From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oo1-f77.google.com (mail-oo1-f77.google.com [209.85.161.77]) (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 79BCF1D61A3 for ; Tue, 9 Dec 2025 23:04:18 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.161.77 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765321460; cv=none; b=px+HJ5429cF0Ox8Pz+s5OhGAok5nP720QJ/eqf3RCCXzoYJDvKq/KPDtDC7GdlGwV960EJm1H/NmiATexnnrNIup0T24dWVlyM7X7hr6JjuzWLR557uaZQ49+cwFzFvZPiwu3YyBt1rwsJQ3IsvDUI8wXx4LOa74EWphn413hDs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765321460; c=relaxed/simple; bh=NIVro1SOQdLPBOyeKJj/zTfkwKR6IFDoV2cm2TcN7iI=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=ZzTQFBuUPGisJiiJ4P+86cvhhKq5HXHnZlfFDdCaIBPZNHz33pCo7r9rZ4ZTbiGX3eEOwRYdmn7wln+ZmYm8nEvESHbayFv+lKUY96g7tIbSM8f3Jz7CgxHR9lGJs9/0ugX+mADE4HdbYVg3CsTDGENoIj08RXPGDZOdvFgZAQw= 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=209.85.161.77 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-oo1-f77.google.com with SMTP id 006d021491bc7-65742f8c565so9662410eaf.1 for ; Tue, 09 Dec 2025 15:04:18 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1765321457; x=1765926257; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=tCz8Pzju1wHYNulx//WuZW8IfSTFFeX5t6v95K7DqYU=; b=G3dPCnd49rSn+CeCNInVqnnbB+X3/DrUrcdOAU7kHSGAZALYlnBYLQmzQFxqqfpnKX mSshHqvJt5+9vaGy6KILD1qf0mM8QzBmf0+WsyPqZl9adDi6X3aASJldshlC+IQD+Gzt 2VjVAbNAo5hEEt6lcd/2vqfIGVFcpBrWYACT1iy4snkhO9SWX7JCs9eyOkGIRPCRTVDH dECY6kDee0PUvDaxHkIwStv+z13GH48+UhgHeyi1kjDPGziJgoyPq6RB7aH64GH4s/yp yh8lt2tC92kHHdxioaUcBb4NyoQIUXAGLd45rF3rRGlMhOyNQ7tKbKxyKFZN2EwueLb1 YEtA== X-Forwarded-Encrypted: i=1; AJvYcCVf1mjf6FbmZruOMdD8oZp2DUOu/iCQ5rIOwljAhp5euyzFnkLhtlFxDUfuuW60RcM6noLR7K8w78OQR7U=@vger.kernel.org X-Gm-Message-State: AOJu0YzNk3e9hcgCSlZVKEe+UwjM6BPhI2jpauJJxt9bWfeDthHYdnRx w0iEPtBuXV3HsfKVn2TnDcZtDTc2Z6T3fmI674/wbwOwroACJMio8bKj/oRcEYB8QNZOaai8Oh3 hrSYdQeczmfDhCK1LvC8j15zPh+VzD5LuQ5lw8ElJZfPtMffjS59mDC9M8NM= X-Google-Smtp-Source: AGHT+IFoFj6ZgxiVHTn9gFK42Fs7KhnTjjPx7upH6Ts29YjeUH5YRmXunujf/Vsa1vCbALJCU+T/rcFimDL9YZ02ASflUQkyIwUI Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:160d:b0:659:9a49:8fdb with SMTP id 006d021491bc7-65b2ad3a2c9mr258625eaf.84.1765321457629; Tue, 09 Dec 2025 15:04:17 -0800 (PST) Date: Tue, 09 Dec 2025 15:04:17 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6938aaf1.050a0220.1ff09b.000c.GAE@google.com> Subject: [syzbot] [block?] [trace?] INFO: task hung in relay_open (2) From: syzbot To: axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, mathieu.desnoyers@efficios.com, mhiramat@kernel.org, rostedt@goodmis.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 6987d58a9cbc Add linux-next specific files for 20251205 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=10bf76b4580000 kernel config: https://syzkaller.appspot.com/x/.config?x=a94030c847137a18 dashboard link: https://syzkaller.appspot.com/bug?extid=16ea22f26882d7e46f35 compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13c88992580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/59159f6ab772/disk-6987d58a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/f1f1b2a92c01/vmlinux-6987d58a.xz kernel image: https://storage.googleapis.com/syzbot-assets/ff8485477cfd/bzImage-6987d58a.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+16ea22f26882d7e46f35@syzkaller.appspotmail.com INFO: task syz.2.19:6056 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.2.19 state:D stack:25248 pid:6056 tgid:6055 ppid:5947 task_flags:0x400140 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5256 [inline] __schedule+0x14bc/0x5000 kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0x165/0x360 kernel/sched/core.c:6960 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7017 __mutex_lock_common kernel/locking/mutex.c:692 [inline] __mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:776 relay_open+0x3b8/0x920 kernel/relay.c:517 blk_trace_setup_prepare+0x425/0x5a0 kernel/trace/blktrace.c:716 blk_trace_setup+0x244/0x3d0 kernel/trace/blktrace.c:789 blk_trace_ioctl+0x2f9/0x6e0 kernel/trace/blktrace.c:935 