==================================================================
BUG: KASAN: slab-use-after-free in rose_send_frame+0x73/0x220 net/rose/rose_link.c:101
Read of size 8 at addr ffff8880318e6020 by task kworker/1:4/5877

CPU: 1 UID: 0 PID: 5877 Comm: kworker/1:4 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025
Workqueue: rcu_gp process_srcu
Call Trace:
 <IRQ>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xca/0x240 mm/kasan/report.c:482
 kasan_report+0x118/0x150 mm/kasan/report.c:595
 rose_send_frame+0x73/0x220 net/rose/rose_link.c:101
 rose_transmit_restart_request net/rose/rose_link.c:198 [inline]
 rose_t0timer_expiry+0x143/0x350 net/rose/rose_link.c:83
 call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747
 expire_timers kernel/time/timer.c:1798 [inline]
 __run_timers kernel/time/timer.c:2372 [inline]
 __run_timer_base+0x61a/0x860 kernel/time/timer.c:2384
 run_timer_base kernel/time/timer.c:2393 [inline]
 run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
 handle_softirqs+0x286/0x870 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697
RIP: 0010:preempt_count_add+0x42/0x1a0 kernel/sched/core.c:5797
Code: 79 99 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 f1 00 00 00 83 3d 1e 73 e9 17 00 75 07 65 8b 05 05 30 de 10 65 01 3d fe 2f de 10 <48> c7 c0 40 63 79 99 48 c1 e8 03 42 0f b6 04 38 84 c0 0f 85 ec 00
RSP: 0018:ffffc900044ef880 EFLAGS: 00000282
RAX: 0000000080000000 RBX: 0000000000002af9 RCX: ffffffff99796303
RDX: 0000000000000108 RSI: ffffffff8bbf05c0 RDI: 0000000000000001
RBP: 0000000000000001 R08: ffff8880b8936d97 R09: 1ffff11017126db2
R10: dffffc0000000000 R11: ffffffff8b44f5e0 R12: 000000000000001f
R13: 0000000000000002 R14: 0000010885cb9acc R15: dffffc0000000000
 delay_tsc+0x65/0xc0 arch/x86/lib/delay.c:79
 udelay include/asm-generic/delay.h:64 [inline]
 try_check_zero+0x5dd/0x670 kernel/rcu/srcutree.c:1118
 srcu_advance_state kernel/rcu/srcutree.c:1764 [inline]
 process_srcu+0x2c6/0x1410 kernel/rcu/srcutree.c:1873
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3346
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3427
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Allocated by task 11961:
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 poison_kmalloc_redzone mm/kasan/common.c:400 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:417
 kasan_kmalloc include/linux/kasan.h:262 [inline]
 __kmalloc_cache_noprof+0x3d5/0x6f0 mm/slub.c:5763
 kmalloc_noprof include/linux/slab.h:957 [inline]
 rose_add_node+0x23a/0xeb0 net/rose/rose_route.c:85
 rose_rt_ioctl+0xce2/0x1240 net/rose/rose_route.c:748
 rose_ioctl+0x3ce/0x8b0 net/rose/af_rose.c:1381
 sock_do_ioctl+0xdc/0x300 net/socket.c:1254
 sock_ioctl+0x576/0x790 net/socket.c:1375
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 5837:
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 __kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:587
 kasan_save_free_info mm/kasan/kasan.h:406 [inline]
 poison_slab_object mm/kasan/common.c:252 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284
 kasan_slab_free include/linux/kasan.h:234 [inline]
 slab_free_hook mm/slub.c:2539 [inline]
 slab_free mm/slub.c:6630 [inline]
 kfree+0x19a/0x6d0 mm/slub.c:6837
 rose_neigh_put include/net/rose.h:166 [inline]
 rose_timer_expiry+0x4cb/0x600 net/rose/rose_timer.c:183
 call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747
 expire_timers kernel/time/timer.c:1798 [inline]
 __run_timers kernel/time/timer.c:2372 [inline]
 __run_timer_base+0x61a/0x860 kernel/time/timer.c:2384
 run_timer_base kernel/time/timer.c:2393 [inline]
 run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
 handle_softirqs+0x286/0x870 kernel/softirq.c:622
 __do_softirq kernel/softirq.c:656 [inline]
 invoke_softirq kernel/softirq.c:496 [inline]
 __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:723
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1052
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697

