==================================================================
BUG: KASAN: use-after-free in rose_send_frame+0x131/0x220 net/rose/rose_link.c:106
Write of size 8 at addr ffff8880575f5018 by task kworker/0:1/14
CPU: 0 PID: 14 Comm: kworker/0:1 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: events fqdir_free_fn
Call Trace:
dump_stack_lvl+0x168/0x22e lib/dump_stack.c:106
print_address_description mm/kasan/report.c:316 [inline]
print_report+0xa8/0x210 mm/kasan/report.c:420
kasan_report+0x10b/0x140 mm/kasan/report.c:524
rose_send_frame+0x131/0x220 net/rose/rose_link.c:106
rose_transmit_restart_request net/rose/rose_link.c:198 [inline]
rose_t0timer_expiry+0x13f/0x350 net/rose/rose_link.c:83
call_timer_fn+0x1a0/0x670 kernel/time/timer.c:1701
expire_timers kernel/time/timer.c:1752 [inline]
__run_timers+0x529/0x7d0 kernel/time/timer.c:2023
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:2036
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:csd_lock_wait kernel/smp.c:424 [inline]
RIP: 0010:smp_call_function_single+0x393/0x560 kernel/smp.c:787
Code: b6 04 34 84 c0 0f 85 2d 01 00 00 44 8b 2b 44 89 ee 83 e6 01 31 ff e8 4c f1 0a 00 41 83 e5 01 75 07 e8 e1 ed 0a 00 eb 3c f3 90 <43> 0f b6 04 34 84 c0 75 0f f7 03 01 00 00 00 74 24 e8 c7 ed 0a 00
RSP: 0018:ffffc90000137a80 EFLAGS: 00000293
RAX: ffffffff8175f209 RBX: ffffc90000137ac8 RCX: ffff88813feb1dc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000137b78 R08: dffffc0000000000 R09: fffff52000026f19
R10: fffff52000026f19 R11: 1ffff92000026f18 R12: 1ffff92000026f59
R13: 0000000000000001 R14: dffffc0000000000 R15: 0000000000000000
rcu_barrier+0x33c/0x600 kernel/rcu/tree.c:4075
fqdir_free_fn+0x2f/0x130 net/ipv4/inet_fragment.c:166
process_one_work+0x898/0x1160 kernel/workqueue.c:2292
worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Allocated by task 8963:
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
kmalloc include/linux/slab.h:563 [inline]
rose_add_node+0x227/0xe80 net/rose/rose_route.c:85
rose_rt_ioctl+0xb13/0xf20 net/rose/rose_route.c:748
rose_ioctl+0x27a/0x790 net/rose/af_rose.c:1381
sock_do_ioctl+0xd3/0x2f0 net/socket.c:1204
sock_ioctl+0x4ed/0x6e0 net/socket.c:1321
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl+0xfa/0x170 fs/ioctl.c:856
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
Freed by task 5407:
kasan_save_stack mm/kasan/common.c:45 [inline]
kasan_set_track+0x4b/0x70 mm/kasan/common.c:52
kasan_save_free_info+0x2d/0x50 mm/kasan/generic.c:516
____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:236
kasan_slab_free include/linux/kasan.h:177 [inline]
slab_free_hook mm/slub.c:1729 [inline]
slab_free_freelist_hook+0x131/0x1a0 mm/slub.c:1755
slab_free mm/slub.c:3687 [inline]
__kmem_cache_free+0xb6/0x1f0 mm/slub.c:3700
rose_neigh_put include/net/rose.h:166 [inline]
rose_timer_expiry+0x4a7/0x5d0 net/rose/rose_timer.c:183
call_timer_fn+0x1a0/0x670 kernel/time/timer.c:1701
expire_timers kernel/time/timer.c:1752 [inline]
__run_timers+0x529/0x7d0 kernel/time/timer.c:2023
run_timer_softirq+0x63/0xf0 kernel/time/timer.c:2036
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
