INFO: task syz-executor.4:13898 blocked for more than 143 seconds.
      Not tainted 6.7.0-rc8-syzkaller-00120-g3f14b377d01d #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D stack:23360 pid:13898 tgid:13897 ppid:5261   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0xedb/0x5af0 kernel/sched/core.c:6688
 __schedule_loop kernel/sched/core.c:6763 [inline]
 schedule+0xe9/0x270 kernel/sched/core.c:6778
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6835
 rwsem_down_write_slowpath kernel/locking/rwsem.c:1178 [inline]
 __down_write_common+0x948/0x1400 kernel/locking/rwsem.c:1306
 rdma_dev_exit_net+0x178/0x590 drivers/infiniband/core/device.c:1123
 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:170
 setup_net+0x64d/0xa40 net/core/net_namespace.c:362
 copy_net_ns+0x2f1/0x660 net/core/net_namespace.c:491
 create_new_namespaces+0x3ea/0xb10 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0xc1/0x1f0 kernel/nsproxy.c:228
 ksys_unshare+0x417/0x970 kernel/fork.c:3433
 __do_sys_unshare kernel/fork.c:3504 [inline]
 __se_sys_unshare kernel/fork.c:3502 [inline]
 __x64_sys_unshare+0x31/0x40 kernel/fork.c:3502
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7efd1847cd29
RSP: 002b:00007efd192a90c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000110
RAX: ffffffffffffffda RBX: 00007efd185abf80 RCX: 00007efd1847cd29
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000040000000
RBP: 00007efd184c947a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007efd185abf80 R15: 00007ffff17b5488
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/29:
 #0: ffffffff8cfab760 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
 #0: ffffffff8cfab760 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
 #0: ffffffff8cfab760 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6614
4 locks held by kworker/u4:4/59:
3 locks held by kworker/u4:7/1055:
2 locks held by getty/4826:
 #0: ffff88814c8b00a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc6/0x1490 drivers/tty/n_tty.c:2201
5 locks held by syz-executor.2/13878:
2 locks held by syz-executor.4/13898:
 #0: ffffffff8ea97b10 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x2cc/0x660 net/core/net_namespace.c:487
 #1: ffffffff8e779550 (rdma_nets_rwsem){++++}-{3:3}, at: rdma_dev_exit_net+0x178/0x590 drivers/infiniband/core/device.c:1123
3 locks held by syz-executor.2/13932:
 #0: ffffffff8ea97b10 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x2cc/0x660 net/core/net_namespace.c:487
 #1: ffffffff8e7797d0 (devices_rwsem){++++}-{3:3}, at: rdma_dev_init_net+0x234/0x520 drivers/infiniband/core/device.c:1179
 #2: ffffffff8e779550 (rdma_nets_rwsem){++++}-{3:3}, at: rdma_dev_init_net+0x2a7/0x520 drivers/infiniband/core/device.c:1184
3 locks held by syz-executor.4/13966:
 #0: ffffffff8ea97b10 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x2cc/0x660 net/core/net_namespace.c:487
 #1: ffffffff8e7797d0 (devices_rwsem){++++}-{3:3}, at: rdma_dev_init_net+0x234/0x520 drivers/infiniband/core/device.c:1179
 #2: ffffffff8e779550 (rdma_nets_rwsem){++++}-{3:3}, at: rdma_dev_init_net+0x2a7/0x520 drivers/infiniband/core/device.c:1184
3 locks held by syz-executor.2/13971:
 #0: ffffffff8ea97b10 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x2cc/0x660 net/core/net_namespace.c:487
 #1: ffffffff8e7797d0 (devices_rwsem){++++}-{3:3}, at: rdma_dev_init_net+0x234/0x520 drivers/infiniband/core/device.c:1179
 #2: ffffffff8e779550 (rdma_nets_rwsem){++++}-{3:3}, at: rdma_dev_init_net+0x2a7/0x520 drivers/infiniband/core/device.c:1184
3 locks held by syz-executor.4/13977:
 #0: ffffffff8ea97b10 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x2cc/0x660 net/core/net_namespace.c:487
 #1: ffffffff8e7797d0 (devices_rwsem){++++}-{3:3}, at: rdma_dev_init_net+0x234/0x520 drivers/infiniband/core/device.c:1179
 #2: ffffffff8e779550 (rdma_nets_rwsem){++++}-{3:3}, at: rdma_dev_init_net+0x2a7/0x520 drivers/infiniband/core/device.c:1184

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

NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.7.0-rc8-syzkaller-00120-g3f14b377d01d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x277/0x390 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x299/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xf87/0x1210 kernel/hung_task.c:379
 kthread+0x2c6/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 59 Comm: kworker/u4:4 Not tainted 6.7.0-rc8-syzkaller-00120-g3f14b377d01d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023
Workqueue: netns cleanup_net
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:200
Code: 06 8c da 02 66 0f 1f 44 00 00 f3 0f 1e fa 48 8b be b0 01 00 00 e8 b0 ff ff ff 31 c0 c3 66 66 2e 0f 1f 84 00 00 00 00 00 66 90 <f3> 0f 1e fa 65 48 8b 14 25 c0 bc 03 00 65 8b 05 64 4a 7c 7e a9 00
RSP: 0018:ffffc900015a7a88 EFLAGS: 00000287
RAX: 0000000000000000 RBX: 0000000000040000 RCX: ffffffff88b28969
RDX: ffff88801a2b5940 RSI: 0000000000023187 RDI: 0000000000000004
RBP: dffffc0000000000 R08: 0000000000000004 R09: 0000000000023187
R10: 0000000000040000 R11: 0000000000000004 R12: ffffc900015a7b68
R13: 0000000000023187 R14: 0000000000000001 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055f228e34a50 CR3: 00000000265ff000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 get_next_corpse net/netfilter/nf_conntrack_core.c:2353 [inline]
 nf_ct_iterate_cleanup+0xa7/0x520 net/netfilter/nf_conntrack_core.c:2406
 nf_ct_iterate_cleanup_net+0xd9/0x110 net/netfilter/nf_conntrack_core.c:2427
 nf_conntrack_cleanup_net_list+0x1d3/0x5f0 net/netfilter/nf_conntrack_core.c:2540
 ops_exit_list+0x125/0x170 net/core/net_namespace.c:175
 cleanup_net+0x505/0xb20 net/core/net_namespace.c:614
 process_one_work+0x886/0x15d0 kernel/workqueue.c:2627
 process_scheduled_works kernel/workqueue.c:2700 [inline]
 worker_thread+0x8b9/0x1290 kernel/workqueue.c:2781
 kthread+0x2c6/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>