==================================================================
BUG: KASAN: slab-use-after-free in sched_mm_cid_remote_clear+0x271/0x470
Write of size 8 at addr ffff888041f0a0b0 by task syz-executor.5/3941
CPU: 1 UID: 0 PID: 3941 Comm: syz-executor.5 Tainted: G W 6.17.0-rc4-next-20250901 #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
print_report+0xcb/0x610
kasan_report+0xca/0x100
kasan_check_range+0x39/0x1b0
sched_mm_cid_remote_clear+0x271/0x470
task_mm_cid_work+0x39f/0x840
task_work_run+0x172/0x280
exit_to_user_mode_loop+0xef/0x110
do_syscall_64+0x2f7/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2065110b19
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:00007f2062665108 EFLAGS: 00000202 ORIG_RAX: 00000000000001a9
RAX: 0000000000000004 RBX: 00007f2065224020 RCX: 00007f2065110b19
RDX: 0000000020ffd000 RSI: 0000000020000240 RDI: 0000000000003cfc
RBP: 0000000020000240 R08: 0000000020000300 R09: 0000000020000300
R10: 00000000200002c0 R11: 0000000000000202 R12: 0000000020000300
R13: 0000000020ffd000 R14: 00000000200002c0 R15: 0000000020ffd000
Allocated by task 114:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
__kasan_slab_alloc+0x59/0x70
kmem_cache_alloc_noprof+0x205/0x690
alloc_empty_file+0x58/0x1e0
path_openat+0xe0/0x2880
do_filp_open+0x1e8/0x450
do_sys_openat2+0x104/0x1b0
__x64_sys_openat+0x142/0x200
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 114:
kasan_save_stack+0x24/0x50
kasan_save_track+0x14/0x30
__kasan_save_free_info+0x3a/0x60
__kasan_slab_free+0x3f/0x50
slab_free_after_rcu_debug+0xd6/0x290
rcu_core+0x7c8/0x1800
handle_softirqs+0x1b1/0x770
__irq_exit_rcu+0xc4/0x100
irq_exit_rcu+0x9/0x20
sysvec_apic_timer_interrupt+0x70/0x80
asm_sysvec_apic_timer_interrupt+0x1a/0x20
Last potentially related work creation:
kasan_save_stack+0x24/0x50
kasan_record_aux_stack+0x89/0xa0
kmem_cache_free+0x148/0x540
__fput+0x67b/0xb50
fput_close_sync+0x10f/0x240
__x64_sys_close+0x8f/0x120
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888041f0a000
which belongs to the cache filp of size 360
The buggy address is located 176 bytes inside of
freed 360-byte region [ffff888041f0a000, ffff888041f0a168)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x41f0a
head: order:1 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
memcg:ffff88800b7c0e01
flags: 0x100000000000040(head|node=0|zone=1)
page_type: f5(slab)
raw: 0100000000000040 ffff888009415500 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000120012 00000000f5000000 ffff88800b7c0e01
head: 0100000000000040 ffff888009415500 dead000000000122 0000000000000000
head: 0000000000000000 0000000000120012 00000000f5000000 ffff88800b7c0e01
head: 0100000000000001 ffffea000107c281 00000000ffffffff 00000000ffffffff
head: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000002
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff888041f09f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
ffff888041f0a000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888041f0a080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888041f0a100: fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc
ffff888041f0a180: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
==================================================================
kmemleak: Found object by alias at 0x607f1a63dae8
CPU: 1 UID: 0 PID: 3937 Comm: syz-executor.3 Tainted: G B W 6.17.0-rc4-next-20250901 #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
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: 0033:0x7f91cebfcb19
Code: Unable to access opcode bytes at 0x7f91cebfcaef.
RSP: 002b:00007ffc34da8e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000000000001e RCX: 00007f91cebfcb19
RDX: 00007f91cebaf72b RSI: ffffffffffffffbc RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000001b2d1211e8 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000000000 R14: 0000000000000001 R15: 00007ffc34da8f50
kmemleak: Object (percpu) 0x607f1a63dae0 (size 16):
kmemleak: comm "syz-executor.3", pid 285, jiffies 4294772959
kmemleak: min_count = 1
kmemleak: count = 0
kmemleak: flags = 0x21
kmemleak: checksum = 0
kmemleak: backtrace:
pcpu_alloc_noprof+0x87a/0x1170
mm_init+0x99b/0x1170
copy_process+0x3ab7/0x73c0
kernel_clone+0xea/0x7f0
__do_sys_clone+0xce/0x120
do_syscall_64+0xbf/0x360
entry_SYSCALL_64_after_hwframe+0x77/0x7f