Last potentially related work creation:
kasan_save_stack+0x3a/0x60 mm/kasan/common.c:45
__kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:486
kvfree_call_rcu+0x108/0x870 kernel/rcu/tree.c:3405
mld_clear_delrec+0x198/0x5d0 net/ipv6/mcast.c:824
ipv6_mc_destroy_dev+0x41/0x590 net/ipv6/mcast.c:2798
addrconf_ifdown+0x151f/0x1a10 net/ipv6/addrconf.c:3941
addrconf_notify+0x405/0xf40 net/ipv6/addrconf.c:-1
notifier_call_chain kernel/notifier.c:87 [inline]
raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:455
call_netdevice_notifiers_extack net/core/dev.c:2039 [inline]
call_netdevice_notifiers net/core/dev.c:2053 [inline]
unregister_netdevice_many+0xfdc/0x1840 net/core/dev.c:10990
default_device_exit_batch+0x9c3/0xa50 net/core/dev.c:11503
ops_exit_list net/core/net_namespace.c:177 [inline]
cleanup_net+0x77b/0xb80 net/core/net_namespace.c:640
process_one_work+0x898/0x1160 kernel/workqueue.c:2292
worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Second to last potentially related work creation:
kasan_save_stack+0x3a/0x60 mm/kasan/common.c:45
__kasan_record_aux_stack+0xb2/0xc0 mm/kasan/generic.c:486
kvfree_call_rcu+0x108/0x870 kernel/rcu/tree.c:3405
drop_sysctl_table+0x2fa/0x430 fs/proc/proc_sysctl.c:1731
drop_sysctl_table+0x2e9/0x430 fs/proc/proc_sysctl.c:1734
unregister_sysctl_table+0x85/0x130 fs/proc/proc_sysctl.c:1769
mpls_dev_sysctl_unregister+0x8b/0xc0 net/mpls/af_mpls.c:1445
mpls_dev_notify+0x555/0x760 net/mpls/af_mpls.c:1657
notifier_call_chain kernel/notifier.c:87 [inline]
raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:455
call_netdevice_notifiers_extack net/core/dev.c:2039 [inline]
call_netdevice_notifiers net/core/dev.c:2053 [inline]
unregister_netdevice_many+0xfdc/0x1840 net/core/dev.c:10990
default_device_exit_batch+0x9c3/0xa50 net/core/dev.c:11503
ops_exit_list net/core/net_namespace.c:177 [inline]
cleanup_net+0x77b/0xb80 net/core/net_namespace.c:640
process_one_work+0x898/0x1160 kernel/workqueue.c:2292
worker_thread+0xaa2/0x1250 kernel/workqueue.c:2439
kthread+0x29d/0x330 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
The buggy address belongs to the object at ffff8880575f5000
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
512-byte region [ffff8880575f5000, ffff8880575f5200)
The buggy address belongs to the physical page:
page:ffffea00015d7d00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x575f4
head:ffffea00015d7d00 order:2 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 0000000000000000 dead000000000001 ffff888017441c80
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 4269, tgid 4269 (syz-executor), ts 79989748957, free_ts 79985626111
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:1799
allocate_slab mm/slub.c:1944 [inline]
new_slab+0x87/0x2c0 mm/slub.c:1997
___slab_alloc+0xbc6/0x1230 mm/slub.c:3154
__slab_alloc mm/slub.c:3240 [inline]
slab_alloc_node mm/slub.c:3325 [inline]
__kmem_cache_alloc_node+0x1a0/0x260 mm/slub.c:3398
__do_kmalloc_node mm/slab_common.c:935 [inline]
__kmalloc+0xa0/0x240 mm/slab_common.c:949
kmalloc include/linux/slab.h:568 [inline]
