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charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 238650ef6c7c Merge tag 'powerpc-7.3-4' of git://git.kernel.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=15663bf9580000 kernel config: https://syzkaller.appspot.com/x/.config?x=5e4e3a0e188a497e dashboard link: https://syzkaller.appspot.com/bug?extid=6cc37aba98dac721c415 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=160653f9580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14cbebf9580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/78c78695c277/disk-238650ef.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/ed193a418b0f/vmlinux-238650ef.xz kernel image: https://storage.googleapis.com/syzbot-assets/f7a21c8aa010/bzImage-238650ef.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+6cc37aba98dac721c415@syzkaller.appspotmail.com RDX: 000000000000001c RSI: 0000200000000500 RDI: 0000000000000003 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000500 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ------------[ cut here ]------------ 1 WARNING: net/sched/act_ct.c:437 at tcf_ct_flow_table_add net/sched/act_ct.c:437 [inline], CPU#0: syz-executor278/6366 WARNING: net/sched/act_ct.c:437 at tcf_ct_flow_table_process_conn+0x449/0x7c0 net/sched/act_ct.c:513, CPU#0: syz-executor278/6366 Modules linked in: CPU: 0 UID: 0 PID: 6366 Comm: syz-executor278 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:tcf_ct_flow_table_add net/sched/act_ct.c:437 [inline] RIP: 0010:tcf_ct_flow_table_process_conn+0x449/0x7c0 net/sched/act_ct.c:513 Code: 85 81 02 00 00 41 0f b7 2f 31 ff 89 ee e8 2f 67 e9 f7 85 ed 0f 84 7c 01 00 00 e8 e2 62 e9 f7 e9 e0 01 00 00 e8 d8 62 e9 f7 90 <0f> 0b 90 e9 b2 01 00 00 e8 ca 62 e9 f7 4d 89 f7 40 84 ed 74 27 e8 RSP: 0018:ffffc900042d6ef8 EFLAGS: 00010293 RAX: ffffffff89de6f88 RBX: ffff888070202000 RCX: ffff888028c90000 RDX: 0000000000000000 RSI: ffffffff8c6da060 RDI: ffffffff8c6da020 RBP: 0000000000000000 R08: 00000000ffffffff R09: 1ffffffff1dd5cfe R10: dffffc0000000000 R11: fffffbfff1dd5cff R12: dffffc0000000000 R13: 1ffff1100e04041e R14: ffff8880702020c0 R15: 0000000000000001 FS: 000055556fc09400(0000) GS:ffff888124cd1000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffe25dff4c8 CR3: 0000000079ba6000 CR4: 00000000003526f0 Call Trace: tcf_ct_act+0x2a75/0x4050 net/sched/act_ct.c:1123 tc_act include/net/tc_wrapper.h:131 [inline] tcf_action_exec+0x185/0x8d0 net/sched/act_api.c:1162 tcf_exts_exec include/net/pkt_cls.h:361 [inline] basic_classify+0x1b2/0x2d0 net/sched/cls_basic.c:54 tc_classify include/net/tc_wrapper.h:198 [inline] __tcf_classify net/sched/cls_api.c:1779 [inline] tcf_classify+0x43d/0x1160 net/sched/cls_api.c:1875 tc_run+0x42d/0x750 net/core/dev.c:4463 sch_handle_ingress net/core/dev.c:4538 [inline] __netif_receive_skb_core+0x1443/0x30c0 net/core/dev.c:6115 __netif_receive_skb_one_core net/core/dev.c:6262 [inline] __netif_receive_skb net/core/dev.c:6377 [inline] netif_receive_skb_internal net/core/dev.c:6463 [inline] netif_receive_skb+0x1fe/0xbf0 net/core/dev.c:6522 tun_rx_batched+0x1de/0x790 drivers/net/tun.c:1571 tun_get_user+0x2be0/0x44d0 drivers/net/tun.c:2045 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:2091 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x612/0xba0 fs/read_write.c:687 ksys_write+0x150/0x270 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f6c0bc30879 Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 d8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffff5b95668 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007ffff5b95690 RCX: 00007f6c0bc30879 RDX: 000000000000001c RSI: 0000200000000500 RDI: 0000000000000003 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000500 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.