==================================================================
BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x46a/0x4b0 net/rose/rose_timer.c:183
Read of size 2 at addr ffff88802f09c42a by task swapper/1/0
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 6.6.99-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:sched_core_balance+0x150/0xff0 kernel/sched/core.c:6376
Code: 14 03 00 00 48 c7 c2 e0 6b aa 8a e8 5a ef 09 00 e9 29 0e 00 00 48 8b 7c 24 38 e8 9b f3 18 09 e8 c6 2c 2e 00 fb 4c 8b 74 24 50 <41> 83 fe 08 0f 83 f1 0d 00 00 48 89 5c 24 78 4c 8d 3c dd 30 0a 7d
RSP: 0018:ffffc900001879c0 EFLAGS: 00000282
RAX: 5b0977f6d46c6900 RBX: 0000000000000001 RCX: 5b0977f6d46c6900
RDX: dffffc0000000000 RSI: ffffffff8aaaba40 RDI: ffffffff8afc6680
RBP: ffffc90000187b48 R08: ffffffff8e4a7cef R09: 1ffffffff1c94f9d
R10: dffffc0000000000 R11: fffffbfff1c94f9e R12: ffff8880b8f3c440
R13: dffffc0000000000 R14: 0000000000000001 R15: 0000000000000000
do_balance_callbacks kernel/sched/core.c:5024 [inline]
__balance_callbacks kernel/sched/core.c:5078 [inline]
finish_lock_switch kernel/sched/core.c:5134 [inline]
finish_task_switch+0x399/0x920 kernel/sched/core.c:5253
context_switch kernel/sched/core.c:5384 [inline]
__schedule+0x14ea/0x4580 kernel/sched/core.c:6700
schedule_idle+0x4e/0x80 kernel/sched/core.c:6802
do_idle+0x4ac/0x510 kernel/sched/idle.c:310
cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:380
start_secondary+0xee/0xf0 arch/x86/kernel/smpboot.c:323
secondary_startup_64_no_verify+0x179/0x17b
Allocated by task 15932:
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]
rose_add_node+0x23a/0xdd0 net/rose/rose_route.c:85
rose_rt_ioctl+0xa42/0xfb0 net/rose/rose_route.c:740
rose_ioctl+0x3cf/0x8b0 net/rose/af_rose.c:1380
sock_do_ioctl+0xd7/0x2f0 net/socket.c:1222
sock_ioctl+0x623/0x7a0 net/socket.c:1341
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:871 [inline]
__se_sys_ioctl+0xfd/0x170 fs/ioctl.c:857
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
__mptcp_close_ssk+0x642/0x11b0 net/mptcp/protocol.c:2423
mptcp_do_fastclose net/mptcp/protocol.c:2731 [inline]
__mptcp_unaccepted_force_close+0x150/0x1a0 net/mptcp/protocol.c:3025
mptcp_subflow_queue_clean+0x1df/0x3c0 net/mptcp/subflow.c:1857
mptcp_check_listen_stop+0x17e/0x240 net/mptcp/protocol.c:3048
__mptcp_close+0xae/0xab0 net/mptcp/protocol.c:3064
mptcp_close+0x28/0x120 net/mptcp/protocol.c:3131
inet_release+0x13d/0x180 net/ipv4/af_inet.c:434
__sock_release net/socket.c:659 [inline]
sock_close+0xbd/0x230 net/socket.c:1421
__fput+0x234/0x970 fs/file_table.c:384
task_work_run+0x1ce/0x250 kernel/task_work.c:239
resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
exit_to_user_mode_loop+0xe6/0x110 kernel/entry/common.c:177
exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
__syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
syscall_exit_to_user_mode+0x1a/0x50 kernel/entry/common.c:302
do_syscall_64+0x61/0xb0 arch/x86/entry/common.c:87
entry_SYSCALL_64_after_hwframe+0x68/0xd2
Second to 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
insert_work+0x3d/0x310 kernel/workqueue.c:1651
__queue_work+0xc39/0x1020 kernel/workqueue.c:1800
call_timer_fn+0x16e/0x530 kernel/time/timer.c:1700
expire_timers kernel/time/timer.c:1746 [inline]
__run_timers+0x558/0x7d0 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
The buggy address belongs to the object at ffff88802f09c400
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
freed 512-byte region [ffff88802f09c400, ffff88802f09c600)
The buggy address belongs to the physical page:
page:ffffea0000bc2700 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88802f09c400 pfn:0x2f09c
head:ffffea0000bc2700 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 ffffea0000857310 ffffea000170f210
raw: ffff88802f09c400 000000000010000f 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 4002, tgid 4002 (kworker/u4:0), ts 14362780765, 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:
ffff88802f09c300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88802f09c380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88802f09c400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88802f09c480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88802f09c500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 14 03 adc $0x3,%al
2: 00 00 add %al,(%rax)
4: 48 c7 c2 e0 6b aa 8a mov $0xffffffff8aaa6be0,%rdx
b: e8 5a ef 09 00 call 0x9ef6a
10: e9 29 0e 00 00 jmp 0xe3e
15: 48 8b 7c 24 38 mov 0x38(%rsp),%rdi
1a: e8 9b f3 18 09 call 0x918f3ba
1f: e8 c6 2c 2e 00 call 0x2e2cea
24: fb sti
25: 4c 8b 74 24 50 mov 0x50(%rsp),%r14
* 2a: 41 83 fe 08 cmp $0x8,%r14d <-- trapping instruction
2e: 0f 83 f1 0d 00 00 jae 0xe25
34: 48 89 5c 24 78 mov %rbx,0x78(%rsp)
39: 4c rex.WR
3a: 8d .byte 0x8d
3b: 3c dd cmp $0xdd,%al
3d: 30 0a xor %cl,(%rdx)
3f: 7d .byte 0x7d