==================================================================
BUG: KASAN: slab-use-after-free in __lock_acquire+0x2de0/0x3cb0 kernel/locking/lockdep.c:5007
Read of size 8 at addr ffff8880577fd418 by task kworker/u32:0/11
CPU: 0 PID: 11 Comm: kworker/u32:0 Not tainted 6.10.0-syzkaller-08676-g720261cfc732 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: netns cleanup_net
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
print_address_description mm/kasan/report.c:377 [inline]
print_report+0xc3/0x620 mm/kasan/report.c:488
kasan_report+0xd9/0x110 mm/kasan/report.c:601
__lock_acquire+0x2de0/0x3cb0 kernel/locking/lockdep.c:5007
lock_acquire kernel/locking/lockdep.c:5759 [inline]
lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5724
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
p9_tag_remove net/9p/client.c:397 [inline]
p9_req_put net/9p/client.c:405 [inline]
p9_req_put+0xca/0x250 net/9p/client.c:402
req_done+0x1e7/0x2f0 net/9p/trans_virtio.c:147
vring_interrupt drivers/virtio/virtio_ring.c:2595 [inline]
vring_interrupt+0x31b/0x400 drivers/virtio/virtio_ring.c:2570
__handle_irq_event_percpu+0x229/0x7c0 kernel/irq/handle.c:158
handle_irq_event_percpu kernel/irq/handle.c:193 [inline]
handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:210
handle_edge_irq+0x263/0xd10 kernel/irq/chip.c:831
generic_handle_irq_desc include/linux/irqdesc.h:173 [inline]
handle_irq arch/x86/kernel/irq.c:247 [inline]
call_irq_handler arch/x86/kernel/irq.c:259 [inline]
__common_interrupt+0xdf/0x250 arch/x86/kernel/irq.c:285
common_interrupt+0x52/0xd0 arch/x86/kernel/irq.c:278
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
RIP: 0010:handle_softirqs+0x1da/0x8f0 kernel/softirq.c:540
Code: 89 44 24 18 48 89 6c 24 10 48 c7 c7 40 60 2b 8b e8 6b 78 91 09 65 66 c7 05 09 d3 b0 7e 00 00 e8 7c af 42 00 fb bb ff ff ff ff <49> c7 c6 c0 a0 80 8d 41 0f bc dc 83 c3 01 0f 85 a7 00 00 00 e9 b4
RSP: 0018:ffffc90000007f30 EFLAGS: 00000202
RAX: 00000000006e8092 RBX: 00000000ffffffff RCX: 1ffffffff2848b2d
RDX: 0000000000000000 RSI: ffffffff8b2cc020 RDI: ffffffff8b904c00
RBP: ffff888015f42440 R08: 0000000000000001 R09: fffffbfff2847e69
R10: ffffffff9423f34f R11: 0000000000000000 R12: 0000000000000082
R13: 000000000000000a R14: 0000000000000001 R15: 0000000000000000
__do_softirq kernel/softirq.c:588 [inline]
invoke_softirq kernel/softirq.c:428 [inline]
__irq_exit_rcu kernel/softirq.c:637 [inline]
irq_exit_rcu+0xbb/0x120 kernel/softirq.c:649
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
sysvec_apic_timer_interrupt+0x95/0xb0 arch/x86/kernel/apic/apic.c:1043
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:lockdep_unregister_key+0x1ab/0x280 kernel/locking/lockdep.c:6482
Code: f2 22 94 48 89 df e8 54 fd ff ff 48 89 df e8 5c d9 ff ff e8 57 db ff ff 9c 58 f6 c4 02 75 66 41 f7 c5 00 02 00 00 74 01 fb 5b <5d> 41 5c 41 5d 41 5e 41 5f e9 67 0c 0a 00 48 c7 c0 b8 cd e4 8f 48
RSP: 0018:ffffc900003d7858 EFLAGS: 00000206
RAX: 0000000000000046 RBX: ffff88805669e800 RCX: 0000000000000001
RDX: dffffc0000000000 RSI: ffffffff8b2cc2e0 RDI: ffffffff8b904c00
RBP: ffff88805669ea98 R08: ffffffff92eb631a R09: 000000000001f98d
R10: ffffffff94239087 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000246 R14: ffffffff943d28a8 R15: ffff88805669eaa0
__qdisc_destroy+0x11a/0x4a0 net/sched/sch_generic.c:1079
qdisc_put+0xd1/0xf0 net/sched/sch_generic.c:1105
