syzbot

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verifier bug: REG INVARIANTS VIOLATION (false_reg1): range bounds violation u64=[0x4000000, 0x0] s64=[0x4000000, 0x0] u32=[0x4000000, 0x0] s32=[0x4000000, 0x0] var_off=(0x0, 0x0)
WARNING: kernel/bpf/verifier.c:2748 at 0x0, CPU#1: syz.0.17/6029
Modules linked in:
CPU: 1 UID: 0 PID: 6029 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:reg_bounds_sanity_check+0x3e6/0xc30 kernel/bpf/verifier.c:2742
Code: 98 00 00 00 4c 8b 8c 24 88 00 00 00 41 ff 34 24 41 57 55 41 55 ff b4 24 f0 00 00 00 ff b4 24 a8 00 00 00 ff b4 24 c0 00 00 00 <67> 48 0f b9 3a 48 83 c4 38 49 bf 00 00 00 00 00 fc ff df 48 8b 84
RSP: 0018:ffffc900030c6ed0 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: 1ffff11005595e58 RCX: 0000000004000000
RDX: ffffffff8b71ab00 RSI: ffffffff8b723380 RDI: ffffffff8f81d370
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000004000000
R10: 00000000000000d0 R11: 0000000000000000 R12: ffff88802acaf2c0
R13: 0000000004000000 R14: 1ffff11005595e57 R15: 0000000000000000
FS:  000055557dee5500(0000) GS:ffff888125f88000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f94fffe7dac CR3: 0000000073108000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 reg_set_min_max+0x2b4/0x340 kernel/bpf/verifier.c:16517
 check_cond_jmp_op+0x19c2/0x2e20 kernel/bpf/verifier.c:-1
 do_check_insn kernel/bpf/verifier.c:20362 [inline]
 do_check+0x58e1/0xeb70 kernel/bpf/verifier.c:20502
 do_check_common+0x19a2/0x2580 kernel/bpf/verifier.c:23788
 do_check_main kernel/bpf/verifier.c:23871 [inline]
 bpf_check+0x5e6e/0x1bfc0 kernel/bpf/verifier.c:25178
 bpf_prog_load+0x13ba/0x1a10 kernel/bpf/syscall.c:3097
 __sys_bpf+0x507/0x860 kernel/bpf/syscall.c:6173
 __do_sys_bpf kernel/bpf/syscall.c:6283 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:6281 [inline]
 __x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:6281
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f94ffd8f749
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:00007ffda2f03208 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007f94fffe5fa0 RCX: 00007f94ffd8f749
RDX: 0000000000000048 RSI: 00002000000054c0 RDI: 0000000000000005
RBP: 00007f94ffe13f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f94fffe5fa0 R14: 00007f94fffe5fa0 R15: 0000000000000003
 </TASK>
----------------
Code disassembly (best guess):
   0:	98                   	cwtl
   1:	00 00                	add    %al,(%rax)
   3:	00 4c 8b 8c          	add    %cl,-0x74(%rbx,%rcx,4)
   7:	24 88                	and    $0x88,%al
   9:	00 00                	add    %al,(%rax)
   b:	00 41 ff             	add    %al,-0x1(%rcx)
   e:	34 24                	xor    $0x24,%al
  10:	41 57                	push   %r15
  12:	55                   	push   %rbp
  13:	41 55                	push   %r13
  15:	ff b4 24 f0 00 00 00 	push   0xf0(%rsp)
  1c:	ff b4 24 a8 00 00 00 	push   0xa8(%rsp)
  23:	ff b4 24 c0 00 00 00 	push   0xc0(%rsp)
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	48 83 c4 38          	add    $0x38,%rsp
  33:	49 bf 00 00 00 00 00 	movabs $0xdffffc0000000000,%r15
  3a:	fc ff df
  3d:	48                   	rex.W
  3e:	8b                   	.byte 0x8b
  3f:	84                   	.byte 0x84