From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f207.google.com (mail-oi1-f207.google.com [209.85.167.207]) (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 DE67E23D7CA for ; Mon, 1 Dec 2025 22:38:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.207 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764628706; cv=none; b=M2S+oZCluTXpGXcuqS2JdrhLY3z0daaKy1k6wt5BMxMg6OW0uZfuxUo7Sq4fl9VToPK/iggzVtlf2WK7HNBJ2VDhAa4LyaQbFIxct0YaJ9OMzioLVvQDU5HQ5V9z7mGepBfrddtU9xhVN4b1VTOkhjdh6OuBVeGvOtwamU/nqfY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1764628706; c=relaxed/simple; bh=RFjI6E8ndTmWBqntc+T7KYpDk1Z+7b5tS2NgPjkN2tA=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=iMMv9Ie1i5qpg2StowZNHB5eDZzUpSxvtfen9eS3PNi+7yTOTcAuQpRspDomuAtPHwcKfwjD34AhQ8psQ3ZOvORlMww08cZV4ImiYZYjWWjB561XnroVczpiLy0zD6rRSLsVomUvaagflRsw2uaMRYhZjN2PYtK8KMkTB9IUhp0= 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=209.85.167.207 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-oi1-f207.google.com with SMTP id 5614622812f47-4510650aea0so5359535b6e.3 for ; Mon, 01 Dec 2025 14:38:24 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1764628704; x=1765233504; h=to:from:subject:message-id:date:mime-version:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=vpBOTfx768fNn3WTKlJz7y3BVDwqQJT8guOVxT+nSRU=; b=sIANrZHO8iS9cD3InaXViqmxs/ajibGLBLeQrJA82ei9fBSyOPf27Wa+U1evilK8ck WexztejhfbccHgCfqTpUQjIxGtz7Eh8+5vBaA6wGoQHLzYNyyL3MhpXCKkGWJgNg7GlH zMkC10uOqFCL7VleFi97KkmLZSpvIPf9mmUJweWg5Y1BfuRpSAnmXtmOWxN+sYJ+xUrZ ScXGWIT/4lMoPtoEfbSzptJd6EbzJJ2LIKp2pWj17GmtNNfxx9GIRYLnmfEEF6/l+Yh9 0hv1WgazwmW0o55eO4ByKCubbG3DRwfuavjaNCEzFU4QnDu7C5933sDasDd0/zZqD3RH +ARw== X-Forwarded-Encrypted: i=1; AJvYcCXqNx1WRZBMkS8AXz2s11UIXeDRUBGbgGjDZNfjrSd9u5RHkbuTI6UMnADx2/pHZoiFaE/mpmYWj3W4vX0=@vger.kernel.org X-Gm-Message-State: AOJu0YyO9m43gW+nfKZnFRX9z3AovEt0PIm2WNq/RZoNVA9xQIq1hFoc tpbGDd+5ZpXHpifVNi8YG0H1GDSlMO0OvR0asR6hUVEWjlo4Gy8nNdcNgz0/NG8sWfePqBN4XCo 0V3RI5taQ7pwCElUZZb2HKq/pwRKVWIX8kswBaEGAExS+pVQMBkY4iCvN4iQ= X-Google-Smtp-Source: AGHT+IG+xZUyF60ulQ8OSvB0ohIGgxJH3XGdgBR3vYOhgepFylEETJibF/zd5nshf0r4PoZqZpBbssGiIKP2wArR6X6VNqE5bikF Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:4fe9:b0:44d:a8aa:f0ce with SMTP id 5614622812f47-451159ca970mr16413817b6e.6.1764628704019; Mon, 01 Dec 2025 14:38:24 -0800 (PST) Date: Mon, 01 Dec 2025 14:38:24 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <692e18e0.a70a0220.d98e3.018f.GAE@google.com> Subject: [syzbot] [nfs?] INFO: task hung in nfsd_nl_version_set_doit (2) From: syzbot To: Dai.Ngo@oracle.com, chuck.lever@oracle.com, jlayton@kernel.org, linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, neil@brown.name, okorniev@redhat.com, syzkaller-bugs@googlegroups.com, tom@talpey.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 7d0a66e4bb90 Linux 6.18 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=13d52512580000 kernel config: https://syzkaller.appspot.com/x/.config?x=1cd7f786c0f5182f dashboard link: https://syzkaller.appspot.com/bug?extid=31dce4175fcaed9dae98 compiler: gcc (Debian 12.2.0-14+deb12u1) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/426e88dc4200/disk-7d0a66e4.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/07f64a43f087/vmlinux-7d0a66e4.xz kernel image: https://storage.googleapis.com/syzbot-assets/43778a8316e2/bzImage-7d0a66e4.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+31dce4175fcaed9dae98@syzkaller.appspotmail.com INFO: task syz.7.3138:20679 blocked for more than 143 seconds. Tainted: G I syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.7.3138 state:D stack:27528 pid:20679 tgid:20678 ppid:19956 task_flags:0x400140 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5325 [inline] __schedule+0x1190/0x5de0 kernel/sched/core.c:6929 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:7026 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7083 __mutex_lock_common kernel/locking/mutex.c:676 [inline] __mutex_lock+0x818/0x1060 kernel/locking/mutex.c:760 nfsd_nl_version_set_doit+0xc4/0x7a0 fs/nfsd/nfsctl.c:1730 genl_family_rcv_msg_doit+0x209/0x2f0 net/netlink/genetlink.c:1115 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x55c/0x800 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2552 