INFO: task syz-executor:14244 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:24728 pid:14244 tgid:14244 ppid:1      task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5583 [inline]
 __schedule+0x125e/0x6990 kernel/sched/core.c:7382
 __schedule_loop kernel/sched/core.c:7459 [inline]
 schedule+0xdd/0x2c0 kernel/sched/core.c:7474
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7531
 __mutex_lock_common kernel/locking/mutex.c:726 [inline]
 __mutex_lock+0xcca/0x1c10 kernel/locking/mutex.c:821
 add_one_compat_dev+0x112/0x820 drivers/infiniband/core/device.c:976
 rdma_dev_init_net+0x305/0x580 drivers/infiniband/core/device.c:1227
 ops_init+0x1e2/0x5f0 net/core/net_namespace.c:137
 setup_net+0x118/0x3a0 net/core/net_namespace.c:443
 copy_net_ns+0x340/0x7a0 net/core/net_namespace.c:582
 create_new_namespaces+0x3ea/0xac0 kernel/nsproxy.c:132
 unshare_nsproxy_namespaces+0xf6/0x210 kernel/nsproxy.c:234
 ksys_unshare+0x44f/0x980 kernel/fork.c:3293
 __do_sys_unshare kernel/fork.c:3359 [inline]
 __se_sys_unshare kernel/fork.c:3357 [inline]
 __x64_sys_unshare+0x31/0x40 kernel/fork.c:3357
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4f29fa0827
RSP: 002b:00007ffc5d2f7328 EFLAGS: 00000202 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007f4f2a225f40 RCX: 00007f4f29fa0827
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 00007f4f2a2267b8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008
R13: 0000000000000003 R14: 00007ffc5d2f7568 R15: 0000000000000000
 </TASK>

Showing all locks held in the system:
locks held by kworker/0:1/10: 2, last CPU#0:
 #0: ffff88813ff29d48 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x1461/0x1b10 kernel/workqueue.c:3470
 #1: ffffc900000f7d08 ((work_completion)(&(&gc_work->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3471
locks held by kworker/u8:1/13: 2, on CPU#0:
 #0: ffff88813ff64148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1461/0x1b10 kernel/workqueue.c:3470
 #1: ffffc90000127d08 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3471
locks held by khungtaskd/32: 1, last CPU#0:
 #0: ffffffff8ffec4a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff8ffec4a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8ffec4a0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x3d/0x184 kernel/locking/lockdep.c:6871
locks held by kworker/u8:2/43: 3, last CPU#0:
 #0: ffff88813ff64148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1461/0x1b10 kernel/workqueue.c:3470
 #1: ffffc90000b37d08 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3471
 #2: ffff8880451ac258 (&devlink->lock_key#6){+.+.}-{4:4}, at: nsim_dev_trap_report_work+0x56/0xd20 drivers/net/netdevsim/dev.c:834
locks held by kworker/u8:3/50: 3, last CPU#0:
 #0: ffff88813ff64148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1461/0x1b10 kernel/workqueue.c:3470
 #1: ffffc90000ba7d08 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3471
 #2: ffff88804f3a0258 (&devlink->lock_key#5){+.+.}-{4:4}, at: nsim_dev_trap_report_work+0x56/0xd20 drivers/net/netdevsim/dev.c:834
locks held by kworker/u8:5/88: 3, last CPU#0:
 #0: ffff88813ff64148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1461/0x1b10 kernel/workqueue.c:3470
 #1: ffffc900024bfd08 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3471
 #2: ffff88802be7e258 (&devlink->lock_key#2){+.+.}-{4:4}, at: nsim_dev_trap_report_work+0x56/0xd20 drivers/net/netdevsim/dev.c:834
locks held by syslogd/4958: 1, last CPU#0:
 #0: ffff88807e9b8e78 (&u->iolock){+.+.}-{4:4}, at: __unix_dgram_recvmsg+0x298/0xd40 net/unix/af_unix.c:2591
locks held by klogd/4965: 1, last CPU#0:
 #0: ffffffff8ffec4a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff8ffec4a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8ffec4a0 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
 #0: ffffffff8ffec4a0 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xbd/0x2090 arch/x86/kernel/unwind_orc.c:495
locks held by udevd/4976: 1, last CPU#0:
 #0: ffffffff8ffec4a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff8ffec4a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8ffec4a0 (rcu_read_lock){....}-{1:3}, at: sock_def_readable+0x90/0x600 net/core/sock.c:3736
locks held by getty/5362: 2, on CPU#0:
