syzbot

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: 2127 Comm: syz.3.587 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
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 9d 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 7c 65 1a 00 4c 89 e7 48 89 de 41
RSP: 0018:ffffc90000de7400 EFLAGS: 00010206
RAX: 0000000000000006 RBX: 0000000000000038 RCX: ffff88812d7b8000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000de7500 R08: ffff88810b396b4b R09: 1ffff11021672d69
R10: dffffc0000000000 R11: ffffed1021672d6a R12: ffffc90000de7460
R13: 0000000000000030 R14: 1ffff920001bce88 R15: dffffc0000000000
FS:  00007f1c06bdb6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000028517f CR3: 00000001121f3000 CR4: 00000000003506b0
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+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:ffffc90000de7a40 EFLAGS: 00050287
RAX: 000020000028517f RBX: 0000000000000000 RCX: ffff88812d7b8000
RDX: 0000000000000000 RSI: 00000000000000ff RDI: 0000000000001000
RBP: ffffc90000de7a90 R08: ffff88812d7b8000 R09: 0000000000000002
R10: 0000000000000040 R11: 0000000000000000 R12: 000020000028517f
R13: 00000000000000ff R14: 0000200000285180 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: 0033:0x7f1c06d77f79
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:00007f1c06bdb028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f1c06ff1fa0 RCX: 00007f1c06d77f79
RDX: 0000000013bb711e RSI: 0000200000000180 RDI: 0000000000000005
RBP: 00007f1c06e0e7e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1c06ff2038 R14: 00007f1c06ff1fa0 R15: 00007ffc7b9399a8
Modules linked in:
---[ end trace c1b7b8883fa9a840 ]---
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 9d 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 7c 65 1a 00 4c 89 e7 48 89 de 41
RSP: 0018:ffffc90000de7400 EFLAGS: 00010206
RAX: 0000000000000006 RBX: 0000000000000038 RCX: ffff88812d7b8000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000de7500 R08: ffff88810b396b4b R09: 1ffff11021672d69
R10: dffffc0000000000 R11: ffffed1021672d6a R12: ffffc90000de7460
R13: 0000000000000030 R14: 1ffff920001bce88 R15: dffffc0000000000
FS:  00007f1c06bdb6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000028517f CR3: 00000001121f3000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
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 9d 65 1a 00       	call   0x1a65b5
  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 7c 65 1a 00       	call   0x1a65b5
  39:	4c 89 e7             	mov    %r12,%rdi
  3c:	48 89 de             	mov    %rbx,%rsi
  3f:	41                   	rex.B