From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f71.google.com (mail-io1-f71.google.com [209.85.166.71]) (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 C576613BC3F for ; Mon, 29 Jul 2024 15:34:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.71 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722267276; cv=none; b=cFeyTiFcOTs4TUY38QyZ8S1BRIlM1J6FRQfprbYIVh/9NbuwdCxgPvd5vMfcSq8M6WYUK7rZf232bhExMrXgack60P/nRwPZIKUsLE+STGOruDE74SYub/Of39xxFEUhnO7NrXBdEL7Ki5DWZsdnZAwQ6z1ZI50FnBK94zhI89k= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722267276; c=relaxed/simple; bh=C6jE+lNy+Ex8wNV6Peh6rSUXi2Qc+66cMcxevlfaqss=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=Amk9XFarUWX+QUI61LloBtxs19vVd5OLeqOYOr6jIkRXDDaKFNH0kX0YsdD1IahSYI+uy/4M7lbHWyJAm0r0UAu4J5oGNrNKCGJH+RXB5nzT0e67dcDkWfNomZFHfktfStzVHZPkNpu0gkJG7Dv5RTgmdoHXdX7JWoOguve60jQ= 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=209.85.166.71 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-io1-f71.google.com with SMTP id ca18e2360f4ac-81faf98703eso85432039f.3 for ; Mon, 29 Jul 2024 08:34:34 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1722267274; x=1722872074; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=4PaIqU/2uBy+ZAxWZ54s5YgdkQoW4i4kl+6wzW7i4bI=; b=sNicQcfNLHES9cRRv33Kl/Bc7OU1ZZUEgVX3yEnPf/EwbU3E+15G1AGX7yMbtcjmvB N0Q+vZyKEDZBZlF+AAKysQLI1z6B/OlO5PMmyPY/Jx6+Ny1H6A0yaSreM4riPqnXVj3L gKX1ru1LVX0VzwHuj744GdenR3HGyUsbFGL/ghFnR0lQGMrDso38HNX8bb03cFRD54PG 8hDUBY+GrcW7SZGunuBPqUGbraD6jmQUj4PTx1EVXu04izVyFb2JBmbnw5jVdMjpCNe4 RFrEmLToQpEbqK5GTbJpoIxo684K/aWoxlf1jrPPeZP1ZMTQYKMY7jwRm/ce6QQEtJd2 uhqw== X-Forwarded-Encrypted: i=1; AJvYcCW+rwitzN7QLlGs/Kuoesvo/R9RrK5VzPnbYir9P0Ca2Sppv1zhv8z654o1dLktxS3nE2qzFNQCPUJ+oxPNfxpB2+zGYL4NvOkpTBml X-Gm-Message-State: AOJu0YxKAsZVdrlBFbgzDJojpgBmFUVTFW9+1qigK7GFv3YNSDkOGWmz /cPq/Ge9tjjqROUIO8b1s1smO5Evm9/DBZ5gDEvEYSrrD4sWPsbvfyFNjtMBYHO1AXqwoAqSf2c nmNkAmNPHRTifdVoZZ1cKb2QGPzQdEwSSneSF+o9wD/VN+WI+DZSFBAU= X-Google-Smtp-Source: AGHT+IHJXTvNP3asABosrJ/H9yB0tmIoMQE0bdq+eQZGn9o0Lc9bqFKnQmev4bWFnLXPhmHG0ZB2Nm0Au8i9r7NTtN2zFcTdSQ+r Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6602:3f82:b0:803:85e8:c40a with SMTP id ca18e2360f4ac-81f960c86c1mr22385839f.3.1722267273745; Mon, 29 Jul 2024 08:34:33 -0700 (PDT) Date: Mon, 29 Jul 2024 08:34:33 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000000f67c9061e649949@google.com> Subject: [syzbot] [mm?] INFO: rcu detected stall in kcov_ioctl (2) From: syzbot To: akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 3a7e02c040b1 minmax: avoid overly complicated constant exp.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=132e32bd980000 kernel config: https://syzkaller.appspot.com/x/.config?x=381b8eb3d35e3ad9 dashboard link: https://syzkaller.appspot.com/bug?extid=ff2407cef5068e202465 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/198814da854c/disk-3a7e02c0.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/868e99275bc0/vmlinux-3a7e02c0.xz kernel image: https://storage.googleapis.com/syzbot-assets/ce63033f3708/bzImage-3a7e02c0.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ff2407cef5068e202465@syzkaller.appspotmail.com rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: rcu: Tasks blocked on level-0 rcu_node (CPUs 0-1): P9645/1:b..l P9626/1:b..l rcu: (detected by 0, t=10502 jiffies, g=53081, q=325 ncpus=2) task:syz-executor state:R running task stack:27168 pid:9626 tgid:9626 ppid:5216 flags:0x00004002 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0xe37/0x5490 kernel/sched/core.c:6529 preempt_schedule_irq+0x51/0x90 kernel/sched/core.c:6851 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:lock_acquire+0x1f2/0x560 kernel/locking/lockdep.c:5727 Code: c1 05 3a 13 9a 7e 83 f8 01 0f 85 ea 02 00 00 9c 58 f6 c4 02 0f 85 d5 02 00 00 48 85 ed 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24 RSP: 0018:ffffc90004647698 EFLAGS: 00000206 RAX: dffffc0000000000 RBX: 1ffff920008c8ed5 RCX: 0000000000000001 RDX: 0000000000000001 RSI: ffffffff8b4cc880 RDI: ffffffff8bb08c00 RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff28c4cd8 R10: ffffffff946266c7 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: ffffffff8ddb5220 R15: 0000000000000000 rcu_lock_acquire include/linux/rcupdate.h:326 [inline] rcu_read_lock include/linux/rcupdate.h:838 [inline] page_ext_get+0x3a/0x310 mm/page_ext.c:535 __set_page_owner+0x96/0x560 mm/page_owner.c:322 set_page_owner include/linux/page_owner.h:32 [inline] post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1493 