general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037] CPU: 0 PID: 10026 Comm: syz.4.12110 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:bpf_overflow_handler+0x115/0x370 kernel/events/core.c:9862 Code: 00 00 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 4d 65 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 2c 65 1a 00 4c 89 e7 48 89 de 41 RSP: 0018:ffffc90001177280 EFLAGS: 00010206 RAX: 0000000000000006 RBX: 0000000000000038 RCX: 0000000000080000 RDX: ffffc9000b2d9000 RSI: 0000000000030256 RDI: 0000000000030257 RBP: ffffc90001177380 R08: ffff888125cd0b4b R09: 1ffff11024b9a169 R10: dffffc0000000000 R11: ffffed1024b9a16a R12: ffffc900011772e0 R13: 0000000000000030 R14: 1ffff9200022ee58 R15: dffffc0000000000 FS: 00007f1d9e03f6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000056f000 CR3: 0000000125a3f000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000200000000300 DR3: 0000200000000300 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+0xc76/0xc90 arch/x86/mm/fault.c:1255 handle_page_fault arch/x86/mm/fault.c:1428 [inline] exc_page_fault+0x5a/0xc0 arch/x86/mm/fault.c:1484 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:ffffc900011778b0 EFLAGS: 00050206 RAX: ffffffff823cf701 RBX: 0000000000008000 RCX: 0000000000007a40 RDX: 0000000000008000 RSI: 000020000056f000 RDI: ffff8881175e85c0 RBP: ffffc90001177940 R08: ffff8881175effff R09: 1ffff11022ebdfff R10: dffffc0000000000 R11: ffffed1022ebe000 R12: 0000000000008000 R13: dffffc00000000ff R14: 000020000056ea40 R15: ffff8881175e8000 skb_copy_datagram_from_iter+0x2d0/0x6b0 net/core/datagram.c:579 unix_stream_sendmsg+0x73d/0xbe0 net/unix/af_unix.c:1941 sock_sendmsg_nosec net/socket.c:652 [inline] __sock_sendmsg net/socket.c:664 [inline] sock_write_iter+0x2a6/0x3a0 net/socket.c:1018 call_write_iter include/linux/fs.h:2066 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x758/0xdc0 fs/read_write.c:605 ksys_write+0x149/0x250 fs/read_write.c:658 __do_sys_write fs/read_write.c:670 [inline] __se_sys_write fs/read_write.c:667 [inline] __x64_sys_write+0x7b/0x90 fs/read_write.c:667 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x61/0xcb RIP: 0033:0x7f1d9f5e4819 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:00007f1d9e03f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f1d9f85dfa0 RCX: 00007f1d9f5e4819 RDX: 00000000fffffeff RSI: 00002000000005c0 RDI: 0000000000000003 RBP: 00007f1d9f67ac91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f1d9f85e038 R14: 00007f1d9f85dfa0 R15: 00007ffdf350fcf8 Modules linked in: ---[ end trace af85f3f8ac2381fc ]--- RIP: 0010:bpf_overflow_handler+0x115/0x370 kernel/events/core.c:9862 Code: 00 00 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 4d 65 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 2c 65 1a 00 4c 89 e7 48 89 de 41 RSP: 0018:ffffc90001177280 EFLAGS: 00010206 RAX: 0000000000000006 RBX: 0000000000000038 RCX: 0000000000080000 RDX: ffffc9000b2d9000 RSI: 0000000000030256 RDI: 0000000000030257 RBP: ffffc90001177380 R08: ffff888125cd0b4b R09: 1ffff11024b9a169 R10: dffffc0000000000 R11: ffffed1024b9a16a R12: ffffc900011772e0 R13: 0000000000000030 R14: 1ffff9200022ee58 R15: dffffc0000000000 FS: 00007f1d9e03f6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000056f000 CR3: 0000000125a3f000 CR4: 00000000003506b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000200000000300 DR3: 0000200000000300 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 4d 65 1a 00 call 0x1a6565 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 2c 65 1a 00 call 0x1a6565 39: 4c 89 e7 mov %r12,%rdi 3c: 48 89 de mov %rbx,%rsi 3f: 41 rex.B