==================================================================
BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x46a/0x4b0 net/rose/rose_timer.c:183
Read of size 2 at addr ffff88802727d02a by task syz.5.756/8318
CPU: 1 PID: 8318 Comm: syz.5.756 Not tainted 6.6.100-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:364 [inline]
print_report+0xac/0x200 mm/kasan/report.c:466
kasan_report+0x117/0x150 mm/kasan/report.c:579
rose_timer_expiry+0x46a/0x4b0 net/rose/rose_timer.c:183
call_timer_fn+0x16e/0x530 kernel/time/timer.c:1700
expire_timers kernel/time/timer.c:1751 [inline]
__run_timers+0x52d/0x7d0 kernel/time/timer.c:2022
run_timer_softirq+0x67/0xf0 kernel/time/timer.c:2035
handle_softirqs+0x280/0x820 kernel/softirq.c:578
__do_softirq kernel/softirq.c:612 [inline]
invoke_softirq kernel/softirq.c:452 [inline]
__irq_exit_rcu+0xc7/0x190 kernel/softirq.c:661
irq_exit_rcu+0x9/0x20 kernel/softirq.c:673
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1088 [inline]
sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1088
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:lock_release+0x71/0x8b0 kernel/locking/lockdep.c:5762
Code: 41 48 c7 44 24 68 51 1f 5f 8c 48 c7 44 24 70 e0 89 67 81 4c 8d 7c 24 60 49 c1 ef 03 48 b8 f1 f1 f1 f1 00 f2 f2 f2 4b 89 04 2f <66> 43 c7 44 2f 09 f3 f3 43 c6 44 2f 0b f3 0f 1f 44 00 00 65 8b 05
RSP: 0000:ffffc9000b5878c0 EFLAGS: 00000a06
RAX: f2f2f200f1f1f1f1 RBX: ffffffff81e7cedd RCX: ffff888020efbc00
RDX: 0000000000000000 RSI: ffffffff81e7cedd RDI: ffffffff8cd2fc60
RBP: ffffc9000b5879d8 R08: dffffc0000000000 R09: 1ffffffff21b46a4
R10: dffffc0000000000 R11: fffffbfff21b46a5 R12: ffffffff81e7cedd
R13: dffffc0000000000 R14: 0000000000000001 R15: 1ffff920016b0f24
rcu_lock_release include/linux/rcupdate.h:344 [inline]
rcu_read_unlock_sched include/linux/rcupdate.h:899 [inline]
pfn_valid+0x3c5/0x420 include/linux/mmzone.h:2021
page_table_check_set+0x25/0x6f0 mm/page_table_check.c:110
page_table_check_ptes_set include/linux/page_table_check.h:74 [inline]
set_ptes include/linux/pgtable.h:238 [inline]
set_pte_range+0x679/0x6a0 mm/memory.c:4406
filemap_map_order0_folio mm/filemap.c:3599 [inline]
filemap_map_pages+0xcdd/0x1630 mm/filemap.c:3645
do_fault_around mm/memory.c:4573 [inline]
do_read_fault mm/memory.c:4606 [inline]
do_fault mm/memory.c:4753 [inline]
do_pte_missing mm/memory.c:3688 [inline]
handle_pte_fault mm/memory.c:5025 [inline]
__handle_mm_fault mm/memory.c:5166 [inline]
handle_mm_fault+0x379b/0x4920 mm/memory.c:5331
do_user_addr_fault+0xad0/0x12e0 arch/x86/mm/fault.c:1324
handle_page_fault arch/x86/mm/fault.c:1465 [inline]
exc_page_fault+0x67/0x110 arch/x86/mm/fault.c:1521
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:608
RIP: 0033:0x7f4d8ea6ecfd
Code: ff 48 83 e8 01 48 89 ee bf 01 00 00 00 48 c1 e0 0e 48 c1 ee 06 48 01 c8 48 89 e9 81 e6 ff 3f 00 00 48 c1 e9 03 83 e1 07 d3 e7 <40> 84 bc 06 20 20 00 00 0f 85 11 fd ff ff e9 c0 fd ff ff e8 0b 2b
RSP: 002b:00007fff7675a6d0 EFLAGS: 00010202
RAX: 000000110c380000 RBX: 00007f4d8f8e5720 RCX: 0000000000000006
RDX: 0000000000001fb7 RSI: 0000000000003e7e RDI: 0000000000000040
RBP: ffffffff885f9fb7 R08: 00007f4d8edb6038 R09: 00007f4d8eda2000
R10: 00007f4d8dfff008 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff885f96dd R15: 0000000000000000
Allocated by task 6241:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:374 [inline]
__kasan_kmalloc+0x8f/0xa0 mm/kasan/common.c:383
kmalloc include/linux/slab.h:600 [inline]
kzalloc include/linux/slab.h:721 [inline]
mca_alloc net/ipv6/mcast.c:880 [inline]
__ipv6_dev_mc_inc+0x413/0xac0 net/ipv6/mcast.c:936
ipv6_add_dev+0xd66/0x11f0 net/ipv6/addrconf.c:463
addrconf_notify+0x67b/0x1010 net/ipv6/addrconf.c:3623
notifier_call_chain+0x197/0x390 kernel/notifier.c:93
call_netdevice_notifiers_extack net/core/dev.c:2064 [inline]
call_netdevice_notifiers net/core/dev.c:2078 [inline]
register_netdevice+0x160c/0x1ae0 net/core/dev.c:10301
macvlan_common_newlink+0x1139/0x18f0 drivers/net/macvlan.c:1545
macvtap_newlink+0x154/0x1d0 drivers/net/macvtap.c:108
rtnl_newlink_create net/core/rtnetlink.c:3517 [inline]