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x5aa/0x870 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x8c8/0xdd0 net/netlink/af_netlink.c:1896 sock_sendmsg_nosec net/socket.c:727 [inline] __sock_sendmsg net/socket.c:742 [inline] ____sys_sendmsg+0xa98/0xc70 net/socket.c:2630 ___sys_sendmsg+0x134/0x1d0 net/socket.c:2684 __sys_sendmsg+0x16d/0x220 net/socket.c:2716 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7ff6b358f7c9 RSP: 002b:00007ff6b43f7038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007ff6b37e5fa0 RCX: 00007ff6b358f7c9 RDX: 0000000004004000 RSI: 0000200000003200 RDI: 0000000000000003 RBP: 00007ff6b3613f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff6b37e6038 R14: 00007ff6b37e5fa0 R15: 00007fffed6dad48 INFO: task syz.6.3144:20706 blocked for more than 147 seconds. Tainted: G I syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.6.3144 state:D stack:27448 pid:20706 tgid:20705 ppid:19445 task_flags:0x400140 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5325 [inline] __schedule+0x1190/0x5de0 kernel/sched/core.c:6929 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0xe7/0x3a0 kernel/sched/core.c:7026 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7083 __mutex_lock_common kernel/locking/mutex.c:676 [inline] __mutex_lock+0x818/0x1060 kernel/locking/mutex.c:760 nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:593 nfsd_umount+0x48/0xe0 fs/nfsd/nfsctl.c:1347 deactivate_locked_super+0xc1/0x1a0 fs/super.c:473 deactivate_super fs/super.c:506 [inline] deactivate_super+0xde/0x100 fs/super.c:502 cleanup_mnt+0x225/0x450 fs/namespace.c:1318 task_work_run+0x150/0x240 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xec/0x130 kernel/entry/common.c:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [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+0x426/0xfa0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f70f958f7c9 RSP: 002b:00007f70fa3f9038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: fffffffffffffffe RBX: 00007f70f97e5fa0 RCX: 00007f70f958f7c9 RDX: 0000200000000100 RSI: 00002000000000c0 RDI: 0000000000000000 RBP: 00007f70f9613f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f70f97e6038 R14: 00007f70f97e5fa0 R15: 00007ffd32d60018 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffffffff8e3c45e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8e3c45e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline] #0: ffffffff8e3c45e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6775 2 locks held by kworker/1:4/5890: #0: ffff88813ff15948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3238 #1: ffffc9000456fd00 (free_ipc_work){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3239 2 locks held by kworker/u10:4/13138: #0: ffff88813ff29148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3238 #1: ffff8880b8524088 (psi_seq){-.-.}-{0:0}, at: psi_sched_switch kernel/sched/stats.h:220 [inline] #1: ffff8880b8524088 (psi_seq){-.-.}-{0:0}, at: __schedule+0x1861/0x5de0 kernel/sched/core.c:6923 2 locks held by syz.4.1989/15528: #0: ffff88806018e0e0 (&type->s_umount_key#52){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline] #0: ffff88806018e0e0 (&type->s_umount_key#52){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline] #0: ffff88806018e0e0 (&type->s_umount_key#52){++++}-{4:4}, at: deactivate_super fs/super.c:505 [inline] #0: ffff88806018e0e0 (&type->s_umount_key#52){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:502 #1: ffffffff8e7ed348 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:593 5 locks held by kworker/u10:10/18292: #0: ffff88801ba9f148 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3238 #1: ffffc90004a9fd00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3239 #2: ffffffff900d52b0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xad/0x8b0 net/core/net_namespace.c:669 #3: ffffffff900eb6c8 (rtnl_mutex){+.+.