From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f208.google.com (mail-il1-f208.google.com [209.85.166.208]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 626DC19F424 for ; Thu, 2 Jan 2025 10:34:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.208 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1735814063; cv=none; b=BPqPV3o2y/Vuhl+/U5tanMD6IYB46Uc06Lb0JBlXlXiNvFMphuNKbuN0NiS+y6QDzNFTjpN5P6y5vgelZ46otiZKtYVL6RGO54qislZsTcoOOKBTmjPXqGrCgvn8F6++xPMSqcaalKwQI25nTvtNYxzLJIpooHDLMhKtYMbQ3NE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1735814063; c=relaxed/simple; bh=x+xyNxmTQ3tR/NOseyEgmzJlv1X7pimKGWqXCVSAy5I=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; 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List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:19cc:b0:3a7:6e97:9877 with SMTP id e9e14a558f8ab-3c2d5a27dd7mr354105615ab.24.1735814060534; Thu, 02 Jan 2025 02:34:20 -0800 (PST) Date: Thu, 02 Jan 2025 02:34:20 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <67766bac.050a0220.3a8527.0037.GAE@google.com> Subject: [syzbot] [kernel?] INFO: rcu detected stall in try_check_zero (5) From: syzbot To: bp@alien8.de, dave.hansen@linux.intel.com, hpa@zytor.com, linux-kernel@vger.kernel.org, mingo@redhat.com, syzkaller-bugs@googlegroups.com, tglx@linutronix.de, x86@kernel.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 059dd502b263 Merge tag 'block-6.13-20241228' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=11394ac4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=aa8dc22aa6de51f5 dashboard link: https://syzkaller.appspot.com/bug?extid=e671de40c3198d01f2cb 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=11562818580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/27659a620a43/disk-059dd502.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/996b6ce6c350/vmlinux-059dd502.xz kernel image: https://storage.googleapis.com/syzbot-assets/094cd4888c06/bzImage-059dd502.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e671de40c3198d01f2cb@syzkaller.appspotmail.com rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: 0-...!: (2 ticks this GP) idle=bef4/1/0x4000000000000000 softirq=13852/13852 fqs=0 rcu: (detected by 1, t=10502 jiffies, g=8201, q=617 ncpus=2) Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 9 Comm: kworker/0:1 Not tainted 6.13.0-rc4-syzkaller-00078-g059dd502b263 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Workqueue: rcu_gp process_srcu RIP: 0010:mark_usage kernel/locking/lockdep.c:4637 [inline] RIP: 0010:__lock_acquire+0x12c6/0x3c40 kernel/locking/lockdep.c:5180 Code: ff 65 8b 05 24 fe 8b 7e 85 c0 0f 85 d7 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 7c 24 40 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 09 84 d2 74 05 e8 e4 36 86 00 RSP: 0018:ffffc90000007b38 EFLAGS: 00000803 RAX: dffffc0000000000 RBX: ffff88801c6b53fa RCX: 1ffffffff2dd8c62 RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff88801c6b5344 RBP: 0000000000000049 R08: 0000000000000000 R09: fffffbfff2dca3bd R10: ffffffff96e51def R11: 0000000000000004 R12: ffff88801c6b53d1 R13: ffff88801c6b4880 R14: 0000000000000003 R15: ffff88801c6b53d8 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000600 CR3: 000000002d36e000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849 __raw_spin_lock include/linux/spinlock_api_smp.h:133 [inline] _raw_spin_lock+0x2e/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:351 [inline] advance_sched+0xd8/0xc60 net/sched/sch_taprio.c:924 __run_hrtimer kernel/time/hrtimer.c:1739 [inline] __hrtimer_run_queues+0x20a/0xae0 kernel/time/hrtimer.c:1803 hrtimer_interrupt+0x392/0x8e0 kernel/time/hrtimer.c:1865 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1038 [inline] __sysvec_apic_timer_interrupt+0x10f/0x400 arch/x86/kernel/apic/apic.c:1055 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] sysvec_apic_timer_interrupt+0x9f/0xc0 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:26 [inline] RIP: 0010:preempt_latency_start kernel/sched/core.c:5828 [inline] RIP: 0010:preempt_count_add+0x52/0x150 kernel/sched/core.c:5854 Code: 3d 1b 6b 9b 7e 0f b6 14 11 38 d0 7c 08 84 d2 0f 85 dd 00 00 00 8b 15 9d 5a 1c 19 85 d2 75 0b 65 8b 05 fa 6a 9b 7e 3c f4 77 6b <65> 8b 05 ef 6a 9b 7e 25 ff ff ff 7f 39 c3 74 07 5b 5d c3 cc cc cc RSP: 0018:ffffc900000e7b20 EFLAGS: 00000213 RAX: 0000000080000001 RBX: 0000000000000001 RCX: 1ffffffff3509914 RDX: 0000000000000000 RSI: ffffffff8bd1ed20 RDI: 0000000000000001 RBP: 00000051629f0d2a R08: 0000000000000001 R09: ffffed10170e8d59 R10: ffff8880b8746acf R11: 0000000000000002 R12: 0000000000000000 R13: 00000000000036b2 R14: ffffffff9a880640 R15: 000000000000104e delay_tsc+0x3c/0xc0 arch/x86/lib/delay.c:79 udelay include/asm-generic/delay.h:64 [inline] try_check_zero+0x3c6/0x5a0 kernel/rcu/srcutree.c:1112 srcu_advance_state kernel/rcu/srcutree.c:1742 [inline] process_srcu+0x575/0x1720 kernel/rcu/srcutree.c:1851 process_one_work+0x9c5/0x1ba0 kernel/workqueue.c:3229 process_scheduled_works kernel/workqueue.c:3310 [inline] worker_thread+0x6c8/0xf00 kernel/workqueue.c:3391 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g8201 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 rcu: Possible timer handling issue on cpu=0 timer-softirq=5774 rcu: rcu_preempt kthread starved for 10502 jiffies! g8201 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0 rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior. rcu: RCU grace-period kthread stack dump: task:rcu_preempt state:I stack:27600 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0xe58/0x5ad0 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6848 schedule_timeout+0x124/0x280 kernel/time/sleep_timeout.c:99 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2045 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2247 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 --- This report is generated by a bot. 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