From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f78.google.com (mail-io1-f78.google.com [209.85.166.78]) (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 D95311A0BFD for ; Sun, 3 Aug 2025 18:20:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.78 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754245233; cv=none; b=TKVMWwhhMlgj+XOWc6ipZ1uXaJ27f79DAV9tdySorJcLeJwe/KxdOgzIltbdyfwZ9ZR1J8RZipB6+F/0NHaX41g4YaidNwkIOeYTBexmoxgBRmwpHZJm0zAUbsbHkeWjiRFHmNu7ITc56w8IWMtnfRQUuERKTpDELgr8B9mt1Lk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754245233; c=relaxed/simple; bh=NjjVo3lWZzu8pGRMNj93L0tybbl5TltHD0egOYfdCQo=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=M8KJQTegznSIstQ7mH0NgranSJbWquh9oR2siQo3WZKcc1ipne9V1b2l5bF90tIzrAwpTe80BWlLdaKjDE6FCjkQIYrZPucv4ow4BBzN5pE/6WBt6212loMFtPU2SP08OTz60EB0ZWvntk6qEMgLm+bIxDvypjqoehHM1wbndVU= 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=209.85.166.78 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-io1-f78.google.com with SMTP id ca18e2360f4ac-881855cd566so4158939f.2 for ; Sun, 03 Aug 2025 11:20:31 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1754245231; x=1754850031; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=UGNWppTo5YZzyltnum5m/mtHptC81GgrgQ89+dFnk60=; b=MnyC4YpqOjc4eb2NkdEXgKhAAF90H+P/Gr2Mu7hqUjweZgRaTvAErRKAfuOMrapsQn x2k7LOGMaGOJBPOxR2i48Ern2EC9sGc5wnru9LvMPebgi3cusgbdWbM/8Lx7H3SCBO+H bLwD+ilzkCtbruBSnA+QlXQD81IcvwK6a2rQoPweh1SNsjqysBQ/a/jABT6wk3CSG0G2 EyzZL8ZEWR6XsnbPLcZojQOl0yakfAXH+IcPmlGmnicjMiYJX8GB4FH4jLxPVBrOzfjn 3YkxOwPm458xuyjb2E/AHTjPOWU9ADoB0QIfRsDNpEF6XQFQukN1+zjLIKtvGVjRw6xO KBFw== X-Forwarded-Encrypted: i=1; AJvYcCXsDaVHrdVe2kRAzjqocdA6CnywXpfpdX59USr55rNG1CR/t6294n3tHYbrP0H7KRA+y00isza+KByE+Fw=@vger.kernel.org X-Gm-Message-State: AOJu0Yy7/AGwk84YuLXxzqqthuPeqYPKhcAM1+shBsr61XEkrQOm5sx8 nf4Y8ahP2ORfXBDSVrXsfcN43m8Zg/RLteCqui4HUTlB4WwZKekwtKA+L/7+8gqDNY6npATr/mo stKHqp7raJwKZG+CXXUXbVoF8Vr87UYIxiWXz2n7bQl0kUM0QeA9gdq8MzSI= X-Google-Smtp-Source: AGHT+IEE+d3/OmO1kJZBGH685TlEbaME/y+31MbEM7I9PkI87JkptKndiWDN2q9+WWTBrAXRIBw/H7S/+3Z74JeXq9KI5558VFwI Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:260e:b0:3df:4ad5:3a71 with SMTP id e9e14a558f8ab-3e416191e61mr118995105ab.11.1754245230972; Sun, 03 Aug 2025 11:20:30 -0700 (PDT) Date: Sun, 03 Aug 2025 11:20:30 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <688fa86e.050a0220.1fc43d.0005.GAE@google.com> Subject: [syzbot] [kernel?] INFO: task hung in vfs_coredump (2) From: syzbot To: anna-maria@linutronix.de, frederic@kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com, tglx@linutronix.de Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: d086c886ceb9 Add linux-next specific files for 20250718 git tree: linux-next console+strace: https://syzkaller.appspot.com/x/log.txt?x=127b0ca2580000 kernel config: https://syzkaller.appspot.com/x/.config?x=69896dd7b8c4e81e dashboard link: https://syzkaller.appspot.com/bug?extid=6ed94e81a1492fe1d512 compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12dbcca2580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13238834580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/54504fbc2437/disk-d086c886.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b427b00abffe/vmlinux-d086c886.xz kernel image: https://storage.googleapis.com/syzbot-assets/5a87731b006b/bzImage-d086c886.