==================================================================
BUG: KASAN: use-after-free in rose_timer_expiry+0x470/0x490 net/rose/rose_timer.c:183
Read of size 2 at addr ffff88803004302a by task swapper/1/0
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.1.141-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
print_address_description mm/kasan/report.c:316 [inline]
print_report+0xa8/0x220 mm/kasan/report.c:427
kasan_report+0x10b/0x140 mm/kasan/report.c:531
rose_timer_expiry+0x470/0x490 net/rose/rose_timer.c:183
call_timer_fn+0x1a0/0x670 kernel/time/timer.c:1504
expire_timers kernel/time/timer.c:1549 [inline]
__run_timers+0x525/0x7c0 kernel/time/timer.c:1820
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:1833
handle_softirqs+0x2a1/0x920 kernel/softirq.c:596
__do_softirq kernel/softirq.c:630 [inline]
invoke_softirq kernel/softirq.c:470 [inline]
__irq_exit_rcu+0x12f/0x220 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:sched_core_balance+0x151/0xdc0 kernel/sched/core.c:6236
Code: 6b 8a e8 72 d0 09 00 4c 89 7c 24 38 4c 89 6c 24 28 e9 f4 0b 00 00 48 8b 7c 24 40 e8 99 d0 bf 08 e8 24 69 2d 00 fb 41 83 fd 08 <0f> 83 c1 0b 00 00 4e 8d 34 fd 70 09 3d 8c 4c 89 f0 48 c1 e8 03 48
RSP: 0018:ffffc90000177a60 EFLAGS: 00000297
RAX: 3fcb6c3bd822bf00 RBX: ffff8880b8f3b7c8 RCX: 3fcb6c3bd822bf00
RDX: dffffc0000000000 RSI: ffffffff8a6bffe0 RDI: ffffffff8abf1360
RBP: ffffc90000177bc8 R08: dffffc0000000000 R09: ffffed10171c7551
R10: ffffed10171c7551 R11: 1ffff110171c7550 R12: dffffc0000000000
R13: 0000000000000001 R14: ffffffff8159c7e0 R15: 0000000000000001
do_balance_callbacks kernel/sched/core.c:4892 [inline]
__balance_callbacks kernel/sched/core.c:4946 [inline]
finish_lock_switch kernel/sched/core.c:5002 [inline]
finish_task_switch+0x39d/0x8f0 kernel/sched/core.c:5121
context_switch kernel/sched/core.c:5247 [inline]
__schedule+0x10f1/0x40d0 kernel/sched/core.c:6561
schedule_idle+0x4a/0x90 kernel/sched/core.c:6665
do_idle+0x525/0x570 kernel/sched/idle.c:331
cpu_startup_entry+0x3f/0x60 kernel/sched/idle.c:401
start_secondary+0xe4/0xf0 arch/x86/kernel/smpboot.c:281
secondary_startup_64_no_verify+0xcf/0xdb
Allocated by task 8873:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:374 [inline]
__kasan_kmalloc+0x8e/0xa0 mm/kasan/common.c:383
kasan_kmalloc include/linux/kasan.h:211 [inline]
__do_kmalloc_node mm/slab_common.c:936 [inline]
__kmalloc_node_track_caller+0xae/0x230 mm/slab_common.c:956
kmalloc_reserve net/core/skbuff.c:446 [inline]
__alloc_skb+0x22a/0x7e0 net/core/skbuff.c:515
alloc_skb include/linux/skbuff.h:1271 [inline]
netlink_alloc_large_skb net/netlink/af_netlink.c:1183 [inline]
netlink_sendmsg+0x645/0xbc0 net/netlink/af_netlink.c:1834
sock_sendmsg_nosec net/socket.c:718 [inline]
__sock_sendmsg net/socket.c:730 [inline]
__sys_sendto+0x44f/0x5c0 net/socket.c:2153
__do_sys_sendto net/socket.c:2165 [inline]
__se_sys_sendto net/socket.c:2161 [inline]
__x64_sys_sendto+0xda/0xf0 net/socket.c:2161
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
The buggy address belongs to the object at ffff888030043000
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
512-byte region [ffff888030043000, ffff888030043200)
The buggy address belongs to the physical page:
page:ffffea0000c01000 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888030041c00 pfn:0x30040
head:ffffea0000c01000 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea00008d3f08 ffffea0001581808 ffff888017441c80
raw: ffff888030041c00 000000000010000a 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 3312, tgid 3312 (kworker/u4:4), ts 12722439566, free_ts 0
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x173/0x1a0 mm/page_alloc.c:2532
prep_new_page mm/page_alloc.c:2539 [inline]
get_page_from_freelist+0x1a26/0x1ac0 mm/page_alloc.c:4328
__alloc_pages+0x1df/0x4e0 mm/page_alloc.c:5614
alloc_slab_page+0x5d/0x160 mm/slub.c:1794
allocate_slab mm/slub.c:1939 [inline]
new_slab+0x87/0x2c0 mm/slub.c:1992
___slab_alloc+0xbc6/0x1220 mm/slub.c:3180
__slab_alloc mm/slub.c:3279 [inline]
slab_alloc_node mm/slub.c:3364 [inline]
__kmem_cache_alloc_node+0x1a0/0x260 mm/slub.c:3437
kmalloc_trace+0x26/0xe0 mm/slab_common.c:1026
kmalloc include/linux/slab.h:563 [inline]
kzalloc include/linux/slab.h:699 [inline]
alloc_bprm+0x56/0x730 fs/exec.c:1537
kernel_execve+0x94/0x9c0 fs/exec.c:2004
call_usermodehelper_exec_async+0x207/0x350 kernel/umh.c:113
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
page_owner free stack trace missing
Memory state around the buggy address:
ffff888030042f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888030042f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888030043000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888030043080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888030043100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 6b 8a e8 72 d0 09 00 imul $0x0,0x9d072e8(%rdx),%ecx
7: 4c 89 7c 24 38 mov %r15,0x38(%rsp)
c: 4c 89 6c 24 28 mov %r13,0x28(%rsp)
11: e9 f4 0b 00 00 jmp 0xc0a
16: 48 8b 7c 24 40 mov 0x40(%rsp),%rdi
1b: e8 99 d0 bf 08 call 0x8bfd0b9
20: e8 24 69 2d 00 call 0x2d6949
25: fb sti
26: 41 83 fd 08 cmp $0x8,%r13d
* 2a: 0f 83 c1 0b 00 00 jae 0xbf1 <-- trapping instruction
30: 4e 8d 34 fd 70 09 3d lea -0x73c2f690(,%r15,8),%r14
37: 8c
38: 4c 89 f0 mov %r14,%rax
3b: 48 c1 e8 03 shr $0x3,%rax
3f: 48 rex.W