==================================================================
BUG: KASAN: use-after-free in __hlist_del include/linux/list.h:906 [inline]
BUG: KASAN: use-after-free in hlist_del_init_rcu include/linux/rculist.h:184 [inline]
BUG: KASAN: use-after-free in __xfrm_state_delete+0x3db/0x940 net/xfrm/xfrm_state.c:700
Write of size 8 at addr ffff8880643e4428 by task swapper/0/0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
Call Trace:
dump_stack_lvl+0x188/0x24e lib/dump_stack.c:106
print_address_description mm/kasan/report.c:316 [inline]
print_report+0xa8/0x210 mm/kasan/report.c:420
kasan_report+0x10b/0x140 mm/kasan/report.c:524
__hlist_del include/linux/list.h:906 [inline]
hlist_del_init_rcu include/linux/rculist.h:184 [inline]
__xfrm_state_delete+0x3db/0x940 net/xfrm/xfrm_state.c:700
xfrm_timer_handler+0x10b/0x970 net/xfrm/xfrm_state.c:631
__run_hrtimer kernel/time/hrtimer.c:1751 [inline]
__hrtimer_run_queues+0x522/0xc90 kernel/time/hrtimer.c:1815
hrtimer_run_softirq+0x173/0x290 kernel/time/hrtimer.c:1832
handle_softirqs+0x291/0x910 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x13b/0x230 kernel/softirq.c:679
irq_exit_rcu+0x5/0x20 kernel/softirq.c:691
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa0/0xc0 arch/x86/kernel/apic/apic.c:1118
asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:default_idle+0xb/0x10 arch/x86/kernel/process.c:742
Code: 48 89 df e8 e7 7f 92 f7 e9 44 ff ff ff e8 0d 0b f6 ff 00 00 cc cc 00 00 cc cc 00 00 cc cc 00 66 90 0f 00 2d d7 5b 65 00 fb f4 0f 1f 40 00 41 57 41 56 53 49 be 00 00 00 00 00 fc ff df 65 48
RSP: 0018:ffffffff8d807da8 EFLAGS: 000002c2
RAX: db67568c6e077e00 RBX: ffffffff8a415177 RCX: db67568c6e077e00
RDX: 0000000000000001 RSI: ffffffff8aac1cc0 RDI: ffffffff8afe72a0
RBP: ffffffff8d807ec8 R08: ffff8880b8c357db R09: 1ffff11017186afb
R10: dffffc0000000000 R11: ffffed1017186afc R12: 0000000000000000
R13: dffffc0000000000 R14: ffffffff8d8bc740 R15: 1ffffffff1b00fc0
default_idle_call+0x84/0xc0 kernel/sched/idle.c:109
cpuidle_idle_call kernel/sched/idle.c:199 [inline]
do_idle+0x3a2/0x680 kernel/sched/idle.c:323
cpu_startup_entry+0x3f/0x60 kernel/sched/idle.c:422
rest_init+0x2dc/0x300 init/main.c:706
arch_call_rest_init+0xa/0xa init/main.c:865
start_kernel+0x480/0x50d init/main.c:1113
secondary_startup_64_no_verify+0xcf/0xdb
Allocated by task 19616:
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
__kasan_slab_alloc+0x6b/0x80 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook+0x4b/0x490 mm/slab.h:742
slab_alloc_node mm/slub.c:3366 [inline]
slab_alloc mm/slub.c:3374 [inline]
__kmem_cache_alloc_lru mm/slub.c:3381 [inline]
kmem_cache_alloc+0x18b/0x2f0 mm/slub.c:3390
kmem_cache_zalloc include/linux/slab.h:689 [inline]
xfrm_state_alloc+0x1e/0x2a0 net/xfrm/xfrm_state.c:648
xfrm_state_find+0x1c62/0x28d0 net/xfrm/xfrm_state.c:1179
xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:2421 [inline]
xfrm_tmpl_resolve net/xfrm/xfrm_policy.c:2466 [inline]