blkdev_ioctl+0x4a2/0x710 block/ioctl.c:780 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fea2af8f749 RSP: 002b:00007fea2bf0d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fea2b1e5fa0 RCX: 00007fea2af8f749 RDX: 0000200000000240 RSI: 00000000c0481273 RDI: 0000000000000003 RBP: 00007fea2b013f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fea2b1e6038 R14: 00007fea2b1e5fa0 R15: 00007ffde1a3bc48 INFO: task syz.4.21:6058 blocked for more than 145 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.21 state:D stack:26184 pid:6058 tgid:6057 ppid:5957 task_flags:0x400140 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5256 [inline] __schedule+0x14bc/0x5000 kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0x165/0x360 kernel/sched/core.c:6960 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7017 __mutex_lock_common kernel/locking/mutex.c:692 [inline] __mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:776 relay_open+0x3b8/0x920 kernel/relay.c:517 blk_trace_setup_prepare+0x425/0x5a0 kernel/trace/blktrace.c:716 blk_trace_setup+0x244/0x3d0 kernel/trace/blktrace.c:789 blk_trace_ioctl+0x2f9/0x6e0 kernel/trace/blktrace.c:935 blkdev_ioctl+0x4a2/0x710 block/ioctl.c:780 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f046d78f749 RSP: 002b:00007f046e673038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f046d9e5fa0 RCX: 00007f046d78f749 RDX: 0000200000000240 RSI: 00000000c0481273 RDI: 0000000000000003 RBP: 00007f046d813f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f046d9e6038 R14: 00007f046d9e5fa0 R15: 00007fffac8419a8 INFO: task syz.3.20:6060 blocked for more than 146 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.3.20 state:D stack:26776 pid:6060 tgid:6059 ppid:5954 task_flags:0x400140 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5256 [inline] __schedule+0x14bc/0x5000 kernel/sched/core.c:6863 __schedule_loop kernel/sched/core.c:6945 [inline] schedule+0x165/0x360 kernel/sched/core.c:6960 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7017 __mutex_lock_common kernel/locking/mutex.c:692 [inline] __mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:776 relay_open+0x3b8/0x920 kernel/relay.c:517 blk_trace_setup_prepare+0x425/0x5a0 kernel/trace/blktrace.c:716 blk_trace_setup+0x244/0x3d0 kernel/trace/blktrace.c:789 blk_trace_ioctl+0x2f9/0x6e0 kernel/trace/blktrace.c:935 blkdev_ioctl+0x4a2/0x710 block/ioctl.c:780 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f92ec78f749 RSP: 002b:00007f92ed544038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f92ec9e5fa0 RCX: 00007f92ec78f749 RDX: 0000200000000240 RSI: 00000000c0481273 RDI: 0000000000000003 RBP: 00007f92ec813f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f92ec9e6038 R14: 00007f92ec9e5fa0 R15: 00007fffaeee7358 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffffffff8df419e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8df419e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline] #0: ffffffff8df419e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775 3 locks held by kworker/u8:7/1150: #0: ffff88814c8c7948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x841/0x15a0 kernel/workqueue.c:3236 #1: ffffc90003ddfb80 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x868/0x15a0 kernel/workqueue.c:3237 #2: ffffffff8f310348 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #2: ffffffff8f310348 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x112/0x14b0 net/ipv6/addrconf.c:4194 2 locks held by klogd/5190: 3 locks held by udevd/5201: 2 locks held by dhcpcd/5495: 2 locks held by getty/5585: #0: ffff88814c2ba0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000332b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x449/0x1460 drivers/tty/n_tty.c:2211 3 locks held by syz-execprog/5825: #0: ffff88807d8b9bc0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_trylock include/linux/mmap_lock.h:410 [inline] ffff88807d8b9bc0 (&mm->mmap_lock){++++}-{4:4}, at: get_mmap_lock_carefully mm/mmap_lock.c:390 [inline] ffff88807d8b9bc0 (&mm->mmap_lock){++++}-{4:4}, at: lock_mm_and_find_vma+0x32/0x300 