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=-0.9 required=3.0 tests=BAYES_00,FROM_LOCAL_HEX, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, UNWANTED_LANGUAGE_BODY,URIBL_BLOCKED autolearn=no 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 3A94BC433B4 for ; Mon, 17 May 2021 10:12:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0AEB3610C9 for ; Mon, 17 May 2021 10:12:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236224AbhEQKNo (ORCPT ); Mon, 17 May 2021 06:13:44 -0400 Received: from mail-il1-f200.google.com ([209.85.166.200]:48810 "EHLO mail-il1-f200.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229474AbhEQKNm (ORCPT ); Mon, 17 May 2021 06:13:42 -0400 Received: by mail-il1-f200.google.com with SMTP id h4-20020a926c040000b0290192f4fa4c3bso5893136ilc.15 for ; Mon, 17 May 2021 03:12:26 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:date:message-id:subject:from:to; bh=oALpm/cLFYAAjto4LlLeYC6dXbaWQKI/A/4g5+LlXzs=; b=Nr9JyvqK7RO5aBQWKMNeY5ysWjjzTIM9B6ngPviAEsElEJzbRDTpBcCfyuMm6b3tWU a1Z8PSMQd5gNjr7wA+tYFZC4V+JQEptgnR3Rs6hLi5ymc3MiWBKeRbDQoseDrJjQw/7/ HCM/KMfQhKbrmRP3X5oumR7etcKih0IUEyGlpH3OUy0hUot9BhS4bdBA8b5wjfwFVNs/ 1WuUdXgpfpMUpZNR2sjG+scVJEfOfKfNH5pJcR7qwsc9ObzVjeqF1IizOEGfsQo8pGWB 16Ld6l6Kd7bIWldEgYVj44tQNbmt/Wo+zV75INgB+WqlhWP9SEmkxhupJdc8d8tQGTOl EYGg== X-Gm-Message-State: AOAM533DvXCLJUC1pU+NTXTfJgGG2lF+Bv3HdBGLJDUERiJeWouuluKN fXe4rVsWv4YMJ8+S/1DYha7akMWB0lsvF9vVqiPgtj23quE4 X-Google-Smtp-Source: ABdhPJwXbtaOg3Lat7TRQJ3yDyNJl8iiDZ1TO/5wkhkmDjstbK6o2fVm9b6GKRE9Fyjs8xLdAdQnoOb1V8I59cxATf4pBV0Y0UB4 MIME-Version: 1.0 X-Received: by 2002:a02:3406:: with SMTP id x6mr54775748jae.137.1621246345937; Mon, 17 May 2021 03:12:25 -0700 (PDT) Date: Mon, 17 May 2021 03:12:25 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000008b0af105c283d4d8@google.com> Subject: [syzbot] INFO: rcu detected stall in sys_open (3) From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: e99d8a84 Add linux-next specific files for 20210409 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=1777a745d00000 kernel config: https://syzkaller.appspot.com/x/.config?x=7cd69574979bfeb7 dashboard link: https://syzkaller.appspot.com/bug?extid=722e26bca192a00fe8ee syz repro: https://syzkaller.appspot.com/x/repro.syz?x=179ad736d00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15984e9ad00000 Bisection is inconclusive: the issue happens on the oldest tested release. bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=110bad36d00000 final oops: https://syzkaller.appspot.com/x/report.txt?x=130bad36d00000 console output: https://syzkaller.appspot.com/x/log.txt?x=150bad36d00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+722e26bca192a00fe8ee@syzkaller.appspotmail.com rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-...!: (1 GPs behind) idle=826/1/0x4000000000000000 softirq=9816/9822 fqs=0 (t=10500 jiffies g=10153 q=86) rcu: rcu_preempt kthread starved for 10500 jiffies! g10153 f0x0 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:29008 pid: 14 ppid: 2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:4329 [inline] __schedule+0x917/0x2170 kernel/sched/core.c:5079 schedule+0xcf/0x270 kernel/sched/core.c:5158 schedule_timeout+0x14a/0x250 kernel/time/timer.c:1878 rcu_gp_fqs_loop kernel/rcu/tree.c:1983 [inline] rcu_gp_kthread+0xd33/0x2300 kernel/rcu/tree.c:2156 kthread+0x3b1/0x4a0 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 rcu: Stack dump where RCU GP kthread last ran: Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 8440 Comm: syz-executor021 Not tainted 5.12.0-rc6-next-20210409-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__raw_callee_save___pv_queued_spin_unlock+0xc/0x12 Code: 56 57 41 50 41 51 41 52 41 53 e8 af 15 00 00 41 5b 41 5a 41 59 41 58 5f 5e 5a 59 c3 66 90 52 b8 01 00 00 00 31 d2 f0 0f b0 17 <3c> 01 75 02 5a c3 56 0f b6 f0 e8 c5 ff ff ff 5e 5a c3 66 90 48 b8 RSP: 0018:ffffc90000dc0de8 EFLAGS: 00000046 RAX: 0000000000000001 RBX: 0000000000000046 RCX: ffffffff815a4640 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880b9d26380 RBP: ffff8880b9d26380 R08: 0000000000000000 R09: ffff8880b9d26383 