_lock){+.+.}, at: > __bpfilter_process_sockopt+0x1c5/0x39b net/bpfilter/bpfilter_kern.c:67 > > stack backtrace: > CPU: 1 PID: 7744 Comm: syz-executor106 Not tainted 4.18.0-rc2+ #117 > 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 > lockdep_rcu_suspicious+0x14a/0x153 kernel/locking/lockdep.c:4562 > pid_task+0x1ce/0x200 kernel/pid.c:322 > shutdown_umh.constprop.0+0x33/0x7c net/bpfilter/bpfilter_kern.c:29 > __stop_umh net/bpfilter/bpfilter_kern.c:41 [inline] > __bpfilter_process_sockopt.cold.1+0x9b/0xa0 net/bpfilter/bpfilter_kern.c:81 > bpfilter_mbox_request+0x4d/0xb0 net/ipv4/bpfilter/sockopt.c:25 > bpfilter_ip_set_sockopt+0x33/0x40 net/ipv4/bpfilter/sockopt.c:31 > ip_setsockopt+0x124/0x140 net/ipv4/ip_sockglue.c:1250 > dccp_setsockopt+0x96/0xf0 net/dccp/proto.c:565 > sock_common_setsockopt+0x9a/0xe0 net/core/sock.c:3040 > __sys_setsockopt+0x1c5/0x3b0 net/socket.c:1947 > __do_sys_setsockopt net/socket.c:1958 [inline] > __se_sys_setsockopt net/socket.c:1955 [inline] > __x64_sys_setsockopt+0xbe/0x150 net/socket.c:1955 > do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 > entry_SYSCALL_64_after_hwframe+0x49/0xbe > RIP: 0033:0x44cdb9 > Code: e8 6c bd 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 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 > 0f 83 cb d2 fb ff c3 66 2e 0f 1f 84 00 00 00 00 > RSP: 002b:00007f63b04a8d18 EFLAGS: 00000246 ORIG_RAX: 0000000000000036 > RAX: ffffffffffffffda RBX: 00000000006dfce4 RCX: 000000000044cdb9 > RDX: 0000000000000040 RSI: 0000000000000000 RDI: 0000000000000027 > RBP: 00000000006dfce0 R08: 0000000000000000 R09: 65732f636f72702f > R10: 0000000020000000 R11: 0000000000000246 R12: 00007f63b04a8d20 > R13: 0100000000000000 R14: 6273752f7665642f R15: 0000000000000034 > > -- > You received this message because you are subscribed to the Google Groups > "syzkaller-bugs" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to syzkaller-bugs+unsubscribe@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/syzkaller-bugs/000000000000f0c659056f7af058%40google.com. > > For more options, visit https://groups.google.com/d/optout.
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