==================================================================
BUG: KASAN: slab-use-after-free in __lock_acquire+0x2da1/0x3b40 kernel/locking/lockdep.c:5005
Read of size 8 at addr ffff88804929d818 by task kswapd0/109
CPU: 0 PID: 109 Comm: kswapd0 Not tainted 6.8.0-rc7-syzkaller #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: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:lock_acquire+0x1ef/0x520 kernel/locking/lockdep.c:5722
Code: c1 05 8d ff 96 7e 83 f8 01 0f 85 b8 02 00 00 9c 58 f6 c4 02 0f 85 a3 02 00 00 48 85 ed 74 01 fb 48 b8 00 00 00 00 00 fc ff df <48> 01 c3 48 c7 03 00 00 00 00 48 c7 43 08 00 00 00 00 48 8b 84 24
RSP: 0018:ffffc90001f0f678 EFLAGS: 00000206
RAX: dffffc0000000000 RBX: 1ffff920003e1ed1 RCX: 000000006a0dfd38
RDX: 0000000000000001 RSI: ffffffff8aecb300 RDI: ffffffff8b4dbe40
RBP: 0000000000000200 R08: 0000000000000000 R09: fffffbfff27553f8
R10: ffffffff93aa9fc7 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: ffffffff8d5ad720 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
rcu_read_lock include/linux/rcupdate.h:750 [inline]
add_nr_deferred_memcg mm/shrinker.c:273 [inline]
add_nr_deferred mm/shrinker.c:361 [inline]
do_shrink_slab+0x922/0x1120 mm/shrinker.c:460
shrink_slab_memcg mm/shrinker.c:548 [inline]
shrink_slab+0xa87/0x1310 mm/shrinker.c:626
shrink_one+0x493/0x7b0 mm/vmscan.c:4767
shrink_many mm/vmscan.c:4828 [inline]
lru_gen_shrink_node mm/vmscan.c:4929 [inline]
shrink_node+0x21d0/0x3790 mm/vmscan.c:5888
kswapd_shrink_node mm/vmscan.c:6693 [inline]
balance_pgdat+0x9d2/0x1a90 mm/vmscan.c:6883
kswapd+0x5be/0xc00 mm/vmscan.c:7143
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 26782:
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/0x11b0 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+0x6e2/0x1f10 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]
__ia32_sys_mount+0x295/0x320 fs/namespace.c:3875
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x7c/0x120 arch/x86/entry/common.c:321
do_fast_syscall_32+0x33/0x80 arch/x86/entry/common.c:346
entry_SYSENTER_compat_after_hwframe+0x7c/0x86
Freed by task 26782:
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+0x9cb/0x11b0 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+0x6e2/0x1f10 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]
__ia32_sys_mount+0x295/0x320 fs/namespace.c:3875
do_syscall_32_irqs_on arch/x86/entry/common.c:165 [inline]
__do_fast_syscall_32+0x7c/0x120 arch/x86/entry/common.c:321
do_fast_syscall_32+0x33/0x80 arch/x86/entry/common.c:346
entry_SYSENTER_compat_after_hwframe+0x7c/0x86
The buggy address belongs to the object at ffff88804929d800
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
freed 512-byte region [ffff88804929d800, ffff88804929da00)
The buggy address belongs to the physical page:
page:ffffea000124a700 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4929c
head:ffffea000124a700 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 ffff888014c42c80 ffffea00012bae00 dead000000000002
raw: 0000000000000000 0000000080100010 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 0x152820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 26234, tgid 26230 (syz-executor.1), ts 881386794783, free_ts 875757796448
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+0x4b0/0x1780 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+0x337/0x1af0 net/ipv6/route.c:3749
ip6_route_add+0x26/0x150 net/ipv6/route.c:3843
addrconf_prefix_route+0x2fe/0x510 net/ipv6/addrconf.c:2452
addrconf_add_linklocal+0x31d/0x640 net/ipv6/addrconf.c:3273
addrconf_addr_gen+0x37b/0x3d0 net/ipv6/addrconf.c:3402
addrconf_dev_config net/ipv6/addrconf.c:3447 [inline]
addrconf_init_auto_addrs+0x446/0x820 net/ipv6/addrconf.c:3525
addrconf_notify+0xe2d/0x18f0 net/ipv6/addrconf.c:3698
notifier_call_chain+0xb9/0x3c0 kernel/notifier.c:93
page last free pid 25982 tgid 25979 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
__folio_put_small mm/swap.c:106 [inline]
__folio_put+0xc3/0x110 mm/swap.c:129
folio_put include/linux/mm.h:1494 [inline]
put_page include/linux/mm.h:1563 [inline]
free_page_and_swap_cache+0x25a/0x2d0 mm/swap_state.c:304
__tlb_remove_table arch/x86/include/asm/tlb.h:34 [inline]
__tlb_remove_table_free mm/mmu_gather.c:154 [inline]
tlb_remove_table_rcu+0x89/0xe0 mm/mmu_gather.c:209
rcu_do_batch kernel/rcu/tree.c:2190 [inline]
rcu_core+0x819/0x1680 kernel/rcu/tree.c:2465
__do_softirq+0x21c/0x8e7 kernel/softirq.c:553
Memory state around the buggy address:
ffff88804929d700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88804929d780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88804929d800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88804929d880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88804929d900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: c1 05 8d ff 96 7e 83 roll $0x83,0x7e96ff8d(%rip) # 0x7e96ff94
7: f8 clc
8: 01 0f add %ecx,(%rdi)
a: 85 b8 02 00 00 9c test %edi,-0x63fffffe(%rax)
10: 58 pop %rax
11: f6 c4 02 test $0x2,%ah
14: 0f 85 a3 02 00 00 jne 0x2bd
1a: 48 85 ed test %rbp,%rbp
1d: 74 01 je 0x20
1f: fb sti
20: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax
27: fc ff df
* 2a: 48 01 c3 add %rax,%rbx <-- trapping instruction
2d: 48 c7 03 00 00 00 00 movq $0x0,(%rbx)
34: 48 c7 43 08 00 00 00 movq $0x0,0x8(%rbx)
3b: 00
3c: 48 rex.W
3d: 8b .byte 0x8b
3e: 84 .byte 0x84
3f: 24 .byte 0x24