==================================================================
BUG: KASAN: slab-use-after-free in tasklet_action_common+0x103/0x490 kernel/softirq.c:954
Read of size 8 at addr ffff8880482e1158 by task kworker/1:4/5672
CPU: 1 UID: 0 PID: 5672 Comm: kworker/1:4 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:orc_find arch/x86/kernel/unwind_orc.c:229 [inline]
RIP: 0010:unwind_next_frame+0x205/0x2550 arch/x86/kernel/unwind_orc.c:510
Code: 6c 04 00 00 44 89 f8 4c 8d 2c 85 98 aa c2 91 4c 89 e8 48 c1 e8 03 42 0f b6 04 20 84 c0 4c 89 e3 0f 85 66 1d 00 00 45 8b 6d 00 <44> 89 f8 ff c0 4c 8d 24 85 98 aa c2 91 4c 89 e0 48 c1 e8 03 0f b6
RSP: 0018:ffffc9000428f300 EFLAGS: 00000246
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 8000000000000000
RDX: 00000000000aeada RSI: ffffffff8c6dad60 RDI: ffffffff8c6dad20
RBP: ffffffff8b509f88 R08: ffffffff817811df R09: 0000000000000000
R10: ffffc9000428f3f8 R11: ffffffff81b2c390 R12: dffffc0000000000
R13: 00000000001c9f84 R14: ffffc9000428f3a8 R15: 00000000000a509f
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
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
bucket_table_free lib/rhashtable.c:116 [inline]
rhashtable_free_and_destroy+0x3b3/0x410 lib/rhashtable.c:1328
rhltable_free_and_destroy include/linux/rhashtable.h:1330 [inline]
rhltable_destroy include/linux/rhashtable.h:1335 [inline]
sta_info_stop+0x29/0x40 net/mac80211/sta_info.c:1702
ieee80211_free_hw+0x54/0x3d0 net/mac80211/main.c:1769
ath9k_htc_probe_device+0x232/0x2370 drivers/net/wireless/ath/ath9k/htc_drv_init.c:980
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
Allocated by task 5672:
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 5672:
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 ffff8880482e1000
which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 344 bytes inside of
freed 2048-byte region [ffff8880482e1000, ffff8880482e1800)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x482e0
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 6266, tgid 6265 (syz.2.184), ts 104478512531
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]
__kmalloc_cache_noprof+0x39b/0x600 mm/slub.c:5559
_kmalloc_noprof include/linux/slab.h:991 [inline]
_kzalloc_noprof include/linux/slab.h:1312 [inline]
br_vlan_add+0x22d/0x1060 net/bridge/br_vlan.c:790
__vlan_add+0x46b/0x29f0 net/bridge/br_vlan.c:297
nbp_vlan_add+0x27c/0xb20 net/bridge/br_vlan.c:1344
br_vlan_info+0x100/0x470 net/bridge/br_netlink.c:711
br_process_vlan_info+0x61f/0x8b0 net/bridge/br_netlink.c:774
br_afspec+0x3a5/0x600 net/bridge/br_netlink.c:842
br_setlink+0x34f/0x830 net/bridge/br_netlink.c:1159
rtnl_bridge_setlink+0x5b6/0x7e0 net/core/rtnetlink.c:5712
rtnetlink_rcv_msg+0x7b9/0xc00 net/core/rtnetlink.c:7146
page last free pid 1 tgid 1 ts 19980069637 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:
ffff8880482e1000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880482e1080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880482e1100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880482e1180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880482e1200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 6c insb (%dx),%es:(%rdi)
1: 04 00 add $0x0,%al
3: 00 44 89 f8 add %al,-0x8(%rcx,%rcx,4)
7: 4c 8d 2c 85 98 aa c2 lea -0x6e3d5568(,%rax,4),%r13
e: 91
f: 4c 89 e8 mov %r13,%rax
12: 48 c1 e8 03 shr $0x3,%rax
16: 42 0f b6 04 20 movzbl (%rax,%r12,1),%eax
1b: 84 c0 test %al,%al
1d: 4c 89 e3 mov %r12,%rbx
20: 0f 85 66 1d 00 00 jne 0x1d8c
26: 45 8b 6d 00 mov 0x0(%r13),%r13d
* 2a: 44 89 f8 mov %r15d,%eax <-- trapping instruction
2d: ff c0 inc %eax
2f: 4c 8d 24 85 98 aa c2 lea -0x6e3d5568(,%rax,4),%r12
36: 91
37: 4c 89 e0 mov %r12,%rax
3a: 48 c1 e8 03 shr $0x3,%rax
3e: 0f .byte 0xf
3f: b6 .byte 0xb6