==================================================================
BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x46a/0x4b0 net/rose/rose_timer.c:183
Read of size 2 at addr ffff88805ecc602a by task syz-executor/5795

CPU: 1 PID: 5795 Comm: syz-executor Not tainted 6.6.100-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <IRQ>
 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
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:687
RIP: 0010:preempt_count_add+0x52/0x1a0 kernel/sched/core.c:5849
Code: 00 00 00 83 3d fe 31 8f 15 00 75 07 65 8b 05 7d 47 a8 7e 65 01 3d 76 47 a8 7e 48 c7 c0 80 a4 ea 96 48 c1 e8 03 42 0f b6 04 38 <84> c0 0f 85 e6 00 00 00 83 3d cf 31 8f 15 00 75 11 65 8b 05 4e 47
RSP: 0000:ffffc9000457fed0 EFLAGS: 00000a06
RAX: 0000000000000004 RBX: ffff88807e04da00 RCX: ffffffff96eaa403
RDX: dffffc0000000000 RSI: ffffffff8aaaba40 RDI: 0000000000000001
RBP: 0000000000000000 R08: ffffffff8e4a7daf R09: 1ffffffff1c94fb5
R10: dffffc0000000000 R11: fffffbfff1c94fb6 R12: 0000000000000000
R13: 0000000000000000 R14: 1ffff1100fc09b40 R15: dffffc0000000000
 schedule+0xb6/0x170 kernel/sched/core.c:6773
 exit_to_user_mode_loop+0x47/0x110 kernel/entry/common.c:165
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
 irqentry_exit_to_user_mode+0x9/0x40 kernel/entry/common.c:315
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:692
RIP: 0033:0x7f0cf4566330
Code: 77 c3 0f 1f 84 00 00 00 00 00 c5 fe 6f 16 c5 fe 6f 5c 16 e1 c5 fe 7f 17 c5 fe 7f 5c 17 e1 c5 f8 77 c3 0f 1f 84 00 00 00 00 00 <48> 89 f1 48 89 f8 c5 f9 ef c0 83 e1 7f 83 f9 40 0f 86 e5 01 00 00
RSP: 002b:00007fffd5937f78 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007fffd5937fa0 RCX: 0000000000000000
RDX: 0000000000000006 RSI: 00007f0cf46120fc RDI: 00007fffd5937fa0
RBP: 0000000000000003 R08: 00007fffd5937fcc R09: 00007fffd59383b7
R10: 00007fffd5938020 R11: 0000000000000202 R12: 00007f0cf4783e40
R13: 00007fffd5937f9c R14: 0000000000000000 R15: 00007f0cf4786000
 </TASK>

Allocated by task 7732:
 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]
 kmalloc_array include/linux/slab.h:636 [inline]
 dtSearch+0xb2/0x21b0 fs/jfs/jfs_dtree.c:585
 jfs_create+0x2cf/0xa40 fs/jfs/namei.c:113
 vfs_create+0x1f4/0x360 fs/namei.c:3190
 do_mknodat+0x3c8/0x4f0 fs/namei.c:4041
 __do_sys_mknod fs/namei.c:4074 [inline]
 __se_sys_mknod fs/namei.c:4072 [inline]
 __x64_sys_mknod+0x8e/0xa0 fs/namei.c:4072
 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

Freed by task 7732:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4e/0x70 mm/kasan/common.c:52
 kasan_save_free_info+0x2e/0x50 mm/kasan/generic.c:522
 ____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:236
 kasan_slab_free include/linux/kasan.h:164 [inline]
 slab_free_hook mm/slub.c:1806 [inline]
 slab_free_freelist_hook+0x130/0x1b0 mm/slub.c:1832
 slab_free mm/slub.c:3816 [inline]
 __kmem_cache_free+0xba/0x1f0 mm/slub.c:3829
 dtSearch+0x1d20/0x21b0 fs/jfs/jfs_dtree.c:797
 jfs_create+0x2cf/0xa40 fs/jfs/namei.c:113
 vfs_create+0x1f4/0x360 fs/namei.c:3190
 do_mknodat+0x3c8/0x4f0 fs/namei.c:4041
 __do_sys_mknod fs/namei.c:4074 [inline]
 __se_sys_mknod fs/namei.c:4072 [inline]
 __x64_sys_mknod+0x8e/0xa0 fs/namei.c:4072
 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
 insert_work+0x3d/0x310 kernel/workqueue.c:1651
 __queue_work+0xd2c/0x1020 kernel/workqueue.c:1804
 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

