[syzbot] [kernfs?] KASAN: slab-use-after-free Read in __kernfs_new_node
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9:11 AM (6 hours ago) 9:11 AM
to drive...@lists.linux.dev, gre...@linuxfoundation.org, linux-...@vger.kernel.org, syzkall...@googlegroups.com, t...@kernel.org
Hello,
syzbot found the following issue on:
HEAD commit: c425609d6ac4 Add linux-next specific files for 20260612
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=171a0bd2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=d7a56b1e89b63439
dashboard link: https://syzkaller.appspot.com/bug?extid=3942dc5563ea8b96bbbe
compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/7fab9a8df61a/disk-c425609d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c2577196651b/vmlinux-c425609d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/053557a7471e/bzImage-c425609d.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3942dc...@syzkaller.appspotmail.com
=========================================[ 553.259716][ T10] ==================================================================
BUG: KASAN: slab-use-after-free in instrument_atomic_read include/linux/instrumented.h:82 [inline]
BUG: KASAN: slab-use-after-free in atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
BUG: KASAN: slab-use-after-free in kernfs_get fs/kernfs/dir.c:560 [inline]
BUG: KASAN: slab-use-after-free in __kernfs_new_node+0x563/0xa70 fs/kernfs/dir.c:704
Read of size 4 at addr ffff88802991b4b0 by task kworker/0:1/10
CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Tainted: G L syzkaller #0 PREEMPT_{RT,(full)}
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: events request_firmware_work_func
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_address_description+0x55/0x1e0 mm/kasan/report.c:378
print_report+0x58/0x70 mm/kasan/report.c:482
kasan_report+0x117/0x150 mm/kasan/report.c:595
check_region_inline mm/kasan/generic.c:-1 [inline]
kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200
instrument_atomic_read include/linux/instrumented.h:82 [inline]
atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
kernfs_get fs/kernfs/dir.c:560 [inline]
__kernfs_new_node+0x563/0xa70 fs/kernfs/dir.c:704
kernfs_new_node fs/kernfs/dir.c:751 [inline]
kernfs_create_dir_ns+0xfe/0x230 fs/kernfs/dir.c:1120
sysfs_create_dir_ns+0x12f/0x2a0 fs/sysfs/dir.c:59
create_dir lib/kobject.c:73 [inline]
kobject_add_internal+0x62c/0xce0 lib/kobject.c:240
kobject_add_varg lib/kobject.c:374 [inline]
kobject_add+0x163/0x240 lib/kobject.c:426
class_dir_create_and_add drivers/base/core.c:3300 [inline]
get_device_parent+0x31d/0x3a0 drivers/base/core.c:3351
device_add+0x2d4/0xb80 drivers/base/core.c:3681
fw_load_sysfs_fallback drivers/base/firmware_loader/fallback.c:86 [inline]
fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:162 [inline]
firmware_fallback_sysfs+0x2dd/0xa40 drivers/base/firmware_loader/fallback.c:238
_request_firmware+0x1049/0x1780 drivers/base/firmware_loader/main.c:898
request_firmware_work_func+0xac/0x2d0 drivers/base/firmware_loader/main.c:1162
process_one_work+0x93a/0x12b0 kernel/workqueue.c:3326
process_scheduled_works kernel/workqueue.c:3409 [inline]
worker_thread+0xb05/0x10d0 kernel/workqueue.c:3490
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Allocated by task 5753:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:340 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4610 [inline]
