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 0DF712F24 for ; Mon, 24 Jun 2024 16:48:20 +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=1719247702; cv=none; b=a7mYZOJ78E4WPILSPNX8uGZtdhF6eVsADmGRhelaxEW828gUtZK4iNQ2KixFa8rit26XqqMyuy2efPYCbOfP8Q/QmITh9wgrhwe4ZTrkyOypXlINsr/uDFMopF7R121qfZub/RVnYZKofwQc4N9LUTNgG8YSDF0u7+nxSwv+Zpo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1719247702; c=relaxed/simple; bh=6/puZW9ESulFXCcGFcPYU/1U0jBX+zaUUNxByq+TKrI=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=m9DoiyZErPPYLO0m7+Z9hC7UzlgJCvWLzJF9UT2KMLIqUos200zHWO80alqlfsgKkcVpZINH7lbq91ZxJxdWrFhe+QkZTfIfmI5Nrf8v/7TTLxTtTL+4x3SYu0q+kb8aQBgxjJ64+5o+kcZfG4oZGr5GlHRJYPAe5+ETIcGSiV8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.208 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-il1-f208.google.com with SMTP id e9e14a558f8ab-37623e47362so60231965ab.3 for ; Mon, 24 Jun 2024 09:48:20 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1719247700; x=1719852500; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=5KGnMYgQ0FwW2GL2AlsrA1DGANOTOl6nsumMDrX6kzw=; b=nZxw8o8tQ9vujvTLV9w9HA+KemV06Bs1lPIEOSSlSWOJKVTsCnsdO6saRNJLvXmBul yUFM2NWpTuiPurvE40ZambImzwGvDZ/p1WX4woTUhqtJ/U/O9qWo1RmIO1zbnYKLEKQj dnjal78YFDYMJtprphmczN5mAdgSgi40il8ynERLCAxnOEalA9dFX3pxJH56nTWBKTu2 nodF19vPAOI/s5ag5uzn82Qy5eY7k+glqixQYTAnxpBYa8rqDD1bSS7xrXC6Nxh/zNo/ Eo02A7FGJZbXP6B6J3e2jyTyo/ifuPTdYCxyRDpz3OVKPK037mkzwsoapZPNu7wgkrZA D5rA== X-Forwarded-Encrypted: i=1; AJvYcCWbpqADKNI5QLcTUUI3C/N/GqVmyV+wIwbntrNecD+NcwmB7YWoMpsyy7kmh7Vl/ExhUFfN0QuG9xxPgTUYMJpdDUTUzl/SVGnSSUIv X-Gm-Message-State: AOJu0Yy+4SP2YHDmyktPJiQTX3ZXHEhLp85sSAwTeZPUMctj0wGPGV2b mqZHIEuHQBlUPq2ayqRTpdh2lci0md6geGg7QgMevmjsBg5Edrn1lMee3P+VjI0sXoqXPZ2DxRk xi7YTWAURZGZcrP2Gf8FIQ5lrjfUTEbdqkvgPiKt0nnGBmPSChg8mRa4= X-Google-Smtp-Source: AGHT+IFMQVz2rzwuYfSXe976jQr7ccTKKPl3QhgieSQPHAni4XAzBRfCV/2pN9py+8U22ryjxc+djuKSoz/uBSx5TSjVY2/rt3Z9 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:138c:b0:374:70ae:e86e with SMTP id e9e14a558f8ab-3763b377a27mr7307435ab.6.1719247700175; Mon, 24 Jun 2024 09:48:20 -0700 (PDT) Date: Mon, 24 Jun 2024 09:48:20 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000733bf2061ba58c4d@google.com> Subject: [syzbot] [kernel?] INFO: rcu detected stall in sys_futex (7) From: syzbot To: andrealmeid@igalia.com, dave@stgolabs.net, dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 66cc544fd75c Merge tag 'dmaengine-fix-6.10' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=16beff56980000 kernel config: https://syzkaller.appspot.com/x/.config?x=f413acf5b1eb4093 dashboard link: https://syzkaller.appspot.com/bug?extid=b66b5182718939fec09b compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/47e71dc016ab/disk-66cc544f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/a291e2654ce5/vmlinux-66cc544f.xz kernel image: https://storage.googleapis.com/syzbot-assets/fcc76e4e2724/bzImage-66cc544f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+b66b5182718939fec09b@syzkaller.appspotmail.com rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: (detected by 1, t=10502 jiffies, g=53573, q=135 ncpus=2) rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4295010993-4295000491), jiffies_till_next_fqs=1, root ->qsmask 0x0 rcu: rcu_preempt kthread starved for 10502 jiffies! g53573 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=1 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:R