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: 29881 Comm: syz.2.8323 Tainted: G W syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 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 2b 64 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 09 64 1a 00 bb 70 02 00 00 49 03 RSP: 0018:ffffc90001177400 EFLAGS: 00010202 RAX: 0000000000000004 RBX: 1ffff11024c02079 RCX: 0000000000080000 RDX: ffffc90001961000 RSI: 0000000000034f70 RDI: ffffffff864e4b0c RBP: ffffc90001177500 R08: ffffffff86e78048 R09: ffffffff86e78058 R10: ffffffff86e7805c R11: ffffffff86e78043 R12: 0000000000000000 R13: 0000000000000020 R14: 1ffff9200022ee88 R15: dffffc0000000000 FS: 00007f97c0eea6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000029117f CR3: 000000011fa4c000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000200000000300 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+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:__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:ffffc90001177a40 EFLAGS: 00050287 RAX: 000020000029117f RBX: 0000000000000000 RCX: ffff8881252d0000 RDX: 0000000000000002 RSI: 00000000000000ff RDI: 0000000000001000 RBP: ffffc90001177a90 R08: ffff8881252d0000 R09: 0000000000000002 R10: 0000000000000040 R11: 0000000000000002 R12: 000020000029117f R13: 00000000000000ff R14: 0000200000291180 R15: 00000000ffffffff generic_perform_write+0x1ab/0x540 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+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: 0033:0x7f97c248f629 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:00007f97c0eea028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f97c2708fa0 RCX: 00007f97c248f629 RDX: 0000000013bb711e RSI: 0000200000000180 RDI: 0000000000000009 RBP: 00007f97c2525b39 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f97c2709038 R14: 00007f97c2708fa0 R15: 00007ffd2159bc78 Modules linked in: ---[ end trace df92877fe11fb5a2 ]--- 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 2b 64 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 09 64 1a 00 bb 70 02 00 00 49 03 RSP: 0018:ffffc90001177400 EFLAGS: 00010202 RAX: 0000000000000004 RBX: 1ffff11024c02079 RCX: 0000000000080000 RDX: ffffc90001961000 RSI: 0000000000034f70 RDI: ffffffff864e4b0c RBP: ffffc90001177500 R08: ffffffff86e78048 R09: ffffffff86e78058 R10: ffffffff86e7805c R11: ffffffff86e78043 R12: 0000000000000000 R13: 0000000000000020 R14: 1ffff9200022ee88 R15: dffffc0000000000 FS: 00007f97c0eea6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000029117f CR3: 000000011fa4c000 CR4: 00000000003506a0 DR0: 0000000000000000 DR1: 0000200000000300 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 2b 64 1a 00 call 0x1a6442 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 09 64 1a 00 call 0x1a6442 39: bb 70 02 00 00 mov $0x270,%ebx 3e: 49 rex.WB 3f: 03 .byte 0x3