INFO: task syz.7.3154:21137 blocked for more than 143 seconds. Not tainted 6.12.0-syzkaller-10553-gb86545e02e8c #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.7.3154 state:D stack:27248 pid:21137 tgid:21135 ppid:17656 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0xe58/0x5ad0 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6848 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6905 __mutex_lock_common kernel/locking/mutex.c:665 [inline] __mutex_lock+0x62b/0xa60 kernel/locking/mutex.c:735 nfsd_nl_listener_set_doit+0xe3/0x1b40 fs/nfsd/nfsctl.c:1964 genl_family_rcv_msg_doit+0x202/0x2f0 net/netlink/genetlink.c:1115 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline] genl_rcv_msg+0x565/0x800 net/netlink/genetlink.c:1210 netlink_rcv_skb+0x165/0x410 net/netlink/af_netlink.c:2541 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219 netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline] netlink_unicast+0x53c/0x7f0 net/netlink/af_netlink.c:1347 netlink_sendmsg+0x8b8/0xd70 net/netlink/af_netlink.c:1891 sock_sendmsg_nosec net/socket.c:711 [inline] __sock_sendmsg net/socket.c:726 [inline] ____sys_sendmsg+0x9ae/0xb40 net/socket.c:2583 ___sys_sendmsg+0x135/0x1e0 net/socket.c:2637 __sys_sendmsg+0x16e/0x220 net/socket.c:2669 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f5374180809 RSP: 002b:00007f5374f4b058 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f5374345fa0 RCX: 00007f5374180809 RDX: 0000000020000000 RSI: 0000000020005380 RDI: 0000000000000003 RBP: 00007f53741f393e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f5374345fa0 R15: 00007fffaeb97c58 INFO: task syz.2.3156:21157 blocked for more than 144 seconds. Not tainted 6.12.0-syzkaller-10553-gb86545e02e8c #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.2.3156 state:D stack:28016 pid:21157 tgid:21156 ppid:17148 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0xe58/0x5ad0 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6848 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6905 __mutex_lock_common kernel/locking/mutex.c:665 [inline] __mutex_lock+0x62b/0xa60 kernel/locking/mutex.c:735 nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625 nfsd_umount+0x48/0xe0 fs/nfsd/nfsctl.c:1428 deactivate_locked_super+0xbe/0x1a0 fs/super.c:473 deactivate_super+0xde/0x100 fs/super.c:506 cleanup_mnt+0x222/0x450 fs/namespace.c:1373 task_work_run+0x14e/0x250 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f41b6380809 RSP: 002b:00007f41b71a7058 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffea RBX: 00007f41b6545fa0 RCX: 00007f41b6380809 RDX: 0000000020000280 RSI: 0000000020000000 RDI: 0000000000000000 RBP: 00007f41b63f393e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f41b6545fa0 R15: 00007fffb51d09b8 INFO: task syz-executor:21170 blocked for more than 144 seconds. Not tainted 6.12.0-syzkaller-10553-gb86545e02e8c #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:23888 pid:21170 tgid:21170 ppid:1 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0xe58/0x5ad0 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6848 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6905 __mutex_lock_common kernel/locking/mutex.c:665 [inline] __mutex_lock+0x62b/0xa60 kernel/locking/mutex.c:735 nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625 nfsd_umount+0x48/0xe0 fs/nfsd/nfsctl.c:1428 deactivate_locked_super+0xbe/0x1a0 fs/super.c:473 deactivate_super+0xde/0x100 fs/super.c:506 cleanup_mnt+0x222/0x450 fs/namespace.c:1373 task_work_run+0x14e/0x250 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x27b/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4f7b381b37 RSP: 002b:00007ffc3eb36698 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007f4f7b3f37dc RCX: 00007f4f7b381b37 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffc3eb377d0 RBP: 00007ffc3eb377bc R08: 0000000000000000 R09: 00007f4f7c0f5000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc3eb377d0 R13: 00007f4f7b3f37dc R14: 00000000000ccca2 R15: 00007ffc3eb37810 Showing all locks held in the system: 1 lock held by pool_workqueue_/3: #0: ffffffff8dfc6938 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x1a4/0x3b0 kernel/rcu/tree_exp.h:329 3 locks held by kworker/0:0/8: #0: ffff8880b863ebd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:598 #1: ffff8880b8628a88 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x2c1/0x8e0 kernel/sched/psi.c:987 #2: ffffffff8eb1ccf8 (pool_lock#2){-.