 #0: ffff88803a1770a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc900032432e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x419/0x1540 drivers/tty/n_tty.c:2211
locks held by syz-executor/5593: 2, last CPU#0:
 #0: ffff88802f5c9bc0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock include/linux/mmap_lock.h:600 [inline]
 #0: ffff88802f5c9bc0 (&mm->mmap_lock){++++}-{4:4}, at: exit_mmap+0x124/0xa00 mm/mmap.c:1299
 #1: ffffffff8ffec4a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #1: ffffffff8ffec4a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #1: ffffffff8ffec4a0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x2f/0x310 mm/pgtable-generic.c:290
locks held by syz-executor/5613: 1, last CPU#0:
 #0: ffff88802854c0e8 (&type->s_umount_key#35){++++}-{4:4}, at: __super_lock fs/super.c:60 [inline]
 #0: ffff88802854c0e8 (&type->s_umount_key#35){++++}-{4:4}, at: __super_lock_excl fs/super.c:75 [inline]
 #0: ffff88802854c0e8 (&type->s_umount_key#35){++++}-{4:4}, at: deactivate_super fs/super.c:613 [inline]
 #0: ffff88802854c0e8 (&type->s_umount_key#35){++++}-{4:4}, at: deactivate_super+0xe2/0x110 fs/super.c:610
locks held by kworker/u8:9/5760: 3, last CPU#0:
 #0: ffff88813ff64148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1461/0x1b10 kernel/workqueue.c:3470
 #1: ffffc9000306fd08 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3471
 #2: ffff888027be0258 (&devlink->lock_key){+.+.}-{4:4}, at: nsim_dev_trap_report_work+0x56/0xd20 drivers/net/netdevsim/dev.c:834
locks held by kworker/u8:10/5847: 2, on CPU#0:
 #0: ffff88813ff64148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1461/0x1b10 kernel/workqueue.c:3470
 #1: ffffc90002ebfd08 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3471
locks held by kworker/u8:11/5849: 8, last CPU#0:
 #0: ffff88801dec0948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x1461/0x1b10 kernel/workqueue.c:3470
 #1: ffffc90002e9fd08 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3471
 #2: ffffffff91efb468 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xb8/0x920 net/core/net_namespace.c:677
 #3: ffff88807bdec128 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1104 [inline]
 #3: ffff88807bdec128 (&dev->mutex){....}-{4:4}, at: devl_dev_lock net/devlink/devl_internal.h:124 [inline]
 #3: ffff88807bdec128 (&dev->mutex){....}-{4:4}, at: devlink_pernet_pre_exit+0x129/0x440 net/devlink/core.c:581
 #4: ffff88807bdeb258 (&devlink->lock_key#3){+.+.}-{4:4}, at: devl_lock net/devlink/core.c:314 [inline]
 #4: ffff88807bdeb258 (&devlink->lock_key#3){+.+.}-{4:4}, at: devl_dev_lock net/devlink/devl_internal.h:125 [inline]
 #4: ffff88807bdeb258 (&devlink->lock_key#3){+.+.}-{4:4}, at: devlink_pernet_pre_exit+0x13f/0x440 net/devlink/core.c:581
 #5: ffffffff91f146a0 (rtnl_mutex){+.+.}-{4:4}, at: nsim_init_netdevsim drivers/net/netdevsim/netdev.c:1068 [inline]
 #5: ffffffff91f146a0 (rtnl_mutex){+.+.}-{4:4}, at: nsim_create+0x8b5/0x12f0 drivers/net/netdevsim/netdev.c:1162
 #6: ffff888035804e98 (&dev->lock){+.+.}-{4:4}, at: netdev_lock include/linux/netdevice.h:2883 [inline]
 #6: ffff888035804e98 (&dev->lock){+.+.}-{4:4}, at: netdev_lock_ops include/net/netdev_lock.h:42 [inline]
 #6: ffff888035804e98 (&dev->lock){+.+.}-{4:4}, at: netdev_lock_ops include/net/netdev_lock.h:39 [inline]
 #6: ffff888035804e98 (&dev->lock){+.+.}-{4:4}, at: register_netdevice+0x16d5/0x26b0 net/core/dev.c:11710
 #7: ffffffff8ffec4a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #7: ffffffff8ffec4a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #7: ffffffff8ffec4a0 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
 #7: ffffffff8ffec4a0 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xbd/0x2090 arch/x86/kernel/unwind_orc.c:495
locks held by kworker/u8:12/5851: 3, last CPU#0:
 #0: ffff88813ff64148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1461/0x1b10 kernel/workqueue.c:3470
 #1: ffffc90002e6fd08 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3471
 #2: ffff8880451ac258 (&devlink->lock_key#6){+.+.}-{4:4}, at: nsim_dev_trap_report_work+0x56/0xd20 drivers/net/netdevsim/dev.c:834
locks held by kworker/u8:14/5858: 3, last CPU#0:
 #0: ffff88813ff64148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1461/0x1b10 kernel/workqueue.c:3470
