------------[ cut here ]------------
WARNING: fs/namespace.c:1434 at mntput_no_expire+0x78e/0xbe0, CPU#1: syz-executor.7/33022
Modules linked in:
CPU: 1 UID: 0 PID: 33022 Comm: syz-executor.7 Tainted: G W 6.17.0-rc3-next-20250829 #1 PREEMPT(voluntary)
Tainted: [W]=WARN
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
RIP: 0010:mntput_no_expire+0x78e/0xbe0
Code: 05 16 42 81 04 01 e8 31 f8 91 ff e9 41 fc ff ff e8 b7 50 b4 ff 31 ff 44 89 ee e8 dd 4b b4 ff 45 85 ed 79 09 e8 a3 50 b4 ff 90 <0f> 0b 90 e8 9a 50 b4 ff e8 75 f6 fb 02 31 ff 89 c5 89 c6 e8 ba 4b
RSP: 0018:ffff88801b8c79b8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: 1ffff11003718f3c RCX: ffffffff81bf96d3
RDX: ffff88804727d280 RSI: ffffffff81bf96dd RDI: 0000000000000005
RBP: ffff88800d137180 R08: 0000000000000001 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000001 R12: ffff88801b8c7a20
R13: 00000000ffffffff R14: dead000000000100 R15: ffff88800d137180
FS: 0000000000000000(0000) GS:ffff8880e56dd000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2dbefcf3a4 CR3: 0000000044c51000 CR4: 0000000000350ef0
Call Trace:
namespace_unlock+0x7f1/0x810
put_mnt_ns+0xf5/0x120
free_nsproxy+0x3a/0x400
switch_task_namespaces+0xe2/0x100
do_exit+0x841/0x2970
do_group_exit+0xd3/0x2a0
get_signal+0x2315/0x2340
arch_do_signal_or_restart+0x80/0x790
irqentry_exit_to_user_mode+0x106/0x1c0
exc_page_fault+0xd9/0x180
asm_exc_page_fault+0x26/0x30
RIP: 0033:0x0
Code: Unable to access opcode bytes at 0xffffffffffffffd6.
RSP: 002b:000000002000021c EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f33c2f33f60 RCX: 00007f33c2e20b19
RDX: 0000000000000000 RSI: 0000000000000058 RDI: 0000000020000240
RBP: 00007f33c2e7af6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffbfd586cf R14: 00007f33c0396300 R15: 0000000000022000
irq event stamp: 751
hardirqs last enabled at (761): [] __up_console_sem+0x78/0x80
hardirqs last disabled at (770): [] __up_console_sem+0x5d/0x80
softirqs last enabled at (458): [] handle_softirqs+0x50c/0x770
softirqs last disabled at (451): [] __irq_exit_rcu+0xc4/0x100
---[ end trace 0000000000000000 ]---
EXT4-fs (loop0): unmounting filesystem 00000000-0000-0000-0000-000000000000.
loop0: detected capacity change from 0 to 1
FAT-fs (loop0): Directory bread(block 3) failed
FAT-fs (loop0): Directory bread(block 4) failed
FAT-fs (loop0): Directory bread(block 5) failed
FAT-fs (loop0): Directory bread(block 6) failed
FAT-fs (loop0): Directory bread(block 7) failed
FAT-fs (loop0): Directory bread(block 8) failed
FAT-fs (loop0): Directory bread(block 9) failed
FAT-fs (loop0): Directory bread(block 3) failed
FAT-fs (loop0): Directory bread(block 4) failed
FAT-fs (loop0): Directory bread(block 5) failed
loop0: detected capacity change from 0 to 1
FAT-fs (loop0): Directory bread(block 3) failed
FAT-fs (loop0): Directory bread(block 4) failed
FAT-fs (loop0): Directory bread(block 5) failed
FAT-fs (loop0): Directory bread(block 6) failed
FAT-fs (loop0): Directory bread(block 7) failed
FAT-fs (loop0): Directory bread(block 8) failed
FAT-fs (loop0): Directory bread(block 9) failed
FAT-fs (loop0): Directory bread(block 3) failed
FAT-fs (loop0): Directory bread(block 4) failed
FAT-fs (loop0): Directory bread(block 5) failed
loop0: detected capacity change from 0 to 1
FAT-fs (loop0): Directory bread(block 3) failed
FAT-fs (loop0): Directory bread(block 4) failed
FAT-fs (loop0): Directory bread(block 5) failed
FAT-fs (loop0): Directory bread(block 6) failed
FAT-fs (loop0): Directory bread(block 7) failed
FAT-fs (loop0): Directory bread(block 8) failed
FAT-fs (loop0): Directory bread(block 9) failed
FAT-fs (loop0): Directory bread(block 3) failed
FAT-fs (loop0): Directory bread(block 4) failed
FAT-fs (loop0): Directory bread(block 5) failed
kmemleak: Found object by alias at 0x607f1a639c48
CPU: 0 UID: 0 PID: 4245 Comm: syz-executor.7 Tainted: G W 6.17.0-rc3-next-20250829 #1 PREEMPT(voluntary)
Tainted: [W]=WARN
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-1 04/01/2014
Call Trace:
dump_stack_lvl+0xca/0x120
__lookup_object+0x94/0xb0
delete_object_full+0x27/0x70
free_percpu+0x30/0x1160
futex_hash_free+0x38/0xc0
mmput+0x2d3/0x390
do_exit+0x79d/0x2970
do_group_exit+0xd3/0x2a0
__x64_sys_exit_group+0x3e/0x50
x64_sys_call+0x18c5/0x18d0
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f33c2e20b19
Code: Unable to access opcode bytes at 0x7f33c2e20aef.
RSP: 002b:00007fffbfd588f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000000000001e RCX: 00007f33c2e20b19
RDX: 00007f33c2dd372b RSI: ffffffffffffffbc RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000001b2d225530 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 00007fffbfd589e0
kmemleak: Object (percpu) 0x607f1a639c44 (size 8):
kmemleak: comm "syz-executor.0", pid 4250, jiffies 4294855255
kmemleak: min_count = 1
kmemleak: count = 0
kmemleak: flags = 0x21
kmemleak: checksum = 0
kmemleak: backtrace:
pcpu_alloc_noprof+0x87a/0x1170
alloc_vfsmnt+0x135/0x6e0
vfs_create_mount.part.0+0x40/0x440
path_mount+0x1637/0x1dd0
__x64_sys_mount+0x27b/0x300
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f