slab_alloc_node mm/slub.c:4943 [inline]
kmem_cache_alloc_noprof+0x348/0x6b0 mm/slub.c:4957
__kernfs_new_node+0xe7/0xa70 fs/kernfs/dir.c:665
kernfs_new_node fs/kernfs/dir.c:751 [inline]
kernfs_create_dir_ns+0xfe/0x230 fs/kernfs/dir.c:1120
sysfs_create_dir_ns+0x12f/0x2a0 fs/sysfs/dir.c:59
create_dir lib/kobject.c:73 [inline]
kobject_add_internal+0x62c/0xce0 lib/kobject.c:240
kobject_add_varg lib/kobject.c:374 [inline]
kobject_add+0x163/0x240 lib/kobject.c:426
device_add+0x3fa/0xb80 drivers/base/core.c:3695
usb_new_device+0x98d/0x1610 drivers/usb/core/hub.c:2695
hub_port_connect drivers/usb/core/hub.c:5567 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
port_event drivers/usb/core/hub.c:5871 [inline]
hub_event+0x28cf/0x4cf0 drivers/usb/core/hub.c:5953
process_one_work+0x93a/0x12b0 kernel/workqueue.c:3326
process_scheduled_works kernel/workqueue.c:3409 [inline]
worker_thread+0xb05/0x10d0 kernel/workqueue.c:3490
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Freed by task 29:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2703 [inline]
slab_free mm/slub.c:6402 [inline]
kmem_cache_free+0x187/0x6c0 mm/slub.c:6529
rcu_do_batch kernel/rcu/tree.c:2645 [inline]
rcu_core kernel/rcu/tree.c:2897 [inline]
rcu_cpu_kthread+0x950/0x1480 kernel/rcu/tree.c:2985
smpboot_thread_fn+0x57c/0xa80 kernel/smpboot.c:160
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
__call_rcu_common kernel/rcu/tree.c:3159 [inline]
call_rcu+0xee/0x8b0 kernel/rcu/tree.c:3279
kernfs_put+0x625/0x820 fs/kernfs/dir.c:618
evict+0x624/0xb50 fs/inode.c:825
dentry_kill+0x1b9/0x880 fs/dcache.c:826
finish_dput+0x1a/0x260 fs/dcache.c:1001
lookup_fast+0x3d0/0x5d0 fs/namei.c:1886
walk_component fs/namei.c:2278 [inline]
link_path_walk+0x71f/0x1910 fs/namei.c:2656
path_openat+0x23c/0x3850 fs/namei.c:4855
do_file_open+0x23e/0x4a0 fs/namei.c:4888
do_sys_openat2+0x115/0x200 fs/open.c:1368
do_sys_open fs/open.c:1374 [inline]
__do_sys_openat fs/open.c:1390 [inline]
__se_sys_openat fs/open.c:1385 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1385
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88802991b4b0
which belongs to the cache kernfs_node_cache of size 176
The buggy address is located 0 bytes inside of
freed 176-byte region [ffff88802991b4b0, ffff88802991b560)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2991b
flags: 0x80000000000000(node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000000 ffff88801be88b40 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800110011 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 9436, tgid 9436 (syz-executor), ts 355931337322, free_ts 355813181360
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859
prep_new_page mm/page_alloc.c:1867 [inline]
get_page_from_freelist+0x2639/0x26b0 mm/page_alloc.c:3946
__alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304
alloc_slab_page mm/slub.c:3292 [inline]
allocate_slab+0x79/0x5e0 mm/slub.c:3406
new_slab mm/slub.c:3452 [inline]
refill_objects+0x2d8/0x350 mm/slub.c:7335
refill_sheaf mm/slub.c:2830 [inline]
__pcs_replace_empty_main+0x330/0x690 mm/slub.c:4701
alloc_from_pcs mm/slub.c:4799 [inline]
slab_alloc_node mm/slub.c:4931 [inline]
kmem_cache_alloc_noprof+0x465/0x6b0 mm/slub.c:4957
__kernfs_new_node+0xe7/0xa70 fs/kernfs/dir.c:665
kernfs_new_node+0xea/0x140 fs/kernfs/dir.c:751