 #1: ffffc90002defd08 ((work_completion)(&(&nsim_dev->trap_data->trap_report_dw)->work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3471
 #2: ffff88802be7e258 (&devlink->lock_key#2){+.+.}-{4:4}, at: nsim_dev_trap_report_work+0x56/0xd20 drivers/net/netdevsim/dev.c:834
locks held by kworker/u8:15/5864: 3, last CPU#0:
 #0: ffff88813ff64148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1461/0x1b10 kernel/workqueue.c:3470
 #1: ffffc90002f1fd08 ((work_completion)(&rdev->wiphy_work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3471
 #2: ffff88807f2f0800 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: class_wiphy_constructor include/net/cfg80211.h:6989 [inline]
 #2: ffff88807f2f0800 (&rdev->wiphy.mtx){+.+.}-{4:4}, at: cfg80211_wiphy_work+0x92/0x550 net/wireless/core.c:596
locks held by kworker/u8:6/11552: 2, last CPU#0:
 #0: ffff8880358a5148 ((wq_completion)bat_events){+.+.}-{0:0}, at: process_one_work+0x1461/0x1b10 kernel/workqueue.c:3470
 #1: ffffc90005717d08 ((work_completion)(&(&bat_priv->tt.work)->work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3471
locks held by kworker/u8:7/12052: 2, on CPU#0:
 #0: ffff88813ff64148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1461/0x1b10 kernel/workqueue.c:3470
 #1: ffffc90003ab7d08 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3471
locks held by syz-executor/14187: 2, on CPU#0:
 #0: ffffffff91efb468 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b1b9a8 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_exit_net+0x174/0x6b0 drivers/infiniband/core/device.c:1156
locks held by syz-executor/14211: 4, last CPU#0:
 #0: ffffffff91efb468 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b1bc28 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x287/0x580 drivers/infiniband/core/device.c:1221
 #2: ffffffff91b1b9a8 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x2fa/0x580 drivers/infiniband/core/device.c:1226
 #3: ffff88807a345020 (&device->compat_devs_mutex){+.+.}-{4:4}, at: add_one_compat_dev+0x112/0x820 drivers/infiniband/core/device.c:976
locks held by syz-executor/14216: 2, on CPU#0:
 #0: ffffffff91efb468 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b1b9a8 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_exit_net+0x174/0x6b0 drivers/infiniband/core/device.c:1156
locks held by syz-executor/14244: 4, on CPU#0:
 #0: ffffffff91efb468 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b1bc28 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x287/0x580 drivers/infiniband/core/device.c:1221
 #2: ffffffff91b1b9a8 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x2fa/0x580 drivers/infiniband/core/device.c:1226
 #3: ffff88807a345020 (&device->compat_devs_mutex){+.+.}-{4:4}, at: add_one_compat_dev+0x112/0x820 drivers/infiniband/core/device.c:976
locks held by syz-executor/14275: 4, on CPU#0:
 #0: ffffffff91efb468 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b1bc28 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x287/0x580 drivers/infiniband/core/device.c:1221
 #2: ffffffff91b1b9a8 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x2fa/0x580 drivers/infiniband/core/device.c:1226
 #3: ffff88807a345020 (&device->compat_devs_mutex){+.+.}-{4:4}, at: add_one_compat_dev+0x112/0x820 drivers/infiniband/core/device.c:976
locks held by syz-executor/14294: 4, on CPU#0:
 #0: ffffffff91efb468 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b1bc28 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x287/0x580 drivers/infiniband/core/device.c:1221
 #2: ffffffff91b1b9a8 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x2fa/0x580 drivers/infiniband/core/device.c:1226
 #3: ffff88807a345020 (&device->compat_devs_mutex){+.+.}-{4:4}, at: add_one_compat_dev+0x112/0x820 drivers/infiniband/core/device.c:976
locks held by syz-executor/14299: 3, on CPU#0:
 #0: ffffffff91efb468 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b1bc28 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x287/0x580 drivers/infiniband/core/device.c:1221
 #2: ffffffff91b1b9a8 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x2fa/0x580 drivers/infiniband/core/device.c:1226
locks held by syz-executor/14385: 1, on CPU#0:
 #0: ffffffff8fff89a8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x27f/0x3c0 kernel/rcu/tree_exp.h:311
