==================================================================
BUG: KASAN: slab-use-after-free in __lock_acquire+0x2d85/0x3b20 kernel/locking/lockdep.c:5005
Read of size 8 at addr ffff88801b458c18 by task swapper/3/0
CPU: 3 PID: 0 Comm: swapper/3 Not tainted 6.7.0-rc4-syzkaller-00009-gbee0e7762ad2 #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+0x2d85/0x3b20 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/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/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+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+0xab/0xd0 arch/x86/kernel/irq.c:247
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:636
RIP: 0010:native_irq_disable arch/x86/include/asm/irqflags.h:37 [inline]
RIP: 0010:arch_local_irq_disable arch/x86/include/asm/irqflags.h:72 [inline]
RIP: 0010:default_idle+0xf/0x20 arch/x86/kernel/process.c:743
Code: 89 07 49 c7 c0 08 00 00 00 4d 29 c8 4c 01 c7 4c 29 c2 e9 76 ff ff ff cc cc cc cc f3 0f 1e fa 66 90 0f 00 2d 53 5a 47 00 fb f4 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 f3 0f 1e fa 65
RSP: 0018:ffffc90000397e08 EFLAGS: 00000246
RAX: 00000000001378ff RBX: 0000000000000003 RCX: ffffffff8a7f3a57
RDX: 0000000000000000 RSI: ffffffff8acca860 RDI: ffffffff8b2ee4a0
RBP: ffffed1002ad9898 R08: 0000000000000001 R09: ffffed100d726dbd
R10: ffff88806b936deb R11: 0000000000000000 R12: 0000000000000003
R13: ffff8880156cc4c0 R14: ffffffff8f186f90 R15: 0000000000000000
default_idle_call+0x69/0xa0 kernel/sched/idle.c:97
cpuidle_idle_call kernel/sched/idle.c:170 [inline]
do_idle+0x332/0x400 kernel/sched/idle.c:282
cpu_startup_entry+0x50/0x60 kernel/sched/idle.c:380
start_secondary+0x20e/0x2a0 arch/x86/kernel/smpboot.c:336
secondary_startup_64_no_verify+0x166/0x16b
Allocated by task 7778:
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+0xa3/0xb0 mm/kasan/common.c:383
kmalloc include/linux/slab.h:600 [inline]
p9_client_create+0xcf/0x1210 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+0x8c/0x370 fs/super.c:1771
do_new_mount fs/namespace.c:3337 [inline]
path_mount+0x1492/0x1ed0 fs/namespace.c:3664
do_mount fs/namespace.c:3677 [inline]
__do_sys_mount fs/namespace.c:3886 [inline]
__se_sys_mount fs/namespace.c:3863 [inline]
__x64_sys_mount+0x293/0x310 fs/namespace.c:3863
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x63/0x6b
Freed by task 7778:
kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
kasan_save_free_info+0x28/0x40 mm/kasan/generic.c:522
____kasan_slab_free mm/kasan/common.c:236 [inline]
____kasan_slab_free+0x138/0x190 mm/kasan/common.c:200
kasan_slab_free include/linux/kasan.h:164 [inline]
__cache_free mm/slab.c:3370 [inline]
__do_kmem_cache_free mm/slab.c:3557 [inline]
__kmem_cache_free+0xcc/0x3d0 mm/slab.c:3564
p9_client_create+0xa14/0x1210 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+0x8c/0x370 fs/super.c:1771
do_new_mount fs/namespace.c:3337 [inline]
path_mount+0x1492/0x1ed0 fs/namespace.c:3664
do_mount fs/namespace.c:3677 [inline]
__do_sys_mount fs/namespace.c:3886 [inline]
__se_sys_mount fs/namespace.c:3863 [inline]
__x64_sys_mount+0x293/0x310 fs/namespace.c:3863
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x63/0x6b
Last potentially related work creation:
kasan_save_stack+0x33/0x50 mm/kasan/common.c:45
__kasan_record_aux_stack+0x78/0x80 mm/kasan/generic.c:492
__call_rcu_common.constprop.0+0x9a/0x7a0 kernel/rcu/tree.c:2681
fib6_info_release include/net/ip6_fib.h:332 [inline]
fib6_info_release include/net/ip6_fib.h:329 [inline]
ip6_route_info_create+0x199c/0x1e70 net/ipv6/route.c:3829
ip6_route_add+0x26/0x150 net/ipv6/route.c:3843
addrconf_add_mroute+0x1de/0x350 net/ipv6/addrconf.c:2509
addrconf_add_dev+0x150/0x1c0 net/ipv6/addrconf.c:2527
inet6_addr_add+0x1a8/0xbe0 net/ipv6/addrconf.c:2973
inet6_rtm_newaddr+0x11da/0x1ab0 net/ipv6/addrconf.c:4984
rtnetlink_rcv_msg+0x3c7/0xe00 net/core/rtnetlink.c:6558
netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2545
netlink_unicast_kernel net/netlink/af_netlink.c:1342 [inline]
netlink_unicast+0x53b/0x810 net/netlink/af_netlink.c:1368
netlink_sendmsg+0x93c/0xe40 net/netlink/af_netlink.c:1910
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg+0xd5/0x180 net/socket.c:745
__sys_sendto+0x255/0x340 net/socket.c:2190
__do_sys_sendto net/socket.c:2202 [inline]
__se_sys_sendto net/socket.c:2198 [inline]
__x64_sys_sendto+0xe0/0x1b0 net/socket.c:2198
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
entry_SYSCALL_64_after_hwframe+0x63/0x6b
