EXT4-fs (loop0): bad geometry: block count 256 exceeds size of device (2 blocks)
EXT4-fs (loop2): unmounting filesystem 00000000-0000-0000-0000-000000000000.
==================================================================
BUG: KASAN: slab-use-after-free in nsproxy_free+0x572/0x5a0
Read of size 8 at addr ffff88800f7388b0 by task syz-executor.3/3985
CPU: 0 UID: 0 PID: 3985 Comm: syz-executor.3 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
Call Trace:
dump_stack_lvl+0xca/0x120
print_report+0xcb/0x610
kasan_report+0xca/0x100
nsproxy_free+0x572/0x5a0
create_new_namespaces+0x585/0x750
copy_namespaces+0x45c/0x580
copy_process+0x26e4/0x72a0
kernel_clone+0xea/0x7f0
__do_sys_clone3+0x1f5/0x280
do_syscall_64+0xbf/0x430
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2dba7dbb19
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:00007f2db7d30188 EFLAGS: 00000246 ORIG_RAX: 00000000000001b3
RAX: ffffffffffffffda RBX: 00007f2dba8ef020 RCX: 00007f2dba7dbb19
RDX: 0000000000000000 RSI: 0000000000000058 RDI: 0000000020005880
RBP: 00007f2dba835f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffeb296341f R14: 00007f2db7d30300 R15: 0000000000022000
Allocated by task 3963:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
__kasan_slab_alloc+0x59/0x70
kmem_cache_alloc_noprof+0x213/0x690
create_new_namespaces+0x30/0x750
__do_sys_setns+0x20b/0x1a90
do_syscall_64+0xbf/0x430
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 3963:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
kasan_save_free_info+0x3a/0x60
__kasan_slab_free+0x43/0x70
kmem_cache_free+0x2a4/0x550
switch_task_namespaces+0x102/0x120
__do_sys_setns+0x6b0/0x1a90
do_syscall_64+0xbf/0x430
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88800f738888
which belongs to the cache nsproxy of size 72
The buggy address is located 40 bytes inside of
freed 72-byte region [ffff88800f738888, ffff88800f7388d0)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88800f7383a8 pfn:0xf738
memcg:ffff88801ac98001
flags: 0x100000000000000(node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000000 ffff88800944cdc0 dead000000000122 0000000000000000
raw: ffff88800f7383a8 000000008027001e 00000000f5000000 ffff88801ac98001
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff88800f738780: 00 00 00 fc fc fc fc 00 00 00 00 00 00 00 00 00
ffff88800f738800: fc fc fc fc 00 00 00 00 00 00 00 00 00 fc fc fc
>ffff88800f738880: fc fa fb fb fb fb fb fb fb fb fc fc fc fc fa fb
^
ffff88800f738900: fb fb fb fb fb fb fb fc fc fc fc fa fb fb fb fb
ffff88800f738980: fb fb fb fb fc fc fc fc 00 00 00 00 00 00 00 00
==================================================================
------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: lib/refcount.c:28 at refcount_warn_saturate+0x10d/0x210, CPU#0: syz-executor.3/3985
Modules linked in:
CPU: 0 UID: 0 PID: 3985 Comm: syz-executor.3 Tainted: G B 6.18.0-rc5-next-20251112 #1 PREEMPT(voluntary)
Tainted: [B]=BAD_PAGE
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:refcount_warn_saturate+0x10d/0x210
Code: c6 0c 04 31 ff 89 de e8 91 84 1f ff 84 db 75 9f e8 b8 89 1f ff c6 05 fe c5 0c 04 01 90 48 c7 c7 80 07 03 85 e8 b4 b5 e4 fe 90 <0f> 0b 90 90 e9 7c ff ff ff e8 95 89 1f ff 0f b6 1d d9 c5 0c 04 31
RSP: 0018:ffff888017b879e0 EFLAGS: 00010282
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffc900068be000
RDX: 0000000000040000 RSI: ffffffff8139f03e RDI: 0000000000000001
RBP: ffff88800f7388ac R08: 0000000000000001 R09: ffffed1002f70ef3
R10: 0000000000000001 R11: 0000000000000001 R12: ffff88800f738880
R13: ffff88800f7388ac R14: ffff88801ee1c820 R15: ffff88801cf0a438
