==================================================================
BUG: KASAN: slab-use-after-free in __lock_acquire+0x4208/0x5de0 kernel/locking/lockdep.c:5004
Read of size 8 at addr ffff888050147018 by task syz-executor.3/5189
CPU: 1 PID: 5189 Comm: syz-executor.3 Not tainted 6.6.0-rc2-syzkaller-00244-g27bbf45eae9c #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
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:364 [inline]
print_report+0xc4/0x620 mm/kasan/report.c:475
kasan_report+0xda/0x110 mm/kasan/report.c:588
__lock_acquire+0x4208/0x5de0 kernel/locking/lockdep.c:5004
lock_acquire kernel/locking/lockdep.c:5753 [inline]
lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5718
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
_raw_spin_lock_irqsave+0x3a/0x50 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+0xc6/0x250 net/9p/client.c:399
req_done+0x1e7/0x2e0 net/9p/trans_virtio.c:147
vring_interrupt drivers/virtio/virtio_ring.c:2595 [inline]
vring_interrupt+0x317/0x3f0 drivers/virtio/virtio_ring.c:2570
__handle_irq_event_percpu+0x22a/0x740 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+0x261/0xcf0 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+0xdb/0x240 arch/x86/kernel/irq.c:257
common_interrupt+0xa9/0xd0 arch/x86/kernel/irq.c:247
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636
RIP: 0010:arch_atomic_add_return arch/x86/include/asm/atomic.h:85 [inline]
RIP: 0010:raw_atomic_add_return include/linux/atomic/atomic-arch-fallback.h:555 [inline]
RIP: 0010:raw_atomic_inc_return include/linux/atomic/atomic-arch-fallback.h:1011 [inline]
RIP: 0010:atomic_inc_return include/linux/atomic/atomic-instrumented.h:454 [inline]
RIP: 0010:page_table_check_set mm/page_table_check.c:122 [inline]
RIP: 0010:page_table_check_set+0x4f5/0x9a0 mm/page_table_check.c:97
Code: ff 8b 44 24 08 85 c0 0f 85 35 02 00 00 e8 53 96 9f ff 48 8d 7b 04 be 04 00 00 00 e8 f5 4f f5 ff b8 01 00 00 00 f0 0f c1 43 04 <8d> 58 01 31 ff 89 de e8 9f 91 9f ff 85 db 0f 89 1f ff ff ff e8 22
RSP: 0018:ffffc90003eef5e0 EFLAGS: 00000206
RAX: 0000000000000005 RBX: ffff888041c8ddf0 RCX: ffffffff81e82eab
RDX: ffffed1008391bbf RSI: 0000000000000004 RDI: ffff888041c8ddf4
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1008391bbe
R10: ffff888041c8ddf7 R11: dffffc0000000000 R12: ffff888041c8ddb0
R13: 0000000000000001 R14: 0000000000000000 R15: dffffc0000000000
__page_table_check_ptes_set+0x1cc/0x220 mm/page_table_check.c:196
page_table_check_ptes_set include/linux/page_table_check.h:74 [inline]
set_ptes include/linux/pgtable.h:226 [inline]
copy_present_pte mm/memory.c:978 [inline]
copy_pte_range mm/memory.c:1082 [inline]
copy_pmd_range mm/memory.c:1167 [inline]
copy_pud_range mm/memory.c:1204 [inline]
copy_p4d_range mm/memory.c:1228 [inline]
copy_page_range+0x1512/0x3e10 mm/memory.c:1326
dup_mmap+0x13f3/0x1d80 kernel/fork.c:758
dup_mm kernel/fork.c:1686 [inline]
copy_mm kernel/fork.c:1735 [inline]
copy_process+0x6bff/0x73f0 kernel/fork.c:2501
kernel_clone+0xfd/0x920 kernel/fork.c:2909
__do_compat_sys_ia32_clone+0xb7/0xf0 arch/x86/kernel/sys_ia32.c:254
do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
__do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:178
do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
entry_SYSENTER_compat_after_hwframe+0x70/0x82
RIP: 0023:0xf7f2d579
Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000ffdb341c EFLAGS: 00000292 ORIG_RAX: 0000000000000078
RAX: ffffffffffffffda RBX: 0000000001200011 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000056ba5468
RBP: 00000000f7353ff4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Allocated by task 15178:
kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:374 [inline]
__kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383
kmalloc include/linux/slab.h:599 [inline]
p9_client_create+0xcf/0x1210 net/9p/client.c:978
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:638
vfs_get_tree+0x8c/0x370 fs/super.c:1750
do_new_mount fs/namespace.c:3335 [inline]
path_mount+0x1492/0x1ed0 fs/namespace.c:3662
do_mount fs/namespace.c:3675 [inline]
__do_sys_mount fs/namespace.c:3884 [inline]
__se_sys_mount fs/namespace.c:3861 [inline]
__ia32_sys_mount+0x291/0x310 fs/namespace.c:3861
do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
__do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:178
do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
entry_SYSENTER_compat_after_hwframe+0x70/0x82
Freed by task 15178:
kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:522
____kasan_slab_free mm/kasan/common.c:236 [inline]
____kasan_slab_free+0x15b/0x1b0 mm/kasan/common.c:200
kasan_slab_free include/linux/kasan.h:164 [inline]
slab_free_hook mm/slub.c:1800 [inline]
slab_free_freelist_hook+0x114/0x1e0 mm/slub.c:1826
slab_free mm/slub.c:3809 [inline]
__kmem_cache_free+0xb8/0x2f0 mm/slub.c:3822
p9_client_create+0xa14/0x1210 net/9p/client.c:1049
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:638
vfs_get_tree+0x8c/0x370 fs/super.c:1750
do_new_mount fs/namespace.c:3335 [inline]
path_mount+0x1492/0x1ed0 fs/namespace.c:3662
do_mount fs/namespace.c:3675 [inline]
__do_sys_mount fs/namespace.c:3884 [inline]
__se_sys_mount fs/namespace.c:3861 [inline]
__ia32_sys_mount+0x291/0x310 fs/namespace.c:3861
do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
__do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:178
do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
entry_SYSENTER_compat_after_hwframe+0x70/0x82
Last potentially related work creation:
kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
__kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:492
insert_work+0x38/0x230 kernel/workqueue.c:1647
__queue_work+0x5d0/0x1050 kernel/workqueue.c:1799
call_timer_fn+0x19e/0x580 kernel/time/timer.c:1700
expire_timers kernel/time/timer.c:1746 [inline]
__run_timers+0x585/0xb10 kernel/time/timer.c:2022
run_timer_softirq+0x58/0xd0 kernel/time/timer.c:2035
__do_softirq+0x218/0x965 kernel/softirq.c:553
Second to last potentially related work creation:
kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
__kasan_record_aux_stack+0xbc/0xd0 mm/kasan/generic.c:492
__call_rcu_common.constprop.0+0x9a/0x790 kernel/rcu/tree.c:2653
fib6_info_release include/net/ip6_fib.h:332 [inline]
fib6_info_release include/net/ip6_fib.h:329 [inline]
__ip6_del_rt net/ipv6/route.c:3870 [inline]
ip6_del_rt+0x1c2/0x200 net/ipv6/route.c:3881
__ipv6_ifa_notify+0x431/0x11d0 net/ipv6/addrconf.c:6232
addrconf_ifdown.isra.0+0xeed/0x1c50 net/ipv6/addrconf.c:3916
addrconf_notify+0x22d/0x1920 net/ipv6/addrconf.c:3715
notifier_call_chain+0xb6/0x3b0 kernel/notifier.c:93
call_netdevice_notifiers_info+0xb9/0x130 net/core/dev.c:1970
call_netdevice_notifiers_extack net/core/dev.c:2008 [inline]
call_netdevice_notifiers net/core/dev.c:2022 [inline]
dev_close_many+0x305/0x640 net/core/dev.c:1563
unregister_netdevice_many_notify+0x41b/0x1a20 net/core/dev.c:10911
unregister_netdevice_many net/core/dev.c:10994 [inline]
unregister_netdevice_queue+0x2e5/0x3c0 net/core/dev.c:10874
unregister_netdevice include/linux/netdevice.h:3106 [inline]
__tun_detach+0x116f/0x1470 drivers/net/tun.c:684
tun_detach drivers/net/tun.c:700 [inline]
tun_chr_close+0xc8/0x240 drivers/net/tun.c:3496
__fput+0x3f7/0xa70 fs/file_table.c:384
__fput_sync+0x47/0x50 fs/file_table.c:465
__do_sys_close fs/open.c:1572 [inline]
__se_sys_close fs/open.c:1557 [inline]
__ia32_sys_close+0x87/0xf0 fs/open.c:1557
do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
__do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:178
do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203
entry_SYSENTER_compat_after_hwframe+0x70/0x82
The buggy address belongs to the object at ffff888050147000
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
freed 512-byte region [ffff888050147000, ffff888050147200)
The buggy address belongs to the physical page:
page:ffffea0001405100 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff888050145400 pfn:0x50144
