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=-2.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 D1E67C433F5 for ; Wed, 8 Sep 2021 06:36:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B0A2F61157 for ; Wed, 8 Sep 2021 06:36:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235956AbhIHGhj (ORCPT ); Wed, 8 Sep 2021 02:37:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35720 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229634AbhIHGhj (ORCPT ); Wed, 8 Sep 2021 02:37:39 -0400 Received: from mail-pf1-x42a.google.com (mail-pf1-x42a.google.com [IPv6:2607:f8b0:4864:20::42a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CF66AC061575; Tue, 7 Sep 2021 23:36:31 -0700 (PDT) Received: by mail-pf1-x42a.google.com with SMTP id f65so1169716pfb.10; Tue, 07 Sep 2021 23:36:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:from:date:message-id:subject:to; bh=REqAq0TQ03LuKhzd+LhB8acuVBtqXUemFDgaAKLAStQ=; b=EHrE7iF2/32yXZ6fEmgY8pXUvr4wGzbChcWKEDxwn8WzEmxUVhEfTdubKhXc4estOB OK1+dz1HiOW0BBIGClGmd8CGcgYMwZFRMy68c9TdYVcHuSnnqxlDqvgO/bTnhnJnuBCl 0ktXUrlZ0H39AAI9KErzdmLjGIq+LHq3q3+1oFmXcYdQq66kAAqjiEQBlHyQAXG/Hnx7 X8lc+Jnz+f/6v//lbnYuGJsQATIfkZZSjGn7HPTAA/ufFpCEkT4zX4H103OLmZF3VUDp njfbD8nu63Z5NOiYpmjNHkNLyensaUZexQy9YYm4iaIeCiH3tW7LOVGP0arl80SpZJvv vvQA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=REqAq0TQ03LuKhzd+LhB8acuVBtqXUemFDgaAKLAStQ=; b=odeK1715dedUiHswfSXsleDbG7E2SAUVv5LFsdnoJDYpnd5n1B4nGMnoQP+bIYBuEx tnqlcAFnvHw+HKJ5mpZZZtza0QWHQfD7kYX/cOfRlDudVkH9hFbNwn3TNonI8g8uy0a9 Dr7ikz1sJachyY+9y88pQcxCWekvWw76G2nVND+EMW8yq++535nHgUvfe/PYG2aA9CJ0 VjZQsbGd95IEuToKi5MPE7FcqOwHtqe6H+RxqmxJI53udQINTTD5EnzesdsJ8GzID8el jNESdw2Rd385CQFxrt5CxaqBp4bsxCmBkhbuCuB+Z1xP5k5kBMBXNjJYh+Wrxk/j5uMP eh6Q== X-Gm-Message-State: AOAM533K0OksQ/aDneLluTiyfr0omKupkDES0eFWhYR5wpW8dQ+/6ZSJ lUqsiTtO4jKSwHdxIYDtb76L8BXv2pPpkXxNlSY0lUVZqOSl X-Google-Smtp-Source: ABdhPJy92+P0vEVeFEzRE8q16XIFtjJfCqTWqdby5iVs60b6VV47lY2H6shmsIY9kaVqJS75c5xCbKEazNwOi4i2Hng= X-Received: by 2002:a63:e04a:: with SMTP id n10mr2149199pgj.381.1631082991145; Tue, 07 Sep 2021 23:36:31 -0700 (PDT) MIME-Version: 1.0 From: Hao Sun Date: Wed, 8 Sep 2021 14:36:20 +0800 Message-ID: Subject: INFO: task hung in io_wq_put_and_exit To: Jens Axboe , Pavel Begunkov , io-uring@vger.kernel.org, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Hello, When using Healer to fuzz the latest Linux kernel, the following crash was triggered. HEAD commit: 4b93c544e90e-thunderbolt: test: split up test cases git tree: upstream console output: https://drive.google.com/file/d/1fR5UsoLxFVUrCd1Q9Jri5gcL73FRwHZ6/view?usp=sharing kernel config: https://drive.google.com/file/d/1c0u2EeRDhRO-ZCxr9MP2VvAtJd6kfg-p/view?usp=sharing Sorry, I don't have a reproducer for this crash, hope the symbolized report can help. Again, I'll follow this crash closely and send a reproducer to you once Healer found it. If you fix this issue, please add the following tag to the commit: Reported-by: Hao Sun INFO: task syz-executor:15090 blocked for more than 143 seconds. Not tainted 5.14.0+ #1 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:28528 pid:15090 ppid: 14496 flags:0x00024004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0xcd9/0x2530 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 schedule_timeout+0x5e5/0x890 kernel/time/timer.c:1857 do_wait_for_common kernel/sched/completion.c:85 [inline] __wait_for_common kernel/sched/completion.c:106 [inline] wait_for_common kernel/sched/completion.c:117 [inline] wait_for_completion+0x17d/0x280 kernel/sched/completion.c:138 io_wq_exit_workers fs/io-wq.c:1162 [inline] io_wq_put_and_exit+0x39a/0xc10 fs/io-wq.c:1197 io_uring_clean_tctx fs/io_uring.c:9607 [inline] io_uring_cancel_generic+0x5fe/0x740 fs/io_uring.c:9687 io_uring_files_cancel include/linux/io_uring.h:16 [inline] do_exit+0x25c/0x2dd0 kernel/exit.c:780 do_group_exit+0x125/0x340 kernel/exit.c:922 get_signal+0x4d5/0x25a0 kernel/signal.c:2868 arch_do_signal_or_restart+0x2ed/0x1c40 arch/x86/kernel/signal.c:865 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+0x192/0x2a0 kernel/entry/common.c:209 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline] syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:302 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4739cb RSP: 002b:00007f284961dcd8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 00000000000000ca RBX: 000000000059c0a0 RCX: 00000000004739cd RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000059c0a8 RBP: 000000000059c0a8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000059c0ac R13: 00007ffc50a8281f R14: 00007ffc50a829c0 R15: 00007f284961ddc0 Showing all locks held in the system: 2 locks held by kworker/0:1/7: #0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline] #0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:634 [inline] #0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline] #0: ffff888010c66538 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x8c3/0x16d0 kernel/workqueue.c:2268 #1: ffffc900006a7dc8 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x8f7/0x16d0 kernel/workqueue.c:2272 1 lock held by khungtaskd/984: #0: ffffffff8b97dde0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by in:imklog/8209: #0: ffff88801a11d4f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990 2 locks held by kworker/u8:2/9035: #0: ffff888135c319d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x1e/0x30 kernel/sched/core.c:474 #1: ffff888135c1f9c8 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x3ab/0x490 kernel/sched/psi.c:880 5 locks held by kworker/u8:5/15070: #0: ffff8881000ad138 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: ffff8881000ad138 ((wq_completion)netns){+.+.}-{0:0}, at: arch_atomic_long_set include/linux/atomic/atomic-long.h:41 [inline] #0: ffff8881000ad138 ((wq_completion)netns){+.+.}-{0:0}, at: atomic_long_set include/linux/atomic/atomic-instrumented.h:1198 [inline] #0: ffff8881000ad138 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:634 [inline] #0: ffff8881000ad138 ((wq_completion)netns){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:661 [inline] #0: ffff8881000ad138 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x8c3/0x16d0 kernel/workqueue.c:2268 #1: ffffc9000773fdc8 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x8f7/0x16d0 kernel/workqueue.c:2272 #2: ffffffff8d0cc610 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x9b/0xa90 net/core/net_namespace.c:553 #3: ffffffff8d0e0228 (rtnl_mutex){+.+.}-{3:3}, at: ip_tunnel_delete_nets+0x8f/0x5e0 net/ipv4/ip_tunnel.c:1118 #4: ffffffff8b986f28 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline] #4: ffffffff8b986f28 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x519/0x650 kernel/rcu/tree_exp.h:837 3 locks held by syz-executor/20774: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 984 Comm: khungtaskd Not tainted 5.14.0+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x1e1/0x220 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+0xcc8/0x1010 kernel/hung_task.c:295 kthread+0x3e5/0x4d0 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 0 to CPUs 1-3: NMI backtrace for cpu 1 CPU: 1 PID: 20774 Comm: syz-executor Not tainted 