R10: ffffed10173a4c70 R11: 0000000000000000 R12: ffff8880b9d26388 R13: ffff8880b9d26390 R14: ffff8880b9d26380 R15: ffffffff819153e0 FS: 000000000093c3c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffc81d37000 CR3: 0000000014041000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: pv_queued_spin_unlock arch/x86/include/asm/paravirt.h:590 [inline] queued_spin_unlock arch/x86/include/asm/qspinlock.h:56 [inline] do_raw_spin_unlock+0x171/0x230 kernel/locking/spinlock_debug.c:139 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:159 [inline] _raw_spin_unlock_irqrestore+0x1e/0x70 kernel/locking/spinlock.c:191 __run_hrtimer kernel/time/hrtimer.c:1533 [inline] __hrtimer_run_queues+0x51a/0xe50 kernel/time/hrtimer.c:1601 hrtimer_interrupt+0x330/0xa00 kernel/time/hrtimer.c:1663 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1106 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632 RIP: 0010:check_kcov_mode+0x7/0x40 kernel/kcov.c:163 Code: fe ff ff 48 89 df e8 58 d3 44 00 e9 a1 fe ff ff 48 8b 3c 24 e8 4a d3 44 00 e9 18 fe ff ff cc cc cc cc cc 65 8b 05 c9 c7 8d 7e <89> c2 81 e2 00 01 00 00 a9 00 01 ff 00 74 10 31 c0 85 d2 74 15 8b RSP: 0018:ffffc9000167ea08 EFLAGS: 00000246 RAX: 0000000080000000 RBX: 0000000000000001 RCX: ffff88802149d580 RDX: fffff94000212ef9 RSI: ffff88802149d580 RDI: 0000000000000003 RBP: ffffea00010977c0 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffff81d3faaa R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: fffff94000212ef8 R15: 0000000000000000 write_comp_data kernel/kcov.c:218 [inline] __sanitizer_cov_trace_const_cmp1+0x22/0x80 kernel/kcov.c:270 compound_nr include/linux/mm.h:981 [inline] zero_user_segments+0x37a/0x4c0 include/linux/highmem.h:231 zero_user include/linux/highmem.h:245 [inline] block_read_full_page+0x96f/0xe40 fs/buffer.c:2351 read_pages+0x5c5/0x8d0 mm/readahead.c:145 page_cache_ra_unbounded+0x5fe/0x920 mm/readahead.c:238 do_page_cache_ra mm/readahead.c:267 [inline] ondemand_readahead+0x61e/0x11a0 mm/readahead.c:550 page_cache_async_ra mm/readahead.c:607 [inline] page_cache_async_ra+0x2e1/0x3f0 mm/readahead.c:582 page_cache_async_readahead include/linux/pagemap.h:901 [inline] filemap_readahead mm/filemap.c:2434 [inline] filemap_get_pages+0x60a/0x1920 mm/filemap.c:2475 filemap_read+0x2ca/0xe40 mm/filemap.c:2542 generic_file_read_iter+0x397/0x4f0 mm/filemap.c:2693 __kernel_read+0x58d/0xa90 fs/read_write.c:454 integrity_kernel_read+0x7b/0xb0 security/integrity/iint.c:199 ima_calc_file_hash_tfm+0x2aa/0x3b0 security/integrity/ima/ima_crypto.c:484 ima_calc_file_shash security/integrity/ima/ima_crypto.c:515 [inline] ima_calc_file_hash+0x19d/0x4b0 security/integrity/ima/ima_crypto.c:572 ima_collect_measurement+0x4ca/0x570 security/integrity/ima/ima_api.c:252 process_measurement+0xd1c/0x17e0 security/integrity/ima/ima_main.c:330 ima_file_check+0xb1/0x100 security/integrity/ima/ima_main.c:499 do_open fs/namei.c:3363 [inline] path_openat+0x15b0/0x27d0 fs/namei.c:3494 do_filp_open+0x190/0x3d0 fs/namei.c:3521 do_sys_openat2+0x16d/0x420 fs/open.c:1187 do_sys_open fs/open.c:1203 [inline] __do_sys_open fs/open.c:1211 [inline] __se_sys_open fs/open.c:1207 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1207 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x445d39 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 c4 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc81d36578 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ffc81d365b0 RCX: 0000000000445d39 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200000c0 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000f4240 R13: 0000000000000000 R14: 00007ffc81d3659c R15: 00007ffc81d365a0 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.861 msecs NMI backtrace for cpu 0 CPU: 0 PID: 8434 Comm: syz-executor021 Not tainted 5.12.0-rc6-next-20210409-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x141/0x1d7 lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x44/0xd7 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline] rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:341 print_cpu_stall kernel/rcu/tree_stall.h:624 [inline] check_cpu_stall kernel/rcu/tree_stall.h:699 [inline] rcu_pending kernel/rcu/tree.c:3889 [inline] rcu_sched_clock_irq.cold+0x3f1/0x74b kernel/rcu/tree.c:2628 update_process_times+0x16d/0x200 kernel/time/timer.c:1782 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1373 __run_hrtimer kernel/time/hrtimer.c:1537 [inline] __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1601 hrtimer_interrupt+0x330/0xa00 kernel/time/hrtimer.c:1663 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1089 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1106 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1100 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:632 RIP: 0010:preempt_count_add+0x26/0x140 kernel/sched/core.c:4729 Code: 0f 1f 40 00 48 c7 c0 20 97 e8 8f 55 48 ba 00 00 00 00 00 fc ff df 48 89 c1 53 83 e0 07 89 fb 48 c1 e9 03 83 c0 03 0f b6 14 11 <38> d0 7c 08 84 d2 0f 85 e1 00 00 00 8b 15 88 36 9a 0e 65 01 1d 21 RSP: 0018:ffffc900017464e0 EFLAGS: 00000206 RAX: 0000000000000003 RBX: 0000000000000001 RCX: 1ffffffff1fd12e4 RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000001 RBP: 0000000000000001 R08: ffffffff8e4bf296 R09: 0000000000000001 R10: fffff520002e8cc5 R11: 0000000000084087 R12: ffffc90001746618 R13: 0000000000000000 R14: ffffc900017465d0 R15: 0000000000408d40 unwind_next_frame+0x120/0x1ce0 arch/x86/kernel/unwind_orc.c:428 arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:121 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38 kasan_set_track mm/kasan/common.c:46 [inline] set_alloc_info mm/kasan/common.c:428 [inline] __kasan_slab_alloc+0x84/0xa0 mm/kasan/common.c:461 kasan_slab_alloc include/linux/kasan.h:236 [inline] slab_post_alloc_hook mm/slab.h:527 [inline] slab_alloc_node mm/slub.c:2924 [inline] slab_alloc mm/slub.c:2932 [inline] kmem_cache_alloc+0x153/0x390 mm/slub.c:2937 kmem_cache_zalloc include/linux/slab.h:678 [inline] alloc_buffer_head+0x20/0x140 fs/buffer.c:3409 alloc_page_buffers+0x280/0x750 fs/buffer.c:857 create_empty_buffers+0x2c/0x820 fs/buffer.c:1618 create_page_buffers+0x2ac/0x3c0 fs/buffer.c:1735 block_read_full_page+0xc9/0xe40 fs/buffer.c:2326 read_pages+0x5c5/0x8d0 mm/readahead.c:145 page_cache_ra_unbounded+0x5fe/0x920 mm/readahead.c:238 do_page_cache_ra mm/readahead.c:267 [inline] ondemand_readahead+0x61e/0x11a0 mm/readahead.c:550 page_cache_async_ra mm/readahead.c:607 [inline] page_cache_async_ra+0x2e1/0x3f0 mm/readahead.c:582 page_cache_async_readahead include/linux/pagemap.h:901 [inline] filemap_readahead mm/filemap.c:2434 [inline] filemap_get_pages+0x60a/0x1920 mm/filemap.c:2475 filemap_read+0x2ca/0xe40 mm/filemap.c:2542 generic_file_read_iter+0x397/0x4f0 mm/filemap.c:2693 __kernel_read+0x58d/0xa90 fs/read_write.c:454 integrity_kernel_read+0x7b/0xb0 security/integrity/iint.c:199 ima_calc_file_hash_tfm+0x2aa/0x3b0 security/integrity/ima/ima_crypto.c:484 ima_calc_file_shash security/integrity/ima/ima_crypto.c:515 [inline] ima_calc_file_hash+0x19d/0x4b0 security/integrity/ima/ima_crypto.c:572 ima_collect_measurement+0x4ca/0x570 security/integrity/ima/ima_api.c:252 process_measurement+0xd1c/0x17e0 security/integrity/ima/ima_main.c:330 ima_file_check+0xb1/0x100 security/integrity/ima/ima_main.c:499 do_open fs/namei.c:3363 [inline] path_openat+0x15b0/0x27d0 fs/namei.c:3494 do_filp_open+0x190/0x3d0 fs/namei.c:3521 do_sys_openat2+0x16d/0x420 fs/open.c:1187 do_sys_open fs/open.c:1203 [inline] __do_sys_open fs/open.c:1211 [inline] __se_sys_open fs/open.c:1207 [inline] __x64_sys_open+0x119/0x1c0 fs/open.c:1207 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x445d39 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 c4 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffc81d36578 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ffc81d365b0 RCX: 0000000000445d39 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200000c0 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000f4240 R13: 0000000000000000 R14: 00007ffc81d3659c R15: 00007ffc81d365a0 sched: RT throttling activated --- 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. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches