general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 1 PID: 18713 Comm: syz.0.4270 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:bpf_overflow_handler+0x115/0x370 kernel/events/core.c:9868 Code: 00 00 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 ad 5e 1a 00 4c 8b 2b 49 8d 5d 38 49 83 c5 30 4c 89 e8 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 ef e8 8c 5e 1a 00 4c 89 e7 48 89 de 41 RSP: 0018:ffffc90001917020 EFLAGS: 00010206 RAX: 0000000000000006 RBX: 0000000000000038 RCX: ffff88810b2fbc00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90001917108 R08: ffff888118257b4b R09: 1ffff1102304af69 R10: dffffc0000000000 R11: ffffed102304af6a R12: ffffc90001917080 R13: 0000000000000030 R14: 1ffff92000322e0c R15: dffffc0000000000 FS: 00007f96a52166c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000003e000 CR3: 000000011c3eb000 CR4: 00000000003506a0 DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __perf_event_overflow+0x19d/0x350 kernel/events/core.c:9092 perf_swevent_overflow kernel/events/core.c:9168 [inline] perf_swevent_event+0x2f5/0x540 kernel/events/core.c:-1 do_perf_sw_event kernel/events/core.c:9309 [inline] ___perf_sw_event+0x394/0x4c0 kernel/events/core.c:9340 __perf_sw_event+0x134/0x270 kernel/events/core.c:9352 perf_sw_event include/linux/perf_event.h:1179 [inline] do_user_addr_fault+0xdfb/0xe20 arch/x86/mm/fault.c:1236 handle_page_fault arch/x86/mm/fault.c:1436 [inline] exc_page_fault+0x5a/0xc0 arch/x86/mm/fault.c:1492 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:571 RIP: 0010:copy_user_enhanced_fast_string+0xe/0x40 arch/x86/lib/copy_user_64.S:206 Code: 89 d1 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 31 c0 0f 01 ca c3 90 90 90 90 90 90 90 0f 01 cb 83 fa 40 0f 82 70 ff ff ff 89 d1 a4 31 c0 0f 01 ca c3 90 90 90 90 90 90 90 90 90 90 89 d1 83 f8 RSP: 0018:ffffc90001917630 EFLAGS: 00050206 RAX: ffffffff823c7701 RBX: ffff888119ee00c8 RCX: 0000000000002880 RDX: 00000000000101d0 RSI: 000020000003e000 RDI: ffff888119eeda18 RBP: ffffc900019176a8 R08: ffff888119ef0297 R09: 1ffff110233de052 R10: dffffc0000000000 R11: ffffed10233de053 R12: 00000000000101ff R13: 00002000000306b0 R14: 00000000000101d0 R15: 0000200000040880 copy_from_iter_full include/linux/uio.h:172 [inline] tipc_msg_build+0x406/0xc70 net/tipc/msg.c:424 __tipc_sendstream+0x9a0/0x1780 net/tipc/socket.c:1614 tipc_sendstream+0x55/0x70 net/tipc/socket.c:1545 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] ____sys_sendmsg+0x5be/0x8f0 net/socket.c:2377 ___sys_sendmsg+0x236/0x2e0 net/socket.c:2431 __sys_sendmsg net/socket.c:2460 [inline] __do_sys_sendmsg net/socket.c:2469 [inline] __se_sys_sendmsg net/socket.c:2467 [inline] __x64_sys_sendmsg+0x201/0x2d0 net/socket.c:2467 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f96a67bd159 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:00007f96a5216028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007f96a6a44fa0 RCX: 00007f96a67bd159 RDX: 0000000000000000 RSI: 0000200000000240 RDI: 0000000000000060 RBP: 00007f96a685403b R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f96a6a45038 R14: 00007f96a6a44fa0 R15: 00007fff41621ef8 Modules linked in: ---[ end trace 3c5e5dd302c6106f ]--- RIP: 0010:bpf_overflow_handler+0x115/0x370 kernel/events/core.c:9868 Code: 00 00 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 ad 5e 1a 00 4c 8b 2b 49 8d 5d 38 49 83 c5 30 4c 89 e8 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 ef e8 8c 5e 1a 00 4c 89 e7 48 89 de 41 RSP: 0018:ffffc90001917020 EFLAGS: 00010206 RAX: 0000000000000006 RBX: 0000000000000038 RCX: ffff88810b2fbc00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc90001917108 R08: ffff888118257b4b R09: 1ffff1102304af69 R10: dffffc0000000000 R11: ffffed102304af6a R12: ffffc90001917080 R13: 0000000000000030 R14: 1ffff92000322e0c R15: dffffc0000000000 FS: 00007f96a52166c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000003e000 CR3: 000000011c3eb000 CR4: 00000000003506a0 DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 ---------------- Code disassembly (best guess): 0: 00 00 add %al,(%rax) 2: 48 89 d8 mov %rbx,%rax 5: 48 c1 e8 03 shr $0x3,%rax 9: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) e: 74 08 je 0x18 10: 48 89 df mov %rbx,%rdi 13: e8 ad 5e 1a 00 call 0x1a5ec5 18: 4c 8b 2b mov (%rbx),%r13 1b: 49 8d 5d 38 lea 0x38(%r13),%rbx 1f: 49 83 c5 30 add $0x30,%r13 23: 4c 89 e8 mov %r13,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 4c 89 ef mov %r13,%rdi 34: e8 8c 5e 1a 00 call 0x1a5ec5 39: 4c 89 e7 mov %r12,%rdi 3c: 48 89 de mov %rbx,%rsi 3f: 41 rex.B