Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 UID: 0 PID: 6831 Comm: kworker/u8:12 Not tainted 6.17.0-rc1-syzkaller-g8f5ae30d69d7 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Workqueue: netns cleanup_net RIP: 0010:___pcpu_freelist_pop kernel/bpf/percpu_freelist.c:114 [inline] RIP: 0010:__pcpu_freelist_pop+0x6b7/0x8c0 kernel/bpf/percpu_freelist.c:125 Code: 10 48 3b 8c 24 80 00 00 00 0f 85 b4 01 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 89 f8 48 c1 e8 03 <80> 3c 18 00 48 89 7c 24 20 74 0a e8 49 3f 41 00 48 8b 7c 24 20 48 RSP: 0018:ffffc90003f2f360 EFLAGS: 00010046 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffe8ffffd256e8 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002 RBP: ffffc90003f2f430 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff520007e5e78 R12: 1ffffd1ffffa4adc R13: ffffe8ffffd256e0 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125d1c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c37b4b5 CR3: 0000000024038000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: pcpu_freelist_pop+0xca/0x170 kernel/bpf/percpu_freelist.c:134 __bpf_get_stackid+0x574/0xcf0 kernel/bpf/stackmap.c:259 ____bpf_get_stackid_raw_tp kernel/trace/bpf_trace.c:1810 [inline] bpf_get_stackid_raw_tp+0x196/0x210 kernel/trace/bpf_trace.c:1799 bpf_prog_b724608cae728045+0x27/0x2f bpf_dispatcher_nop_func include/linux/bpf.h:1332 [inline] __bpf_prog_run include/linux/filter.h:718 [inline] bpf_prog_run include/linux/filter.h:725 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2257 [inline] bpf_trace_run2+0x284/0x4b0 kernel/trace/bpf_trace.c:2298 __do_trace_kfree include/trace/events/kmem.h:94 [inline] trace_kfree include/trace/events/kmem.h:94 [inline] kfree+0x3a0/0x440 mm/slub.c:4866 free_netdev+0x102/0x700 net/core/dev.c:11945 netdev_run_todo+0xd0c/0xea0 net/core/dev.c:11491 ops_exit_rtnl_list net/core/net_namespace.c:188 [inline] ops_undo_list+0x3e1/0x990 net/core/net_namespace.c:247 cleanup_net+0x4c5/0x800 net/core/net_namespace.c:682 process_one_work kernel/workqueue.c:3236 [inline] process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400 kthread+0x70e/0x8a0 kernel/kthread.c:463 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:___pcpu_freelist_pop kernel/bpf/percpu_freelist.c:114 [inline] RIP: 0010:__pcpu_freelist_pop+0x6b7/0x8c0 kernel/bpf/percpu_freelist.c:125 Code: 10 48 3b 8c 24 80 00 00 00 0f 85 b4 01 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 48 89 f8 48 c1 e8 03 <80> 3c 18 00 48 89 7c 24 20 74 0a e8 49 3f 41 00 48 8b 7c 24 20 48 RSP: 0018:ffffc90003f2f360 EFLAGS: 00010046 RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffffe8ffffd256e8 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002 RBP: ffffc90003f2f430 R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff520007e5e78 R12: 1ffffd1ffffa4adc R13: ffffe8ffffd256e0 R14: 0000000000000001 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888125d1c000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c37b4b5 CR3: 0000000024038000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 ---------------- Code disassembly (best guess): 0: 10 48 3b adc %cl,0x3b(%rax) 3: 8c 24 80 mov %fs,(%rax,%rax,4) 6: 00 00 add %al,(%rax) 8: 00 0f add %cl,(%rdi) a: 85 b4 01 00 00 48 8d test %esi,-0x72b80000(%rcx,%rax,1) 11: 65 d8 5b 41 fcomps %gs:0x41(%rbx) 15: 5c pop %rsp 16: 41 5d pop %r13 18: 41 5e pop %r14 1a: 41 5f pop %r15 1c: 5d pop %rbp 1d: c3 ret 1e: cc int3 1f: cc int3 20: cc int3 21: cc int3 22: cc int3 23: 48 89 f8 mov %rdi,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 80 3c 18 00 cmpb $0x0,(%rax,%rbx,1) <-- trapping instruction 2e: 48 89 7c 24 20 mov %rdi,0x20(%rsp) 33: 74 0a je 0x3f 35: e8 49 3f 41 00 call 0x413f83 3a: 48 8b 7c 24 20 mov 0x20(%rsp),%rdi 3f: 48 rex.W