}-{4:4}, at: wiphy_unregister+0x13d/0xc50 net/wireless/core.c:1165 #4: ffff88805dad0788 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: wiphy_lock include/net/cfg80211.h:6343 [inline] #4: ffff88805dad0788 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: wiphy_unregister+0x147/0xc50 net/wireless/core.c:1166 3 locks held by kworker/u10:12/18294: #0: ffff888030d69948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3238 #1: ffffc90003eefd00 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3239 #2: ffffffff900eb6c8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline] #2: ffffffff900eb6c8 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_verify_work+0x12/0x30 net/ipv6/addrconf.c:4734 1 lock held by syz.1.2823/19276: 2 locks held by syz.5.2942/19853: #0: ffffffff9018f490 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218 #1: ffffffff8e7ed348 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_threads_set_doit+0x687/0xbc0 fs/nfsd/nfsctl.c:1590 2 locks held by getty/20629: #0: ffff88803528d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc90002fd22f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41b/0x14f0 drivers/tty/n_tty.c:2222 2 locks held by syz.7.3138/20679: #0: ffffffff9018f490 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218 #1: ffffffff8e7ed348 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_version_set_doit+0xc4/0x7a0 fs/nfsd/nfsctl.c:1730 2 locks held by syz.6.3144/20706: #0: ffff88805a2600e0 (&type->s_umount_key#52){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline] #0: ffff88805a2600e0 (&type->s_umount_key#52){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline] #0: ffff88805a2600e0 (&type->s_umount_key#52){++++}-{4:4}, at: deactivate_super fs/super.c:505 [inline] #0: ffff88805a2600e0 (&type->s_umount_key#52){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:502 #1: ffffffff8e7ed348 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:593 2 locks held by syz-executor/20776: #0: ffff88805b41e0e0 (&type->s_umount_key#52){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline] #0: ffff88805b41e0e0 (&type->s_umount_key#52){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline] #0: ffff88805b41e0e0 (&type->s_umount_key#52){++++}-{4:4}, at: deactivate_super fs/super.c:505 [inline] #0: ffff88805b41e0e0 (&type->s_umount_key#52){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:502 #1: ffffffff8e7ed348 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:593 2 locks held by syz.2.3203/21060: #0: ffff88801c3480e0 (&type->s_umount_key#52){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline] #0: ffff88801c3480e0 (&type->s_umount_key#52){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline] #0: ffff88801c3480e0 (&type->s_umount_key#52){++++}-{4:4}, at: deactivate_super fs/super.c:505 [inline] #0: ffff88801c3480e0 (&type->s_umount_key#52){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:502 #1: ffffffff8e7ed348 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:593 2 locks held by syz.3.3291/21497: #0: ffff8880753ce0e0 (&type->s_umount_key#52){++++}-{4:4}, at: __super_lock fs/super.c:57 [inline] #0: ffff8880753ce0e0 (&type->s_umount_key#52){++++}-{4:4}, at: __super_lock_excl fs/super.c:72 [inline] #0: ffff8880753ce0e0 (&type->s_umount_key#52){++++}-{4:4}, at: deactivate_super fs/super.c:505 [inline] #0: ffff8880753ce0e0 (&type->s_umount_key#52){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:502 #1: ffffffff8e7ed348 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:593 2 locks held by syz-executor/21510: #0: ffffffff8f492c00 (&ops->srcu#2){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:161 [inline] #0: ffffffff8f492c00 (&ops->srcu#2){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:253 [inline] #0: ffffffff8f492c00 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x113/0x2c0 net/core/rtnetlink.c:574 #1: ffffffff900eb6c8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline] #1: ffffffff900eb6c8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline] #1: ffffffff900eb6c8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x600/0x2000 net/core/rtnetlink.c:4064 1 lock held by syz.9.3298/21533: #0: ffffffff8e3cfb78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x1a3/0x3c0 kernel/rcu/tree_exp.h:343 5 locks held by syz.8.3302/21552: #0: ffff8880334d0dc8 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_do_close+0x26/0x90 net/bluetooth/hci_core.c:499 --- 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 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