locks held by kworker/u8:16/14405: 2, on CPU#0:
 #0: ffff88813ff64148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1461/0x1b10 kernel/workqueue.c:3470
 #1: ffffc900034dfd08 ((work_completion)(&sub_info->work)){+.+.}-{0:0}, at: process_one_work+0xa2c/0x1b10 kernel/workqueue.c:3471
locks held by syz-executor/14426: 3, on CPU#0:
 #0: ffffffff91efb468 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x31e/0x7a0 net/core/net_namespace.c:578
 #1: ffffffff91b1bc28 (devices_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x287/0x580 drivers/infiniband/core/device.c:1221
 #2: ffffffff91b1b9a8 (rdma_nets_rwsem){++++}-{4:4}, at: rdma_dev_init_net+0x2fa/0x580 drivers/infiniband/core/device.c:1226
locks held by udevd/14482: 4, last CPU#0:
 #0: ffff88807a743e18 (&p->lock){+.+.}-{4:4}, at: seq_read_iter+0xe1/0x1270 fs/seq_file.c:183
 #1: ffff888055358880 (&of->mutex#2){+.+.}-{4:4}, at: kernfs_seq_start+0x4f/0x2a0 fs/kernfs/file.c:165
 #2: ffff888072b20698 (kn->active#5){++++}-{0:0}, at: kernfs_get_active_of fs/kernfs/file.c:73 [inline]
 #2: ffff888072b20698 (kn->active#5){++++}-{0:0}, at: kernfs_seq_start+0xbc/0x2a0 fs/kernfs/file.c:166
 #3: ffffffff8ffec4a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #3: ffffffff8ffec4a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #3: ffffffff8ffec4a0 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
 #3: ffffffff8ffec4a0 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xbd/0x2090 arch/x86/kernel/unwind_orc.c:495
locks held by modprobe/14483: 1, last CPU#0:
 #0: ffffffff8ffec4a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff8ffec4a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8ffec4a0 (rcu_read_lock){....}-{1:3}, at: is_bpf_text_address+0x25/0x1a0 kernel/bpf/core.c:750
locks held by udevd/14485: 2, last CPU#0:
 #0: ffff88807e428460 (sb_writers#6){.+.+}-{0:0}, at: filename_unlinkat+0x1ad/0x730 fs/namei.c:5706
 #1: ffff88807e40e308 (&type->i_mutex_dir_key#5/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:1069 [inline]
 #1: ffff88807e40e308 (&type->i_mutex_dir_key#5/1){+.+.}-{4:4}, at: __start_dirop fs/namei.c:2918 [inline]
 #1: ffff88807e40e308 (&type->i_mutex_dir_key#5/1){+.+.}-{4:4}, at: start_dirop fs/namei.c:2942 [inline]
 #1: ffff88807e40e308 (&type->i_mutex_dir_key#5/1){+.+.}-{4:4}, at: filename_unlinkat+0x262/0x730 fs/namei.c:5710
locks held by syz-executor/14486: 2, last CPU#0:
 #0: ffff88807d4bd900 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:562 [inline]
 #0: ffff88807d4bd900 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1f5/0x470 mm/util.c:579
 #1: ffff888058a808b0 (&anon_vma->rwsem){++++}-{4:4}, at: anon_vma_lock_read mm/internal.h:310 [inline]
 #1: ffff888058a808b0 (&anon_vma->rwsem){++++}-{4:4}, at: validate_mm+0x1f1/0x4e0 mm/vma.c:724
locks held by modprobe/14488: 1, last CPU#0:
 #0: ffffffff8ffec4a0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff8ffec4a0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8ffec4a0 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1216 [inline]
 #0: ffffffff8ffec4a0 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xbd/0x2090 arch/x86/kernel/unwind_orc.c:495
locks held by modprobe/14492: 1, last CPU#0:
 #0: ffff88813ff53440 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:562 [inline]
 #0: ffff88813ff53440 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1f5/0x470 mm/util.c:579
locks held by modprobe/14493: 1, last CPU#0:
 #0: ffff888027dd6540 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:562 [inline]
 #0: ffff888027dd6540 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x1f5/0x470 mm/util.c:579

=============================================

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 32 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2026
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 nmi_cpu_backtrace.cold+0x12d/0x151 lib/nmi_backtrace.c:123
 nmi_trigger_cpumask_backtrace+0x21f/0x2a0 lib/nmi_backtrace.c:66
 trigger_all_cpu_backtrace include/linux/nmi.h:164 [inline]
 __sys_info lib/sys_info.c:157 [inline]
 sys_info+0x141/0x190 lib/sys_info.c:165
 check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
 watchdog+0xcb1/0x1030 kernel/hung_task.c:561
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>