__kernfs_create_file+0x4b/0x2e0 fs/kernfs/file.c:1050
sysfs_add_file_mode_ns+0x237/0x300 fs/sysfs/file.c:316
create_files fs/sysfs/group.c:82 [inline]
internal_create_group+0x679/0x1180 fs/sysfs/group.c:189
internal_create_groups fs/sysfs/group.c:229 [inline]
sysfs_create_groups+0x59/0x120 fs/sysfs/group.c:255
netdev_queue_add_kobject net/core/net-sysfs.c:1982 [inline]
netdev_queue_update_kobjects+0x2a4/0x6b0 net/core/net-sysfs.c:2035
register_queue_kobjects net/core/net-sysfs.c:2098 [inline]
netdev_register_kobject+0x258/0x310 net/core/net-sysfs.c:2341
register_netdevice+0x1455/0x1ed0 net/core/dev.c:11437
page last free pid 21 tgid 21 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1406 [inline]
__free_frozen_pages+0x10de/0x11c0 mm/page_alloc.c:2950
__tlb_remove_table_free mm/mmu_gather.c:228 [inline]
tlb_remove_table_rcu+0x85/0x100 mm/mmu_gather.c:291
rcu_do_batch kernel/rcu/tree.c:2645 [inline]
rcu_core kernel/rcu/tree.c:2897 [inline]
rcu_cpu_kthread+0x950/0x1480 kernel/rcu/tree.c:2985
smpboot_thread_fn+0x57c/0xa80 kernel/smpboot.c:160
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Memory state around the buggy address:
ffff88802991b380: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
ffff88802991b400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
>ffff88802991b480: fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb
^
ffff88802991b500: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
ffff88802991b580: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
---
This report is generated by a bot. It may contain errors.
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If you want to undo deduplication, reply with:
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syzbot found the following issue on:
HEAD commit: c425609d6ac4 Add linux-next specific files for 20260612
git tree: linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=171a0bd2580000
kernel config: https://syzkaller.appspot.com/x/.config?x=d7a56b1e89b63439
dashboard link: https://syzkaller.appspot.com/bug?extid=3942dc5563ea8b96bbbe
compiler: Debian clang version 22.1.6 (++20260514074242+fc4aad7b5db3-1~exp1~20260514074407.73), Debian LLD 22.1.6
Unfortunately, I don't have any reproducer for this issue yet.
Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/7fab9a8df61a/disk-c425609d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c2577196651b/vmlinux-c425609d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/053557a7471e/bzImage-c425609d.xz
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+3942dc...@syzkaller.appspotmail.com
=========================================[ 553.259716][ T10] ==================================================================
BUG: KASAN: slab-use-after-free in instrument_atomic_read include/linux/instrumented.h:82 [inline]
BUG: KASAN: slab-use-after-free in atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
BUG: KASAN: slab-use-after-free in kernfs_get fs/kernfs/dir.c:560 [inline]
BUG: KASAN: slab-use-after-free in __kernfs_new_node+0x563/0xa70 fs/kernfs/dir.c:704
Read of size 4 at addr ffff88802991b4b0 by task kworker/0:1/10
CPU: 0 UID: 0 PID: 10 Comm: kworker/0:1 Tainted: G L syzkaller #0 PREEMPT_{RT,(full)}
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Workqueue: events request_firmware_work_func
Call Trace:
<TASK>
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
print_address_description+0x55/0x1e0 mm/kasan/report.c:378
