general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027] CPU: 0 PID: 15933 Comm: syz.1.23212 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026 RIP: 0010:bpf_overflow_handler+0x288/0x370 kernel/events/core.c:9862 Code: ff 55 00 41 89 c4 42 80 3c 3b 00 74 0a 48 8b 7c 24 10 e8 6b 67 1a 00 48 8b 44 24 10 4c 8b 28 49 83 c5 20 4c 89 e8 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 ef e8 49 67 1a 00 bb 70 02 00 00 49 03 RSP: 0018:ffffc900012fef00 EFLAGS: 00010202 RAX: 0000000000000004 RBX: 1ffff11028e5e979 RCX: 0a15d6387ca65200 RDX: ffffc90007a19000 RSI: 0000000000000a06 RDI: 00000000ffffffff RBP: ffffc900012ff000 R08: ffff8881000554b7 R09: 1ffff1102000aa96 R10: dffffc0000000000 R11: ffffed102000aa97 R12: 0000000000000004 R13: 0000000000000020 R14: 1ffff9200025fde8 R15: dffffc0000000000 FS: 00007fa25b4586c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000647000 CR3: 000000013da71000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __perf_event_overflow+0x1b3/0x340 kernel/events/core.c:9086 perf_swevent_overflow kernel/events/core.c:9162 [inline] perf_swevent_event+0x2f7/0x530 kernel/events/core.c:-1 do_perf_sw_event kernel/events/core.c:9303 [inline] ___perf_sw_event+0x3aa/0x4d0 kernel/events/core.c:9334 __perf_sw_event+0x134/0x270 kernel/events/core.c:9346 perf_sw_event include/linux/perf_event.h:1179 [inline] do_user_addr_fault+0xdc2/0xde0 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:ffffc900012ff568 EFLAGS: 00050206 RAX: ffffffff823cab01 RBX: 0000200000645640 RCX: 0000000000006640 RDX: 0000000000008000 RSI: ffff88811f1b19c0 RDI: 0000200000647000 RBP: ffffc900012ff618 R08: ffff88811f1b7fff R09: 1ffff11023e36fff R10: dffffc0000000000 R11: ffffed1023e37000 R12: 0000000000008000 R13: 00007ffffffff000 R14: ffff88811f1b0000 R15: 00000000000080ff copy_to_iter include/linux/uio.h:151 [inline] simple_copy_to_iter+0x50/0x70 net/core/datagram.c:519 __skb_datagram_iter+0x2c2/0x700 net/core/datagram.c:448 skb_copy_datagram_iter+0x43/0x150 net/core/datagram.c:533 skb_copy_datagram_msg include/linux/skbuff.h:3643 [inline] unix_stream_read_actor+0x6f/0xc0 net/unix/af_unix.c:2503 unix_stream_read_generic+0x987/0x1d40 net/unix/af_unix.c:2422 unix_stream_recvmsg+0xd8/0x130 net/unix/af_unix.c:2519 ____sys_recvmsg+0x2cd/0x5e0 net/socket.c:-1 ___sys_recvmsg+0x21a/0x5c0 net/socket.c:2637 __sys_recvmsg net/socket.c:2667 [inline] __do_sys_recvmsg net/socket.c:2677 [inline] __se_sys_recvmsg net/socket.c:2674 [inline] __x64_sys_recvmsg+0x1f6/0x2c0 net/socket.c:2674 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7fa25c9fde59 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:00007fa25b458028 EFLAGS: 00000246 ORIG_RAX: 000000000000002f RAX: ffffffffffffffda RBX: 00007fa25cc76fa0 RCX: 00007fa25c9fde59 RDX: 0000000040000100 RSI: 0000200000001140 RDI: 0000000000000008 RBP: 00007fa25ca93d6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa25cc77038 R14: 00007fa25cc76fa0 R15: 00007ffec3edbc08 Modules linked in: ---[ end trace 9e5d0a140c6a8085 ]--- RIP: 0010:bpf_overflow_handler+0x288/0x370 kernel/events/core.c:9862 Code: ff 55 00 41 89 c4 42 80 3c 3b 00 74 0a 48 8b 7c 24 10 e8 6b 67 1a 00 48 8b 44 24 10 4c 8b 28 49 83 c5 20 4c 89 e8 48 c1 e8 03 <42> 80 3c 38 00 74 08 4c 89 ef e8 49 67 1a 00 bb 70 02 00 00 49 03 RSP: 0018:ffffc900012fef00 EFLAGS: 00010202 RAX: 0000000000000004 RBX: 1ffff11028e5e979 RCX: 0a15d6387ca65200 RDX: ffffc90007a19000 RSI: 0000000000000a06 RDI: 00000000ffffffff RBP: ffffc900012ff000 R08: ffff8881000554b7 R09: 1ffff1102000aa96 R10: dffffc0000000000 R11: ffffed102000aa97 R12: 0000000000000004 R13: 0000000000000020 R14: 1ffff9200025fde8 R15: dffffc0000000000 FS: 00007fa25b4586c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000647000 CR3: 000000013da71000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 ---------------- Code disassembly (best guess): 0: ff 55 00 call *0x0(%rbp) 3: 41 89 c4 mov %eax,%r12d 6: 42 80 3c 3b 00 cmpb $0x0,(%rbx,%r15,1) b: 74 0a je 0x17 d: 48 8b 7c 24 10 mov 0x10(%rsp),%rdi 12: e8 6b 67 1a 00 call 0x1a6782 17: 48 8b 44 24 10 mov 0x10(%rsp),%rax 1c: 4c 8b 28 mov (%rax),%r13 1f: 49 83 c5 20 add $0x20,%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 49 67 1a 00 call 0x1a6782 39: bb 70 02 00 00 mov $0x270,%ebx 3e: 49 rex.WB 3f: 03 .byte 0x3