head:ffffea0001405100 order:2 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x4fff00000000840(slab|head|node=1|zone=1|lastcpupid=0x7ff)
page_type: 0xffffffff()
raw: 04fff00000000840 ffff888012c42c80 ffff8880400007c8 ffffea000148b110
raw: ffff888050145400 000000000010000f 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 0x52820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP), pid 33, tgid 33 (kworker/3:0), ts 147754732726, free_ts 147713198998
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x2cf/0x340 mm/page_alloc.c:1536
prep_new_page mm/page_alloc.c:1543 [inline]
get_page_from_freelist+0xee0/0x2f20 mm/page_alloc.c:3170
__alloc_pages+0x1d0/0x4a0 mm/page_alloc.c:4426
alloc_pages+0x1a9/0x270 mm/mempolicy.c:2298
alloc_slab_page mm/slub.c:1870 [inline]
allocate_slab+0x251/0x380 mm/slub.c:2017
new_slab mm/slub.c:2070 [inline]
___slab_alloc+0x8c7/0x1580 mm/slub.c:3223
__slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3322
__slab_alloc_node mm/slub.c:3375 [inline]
slab_alloc_node mm/slub.c:3468 [inline]
__kmem_cache_alloc_node+0x131/0x340 mm/slub.c:3517
__do_kmalloc_node mm/slab_common.c:1022 [inline]
__kmalloc+0x4f/0x100 mm/slab_common.c:1036
kmalloc include/linux/slab.h:603 [inline]
kzalloc include/linux/slab.h:720 [inline]
neigh_hash_alloc+0x1a5/0x210 net/core/neighbour.c:534
neigh_hash_grow net/core/neighbour.c:579 [inline]
___neigh_create+0x19d4/0x2a50 net/core/neighbour.c:679
ip6_finish_output2+0x10b5/0x1700 net/ipv6/ip6_output.c:126
__ip6_finish_output net/ipv6/ip6_output.c:196 [inline]
ip6_finish_output+0x485/0x1250 net/ipv6/ip6_output.c:207
NF_HOOK_COND include/linux/netfilter.h:293 [inline]
ip6_output+0x1e2/0x530 net/ipv6/ip6_output.c:228
dst_output include/net/dst.h:458 [inline]
NF_HOOK.constprop.0+0xff/0x570 include/linux/netfilter.h:304
mld_sendpack+0x713/0xd60 net/ipv6/mcast.c:1818
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1136 [inline]
free_unref_page_prepare+0x476/0xa40 mm/page_alloc.c:2312
free_unref_page+0x33/0x3b0 mm/page_alloc.c:2405
__stack_depot_save+0x193/0x510 lib/stackdepot.c:443
kasan_save_stack+0x43/0x50 mm/kasan/common.c:46
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:374 [inline]
__kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:383
kasan_kmalloc include/linux/kasan.h:198 [inline]
__do_kmalloc_node mm/slab_common.c:1023 [inline]
__kmalloc_node_track_caller+0x61/0x100 mm/slab_common.c:1043
kmalloc_reserve+0xef/0x260 net/core/skbuff.c:581
__alloc_skb+0x12b/0x330 net/core/skbuff.c:650
alloc_skb include/linux/skbuff.h:1286 [inline]
nlmsg_new include/net/netlink.h:999 [inline]
inet6_rt_notify+0xf0/0x2b0 net/ipv6/route.c:6171
fib6_add_rt2node net/ipv6/ip6_fib.c:1257 [inline]
fib6_add+0x24f7/0x4700 net/ipv6/ip6_fib.c:1483
__ip6_ins_rt net/ipv6/route.c:1303 [inline]
ip6_route_add+0x8d/0x150 net/ipv6/route.c:3847
addrconf_prefix_route+0x2f9/0x510 net/ipv6/addrconf.c:2434
add_v4_addrs+0x6be/0x9d0 net/ipv6/addrconf.c:3206
addrconf_sit_config net/ipv6/addrconf.c:3455 [inline]
addrconf_init_auto_addrs+0x4ea/0x810 net/ipv6/addrconf.c:3492
addrconf_notify+0xe65/0x1920 net/ipv6/addrconf.c:3679
Memory state around the buggy address:
ffff888050146f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888050146f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888050147000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888050147080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888050147100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: ff 8b 44 24 08 85 decl -0x7af7dbbc(%rbx)
6: c0 0f 85 rorb $0x85,(%rdi)
9: 35 02 00 00 e8 xor $0xe8000002,%eax
e: 53 push %rbx
f: 96 xchg %eax,%esi
10: 9f lahf
11: ff 48 8d decl -0x73(%rax)
14: 7b 04 jnp 0x1a
16: be 04 00 00 00 mov $0x4,%esi
1b: e8 f5 4f f5 ff call 0xfff55015
20: b8 01 00 00 00 mov $0x1,%eax
25: f0 0f c1 43 04 lock xadd %eax,0x4(%rbx)
* 2a: 8d 58 01 lea 0x1(%rax),%ebx <-- trapping instruction
2d: 31 ff xor %edi,%edi
2f: 89 de mov %ebx,%esi
31: e8 9f 91 9f ff call 0xff9f91d5
36: 85 db test %ebx,%ebx
38: 0f 89 1f ff ff ff jns 0xffffff5d
3e: e8 .byte 0xe8
3f: 22 .byte 0x22