==================================================================
BUG: KASAN: slab-use-after-free in __hlist_del include/linux/list.h:982 [inline]
BUG: KASAN: slab-use-after-free in hlist_del_rcu include/linux/rculist.h:560 [inline]
BUG: KASAN: slab-use-after-free in __xfrm_state_delete+0x9e5/0xa30 net/xfrm/xfrm_state.c:830
Write of size 8 at addr ffff88805a9188b0 by task swapper/0/0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xcd/0x630 mm/kasan/report.c:482
kasan_report+0xe0/0x110 mm/kasan/report.c:595
__hlist_del include/linux/list.h:982 [inline]
hlist_del_rcu include/linux/rculist.h:560 [inline]
__xfrm_state_delete+0x9e5/0xa30 net/xfrm/xfrm_state.c:830
xfrm_timer_handler+0x86c/0xf10 net/xfrm/xfrm_state.c:716
__run_hrtimer kernel/time/hrtimer.c:1761 [inline]
__hrtimer_run_queues+0x1ff/0xad0 kernel/time/hrtimer.c:1825
hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1842
handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:sched_core_balance+0xa0/0xeb0 kernel/sched/core.c:6382
Code: 12 5c 8e e8 62 3a 0d 00 e8 9d b2 09 0a 41 5b 85 c0 0f 85 31 0a 00 00 4c 89 e7 e8 7b 72 fe ff e8 96 e6 38 00 fb 48 63 44 24 50 <48> c7 c3 00 53 d8 93 48 89 44 24 08 48 83 f8 07 0f 87 9c 0c 00 00
RSP: 0018:ffffffff8e207b10 EFLAGS: 00000206
RAX: 0000000000000000 RBX: ffff8880b8423f10 RCX: ffffffff81c3746f
RDX: 0000000000000000 RSI: ffffffff8de522e0 RDI: ffffffff8c162d80
RBP: ffffffff8e207c30 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff90ab6b97 R11: 0000000000000000 R12: ffff8880b843a300
R13: ffff88801f774880 R14: 0000000000000000 R15: dffffc0000000000
do_balance_callbacks kernel/sched/core.c:5011 [inline]
__balance_callbacks kernel/sched/core.c:5065 [inline]
finish_lock_switch kernel/sched/core.c:5104 [inline]
finish_task_switch.isra.0+0x46f/0xc10 kernel/sched/core.c:5223
context_switch kernel/sched/core.c:5360 [inline]
__schedule+0x1198/0x5de0 kernel/sched/core.c:6961
schedule_idle+0x5c/0x90 kernel/sched/core.c:7084
do_idle+0x2b6/0x510 kernel/sched/idle.c:358
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:428
rest_init+0x16b/0x2b0 init/main.c:744
start_kernel+0x3ee/0x4d0 init/main.c:1097
x86_64_start_reservations+0x18/0x30 arch/x86/kernel/head64.c:307
x86_64_start_kernel+0x130/0x190 arch/x86/kernel/head64.c:288
common_startup_64+0x13e/0x148
Allocated by task 10333:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
unpoison_slab_object mm/kasan/common.c:330 [inline]
__kasan_slab_alloc+0x89/0x90 mm/kasan/common.c:356
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4191 [inline]
slab_alloc_node mm/slub.c:4240 [inline]
kmem_cache_alloc_noprof+0x1cb/0x3b0 mm/slub.c:4247
xfrm_state_alloc+0x23/0x5c0 net/xfrm/xfrm_state.c:733
__find_acq_core+0xb59/0x2900 net/xfrm/xfrm_state.c:1833
xfrm_find_acq+0x7b/0xa0 net/xfrm/xfrm_state.c:2353
xfrm_alloc_userspi+0x58e/0xbb0 net/xfrm/xfrm_user.c:1863
xfrm_user_rcv_msg+0x58e/0xc00 net/xfrm/xfrm_user.c:3501
netlink_rcv_skb+0x155/0x420 net/netlink/af_netlink.c:2552
xfrm_netlink_rcv+0x71/0x90 net/xfrm/xfrm_user.c:3523
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x5aa/0x870 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1896
sock_sendmsg_nosec net/socket.c:714 [inline]
__sock_sendmsg net/socket.c:729 [inline]
____sys_sendmsg+0xa98/0xc70 net/socket.c:2614
___sys_sendmsg+0x134/0x1d0 net/socket.c:2668
__sys_sendmsg+0x16d/0x220 net/socket.c:2700
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 5982:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:243 [inline]
__kasan_slab_free+0x60/0x70 mm/kasan/common.c:275
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2422 [inline]
slab_free mm/slub.c:4695 [inline]
kmem_cache_free+0x2d1/0x4d0 mm/slub.c:4797
xfrm_state_free net/xfrm/xfrm_state.c:591 [inline]
xfrm_state_gc_destroy net/xfrm/xfrm_state.c:618 [inline]
xfrm_state_gc_task+0x50a/0x770 net/xfrm/xfrm_state.c:634
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3236
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c2/0x780 kernel/kthread.c:463
ret_from_fork+0x5d4/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
The buggy address belongs to the object at ffff88805a918880
which belongs to the cache xfrm_state of size 928
The buggy address is located 48 bytes inside of
freed 928-byte region [ffff88805a918880, ffff88805a918c20)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5a918
head: order:2 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 ffff8881452e6140 dead000000000122 0000000000000000
raw: 0000000000000000 00000000800f000f 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff8881452e6140 dead000000000122 0000000000000000
head: 0000000000000000 00000000800f000f 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea00016a4601 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 7443, tgid 7440 (syz.3.375), ts 207982577898, free_ts 201180519511
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1c0/0x230 mm/page_alloc.c:1851
prep_new_page mm/page_alloc.c:1859 [inline]
get_page_from_freelist+0x132b/0x38e0 mm/page_alloc.c:3858
__alloc_frozen_pages_noprof+0x261/0x23f0 mm/page_alloc.c:5148
alloc_pages_mpol+0x1fb/0x550 mm/mempolicy.c:2416
alloc_slab_page mm/slub.c:2492 [inline]
allocate_slab mm/slub.c:2660 [inline]
new_slab+0x247/0x330 mm/slub.c:2714
___slab_alloc+0xcf2/0x1750 mm/slub.c:3901
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3992
__slab_alloc_node mm/slub.c:4067 [inline]
slab_alloc_node mm/slub.c:4228 [inline]
kmem_cache_alloc_noprof+0xef/0x3b0 mm/slub.c:4247
xfrm_state_alloc+0x23/0x5c0 net/xfrm/xfrm_state.c:733
xfrm_state_construct net/xfrm/xfrm_user.c:889 [inline]
xfrm_add_sa+0x1283/0x5c50 net/xfrm/xfrm_user.c:1019
xfrm_user_rcv_msg+0x58e/0xc00 net/xfrm/xfrm_user.c:3501
netlink_rcv_skb+0x155/0x420 net/netlink/af_netlink.c:2552
xfrm_netlink_rcv+0x71/0x90 net/xfrm/xfrm_user.c:3523
netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
netlink_unicast+0x5aa/0x870 net/netlink/af_netlink.c:1346
netlink_sendmsg+0x8d1/0xdd0 net/netlink/af_netlink.c:1896
sock_sendmsg_nosec net/socket.c:714 [inline]
__sock_sendmsg net/socket.c:729 [inline]
____sys_sendmsg+0xa98/0xc70 net/socket.c:2614
page last free pid 7367 tgid 7367 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1395 [inline]
free_unref_folios+0xa61/0x16b0 mm/page_alloc.c:2952
folios_put_refs+0x56f/0x740 mm/swap.c:997
folio_batch_release include/linux/pagevec.h:101 [inline]
truncate_inode_pages_range+0x311/0xe50 mm/truncate.c:383
kill_bdev block/bdev.c:91 [inline]
blkdev_flush_mapping+0xfb/0x290 block/bdev.c:712
blkdev_put_whole+0xc4/0xf0 block/bdev.c:719
bdev_release+0x47e/0x6d0 block/bdev.c:1144
blkdev_release+0x15/0x20 block/fops.c:699
__fput+0x402/0xb70 fs/file_table.c:468
task_work_run+0x150/0x240 kernel/task_work.c:227
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0x86f/0x2bf0 kernel/exit.c:961
do_group_exit+0xd3/0x2a0 kernel/exit.c:1102
__do_sys_exit_group kernel/exit.c:1113 [inline]
__se_sys_exit_group kernel/exit.c:1111 [inline]
__x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1111
x64_sys_call+0x14fa/0x1720 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88805a918780: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
ffff88805a918800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88805a918880: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88805a918900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88805a918980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess), 3 bytes skipped:
0: e8 62 3a 0d 00 call 0xd3a67
5: e8 9d b2 09 0a call 0xa09b2a7
a: 41 5b pop %r11
c: 85 c0 test %eax,%eax
e: 0f 85 31 0a 00 00 jne 0xa45
14: 4c 89 e7 mov %r12,%rdi
17: e8 7b 72 fe ff call 0xfffe7297
1c: e8 96 e6 38 00 call 0x38e6b7
21: fb sti
22: 48 63 44 24 50 movslq 0x50(%rsp),%rax
* 27: 48 c7 c3 00 53 d8 93 mov $0xffffffff93d85300,%rbx <-- trapping instruction
2e: 48 89 44 24 08 mov %rax,0x8(%rsp)
33: 48 83 f8 07 cmp $0x7,%rax
37: 0f 87 9c 0c 00 00 ja 0xcd9