kzalloc include/linux/slab.h:699 [inline]
new_dir fs/proc/proc_sysctl.c:973 [inline]
get_subdir fs/proc/proc_sysctl.c:1017 [inline]
__register_sysctl_table+0x96c/0xe70 fs/proc/proc_sysctl.c:1379
__addrconf_sysctl_register+0x268/0x3d0 net/ipv6/addrconf.c:7150
addrconf_sysctl_register+0x15c/0x1b0 net/ipv6/addrconf.c:7197
ipv6_add_dev+0xbe0/0x1120 net/ipv6/addrconf.c:451
addrconf_notify+0x634/0xf40 net/ipv6/addrconf.c:3595
notifier_call_chain kernel/notifier.c:87 [inline]
raw_notifier_call_chain+0xcb/0x160 kernel/notifier.c:455
call_netdevice_notifiers_extack net/core/dev.c:2039 [inline]
call_netdevice_notifiers net/core/dev.c:2053 [inline]
register_netdevice+0x1600/0x1aa0 net/core/dev.c:10237
macvlan_common_newlink+0x10b3/0x1830 drivers/net/macvlan.c:1512
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1459 [inline]
free_pcp_prepare mm/page_alloc.c:1509 [inline]
free_unref_page_prepare+0x8b4/0x9a0 mm/page_alloc.c:3384
free_unref_page+0x2e/0x3f0 mm/page_alloc.c:3479
__stack_depot_save+0x435/0x460 lib/stackdepot.c:506
kasan_save_stack mm/kasan/common.c:46 [inline]
kasan_set_track+0x60/0x70 mm/kasan/common.c:52
kasan_save_free_info+0x2d/0x50 mm/kasan/generic.c:516
____kasan_slab_free+0x126/0x1e0 mm/kasan/common.c:236
kasan_slab_free include/linux/kasan.h:177 [inline]
slab_free_hook mm/slub.c:1729 [inline]
slab_free_freelist_hook+0x131/0x1a0 mm/slub.c:1755
slab_free mm/slub.c:3687 [inline]
kmem_cache_free+0xf7/0x290 mm/slub.c:3709
uevent_net_broadcast_untagged lib/kobject_uevent.c:337 [inline]
kobject_uevent_net_broadcast+0x40d/0x530 lib/kobject_uevent.c:409
kobject_uevent_env+0x54c/0x8a0 lib/kobject_uevent.c:608
device_add+0x91c/0xfb0 drivers/base/core.c:3678
nsim_bus_dev_new drivers/net/netdevsim/bus.c:290 [inline]
new_device_store+0x368/0x670 drivers/net/netdevsim/bus.c:167
kernfs_fop_write_iter+0x3b2/0x520 fs/kernfs/file.c:352
call_write_iter include/linux/fs.h:2265 [inline]
new_sync_write fs/read_write.c:491 [inline]
vfs_write+0x44c/0x960 fs/read_write.c:584
ksys_write+0x143/0x240 fs/read_write.c:637
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
Memory state around the buggy address:
ffff8880575f4f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880575f4f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880575f5000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880575f5080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880575f5100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
vkms_vblank_simulate: vblank timer overrun
----------------
Code disassembly (best guess):
0: b6 04 mov $0x4,%dh
2: 34 84 xor $0x84,%al
4: c0 0f 85 rorb $0x85,(%rdi)
7: 2d 01 00 00 44 sub $0x44000001,%eax
c: 8b 2b mov (%rbx),%ebp
e: 44 89 ee mov %r13d,%esi
11: 83 e6 01 and $0x1,%esi
14: 31 ff xor %edi,%edi
16: e8 4c f1 0a 00 call 0xaf167
1b: 41 83 e5 01 and $0x1,%r13d
1f: 75 07 jne 0x28
21: e8 e1 ed 0a 00 call 0xaee07
26: eb 3c jmp 0x64
28: f3 90 pause
* 2a: 43 0f b6 04 34 movzbl (%r12,%r14,1),%eax <-- trapping instruction
2f: 84 c0 test %al,%al
31: 75 0f jne 0x42
33: f7 03 01 00 00 00 testl $0x1,(%rbx)
39: 74 24 je 0x5f
3b: e8 c7 ed 0a 00 call 0xaee07