From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4AA02C432BE for ; Mon, 30 Aug 2021 10:51:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2F828610D1 for ; Mon, 30 Aug 2021 10:51:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236436AbhH3Kwg (ORCPT ); Mon, 30 Aug 2021 06:52:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53704 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236337AbhH3Kwe (ORCPT ); Mon, 30 Aug 2021 06:52:34 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0F803C061575 for ; Mon, 30 Aug 2021 03:51:41 -0700 (PDT) From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1630320699; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=/RSN32Fc68vnUkBjhF7yk4nL6Ecg28CKvWg6fH1Afb8=; b=DgC8APdWcPdyCu5Ldzu8bfCy59RdZ61gBbCJI65WTqqDRaBbTwpJJOCxiRCeVX97f/IIQH dFwJKlhjLR4qhSheT81COEvjCYcOSaFnOvZZ9D+Yo6iq1U0ajFvqbF7R3mfrftcY0shCPh 2w/WoTnU2UaFRulJ6s1OgpIuylWlPbjqsmugALh8lhPM6Ab1aR1Gn/iEIhue3CE6Kl42Vf DpWrl5RqwNYrdHgy8WpDfJ5TBuDqzVuUt87+BPuwwxL+XLfjLzkukI90pYaKUOoDHRUsWt 7yRFf6ZPOOB0b3FqmH5NKEHkoVAzyyMRkFrbEHCWN8YDPJJQCKWSjtgpFr5uMg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1630320699; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=/RSN32Fc68vnUkBjhF7yk4nL6Ecg28CKvWg6fH1Afb8=; b=fbCcLlRd4ULBNGXuXvWkAg2PEiFfQyBULPr5a0UBMO5KUiHZ+ilvuLs7aYJs3O8GsNOyUD hBKoV+oS/fnb/TBA== To: syzbot , bp@alien8.de, dwmw@amazon.co.uk, hpa@zytor.com, linux-kernel@vger.kernel.org, mingo@redhat.com, syzkaller-bugs@googlegroups.com, x86@kernel.org, "Paul E. McKenney" Subject: Re: [syzbot] WARNING in rcu_core In-Reply-To: <000000000000d4ba6405cac3b065@google.com> References: <000000000000d4ba6405cac3b065@google.com> Date: Mon, 30 Aug 2021 12:51:39 +0200 Message-ID: <87eeabgq84.ffs@tglx> MIME-Version: 1.0 Content-Type: text/plain Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Aug 30 2021 at 02:45, syzbot wrote: Cc+ Paul > Hello, > > syzbot found the following issue on: > > HEAD commit: 77dd11439b86 Merge tag 'drm-fixes-2021-08-27' of git://ano.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=12018abd300000 > kernel config: https://syzkaller.appspot.com/x/.config?x=2fd902af77ff1e56 > dashboard link: https://syzkaller.appspot.com/bug?extid=f2ceae48bb0c0ab08b9d > compiler: Debian clang version 11.0.1-2, GNU ld (GNU Binutils for Debian) 2.35.1 > > 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+f2ceae48bb0c0ab08b9d@syzkaller.appspotmail.com > > ------------[ cut here ]------------ > ODEBUG: active_state not available (active state 0) object type: rcu_head hint: 0x0 > WARNING: CPU: 0 PID: 8442 at lib/debugobjects.c:508 debug_print_object lib/debugobjects.c:505 [inline] > WARNING: CPU: 0 PID: 8442 at lib/debugobjects.c:508 debug_object_active_state+0x28a/0x410 lib/debugobjects.c:946 > Modules linked in: > CPU: 0 PID: 8442 Comm: syz-executor.2 Not tainted 5.14.0-rc7-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > RIP: 0010:debug_print_object lib/debugobjects.c:505 [inline] > RIP: 0010:debug_object_active_state+0x28a/0x410 lib/debugobjects.c:946 > Code: e8 fb c6 be fd 4c 8b 45 00 48 c7 c7 c0 a2 93 8a 48 c7 c6 60 9f 93 8a 48 c7 c2 00 a5 93 8a 31 c9 49 89 d9 31 c0 e8 16 58 41 fd <0f> 0b e9 9f 00 00 00 45 31 f6 ff 05 66 bd 9d 0c 43 8a 04 2f 84 c0 > RSP: 0018:ffffc90000007ba0 EFLAGS: 00010246 > RAX: b9c220867f01ad00 RBX: 0000000000000000 RCX: ffff88801b5b0000 > RDX: 0000000080000101 RSI: 0000000080000101 RDI: 0000000000000000 > RBP: ffffffff8a304d00 R08: ffffffff81664f72 R09: ffffed1017383f2c > R10: ffffed1017383f2c R11: 0000000000000000 R12: