syzbot

==================================================================
BUG: KASAN: slab-use-after-free in rose_timer_expiry+0x46a/0x4b0 net/rose/rose_timer.c:183
Read of size 2 at addr ffff88802fe2142a by task syz-executor/9643

CPU: 0 PID: 9643 Comm: syz-executor Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
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/0x220 mm/kasan/report.c:468
 kasan_report+0x117/0x150 mm/kasan/report.c:581
 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_schedule_irq+0xb0/0x140 kernel/sched/core.c:7009
Code: 44 24 20 f6 44 24 21 02 74 0b 0f 0b 48 f7 03 08 00 00 00 74 63 bf 01 00 00 00 e8 eb 29 e5 f6 e8 e6 b2 15 f7 fb bf 01 00 00 00 <e8> db b5 ff ff 48 c7 44 24 40 00 00 00 00 9c 8f 44 24 40 8b 44 24
RSP: 0018:ffffc9000497f0c0 EFLAGS: 00000282
RAX: 85ed689edb997f00 RBX: 0000000000000000 RCX: 85ed689edb997f00
RDX: dffffc0000000000 RSI: ffffffff8aaaba20 RDI: 0000000000000001
RBP: ffffc9000497f160 R08: ffffffff90da550f R09: 1ffffffff21b4aa1
R10: dffffc0000000000 R11: fffffbfff21b4aa2 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff9200092fe18
 irqentry_exit+0x67/0x70 kernel/entry/common.c:438
 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:692
RIP: 0010:lockdep_unregister_key+0x4e6/0x580 kernel/locking/lockdep.c:6490
Code: 54 d5 90 48 c7 c6 10 ab 67 81 e8 45 09 08 00 e8 10 1c 08 00 e9 67 fc ff ff e8 a6 4e 06 09 41 f7 c4 00 02 00 00 74 d1 fb 84 db <75> d0 eb e1 0f 0b 31 db eb a1 0f 0b e9 fd fe ff ff e8 84 4d 06 09
RSP: 0018:ffffc9000497f220 EFLAGS: 00000246
RAX: 85ed689edb997f00 RBX: 0000000000000000 RCX: 85ed689edb997f00
RDX: 0000000000000001 RSI: ffffffff8aaac700 RDI: ffffffff8afc7040
RBP: ffffc9000497f300 R08: ffffffff90d56c3f R09: 1ffffffff21aad87
R10: dffffc0000000000 R11: fffffbfff21aad88 R12: 0000000000000a03
R13: ffffffff9075a920 R14: ffff888059c16299 R15: 1ffff9200092fe48
 __qdisc_destroy+0x128/0x3c0 net/sched/sch_generic.c:1078
 qdisc_put net/sched/sch_generic.c:1104 [inline]
 dev_shutdown+0x34f/0x440 net/sched/sch_generic.c:1492
 unregister_netdevice_many_notify+0x8d2/0x1810 net/core/dev.c:11076
 unregister_netdevice_many net/core/dev.c:11142 [inline]
 unregister_netdevice_queue+0x324/0x360 net/core/dev.c:11022
 unregister_netdevice include/linux/netdevice.h:3137 [inline]
 lapbeth_free_device drivers/net/wan/lapbether.c:437 [inline]
 lapbeth_device_event+0x661/0xa10 drivers/net/wan/lapbether.c:472
 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:11086
 unregister_netdevice_many net/core/dev.c:11142 [inline]
 unregister_netdevice_queue+0x324/0x360 net/core/dev.c:11022
 unregister_netdevice include/linux/netdevice.h:3137 [inline]
 nsim_destroy+0x4d/0x180 drivers/net/netdevsim/netdev.c:418
 __nsim_dev_port_del+0x14d/0x1b0 drivers/net/netdevsim/dev.c:1428
 nsim_dev_port_del_all drivers/net/netdevsim/dev.c:1440 [inline]
 nsim_dev_reload_destroy+0x283/0x480 drivers/net/netdevsim/dev.c:1661
 nsim_drv_remove+0x58/0x160 drivers/net/netdevsim/dev.c:1676
 device_remove drivers/base/dd.c:567 [inline]
 __device_release_driver drivers/base/dd.c:1272 [inline]
 device_release_driver_internal+0x468/0x7a0 drivers/base/dd.c:1295
 bus_remove_device+0x342/0x400 drivers/base/bus.c:576
 device_del+0x50b/0x900 drivers/base/core.c:3872
 device_unregister+0x20/0xc0 drivers/base/core.c:3913
 nsim_bus_dev_del drivers/net/netdevsim/bus.c:310 [inline]
 del_device_store+0x2ab/0x360 drivers/net/netdevsim/bus.c:219
 kernfs_fop_write_iter+0x37d/0x4d0 fs/kernfs/file.c:334
 call_write_iter include/linux/fs.h:2018 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x43b/0x940 fs/read_write.c:584
 ksys_write+0x147/0x250 fs/read_write.c:637
 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
RIP: 0033:0x7f5e0778d69f
Code: 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 f9 92 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 31 44 89 c7 48 89 44 24 08 e8 4c 93 02 00 48
RSP: 002b:00007ffe66254900 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 00007f5e0778d69f
RDX: 0000000000000001 RSI: 00007ffe66254950 RDI: 0000000000000005
RBP: 00007f5e078130c1 R08: 0000000000000000 R09: 00007ffe66254757
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000001
R13: 00007ffe66254950 R14: 00007f5e084f4620 R15: 0000000000000003
 </TASK>