prep_new_page mm/page_alloc.c:1501 [inline] get_page_from_freelist+0x1351/0x2e50 mm/page_alloc.c:3438 __alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4696 alloc_pages_mpol_noprof+0x275/0x610 mm/mempolicy.c:2263 vm_area_alloc_pages mm/vmalloc.c:3584 [inline] __vmalloc_area_node mm/vmalloc.c:3660 [inline] __vmalloc_node_range_noprof+0xa6a/0x1520 mm/vmalloc.c:3841 vmalloc_user_noprof+0x6b/0x90 mm/vmalloc.c:3995 kcov_ioctl+0x4f/0x730 kernel/kcov.c:706 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl fs/ioctl.c:893 [inline] __x64_sys_ioctl+0x193/0x220 fs/ioctl.c:893 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: 0033:0x7fa518d76e9b RSP: 002b:00007ffd114116d0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000100000 RCX: 00007fa518d76e9b RDX: 0000000000100000 RSI: ffffffff80086301 RDI: 00000000000000d7 RBP: 00007fa518f05f40 R08: 00000000000000da R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000009 task:syz-executor state:R running task stack:27088 pid:9645 tgid:9645 ppid:5216 flags:0x00000002 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0xe37/0x5490 kernel/sched/core.c:6529 preempt_schedule_common+0x44/0xc0 kernel/sched/core.c:6708 preempt_schedule_thunk+0x1a/0x30 arch/x86/entry/thunk.S:12 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_unlock+0x3e/0x50 kernel/locking/spinlock.c:186 spin_unlock include/linux/spinlock.h:391 [inline] insert_page mm/memory.c:2077 [inline] vm_insert_page+0x45d/0x6d0 mm/memory.c:2226 kcov_mmap+0xda/0x150 kernel/kcov.c:496 call_mmap include/linux/fs.h:2129 [inline] mmap_region+0x757/0x2760 mm/mmap.c:2957 do_mmap+0xbfb/0xfb0 mm/mmap.c:1468 vm_mmap_pgoff+0x1ba/0x360 mm/util.c:588 ksys_mmap_pgoff+0x332/0x5d0 mm/mmap.c:1514 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:86 [inline] __se_sys_mmap arch/x86/kernel/sys_x86_64.c:79 [inline] __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:79 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: 0033:0x7f7bf4f772d3 RSP: 002b:00007ffc20fff0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f7bf5106018 RCX: 00007f7bf4f772d3 RDX: 0000000000000003 RSI: 0000000000200000 RDI: 00007f7bf4601000 RBP: 00007f7bf4600000 R08: 00000000000000d8 R09: 0000000000000000 R10: 0000000000000011 R11: 0000000000000246 R12: 000000000000000c R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000009 rcu: rcu_preempt kthread starved for 10561 jiffies! g53081 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->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:R running task stack:27312 pid:17 tgid:17 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0xe37/0x5490 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6621 schedule_timeout+0x136/0x2a0 kernel/time/timer.c:2581 rcu_gp_fqs_loop+0x1eb/0xb00 kernel/rcu/tree.c:2034 rcu_gp_kthread+0x271/0x380 kernel/rcu/tree.c:2236 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: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.10.0-syzkaller-12710-g3a7e02c040b1 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline] RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:92 [inline] RIP: 0010:acpi_safe_halt+0x1a/0x20 drivers/acpi/processor_idle.c:112 Code: 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 65 48 8b 05 48 69 f2 74 48 8b 00 a8 08 75 0c 66 90 0f 00 2d b8 82 aa 00 fb f4 c3 cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffffff8da07d70 EFLAGS: 00000246 RAX: 0000000000004000 RBX: 0000000000000001 RCX: ffffffff8b115519 RDX: 0000000000000001 RSI: ffff88801a2cb800 RDI: ffff88801a2cb864 RBP: ffff88801a2cb864 R08: 0000000000000001 R09: ffffed1017246fe1 R10: ffff8880b9237f0b R11: 0000000000000000 R12: ffff88801c70a800 R13: ffffffff8e94eac0 R14: 0000000000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1eebebf378 CR3: 000000006bb72000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: acpi_idle_enter+0xc5/0x160 drivers/acpi/processor_idle.c:702 cpuidle_enter_state+0x85/0x500 drivers/cpuidle/cpuidle.c:267 cpuidle_enter+0x4e/0xa0 drivers/cpuidle/cpuidle.c:388 cpuidle_idle_call kernel/sched/idle.c:230 [inline] do_idle+0x313/0x3f0 kernel/sched/idle.c:326 cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:424 rest_init+0x16b/0x2b0 init/main.c:747 start_kernel+0x3df/0x4c0 init/main.c:1103 x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:507 x86_64_start_kernel+0xb2/0xc0 arch/x86/kernel/head64.c:488 common_startup_64+0x13e/0x148 --- This report is generated by a bot. 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