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 2C8BDC6FA8E for ; Thu, 2 Mar 2023 18:11:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229943AbjCBSLu (ORCPT ); Thu, 2 Mar 2023 13:11:50 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40056 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229944AbjCBSLp (ORCPT ); Thu, 2 Mar 2023 13:11:45 -0500 Received: from mail-io1-f70.google.com (mail-io1-f70.google.com [209.85.166.70]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 526B03C7BE for ; Thu, 2 Mar 2023 10:11:41 -0800 (PST) Received: by mail-io1-f70.google.com with SMTP id d25-20020a0566022bf900b00745469852cfso10967965ioy.19 for ; Thu, 02 Mar 2023 10:11:41 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=UJ1HvKOCsyfFaw/s2rm+TqxkSv+zDGfPOVDPg1uHZws=; b=QMkAe7FmQOpvsm7PiSxd9pqegFrLGEWpUfpKBtbOE2+Pz0oT2sVtG7uSQpa4m3OoRo GbblQS+boyJh6fQmLMfF2EA2Rt8jDtZilT5cCXD/5adZQ+Y1pBjEZMBHU+P6QP/9CZ6u TkxQ49Q9OJWMDFl7Hj2mP+AVNSXY0pLVEZ7s+7hrr2wz3McEZT3Vk6rqWnumL2VUdS9X nVIsH5bP0j55HcTiyxxJAAadbT0I5G+NkgxpX2O6r+49BTCckWRGggt6Nc467RQRXShf GKymAnDavK3GuV4o0hXFjsSSKWnRq2NAn/kYnQI2hI9dImIR/4XPIrSPEG5RMETiAOXY 3X3g== X-Gm-Message-State: AO0yUKUjefhPnK3KqguYyZjSmo2YGn+EptJVTn81t8JZbhNdeYFoKwBV EvanYerEE+XqM0jtBJIJaS4PEcMf9pRwAl5boXTRx14t+Baj X-Google-Smtp-Source: AK7set+KKGVuJ/qHkjCEIZVP8I1hpvBrxLeVxW3px70/XuV+kO85nkNFalHuxoE2drSe/WWbPNXeRQBEONxZXEK4SdeXp4OhLw3J MIME-Version: 1.0 X-Received: by 2002:a6b:6a05:0:b0:745:6b06:6736 with SMTP id x5-20020a6b6a05000000b007456b066736mr4777731iog.1.1677780700662; Thu, 02 Mar 2023 10:11:40 -0800 (PST) Date: Thu, 02 Mar 2023 10:11:40 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000ac91f005f5eec2e5@google.com> Subject: [syzbot] [block?] INFO: task hung in blkdev_get_by_dev (5) From: syzbot To: axboe@kernel.dk, linux-block@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: linux-block@vger.kernel.org Hello, syzbot found the following issue on: HEAD commit: ee3f96b16468 Merge tag 'nfsd-6.3-1' of git://git.kernel.or.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14d4237f480000 kernel config: https://syzkaller.appspot.com/x/.config?x=cab35c936731a347 dashboard link: https://syzkaller.appspot.com/bug?extid=6229476844294775319e 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=143ecd60c80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=16bb7498c80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/cc502d28340b/disk-ee3f96b1.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/bbcfd7d6898c/vmlinux-ee3f96b1.xz kernel image: https://storage.googleapis.com/syzbot-assets/e9a1eddff73b/bzImage-ee3f96b1.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6229476844294775319e@syzkaller.appspotmail.com INFO: task syz-executor272:5173 blocked for more than 143 seconds. Not tainted 6.2.0-syzkaller-13115-gee3f96b16468 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor272 state:D stack:28152 pid:5173 ppid:5104 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5304 [inline] __schedule+0xcce/0x5b20 kernel/sched/core.c:6622 schedule+0xde/0x1a0 kernel/sched/core.c:6698 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6757 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0xa3b/0x1350 kernel/locking/mutex.c:747 blkdev_get_by_dev.part.0+0x9b/0xb80 block/bdev.c:735 blkdev_get_by_dev+0x6f/0x90 block/bdev.c:778 disk_scan_partitions+0x1dd/0x280 block/genhd.c:374 blkdev_common_ioctl+0x649/0x1ba0 block/ioctl.c:531 blkdev_ioctl+0x2c6/0x800 block/ioctl.c:610 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x197/0x210 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fc19fcb55a9 RSP: 002b:00007fc19fc62308 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fc19fd3a4c8 RCX: 00007fc19fcb55a9 RDX: 0000000000000000 RSI: 000000000000125f RDI: 0000000000000003 RBP: 00007fc19fd3a4c0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fc19fd3a4cc R13: 00007fc19fd071bc R14: 64626e2f7665642f R15: 0000000000022000 INFO: task syz-executor272:5174 blocked for more than 143 seconds. Not tainted 6.2.0-syzkaller-13115-gee3f96b16468 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor272 state:D stack:28632 pid:5174 ppid:5104 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5304 [inline] __schedule+0xcce/0x5b20 kernel/sched/core.c:6622 schedule+0xde/0x1a0 kernel/sched/core.c:6698 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6757 __mutex_lock_common