el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606 ------------[ cut here ]------------ WARNING: net/sched/act_ct.c:437 at tcf_ct_flow_table_add net/sched/act_ct.c:437 [inline], CPU#1: syz.1.1580/11098 WARNING: net/sched/act_ct.c:437 at tcf_ct_flow_table_process_conn+0x38c/0x6e0 net/sched/act_ct.c:513, CPU#1: syz.1.1580/11098 Modules linked in: CPU: 1 UID: 0 PID: 11098 Comm: syz.1.1580 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2026 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : tcf_ct_flow_table_add net/sched/act_ct.c:437 [inline] pc : tcf_ct_flow_table_process_conn+0x38c/0x6e0 net/sched/act_ct.c:513 lr : tcf_ct_flow_table_add net/sched/act_ct.c:437 [inline] lr : tcf_ct_flow_table_process_conn+0x38c/0x6e0 net/sched/act_ct.c:513 sp : ffff800093426bc0 x29: ffff800093426bc0 x28: 1fffe0001b33cb75 x27: 0000000000000000 x26: 0000000000000000 x25: 1fffe0001963afde x24: dfff800000000000 x23: ffff0000cb1d7ef0 x22: 0000000000000088 x21: ffff0000cb1d7ec0 x20: ffff0000cb1d7e00 x19: ffff0000d673a800 x18: 0000000000000000 x17: 70202c31206c6176 x16: 0000000000000001 x15: 0000000000000000 x14: 0000000000003309 x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: 0000000000000003 x9 : 0000000000000200 x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000 x5 : 0000000000000001 x4 : 00000000ffffffff x3 : 0000000000000920 x2 : ffff0000cca44c80 x1 : ffff0000cc960000 x0 : 0000000000000000 Call trace: tcf_ct_flow_table_add net/sched/act_ct.c:437 [inline] (P) tcf_ct_flow_table_process_conn+0x38c/0x6e0 net/sched/act_ct.c:513 (P) tcf_ct_act+0x1b40/0x3928 net/sched/act_ct.c:1123 tc_act include/net/tc_wrapper.h:254 [inline] tcf_action_exec+0x164/0x51c net/sched/act_api.c:1162 tcf_exts_exec include/net/pkt_cls.h:361 [inline] mall_classify+0x150/0x21c net/sched/cls_matchall.c:42 tc_classify include/net/tc_wrapper.h:260 [inline] __tcf_classify net/sched/cls_api.c:1779 [inline] tcf_classify+0x448/0xdc0 net/sched/cls_api.c:1875 tc_run+0x394/0x6d4 net/core/dev.c:4463 sch_handle_ingress net/core/dev.c:4538 [inline] __netif_receive_skb_core+0x110c/0x2a3c net/core/dev.c:6115 __netif_receive_skb_one_core+0x70/0x110 net/core/dev.c:6262 __netif_receive_skb+0x34/0x128 net/core/dev.c:6377 netif_receive_skb_internal net/core/dev.c:6463 [inline] netif_receive_skb+0x1e0/0x888 net/core/dev.c:6522 tun_rx_batched+0x180/0x620 drivers/net/tun.c:1571 tun_get_user+0x2330/0x36d0 drivers/net/tun.c:2045 tun_chr_write_iter+0xfc/0x168 drivers/net/tun.c:2091 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x51c/0xa0c fs/read_write.c:687 ksys_write+0x12c/0x228 fs/read_write.c:739 __do_sys_write fs/read_write.c:750 [inline] __se_sys_write fs/read_write.c:747 [inline] __arm64_sys_write+0x84/0x98 fs/read_write.c:747 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606 irq event stamp: 1129 hardirqs last enabled at (1128): [] irqentry_exit_to_kernel_mode_after_preempt include/linux/irq-entry-common.h:507 [inline] hardirqs last enabled at (1128): [] __arm64_exit_to_kernel_mode+0x70/0xcc arch/arm64/kernel/entry-common.c:98 hardirqs last disabled at (1129): [] el1_brk64+0x20/0x54 arch/arm64/kernel/entry-common.c:483 softirqs last enabled at (1116): [] local_bh_enable include/linux/bottom_half.h:33 [inline] softirqs last enabled at (1116): [] tun_get_user+0x1f54/0x36d0 drivers/net/tun.c:1975 softirqs last disabled at (1118): [] local_bh_disable include/linux/bottom_half.h:20 [inline] softirqs last disabled at (1118): [] tun_rx_batched+0x144/0x620 drivers/net/tun.c:1569 ---[ end trace 0000000000000000 ]---