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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 632F1C433EF for ; Wed, 8 Dec 2021 00:04:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242692AbhLHAIK (ORCPT ); Tue, 7 Dec 2021 19:08:10 -0500 Received: from mail-io1-f70.google.com ([209.85.166.70]:42757 "EHLO mail-io1-f70.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242662AbhLHAIJ (ORCPT ); Tue, 7 Dec 2021 19:08:09 -0500 Received: by mail-io1-f70.google.com with SMTP id k125-20020a6bba83000000b005e7a312f86dso1123572iof.9 for ; Tue, 07 Dec 2021 16:04:38 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:date:in-reply-to:message-id:subject :from:to; bh=LLxo9yR1C18zIZFvHekT6AM9u91kgXbh230N0pjOmj0=; b=qSAlETV8bUIkW5b7FuEmckZLnr9GNAgy4sCYNrQMzD/hHNQTKcI01fAv/Nz2iJ/LlZ xf7XfRlnXgieTzDWZzP2coFFLBPuKiyeXBZ0m2GtxIanxR0J1OhwWMW3+r6KgIlJClpg pgPTYSW2rdz7yY5m9yheWSdcgyh1mdoEWTfHRkjx27RqWkNYZyYKss1b87C0IBzRC/jp 3dWPhcc99bFnbncORV7vyayTsgm3UDqHd7q6YaOLBpHlFa0SSDvgQxdJyTysy0v8i8PI nh8m1+aEG6HaCaPsIrtSe8ZbQHQJbktEGNLwqD9J5b4YgCQFqOpbtEHKrGCrbkxCLAmB zeJg== X-Gm-Message-State: AOAM5318XYtii1mZsGQNyfUntslVfgcX6ZUdGdfFuwwokeBU01f7sZj/ sMfzWp6RbgYqNaQ4rwbhHkHxzdxXY98i7hLtPAipiYKMYSjK X-Google-Smtp-Source: ABdhPJzwtIGXpwhfc9nPR0X8NX8x3rvEQSVjP9FRj6evJC/xYLpptRmTscIkhvqr+WbnevHpJ6HZ1lUDP0k8Su+rE4LfgJPNanqJ MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1d1e:: with SMTP id i30mr2058617ila.182.1638921878414; Tue, 07 Dec 2021 16:04:38 -0800 (PST) Date: Tue, 07 Dec 2021 16:04:38 -0800 In-Reply-To: <000000000000e016c205d1025f4c@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <00000000000060ab3b05d2973c1a@google.com> Subject: Re: [syzbot] INFO: task hung in io_uring_cancel_generic (2) From: syzbot To: asml.silence@gmail.com, axboe@kernel.dk, io-uring@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org syzbot has found a reproducer for the following issue on: HEAD commit: cd8c917a56f2 Makefile: Do not quote value for CONFIG_CC_IM.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=153be575b00000 kernel config: https://syzkaller.appspot.com/x/.config?x=5247c9e141823545 dashboard link: https://syzkaller.appspot.com/bug?extid=21e6887c0be14181206d compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1218dce1b00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16f91d89b00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+21e6887c0be14181206d@syzkaller.appspotmail.com INFO: task syz-executor255:7795 blocked for more than 143 seconds. Not tainted 5.16.0-rc4-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor255 state:D stack:28448 pid: 7795 ppid: 6531 flags:0x00024004 Call Trace: context_switch kernel/sched/core.c:4972 [inline] __schedule+0xa9a/0x4940 kernel/sched/core.c:6253 schedule+0xd2/0x260 kernel/sched/core.c:6326 io_uring_cancel_generic+0x53d/0x690 fs/io_uring.c:9877 io_uring_files_cancel include/linux/io_uring.h:16 [inline] do_exit+0x60c/0x2b40 kernel/exit.c:787 do_group_exit+0x125/0x310 kernel/exit.c:929 get_signal+0x47d/0x2220 kernel/signal.c:2852 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868 handle_signal_work kernel/entry/common.c:148 [inline] exit_to_user_mode_loop kernel/entry/common.c:172 [inline] exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f413d0aaa59 RSP: 002b:00007f413d05c308 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: fffffffffffffe00 RBX: 00007f413d132408 RCX: 00007f413d0aaa59 RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f413d132408 RBP: 00007f413d132400 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f413d13240c R13: 0000000000000003 R14: 00007f413d05c400 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8bb811a0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6458 1 lock held by in:imklog/6223: #0: ffff88801d98d670 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:994 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.16.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x1b3/0x230 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0xc1d/0xf50 kernel/hung_task.c:295 kthread+0x405/0x4f0 kernel/kthread.c:327 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 2964 Comm: systemd-journal Not tainted 5.16.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:58 [inline] RIP: 0010:stack_access_ok arch/x86/kernel/unwind_orc.c:342 [inline] RIP: 0010:deref_stack_reg+0x0/0x150 arch/x86/kernel/unwind_orc.c:352 Code: 14 24 e9 7b ff ff ff 48 89 14 24 e8 da 25 89 00 48 8b 14 24 e9 48 ff ff ff 48 89 0c 24 e8 c8 25 89 00 48 8b 0c 24 eb 9d 66 90 <48> b8 00 00 00 00 00 fc ff df 41 55 41 54 49 89 fc 55 48 89 f5 53 RSP: 0018:ffffc90001ad79b0 EFLAGS: 00000046 RAX: ffffc90001ad7bb8 RBX: 1ffff9200035af3f RCX: ffffffff8e10151b RDX: ffffc90001ad7ad8 RSI: ffffc90001ad7bb0 RDI: ffffc90001ad7a90 RBP: 0000000000000001 R08: ffffffff8e101516 R09: 0000000000000001 R10: fffff5200035af5d R11: 000000000008808a R12: ffffc90001ad7ad8 R13: ffffc90001ad7ac5 R14: ffffc90001ad7a90 R15: ffffffff8e10151a FS: 00007f48af6af8c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f48aca93018 CR3: 000000007738a000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: unwind_next_frame+0xcdc/0x1ce0 arch/x86/kernel/unwind_orc.c:534 arch_stack_walk+0x7d/0xe0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x8c/0xc0 kernel/stacktrace.c:122 kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38 kasan_set_track+0x21/0x30 mm/kasan/common.c:46 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370 ____kasan_slab_free mm/kasan/common.c:366 [inline] ____kasan_slab_free mm/kasan/common.c:328 [inline] __kasan_slab_free+0xd1/0x110 mm/kasan/common.c:374 kasan_slab_free include/linux/kasan.h:235 [inline] __cache_free mm/slab.c:3445 [inline] kmem_cache_free.part.0+0x91/0x200 mm/slab.c:3741 security_file_free+0xa4/0xd0 security/security.c:1535 file_free fs/file_table.c:55 [inline] __fput+0x3d6/0x9f0 fs/file_table.c:298 task_work_run+0xdd/0x1a0 kernel/task_work.c:164 tracehook_notify_resume include/linux/tracehook.h:189 [inline] exit_to_user_mode_loop kernel/entry/common.c:175 [inline] exit_to_user_mode_prepare+0x27e/0x290 kernel/entry/common.c:207 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f48aec3e840 Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 RSP: 002b:00007ffd32e9b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: fffffffffffffffe RBX: 00007ffd32e9b490 RCX: 00007f48aec3e840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 000055dc34efa230 RBP: 000000000000000d R08: 00000000000001e0 R09: 00000000ffffffff R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff R13: 000055dc34eef060 R14: 00007ffd32e9b450 R15: 000055dc34efa320 INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.354 msecs ---------------- Code disassembly (best guess): 0: 14 24 adc $0x24,%al 2: e9 7b ff ff ff jmpq 0xffffff82 7: 48 89 14 24 mov %rdx,(%rsp) b: e8 da 25 89 00 callq 0x8925ea 10: 48 8b 14 24 mov (%rsp),%rdx 14: e9 48 ff ff ff jmpq 0xffffff61 19: 48 89 0c 24 mov %rcx,(%rsp) 1d: e8 c8 25 89 00 callq 0x8925ea 22: 48 8b 0c 24 mov (%rsp),%rcx 26: eb 9d jmp 0xffffffc5 28: 66 90 xchg %ax,%ax * 2a: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax <-- trapping instruction 31: fc ff df 34: 41 55 push %r13 36: 41 54 push %r12 38: 49 89 fc mov %rdi,%r12 3b: 55 push %rbp 3c: 48 89 f5 mov %rsi,%rbp 3f: 53 push %rbx