print_report+0x58/0x70 mm/kasan/report.c:482
kasan_report+0x117/0x150 mm/kasan/report.c:595
check_region_inline mm/kasan/generic.c:-1 [inline]
kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200
instrument_atomic_read include/linux/instrumented.h:82 [inline]
atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
kernfs_get fs/kernfs/dir.c:560 [inline]
__kernfs_new_node+0x563/0xa70 fs/kernfs/dir.c:704
kernfs_new_node fs/kernfs/dir.c:751 [inline]
kernfs_create_dir_ns+0xfe/0x230 fs/kernfs/dir.c:1120
sysfs_create_dir_ns+0x12f/0x2a0 fs/sysfs/dir.c:59
create_dir lib/kobject.c:73 [inline]
kobject_add_internal+0x62c/0xce0 lib/kobject.c:240
kobject_add_varg lib/kobject.c:374 [inline]
kobject_add+0x163/0x240 lib/kobject.c:426
class_dir_create_and_add drivers/base/core.c:3300 [inline]
get_device_parent+0x31d/0x3a0 drivers/base/core.c:3351
device_add+0x2d4/0xb80 drivers/base/core.c:3681
fw_load_sysfs_fallback drivers/base/firmware_loader/fallback.c:86 [inline]
fw_load_from_user_helper drivers/base/firmware_loader/fallback.c:162 [inline]
firmware_fallback_sysfs+0x2dd/0xa40 drivers/base/firmware_loader/fallback.c:238
_request_firmware+0x1049/0x1780 drivers/base/firmware_loader/main.c:898
request_firmware_work_func+0xac/0x2d0 drivers/base/firmware_loader/main.c:1162
process_one_work+0x93a/0x12b0 kernel/workqueue.c:3326
process_scheduled_works kernel/workqueue.c:3409 [inline]
worker_thread+0xb05/0x10d0 kernel/workqueue.c:3490
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
</TASK>
Allocated by task 5753:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
unpoison_slab_object mm/kasan/common.c:340 [inline]
__kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4610 [inline]
slab_alloc_node mm/slub.c:4943 [inline]
kmem_cache_alloc_noprof+0x348/0x6b0 mm/slub.c:4957
__kernfs_new_node+0xe7/0xa70 fs/kernfs/dir.c:665
kernfs_new_node fs/kernfs/dir.c:751 [inline]
kernfs_create_dir_ns+0xfe/0x230 fs/kernfs/dir.c:1120
sysfs_create_dir_ns+0x12f/0x2a0 fs/sysfs/dir.c:59
create_dir lib/kobject.c:73 [inline]
kobject_add_internal+0x62c/0xce0 lib/kobject.c:240
kobject_add_varg lib/kobject.c:374 [inline]
kobject_add+0x163/0x240 lib/kobject.c:426
device_add+0x3fa/0xb80 drivers/base/core.c:3695
usb_new_device+0x98d/0x1610 drivers/usb/core/hub.c:2695
hub_port_connect drivers/usb/core/hub.c:5567 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5707 [inline]
port_event drivers/usb/core/hub.c:5871 [inline]
hub_event+0x28cf/0x4cf0 drivers/usb/core/hub.c:5953
process_one_work+0x93a/0x12b0 kernel/workqueue.c:3326
process_scheduled_works kernel/workqueue.c:3409 [inline]
worker_thread+0xb05/0x10d0 kernel/workqueue.c:3490
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Freed by task 29:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2703 [inline]
slab_free mm/slub.c:6402 [inline]
kmem_cache_free+0x187/0x6c0 mm/slub.c:6529
rcu_do_batch kernel/rcu/tree.c:2645 [inline]
rcu_core kernel/rcu/tree.c:2897 [inline]
rcu_cpu_kthread+0x950/0x1480 kernel/rcu/tree.c:2985
smpboot_thread_fn+0x57c/0xa80 kernel/smpboot.c:160
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57
kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556
__call_rcu_common kernel/rcu/tree.c:3159 [inline]
call_rcu+0xee/0x8b0 kernel/rcu/tree.c:3279
kernfs_put+0x625/0x820 fs/kernfs/dir.c:618
evict+0x624/0xb50 fs/inode.c:825
dentry_kill+0x1b9/0x880 fs/dcache.c:826
finish_dput+0x1a/0x260 fs/dcache.c:1001