__rtnl_newlink net/core/rtnetlink.c:3737 [inline]
rtnl_newlink+0x14d0/0x2020 net/core/rtnetlink.c:3750
rtnetlink_rcv_msg+0x7c7/0xf10 net/core/rtnetlink.c:6475
netlink_rcv_skb+0x216/0x480 net/netlink/af_netlink.c:2555
netlink_unicast_kernel net/netlink/af_netlink.c:1330 [inline]
netlink_unicast+0x751/0x8d0 net/netlink/af_netlink.c:1356
netlink_sendmsg+0x8c1/0xbe0 net/netlink/af_netlink.c:1904
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
__sys_sendto+0x46a/0x620 net/socket.c:2201
__do_sys_sendto net/socket.c:2213 [inline]
__se_sys_sendto net/socket.c:2209 [inline]
__x64_sys_sendto+0xde/0xf0 net/socket.c:2209
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Last potentially related work creation:
kasan_save_stack+0x3e/0x60 mm/kasan/common.c:45
__kasan_record_aux_stack+0xaf/0xc0 mm/kasan/generic.c:492
kvfree_call_rcu+0xee/0x780 kernel/rcu/tree.c:3452
ipv6_mc_destroy_dev+0x3c1/0x590 net/ipv6/mcast.c:2815
addrconf_ifdown+0x139f/0x1880 net/ipv6/addrconf.c:3969
addrconf_notify+0x6c6/0x1010 net/ipv6/addrconf.c:-1
notifier_call_chain+0x197/0x390 kernel/notifier.c:93
call_netdevice_notifiers_extack net/core/dev.c:2064 [inline]
call_netdevice_notifiers net/core/dev.c:2078 [inline]
unregister_netdevice_many_notify+0xf36/0x1810 net/core/dev.c:11074
unregister_netdevice_many net/core/dev.c:11130 [inline]
default_device_exit_batch+0x9cb/0xa60 net/core/dev.c:11608
ops_exit_list net/core/net_namespace.c:178 [inline]
cleanup_net+0x77f/0xb90 net/core/net_namespace.c:652
process_one_work kernel/workqueue.c:2634 [inline]
process_scheduled_works+0xa45/0x15b0 kernel/workqueue.c:2711
worker_thread+0xa55/0xfc0 kernel/workqueue.c:2792
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
The buggy address belongs to the object at ffff88802727d000
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
freed 512-byte region [ffff88802727d000, ffff88802727d200)
The buggy address belongs to the physical page:
page:ffffea00009c9f00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88802727c800 pfn:0x2727c
head:ffffea00009c9f00 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888017841c80 ffffea000070cf10 ffffea00017aa510
raw: ffff88802727c800 000000000010000c 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 2445, tgid 2445 (kworker/u4:0), ts 16877919453, free_ts 0
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x1cd/0x210 mm/page_alloc.c:1554
prep_new_page mm/page_alloc.c:1561 [inline]
get_page_from_freelist+0x195c/0x19f0 mm/page_alloc.c:3191
__alloc_pages+0x1e3/0x460 mm/page_alloc.c:4457
alloc_slab_page+0x5d/0x170 mm/slub.c:1876
allocate_slab mm/slub.c:2023 [inline]
new_slab+0x87/0x2e0 mm/slub.c:2076
___slab_alloc+0xc6d/0x12f0 mm/slub.c:3230
__slab_alloc mm/slub.c:3329 [inline]
__slab_alloc_node mm/slub.c:3382 [inline]
slab_alloc_node mm/slub.c:3475 [inline]
__kmem_cache_alloc_node+0x1a2/0x260 mm/slub.c:3524
kmalloc_trace+0x2a/0xe0 mm/slab_common.c:1098
kmalloc include/linux/slab.h:600 [inline]
kzalloc include/linux/slab.h:721 [inline]
alloc_bprm+0x56/0x9c0 fs/exec.c:1538
kernel_execve+0x98/0x9c0 fs/exec.c:2023
call_usermodehelper_exec_async+0x20b/0x350 kernel/umh.c:110
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
page_owner free stack trace missing
Memory state around the buggy address:
ffff88802727cf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88802727cf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88802727d000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88802727d080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88802727d100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 41 rex.B
1: 48 c7 44 24 68 51 1f movq $0xffffffff8c5f1f51,0x68(%rsp)
8: 5f 8c
a: 48 c7 44 24 70 e0 89 movq $0xffffffff816789e0,0x70(%rsp)
11: 67 81
13: 4c 8d 7c 24 60 lea 0x60(%rsp),%r15
18: 49 c1 ef 03 shr $0x3,%r15
1c: 48 b8 f1 f1 f1 f1 00 movabs $0xf2f2f200f1f1f1f1,%rax
23: f2 f2 f2
26: 4b 89 04 2f mov %rax,(%r15,%r13,1)
* 2a: 66 43 c7 44 2f 09 f3 movw $0xf3f3,0x9(%r15,%r13,1) <-- trapping instruction
31: f3
32: 43 c6 44 2f 0b f3 movb $0xf3,0xb(%r15,%r13,1)
38: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
3d: 65 gs
3e: 8b .byte 0x8b
3f: 05 .byte 0x5