cgroup: Unknown subsys name 'net'
=========================
WARNING: held lock freed!
5.16.0-rc3-next-20211201-syzkaller #0 Not tainted
-------------------------
syz-executor/6534 is freeing memory ffff88814728ac00-ffff88814728adff, with a lock still held there!
ffff88814728ad48 (&root->kernfs_rwsem){++++}-{3:3}, at: kernfs_remove fs/kernfs/dir.c:1396 [inline]
ffff88814728ad48 (&root->kernfs_rwsem){++++}-{3:3}, at: kernfs_destroy_root+0x81/0xb0 fs/kernfs/dir.c:964
2 locks held by syz-executor/6534:
#0: ffffffff8bbc4e48 (cgroup_mutex){+.+.}-{3:3}, at: cgroup_lock_and_drain_offline+0xa5/0x900 kernel/cgroup/cgroup.c:2998
#1: ffff88814728ad48 (&root->kernfs_rwsem){++++}-{3:3}, at: kernfs_remove fs/kernfs/dir.c:1396 [inline]
#1: ffff88814728ad48 (&root->kernfs_rwsem){++++}-{3:3}, at: kernfs_destroy_root+0x81/0xb0 fs/kernfs/dir.c:964
stack backtrace:
CPU: 0 PID: 6534 Comm: syz-executor Not tainted 5.16.0-rc3-next-20211201-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: 0033:0x7fbea0d6901a
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:00007ffffe022b08 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffffe022c98 RCX: 00007fbea0d6901a
RDX: 00007fbea0dcbfe2 RSI: 00007fbea0dc229a RDI: 00007fbea0dc0d71
RBP: 00007fbea0dc229a R08: 00007fbea0dc23f7 R09: 0000000000000026
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffffe022b10
R13: 00007ffffe022cb8 R14: 00007ffffe022be0 R15: 00007fbea0dc23f1
==================================================================
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 ffff88814728ad40 by task syz-executor/6534
CPU: 1 PID: 6534 Comm: syz-executor Not tainted 5.16.0-rc3-next-20211201-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: 0033:0x7fbea0d6901a
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:00007ffffe022b08 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffffe022c98 RCX: 00007fbea0d6901a
RDX: 00007fbea0dcbfe2 RSI: 00007fbea0dc229a RDI: 00007fbea0dc0d71
RBP: 00007fbea0dc229a R08: 00007fbea0dc23f7 R09: 0000000000000026
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffffe022b10
R13: 00007ffffe022cb8 R14: 00007ffffe022be0 R15: 00007fbea0dc23f1
Allocated by task 6534:
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 6534:
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
percpu_ref_put_many.constprop.0+0x22b/0x260 include/linux/percpu-refcount.h:335
rcu_do_batch kernel/rcu/tree.c:2527 [inline]
rcu_core+0x7b8/0x1520 kernel/rcu/tree.c:2778
__do_softirq+0x29b/0x9c2 kernel/softirq.c:558
The buggy address belongs to the object at ffff88814728ac00
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 320 bytes inside of
512-byte region [ffff88814728ac00, ffff88814728ae00)
The buggy address belongs to the page:
page:ffffea00051ca200 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x147288
head:ffffea00051ca200 order:2 compound_mapcount:0 compound_pincount:0
flags: 0x57ff00000010200(slab|head|node=1|zone=2|lastcpupid=0x7ff)
raw: 057ff00000010200 dead000000000100 dead000000000122 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 1, ts 8955105137, free_ts 8946689868
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_page_interleave+0x1e/0x200 mm/mempolicy.c:2037
alloc_pages+0x29f/0x300 mm/mempolicy.c:2188
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]
slab_alloc mm/slub.c:3242 [inline]
kmem_cache_alloc_trace+0x289/0x2c0 mm/slub.c:3259
kmalloc include/linux/slab.h:590 [inline]
kzalloc include/linux/slab.h:724 [inline]
device_private_init drivers/base/core.c:3238 [inline]
device_add+0x11a7/0x1ee0 drivers/base/core.c:3288
device_create_groups_vargs+0x203/0x280 drivers/base/core.c:4051
device_create+0xdf/0x120 drivers/base/core.c:4093
ppp_init+0x13c/0x177 drivers/net/ppp/ppp_generic.c:1404
do_one_initcall+0x103/0x650 init/main.c:1303
do_initcall_level init/main.c:1378 [inline]
do_initcalls init/main.c:1394 [inline]
do_basic_setup init/main.c:1413 [inline]
kernel_init_freeable+0x6b1/0x73a init/main.c:1618
kernel_init+0x1a/0x1d0 init/main.c:1507
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
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
__stack_depot_save+0x16d/0x4f0 lib/stackdepot.c:414
kasan_save_stack+0x38/0x50 mm/kasan/common.c:40
kasan_set_track mm/kasan/common.c:46 [inline]
set_alloc_info mm/kasan/common.c:434 [inline]
__kasan_slab_alloc+0x90/0xc0 mm/kasan/common.c:467
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]
kmem_cache_alloc+0x202/0x3a0 mm/slub.c:3247
kmem_cache_zalloc include/linux/slab.h:714 [inline]
__kernfs_new_node+0xd4/0x8b0 fs/kernfs/dir.c:585
kernfs_new_node+0x93/0x120 fs/kernfs/dir.c:647
__kernfs_create_file+0x51/0x350 fs/kernfs/file.c:987
sysfs_add_file_mode_ns+0x20f/0x3f0 fs/sysfs/file.c:294
create_files fs/sysfs/group.c:64 [inline]
internal_create_group+0x322/0xb10 fs/sysfs/group.c:148
internal_create_groups.part.0+0x90/0x140 fs/sysfs/group.c:188
internal_create_groups fs/sysfs/group.c:184 [inline]
sysfs_create_groups+0x25/0x50 fs/sysfs/group.c:214
bus_add_driver+0x34e/0x630 drivers/base/bus.c:629
driver_register+0x220/0x3a0 drivers/base/driver.c:171
mlx4_init+0x223/0x262 drivers/net/ethernet/mellanox/mlx4/main.c:4498
Memory state around the buggy address:
ffff88814728ac00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88814728ac80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88814728ad00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88814728ad80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88814728ae00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================