FS: 00007f2db7d30700(0000) GS:ffff8880e5397000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005594dc7b1940 CR3: 000000000dbec000 CR4: 0000000000350ef0
Call Trace:
nsproxy_free+0x4ea/0x5a0
create_new_namespaces+0x585/0x750
copy_namespaces+0x45c/0x580
copy_process+0x26e4/0x72a0
kernel_clone+0xea/0x7f0
__do_sys_clone3+0x1f5/0x280
do_syscall_64+0xbf/0x430
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2dba7dbb19
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:00007f2db7d30188 EFLAGS: 00000246 ORIG_RAX: 00000000000001b3
RAX: ffffffffffffffda RBX: 00007f2dba8ef020 RCX: 00007f2dba7dbb19
RDX: 0000000000000000 RSI: 0000000000000058 RDI: 0000000020005880
RBP: 00007f2dba835f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffeb296341f R14: 00007f2db7d30300 R15: 0000000000022000
irq event stamp: 12151
hardirqs last enabled at (12151): [] irqentry_exit+0x17b/0x650
hardirqs last disabled at (12150): [] handle_softirqs+0x633/0x770
softirqs last enabled at (11854): [] netlink_release+0xfbc/0x1fa0
softirqs last disabled at (11852): [] netlink_release+0xf19/0x1fa0
---[ end trace 0000000000000000 ]---
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: 3985 Comm: syz-executor.3 Tainted: G B W 6.18.0-rc5-next-20251112 #1 PREEMPT(voluntary)
Tainted: [B]=BAD_PAGE, [W]=WARN
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:ffff888017b879f8 EFLAGS: 00010217
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffc900068be000
RDX: 000000000000002e RSI: ffffffff81447b61 RDI: 0000000000000174
RBP: ffff88800f738a28 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff8664ca57 R11: ffff88801ceeced0 R12: fffffffffffffffc
R13: ffff88801426141c R14: ffff88801ee1c820 R15: ffff88801cf0a438
FS: 00007f2db7d30700(0000) GS:ffff8880e5397000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005594dc7b1940 CR3: 000000000dbec000 CR4: 0000000000350ef0
Call Trace:
create_new_namespaces+0x585/0x750
copy_namespaces+0x45c/0x580
copy_process+0x26e4/0x72a0
kernel_clone+0xea/0x7f0
__do_sys_clone3+0x1f5/0x280
do_syscall_64+0xbf/0x430
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2dba7dbb19
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:00007f2db7d30188 EFLAGS: 00000246 ORIG_RAX: 00000000000001b3
RAX: ffffffffffffffda RBX: 00007f2dba8ef020 RCX: 00007f2dba7dbb19
RDX: 0000000000000000 RSI: 0000000000000058 RDI: 0000000020005880
RBP: 00007f2dba835f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffeb296341f R14: 00007f2db7d30300 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:ffff888017b879f8 EFLAGS: 00010217
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: ffffc900068be000
RDX: 000000000000002e RSI: ffffffff81447b61 RDI: 0000000000000174
RBP: ffff88800f738a28 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff8664ca57 R11: ffff88801ceeced0 R12: fffffffffffffffc
R13: ffff88801426141c R14: ffff88801ee1c820 R15: ffff88801cf0a438
FS: 00007f2db7d30700(0000) GS:ffff8880e5397000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005594dc7b1940 CR3: 000000000dbec000 CR4: 0000000000350ef0
Bluetooth: hci1: Opcode 0x0401 failed: -4
Bluetooth: hci1: Opcode 0x0401 failed: -4
Bluetooth: hci1: command 0x0401 tx timeout
Bluetooth: hci1: command 0x0401 tx timeout
program syz-executor.2 is using a deprecated SCSI ioctl, please convert it to SG_IO
loop3: detected capacity change from 0 to 264192
block device autoloading is deprecated and will be removed.
program syz-executor.2 is using a deprecated SCSI ioctl, please convert it to SG_IO
Bluetooth: hci1: Opcode 0x0401 failed: -4
----------------
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)