-.}-{2:2}, at: class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:551 [inline] #2: ffffffff8eb1ccf8 (pool_lock#2){-.-.}-{2:2}, at: free_obj_work+0x1ac/0x390 lib/debugobjects.c:498 1 lock held by khungtaskd/30: #0: ffffffff8dfbb000 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8dfbb000 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8dfbb000 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6744 2 locks held by getty/5608: #0: ffff88814d3550a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc9000330b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211 2 locks held by syz.8.3045/20682: #0: ffff88805bc820e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff88805bc820e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88805bc820e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e3bbe28 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625 2 locks held by syz.6.3111/20951: #0: ffffffff8fd74490 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218 #1: ffffffff8e3bbe28 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_listener_set_doit+0xe3/0x1b40 fs/nfsd/nfsctl.c:1964 2 locks held by syz.7.3154/21137: #0: ffffffff8fd74490 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218 #1: ffffffff8e3bbe28 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_listener_set_doit+0xe3/0x1b40 fs/nfsd/nfsctl.c:1964 2 locks held by syz.2.3156/21157: #0: ffff8880437f40e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff8880437f40e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff8880437f40e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e3bbe28 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625 2 locks held by syz-executor/21170: #0: ffff88804d2880e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff88804d2880e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88804d2880e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e3bbe28 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625 2 locks held by syz-executor/21777: #0: ffff8880616580e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff8880616580e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff8880616580e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e3bbe28 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625 2 locks held by syz.1.3265/22002: #0: ffffffff8fd74490 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218 #1: ffffffff8e3bbe28 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_version_set_doit+0xc5/0x7a0 fs/nfsd/nfsctl.c:1813 2 locks held by syz-executor/22394: #0: ffff888043d1e0e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff888043d1e0e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff888043d1e0e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e3bbe28 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625 2 locks held by kworker/u8:54/22994: #0: ffff8880b873ebd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:598 #1: ffffc9000bd3fd80 ((work_completion)(&rdev->wiphy_work)){+.+.}-{0:0}, at: process_one_work+0x8bb/0x1b30 kernel/workqueue.c:3205 3 locks held by kworker/u8:56/22996: #0: ffff888030403948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x126b/0x1b30 kernel/workqueue.c:3204 #1: ffffc90005c37d80 ((work_completion)(&(&net->ipv6.addr_chk_work)->work)){+.+.}-{0:0}, at: process_one_work+0x8bb/0x1b30 kernel/workqueue.c:3205 #2: ffffffff8fcd5748 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_verify_work+0x12/0x30 net/ipv6/addrconf.c:4736 3 locks held by kworker/u8:57/22997: 2 locks held by syz-executor/23461: #0: ffff88807d2ae0e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff88807d2ae0e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88807d2ae0e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e3bbe28 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625 2 locks held by syz.0.3505/23921: #0: ffff88805c28a0e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff88805c28a0e0 (&type->s_umount_key#49){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88805c28a0e0 (&type->s_umount_key#49){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505 #1: ffffffff8e3bbe28 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_shutdown_threads+0x5b/0xf0 fs/nfsd/nfssvc.c:625 2 locks held by syz-executor/24177: #0: ffffffff8fcd5748 (rtnl_mutex){+.