From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EC0BE1A2387; Wed, 18 Dec 2024 16:15:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734538507; cv=none; b=VWN4qMe6bcYW9gfDqdomxrfUgTSyaecd3rUDWA6H/JV4lqCzxGehlxtYHah4M8lO9xY5rjlZxNa/NdOkHdXONMaPgbzjI4nWG6jX0tDG2FBi5bxkGetZ92E/OZS1KkzYhRsDVhs6g7yTi9KisrYkRcuSUrQ1PIlGEpTRUxH4gAc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1734538507; c=relaxed/simple; bh=g0fOQUUIbndCm9J06Y/2BKrBaHwMEMu3jJD89HXmYAs=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=CNg92XGZrBo5AxaTONn3QB0X/jfROrSwkGq0WWzhPXSbsF0GPVERqVxJIIrh0KdrE9u8Ktowsd8Rs7lATOrhb/YUz+GwF3/gpCIAwhlmyCxBDmUvB+5+aPh50WaD99o17ing38DedvDnT5ePO86UWUmjdpvEU5SWPpHqhOsHI8U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0CB5CC4CECD; Wed, 18 Dec 2024 16:15:05 +0000 (UTC) Date: Wed, 18 Dec 2024 11:15:43 -0500 From: Steven Rostedt To: syzbot Cc: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, mathieu.desnoyers@efficios.com, mhiramat@kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [trace?] WARNING in tracepoint_probe_unregister (3) Message-ID: <20241218111543.5e0ef7b0@gandalf.local.home> In-Reply-To: <67629485.050a0220.29fcd0.008b.GAE@google.com> References: <6761e9b5.050a0220.29fcd0.007b.GAE@google.com> <67629485.050a0220.29fcd0.008b.GAE@google.com> X-Mailer: Claws Mail 3.20.0git84 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: linux-trace-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Wed, 18 Dec 2024 01:23:17 -0800 syzbot wrote: > syzbot has found a reproducer for the following issue on: It only found a reproducer when it introduces faults. Again, this needs to report that faults were injected, because I can guarantee that this would never reproduce any bug if you do not inject faults. The fault is a requirement for the warning to happen. Come back to me when you can reproduce it without fault injection. -- Steve > > HEAD commit: aef25be35d23 hexagon: Disable constant extender optimizati.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=10b2cb44580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=c22efbd20f8da769 > dashboard link: https://syzkaller.appspot.com/bug?extid=a1d25e53cd4a10f7f2d3 > compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=175342df980000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=17140cf8580000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/aa655a321f64/disk-aef25be3.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/222a3010db12/vmlinux-aef25be3.xz > kernel image: https://storage.googleapis.com/syzbot-assets/7eab659ce042/bzImage-aef25be3.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+a1d25e53cd4a10f7f2d3@syzkaller.appspotmail.com > > ------------[ cut here ]------------ > WARNING: CPU: 1 PID: 5829 at kernel/tracepoint.c:358 tracepoint_remove_func kernel/tracepoint.c:358 [inline] > WARNING: CPU: 1 PID: 5829 at kernel/tracepoint.c:358 tracepoint_probe_unregister+0x894/0xd70 kernel/tracepoint.c:504 > Modules linked in: > CPU: 1 UID: 0 PID: 5829 Comm: syz-executor241 Not tainted 6.13.0-rc3-syzkaller-00044-gaef25be35d23 #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/25/2024 > RIP: 0010:tracepoint_remove_func kernel/tracepoint.c:358 [inline] > RIP: 0010:tracepoint_probe_unregister+0x894/0xd70 kernel/tracepoint.c:504 > Code: 41 5e 41 5f c3 cc cc cc cc e8 68 27 fe ff 48 c7 c6 60 16 9b 81 48 89 df e8 49 52 e5 ff eb 9f bb fe ff ff ff e8 4d 27 fe ff 90 <0f> 0b 90 eb 91 e8 42 27 fe ff 48 89 da 48 b8 00 00 00 00 00 fc ff > RSP: 0018:ffffc90003e0f898 EFLAGS: 00010293 > RAX: 0000000000000000 RBX: 00000000fffffffe RCX: ffffffff819b24ff > RDX: ffff88802f9c1e00 RSI: ffffffff819b27a3 RDI: 0000000000000005 > RBP: ffffffff8ecbca40 R08: 0000000000000005 R09: 0000000000000000 > R10: 0000000000000001 R11: 0000000000000003 R12: ffffffff81a0eb30 > R13: 0000000000000402 R14: 0000000000000002 R15: ffffffff8de3fcd8 > FS: 000055556e1df380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000020000100 CR3: 00000000763aa000 CR4: 00000000003526f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > > unregister_trace_sched_switch include/trace/events/sched.h:222 [inline] > tracing_sched_unregister kernel/trace/trace_sched_switch.c:87 [inline] > tracing_stop_sched_switch kernel/trace/trace_sched_switch.c:129 [inline] > tracing_stop_cmdline_record+0x66/0xa0 kernel/trace/trace_sched_switch.c:140 > __ftrace_event_enable_disable+0x73f/0x850 kernel/trace/trace_events.c:645 > ftrace_event_enable_disable kernel/trace/trace_events.c:730 [inline] > ftrace_clear_events kernel/trace/trace_events.c:739 [inline] > ftrace_event_set_open+0x238/0x2d0 kernel/trace/trace_events.c:2270 > do_dentry_open+0xf59/0x1ea0 fs/open.c:945 > vfs_open+0x82/0x3f0 fs/open.c:1075 > do_open fs/namei.c:3828 [inline] > path_openat+0x1e6a/0x2d60 fs/namei.c:3987 > do_filp_open+0x20c/0x470 fs/namei.c:4014 > do_sys_openat2+0x17a/0x1e0 fs/open.c:1402 > do_sys_open fs/open.c:1417 [inline] > __do_sys_openat fs/open.c:1433 [inline] > __se_sys_openat fs/open.c:1428 [inline] > __x64_sys_openat+0x175/0x210 fs/open.c:1428 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7efe2dcdd6e9 > Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 a1 1a 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007ffd6660cd18 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 > RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007efe2dcdd6e9 > RDX: 0000000000020201 RSI: 0000000020000100 RDI: ffffffffffffff9c > RBP: 0000000000010bb4 R08: 0000000000000000 R09: 00000000000000a0 > R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffd6660cd2c > R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001 > > > > --- > If you want syzbot to run the reproducer, reply with: > #syz test: git://repo/address.git branch-or-commit-hash > If you attach or paste a git patch, syzbot will apply it before testing.