BUG: unable to handle page fault for address: fffffffffffffa90 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD dfb3067 P4D dfb3067 PUD dfb5067 PMD 0 Oops: Oops: 0000 [#1] SMP KASAN PTI CPU: 0 UID: 0 PID: 14312 Comm: syz.4.2884 Tainted: G L syzkaller #0 PREEMPT_{RT,(full)} Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:strlen+0x39/0x70 lib/string.c:402 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:ffffc90004ff6f18 EFLAGS: 00010282 RAX: 0000000000000000 RBX: fffffffffffffa91 RCX: 0000000000080000 RDX: ffffc90007809000 RSI: 000000000000028e RDI: fffffffffffffa90 RBP: ffffc90004ff7048 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: fffffbfff1f5f467 R12: ffff88813fe5f700 R13: dffffc0000000000 R14: dffffc0000000000 R15: ffffffffffffffff FS: 00007f7295b366c0(0000) GS:ffff888125c3e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffffffffa90 CR3: 0000000077066000 CR4: 00000000003526f0 DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000002 DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Call Trace: __fortify_strlen include/linux/fortify-string.h:218 [inline] trace_event_get_offsets_drv_net_setup_tc net/mac80211/trace.h:2548 [inline] do_trace_event_raw_event_drv_net_setup_tc net/mac80211/trace.h:2539 [inline] trace_event_raw_event_drv_net_setup_tc+0x110/0x560 net/mac80211/trace.h:2539 __do_trace_drv_net_setup_tc net/mac80211/trace.h:2539 [inline] trace_drv_net_setup_tc net/mac80211/trace.h:2539 [inline] drv_net_setup_tc net/mac80211/driver-ops.h:1706 [inline] ieee80211_netdev_setup_tc+0x326/0x360 net/mac80211/iface.c:938 tcf_block_offload_cmd+0x235/0x3b0 net/sched/cls_api.c:838 tcf_block_offload_bind net/sched/cls_api.c:875 [inline] tcf_block_get_ext+0x1068/0x1820 net/sched/cls_api.c:1498 tcf_block_get+0x67/0xa0 net/sched/cls_api.c:1543 multiq_init+0x72/0x2b0 net/sched/sch_multiq.c:246 qdisc_create+0x7b5/0xf00 net/sched/sch_api.c:1337 __tc_modify_qdisc net/sched/sch_api.c:1771 [inline] tc_modify_qdisc+0x17af/0x2390 net/sched/sch_api.c:1835 rtnetlink_rcv_msg+0x7b9/0xc00 net/core/rtnetlink.c:7085 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2556 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline] netlink_unicast+0x7f5/0x990 net/netlink/af_netlink.c:1345 netlink_sendmsg+0x813/0xb40 net/netlink/af_netlink.c:1900 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:775 __sock_sendmsg net/socket.c:790 [inline] ____sys_sendmsg+0x565/0x870 net/socket.c:2684 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2738 __sys_sendmsg net/socket.c:2770 [inline] __do_sys_sendmsg net/socket.c:2775 [inline] __se_sys_sendmsg net/socket.c:2773 [inline] __x64_sys_sendmsg+0x1b7/0x290 net/socket.c:2773 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f72978de019 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:00007f7295b36028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f7297b65fa0 RCX: 00007f72978de019 RDX: 0000000000000000 RSI: 00002000000012c0 RDI: 0000000000000004 RBP: 00007f729797500c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7297b66038 R14: 00007f7297b65fa0 R15: 00007ffcc378b528 Modules linked in: CR2: fffffffffffffa90 ---[ end trace 0000000000000000 ]--- RIP: 0010:strlen+0x39/0x70 lib/string.c:402 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:ffffc90004ff6f18 EFLAGS: 00010282 RAX: 0000000000000000 RBX: fffffffffffffa91 RCX: 0000000000080000 RDX: ffffc90007809000 RSI: 000000000000028e RDI: fffffffffffffa90 RBP: ffffc90004ff7048 R08: 0000000000000000 R09: 0000000000000000 R10: dffffc0000000000 R11: fffffbfff1f5f467 R12: ffff88813fe5f700 R13: dffffc0000000000 R14: dffffc0000000000 R15: ffffffffffffffff FS: 00007f7295b366c0(0000) GS:ffff888125c3e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffffffffa90 CR3: 0000000077066000 CR4: 00000000003526f0 DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000002 DR3: ffffffffefffff15 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