BUG: unable to handle page fault for address: fffffffffffffbc8 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD cf35067 P4D cf35067 PUD cf37067 PMD 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 14707 Comm: syz.2.2423 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:strlen+0x39/0x70 lib/string.c:425 Code: ff ff ff 49 be 00 00 00 00 00 fc ff df 48 89 fb 49 89 c7 48 89 d8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 11 48 ff c3 49 8d 47 01 <42> 80 7c 3f 01 00 75 de eb 19 89 d9 80 e1 07 38 c1 7c e6 49 89 fc RSP: 0018:ffffc9000b9cea98 EFLAGS: 00010286 RAX: 0000000000000000 RBX: fffffffffffffbc9 RCX: 0000000000080000 RDX: ffffc9000d4e4000 RSI: 0000000000000bdf RDI: fffffffffffffbc8 RBP: ffffc9000b9cebc8 R08: ffffffff8e8c7aef R09: 1ffffffff1d18f5d R10: dffffc0000000000 R11: fffffbfff1d18f5e R12: dffffc0000000000 R13: ffff888018666680 R14: dffffc0000000000 R15: ffffffffffffffff FS: 00007ff66d1ae6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffffffffbc8 CR3: 0000000042074000 CR4: 00000000003506f0 DR0: 0000000000000008 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 000000000000000e DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: __fortify_strlen include/linux/fortify-string.h:228 [inline] trace_event_get_offsets_drv_net_setup_tc net/mac80211/trace.h:2499 [inline] do_trace_event_raw_event_drv_net_setup_tc net/mac80211/trace.h:2490 [inline] trace_event_raw_event_drv_net_setup_tc+0x109/0x4d0 net/mac80211/trace.h:2490 trace_drv_net_setup_tc net/mac80211/trace.h:2490 [inline] drv_net_setup_tc net/mac80211/driver-ops.h:1538 [inline] ieee80211_netdev_setup_tc+0x2c2/0x320 net/mac80211/iface.c:879 tcf_block_offload_cmd+0x235/0x3a0 net/sched/cls_api.c:809 tcf_block_offload_bind net/sched/cls_api.c:846 [inline] tcf_block_get_ext+0xdf2/0x13d0 net/sched/cls_api.c:1458 tcf_block_get+0x68/0xa0 net/sched/cls_api.c:1493 htb_init+0x1f8/0xdc0 net/sched/sch_htb.c:1068 qdisc_create+0x90f/0x1060 net/sched/sch_api.c:1317 tc_modify_qdisc+0xb47/0x1de0 net/sched/sch_api.c:-1 rtnetlink_rcv_msg+0x843/0xf90 net/core/rtnetlink.c:6484 netlink_rcv_skb+0x235/0x4c0 net/netlink/af_netlink.c:2550 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline] netlink_unicast+0x7b1/0x930 net/netlink/af_netlink.c:1346 netlink_sendmsg+0x8d0/0xbf0 net/netlink/af_netlink.c:1899 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg net/socket.c:745 [inline] ____sys_sendmsg+0x61b/0x980 net/socket.c:2595 ___sys_sendmsg+0x2a6/0x360 net/socket.c:2649 __sys_sendmsg net/socket.c:2678 [inline] __do_sys_sendmsg net/socket.c:2687 [inline] __se_sys_sendmsg+0x1d0/0x2c0 net/socket.c:2685 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7ff66c39e019 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff66d1ae028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007ff66c625fa0 RCX: 00007ff66c39e019 RDX: 0000000020040084 RSI: 00002000000012c0 RDI: 0000000000000005 RBP: 00007ff66c43500c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ff66c626038 R14: 00007ff66c625fa0 R15: 00007ffd627ff908 Modules linked in: CR2: fffffffffffffbc8 ---[ end trace 0000000000000000 ]--- RIP: 0010:strlen+0x39/0x70 lib/string.c:425 Code: ff ff ff 49 be 00 00 00 00 00 fc ff df 48 89 fb 49 89 c7 48 89 d8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 11 48 ff c3 49 8d 47 01 <42> 80 7c 3f 01 00 75 de eb 19 89 d9 80 e1 07 38 c1 7c e6 49 89 fc RSP: 0018:ffffc9000b9cea98 EFLAGS: 00010286 RAX: 0000000000000000 RBX: fffffffffffffbc9 RCX: 0000000000080000 RDX: ffffc9000d4e4000 RSI: 0000000000000bdf RDI: fffffffffffffbc8 RBP: ffffc9000b9cebc8 R08: ffffffff8e8c7aef R09: 1ffffffff1d18f5d R10: dffffc0000000000 R11: fffffbfff1d18f5e R12: dffffc0000000000 R13: ffff888018666680 R14: dffffc0000000000 R15: ffffffffffffffff FS: 00007ff66d1ae6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffffffffbc8 CR3: 0000000042074000 CR4: 00000000003506f0 DR0: 0000000000000008 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 000000000000000e DR6: 00000000ffff0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: ff 49 be decl -0x42(%rcx) 3: 00 00 add %al,(%rax) 5: 00 00 add %al,(%rax) 7: 00 fc add %bh,%ah 9: ff lcall (bad) a: df 48 89 fisttps -0x77(%rax) d: fb sti e: 49 89 c7 mov %rax,%r15 11: 48 89 d8 mov %rbx,%rax 14: 48 c1 e8 03 shr $0x3,%rax 18: 42 0f b6 04 30 movzbl (%rax,%r14,1),%eax 1d: 84 c0 test %al,%al 1f: 75 11 jne 0x32 21: 48 ff c3 inc %rbx 24: 49 8d 47 01 lea 0x1(%r15),%rax * 28: 42 80 7c 3f 01 00 cmpb $0x0,0x1(%rdi,%r15,1) <-- trapping instruction 2e: 75 de jne 0xe 30: eb 19 jmp 0x4b 32: 89 d9 mov %ebx,%ecx 34: 80 e1 07 and $0x7,%cl 37: 38 c1 cmp %al,%cl 39: 7c e6 jl 0x21 3b: 49 89 fc mov %rdi,%r12