kernel/locking/mutex.c:679 [inline] __mutex_lock+0xa3b/0x1350 kernel/locking/mutex.c:747 blkdev_put+0xc0/0x770 block/bdev.c:833 blkdev_close+0x68/0x80 block/fops.c:507 __fput+0x27c/0xa90 fs/file_table.c:321 task_work_run+0x16f/0x270 kernel/task_work.c:179 get_signal+0x1c7/0x25b0 kernel/signal.c:2635 arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203 __syscall_exit_to_user_mode_work kernel/entry/common.c:285 [inline] syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:296 do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7fc19fcb55a9 RSP: 002b:00007fc19fc41308 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: 0000000000000000 RBX: 00007fc19fd3a4d8 RCX: 00007fc19fcb55a9 RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000006 RBP: 00007fc19fd3a4d0 R08: 00007fc19fc41700 R09: 0000000000000000 R10: 00007fc19fc41700 R11: 0000000000000246 R12: 00007fc19fd3a4dc R13: 00007fc19fd071bc R14: 64626e2f7665642f R15: 0000000000022000 Showing all locks held in the system: 1 lock held by rcu_tasks_kthre/12: #0: ffffffff8c794e70 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:510 1 lock held by rcu_tasks_trace/13: #0: ffffffff8c794b70 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x31/0xd80 kernel/rcu/tasks.h:510 1 lock held by khungtaskd/28: #0: ffffffff8c7959c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x340 kernel/locking/lockdep.c:6495 2 locks held by getty/4757: #0: ffff88802792d098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x26/0x80 drivers/tty/tty_ldisc.c:244 #1: ffffc900015c02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xef4/0x13e0 drivers/tty/n_tty.c:2177 1 lock held by udevd/5109: #0: ffff88801e6c64c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x9b/0xb80 block/bdev.c:735 1 lock held by syz-executor272/5173: #0: ffff88801e6c64c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev.part.0+0x9b/0xb80 block/bdev.c:735 1 lock held by syz-executor272/5174: #0: ffff88801e6c64c8 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xc0/0x770 block/bdev.c:833 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.2.0-syzkaller-13115-gee3f96b16468 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 nmi_cpu_backtrace+0x316/0x3e0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x33f/0x460 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xe94/0x11e0 kernel/hung_task.c:379 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 9 Comm: kworker/u4:0 Not tainted 6.2.0-syzkaller-13115-gee3f96b16468 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x8/0x20 kernel/kcov.c:310 Code: 00 00 f3 0f 1e fa 48 8b 0c 24 89 f2 89 fe bf 05 00 00 00 e9 9a fe ff ff 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 48 8b 0c 24 <48> 89 f2 48 89 fe bf 07 00 00 00 e9 78 fe ff ff 0f 1f 84 00 00 00 RSP: 0018:ffffc900000e7998 EFLAGS: 00000202 RAX: dffffc0000000000 RBX: 0000000012467007 RCX: ffffffff81c2e957 RDX: 1ffff1100248cb55 RSI: 0000000012467007 RDI: 0000000000000000 RBP: 00002aaaaaaab000 R08: 0000000000000007 R09: 0000000000000080 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000012467067 R13: ffffc900000e7a40 R14: ffff888012465aa8 R15: ffff888012468000 FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055edea9b5c20 CR3: 000000000c571000 CR4: 0000000000350ee0 Call Trace: __get_locked_pte+0x67/0x270 mm/memory.c:1783 get_locked_pte include/linux/mm.h:2448 [inline] __text_poke+0x1b3/0x8e0 arch/x86/kernel/alternative.c:1584 text_poke arch/x86/kernel/alternative.c:1669 [inline] text_poke_bp_batch+0x3af/0x770 arch/x86/kernel/alternative.c:1992 text_poke_flush arch/x86/kernel/alternative.c:2161 [inline] text_poke_flush arch/x86/kernel/alternative.c:2158 [inline] text_poke_finish+0x1a/0x30 arch/x86/kernel/alternative.c:2168 arch_jump_label_transform_apply+0x17/0x30 arch/x86/kernel/jump_label.c:146 jump_label_update+0x32f/0x410 kernel/jump_label.c:829 static_key_disable_cpuslocked+0x156/0x1b0 kernel/jump_label.c:235 static_key_disable+0x1a/0x20 kernel/jump_label.c:243 toggle_allocation_gate mm/kfence/core.c:804 [inline] toggle_allocation_gate+0x143/0x230 mm/kfence/core.c:791 process_one_work+0x9bf/0x1820 kernel/workqueue.c:2390 worker_thread+0x669/0x1090 kernel/workqueue.c:2537 kthread+0x2e8/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:308 --- 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. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches