==================================================================
BUG: KASAN: slab-use-after-free in __lock_acquire+0x2da1/0x3b40 kernel/locking/lockdep.c:5005
Read of size 8 at addr ffff888020e07818 by task kworker/u16:6/11518
CPU: 3 PID: 11518 Comm: kworker/u16:6 Not tainted 6.8.0-rc6-syzkaller-00120-g87adedeba51a #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: events_unbound bpf_map_free_deferred
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:377 [inline]
print_report+0xc4/0x620 mm/kasan/report.c:488
kasan_report+0xda/0x110 mm/kasan/report.c:601
__lock_acquire+0x2da1/0x3b40 kernel/locking/lockdep.c:5005
lock_acquire kernel/locking/lockdep.c:5754 [inline]
lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5719
__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:394 [inline]
p9_req_put net/9p/client.c:402 [inline]
p9_req_put+0xca/0x250 net/9p/client.c:399
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+0x22a/0x750 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:161 [inline]
handle_irq arch/x86/kernel/irq.c:238 [inline]
__common_interrupt+0xde/0x250 arch/x86/kernel/irq.c:257
common_interrupt+0xab/0xd0 arch/x86/kernel/irq.c:247
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:640
RIP: 0010:csd_lock_wait kernel/smp.c:311 [inline]
RIP: 0010:smp_call_function_single+0x1f0/0x650 kernel/smp.c:650
Code: de 89 fa c1 e2 10 09 d0 89 84 24 8c 00 00 00 e8 86 fa ff ff 41 89 c5 0f 1f 44 00 00 e8 49 e8 0b 00 eb 07 e8 42 e8 0b 00 f3 90 <8b> 9c 24 88 00 00 00 31 ff 83 e3 01 89 de e8 0d e3 0b 00 85 db 75
RSP: 0018:ffffc9000422faa0 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff817f6643
RDX: ffff88801ced2400 RSI: ffffffff817f662e RDI: 0000000000000005
RBP: ffffc9000422fbc0 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000003 R12: 1ffff92000845f58
R13: 0000000000000000 R14: 0000000000000001 R15: ffff88806b43db80
rcu_barrier+0x284/0x6c0 kernel/rcu/tree.c:4116
dev_map_free+0x131/0x780 kernel/bpf/devmap.c:202
bpf_map_free_deferred+0x1bc/0x400 kernel/bpf/syscall.c:700
process_one_work+0x889/0x15e0 kernel/workqueue.c:2633
process_scheduled_works kernel/workqueue.c:2706 [inline]
worker_thread+0x8b9/0x12a0 kernel/workqueue.c:2787
kthread+0x2c6/0x3b0 kernel/kthread.c:388
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
Allocated by task 23338:
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 include/linux/slab.h:590 [inline]
p9_client_create+0xcf/0x1220 net/9p/client.c:980
v9fs_session_init+0x1f8/0x1a80 fs/9p/v9fs.c:410
v9fs_mount+0xc6/0xcd0 fs/9p/vfs_super.c:123
legacy_get_tree+0x109/0x220 fs/fs_context.c:662
vfs_get_tree+0x8f/0x380 fs/super.c:1779
do_new_mount fs/namespace.c:3352 [inline]
path_mount+0x14ea/0x1f20 fs/namespace.c:3679
do_mount fs/namespace.c:3692 [inline]
__do_sys_mount fs/namespace.c:3898 [inline]
__se_sys_mount fs/namespace.c:3875 [inline]
__x64_sys_mount+0x297/0x320 fs/namespace.c:3875
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x6f/0x77
Freed by task 23338:
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:589
poison_slab_object mm/kasan/common.c:240 [inline]
__kasan_slab_free+0x11d/0x1a0 mm/kasan/common.c:256
kasan_slab_free include/linux/kasan.h:184 [inline]
slab_free_hook mm/slub.c:2121 [inline]
slab_free mm/slub.c:4299 [inline]
kfree+0x124/0x370 mm/slub.c:4409
p9_client_create+0xa1f/0x1220 net/9p/client.c:1051
v9fs_session_init+0x1f8/0x1a80 fs/9p/v9fs.c:410
v9fs_mount+0xc6/0xcd0 fs/9p/vfs_super.c:123
legacy_get_tree+0x109/0x220 fs/fs_context.c:662
vfs_get_tree+0x8f/0x380 fs/super.c:1779
do_new_mount fs/namespace.c:3352 [inline]
path_mount+0x14ea/0x1f20 fs/namespace.c:3679
do_mount fs/namespace.c:3692 [inline]
__do_sys_mount fs/namespace.c:3898 [inline]
__se_sys_mount fs/namespace.c:3875 [inline]
__x64_sys_mount+0x297/0x320 fs/namespace.c:3875
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd5/0x270 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x6f/0x77
The buggy address belongs to the object at ffff888020e07800
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
freed 512-byte region [ffff888020e07800, ffff888020e07a00)
The buggy address belongs to the physical page:
page:ffffea0000838100 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x20e04
head:ffffea0000838100 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 ffff888014c42c80 dead000000000100 dead000000000122
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 5201, tgid 5201 (syz-executor.3), ts 111801130350, free_ts 111620275064
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x2d4/0x350 mm/page_alloc.c:1533
prep_new_page mm/page_alloc.c:1540 [inline]
get_page_from_freelist+0xa28/0x3780 mm/page_alloc.c:3311
__alloc_pages+0x22f/0x2440 mm/page_alloc.c:4567
__alloc_pages_node include/linux/gfp.h:238 [inline]
alloc_pages_node include/linux/gfp.h:261 [inline]
alloc_slab_page mm/slub.c:2190 [inline]
allocate_slab mm/slub.c:2354 [inline]
new_slab+0xcc/0x3a0 mm/slub.c:2407
___slab_alloc+0x4af/0x19a0 mm/slub.c:3540
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3625
__slab_alloc_node mm/slub.c:3678 [inline]
slab_alloc_node mm/slub.c:3850 [inline]
__do_kmalloc_node mm/slub.c:3980 [inline]
__kmalloc+0x3b8/0x440 mm/slub.c:3994
kmalloc include/linux/slab.h:594 [inline]
kzalloc include/linux/slab.h:711 [inline]
fib6_info_alloc+0x40/0x100 net/ipv6/ip6_fib.c:155
ip6_route_info_create+0x337/0x1b70 net/ipv6/route.c:3749
addrconf_f6i_alloc+0x393/0x660 net/ipv6/route.c:4572
ipv6_add_addr+0x538/0x2030 net/ipv6/addrconf.c:1131
inet6_addr_add+0x3bb/0xbe0 net/ipv6/addrconf.c:3016
inet6_rtm_newaddr+0x11de/0x1ab0 net/ipv6/addrconf.c:4991
rtnetlink_rcv_msg+0x3c7/0xe10 net/core/rtnetlink.c:6617
netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2543
netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]
netlink_unicast+0x542/0x820 net/netlink/af_netlink.c:1367
page last free pid 45 tgid 45 stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1140 [inline]
free_unref_page_prepare+0x527/0xb10 mm/page_alloc.c:2346
free_unref_page+0x33/0x3c0 mm/page_alloc.c:2486
stack_depot_save_flags+0x2da/0x900 lib/stackdepot.c:714
kasan_save_stack+0x42/0x60 mm/kasan/common.c:48
kasan_save_track+0x14/0x30 mm/kasan/common.c:68
kasan_save_free_info+0x3b/0x60 mm/kasan/generic.c:589
poison_slab_object mm/kasan/common.c:240 [inline]
__kasan_slab_free+0x11d/0x1a0 mm/kasan/common.c:256
kasan_slab_free include/linux/kasan.h:184 [inline]
slab_free_hook mm/slub.c:2121 [inline]
slab_free mm/slub.c:4299 [inline]
kmem_cache_free+0x129/0x360 mm/slub.c:4363
skb_kfree_head net/core/skbuff.c:984 [inline]
skb_kfree_head net/core/skbuff.c:981 [inline]
skb_free_head+0x17f/0x1b0 net/core/skbuff.c:998
skb_release_data+0x5c0/0x880 net/core/skbuff.c:1028
skb_release_all net/core/skbuff.c:1094 [inline]
__kfree_skb net/core/skbuff.c:1108 [inline]
consume_skb net/core/skbuff.c:1324 [inline]
consume_skb+0xd2/0x170 net/core/skbuff.c:1318
nlmon_xmit+0xa5/0xe0 drivers/net/nlmon.c:15
__netdev_start_xmit include/linux/netdevice.h:4980 [inline]
netdev_start_xmit include/linux/netdevice.h:4994 [inline]
xmit_one net/core/dev.c:3547 [inline]
dev_hard_start_xmit+0x13a/0x6d0 net/core/dev.c:3563
__dev_queue_xmit+0x7b6/0x3ee0 net/core/dev.c:4351
neigh_output include/net/neighbour.h:542 [inline]
ip6_finish_output2+0x673/0x1830 net/ipv6/ip6_output.c:137
__ip6_finish_output net/ipv6/ip6_output.c:211 [inline]
ip6_finish_output+0x3f9/0x1300 net/ipv6/ip6_output.c:222
Memory state around the buggy address:
ffff888020e07700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888020e07780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888020e07800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888020e07880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888020e07900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: de 89 fa c1 e2 10 fimuls 0x10e2c1fa(%rcx)
6: 09 d0 or %edx,%eax
8: 89 84 24 8c 00 00 00 mov %eax,0x8c(%rsp)
f: e8 86 fa ff ff call 0xfffffa9a
14: 41 89 c5 mov %eax,%r13d
17: 0f 1f 44 00 00 nopl 0x0(%rax,%rax,1)
1c: e8 49 e8 0b 00 call 0xbe86a
21: eb 07 jmp 0x2a
23: e8 42 e8 0b 00 call 0xbe86a
28: f3 90 pause
* 2a: 8b 9c 24 88 00 00 00 mov 0x88(%rsp),%ebx <-- trapping instruction
31: 31 ff xor %edi,%edi
33: 83 e3 01 and $0x1,%ebx
36: 89 de mov %ebx,%esi
38: e8 0d e3 0b 00 call 0xbe34a
3d: 85 db test %ebx,%ebx
3f: 75 .byte 0x75