ffff888000137e18 > R13: dffffc0000000000 R14: 1ffff11000026fc3 R15: ffff88805ec97ba0 > FS: 0000000002131400(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 000000001ffffc00 CR3: 00000000505bb000 CR4: 00000000001526f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > > debug_rcu_head_unqueue kernel/rcu/rcu.h:185 [inline] > rcu_do_batch kernel/rcu/tree.c:2543 [inline] > rcu_core+0x8a6/0x14b0 kernel/rcu/tree.c:2785 > __do_softirq+0x372/0x783 kernel/softirq.c:558 > invoke_softirq kernel/softirq.c:432 [inline] > __irq_exit_rcu+0x21b/0x260 kernel/softirq.c:636 > irq_exit_rcu+0x5/0x20 kernel/softirq.c:648 > sysvec_apic_timer_interrupt+0x91/0xb0 arch/x86/kernel/apic/apic.c:1100 > > asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 > RIP: 0010:finish_lock_switch+0xf0/0x1c0 kernel/sched/core.c:4436 > Code: 61 0c 00 74 11 48 89 df be ff ff ff ff e8 18 33 80 08 85 c0 74 27 4d 85 ff 75 44 4c 89 f7 e8 a7 dd 82 08 e8 f2 40 2d 00 fb 5b <41> 5c 41 5d 41 5e 41 5f 5d c3 0f 0b 4d 85 ff 75 92 eb a8 0f 0b 4d > RSP: 0018:ffffc9000167fa30 EFLAGS: 00000282 > RAX: b9c220867f01ad00 RBX: ffff8880902a54f4 RCX: ffffffff9070c703 > RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000000 > RBP: 1ffff1101738a400 R08: ffffffff8186a520 R09: ffffed101738a2a9 > R10: ffffed101738a2a9 R11: 0000000000000000 R12: ffff8880b9c52000 > R13: dffffc0000000000 R14: ffff8880b9c51540 R15: 0000000000000000 > finish_task_switch+0x140/0x630 kernel/sched/core.c:4553 > context_switch kernel/sched/core.c:4684 [inline] > __schedule+0xc0f/0x11f0 kernel/sched/core.c:5938 > schedule+0x14b/0x210 kernel/sched/core.c:6017 > freezable_schedule include/linux/freezer.h:172 [inline] > do_nanosleep+0x1b6/0x7b0 kernel/time/hrtimer.c:1896 > hrtimer_nanosleep+0x239/0x470 kernel/time/hrtimer.c:1949 > __do_sys_clock_nanosleep kernel/time/posix-timers.c:1267 [inline] > __se_sys_clock_nanosleep kernel/time/posix-timers.c:1245 [inline] > __x64_sys_clock_nanosleep+0x344/0x3d0 kernel/time/posix-timers.c:1245 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x44/0xae > RIP: 0033:0x48a7c1 > Code: 24 0c 89 3c 24 48 89 4c 24 18 e8 aa e7 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 8b 74 24 0c 8b 3c 24 b8 e6 00 00 00 0f 05 <44> 89 c7 48 89 04 24 e8 e3 e7 ff ff 48 8b 04 24 eb 97 66 2e 0f 1f > RSP: 002b:00007ffe3a1cf3e0 EFLAGS: 00000293 ORIG_RAX: 00000000000000e6 > RAX: ffffffffffffffda RBX: 00000000000019ce RCX: 000000000048a7c1 > RDX: 00007ffe3a1cf420 RSI: 0000000000000000 RDI: 0000000000000000 > RBP: 00007ffe3a1cf4bc R08: 0000000000000000 R09: 0000000000000010 > R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000032 > R13: 00000000001f8f0a R14: 000000000000000b R15: 00007ffe3a1cf520 > ---------------- > Code disassembly (best guess), 1 bytes skipped: > 0: 0c 00 or $0x0,%al > 2: 74 11 je 0x15 > 4: 48 89 df mov %rbx,%rdi > 7: be ff ff ff ff mov $0xffffffff,%esi > c: e8 18 33 80 08 callq 0x8803329 > 11: 85 c0 test %eax,%eax > 13: 74 27 je 0x3c > 15: 4d 85 ff test %r15,%r15 > 18: 75 44 jne 0x5e > 1a: 4c 89 f7 mov %r14,%rdi > 1d: e8 a7 dd 82 08 callq 0x882ddc9 > 22: e8 f2 40 2d 00 callq 0x2d4119 > 27: fb sti > 28: 5b pop %rbx > * 29: 41 5c pop %r12 <-- trapping instruction > 2b: 41 5d pop %r13 > 2d: 41 5e pop %r14 > 2f: 41 5f pop %r15 > 31: 5d pop %rbp > 32: c3 retq > 33: 0f 0b ud2 > 35: 4d 85 ff test %r15,%r15 > 38: 75 92 jne 0xffffffcc > 3a: eb a8 jmp 0xffffffe4 > 3c: 0f 0b ud2 > 3e: 4d rex.WRB > > > --- > 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@googlegroups.com. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot.