==================================================================
BUG: KASAN: slab-use-after-free in __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
BUG: KASAN: slab-use-after-free in _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
Read of size 1 at addr ffff888024cf0418 by task swapper/0/0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full)
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0x156/0x4c9 mm/kasan/report.c:482
kasan_report+0xdf/0x1e0 mm/kasan/report.c:595
__kasan_check_byte+0x36/0x50 mm/kasan/common.c:574
kasan_check_byte include/linux/kasan.h:402 [inline]
lock_acquire kernel/locking/lockdep.c:5842 [inline]
lock_acquire+0x148/0x380 kernel/locking/lockdep.c:5825
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:162
p9_tag_remove net/9p/client.c:274 [inline]
p9_req_put net/9p/client.c:282 [inline]
p9_req_put+0xaf/0x250 net/9p/client.c:279
req_done+0x1dc/0x2e0 net/9p/trans_virtio.c:147
vring_interrupt+0x2ef/0x650 drivers/virtio/virtio_ring.c:3255
__handle_irq_event_percpu+0x232/0x8e0 kernel/irq/handle.c:209
handle_irq_event_percpu kernel/irq/handle.c:246 [inline]
handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:263
handle_edge_irq+0x375/0x970 kernel/irq/chip.c:855
generic_handle_irq_desc include/linux/irqdesc.h:186 [inline]
handle_irq arch/x86/kernel/irq.c:262 [inline]
call_irq_handler arch/x86/kernel/irq.c:318 [inline]
__common_interrupt+0xd8/0x2f0 arch/x86/kernel/irq.c:333
common_interrupt+0xb9/0xe0 arch/x86/kernel/irq.c:326
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688
RIP: 0010:sched_core_balance+0x9f/0xe20 kernel/sched/core.c:6326
Code: 92 7e 8e e8 63 ef 0d 00 e8 ce d6 b5 09 41 5a 85 c0 0f 85 28 0a 00 00 4c 89 ef e8 fc 35 ff ff e8 07 ad 39 00 fb 48 63 44 24 50 <48> c7 c3 80 72 0e 94 48 89 dd 48 89 44 24 08 48 83 f8 08 0f 83 4c
RSP: 0000:ffffffff8e407b70 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffff88802b23b280 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8de76c50 RDI: ffffffff8c1ae520
RBP: ffffffff8e407c88 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff8e4975c0
R13: ffff88802b23b280 R14: 0000000000000000 R15: dffffc0000000000
do_balance_callbacks kernel/sched/core.c:4926 [inline]
__balance_callbacks kernel/sched/core.c:4982 [inline]
finish_lock_switch kernel/sched/core.c:5031 [inline]
finish_task_switch.isra.0+0x446/0xb80 kernel/sched/core.c:5150
context_switch kernel/sched/core.c:5298 [inline]
__schedule+0xff6/0x60e0 kernel/sched/core.c:6907
schedule_idle+0x54/0x80 kernel/sched/core.c:7030
do_idle+0x289/0x4b0 kernel/sched/idle.c:360
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:430
rest_init+0x251/0x260 init/main.c:760
start_kernel+0x47f/0x480 init/main.c:1210
x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310
x86_64_start_kernel+0x12b/0x130 arch/x86/kernel/head64.c:291
common_startup_64+0x13e/0x148
Allocated by task 8791:
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
poison_kmalloc_redzone mm/kasan/common.c:398 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:415
kmalloc_noprof include/linux/slab.h:962 [inline]
p9_client_create+0xaf/0xd40 net/9p/client.c:862
v9fs_session_init+0x40/0xce0 fs/9p/v9fs.c:442
v9fs_get_tree+0xb8/0xb50 fs/9p/vfs_super.c:97
vfs_get_tree+0x92/0x320 fs/super.c:1754
fc_mount fs/namespace.c:1193 [inline]
do_new_mount_fc fs/namespace.c:3760 [inline]
do_new_mount fs/namespace.c:3836 [inline]
path_mount+0x7d0/0x23d0 fs/namespace.c:4146
do_mount fs/namespace.c:4159 [inline]
__do_sys_mount fs/namespace.c:4348 [inline]
__se_sys_mount fs/namespace.c:4325 [inline]
__ia32_sys_mount+0x292/0x310 fs/namespace.c:4325
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0xe3/0x8c0 arch/x86/entry/syscall_32.c:307
do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:332
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
Freed by task 8791:
kasan_save_stack+0x30/0x50 mm/kasan/common.c:57
kasan_save_track+0x14/0x30 mm/kasan/common.c:78
kasan_save_free_info+0x3b/0x70 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5f/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2687 [inline]
slab_free mm/slub.c:6124 [inline]
kfree+0x1f6/0x6b0 mm/slub.c:6442
p9_client_create+0x72d/0xd40 net/9p/client.c:941
v9fs_session_init+0x40/0xce0 fs/9p/v9fs.c:442
v9fs_get_tree+0xb8/0xb50 fs/9p/vfs_super.c:97
vfs_get_tree+0x92/0x320 fs/super.c:1754
fc_mount fs/namespace.c:1193 [inline]
