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verifier bug: error during ctx access conversion(1)
WARNING: kernel/bpf/verifier.c:21405 at convert_ctx_accesses kernel/bpf/verifier.c:21405 [inline], CPU#0: syz.5.3936/20984
WARNING: kernel/bpf/verifier.c:21405 at bpf_check+0x1b6ec/0x1d2e0 kernel/bpf/verifier.c:24690, CPU#0: syz.5.3936/20984
Modules linked in:
CPU: 0 UID: 0 PID: 20984 Comm: syz.5.3936 Not tainted 6.16.0-rc5-next-20250711-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:convert_ctx_accesses kernel/bpf/verifier.c:21405 [inline]
RIP: 0010:bpf_check+0x1b6ec/0x1d2e0 kernel/bpf/verifier.c:24690
Code: 8b e8 68 6f af ff 90 0f 0b 90 90 e9 6b 60 ff ff e8 a9 a6 eb ff c6 05 a3 8b b9 0d 01 90 48 c7 c7 40 01 92 8b e8 45 6f af ff 90 <0f> 0b 90 90 e9 b5 bd ff ff e8 86 a6 eb ff c6 05 85 8b b9 0d 01 90
RSP: 0018:ffffc9000b91f600 EFLAGS: 00010246
RAX: e84506bda2c44400 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9001241f000 RSI: 0000000000004c21 RDI: 0000000000004c22
RBP: ffffc9000b91fb50 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bfa4d8 R12: ffffc9000574d05a
R13: dffffc0000000000 R14: ffff88807c7e0000 R15: 0000000000000004
FS:  00007f4b4b83b6c0(0000) GS:ffff888125bc6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c3520e1 CR3: 0000000048f9a000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 00000000000032e7 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 bpf_prog_load+0x1318/0x1930 kernel/bpf/syscall.c:2972
 __sys_bpf+0x528/0x870 kernel/bpf/syscall.c:5996
 __do_sys_bpf kernel/bpf/syscall.c:6106 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6104 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6104
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4b4a98e929
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:00007f4b4b83b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f4b4abb6080 RCX: 00007f4b4a98e929
RDX: 0000000000000080 RSI: 0000200000000180 RDI: 0000000000000005
RBP: 00007f4b4aa10b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f4b4abb6080 R15: 00007ffdf490fe58
 </TASK>