mm/mmap_lock.c:450 #1: ffff88807ec85280 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline] #1: ffff88807ec85280 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_fault+0x8ff/0x1290 mm/filemap.c:3556 #2: ffffffff8e04f820 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4374 [inline] #2: ffffffff8e04f820 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xb8/0x300 mm/page_alloc.c:4399 6 locks held by syz-execprog/5826: 1 lock held by syz-execprog/5827: #0: ffff88807ec85280 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:1092 [inline] #0: ffff88807ec85280 (mapping.invalidate_lock#2){++++}-{4:4}, at: filemap_fault+0x8ff/0x1290 mm/filemap.c:3556 2 locks held by syz-executor/5834: 3 locks held by syz.1.18/6054: 2 locks held by syz.2.19/6056: #0: ffff88814173d520 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0x21c/0x3d0 kernel/trace/blktrace.c:788 #1: ffffffff8df98a48 (relay_channels_mutex){+.+.}-{4:4}, at: relay_open+0x3b8/0x920 kernel/relay.c:517 2 locks held by syz.4.21/6058: #0: ffff888140b91bf0 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0x21c/0x3d0 kernel/trace/blktrace.c:788 #1: ffffffff8df98a48 (relay_channels_mutex){+.+.}-{4:4}, at: relay_open+0x3b8/0x920 kernel/relay.c:517 2 locks held by syz.3.20/6060: #0: ffff888140b908e0 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0x21c/0x3d0 kernel/trace/blktrace.c:788 #1: ffffffff8df98a48 (relay_channels_mutex){+.+.}-{4:4}, at: relay_open+0x3b8/0x920 kernel/relay.c:517 2 locks held by syz.6.23/6210: #0: ffff888140b94210 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0x21c/0x3d0 kernel/trace/blktrace.c:788 #1: ffffffff8df98a48 (relay_channels_mutex){+.+.}-{4:4}, at: relay_open+0x3b8/0x920 kernel/relay.c:517 2 locks held by syz.5.22/6211: #0: ffff888140b92f00 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0x21c/0x3d0 kernel/trace/blktrace.c:788 #1: ffffffff8df98a48 (relay_channels_mutex){+.+.}-{4:4}, at: relay_open+0x3b8/0x920 kernel/relay.c:517 2 locks held by syz.9.26/6214: #0: ffff888140b97b40 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0x21c/0x3d0 kernel/trace/blktrace.c:788 #1: ffffffff8df98a48 (relay_channels_mutex){+.+.}-{4:4}, at: relay_open+0x3b8/0x920 kernel/relay.c:517 2 locks held by syz.7.24/6216: #0: ffff888140b95520 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0x21c/0x3d0 kernel/trace/blktrace.c:788 #1: ffffffff8df98a48 (relay_channels_mutex){+.+.}-{4:4}, at: relay_open+0x3b8/0x920 kernel/relay.c:517 2 locks held by syz.8.25/6218: #0: ffff888140b96830 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0x21c/0x3d0 kernel/trace/blktrace.c:788 #1: ffffffff8df98a48 (relay_channels_mutex){+.+.}-{4:4}, at: relay_open+0x3b8/0x920 kernel/relay.c:517 2 locks held by syz.0.27/6323: #0: ffff88814173af00 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0x21c/0x3d0 kernel/trace/blktrace.c:788 #1: ffffffff8df98a48 (relay_channels_mutex){+.+.}-{4:4}, at: relay_open+0x3b8/0x920 kernel/relay.c:517 1 lock held by syz.2.29/6335: #0: ffff88814173d520 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0x21c/0x3d0 kernel/trace/blktrace.c:788 1 lock held by syz.1.28/6340: #0: ffff88814173c210 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0x21c/0x3d0 kernel/trace/blktrace.c:788 1 lock held by syz.3.30/6342: #0: ffff888140b908e0 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0x21c/0x3d0 kernel/trace/blktrace.c:788 1 lock held by syz.4.31/6344: #0: ffff888140b91bf0 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0x21c/0x3d0 kernel/trace/blktrace.c:788 1 lock held by syz.6.32/6466: #0: ffff888140b94210 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0x21c/0x3d0 kernel/trace/blktrace.c:788 1 lock held by syz.9.34/6490: #0: ffff888140b97b40 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0x21c/0x3d0 kernel/trace/blktrace.c:788 1 lock held by syz.5.33/6494: #0: ffff888140b92f00 (&q->debugfs_mutex){+.+.}-{4:4}, at: blk_trace_setup+0x21c/0x3d0 kernel/trace/blktrace.c:788 --- 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. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup