cgroup: Unknown subsys name 'net'
=========================
WARNING: held lock freed!
5.16.0-rc3-next-20211130-syzkaller #0 Not tainted
-------------------------
syz-executor/6541 is freeing memory ffff88801d286400-ffff88801d2865ff, with a lock still held there!
ffff88801d286548 (&root->kernfs_rwsem){++++}-{3:3}, at: kernfs_remove fs/kernfs/dir.c:1396 [inline]
ffff88801d286548 (&root->kernfs_rwsem){++++}-{3:3}, at: kernfs_destroy_root+0x81/0xb0 fs/kernfs/dir.c:964
2 locks held by syz-executor/6541:
#0: ffffffff8bbc50c8 (cgroup_mutex){+.+.}-{3:3}, at: cgroup_lock_and_drain_offline+0xa5/0x900 kernel/cgroup/cgroup.c:2998
#1: ffff88801d286548 (&root->kernfs_rwsem){++++}-{3:3}, at: kernfs_remove fs/kernfs/dir.c:1396 [inline]
#1: ffff88801d286548 (&root->kernfs_rwsem){++++}-{3:3}, at: kernfs_destroy_root+0x81/0xb0 fs/kernfs/dir.c:964
stack backtrace:
CPU: 1 PID: 6541 Comm: syz-executor Not tainted 5.16.0-rc3-next-20211130-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_freed_lock_bug kernel/locking/lockdep.c:6388 [inline]
debug_check_no_locks_freed.cold+0x9d/0xa9 kernel/locking/lockdep.c:6421
slab_free_hook mm/slub.c:1695 [inline]
slab_free_freelist_hook+0x73/0x1c0 mm/slub.c:1749
slab_free mm/slub.c:3513 [inline]
kfree+0xe0/0x430 mm/slub.c:4561
kernfs_put.part.0+0x331/0x540 fs/kernfs/dir.c:548
kernfs_put+0x42/0x50 fs/kernfs/dir.c:513
__kernfs_remove+0x7a3/0xb20 fs/kernfs/dir.c:1382
kernfs_remove fs/kernfs/dir.c:1397 [inline]
kernfs_destroy_root+0x89/0xb0 fs/kernfs/dir.c:964
cgroup_setup_root+0x3a6/0xad0 kernel/cgroup/cgroup.c:2077
cgroup1_root_to_use kernel/cgroup/cgroup-v1.c:1194 [inline]
cgroup1_get_tree+0xd33/0x1390 kernel/cgroup/cgroup-v1.c:1211
vfs_get_tree+0x89/0x2f0 fs/super.c:1500
do_new_mount fs/namespace.c:3004 [inline]
path_mount+0x1320/0x1fa0 fs/namespace.c:3334
do_mount fs/namespace.c:3347 [inline]
__do_sys_mount fs/namespace.c:3555 [inline]
__se_sys_mount fs/namespace.c:3532 [inline]
__x64_sys_mount+0x27f/0x300 fs/namespace.c:3532
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7efd4c34a01a
Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 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:00007fffbab820e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fffbab82278 RCX: 00007efd4c34a01a
RDX: 00007efd4c3acfe2 RSI: 00007efd4c3a329a RDI: 00007efd4c3a1d71
RBP: 00007efd4c3a329a R08: 00007efd4c3a33f7 R09: 0000000000000026
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffbab820f0
R13: 00007fffbab82298 R14: 00007fffbab821c0 R15: 00007efd4c3a33f1
==================================================================
BUG: KASAN: use-after-free in __up_write kernel/locking/rwsem.c:1318 [inline]
BUG: KASAN: use-after-free in up_write+0x3ac/0x470 kernel/locking/rwsem.c:1576
Read of size 8 at addr ffff88801d286540 by task syz-executor/6541
CPU: 0 PID: 6541 Comm: syz-executor Not tainted 5.16.0-rc3-next-20211130-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description.constprop.0.cold+0xa5/0x3ed mm/kasan/report.c:247
__kasan_report mm/kasan/report.c:433 [inline]
kasan_report.cold+0x83/0xdf mm/kasan/report.c:450
__up_write kernel/locking/rwsem.c:1318 [inline]
up_write+0x3ac/0x470 kernel/locking/rwsem.c:1576
cgroup_setup_root+0x3a6/0xad0 kernel/cgroup/cgroup.c:2077
cgroup1_root_to_use kernel/cgroup/cgroup-v1.c:1194 [inline]
cgroup1_get_tree+0xd33/0x1390 kernel/cgroup/cgroup-v1.c:1211
vfs_get_tree+0x89/0x2f0 fs/super.c:1500
do_new_mount fs/namespace.c:3004 [inline]
path_mount+0x1320/0x1fa0 fs/namespace.c:3334
do_mount fs/namespace.c:3347 [inline]
__do_sys_mount fs/namespace.c:3555 [inline]
__se_sys_mount fs/namespace.c:3532 [inline]
__x64_sys_mount+0x27f/0x300 fs/namespace.c:3532
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7efd4c34a01a
Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 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:00007fffbab820e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fffbab82278 RCX: 00007efd4c34a01a
RDX: 00007efd4c3acfe2 RSI: 00007efd4c3a329a RDI: 00007efd4c3a1d71
RBP: 00007efd4c3a329a R08: 00007efd4c3a33f7 R09: 0000000000000026
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffbab820f0
R13: 00007fffbab82298 R14: 00007fffbab821c0 R15: 00007efd4c3a33f1
Allocated by task 6541:
kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
____kasan_kmalloc mm/kasan/common.c:513 [inline]
____kasan_kmalloc mm/kasan/common.c:472 [inline]
__kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:522
kmalloc include/linux/slab.h:590 [inline]
kzalloc include/linux/slab.h:724 [inline]
kernfs_create_root+0x4c/0x410 fs/kernfs/dir.c:913
cgroup_setup_root+0x243/0xad0 kernel/cgroup/cgroup.c:2018
cgroup1_root_to_use kernel/cgroup/cgroup-v1.c:1194 [inline]
cgroup1_get_tree+0xd33/0x1390 kernel/cgroup/cgroup-v1.c:1211
vfs_get_tree+0x89/0x2f0 fs/super.c:1500
do_new_mount fs/namespace.c:3004 [inline]
path_mount+0x1320/0x1fa0 fs/namespace.c:3334
do_mount fs/namespace.c:3347 [inline]
__do_sys_mount fs/namespace.c:3555 [inline]
__se_sys_mount fs/namespace.c:3532 [inline]
__x64_sys_mount+0x27f/0x300 fs/namespace.c:3532
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
Freed by task 6541:
kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
kasan_set_track+0x21/0x30 mm/kasan/common.c:46
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
____kasan_slab_free mm/kasan/common.c:366 [inline]
____kasan_slab_free mm/kasan/common.c:328 [inline]
__kasan_slab_free+0x103/0x170 mm/kasan/common.c:374
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:1723 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1749
slab_free mm/slub.c:3513 [inline]
kfree+0xe0/0x430 mm/slub.c:4561
kernfs_put.part.0+0x331/0x540 fs/kernfs/dir.c:548
kernfs_put+0x42/0x50 fs/kernfs/dir.c:513
__kernfs_remove+0x7a3/0xb20 fs/kernfs/dir.c:1382
kernfs_remove fs/kernfs/dir.c:1397 [inline]
kernfs_destroy_root+0x89/0xb0 fs/kernfs/dir.c:964
cgroup_setup_root+0x3a6/0xad0 kernel/cgroup/cgroup.c:2077
cgroup1_root_to_use kernel/cgroup/cgroup-v1.c:1194 [inline]
cgroup1_get_tree+0xd33/0x1390 kernel/cgroup/cgroup-v1.c:1211
vfs_get_tree+0x89/0x2f0 fs/super.c:1500
do_new_mount fs/namespace.c:3004 [inline]
path_mount+0x1320/0x1fa0 fs/namespace.c:3334
do_mount fs/namespace.c:3347 [inline]
__do_sys_mount fs/namespace.c:3555 [inline]
__se_sys_mount fs/namespace.c:3532 [inline]
__x64_sys_mount+0x27f/0x300 fs/namespace.c:3532
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
Last potentially related work creation:
kasan_save_stack+0x1e/0x50 mm/kasan/common.c:38
__kasan_record_aux_stack+0xfe/0x1b0 mm/kasan/generic.c:348
__call_rcu kernel/rcu/tree.c:3026 [inline]
call_rcu+0xb1/0x740 kernel/rcu/tree.c:3106
rhashtable_rehash_table lib/rhashtable.c:345 [inline]
rht_deferred_worker+0x146d/0x2030 lib/rhashtable.c:429
process_one_work+0x9b2/0x1690 kernel/workqueue.c:2299
worker_thread+0x658/0x11f0 kernel/workqueue.c:2446
kthread+0x405/0x4f0 kernel/kthread.c:345
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
The buggy address belongs to the object at ffff88801d286400
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 320 bytes inside of
512-byte region [ffff88801d286400, ffff88801d286600)
The buggy address belongs to the page:
page:ffffea000074a100 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1d284
head:ffffea000074a100 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888010c41c80
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 2970, ts 32028923287, free_ts 21987656555
prep_new_page mm/page_alloc.c:2433 [inline]
get_page_from_freelist+0xa72/0x2f40 mm/page_alloc.c:4164
__alloc_pages+0x1b2/0x500 mm/page_alloc.c:5376
alloc_pages+0x1a7/0x300 mm/mempolicy.c:2193
alloc_slab_page mm/slub.c:1793 [inline]
allocate_slab mm/slub.c:1930 [inline]
new_slab+0x261/0x460 mm/slub.c:1993
___slab_alloc+0x798/0xf30 mm/slub.c:3022
__slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3109
slab_alloc_node mm/slub.c:3200 [inline]
__kmalloc_node_track_caller+0x2cb/0x360 mm/slub.c:4956
kmalloc_reserve net/core/skbuff.c:354 [inline]
__alloc_skb+0xde/0x340 net/core/skbuff.c:426
alloc_skb include/linux/skbuff.h:1127 [inline]
netlink_alloc_large_skb net/netlink/af_netlink.c:1187 [inline]
netlink_sendmsg+0x967/0xda0 net/netlink/af_netlink.c:1887
sock_sendmsg_nosec net/socket.c:704 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:724
____sys_sendmsg+0x6e8/0x810 net/socket.c:2409
___sys_sendmsg+0xf3/0x170 net/socket.c:2463
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2492
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1351 [inline]
free_pcp_prepare+0x414/0xb60 mm/page_alloc.c:1403
free_unref_page_prepare mm/page_alloc.c:3324 [inline]
free_unref_page+0x19/0x690 mm/page_alloc.c:3403
__unfreeze_partials+0x19f/0x1c0 mm/slub.c:2527
qlink_free mm/kasan/quarantine.c:146 [inline]
qlist_free_all+0x5a/0xf0 mm/kasan/quarantine.c:165
kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272
__kasan_slab_alloc+0xa2/0xc0 mm/kasan/common.c:444
kasan_slab_alloc include/linux/kasan.h:259 [inline]
slab_post_alloc_hook mm/slab.h:519 [inline]
slab_alloc_node mm/slub.c:3234 [inline]
slab_alloc mm/slub.c:3242 [inline]
__kmalloc+0x1e7/0x340 mm/slub.c:4419
kmalloc include/linux/slab.h:595 [inline]
tomoyo_realpath_from_path+0xc3/0x620 security/tomoyo/realpath.c:254
tomoyo_get_realpath security/tomoyo/file.c:151 [inline]
tomoyo_path_perm+0x21b/0x400 security/tomoyo/file.c:822
security_inode_getattr+0xcf/0x140 security/security.c:1334
vfs_getattr fs/stat.c:157 [inline]
vfs_fstat+0x43/0xb0 fs/stat.c:182
__do_sys_newfstat+0x81/0x100 fs/stat.c:422
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae
Memory state around the buggy address:
ffff88801d286400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801d286480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88801d286500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88801d286580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801d286600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================