==================================================================
BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x471/0x4b0 net/rose/rose_timer.c:183
Read of size 2 at addr ffff88805ec8d82a by task syz-executor/15695
CPU: 1 UID: 0 PID: 15695 Comm: syz-executor Not tainted 6.15.0-rc4-syzkaller-00152-g4397684a292a #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
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 0b d3 6e 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 54 38 f6 65 8b 05 5c d5 1c 07 85 c0 74 40 48 c7 04 24 0e 36
RSP: 0018:ffffc90004fdf9a0 EFLAGS: 00000206
RAX: d13b40ea11738900 RBX: 0000000000000a02 RCX: d13b40ea11738900
RDX: 0000000000000000 RSI: ffffffff8d749ecb RDI: 0000000000000001
RBP: ffffc90004fdfa38 R08: ffffffff8f7ed377 R09: 1ffffffff1efda6e
R10: dffffc0000000000 R11: fffffbfff1efda6f R12: dffffc0000000000
R13: ffffc90013eb0000 R14: ffffffff99aa7170 R15: 1ffff920009fbf34
__debug_check_no_obj_freed lib/debugobjects.c:1108 [inline]
debug_check_no_obj_freed+0x451/0x470 lib/debugobjects.c:1129
remove_vm_area+0x1d3/0x300 mm/vmalloc.c:3241
vfree+0x63/0x330 mm/vmalloc.c:3364
kcov_put kernel/kcov.c:439 [inline]
kcov_close+0x28/0x50 kernel/kcov.c:535
__fput+0x449/0xa70 fs/file_table.c:465
task_work_run+0x1d1/0x260 kernel/task_work.c:227
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0x8d6/0x2550 kernel/exit.c:953
do_group_exit+0x21c/0x2d0 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+0x3f/0x40 kernel/exit.c:1111
x64_sys_call+0x21ba/0x21c0 arch/x86/include/generated/asm/syscalls_64.h:232
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f972d98e969
Code: Unable to access opcode bytes at 0x7f972d98e93f.
RSP: 002b:00007fff3ede11d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000043 RCX: 00007f972d98e969
RDX: 00007f972d98d3e0 RSI: 0000000000000004 RDI: 0000000000000043
RBP: 00007f972dbb6738 R08: 00007fff3eddef76 R09: 0000000000000008
R10: 000000000000001a R11: 0000000000000246 R12: 0000000000000008
R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000000
Allocated by task 15413:
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]
__do_kmalloc_node mm/slub.c:4341 [inline]
__kmalloc_noprof+0x27a/0x4f0 mm/slub.c:4353
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+0x4b3/0x1360 net/ipv6/route.c:3802
addrconf_f6i_alloc+0x1c6/0x3f0 net/ipv6/route.c:4631
ipv6_add_addr+0x56e/0x1090 net/ipv6/addrconf.c:1121
addrconf_add_linklocal+0x28c/0x6c0 net/ipv6/addrconf.c:3313
addrconf_addr_gen+0x490/0x580 net/ipv6/addrconf.c:3444
addrconf_init_auto_addrs+0x7b6/0xb80 net/ipv6/addrconf.c:-1
addrconf_notify+0xacc/0x1010 net/ipv6/addrconf.c:3741
notifier_call_chain+0x1b3/0x3e0 kernel/notifier.c:85
call_netdevice_notifiers_extack net/core/dev.c:2214 [inline]
call_netdevice_notifiers net/core/dev.c:2228 [inline]
__dev_notify_flags+0x18d/0x2e0 net/core/dev.c:-1
netif_change_flags+0xe8/0x1a0 net/core/dev.c:9434
do_setlink+0xcb9/0x40d0 net/core/rtnetlink.c:3152
rtnl_changelink net/core/rtnetlink.c:3769 [inline]
__rtnl_newlink net/core/rtnetlink.c:3928 [inline]
rtnl_newlink+0x160b/0x1c70 net/core/rtnetlink.c:4065
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
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg+0x219/0x270 net/socket.c:727
__sys_sendto+0x3bd/0x520 net/socket.c:2180
__do_sys_sendto net/socket.c:2187 [inline]
__se_sys_sendto net/socket.c:2183 [inline]
__x64_sys_sendto+0xde/0x100 net/socket.c:2183
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 16089:
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:2398 [inline]
slab_free mm/slub.c:4656 [inline]
kfree+0x193/0x440 mm/slub.c:4855
rcu_do_batch kernel/rcu/tree.c:2568 [inline]
rcu_core+0xca5/0x1710 kernel/rcu/tree.c:2824
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
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
__call_rcu_common kernel/rcu/tree.c:3082 [inline]
call_rcu+0x142/0x990 kernel/rcu/tree.c:3202
call_rcu_hurry include/linux/rcupdate.h:115 [inline]
fib6_info_release include/net/ip6_fib.h:343 [inline]
__ip6_del_rt+0x111/0x180 net/ipv6/route.c:3923
ip6_del_rt+0xb3/0x100 net/ipv6/route.c:3934
__ipv6_ifa_notify+0x5c7/0xac0 net/ipv6/addrconf.c:6310
addrconf_ifdown+0xe69/0x1880 net/ipv6/addrconf.c:3978
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:2214 [inline]
call_netdevice_notifiers net/core/dev.c:2228 [inline]
dev_close_many+0x29c/0x410 net/core/dev.c:1731
unregister_netdevice_many_notify+0x834/0x2330 net/core/dev.c:11952
unregister_netdevice_many net/core/dev.c:12046 [inline]
default_device_exit_batch+0x819/0x890 net/core/dev.c:12538
ops_exit_list net/core/net_namespace.c:177 [inline]
cleanup_net+0x7a9/0xbd0 net/core/net_namespace.c:654
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 ffff88805ec8d800
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
freed 512-byte region [ffff88805ec8d800, ffff88805ec8da00)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff88805ec8f000 pfn:0x5ec8c
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000240(workingset|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000240 ffff88801a041c80 ffffea0000d13d10 ffffea0000af3c10
raw: ffff88805ec8f000 000000000010000e 00000000f5000000 0000000000000000
head: 00fff00000000240 ffff88801a041c80 ffffea0000d13d10 ffffea0000af3c10
head: ffff88805ec8f000 000000000010000e 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea00017b2301 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 2, tgid 2 (kthreadd), ts 86538161791, free_ts 26772156027
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1d8/0x230 mm/page_alloc.c:1718
prep_new_page mm/page_alloc.c:1726 [inline]
get_page_from_freelist+0x21ce/0x22b0 mm/page_alloc.c:3688
__alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4970
alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2301
alloc_slab_page mm/slub.c:2468 [inline]
allocate_slab+0x8a/0x3b0 mm/slub.c:2632
new_slab mm/slub.c:2686 [inline]
___slab_alloc+0xbfc/0x1480 mm/slub.c:3872
__slab_alloc mm/slub.c:3962 [inline]
__slab_alloc_node mm/slub.c:4037 [inline]
slab_alloc_node mm/slub.c:4198 [inline]
__kmalloc_cache_noprof+0x296/0x3d0 mm/slub.c:4367
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
set_kthread_struct+0xbb/0x340 kernel/kthread.c:126
copy_process+0x10b7/0x3b80 kernel/fork.c:2357
kernel_clone+0x21e/0x870 kernel/fork.c:2844
kernel_thread+0x10c/0x160 kernel/fork.c:2906
create_kthread kernel/kthread.c:487 [inline]
kthreadd+0x575/0x770 kernel/kthread.c:847
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
page last free pid 1 tgid 1 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1262 [inline]
__free_frozen_pages+0xb0e/0xcd0 mm/page_alloc.c:2725
__free_pages mm/page_alloc.c:5080 [inline]
free_contig_range+0x159/0x440 mm/page_alloc.c:6936
destroy_args+0x86/0x460 mm/debug_vm_pgtable.c:1017
debug_vm_pgtable+0x3cf/0x410 mm/debug_vm_pgtable.c:1397
do_one_initcall+0x233/0x820 init/main.c:1257
do_initcall_level+0x137/0x1f0 init/main.c:1319
do_initcalls+0x69/0xd0 init/main.c:1335
kernel_init_freeable+0x3d9/0x570 init/main.c:1567
kernel_init+0x1d/0x1d0 init/main.c:1457
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Memory state around the buggy address:
ffff88805ec8d700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88805ec8d780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88805ec8d800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88805ec8d880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88805ec8d900: 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 0b d3 6e f6 call 0xf66ed312
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 54 38 f6 call 0xf6385522 <-- trapping instruction
2f: 65 8b 05 5c d5 1c 07 mov %gs:0x71cd55c(%rip),%eax # 0x71cd592
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