==================================================================
BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x471/0x4b0 net/rose/rose_timer.c:183
Read of size 2 at addr ffff88801168cc2a by task kworker/u8:2/36
CPU: 1 UID: 0 PID: 36 Comm: kworker/u8:2 Not tainted 6.15.0-rc5-syzkaller-01021-g0b28182c73a3 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: netns cleanup_net
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:408 [inline]
print_report+0xb4/0x290 mm/kasan/report.c:521
kasan_report+0x118/0x150 mm/kasan/report.c:634
rose_timer_expiry+0x471/0x4b0 net/rose/rose_timer.c:183
call_timer_fn+0x17b/0x5f0 kernel/time/timer.c:1789
expire_timers kernel/time/timer.c:1840 [inline]
__run_timers kernel/time/timer.c:2414 [inline]
__run_timer_base+0x61a/0x860 kernel/time/timer.c:2426
run_timer_base kernel/time/timer.c:2435 [inline]
run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2445
handle_softirqs+0x283/0x870 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xa8/0x110 kernel/locking/spinlock.c:194
Code: 74 05 e8 cb a2 6d f6 48 c7 44 24 20 00 00 00 00 9c 8f 44 24 20 f6 44 24 21 02 75 4f f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 f3 24 37 f6 65 8b 05 5c 55 1c 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc90000ad7340 EFLAGS: 00000206
RAX: 27289536417a4f00 RBX: 0000000000000a02 RCX: 27289536417a4f00
RDX: 0000000000000006 RSI: ffffffff8d7517fa RDI: 0000000000000001
RBP: ffffc90000ad73d0 R08: ffffffff8f7f2d77 R09: 1ffffffff1efe5ae
R10: dffffc0000000000 R11: fffffbfff1efe5af R12: dffffc0000000000
R13: 0000000000000a02 R14: ffff888140af8008 R15: 1ffff9200015ae68
kthread_queue_work+0x111/0x180 kernel/kthread.c:1195
synchronize_rcu_expedited_queue_work kernel/rcu/tree_exp.h:498 [inline]
synchronize_rcu_expedited+0x4b3/0x730 kernel/rcu/tree_exp.h:1008
synchronize_rcu+0x11a/0x310 kernel/rcu/tree.c:3311
atomic_notifier_chain_unregister+0x3d/0x50 kernel/notifier.c:195
nsim_fib_destroy+0x72/0x180 drivers/net/netdevsim/fib.c:1656
nsim_dev_reload_destroy+0x2e3/0x490 drivers/net/netdevsim/dev.c:1665
nsim_dev_reload_down+0x8a/0xc0 drivers/net/netdevsim/dev.c:968
devlink_reload+0x1b3/0x8d0 net/devlink/dev.c:461
devlink_pernet_pre_exit+0x1d9/0x3d0 net/devlink/core.c:509
ops_pre_exit_list net/core/net_namespace.c:162 [inline]
ops_undo_list+0x184/0x990 net/core/net_namespace.c:235
cleanup_net+0x4c5/0x8a0 net/core/net_namespace.c:686
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x70e/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Allocated by task 36:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394
kasan_kmalloc include/linux/kasan.h:260 [inline]
__kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4358
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
mld_add_delrec net/ipv6/mcast.c:746 [inline]
igmp6_leave_group net/ipv6/mcast.c:2676 [inline]
igmp6_group_dropped+0x3ac/0xf10 net/ipv6/mcast.c:726
__ipv6_dev_mc_dec+0x2d2/0x390 net/ipv6/mcast.c:1018
addrconf_leave_solict net/ipv6/addrconf.c:2254 [inline]
__ipv6_ifa_notify+0x43d/0xac0 net/ipv6/addrconf.c:6302
addrconf_ifdown+0xe69/0x1880 net/ipv6/addrconf.c:3981
addrconf_notify+0x1bc/0x1010 net/ipv6/addrconf.c:-1
notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2266 [inline]
call_netdevice_notifiers net/core/dev.c:2280 [inline]
dev_close_many+0x29c/0x410 net/core/dev.c:1783
unregister_netdevice_many_notify+0x834/0x2320 net/core/dev.c:11994
unregister_netdevice_many net/core/dev.c:12087 [inline]
default_device_exit_batch+0x819/0x890 net/core/dev.c:12591
ops_exit_list net/core/net_namespace.c:206 [inline]
ops_undo_list+0x522/0x990 net/core/net_namespace.c:253
cleanup_net+0x4c5/0x8a0 net/core/net_namespace.c:686
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x70e/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Freed by task 53:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x62/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2380 [inline]
slab_free_freelist_hook mm/slub.c:2409 [inline]
slab_free_bulk mm/slub.c:4666 [inline]
kmem_cache_free_bulk+0x2d1/0x520 mm/slub.c:5243
kfree_bulk include/linux/slab.h:794 [inline]
kvfree_rcu_bulk+0xe5/0x1e0 mm/slab_common.c:1516
kvfree_rcu_drain_ready mm/slab_common.c:1699 [inline]
kfree_rcu_monitor+0x211/0x2a0 mm/slab_common.c:1772
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x70e/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:47
kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:548
kvfree_call_rcu+0xbb/0x410 mm/slab_common.c:1962
mld_clear_delrec+0x193/0x5d0 net/ipv6/mcast.c:828
ipv6_mc_destroy_dev+0x45/0x5a0 net/ipv6/mcast.c:2842
addrconf_ifdown+0x139e/0x1880 net/ipv6/addrconf.c:4000
addrconf_notify+0x1bc/0x1010 net/ipv6/addrconf.c:-1
notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2266 [inline]
call_netdevice_notifiers net/core/dev.c:2280 [inline]
unregister_netdevice_many_notify+0x15d8/0x2320 net/core/dev.c:12024
unregister_netdevice_many net/core/dev.c:12087 [inline]
default_device_exit_batch+0x819/0x890 net/core/dev.c:12591
ops_exit_list net/core/net_namespace.c:206 [inline]
ops_undo_list+0x522/0x990 net/core/net_namespace.c:253
cleanup_net+0x4c5/0x8a0 net/core/net_namespace.c:686
process_one_work kernel/workqueue.c:3238 [inline]
process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319
worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
kthread+0x70e/0x8a0 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
The buggy address belongs to the object at ffff88801168cc00
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
freed 512-byte region [ffff88801168cc00, ffff88801168ce00)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1168c
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 ffff88801a041c80 ffffea0001f8b000 dead000000000002
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801a041c80 ffffea0001f8b000 dead000000000002
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea000045a301 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5836, tgid 5836 (syz-executor), ts 93323119585, free_ts 93235514942
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1d8/0x230 mm/page_alloc.c:1714
prep_new_page mm/page_alloc.c:1722 [inline]
get_page_from_freelist+0x21e0/0x22c0 mm/page_alloc.c:3684
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4966
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2301
alloc_slab_page mm/slub.c:2450 [inline]
allocate_slab+0x8a/0x3b0 mm/slub.c:2618
new_slab mm/slub.c:2672 [inline]
___slab_alloc+0xbfc/0x1480 mm/slub.c:3858
__slab_alloc mm/slub.c:3948 [inline]
__slab_alloc_node mm/slub.c:4023 [inline]
slab_alloc_node mm/slub.c:4184 [inline]
__do_kmalloc_node mm/slub.c:4326 [inline]
__kmalloc_noprof+0x305/0x4f0 mm/slub.c:4339
kmalloc_noprof include/linux/slab.h:909 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
fib6_info_alloc+0x30/0xf0 net/ipv6/ip6_fib.c:155
ip6_route_info_create+0x147/0xa70 net/ipv6/route.c:3782
ip6_route_add+0x29/0x2f0 net/ipv6/route.c:3909
addrconf_prefix_route net/ipv6/addrconf.c:2487 [inline]
inet6_addr_add+0x6b2/0xc00 net/ipv6/addrconf.c:3052
inet6_rtm_newaddr+0x93d/0xd20 net/ipv6/addrconf.c:5063
rtnetlink_rcv_msg+0x7cc/0xb70 net/core/rtnetlink.c:6955
netlink_rcv_skb+0x219/0x490 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x758/0x8d0 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1883
page last free pid 5836 tgid 5836 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1258 [inline]
__free_frozen_pages+0xb14/0xce0 mm/page_alloc.c:2721
discard_slab mm/slub.c:2716 [inline]
__put_partials+0x161/0x1c0 mm/slub.c:3185
put_cpu_partial+0x17c/0x250 mm/slub.c:3260
__slab_free+0x2f7/0x400 mm/slub.c:4512
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4147 [inline]
slab_alloc_node mm/slub.c:4196 [inline]
__do_kmalloc_node mm/slub.c:4326 [inline]
__kmalloc_noprof+0x224/0x4f0 mm/slub.c:4339
kmalloc_noprof include/linux/slab.h:909 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
fib_create_info+0x1728/0x3210 net/ipv4/fib_semantics.c:1409
fib_table_insert+0xc6/0x1b50 net/ipv4/fib_trie.c:1212
fib_magic+0x2c4/0x390 net/ipv4/fib_frontend.c:1133
fib_add_ifaddr+0x144/0x5f0 net/ipv4/fib_frontend.c:1155
fib_inetaddr_event+0x12e/0x190 net/ipv4/fib_frontend.c:1469
notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
blocking_notifier_call_chain+0x6a/0x90 kernel/notifier.c:380
__inet_insert_ifa+0xa13/0xbf0 net/ipv4/devinet.c:567
Memory state around the buggy address:
ffff88801168cb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88801168cb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88801168cc00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88801168cc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801168cd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 74 05 je 0x7
2: e8 cb a2 6d f6 call 0xf66da2d2
7: 48 c7 44 24 20 00 00 movq $0x0,0x20(%rsp)
e: 00 00
10: 9c pushf
11: 8f 44 24 20 pop 0x20(%rsp)
15: f6 44 24 21 02 testb $0x2,0x21(%rsp)
1a: 75 4f jne 0x6b
1c: f7 c3 00 02 00 00 test $0x200,%ebx
22: 74 01 je 0x25
24: fb sti
25: bf 01 00 00 00 mov $0x1,%edi
* 2a: e8 f3 24 37 f6 call 0xf6372522 <-- trapping instruction
2f: 65 8b 05 5c 55 1c 07 mov %gs:0x71c555c(%rip),%eax # 0x71c5592
36: 85 c0 test %eax,%eax
38: 74 40 je 0x7a
3a: 48 rex.W
3b: c7 .byte 0xc7
3c: 04 24 add $0x24,%al
3e: 0e (bad)
3f: 36 ss