Hi Jon, See my inline comment …
Regards, Hoang From: Jon Maloy <jma...@redhat.com> Sent: Wednesday, December 9, 2020 5:22 PM To: Hoang Huu Le <hoang.h...@dektech.com.au> Cc: tipc-discussion@lists.sourceforge.net; tipc-dek <tipc-...@dektech.com.au> Subject: Fwd: BUG: rwlock bad magic on CPU, kworker/0:LINE/NUM, ADDR Hi Hoang, This was the one I had in mind. To me it looks like we still have a problem. ///jon -------- Forwarded Message -------- Subject: Re: BUG: rwlock bad magic on CPU, kworker/0:LINE/NUM, ADDR Date: Mon, 30 Nov 2020 12:35:30 +0100 From: Dmitry Vyukov <dvyu...@google.com><mailto:dvyu...@google.com> To: syzbot <syzbot+cb987a9c796abc570...@syzkaller.appspotmail.com><mailto:syzbot+cb987a9c796abc570...@syzkaller.appspotmail.com> CC: David Miller <da...@davemloft.net><mailto:da...@davemloft.net>, jma...@redhat.com<mailto:jma...@redhat.com>, Jakub Kicinski <k...@kernel.org><mailto:k...@kernel.org>, LKML <linux-ker...@vger.kernel.org><mailto:linux-ker...@vger.kernel.org>, netdev <net...@vger.kernel.org><mailto:net...@vger.kernel.org>, syzkaller-bugs <syzkaller-b...@googlegroups.com><mailto:syzkaller-b...@googlegroups.com>, tipc-discussion@lists.sourceforge.net<mailto:tipc-discussion@lists.sourceforge.net>, Ying Xue <ying....@windriver.com><mailto:ying....@windriver.com> On Mon, Nov 30, 2020 at 12:33 PM syzbot <syzbot+cb987a9c796abc570...@syzkaller.appspotmail.com><mailto:syzbot+cb987a9c796abc570...@syzkaller.appspotmail.com> wrote: Hello, syzbot found the following issue on: HEAD commit: 90cf87d1 enetc: Let the hardware auto-advance the taprio b.. git tree: net console output: https://syzkaller.appspot.com/x/log.txt?x=135479b3500000 kernel config: https://syzkaller.appspot.com/x/.config?x=5720c06118e6c4cc dashboard link: https://syzkaller.appspot.com/bug?extid=cb987a9c796abc570b47 compiler: gcc (GCC) 10.1.0-syz 20200507 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+cb987a9c796abc570...@syzkaller.appspotmail.com<mailto:syzbot+cb987a9c796abc570...@syzkaller.appspotmail.com> tipc: 32-bit node address hash set to aa1414ac BUG: rwlock bad magic on CPU#0, kworker/0:18/18158, 00000000859f2a8d CPU: 0 PID: 18158 Comm: kworker/0:18 Not tainted 5.10.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events tipc_net_finalize_work Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x107/0x163 lib/dump_stack.c:118 rwlock_bug kernel/locking/spinlock_debug.c:144 [inline] debug_write_lock_before kernel/locking/spinlock_debug.c:182 [inline] do_raw_write_lock+0x1ef/0x280 kernel/locking/spinlock_debug.c:206 tipc_mon_reinit_self+0x1f7/0x630 net/tipc/monitor.c:685 [Hoang] This is new too me. I will take a look. There was also "general protection fault in tipc_mon_reinit_self": https://syzkaller.appspot.com/bug?id=dc141b9a05cb48d3d9b46837bc2fdc9e7d95dbe9 which also happened once. Smells like an intricate race condition. [Hoang] I guess the race condition already fixed in v5.10. tipc_net_finalize net/tipc/net.c:134 [inline] tipc_net_finalize+0x1df/0x310 net/tipc/net.c:125 process_one_work+0x933/0x15a0 kernel/workqueue.c:2272 worker_thread+0x64c/0x1120 kernel/workqueue.c:2418 kthread+0x3af/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 --- 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 syzkal...@googlegroups.com<mailto:syzkal...@googlegroups.com>. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. -- 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+unsubscr...@googlegroups.com<mailto:syzkaller-bugs+unsubscr...@googlegroups.com>. To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/0000000000004e5bdb05b5516009%40google.com. _______________________________________________ tipc-discussion mailing list tipc-discussion@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/tipc-discussion
