WARNING: [] net/netfilter/nf_conntrack_core.c:2511 at nf_conntrack_cleanup_net_list+0x87e/0xa3c net/netfilter/nf_conntrack_core.c:2511, CPU#0: kworker/u8:4/8423 Modules linked in: CPU: 0 UID: 0 PID: 8423 Comm: kworker/u8:4 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: riscv-virtio,qemu (DT) Workqueue: netns cleanup_net epc : nf_conntrack_cleanup_net_list+0x87e/0xa3c net/netfilter/nf_conntrack_core.c:2511 ra : nf_conntrack_cleanup_net_list+0x87e/0xa3c net/netfilter/nf_conntrack_core.c:2511 epc : ffffffff8565700e ra : ffffffff8565700e sp : ffff8f8000da7660 gp : ffffffff8a22a0c0 tp : ffffaf801bb8b500 t0 : 1ffffffff22c0304 t1 : ffffffff8007a848 t2 : ffffffff91601820 s0 : ffff8f8000da77c0 s1 : dfffffff00000000 a0 : ffffaf801bb8b508 a1 : ffffffff86dda2c0 a2 : 0000000000000002 a3 : ffffffff8014b68c a4 : 0000000000000000 a5 : 0000000000000000 a6 : 0000000000000003 a7 : 0000000041b58ab3 s2 : ffffffff8a1133a5 s3 : 0000000000000000 s4 : 0000000000000001 s5 : ffffaf801a3cf800 s6 : 0000000000000001 s7 : 0000000000000001 s8 : fffffffef1472d94 s9 : 0000000000001000 s10: 0000000000000003 s11: 0000000000000001 t3 : ffffffff87fb2860 t4 : fffff5ef0e58ff11 t5 : fffff5ef0e58ff12 t6 : 0000000000000002 ssp : 0000000000000000 status: 0000000200000120 badaddr: ffffffff8565700e cause: 0000000000000003 [] nf_conntrack_cleanup_net_list+0x87e/0xa3c net/netfilter/nf_conntrack_core.c:2511 [] nf_conntrack_pernet_exit+0xf2/0x12c net/netfilter/nf_conntrack_standalone.c:1132 [] ops_exit_list net/core/net_namespace.c:205 [inline] [] ops_undo_list+0x3e6/0x9c4 net/core/net_namespace.c:252 [] cleanup_net+0x41e/0x8bc net/core/net_namespace.c:704 [] process_one_work+0x972/0x2124 kernel/workqueue.c:3276 [] process_scheduled_works kernel/workqueue.c:3359 [inline] [] worker_thread+0x540/0xcbc kernel/workqueue.c:3440 [] kthread+0x31c/0x444 kernel/kthread.c:436 [] ret_from_fork_kernel+0x94/0xef8 arch/riscv/kernel/process.c:230 [] ret_from_fork_kernel_asm+0x16/0x18 arch/riscv/kernel/entry.S:363