==================================================================
BUG: KASAN: slab-use-after-free in tasklet_action_common+0x103/0x490 kernel/softirq.c:954
Read of size 8 at addr ffff8880585bc158 by task kworker/0:4/5628
CPU: 0 UID: 0 PID: 5628 Comm: kworker/0:4 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: events request_firmware_work_func
Call Trace:
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
tasklet_action_common+0x103/0x490 kernel/softirq.c:954
handle_softirqs+0x226/0x860 kernel/softirq.c:645
__do_softirq kernel/softirq.c:679 [inline]
invoke_softirq kernel/softirq.c:519 [inline]
__irq_exit_rcu+0xcb/0x220 kernel/softirq.c:758
irq_exit_rcu+0x9/0x30 kernel/softirq.c:775
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:220 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x29/0x50 kernel/locking/spinlock.c:229
Code: 90 f3 0f 1e fa 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 8a d7 b9 f5 48 89 df e8 42 4f ba f5 e8 dd 9c e6 f5 fb bf 01 00 00 00 92 4c ab f5 65 48 8b 05 da ef ab 07 48 85 c0 74 07 5b c3 cc cc
RSP: 0018:ffffc90004137850 EFLAGS: 00000202
RAX: 000000000006fb23 RBX: ffff8880b863b240 RCX: 8000000000000001
RDX: 0000000000000006 RSI: ffffffff8e416437 RDI: 0000000000000001
RBP: 1ffff1100f76d3eb R08: ffffffff907a647f R09: 1ffffffff20f4c8f
R10: dffffc0000000000 R11: fffffbfff20f4c90 R12: ffff88807bb69f6c
R13: dffffc0000000000 R14: ffffffff8be81730 R15: ffff88807bb69f58
sched_submit_work kernel/sched/core.c:7327 [inline]
schedule+0xea/0x2b0 kernel/sched/core.c:7375
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7433
__mutex_lock_common kernel/locking/mutex.c:726 [inline]
__mutex_lock+0x7c1/0x1550 kernel/locking/mutex.c:821
device_lock include/linux/device.h:1104 [inline]
ath9k_hif_usb_firmware_fail drivers/net/wireless/ath/ath9k/hif_usb.c:1150 [inline]
ath9k_hif_usb_firmware_cb+0x30a/0x4b0 drivers/net/wireless/ath/ath9k/hif_usb.c:1278
request_firmware_work_func+0xf7/0x2d0 drivers/base/firmware_loader/main.c:1164
process_one_work kernel/workqueue.c:3396 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
kthread+0x38b/0x480 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
Allocated by task 5628:
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:409 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:426
kasan_kmalloc include/linux/kasan.h:263 [inline]
__kmalloc_cache_noprof+0x321/0x600 mm/slub.c:5563
_kmalloc_noprof include/linux/slab.h:991 [inline]
_kzalloc_noprof include/linux/slab.h:1312 [inline]
ath9k_init_wmi+0x4f/0x2b0 drivers/net/wireless/ath/ath9k/wmi.c:95
ath9k_htc_probe_device+0x1e5/0x2370 drivers/net/wireless/ath/ath9k/htc_drv_init.c:956
ath9k_htc_hw_init+0x32/0x70 drivers/net/wireless/ath/ath9k/htc_hst.c:532
ath9k_hif_usb_firmware_cb+0x214/0x4b0 drivers/net/wireless/ath/ath9k/hif_usb.c:1255
request_firmware_work_func+0xf7/0x2d0 drivers/base/firmware_loader/main.c:1164
process_one_work kernel/workqueue.c:3396 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
kthread+0x38b/0x480 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 5628:
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:264 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:296
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2748 [inline]
slab_free mm/slub.c:6508 [inline]
kfree+0x1c5/0x650 mm/slub.c:6801
ath9k_htc_probe_device+0x11a9/0x2370 drivers/net/wireless/ath/ath9k/htc_drv_init.c:978
ath9k_htc_hw_init+0x32/0x70 drivers/net/wireless/ath/ath9k/htc_hst.c:532
ath9k_hif_usb_firmware_cb+0x214/0x4b0 drivers/net/wireless/ath/ath9k/hif_usb.c:1255
request_firmware_work_func+0xf7/0x2d0 drivers/base/firmware_loader/main.c:1164
process_one_work kernel/workqueue.c:3396 [inline]
process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
kthread+0x38b/0x480 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