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6ed94e81a1492fe1d512@syzkaller.appspotmail.com INFO: task syz-executor104:5856 blocked for more than 143 seconds. Not tainted 6.16.0-rc6-next-20250718-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor104 state:D stack:26808 pid:5856 tgid:5854 ppid:5853 task_flags:0x400640 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5351 [inline] __schedule+0x1737/0x4d30 kernel/sched/core.c:6954 __schedule_loop kernel/sched/core.c:7036 [inline] schedule+0x165/0x360 kernel/sched/core.c:7051 schedule_timeout+0x9a/0x270 kernel/time/sleep_timeout.c:75 do_wait_for_common kernel/sched/completion.c:100 [inline] __wait_for_common+0x3da/0x710 kernel/sched/completion.c:121 wait_for_common kernel/sched/completion.c:132 [inline] wait_for_completion_state+0x1c/0x40 kernel/sched/completion.c:269 coredump_wait fs/coredump.c:534 [inline] vfs_coredump+0x8c2/0x2ab0 fs/coredump.c:1128 get_signal+0x1109/0x1340 kernel/signal.c:3019 arch_do_signal_or_restart+0x9a/0x750 arch/x86/kernel/signal.c:337 exit_to_user_mode_loop+0x75/0x110 kernel/entry/common.c:40 exit_to_user_mode_prepare include/linux/irq-entry-common.h:208 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x2bd/0x3b0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7bc88c77a9 RSP: 002b:00007f7bc885f198 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: 00000000000000ca RBX: 00007f7bc89513f8 RCX: 00007f7bc88c77a9 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f7bc89513fc RBP: 00007f7bc89513f0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f7bc891e0c4 R13: 000000000000006e R14: 00002000000003c0 R15: 00002000000001c0 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffffffff8e53d8a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8e53d8a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #0: ffffffff8e53d8a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770 2 locks held by getty/5611: #0: ffff88814d1c60a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900036cc2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-rc6-next-20250718-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline] watchdog+0xf93/0xfe0 kernel/hung_task.c:491 kthread+0x70e/0x8a0 kernel/kthread.c:463 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted 6.16.0-rc6-next-20250718-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:82 Code: d3 e8 02 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 13 ba 28 00 f3 0f 1e fa fb f4 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 RSP: 0018:ffffc90000197de0 EFLAGS: 000002c2 RAX: eba1d665c07d2f00 RBX: ffffffff8196da38 RCX: eba1d665c07d2f00 RDX: 0000000000000001 RSI: ffffffff8dc6a0fe RDI: ffffffff8c04d400 RBP: ffffc90000197f20 R08: ffff8880b8732f5b R09: 1ffff110170e65eb R10: dffffc0000000000 R11: ffffed10170e65ec R12: ffffffff8fe3cf30 R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff11003a55b40 FS: 0000000000000000(0000) GS:ffff8881258ab000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000563b2a68e168 CR3: 000000000e338000 CR4: 00000000003526f0 Call Trace: arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline] default_idle+0x13/0x20 arch/x86/kernel/process.c:757 default_idle_call+0x74/0xb0 kernel/sched/idle.c:122 cpuidle_idle_call kernel/sched/idle.c:190 [inline] do_idle+0x1e8/0x510 kernel/sched/idle.c:330 cpu_startup_entry+0x44/0x60 kernel/sched/idle.c:428 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:315 common_startup_64+0x13e/0x147 --- 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