5.14.0+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:hlock_id kernel/locking/lockdep.c:401 [inline] RIP: 0010:__lock_acquire+0xa64/0x57e0 kernel/locking/lockdep.c:5003 Code: 89 c1 89 44 24 58 01 d8 c1 c1 04 89 44 24 48 89 4c 24 50 48 b8 00 00 00 00 00 fc ff df 48 8b 54 24 30 48 c1 ea 03 0f b6 04 02 <84> c0 74 08 3c 03 0f 8e ed 3c 00 00 0f b7 45 20 66 25 ff 1f 66 89 RSP: 0018:ffffc900007e0550 EFLAGS: 00000016 RAX: 0000000000000000 RBX: f501fefe41178ce3 RCX: ffff8880139c09f8 RDX: 1ffff1100273814d RSI: 0000000000000008 RDI: ffff8880139c0a69 RBP: ffff8880139c0a48 R08: 0000000000000001 R09: fffffbfff1fa011e R10: ffffffff8fd008ef R11: fffffbfff1fa011d R12: 0000000000000040 R13: ffff8880139c0000 R14: 0000000000000002 R15: 0000000000000001 FS: 00007f496dccf700(0000) GS:ffff888135c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0079749710 CR3: 0000000017a50000 CR4: 0000000000350ee0 Call Trace: lock_acquire kernel/locking/lockdep.c:5625 [inline] lock_acquire+0x1ab/0x520 kernel/locking/lockdep.c:5590 seqcount_lockdep_reader_access include/linux/seqlock.h:103 [inline] timekeeping_get_delta kernel/time/timekeeping.c:252 [inline] timekeeping_get_ns kernel/time/timekeeping.c:386 [inline] ktime_get+0x147/0x470 kernel/time/timekeeping.c:829 clockevents_program_event+0x14a/0x370 kernel/time/clockevents.c:326 tick_program_event+0xb9/0x150 kernel/time/tick-oneshot.c:44 hrtimer_interrupt+0x36e/0x790 kernel/time/hrtimer.c:1824 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline] __sysvec_apic_timer_interrupt+0x146/0x540 arch/x86/kernel/apic/apic.c:1103 sysvec_apic_timer_interrupt+0x40/0xc0 arch/x86/kernel/apic/apic.c:1097 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638 RIP: 0010:check_kcov_mode+0x14/0x40 kernel/kcov.c:163 Code: 7f 47 00 e9 61 fd ff ff cc cc cc cc cc cc cc cc cc cc cc cc cc cc 65 8b 05 29 d0 8b 7e 89 c2 81 e2 00 01 00 00 a9 00 01 ff 00 <74> 10 31 c0 85 d2 74 15 8b 96 3c 15 00 00 85 d2 74 0b 8b 86 18 15 RSP: 0018:ffffc900007e09e8 EFLAGS: 00000206 RAX: 0000000080000301 RBX: 0000000000000000 RCX: ffffffff87bdf369 RDX: 0000000000000100 RSI: ffff8880139c0000 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000004 R11: ffffed1026b86531 R12: 0000000000000000 R13: ffff88801985b840 R14: ffff88801985b800 R15: dffffc0000000000 write_comp_data+0x1c/0x70 kernel/kcov.c:218 ip_packet_match net/ipv4/netfilter/ip_tables.c:54 [inline] ipt_do_table+0x5f9/0x1970 net/ipv4/netfilter/ip_tables.c:284 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline] nf_hook_slow+0xba/0x1e0 net/netfilter/core.c:589 nf_hook include/linux/netfilter.h:262 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] ip_rcv+0x204/0x3b0 net/ipv4/ip_input.c:540 __netif_receive_skb_one_core+0x114/0x180 net/core/dev.c:5436 __netif_receive_skb+0x24/0x1c0 net/core/dev.c:5550 process_backlog+0x223/0x770 net/core/dev.c:6427 __napi_poll+0xb3/0x630 net/core/dev.c:6982 napi_poll net/core/dev.c:7049 [inline] net_rx_action+0x823/0xbc0 net/core/dev.c:7136 __do_softirq+0x1d7/0x93b kernel/softirq.c:558 do_softirq kernel/softirq.c:459 [inline] do_softirq+0xb1/0xf0 kernel/softirq.c:446 __local_bh_enable_ip+0xf4/0x110 kernel/softirq.c:383 local_bh_enable include/linux/bottom_half.h:32 [inline] rcu_read_unlock_bh include/linux/rcupdate.h:757 [inline] ip_finish_output2+0x8c1/0x21e0 net/ipv4/ip_output.c:222 __ip_finish_output net/ipv4/ip_output.c:299 [inline] __ip_finish_output+0x856/0x1450 net/ipv4/ip_output.c:281 ip_finish_output+0x32/0x200 net/ipv4/ip_output.c:309 NF_HOOK_COND include/linux/netfilter.h:296 [inline] ip_mc_output+0x268/0xec0 net/ipv4/ip_output.c:408 dst_output