dev_shutdown+0x1c4/0x430 net/sched/sch_generic.c:1493
unregister_netdevice_many_notify+0x620/0x1e40 net/core/dev.c:11333
unregister_netdevice_many net/core/dev.c:11405 [inline]
default_device_exit_batch+0x731/0x9b0 net/core/dev.c:11888
ops_exit_list+0x128/0x180 net/core/net_namespace.c:178
cleanup_net+0x5b7/0xbf0 net/core/net_namespace.c:640
process_one_work+0x958/0x1ad0 kernel/workqueue.c:3231
process_scheduled_works kernel/workqueue.c:3312 [inline]
worker_thread+0x6c8/0xf20 kernel/workqueue.c:3390
kthread+0x2c1/0x3a0 kernel/kthread.c:389
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Allocated by task 9462:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:370 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:387
kmalloc_noprof include/linux/slab.h:681 [inline]
p9_client_create+0xcf/0x11b0 net/9p/client.c:983
v9fs_session_init+0x1f8/0x1a80 fs/9p/v9fs.c:410
v9fs_mount+0xc6/0xaa0 fs/9p/vfs_super.c:122
legacy_get_tree+0x109/0x220 fs/fs_context.c:662
vfs_get_tree+0x8f/0x380 fs/super.c:1789
do_new_mount fs/namespace.c:3472 [inline]
path_mount+0x6e1/0x1f10 fs/namespace.c:3799
do_mount fs/namespace.c:3812 [inline]
__do_sys_mount fs/namespace.c:4020 [inline]
__se_sys_mount fs/namespace.c:3997 [inline]
__ia32_sys_mount+0x292/0x310 fs/namespace.c:3997
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
Freed by task 9462:
kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:579
poison_slab_object+0xf7/0x160 mm/kasan/common.c:240
__kasan_slab_free+0x32/0x50 mm/kasan/common.c:256
kasan_slab_free include/linux/kasan.h:184 [inline]
slab_free_hook mm/slub.c:2235 [inline]
slab_free mm/slub.c:4464 [inline]
kfree+0x12a/0x3b0 mm/slub.c:4585
p9_client_create+0x9ca/0x11b0 net/9p/client.c:1054
v9fs_session_init+0x1f8/0x1a80 fs/9p/v9fs.c:410
v9fs_mount+0xc6/0xaa0 fs/9p/vfs_super.c:122
legacy_get_tree+0x109/0x220 fs/fs_context.c:662
vfs_get_tree+0x8f/0x380 fs/super.c:1789
do_new_mount fs/namespace.c:3472 [inline]
path_mount+0x6e1/0x1f10 fs/namespace.c:3799
do_mount fs/namespace.c:3812 [inline]
__do_sys_mount fs/namespace.c:4020 [inline]
__se_sys_mount fs/namespace.c:3997 [inline]
__ia32_sys_mount+0x292/0x310 fs/namespace.c:3997
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x73/0x120 arch/x86/entry/common.c:386
do_fast_syscall_32+0x32/0x80 arch/x86/entry/common.c:411
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
The buggy address belongs to the object at ffff8880577fd400
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
freed 512-byte region [ffff8880577fd400, ffff8880577fd600)
The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x577fc
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff)
page_type: 0xffffefff(slab)
raw: 04fff00000000040 ffff888015442c80 dead000000000100 dead000000000122
raw: 0000000000000000 0000000080100010 00000001ffffefff 0000000000000000
head: 04fff00000000040 ffff888015442c80 dead000000000100 dead000000000122
head: 0000000000000000 0000000080100010 00000001ffffefff 0000000000000000
head: 04fff00000000002 ffffea00015dff01 ffffffffffffffff 0000000000000000
head: 0000000000000004 0000000000000000 00000000ffffffff 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 5230, tgid 5230 (syz-executor), ts 68725007623, free_ts 68298298589
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1473
prep_new_page mm/page_alloc.c:1481 [inline]
get_page_from_freelist+0x1353/0x2e50 mm/page_alloc.c:3425
