general protection fault, probably for non-canonical address 0xdffffc0000000004: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000020-0x0000000000000027] CPU: 1 PID: 1933 Comm: syz.0.451 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/14/2025 RIP: 0010:bpf_overflow_handler+0x292/0x3a0 kernel/events/core.c:9862 Code: 00 74 0a 48 8b 7c 24 18 e8 5b 20 1a 00 48 8b 44 24 18 4c 8b 28 49 83 c5 20 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ef e8 30 20 1a 00 bb 70 02 00 00 49 03 5d RSP: 0018:ffffc90000f57400 EFLAGS: 00010202 RAX: 0000000000000004 RBX: 1ffff110221f6f79 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90000f57500 R08: ffffffff86c75048 R09: ffffffff86c75058 R10: ffffffff86c7505c R11: ffffffff86c75043 R12: 000000006a6fdeb3 R13: 0000000000000020 R14: ffff888110fb7800 R15: 1ffff920001eae88 FS: 00007f398aeae6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000001e0000 CR3: 000000011a9f3000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 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+0x377/0x470 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+0xc6a/0xc80 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:__get_user_nocheck_1+0x6/0x10 arch/x86/lib/getuser.S:124 Code: d0 73 64 48 19 d2 48 21 d0 0f 01 cb 48 8b 10 31 c0 0f 01 ca c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 01 cb 0f ae e8 <0f> b6 10 31 c0 0f 01 ca c3 90 0f 01 cb 0f ae e8 0f b7 10 31 c0 0f RSP: 0018:ffffc90000f57a40 EFLAGS: 00050293 RAX: 00002000001e0000 RBX: 00000000001e0000 RCX: ffff88810c0da780 RDX: 0000000000000000 RSI: 0000000000001000 RDI: 0000000000000000 RBP: ffffc90000f57a90 R08: ffff88810c0da780 R09: 0000000000000002 R10: 0000000000000040 R11: 0000000000000000 R12: 00002000001e0fff R13: 00002000001e1000 R14: 00002000001e0000 R15: 00000000ffffffff generic_perform_write+0x1a2/0x510 mm/filemap.c:3499 __generic_file_write_iter+0x24b/0x480 mm/filemap.c:3638 generic_file_write_iter+0xa9/0x1d0 mm/filemap.c:3670 call_write_iter include/linux/fs.h:2066 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0x725/0xd60 fs/read_write.c:605 ksys_write+0x140/0x240 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: 0033:0x7f398b03dbe9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f398aeae038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f398b264fa0 RCX: 00007f398b03dbe9 RDX: 00000000002a979d RSI: 0000200000000000 RDI: 0000000000000007 RBP: 00007f398b0c0e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f398b265038 R14: 00007f398b264fa0 R15: 00007ffc4ae9a608 Modules linked in: ---[ end trace 424c5b59b3d30ac7 ]--- RIP: 0010:bpf_overflow_handler+0x292/0x3a0 kernel/events/core.c:9862 Code: 00 74 0a 48 8b 7c 24 18 e8 5b 20 1a 00 48 8b 44 24 18 4c 8b 28 49 83 c5 20 4c 89 e8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 ef e8 30 20 1a 00 bb 70 02 00 00 49 03 5d RSP: 0018:ffffc90000f57400 EFLAGS: 00010202 RAX: 0000000000000004 RBX: 1ffff110221f6f79 RCX: dffffc0000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90000f57500 R08: ffffffff86c75048 R09: ffffffff86c75058 R10: ffffffff86c7505c R11: ffffffff86c75043 R12: 000000006a6fdeb3 R13: 0000000000000020 R14: ffff888110fb7800 R15: 1ffff920001eae88 FS: 00007f398aeae6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000001e0000 CR3: 000000011a9f3000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 00 74 0a 48 add %dh,0x48(%rdx,%rcx,1) 4: 8b 7c 24 18 mov 0x18(%rsp),%edi 8: e8 5b 20 1a 00 call 0x1a2068 d: 48 8b 44 24 18 mov 0x18(%rsp),%rax 12: 4c 8b 28 mov (%rax),%r13 15: 49 83 c5 20 add $0x20,%r13 19: 4c 89 e8 mov %r13,%rax 1c: 48 c1 e8 03 shr $0x3,%rax 20: 48 b9 00 00 00 00 00 movabs $0xdffffc0000000000,%rcx 27: fc ff df * 2a: 80 3c 08 00 cmpb $0x0,(%rax,%rcx,1) <-- trapping instruction 2e: 74 08 je 0x38 30: 4c 89 ef mov %r13,%rdi 33: e8 30 20 1a 00 call 0x1a2068 38: bb 70 02 00 00 mov $0x270,%ebx 3d: 49 rex.WB 3e: 03 .byte 0x3 3f: 5d pop %rbp