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
 __call_rcu_common kernel/rcu/tree.c:2721 [inline]
 call_rcu+0x158/0x930 kernel/rcu/tree.c:2837
 fib6_info_release include/net/ip6_fib.h:339 [inline]
 ip6_route_add+0xe4/0x130 net/ipv6/route.c:3894
 addrconf_prefix_route net/ipv6/addrconf.c:2451 [inline]
 add_v4_addrs+0x8b4/0xbc0 net/ipv6/addrconf.c:3239
 addrconf_sit_config net/ipv6/addrconf.c:3488 [inline]
 addrconf_init_auto_addrs+0x39b/0xaa0 net/ipv6/addrconf.c:3526
 addrconf_notify+0xb62/0x1010 net/ipv6/addrconf.c:3713
 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]
 __dev_notify_flags+0x18e/0x2e0 net/core/dev.c:-1
 dev_change_flags+0xe8/0x1a0 net/core/dev.c:8750
 do_setlink+0xc74/0x3fb0 net/core/rtnetlink.c:2905
 __rtnl_newlink net/core/rtnetlink.c:3703 [inline]
 rtnl_newlink+0x175b/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

The buggy address belongs to the object at ffff88805ecc6000
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
 freed 512-byte region [ffff88805ecc6000, ffff88805ecc6200)

The buggy address belongs to the physical page:
page:ffffea00017b3100 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x5ecc4
head:ffffea00017b3100 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0xfff00000000840(slab|head|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 00fff00000000840 ffff888017841c80 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000100010 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 5795, tgid 5795 (syz-executor), ts 70053036808, free_ts 17766799218
 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
 __do_kmalloc_node mm/slab_common.c:1006 [inline]
 __kmalloc+0xa4/0x240 mm/slab_common.c:1020
 kmalloc include/linux/slab.h:604 [inline]
 kzalloc include/linux/slab.h:721 [inline]
 fib6_info_alloc+0x32/0xe0 net/ipv6/ip6_fib.c:155
 ip6_route_info_create+0x44f/0x1200 net/ipv6/route.c:3793
 addrconf_f6i_alloc+0x1c6/0x400 net/ipv6/route.c:4621
 ipv6_add_addr+0x576/0x1090 net/ipv6/addrconf.c:1129
 inet6_addr_add+0x57e/0xb60 net/ipv6/addrconf.c:3032
 inet6_rtm_newaddr+0x68d/0x940 net/ipv6/addrconf.c:5004
 rtnetlink_rcv_msg+0x7c7/0xf10 net/core/rtnetlink.c:6475
 netlink_rcv_skb+0x216/0x480 net/netlink/af_netlink.c:2555
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1154 [inline]
 free_unref_page_prepare+0x7ce/0x8e0 mm/page_alloc.c:2336
 free_unref_page+0x32/0x2e0 mm/page_alloc.c:2429
 free_contig_range+0xa1/0x160 mm/page_alloc.c:6369
 destroy_args+0x87/0x770 mm/debug_vm_pgtable.c:1015
 debug_vm_pgtable+0x3cc/0x410 mm/debug_vm_pgtable.c:1395
 do_one_initcall+0x1fd/0x750 init/main.c:1238
 do_initcall_level+0x137/0x1f0 init/main.c:1300
 do_initcalls+0x69/0xd0 init/main.c:1316
 kernel_init_freeable+0x3d2/0x570 init/main.c:1553
 kernel_init+0x1d/0x1c0 init/main.c:1443
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293

Memory state around the buggy address:
 ffff88805ecc5f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88805ecc5f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88805ecc6000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff88805ecc6080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88805ecc6100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	00 00                	add    %al,(%rax)
   2:	00 83 3d fe 31 8f    	add    %al,-0x70ce01c3(%rbx)
   8:	15 00 75 07 65       	adc    $0x65077500,%eax
   d:	8b 05 7d 47 a8 7e    	mov    0x7ea8477d(%rip),%eax        # 0x7ea84790
  13:	65 01 3d 76 47 a8 7e 	add    %edi,%gs:0x7ea84776(%rip)        # 0x7ea84790
  1a:	48 c7 c0 80 a4 ea 96 	mov    $0xffffffff96eaa480,%rax
  21:	48 c1 e8 03          	shr    $0x3,%rax
  25:	42 0f b6 04 38       	movzbl (%rax,%r15,1),%eax
* 2a:	84 c0                	test   %al,%al <-- trapping instruction
  2c:	0f 85 e6 00 00 00    	jne    0x118
  32:	83 3d cf 31 8f 15 00 	cmpl   $0x0,0x158f31cf(%rip)        # 0x158f3208
  39:	75 11                	jne    0x4c
  3b:	65                   	gs
  3c:	8b                   	.byte 0x8b
  3d:	05                   	.byte 0x5
  3e:	4e                   	rex.WRX
  3f:	47                   	rex.RXB