Oops: general protection fault, probably for non-canonical address 0xdffffc000000002e: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000170-0x0000000000000177] CPU: 0 UID: 0 PID: 4580 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+0x28a/0x5a0 Code: 02 00 00 4c 8b 65 28 4d 85 e4 74 43 e8 4f 47 30 00 49 8d bc 24 78 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 f7 02 00 00 49 8b 9c 24 78 01 00 00 bf 08 00 00 RSP: 0018:ffff88804a797dc8 EFLAGS: 00010217 RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffc90004608000 RDX: 000000000000002e RSI: ffffffff81447b61 RDI: 0000000000000174 RBP: ffff88800974fbc8 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8664ca57 R11: 0000000000000001 R12: fffffffffffffffc R13: ffff88800fc3161c R14: ffffffff85cfbf20 R15: ffff88801750bff8 FS: 00007fbee6460700(0000) GS:ffff8880e5397000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0fe561d547 CR3: 000000001f544000 CR4: 0000000000350ef0 Call Trace: create_new_namespaces+0x585/0x750 unshare_nsproxy_namespaces+0xc0/0x200 ksys_unshare+0x468/0xa10 __x64_sys_unshare+0x31/0x40 do_syscall_64+0xbf/0x430 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fbee8f2cb19 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:00007fbee6460188 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 00007fbee90400e0 RCX: 00007fbee8f2cb19 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000004a000080 RBP: 00007fbee8f86f6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe05f09d2f R14: 00007fbee6460300 R15: 0000000000022000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:nsproxy_free+0x28a/0x5a0 Code: 02 00 00 4c 8b 65 28 4d 85 e4 74 43 e8 4f 47 30 00 49 8d bc 24 78 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 f7 02 00 00 49 8b 9c 24 78 01 00 00 bf 08 00 00 RSP: 0018:ffff88804a797dc8 EFLAGS: 00010217 RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffc90004608000 RDX: 000000000000002e RSI: ffffffff81447b61 RDI: 0000000000000174 RBP: ffff88800974fbc8 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff8664ca57 R11: 0000000000000001 R12: fffffffffffffffc R13: ffff88800fc3161c R14: ffffffff85cfbf20 R15: ffff88801750bff8 FS: 00007fbee6460700(0000) GS:ffff8880e5397000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0fe561d547 CR3: 000000001f544000 CR4: 0000000000350ef0 Bluetooth: hci3: ACL packet for unknown connection handle 200 Bluetooth: hci3: ACL packet for unknown connection handle 200 Bluetooth: hci3: unexpected event for opcode 0x0411 Bluetooth: hci3: ACL packet for unknown connection handle 485 Bluetooth: hci3: ACL packet for unknown connection handle 200 Bluetooth: hci3: ACL packet for unknown connection handle 200 Bluetooth: hci3: unexpected event for opcode 0x0411 Bluetooth: hci3: ACL packet for unknown connection handle 485 program syz-executor.4 is using a deprecated SCSI ioctl, please convert it to SG_IO Bluetooth: hci3: Controller not accepting commands anymore: ncmd = 0 Bluetooth: hci3: Injecting HCI hardware error event Bluetooth: hci3: hardware error 0x00 Bluetooth: hci3: Opcode 0x0c03 failed: -110 loop5: detected capacity change from 0 to 1024 program syz-executor.4 is using a deprecated SCSI ioctl, please convert it to SG_IO EXT4-fs error (device loop5): ext4_quota_enable:7137: inode #3: comm syz-executor.5: iget: special inode unallocated EXT4-fs error (device loop5): ext4_quota_enable:7139: comm syz-executor.5: Bad quota inode: 3, type: 0 EXT4-fs warning (device loop5): ext4_enable_quotas:7177: Failed to enable quota tracking (type=0, err=-117, ino=3). Please run e2fsck to fix. EXT4-fs (loop5): mount failed loop5: detected capacity change from 0 to 1024 EXT4-fs error (device loop5): ext4_quota_enable:7137: inode #3: comm syz-executor.5: iget: special inode unallocated EXT4-fs error (device loop5): ext4_quota_enable:7139: comm syz-executor.5: Bad quota inode: 3, type: 0 EXT4-fs warning (device loop5): ext4_enable_quotas:7177: Failed to enable quota tracking (type=0, err=-117, ino=3). Please run e2fsck to fix. EXT4-fs (loop5): mount failed ---------------- Code disassembly (best guess): 0: 02 00 add (%rax),%al 2: 00 4c 8b 65 add %cl,0x65(%rbx,%rcx,4) 6: 28 4d 85 sub %cl,-0x7b(%rbp) 9: e4 74 in $0x74,%al b: 43 e8 4f 47 30 00 rex.XB callq 0x304760 11: 49 8d bc 24 78 01 00 lea 0x178(%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 f7 02 00 00 jne 0x32b 34: 49 8b 9c 24 78 01 00 mov 0x178(%r12),%rbx 3b: 00 3c: bf .byte 0xbf 3d: 08 00 or %al,(%rax)