loop4: detected capacity change from 0 to 4 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000017: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x00000000000000b8-0x00000000000000bf] CPU: 1 UID: 0 PID: 4271 Comm: syz-executor.2 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:put_pid_ns+0x30/0x80 Code: 89 fd 53 e8 42 a0 03 00 48 85 ed 74 3d e8 38 a0 03 00 48 8d bd d0 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 35 48 8b 9d d0 00 00 00 bf 08 00 00 00 48 89 de e8 RSP: 0018:ffff88800727fdb0 EFLAGS: 00010216 RAX: dffffc0000000000 RBX: 0000000000000004 RCX: ffffc9000289e000 RDX: 0000000000000017 RSI: ffffffff81712278 RDI: 00000000000000ba RBP: ffffffffffffffea R08: 0000000000000001 R09: ffffed1000e4ffa3 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88801a84c2d8 R13: ffff88801a84c48c R14: ffffffff85cfbf20 R15: ffff88801bdf0878 FS: 00007f5dc1898700(0000) GS:ffff8880e5497000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f260f121940 CR3: 000000001ec40000 CR4: 0000000000350ef0 Call Trace: nsproxy_free+0xfa/0x5a0 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: 0033:0x7f5dc4322b19 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 EXT4-fs (loop4): bad geometry: block count 512 exceeds size of device (2 blocks) RSP: 002b:00007f5dc1898188 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 00007f5dc4435f60 RCX: 00007f5dc4322b19 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000080 RBP: 00007f5dc437cf6d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc427df8df R14: 00007f5dc1898300 R15: 0000000000022000 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:put_pid_ns+0x30/0x80 Code: 89 fd 53 e8 42 a0 03 00 48 85 ed 74 3d e8 38 a0 03 00 48 8d bd d0 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 35 48 8b 9d d0 00 00 00 bf 08 00 00 00 48 89 de e8 RSP: 0018:ffff88800727fdb0 EFLAGS: 00010216 RAX: dffffc0000000000 RBX: 0000000000000004 RCX: ffffc9000289e000 RDX: 0000000000000017 RSI: ffffffff81712278 RDI: 00000000000000ba RBP: ffffffffffffffea R08: 0000000000000001 R09: ffffed1000e4ffa3 R10: 0000000000000000 R11: 0000000000000001 R12: ffff88801a84c2d8 R13: ffff88801a84c48c R14: ffffffff85cfbf20 R15: ffff88801bdf0878 FS: 00007f5dc1898700(0000) GS:ffff8880e5497000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f260f121940 CR3: 000000001ec40000 CR4: 0000000000350ef0 loop4: detected capacity change from 0 to 4 EXT4-fs (loop4): bad geometry: block count 512 exceeds size of device (2 blocks) loop4: detected capacity change from 0 to 4 EXT4-fs (loop4): bad geometry: block count 512 exceeds size of device (2 blocks) loop2: detected capacity change from 0 to 136 isofs_fill_super: bread failed, dev=loop2, iso_blknum=34, block=68 EXT4-fs warning (device sda): ext4_group_extend:1862: can't shrink FS - resize aborted loop2: detected capacity change from 0 to 136 isofs_fill_super: bread failed, dev=loop2, iso_blknum=34, block=68 EXT4-fs warning (device sda): ext4_group_extend:1862: can't shrink FS - resize aborted EXT4-fs warning (device sda): ext4_group_extend:1862: can't shrink FS - resize aborted EXT4-fs warning (device sda): ext4_group_extend:1862: can't shrink FS - resize aborted EXT4-fs warning (device sda): ext4_group_extend:1862: can't shrink FS - resize aborted EXT4-fs warning (device sda): ext4_group_extend:1862: can't shrink FS - resize aborted EXT4-fs warning (device sda): ext4_group_extend:1862: can't shrink FS - resize aborted FAT-fs (loop3): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) FAT-fs (loop6): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) EXT4-fs warning (device sda): ext4_group_extend:1862: can't shrink FS - resize aborted EXT4-fs warning (device sda): ext4_group_extend:1862: can't shrink FS - resize aborted EXT4-fs warning (device sda): ext4_group_extend:1862: can't shrink FS - resize aborted EXT4-fs warning (device sda): ext4_group_extend:1862: can't shrink FS - resize aborted FAT-fs (loop2): unable to read boot sector EXT4-fs warning (device sda): ext4_group_extend:1862: can't shrink FS - resize aborted EXT4-fs warning (device sda): ext4_group_extend:1862: can't shrink FS - resize aborted EXT4-fs warning (device sda): ext4_group_extend:1862: can't shrink FS - resize aborted EXT4-fs warning (device sda): ext4_group_extend:1862: can't shrink FS - resize aborted EXT4-fs warning (device sda): ext4_group_extend:1862: can't shrink FS - resize aborted EXT4-fs warning (device sda): ext4_group_extend:1862: can't shrink FS - resize aborted ---------------- Code disassembly (best guess): 0: 89 fd mov %edi,%ebp 2: 53 push %rbx 3: e8 42 a0 03 00 callq 0x3a04a 8: 48 85 ed test %rbp,%rbp b: 74 3d je 0x4a d: e8 38 a0 03 00 callq 0x3a04a 12: 48 8d bd d0 00 00 00 lea 0xd0(%rbp),%rdi 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: 75 35 jne 0x65 30: 48 8b 9d d0 00 00 00 mov 0xd0(%rbp),%rbx 37: bf 08 00 00 00 mov $0x8,%edi 3c: 48 89 de mov %rbx,%rsi 3f: e8 .byte 0xe8