==================================================================
BUG: KASAN: use-after-free in rose_timer_expiry+0x470/0x490 net/rose/rose_timer.c:183
Read of size 2 at addr ffff888021a2a42a by task dhcpcd-run-hook/7680
CPU: 1 PID: 7680 Comm: dhcpcd-run-hook Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Call Trace:
dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
print_address_description+0x60/0x2d0 mm/kasan/report.c:248
__kasan_report mm/kasan/report.c:434 [inline]
kasan_report+0xdf/0x130 mm/kasan/report.c:451
rose_timer_expiry+0x470/0x490 net/rose/rose_timer.c:183
call_timer_fn+0x16c/0x530 kernel/time/timer.c:1451
expire_timers kernel/time/timer.c:1496 [inline]
__run_timers+0x525/0x7c0 kernel/time/timer.c:1767
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1780
handle_softirqs+0x328/0x820 kernel/softirq.c:576
__do_softirq kernel/softirq.c:610 [inline]
invoke_softirq kernel/softirq.c:450 [inline]
__irq_exit_rcu+0x12f/0x220 kernel/softirq.c:659
irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x32/0x60 kernel/kcov.c:206
Code: a4 a3 8a 7e 65 8b 15 a5 a3 8a 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 34 16 00 00 00 74 2c 8b 91 10 16 00 00 <83> fa 02 75 21 48 8b 91 18 16 00 00 48 8b 32 48 8d 7e 01 8b 89 14
RSP: 0000:ffffc90002727bf0 EFLAGS: 00000246
RAX: ffffffff81ace3fa RBX: 0000000000000001 RCX: ffff88802183bb80
RDX: 0000000000000000 RSI: ffffffff8a59e560 RDI: ffff88802183bb80
RBP: ffffc90002727cb0 R08: dffffc0000000000 R09: fffffbfff1ff7c1f
R10: fffffbfff1ff7c1f R11: 1ffffffff1ff7c1e R12: dffffc0000000000
R13: 1ffff920004e4f80 R14: ffff888016a7c000 R15: 0000000000000200
rcu_lock_release+0xa/0x20 include/linux/rcupdate.h:318
rcu_read_unlock include/linux/rcupdate.h:773 [inline]
count_memcg_event_mm+0x311/0x360 include/linux/memcontrol.h:1082
handle_mm_fault+0x12d/0x43b0 mm/memory.c:4863
do_user_addr_fault+0x489/0xc80 arch/x86/mm/fault.c:1357
handle_page_fault arch/x86/mm/fault.c:1445 [inline]
exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1501
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:606
RIP: 0033:0x7fe4cd669458
Code: 00 45 31 c0 41 0f ba e6 0a 72 7c 48 8b 35 28 6f 07 00 4c 89 ff 44 89 04 24 e8 4a b2 ff ff 48 89 de 4c 89 f9 44 8b 04 24 48 97 a4 41 8d 40 ff 20 47 ff 31 c0 41 f7 c6 40 00 00 00 74 06 49 63
RSP: 002b:00007ffdacee6c20 EFLAGS: 00010206
RAX: 0000000000000003 RBX: 0000561c27fc3d40 RCX: 0000000000000003
RDX: 0000000000000000 RSI: 0000561c27fc3d40 RDI: 0000561c27fd0048
RBP: 0000561c27fbfc30 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000003
Allocated by task 4649:
kasan_save_stack mm/kasan/common.c:38 [inline]
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+0xb5/0xf0 mm/kasan/common.c:522
kmalloc_reserve net/core/skbuff.c:356 [inline]
__alloc_skb+0x22c/0x750 net/core/skbuff.c:427
__netdev_alloc_skb+0x103/0x4a0 net/core/skbuff.c:494
netdev_alloc_skb include/linux/skbuff.h:3024 [inline]
dev_alloc_skb include/linux/skbuff.h:3037 [inline]
__ieee80211_beacon_get+0xa73/0x1f80 net/mac80211/tx.c:5088
ieee80211_beacon_get_tim+0x48/0x840 net/mac80211/tx.c:5202
ieee80211_beacon_get include/net/mac80211.h:4983 [inline]
mac80211_hwsim_beacon_tx+0xf4/0x920 drivers/net/wireless/mac80211_hwsim.c:1812
__iterate_interfaces+0x243/0x500 net/mac80211/util.c:793
ieee80211_iterate_active_interfaces_atomic+0xb3/0x140 net/mac80211/util.c:829
mac80211_hwsim_beacon+0x9b/0x180 drivers/net/wireless/mac80211_hwsim.c:1865
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x53d/0xc40 kernel/time/hrtimer.c:1749
hrtimer_run_softirq+0x176/0x240 kernel/time/hrtimer.c:1766
handle_softirqs+0x328/0x820 kernel/softirq.c:576
__do_softirq kernel/softirq.c:610 [inline]
invoke_softirq kernel/softirq.c:450 [inline]
__irq_exit_rcu+0x12f/0x220 kernel/softirq.c:659
irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
Freed by task 4649:
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:46
kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
____kasan_slab_free+0xd5/0x110 mm/kasan/common.c:366
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1710 [inline]