Allocated by task 8828:
 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]
 device_private_init drivers/base/core.c:3528 [inline]
 device_add+0xbe/0xc20 drivers/base/core.c:3579
 netdev_register_kobject+0x17a/0x310 net/core/net-sysfs.c:2042
 register_netdevice+0x128f/0x1ae0 net/core/dev.c:10280
 veth_newlink+0x598/0xc30 drivers/net/veth.c:1871
 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:2545
 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
 netlink_unicast+0x751/0x8d0 net/netlink/af_netlink.c:1346
 netlink_sendmsg+0x8c1/0xbe0 net/netlink/af_netlink.c:1894
 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

Freed by task 1112:
 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
 kobject_cleanup lib/kobject.c:689 [inline]
 kobject_release lib/kobject.c:720 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x221/0x470 lib/kobject.c:737
 netdev_run_todo+0xc93/0xd90 net/core/dev.c:10601
 default_device_exit_batch+0x9d0/0xa60 net/core/dev.c:11621
 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

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
 mld_clear_delrec+0x193/0x5d0 net/ipv6/mcast.c:824
 ipv6_mc_destroy_dev+0x45/0x590 net/ipv6/mcast.c:2794
 addrconf_ifdown+0x139f/0x1880 net/ipv6/addrconf.c:3968
 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:11086
 ip_tunnel_delete_nets+0x31c/0x360 net/ipv4/ip_tunnel.c:1171
 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 ffff88802fe21400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 42 bytes inside of
 freed 512-byte region [ffff88802fe21400, ffff88802fe21600)

The buggy address belongs to the physical page:
page:ffffea0000bf8800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2fe20
head:ffffea0000bf8800 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 ffffea00007bd800 dead000000000002
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 4498, tgid 4498 (kworker/u4:3), ts 25776220544, 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:
 ffff88802fe21300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88802fe21380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88802fe21400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                  ^
 ffff88802fe21480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88802fe21500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
   0:	44 24 20             	rex.R and $0x20,%al
   3:	f6 44 24 21 02       	testb  $0x2,0x21(%rsp)
   8:	74 0b                	je     0x15
   a:	0f 0b                	ud2
   c:	48 f7 03 08 00 00 00 	testq  $0x8,(%rbx)
  13:	74 63                	je     0x78
  15:	bf 01 00 00 00       	mov    $0x1,%edi
  1a:	e8 eb 29 e5 f6       	call   0xf6e52a0a
  1f:	e8 e6 b2 15 f7       	call   0xf715b30a
  24:	fb                   	sti
  25:	bf 01 00 00 00       	mov    $0x1,%edi
* 2a:	e8 db b5 ff ff       	call   0xffffb60a <-- trapping instruction
  2f:	48 c7 44 24 40 00 00 	movq   $0x0,0x40(%rsp)
  36:	00 00
  38:	9c                   	pushf
  39:	8f 44 24 40          	pop    0x40(%rsp)
  3d:	8b                   	.byte 0x8b
  3e:	44                   	rex.R
  3f:	24                   	.byte 0x24