__alloc_pages_noprof+0x22b/0x2460 mm/page_alloc.c:4683
__alloc_pages_node_noprof include/linux/gfp.h:269 [inline]
alloc_pages_node_noprof include/linux/gfp.h:296 [inline]
alloc_slab_page+0x56/0x110 mm/slub.c:2304
allocate_slab mm/slub.c:2467 [inline]
new_slab+0x84/0x260 mm/slub.c:2520
___slab_alloc+0xdac/0x1870 mm/slub.c:3706
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3796
__slab_alloc_node mm/slub.c:3849 [inline]
slab_alloc_node mm/slub.c:4016 [inline]
__do_kmalloc_node mm/slub.c:4148 [inline]
__kmalloc_noprof+0x379/0x410 mm/slub.c:4161
kmalloc_noprof include/linux/slab.h:685 [inline]
kzalloc_noprof include/linux/slab.h:807 [inline]
fib6_info_alloc+0x40/0x160 net/ipv6/ip6_fib.c:155
ip6_route_info_create+0x337/0x1ad0 net/ipv6/route.c:3761
addrconf_f6i_alloc+0x393/0x670 net/ipv6/route.c:4588
ipv6_add_addr+0x538/0x2090 net/ipv6/addrconf.c:1120
add_addr+0xe0/0x350 net/ipv6/addrconf.c:3202
add_v4_addrs+0x71a/0xa00 net/ipv6/addrconf.c:3267
addrconf_gre_config net/ipv6/addrconf.c:3544 [inline]
addrconf_init_auto_addrs+0x18a/0x820 net/ipv6/addrconf.c:3562
addrconf_notify+0xe9e/0x19e0 net/ipv6/addrconf.c:3743
page last free pid 5218 tgid 5218 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1093 [inline]
free_unref_page+0x64a/0xe40 mm/page_alloc.c:2588
__put_partials+0x14c/0x170 mm/slub.c:3034
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x4e/0x140 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x192/0x1e0 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:322
kasan_slab_alloc include/linux/kasan.h:201 [inline]
slab_post_alloc_hook mm/slub.c:3979 [inline]
slab_alloc_node mm/slub.c:4028 [inline]
kmem_cache_alloc_node_noprof+0x153/0x310 mm/slub.c:4071
__alloc_skb+0x2b3/0x380 net/core/skbuff.c:664
alloc_skb include/linux/skbuff.h:1320 [inline]
nlmsg_new include/net/netlink.h:1015 [inline]
rtmsg_ifinfo_build_skb+0x81/0x280 net/core/rtnetlink.c:4070
rtmsg_ifinfo_event net/core/rtnetlink.c:4113 [inline]
rtmsg_ifinfo_event net/core/rtnetlink.c:4103 [inline]
rtnetlink_event+0xf3/0x1f0 net/core/rtnetlink.c:6698
notifier_call_chain+0xb9/0x410 kernel/notifier.c:93
call_netdevice_notifiers_info+0xbe/0x140 net/core/dev.c:1994
call_netdevice_notifiers_extack net/core/dev.c:2032 [inline]
call_netdevice_notifiers net/core/dev.c:2046 [inline]
dev_change_name+0x495/0x9c0 net/core/dev.c:1266
do_setlink+0x2f04/0x3ea0 net/core/rtnetlink.c:2880
__rtnl_newlink+0xc3a/0x1960 net/core/rtnetlink.c:3696
rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3743
rtnetlink_rcv_msg+0x3c7/0xea0 net/core/rtnetlink.c:6647
Memory state around the buggy address:
ffff8880577fd300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff8880577fd380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880577fd400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff8880577fd480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff8880577fd500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 89 44 24 18 mov %eax,0x18(%rsp)
4: 48 89 6c 24 10 mov %rbp,0x10(%rsp)
9: 48 c7 c7 40 60 2b 8b mov $0xffffffff8b2b6040,%rdi
10: e8 6b 78 91 09 call 0x9917880
15: 65 66 c7 05 09 d3 b0 movw $0x0,%gs:0x7eb0d309(%rip) # 0x7eb0d328
1c: 7e 00 00
1f: e8 7c af 42 00 call 0x42afa0
24: fb sti
25: bb ff ff ff ff mov $0xffffffff,%ebx
* 2a: 49 c7 c6 c0 a0 80 8d mov $0xffffffff8d80a0c0,%r14 <-- trapping instruction
31: 41 0f bc dc bsf %r12d,%ebx
35: 83 c3 01 add $0x1,%ebx
38: 0f 85 a7 00 00 00 jne 0xe5
3e: e9 .byte 0xe9
3f: b4 .byte 0xb4