include/net/dst.h:450 [inline] ip_local_out+0xaf/0x1a0 net/ipv4/ip_output.c:126 ip_send_skb+0x3e/0xe0 net/ipv4/ip_output.c:1555 udp_send_skb.isra.0+0x6d2/0x11c0 net/ipv4/udp.c:966 udp_sendmsg+0x1d86/0x2820 net/ipv4/udp.c:1253 inet_sendmsg+0x99/0xe0 net/ipv4/af_inet.c:821 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 ____sys_sendmsg+0x331/0x810 net/socket.c:2409 ___sys_sendmsg+0x100/0x170 net/socket.c:2463 __sys_sendmmsg+0x195/0x470 net/socket.c:2549 __do_sys_sendmmsg net/socket.c:2578 [inline] __se_sys_sendmmsg net/socket.c:2575 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2575 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4739cd Code: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f496dccec58 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 000000000059c0a0 RCX: 00000000004739cd RDX: 04000000000000a8 RSI: 0000000020000140 RDI: 0000000000000004 RBP: 00000000004ebd80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000059c0a0 R13: 00007ffc673401af R14: 00007ffc67340350 R15: 00007f496dccedc0 NMI backtrace for cpu 3 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] NMI backtrace for cpu 3 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] NMI backtrace for cpu 3 skipped: idling at default_idle+0xb/0x10 arch/x86/kernel/process.c:716 NMI backtrace for cpu 2 CPU: 2 PID: 4951 Comm: systemd-journal Not tainted 5.14.0+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:dput+0x1a9/0xbd0 fs/dcache.c:890 Code: 9d 02 00 00 e8 18 8a a6 ff e8 33 49 93 ff e8 0e 8a a6 ff 48 c7 c6 23 96 cf 81 48 c7 c7 e0 dd 97 8b e8 6b c9 8b ff 48 83 c4 20 <5b> 5d 41 5c 41 5d 41 5e 41 5f e9 e8 89 a6 ff e8 e3 89 a6 ff 4c 89 RSP: 0018:ffffc9000104fbb8 EFLAGS: 00000286 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffff888015f30000 RDX: 0000000000000000 RSI: ffff888015f30000 RDI: 0000000000000002 RBP: 0000000000000000 R08: ffffffff81cf94b6 R09: 0000000000000000 R10: 0000000000000005 R11: ffffed100c7e6531 R12: 0000000000000000 R13: ffffc9000104fce8 R14: 0000000000000007 R15: 0000000000000000 FS: 00007f456d6698c0(0000) GS:ffff888063f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f456ac62070 CR3: 000000001a2ce000 CR4: 0000000000350ee0 Call Trace: path_put fs/namei.c:557 [inline] terminate_walk+0x18f/0x5b0 fs/namei.c:672 path_lookupat.isra.0+0x21e/0x580 fs/namei.c:2466 __filename_lookup+0x1ca/0x410 fs/namei.c:2478 filename_lookup fs/namei.c:2494 [inline] user_path_at_empty+0x42/0x60 fs/namei.c:2801 user_path_at include/linux/namei.h:57 [inline] do_faccessat+0x127/0x850 fs/open.c:421 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f456c9259c7 Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007ffcc2832828 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00007ffcc2835740 RCX: 00007f456c9259c7 RDX: 00007f456d396a00 RSI: 0000000000000000 RDI: 00005569e73aa9a3 RBP: 00007ffcc2832860 R08: 000000000000d0c0 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007ffcc2835740 R15: 00007ffcc2832d50 ---------------- Code disassembly (best guess): 0: 89 c1 mov %eax,%ecx 2: 89 44 24 58 mov %eax,0x58(%rsp) 6: 01 d8 add %ebx,%eax 8: c1 c1 04 rol $0x4,%ecx b: 89 44 24 48 mov %eax,0x48(%rsp) f: 89 4c 24 50 mov %ecx,0x50(%rsp) 13: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 1a: fc ff df 1d: 48 8b 54 24 30 mov 0x30(%rsp),%rdx 22: 48 c1 ea 03 shr $0x3,%rdx 26: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax * 2a: 84 c0 test %al,%al <-- trapping instruction 2c: 74 08 je 0x36 2e: 3c 03 cmp $0x3,%al 30: 0f 8e ed 3c 00 00 jle 0x3d23 36: 0f b7 45 20 movzwl 0x20(%rbp),%eax 3a: 66 25 ff 1f and $0x1fff,%ax 3e: 66 data16 3f: 89 .byte 0x89%