xfrm_resolve_and_create_bundle+0x7b7/0x2da0 net/xfrm/xfrm_policy.c:2758
xfrm_lookup_with_ifid+0x265/0x1fc0 net/xfrm/xfrm_policy.c:3092
xfrm_lookup net/xfrm/xfrm_policy.c:3221 [inline]
xfrm_lookup_route+0x38/0x1b0 net/xfrm/xfrm_policy.c:3232
rawv6_sendmsg+0xcb2/0x1710 net/ipv6/raw.c:896
sock_sendmsg_nosec net/socket.c:718 [inline]
__sock_sendmsg net/socket.c:730 [inline]
____sys_sendmsg+0x5ed/0x9a0 net/socket.c:2519
___sys_sendmsg+0x2a2/0x360 net/socket.c:2573
__sys_sendmmsg+0x2c3/0x510 net/socket.c:2659
__do_sys_sendmmsg net/socket.c:2688 [inline]
__se_sys_sendmmsg net/socket.c:2685 [inline]
__x64_sys_sendmmsg+0x9c/0xb0 net/socket.c:2685
do_syscall_x64 arch/x86/entry/common.c:46 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Freed by task 7:
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
kasan_save_free_info+0x27/0x40 mm/kasan/generic.c:516
____kasan_slab_free+0x126/0x1f0 mm/kasan/common.c:237
kasan_slab_free include/linux/kasan.h:177 [inline]
slab_free_hook mm/slub.c:1735 [inline]
slab_free_freelist_hook+0x133/0x1b0 mm/slub.c:1761
slab_free mm/slub.c:3694 [inline]
kmem_cache_free+0xf7/0x2a0 mm/slub.c:3716
xfrm_state_free net/xfrm/xfrm_state.c:507 [inline]
xfrm_state_gc_destroy net/xfrm/xfrm_state.c:535 [inline]
xfrm_state_gc_task+0x7d6/0xa30 net/xfrm/xfrm_state.c:551
process_one_work+0x8ab/0x1160 kernel/workqueue.c:2292
worker_thread+0xaf5/0x12a0 kernel/workqueue.c:2439
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
The buggy address belongs to the object at ffff8880643e4400
which belongs to the cache xfrm_state of size 848
The buggy address is located 40 bytes inside of
848-byte region [ffff8880643e4400, ffff8880643e4750)
The buggy address belongs to the physical page:
page:ffffea000190f900 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff8880643e4000 pfn:0x643e4
head:ffffea000190f900 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000001 ffff88801f6dd8c0
raw: ffff8880643e4000 000000008010000f 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 0x152a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 18943, tgid 18940 (syz.4.3153), ts 2090647592818, free_ts 2008698154708
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2560
prep_new_page mm/page_alloc.c:2567 [inline]
get_page_from_freelist+0x206b/0x2180 mm/page_alloc.c:4358
__alloc_pages+0x1ec/0x4f0 mm/page_alloc.c:5658
alloc_slab_page+0x5d/0x180 mm/slub.c:1805
allocate_slab mm/slub.c:1950 [inline]
new_slab+0x87/0x2d0 mm/slub.c:2003
___slab_alloc+0xbc5/0x1240 mm/slub.c:3161
__slab_alloc mm/slub.c:3247 [inline]
slab_alloc_node mm/slub.c:3332 [inline]
slab_alloc mm/slub.c:3374 [inline]
__kmem_cache_alloc_lru mm/slub.c:3381 [inline]
kmem_cache_alloc+0x111/0x2f0 mm/slub.c:3390
kmem_cache_zalloc include/linux/slab.h:689 [inline]
xfrm_state_alloc+0x1e/0x2a0 net/xfrm/xfrm_state.c:648
xfrm_state_find+0x1c62/0x28d0 net/xfrm/xfrm_state.c:1179
xfrm_tmpl_resolve_one net/xfrm/xfrm_policy.c:2421 [inline]
xfrm_tmpl_resolve net/xfrm/xfrm_policy.c:2466 [inline]