The buggy address belongs to the object at ffff88801b458c00
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
freed 512-byte region [ffff88801b458c00, ffff88801b458e00)
The buggy address belongs to the physical page:
page:ffffea00006d1600 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88801b458800 pfn:0x1b458
flags: 0xfff00000000800(slab|node=0|zone=1|lastcpupid=0x7ff)
page_type: 0x2()
raw: 00fff00000000800 ffff888013040600 ffffea0000a312d0 ffffea0000871590
raw: ffff88801b458800 ffff88801b458000 0000000100000002 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x3420c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_COMP|__GFP_HARDWALL|__GFP_THISNODE), pid 5208, tgid 5208 (syz-executor.2), ts 161770086239, free_ts 159932551260
set_page_owner include/linux/page_owner.h:31 [inline]
post_alloc_hook+0x2d0/0x350 mm/page_alloc.c:1537
prep_new_page mm/page_alloc.c:1544 [inline]
get_page_from_freelist+0xa25/0x36d0 mm/page_alloc.c:3312
__alloc_pages+0x22e/0x2420 mm/page_alloc.c:4568
__alloc_pages_node include/linux/gfp.h:238 [inline]
kmem_getpages mm/slab.c:1356 [inline]
cache_grow_begin+0x99/0x3a0 mm/slab.c:2550
cache_alloc_refill+0x295/0x3b0 mm/slab.c:2923
____cache_alloc mm/slab.c:2999 [inline]
____cache_alloc mm/slab.c:2982 [inline]
__do_cache_alloc mm/slab.c:3182 [inline]
slab_alloc_node mm/slab.c:3230 [inline]
__kmem_cache_alloc_node+0x3ba/0x460 mm/slab.c:3521
__do_kmalloc_node mm/slab_common.c:1006 [inline]
__kmalloc+0x49/0x90 mm/slab_common.c:1020
kmalloc include/linux/slab.h:604 [inline]
kzalloc include/linux/slab.h:721 [inline]
fib6_info_alloc+0x40/0x160 net/ipv6/ip6_fib.c:155
ip6_route_info_create+0x337/0x1e70 net/ipv6/route.c:3749
ip6_route_add+0x26/0x150 net/ipv6/route.c:3843
addrconf_add_mroute+0x1de/0x350 net/ipv6/addrconf.c:2509
addrconf_add_dev+0x150/0x1c0 net/ipv6/addrconf.c:2527
inet6_addr_add+0x1a8/0xbe0 net/ipv6/addrconf.c:2973
inet6_rtm_newaddr+0x11da/0x1ab0 net/ipv6/addrconf.c:4984
rtnetlink_rcv_msg+0x3c7/0xe00 net/core/rtnetlink.c:6558
netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2545
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1137 [inline]
free_unref_page_prepare+0x4fa/0xaa0 mm/page_alloc.c:2347
free_unref_page+0x33/0x3b0 mm/page_alloc.c:2487
slab_destroy mm/slab.c:1608 [inline]
slabs_destroy+0x85/0xc0 mm/slab.c:1628
cache_flusharray mm/slab.c:3341 [inline]
___cache_free+0x2b7/0x420 mm/slab.c:3404
qlink_free mm/kasan/quarantine.c:168 [inline]
qlist_free_all+0x4c/0x1b0 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x18e/0x1d0 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0x65/0x90 mm/kasan/common.c:305
kasan_slab_alloc include/linux/kasan.h:188 [inline]
slab_post_alloc_hook mm/slab.h:763 [inline]
slab_alloc_node mm/slab.c:3237 [inline]
__kmem_cache_alloc_node+0x163/0x460 mm/slab.c:3521
kmalloc_trace+0x25/0x60 mm/slab_common.c:1098
kmalloc include/linux/slab.h:600 [inline]
kzalloc include/linux/slab.h:721 [inline]
ref_tracker_alloc+0x17c/0x5a0 lib/ref_tracker.c:203
__netdev_tracker_alloc include/linux/netdevice.h:4107 [inline]
netdev_hold include/linux/netdevice.h:4136 [inline]
netdev_hold include/linux/netdevice.h:4131 [inline]
rx_queue_add_kobject net/core/net-sysfs.c:1085 [inline]
net_rx_queue_update_kobjects+0x284/0x5e0 net/core/net-sysfs.c:1143
register_queue_kobjects net/core/net-sysfs.c:1803 [inline]
netdev_register_kobject+0x274/0x3f0 net/core/net-sysfs.c:2048
register_netdevice+0x1382/0x1da0 net/core/dev.c:10218
veth_newlink+0x363/0xa00 drivers/net/veth.c:1895
rtnl_newlink_create net/core/rtnetlink.c:3521 [inline]
__rtnl_newlink+0x1173/0x1930 net/core/rtnetlink.c:3741
rtnl_newlink+0x67/0xa0 net/core/rtnetlink.c:3754
Memory state around the buggy address:
ffff88801b458b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88801b458b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88801b458c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88801b458c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88801b458d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 89 07 mov %eax,(%rdi)
2: 49 c7 c0 08 00 00 00 mov $0x8,%r8
9: 4d 29 c8 sub %r9,%r8
c: 4c 01 c7 add %r8,%rdi
f: 4c 29 c2 sub %r8,%rdx
12: e9 76 ff ff ff jmp 0xffffff8d
17: cc int3
18: cc int3
19: cc int3
1a: cc int3
1b: f3 0f 1e fa endbr64
1f: 66 90 xchg %ax,%ax
21: 0f 00 2d 53 5a 47 00 verw 0x475a53(%rip) # 0x475a7b
28: fb sti
29: f4 hlt
* 2a: fa cli <-- trapping instruction
2b: c3 ret
2c: 66 66 2e 0f 1f 84 00 data16 cs nopw 0x0(%rax,%rax,1)
33: 00 00 00 00
37: 0f 1f 40 00 nopl 0x0(%rax)
3b: f3 0f 1e fa endbr64
3f: 65 gs