+.}-{4:4}, at: tun_detach drivers/net/tun.c:698 [inline] #0: ffffffff8fcd5748 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x38/0x230 drivers/net/tun.c:3517 #1: ffffffff8dfc6938 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x1a4/0x3b0 kernel/rcu/tree_exp.h:329 2 locks held by syz.7.3597/24455: 2 locks held by syz-executor/24465: #0: ffff88809ec8cd80 (&hdev->req_lock){+.+.}-{4:4}, at: hci_dev_do_close+0x26/0x90 net/bluetooth/hci_core.c:481 #1: ffff88809ec8c078 (&hdev->lock){+.+.}-{4:4}, at: hci_dev_close_sync+0x34c/0x1250 net/bluetooth/hci_sync.c:5200 2 locks held by syz.6.3612/24524: #0: ffffffff8fd74490 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218 #1: ffffffff8e3bbe28 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_threads_set_doit+0x694/0xbe0 fs/nfsd/nfsctl.c:1671 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-syzkaller-10553-gb86545e02e8c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:234 [inline] watchdog+0xf14/0x1240 kernel/hung_task.c:397 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 5216 Comm: klogd Not tainted 6.12.0-syzkaller-10553-gb86545e02e8c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:__list_del_entry_valid_or_report+0x20/0x1c0 lib/list_debug.c:49 Code: 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 89 fe 48 83 c7 08 48 83 ec 18 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 19 01 00 00 48 89 f2 48 8b 4e 08 48 b8 00 00 00 RSP: 0018:ffffc90002f87618 EFLAGS: 00000802 RAX: dffffc0000000000 RBX: 00000000000b11d1 RCX: 0000000000000020 RDX: 1ffffd4000588e8a RSI: ffffea0002c47448 RDI: ffffea0002c47450 RBP: ffffea0002c47440 R08: 0000000000000000 R09: fffffbfff207cbd2 R10: ffffffff903e5e97 R11: dffffc0000000000 R12: ffffea0002c47448 R13: ffff8880b8744c40 R14: 0000000000000153 R15: dffffc0000000000 FS: 00007f182cc39380(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000f98000 CR3: 0000000032774000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __list_del_entry_valid include/linux/list.h:124 [inline] __list_del_entry include/linux/list.h:215 [inline] list_del include/linux/list.h:229 [inline] free_pcppages_bulk+0x1ff/0x630 mm/page_alloc.c:1216 free_unref_page_commit+0x515/0xfe0 mm/page_alloc.c:2632 free_unref_page+0x6e3/0x1080 mm/page_alloc.c:2680 __put_partials+0x14c/0x170 mm/slub.c:3142 qlink_free mm/kasan/quarantine.c:163 [inline] qlist_free_all+0x4e/0x120 mm/kasan/quarantine.c:179 kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286 __kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329 kasan_slab_alloc include/linux/kasan.h:250 [inline] slab_post_alloc_hook mm/slub.c:4104 [inline] slab_alloc_node mm/slub.c:4153 [inline] __do_kmalloc_node mm/slub.c:4282 [inline] __kmalloc_node_track_caller_noprof+0x1ce/0x520 mm/slub.c:4302 kmalloc_reserve+0xef/0x2c0 net/core/skbuff.c:609 __alloc_skb+0x164/0x380 net/core/skbuff.c:678 alloc_skb include/linux/skbuff.h:1323 [inline] alloc_skb_with_frags+0xe4/0x850 net/core/skbuff.c:6612 sock_alloc_send_pskb+0x7f1/0x980 net/core/sock.c:2881 unix_dgram_sendmsg+0x46c/0x1940 net/unix/af_unix.c:2027 sock_sendmsg_nosec net/socket.c:711 [inline] __sock_sendmsg net/socket.c:726 [inline] __sys_sendto+0x488/0x4f0 net/socket.c:2197 __do_sys_sendto net/socket.c:2204 [inline] __se_sys_sendto net/socket.c:2200 [inline] __x64_sys_sendto+0xe0/0x1c0 net/socket.c:2200 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f182cd9b9b5 Code: 8b 44 24 08 48 83 c4 28 48 98 c3 48 98 c3 41 89 ca 64 8b 04 25 18 00 00 00 85 c0 75 26 45 31 c9 45 31 c0 b8 2c 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 7a 48 8b 15 44 c4 0c 00 f7 d8 64 89 02 48 83 RSP: 002b:00007ffe48c9b1c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f182cd9b9b5 RDX: 0000000000000049 RSI: 000055a66cdfa6d0 RDI: 0000000000000003 RBP: 000055a66cdf4910 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000004000 R11: 0000000000000246 R12: 0000000000000013 R13: 00007f182cf29212 R14: 00007ffe48c9b2c8 R15: 0000000000000000