xfrm_resolve_and_create_bundle+0x7b7/0x2da0 net/xfrm/xfrm_policy.c:2758
xfrm_lookup_with_ifid+0x265/0x1fc0 net/xfrm/xfrm_policy.c:3092
xfrm_lookup net/xfrm/xfrm_policy.c:3221 [inline]
xfrm_lookup_route+0x38/0x1b0 net/xfrm/xfrm_policy.c:3232
rawv6_sendmsg+0xcb2/0x1710 net/ipv6/raw.c:896
sock_sendmsg_nosec net/socket.c:718 [inline]
__sock_sendmsg net/socket.c:730 [inline]
____sys_sendmsg+0x5ed/0x9a0 net/socket.c:2519
___sys_sendmsg+0x2a2/0x360 net/socket.c:2573
__sys_sendmmsg+0x2c3/0x510 net/socket.c:2659
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1487 [inline]
free_pcp_prepare mm/page_alloc.c:1537 [inline]
free_unref_page_prepare+0x8e5/0x9e0 mm/page_alloc.c:3414
free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3509
free_slab mm/slub.c:2042 [inline]
discard_slab mm/slub.c:2048 [inline]
__unfreeze_partials+0x188/0x1e0 mm/slub.c:2598
put_cpu_partial+0x17c/0x250 mm/slub.c:2674
qlink_free mm/kasan/quarantine.c:166 [inline]
qlist_free_all+0x76/0xe0 mm/kasan/quarantine.c:185
kasan_quarantine_reduce+0x144/0x160 mm/kasan/quarantine.c:292
__kasan_slab_alloc+0x1e/0x80 mm/kasan/common.c:306
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook+0x4b/0x490 mm/slab.h:742
slab_alloc_node mm/slub.c:3366 [inline]
slab_alloc mm/slub.c:3374 [inline]
__kmem_cache_alloc_lru mm/slub.c:3381 [inline]
kmem_cache_alloc+0x18b/0x2f0 mm/slub.c:3390
ptlock_alloc+0x1c/0x60 mm/memory.c:6045
ptlock_init include/linux/mm.h:2480 [inline]
pgtable_pte_page_ctor include/linux/mm.h:2507 [inline]
__pte_alloc_one include/asm-generic/pgalloc.h:66 [inline]
pte_alloc_one+0xc0/0x310 arch/x86/mm/pgtable.c:33
__pte_alloc+0x21/0x150 mm/memory.c:468
do_anonymous_page mm/memory.c:4157 [inline]
handle_pte_fault mm/memory.c:5027 [inline]
__handle_mm_fault mm/memory.c:5171 [inline]
handle_mm_fault+0x34b1/0x3d40 mm/memory.c:5292
do_user_addr_fault+0x5a9/0xbb0 arch/x86/mm/fault.c:1338
handle_page_fault arch/x86/mm/fault.c:1429 [inline]
exc_page_fault+0x60/0x100 arch/x86/mm/fault.c:1482
asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:608
Memory state around the buggy address:
ffff8880643e4300: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc
ffff8880643e4380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880643e4400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880643e4480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880643e4500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 48 89 df mov %rbx,%rdi
3: e8 e7 7f 92 f7 call 0xf7927fef
8: e9 44 ff ff ff jmp 0xffffff51
d: e8 0d 0b f6 ff call 0xfff60b1f
12: 00 00 add %al,(%rax)
14: cc int3
15: cc int3
16: 00 00 add %al,(%rax)
18: cc int3
19: cc int3
1a: 00 00 add %al,(%rax)
1c: cc int3
1d: cc int3
1e: 00 66 90 add %ah,-0x70(%rsi)
21: 0f 00 2d d7 5b 65 00 verw 0x655bd7(%rip) # 0x655bff
28: fb sti
29: f4 hlt
* 2a: c3 ret <-- trapping instruction
2b: 0f 1f 40 00 nopl 0x0(%rax)
2f: 41 57 push %r15
31: 41 56 push %r14
33: 53 push %rbx
34: 49 be 00 00 00 00 00 movabs $0xdffffc0000000000,%r14
3b: fc ff df
3e: 65 gs
3f: 48 rex.W