RBP: 00007f44f179b1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007ffdf3de685f R14: 00007f44f179b300 R15: 0000000000022000 sr 1:0:0:0: [sr0] tag#0 unaligned transfer Oops: general protection fault, probably for non-canonical address 0xdffffc0000000035: 0000 [#1] SMP KASAN NOPTI I/O error, dev sr0, sector 1 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2 KASAN: null-ptr-deref in range [0x00000000000001a8-0x00000000000001af] Buffer I/O error on dev sr0, logical block 1, async page read CPU: 0 UID: 0 PID: 5613 Comm: syz-executor.5 Not tainted 6.18.0-rc5-next-20251112 #1 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014 RIP: 0010:nsproxy_free+0x7c/0x5a0 Code: 04 00 00 4c 8b 65 08 4d 85 e4 74 47 e8 5d 49 30 00 49 8d bc 24 b8 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 fb 04 00 00 49 8b 9c 24 b8 01 00 00 bf 08 00 00 RSP: 0018:ffff88804f96f9f8 EFLAGS: 00010217 RAX: dffffc0000000000 RBX: ffff888017e01bc0 RCX: ffffc900039da000 RDX: 0000000000000035 RSI: ffffffff81447953 RDI: 00000000000001ac RBP: ffff88800d620bc8 R08: 0000000000000001 R09: ffffed1003242703 R10: 0000000000000005 R11: 0000000000000001 R12: fffffffffffffff4 R13: 0000000105005100 R14: ffffffff85cfbf20 R15: ffff888017e02438 FS: 00007f44f179b700(0000) GS:ffff8880e5397000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055555eae1c18 CR3: 000000001cbe6000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 sr 1:0:0:0: [sr0] tag#0 unaligned transfer Call Trace: create_new_namespaces+0x585/0x750 copy_namespaces+0x45c/0x580 I/O error, dev sr0, sector 2 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2 copy_process+0x26e4/0x72a0 Buffer I/O error on dev sr0, logical block 2, async page read kernel_clone+0xea/0x7f0 __do_sys_clone3+0x1f5/0x280 sr 1:0:0:0: [sr0] tag#0 unaligned transfer I/O error, dev sr0, sector 3 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2 do_syscall_64+0xbf/0x430 Buffer I/O error on dev sr0, logical block 3, async page read entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f44f4225b19 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f44f179b188 EFLAGS: 00000246 ORIG_RAX: 00000000000001b3 RAX: ffffffffffffffda RBX: 00007f44f4338f60 RCX: 00007f44f4225b19 RDX: 0000000000000000 RSI: 0000000000000058 RDI: 0000000020000400 RBP: 00007f44f179b1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000002 R13: 00007ffdf3de685f R14: 00007f44f179b300 R15: 0000000000022000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:nsproxy_free+0x7c/0x5a0 sr 1:0:0:0: [sr0] tag#0 unaligned transfer Code: 04 00 00 4c 8b 65 08 4d 85 e4 74 47 e8 5d 49 30 00 49 8d bc 24 b8 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 fb 04 00 00 49 8b 9c 24 b8 01 00 00 bf 08 00 00 I/O error, dev sr0, sector 4 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2 RSP: 0018:ffff88804f96f9f8 EFLAGS: 00010217 Buffer I/O error on dev sr0, logical block 4, async page read RAX: dffffc0000000000 RBX: ffff888017e01bc0 RCX: ffffc900039da000 RDX: 0000000000000035 RSI: ffffffff81447953 RDI: 00000000000001ac RBP: ffff88800d620bc8 R08: 0000000000000001 R09: ffffed1003242703 R10: 0000000000000005 R11: 0000000000000001 R12: fffffffffffffff4 R13: 0000000105005100 R14: ffffffff85cfbf20 R15: ffff888017e02438 FS: 00007f44f179b700(0000) GS:ffff8880e5397000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055555eae1c18 CR3: 000000001cbe6000 CR4: 0000000000350ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 sr 1:0:0:0: [sr0] tag#0 unaligned transfer I/O error, dev sr0, sector 5 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2 Buffer I/O error on dev sr0, logical block 5, async page read sr 1:0:0:0: [sr0] tag#0 unaligned transfer I/O error, dev sr0, sector 6 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2 Buffer I/O error on dev sr0, logical block 6, async page read sr 1:0:0:0: [sr0] tag#0 unaligned transfer I/O error, dev sr0, sector 7 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2 Buffer I/O error on dev sr0, logical block 7, async page read sr 1:0:0:0: [sr0] tag#0 unaligned transfer I/O error, dev sr0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2 Buffer I/O error on dev sr0, logical block 0, async page read sr 1:0:0:0: [sr0] tag#0 unaligned transfer I/O error, dev sr0, sector 1 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 2 Buffer I/O error on dev sr0, logical block 1, async page read sr 1:0:0:0: [sr0] tag#0 unaligned transfer sr 1:0:0:0: [sr0] tag#0 unaligned transfer sr 1:0:0:0: [sr0] tag#0 unaligned transfer sr 1:0:0:0: [sr0] tag#0 unaligned transfer sr 1:0:0:0: [sr0] tag#0 unaligned transfer sr 1:0:0:0: [sr0] tag#0 unaligned transfer sr 1:0:0:0: [sr0] tag#0 unaligned transfer sr 1:0:0:0: [sr0] tag#0 unaligned transfer sr 1:0:0:0: [sr0] tag#0 unaligned transfer sr 1:0:0:0: [sr0] tag#0 unaligned transfer sr 1:0:0:0: [sr0] tag#0 unaligned transfer sr 1:0:0:0: [sr0] tag#0 unaligned transfer sr 1:0:0:0: [sr0] tag#0 unaligned transfer sr 1:0:0:0: [sr0] tag#0 unaligned transfer ---------------- Code disassembly (best guess): 0: 04 00 add $0x0,%al 2: 00 4c 8b 65 add %cl,0x65(%rbx,%rcx,4) 6: 08 4d 85 or %cl,-0x7b(%rbp) 9: e4 74 in $0x74,%al b: 47 e8 5d 49 30 00 rex.RXB callq 0x30496e 11: 49 8d bc 24 b8 01 00 lea 0x1b8(%r12),%rdi 18: 00 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 23: 48 89 fa mov %rdi,%rdx 26: 48 c1 ea 03 shr $0x3,%rdx * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2e: 0f 85 fb 04 00 00 jne 0x52f 34: 49 8b 9c 24 b8 01 00 mov 0x1b8(%r12),%rbx 3b: 00 3c: bf .byte 0xbf 3d: 08 00 or %al,(%rax)