do_new_mount_fc fs/namespace.c:3760 [inline]
do_new_mount fs/namespace.c:3836 [inline]
path_mount+0x7d0/0x23d0 fs/namespace.c:4146
do_mount fs/namespace.c:4159 [inline]
__do_sys_mount fs/namespace.c:4348 [inline]
__se_sys_mount fs/namespace.c:4325 [inline]
__ia32_sys_mount+0x292/0x310 fs/namespace.c:4325
do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline]
__do_fast_syscall_32+0xe3/0x8c0 arch/x86/entry/syscall_32.c:307
do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:332
entry_SYSENTER_compat_after_hwframe+0x84/0x8e
The buggy address belongs to the object at ffff888024cf0400
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
freed 512-byte region [ffff888024cf0400, ffff888024cf0600)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x24cf0
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801b842c80 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b842c80 dead000000000100 dead000000000122
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0000933c01 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
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 99, tgid 99 (kworker/u32:4), ts 56533371445, free_ts 56064526030
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x153/0x170 mm/page_alloc.c:1888
prep_new_page mm/page_alloc.c:1896 [inline]
get_page_from_freelist+0x111d/0x3140 mm/page_alloc.c:3961
__alloc_frozen_pages_noprof+0x27c/0x2ba0 mm/page_alloc.c:5249
alloc_slab_page mm/slub.c:3255 [inline]
allocate_slab mm/slub.c:3444 [inline]
new_slab+0xa6/0x6d0 mm/slub.c:3502
refill_objects+0x26b/0x400 mm/slub.c:7134
refill_sheaf mm/slub.c:2804 [inline]
alloc_full_sheaf mm/slub.c:2825 [inline]
__pcs_replace_empty_main+0x19f/0x600 mm/slub.c:4588
alloc_from_pcs mm/slub.c:4681 [inline]
slab_alloc_node mm/slub.c:4815 [inline]
__do_kmalloc_node mm/slub.c:5218 [inline]
__kmalloc_noprof+0x688/0x850 mm/slub.c:5231
kmalloc_noprof include/linux/slab.h:966 [inline]
kzalloc_noprof include/linux/slab.h:1204 [inline]
fib6_info_alloc+0x40/0x160 net/ipv6/ip6_fib.c:155
ip6_route_info_create+0x14c/0xad0 net/ipv6/route.c:3819
ip6_route_add+0x4b/0x1d0 net/ipv6/route.c:3948
addrconf_add_mroute+0x1de/0x350 net/ipv6/addrconf.c:2552
addrconf_add_dev+0x14e/0x1a0 net/ipv6/addrconf.c:2570
addrconf_dev_config net/ipv6/addrconf.c:3484 [inline]
addrconf_init_auto_addrs+0x10e/0x780 net/ipv6/addrconf.c:3572
addrconf_notify+0x9aa/0x19c0 net/ipv6/addrconf.c:3745
notifier_call_chain+0x99/0x420 kernel/notifier.c:85
call_netdevice_notifiers_info+0xbe/0x110 net/core/dev.c:2242
page last free pid 2 tgid 2 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
__free_pages_prepare mm/page_alloc.c:1432 [inline]
__free_frozen_pages+0x7ca/0x10a0 mm/page_alloc.c:2977
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x47/0xe0 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:350
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4501 [inline]
slab_alloc_node mm/slub.c:4830 [inline]
__kmalloc_cache_noprof+0x243/0x6f0 mm/slub.c:5334
kmalloc_noprof include/linux/slab.h:962 [inline]
kzalloc_noprof include/linux/slab.h:1204 [inline]
set_kthread_struct+0xcb/0x3a0 kernel/kthread.c:125
copy_process+0x3978/0x7a10 kernel/fork.c:2152
kernel_clone+0xfc/0x9a0 kernel/fork.c:2654
kernel_thread+0xdb/0x120 kernel/fork.c:2715
create_kthread kernel/kthread.c:490 [inline]
kthreadd+0x498/0x7a0 kernel/kthread.c:849
ret_from_fork+0x754/0xd80 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Memory state around the buggy address:
ffff888024cf0300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888024cf0380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888024cf0400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888024cf0480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888024cf0500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 92 xchg %eax,%edx
1: 7e 8e jle 0xffffff91
3: e8 63 ef 0d 00 call 0xdef6b
8: e8 ce d6 b5 09 call 0x9b5d6db
d: 41 5a pop %r10
f: 85 c0 test %eax,%eax
11: 0f 85 28 0a 00 00 jne 0xa3f
17: 4c 89 ef mov %r13,%rdi
1a: e8 fc 35 ff ff call 0xffff361b
1f: e8 07 ad 39 00 call 0x39ad2b
24: fb sti
25: 48 63 44 24 50 movslq 0x50(%rsp),%rax
* 2a: 48 c7 c3 80 72 0e 94 mov $0xffffffff940e7280,%rbx <-- trapping instruction
31: 48 89 dd mov %rbx,%rbp
34: 48 89 44 24 08 mov %rax,0x8(%rsp)
39: 48 83 f8 08 cmp $0x8,%rax
3d: 0f .byte 0xf
3e: 83 .byte 0x83
3f: 4c rex.WR