slab_free_freelist_hook+0xea/0x170 mm/slub.c:1736
slab_free mm/slub.c:3504 [inline]
kfree+0xef/0x2a0 mm/slub.c:4564
skb_free_head net/core/skbuff.c:655 [inline]
skb_release_data+0x6fe/0x850 net/core/skbuff.c:677
skb_release_all net/core/skbuff.c:742 [inline]
__kfree_skb net/core/skbuff.c:756 [inline]
consume_skb+0xa2/0x100 net/core/skbuff.c:914
mac80211_hwsim_beacon_tx+0x4f3/0x920 drivers/net/wireless/mac80211_hwsim.c:1842
__iterate_interfaces+0x243/0x500 net/mac80211/util.c:793
ieee80211_iterate_active_interfaces_atomic+0xb3/0x140 net/mac80211/util.c:829
mac80211_hwsim_beacon+0x9b/0x180 drivers/net/wireless/mac80211_hwsim.c:1865
__run_hrtimer kernel/time/hrtimer.c:1685 [inline]
__hrtimer_run_queues+0x53d/0xc40 kernel/time/hrtimer.c:1749
hrtimer_run_softirq+0x176/0x240 kernel/time/hrtimer.c:1766
handle_softirqs+0x328/0x820 kernel/softirq.c:576
__do_softirq kernel/softirq.c:610 [inline]
invoke_softirq kernel/softirq.c:450 [inline]
__irq_exit_rcu+0x12f/0x220 kernel/softirq.c:659
irq_exit_rcu+0x5/0x20 kernel/softirq.c:671
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1108
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
The buggy address belongs to the object at ffff888021a2a400
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
512-byte region [ffff888021a2a400, ffff888021a2a600)
The buggy address belongs to the page:
page:ffffea0000868a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x21a28
head:ffffea0000868a00 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea000186c600 0000000200000002 ffff888016841c80
raw: 0000000000000000 0000000000100010 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 0x52800(GFP_NOWAIT|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 9, ts 9175416634, free_ts 0
prep_new_page mm/page_alloc.c:2426 [inline]
get_page_from_freelist+0x1b77/0x1c60 mm/page_alloc.c:4192
__alloc_pages+0x1e1/0x470 mm/page_alloc.c:5487
alloc_slab_page mm/slub.c:1780 [inline]
allocate_slab mm/slub.c:1917 [inline]
new_slab+0xc0/0x4b0 mm/slub.c:1980
___slab_alloc+0x81e/0xdf0 mm/slub.c:3013
__slab_alloc mm/slub.c:3100 [inline]
slab_alloc_node mm/slub.c:3191 [inline]
kmem_cache_alloc_node_trace+0x1dd/0x300 mm/slub.c:3275
kmalloc_node include/linux/slab.h:625 [inline]
kzalloc_node include/linux/slab.h:749 [inline]
iolatency_pd_alloc+0x9b/0x170 block/blk-iolatency.c:964
blkcg_activate_policy+0x226/0xbd0 block/blk-cgroup.c:1348
blk_iolatency_init+0x25b/0x470 block/blk-iolatency.c:778
blkcg_init_queue+0x39b/0x430 block/blk-cgroup.c:1225
blk_alloc_queue+0x439/0x5a0 block/blk-core.c:582
blk_mq_init_queue_data block/blk-mq.c:3150 [inline]
blk_mq_init_queue+0x33/0xd0 block/blk-mq.c:3164
scsi_alloc_sdev+0x6f2/0xab0 drivers/scsi/scsi_scan.c:319
scsi_probe_and_add_lun+0x1bf/0x3d00 drivers/scsi/scsi_scan.c:1157
__scsi_scan_target+0x1d8/0x1010 drivers/scsi/scsi_scan.c:1638
scsi_scan_channel drivers/scsi/scsi_scan.c:1726 [inline]
scsi_scan_host_selected+0x36e/0x690 drivers/scsi/scsi_scan.c:1755
do_scsi_scan_host drivers/scsi/scsi_scan.c:1894 [inline]
do_scan_async+0x11a/0x700 drivers/scsi/scsi_scan.c:1904
page_owner free stack trace missing
Memory state around the buggy address:
ffff888021a2a300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888021a2a380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888021a2a400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888021a2a480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888021a2a500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: a4 movsb %ds:(%rsi),%es:(%rdi)
1: a3 8a 7e 65 8b 15 a5 movabs %eax,0x8aa3a5158b657e8a
8: a3 8a
a: 7e 81 jle 0xffffff8d
c: e2 00 loop 0xe
e: 01 ff add %edi,%edi
10: 00 74 11 81 add %dh,-0x7f(%rcx,%rdx,1)
14: fa cli
15: 00 01 add %al,(%rcx)
17: 00 00 add %al,(%rax)
19: 75 35 jne 0x50
1b: 83 b9 34 16 00 00 00 cmpl $0x0,0x1634(%rcx)
22: 74 2c je 0x50
24: 8b 91 10 16 00 00 mov 0x1610(%rcx),%edx
* 2a: 83 fa 02 cmp $0x2,%edx <-- trapping instruction
2d: 75 21 jne 0x50
2f: 48 8b 91 18 16 00 00 mov 0x1618(%rcx),%rdx
36: 48 8b 32 mov (%rdx),%rsi
39: 48 8d 7e 01 lea 0x1(%rsi),%rdi
3d: 8b .byte 0x8b
3e: 89 .byte 0x89
3f: 14 .byte 0x14