running task stack:27680 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5408 [inline] __schedule+0xf15/0x5d00 kernel/sched/core.c:6745 __schedule_loop kernel/sched/core.c:6822 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6837 schedule_timeout+0x136/0x2a0 kernel/time/timer.c:2581 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2000 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2202 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: Stack dump where RCU GP kthread last ran: CPU: 1 PID: 10159 Comm: syz-executor.3 Not tainted 6.10.0-rc4-syzkaller-00164-g66cc544fd75c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 RIP: 0010:finish_task_switch.isra.0+0x220/0xcc0 kernel/sched/core.c:5282 Code: a9 0a 00 00 44 8b 0d 37 1f 86 0e 45 85 c9 0f 85 c0 01 00 00 48 89 df e8 ae f8 ff ff e8 69 db 36 00 fb 65 48 8b 1d 40 89 a5 7e <48> 8d bb f8 15 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 RSP: 0018:ffffc9000360f810 EFLAGS: 00000206 RAX: 0000000000527977 RBX: ffff888058c49e00 RCX: 1ffffffff1fc7f31 RDX: 0000000000000000 RSI: ffffffff8b2caf60 RDI: ffffffff8b8ff400 RBP: ffffc9000360f858 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8fe43c17 R11: 0000000000000000 R12: ffff8880b933f938 R13: ffff888058c4da00 R14: 0000000000000000 R15: ffff8880b933ebc0 FS: 00005555718eb480(0000) GS:ffff8880b9300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fd86d7b00c0 CR3: 0000000024a24000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: context_switch kernel/sched/core.c:5411 [inline] __schedule+0xf1d/0x5d00 kernel/sched/core.c:6745 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:7067 irqentry_exit+0x36/0x90 kernel/entry/common.c:354 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:preempt_count_sub+0x63/0x160 kernel/sched/core.c:5909 Code: 56 13 85 c9 75 1b 65 8b 05 b2 4e a6 7e 89 c2 81 e2 ff ff ff 7f 39 d3 7f 17 81 fb fe 00 00 00 76 71 f7 db 65 01 1d 95 4e a6 7e <5b> c3 cc cc cc cc 90 e8 f1 2d 22 03 85 c0 74 51 48 c7 c0 d4 6e e4 RSP: 0018:ffffc9000360fad8 EFLAGS: 00000257 RAX: 0000000000000001 RBX: 00000000ffffffff RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffffffff8b2caf60 RDI: 0000000000000001 RBP: ffffed100b1893c0 R08: 0000000000000000 R09: 0000000000000001 R10: ffffffff8fe43c17 R11: 0000000000000000 R12: ffff888058c49e2c R13: ffff888058c49e00 R14: ffffffff81815241 R15: dffffc0000000000 __schedule_loop kernel/sched/core.c:6823 [inline] schedule+0xf1/0x350 kernel/sched/core.c:6837 futex_wait_queue+0xfc/0x1f0 kernel/futex/waitwake.c:370 __futex_wait+0x291/0x3c0 kernel/futex/waitwake.c:669 futex_wait+0xe9/0x380 kernel/futex/waitwake.c:697 do_futex+0x22b/0x350 kernel/futex/syscalls.c:102 __do_sys_futex kernel/futex/syscalls.c:179 [inline] __se_sys_futex kernel/futex/syscalls.c:160 [inline] __x64_sys_futex+0x1e1/0x4c0 kernel/futex/syscalls.c:160 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: 0033:0x7fd86d67d0a9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffd5114c5a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 000000000009ad9c RCX: 00007fd86d67d0a9 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fd86d7b405c RBP: 000000000009adce R08: 00007fd86e428080 R09: 0000000c00000000 R10: 00007ffd5114c690 R11: 0000000000000246 R12: 00007ffd5114c690 R13: 00007fd86d7b405c R14: 0000000000000032 R15: 00007ffd5114c6b0 --- This report is generated by a bot. 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