lookup_fast+0x3d0/0x5d0 fs/namei.c:1886
walk_component fs/namei.c:2278 [inline]
link_path_walk+0x71f/0x1910 fs/namei.c:2656
path_openat+0x23c/0x3850 fs/namei.c:4855
do_file_open+0x23e/0x4a0 fs/namei.c:4888
do_sys_openat2+0x115/0x200 fs/open.c:1368
do_sys_open fs/open.c:1374 [inline]
__do_sys_openat fs/open.c:1390 [inline]
__se_sys_openat fs/open.c:1385 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1385
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88802991b4b0
which belongs to the cache kernfs_node_cache of size 176
The buggy address is located 0 bytes inside of
freed 176-byte region [ffff88802991b4b0, ffff88802991b560)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2991b
flags: 0x80000000000000(node=0|zone=1)
page_type: f5(slab)
raw: 0080000000000000 ffff88801be88b40 dead000000000100 dead000000000122
raw: 0000000000000000 0000000800110011 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0xd2cc0(GFP_KERNEL|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 9436, tgid 9436 (syz-executor), ts 355931337322, free_ts 355813181360
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1859
prep_new_page mm/page_alloc.c:1867 [inline]
get_page_from_freelist+0x2639/0x26b0 mm/page_alloc.c:3946
__alloc_frozen_pages_noprof+0x18d/0x380 mm/page_alloc.c:5304
alloc_slab_page mm/slub.c:3292 [inline]
allocate_slab+0x79/0x5e0 mm/slub.c:3406
new_slab mm/slub.c:3452 [inline]
refill_objects+0x2d8/0x350 mm/slub.c:7335
refill_sheaf mm/slub.c:2830 [inline]
__pcs_replace_empty_main+0x330/0x690 mm/slub.c:4701
alloc_from_pcs mm/slub.c:4799 [inline]
slab_alloc_node mm/slub.c:4931 [inline]
kmem_cache_alloc_noprof+0x465/0x6b0 mm/slub.c:4957
__kernfs_new_node+0xe7/0xa70 fs/kernfs/dir.c:665
kernfs_new_node+0xea/0x140 fs/kernfs/dir.c:751
__kernfs_create_file+0x4b/0x2e0 fs/kernfs/file.c:1050
sysfs_add_file_mode_ns+0x237/0x300 fs/sysfs/file.c:316
create_files fs/sysfs/group.c:82 [inline]
internal_create_group+0x679/0x1180 fs/sysfs/group.c:189
internal_create_groups fs/sysfs/group.c:229 [inline]
sysfs_create_groups+0x59/0x120 fs/sysfs/group.c:255
netdev_queue_add_kobject net/core/net-sysfs.c:1982 [inline]
netdev_queue_update_kobjects+0x2a4/0x6b0 net/core/net-sysfs.c:2035
register_queue_kobjects net/core/net-sysfs.c:2098 [inline]
netdev_register_kobject+0x258/0x310 net/core/net-sysfs.c:2341
register_netdevice+0x1455/0x1ed0 net/core/dev.c:11437
page last free pid 21 tgid 21 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1406 [inline]
__free_frozen_pages+0x10de/0x11c0 mm/page_alloc.c:2950
__tlb_remove_table_free mm/mmu_gather.c:228 [inline]
tlb_remove_table_rcu+0x85/0x100 mm/mmu_gather.c:291
rcu_do_batch kernel/rcu/tree.c:2645 [inline]
rcu_core kernel/rcu/tree.c:2897 [inline]
rcu_cpu_kthread+0x950/0x1480 kernel/rcu/tree.c:2985
smpboot_thread_fn+0x57c/0xa80 kernel/smpboot.c:160
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Memory state around the buggy address:
ffff88802991b380: fc fc fc fc fc fc fc fc fa fb fb fb fb fb fb fb
ffff88802991b400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fc fc
>ffff88802991b480: fc fc fc fc fc fc fa fb fb fb fb fb fb fb fb fb
^
ffff88802991b500: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
ffff88802991b580: fc fc fc fc 00 00 00 00 00 00 00 00 00 00 00 00
==================================================================
---
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