The buggy address belongs to the object at ffff8880318e6000
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 32 bytes inside of
 freed 512-byte region [ffff8880318e6000, ffff8880318e6200)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0xffff8880318e5000 pfn:0x318e4
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 ffff88801a026c80 ffffea00015b0710 ffffea0001d97c10
raw: ffff8880318e5000 000000000010000c 00000000f5000000 0000000000000000
head: 00fff00000000240 ffff88801a026c80 ffffea00015b0710 ffffea0001d97c10
head: ffff8880318e5000 000000000010000c 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0000c63901 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 1, tgid 1 (swapper/0), ts 19210221587, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x240/0x2a0 mm/page_alloc.c:1850
 prep_new_page mm/page_alloc.c:1858 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3884
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5183
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2416
 alloc_slab_page mm/slub.c:3055 [inline]
 allocate_slab+0x96/0x350 mm/slub.c:3228
 new_slab mm/slub.c:3282 [inline]
 ___slab_alloc+0xe94/0x18a0 mm/slub.c:4651
 __slab_alloc+0x65/0x100 mm/slub.c:4770
 __slab_alloc_node mm/slub.c:4846 [inline]
 slab_alloc_node mm/slub.c:5268 [inline]
 __do_kmalloc_node mm/slub.c:5641 [inline]
 __kmalloc_node_track_caller_noprof+0x5c7/0x800 mm/slub.c:5751
 __do_krealloc mm/slub.c:6979 [inline]
 krealloc_node_align_noprof+0x140/0x390 mm/slub.c:7038
 add_sysfs_param+0xd4/0xa30 kernel/params.c:655
 kernel_add_sysfs_param+0x7f/0xe0 kernel/params.c:812
 param_sysfs_builtin+0x18a/0x230 kernel/params.c:851
 param_sysfs_builtin_init+0x23/0x30 kernel/params.c:987
 do_one_initcall+0x236/0x820 init/main.c:1283
 do_initcall_level+0x104/0x190 init/main.c:1345
 do_initcalls+0x59/0xa0 init/main.c:1361
page_owner free stack trace missing

Memory state around the buggy address:
 ffff8880318e5f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880318e5f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880318e6000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                               ^
 ffff8880318e6080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880318e6100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	79 99                	jns    0xffffff9b
   2:	48 c1 e8 03          	shr    $0x3,%rax
   6:	42 0f b6 04 38       	movzbl (%rax,%r15,1),%eax
   b:	84 c0                	test   %al,%al
   d:	0f 85 f1 00 00 00    	jne    0x104
  13:	83 3d 1e 73 e9 17 00 	cmpl   $0x0,0x17e9731e(%rip)        # 0x17e97338
  1a:	75 07                	jne    0x23
  1c:	65 8b 05 05 30 de 10 	mov    %gs:0x10de3005(%rip),%eax        # 0x10de3028
  23:	65 01 3d fe 2f de 10 	add    %edi,%gs:0x10de2ffe(%rip)        # 0x10de3028
* 2a:	48 c7 c0 40 63 79 99 	mov    $0xffffffff99796340,%rax <-- trapping instruction
  31:	48 c1 e8 03          	shr    $0x3,%rax
  35:	42 0f b6 04 38       	movzbl (%rax,%r15,1),%eax
  3a:	84 c0                	test   %al,%al
  3c:	0f                   	.byte 0xf
  3d:	85 ec                	test   %ebp,%esp