The buggy address belongs to the object at ffff8880585bc000
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 344 bytes inside of
freed 2048-byte region [ffff8880585bc000, ffff8880585bc800)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x585b8
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801b042000 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b042000 dead000000000100 dead000000000122
head: 0000000000000000 0000000000080008 00000000f5000000 0000000000000000
head: 00fff00000000003 fffffffffffffe01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5633, tgid 5633 (syz-executor), ts 86964280464
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0x1f9/0x250 mm/page_alloc.c:1871
prep_new_page mm/page_alloc.c:1879 [inline]
get_page_from_freelist+0x2209/0x2280 mm/page_alloc.c:3943
__alloc_frozen_pages_noprof+0x217/0x5a0 mm/page_alloc.c:5436
alloc_slab_page mm/slub.c:3347 [inline]
allocate_slab+0x7d/0x620 mm/slub.c:3462
new_slab mm/slub.c:3513 [inline]
refill_objects+0x2d5/0x350 mm/slub.c:7417
refill_sheaf mm/slub.c:2885 [inline]
__pcs_replace_empty_main+0x2c8/0x6c0 mm/slub.c:4774
alloc_from_pcs mm/slub.c:4850 [inline]
slab_alloc_node mm/slub.c:4984 [inline]
__do_kmalloc_node mm/slub.c:5413 [inline]
__kvmalloc_node_noprof+0x63c/0x820 mm/slub.c:7014
_kvmalloc_array_node_noprof include/linux/slab.h:1374 [inline]
__ptr_ring_init_queue_alloc_noprof include/linux/ptr_ring.h:503 [inline]
ptr_ring_init_noprof include/linux/ptr_ring.h:521 [inline]
page_pool_init net/core/page_pool.c:260 [inline]
page_pool_create_percpu+0x2ef/0xc70 net/core/page_pool.c:350
nsim_create_page_pool drivers/net/netdevsim/netdev.c:430 [inline]
nsim_init_napi drivers/net/netdevsim/netdev.c:453 [inline]
nsim_open+0x3ca/0xa10 drivers/net/netdevsim/netdev.c:509
__dev_open+0x46f/0x850 net/core/dev.c:1724
__dev_change_flags+0x329/0x820 net/core/dev.c:9855
netif_change_flags+0x7c/0x1b0 net/core/dev.c:9920
do_setlink+0xdd6/0x4670 net/core/rtnetlink.c:3271
rtnl_changelink net/core/rtnetlink.c:3910 [inline]
__rtnl_newlink net/core/rtnetlink.c:4081 [inline]
rtnl_newlink+0x15a3/0x1c30 net/core/rtnetlink.c:4220
rtnetlink_rcv_msg+0x802/0xc00 net/core/rtnetlink.c:7137
netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2575
page last free pid 1 tgid 1 ts 33513937968 stack trace:
reset_page_owner include/linux/page_owner.h:26 [inline]
__free_pages_prepare mm/page_alloc.c:1418 [inline]
free_pages_prepare+0x9eb/0xaf0 mm/page_alloc.c:1463
__free_contig_range_common+0x174/0x340 mm/page_alloc.c:7072
destroy_args+0x4e5/0x570 mm/debug_vm_pgtable.c:993
debug_vm_pgtable+0x3f8/0x410 mm/debug_vm_pgtable.c:1368
do_one_initcall+0x250/0x870 init/main.c:1362
do_initcall_level+0x10a/0x1a0 init/main.c:1424
do_initcalls+0x59/0xa0 init/main.c:1440
kernel_init_freeable+0x29d/0x3e0 init/main.c:1675
kernel_init+0x22/0x1d0 init/main.c:1565
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:
ffff8880585bc000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880585bc080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880585bc100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880585bc180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880585bc200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 90 nop
1: f3 0f 1e fa endbr64
5: 53 push %rbx
6: 48 89 fb mov %rdi,%rbx
9: 48 83 c7 18 add $0x18,%rdi
d: 48 8b 74 24 08 mov 0x8(%rsp),%rsi
12: e8 8a d7 b9 f5 call 0xf5b9d7a1
17: 48 89 df mov %rbx,%rdi
1a: e8 42 4f ba f5 call 0xf5ba4f61
1f: e8 dd 9c e6 f5 call 0xf5e69d01
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 92 4c ab f5 call 0xf5ab4cc1 <-- trapping instruction
2f: 65 48 8b 05 da ef ab mov %gs:0x7abefda(%rip),%rax # 0x7abf011
36: 07
37: 48 85 c0 test %rax,%rax
3a: 74 07 je 0x43
3c: 5b pop %rbx
3d: c3 ret
3e: cc int3
3f: cc int3