==================================================================
BUG: KASAN: slab-use-after-free in __lock_acquire+0x2d90/0x3c40 kernel/locking/lockdep.c:5089
Read of size 8 at addr ffff888023c8ec18 by task syz.3.461/7738
CPU: 3 UID: 0 PID: 7738 Comm: syz.3.461 Not tainted 6.13.0-rc2-syzkaller-00036-g231825b2e1ff #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0xc3/0x620 mm/kasan/report.c:489
kasan_report+0xd9/0x110 mm/kasan/report.c:602
__lock_acquire+0x2d90/0x3c40 kernel/locking/lockdep.c:5089
lock_acquire.part.0+0x11b/0x380 kernel/locking/lockdep.c:5849
__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:397 [inline]
p9_req_put net/9p/client.c:405 [inline]
p9_req_put+0xaf/0x250 net/9p/client.c:402
req_done+0x1e7/0x2f0 net/9p/trans_virtio.c:147
vring_interrupt drivers/virtio/virtio_ring.c:2715 [inline]
vring_interrupt+0x31b/0x400 drivers/virtio/virtio_ring.c:2690
__handle_irq_event_percpu+0x229/0x7d0 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:173 [inline]
handle_irq arch/x86/kernel/irq.c:247 [inline]
call_irq_handler arch/x86/kernel/irq.c:259 [inline]
__common_interrupt+0xdf/0x250 arch/x86/kernel/irq.c:285
common_interrupt+0xba/0xe0 arch/x86/kernel/irq.c:278
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:693
RIP: 0010:trace_lock_acquire+0x6/0x1f0 include/trace/events/lock.h:24
Code: 31 d2 4c 89 cf e8 6a c1 18 00 48 89 c6 eb aa e8 40 05 b3 09 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 41 56 41 55 55 53 <48> 83 ec 18 66 90 49 c7 c5 0c d9 03 00 65 41 8b 5d 00 83 fb 07 0f
RSP: 0018:ffffc900039f74f8 EFLAGS: 00000296
RAX: ffffffff820853e4 RBX: ffffffff820853e4 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e1bb500
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000003 R12: 0000000000000000
R13: 0000000000000002 R14: 0000000000000000 R15: 0000000000000000
lock_acquire+0x2f/0xb0 kernel/locking/lockdep.c:5820
rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
rcu_read_lock include/linux/rcupdate.h:849 [inline]
page_ext_get+0x3a/0x310 mm/page_ext.c:525
page_table_check_clear.part.0+0x32/0x540 mm/page_table_check.c:74
page_table_check_clear mm/page_table_check.c:70 [inline]
__page_table_check_pte_clear+0x328/0x580 mm/page_table_check.c:169
page_table_check_pte_clear include/linux/page_table_check.h:49 [inline]
ptep_get_and_clear_full arch/x86/include/asm/pgtable.h:1337 [inline]
get_and_clear_full_ptes include/linux/pgtable.h:705 [inline]
zap_present_folio_ptes mm/memory.c:1502 [inline]
zap_present_ptes mm/memory.c:1585 [inline]
zap_pte_range mm/memory.c:1627 [inline]
zap_pmd_range mm/memory.c:1753 [inline]
zap_pud_range mm/memory.c:1782 [inline]
zap_p4d_range mm/memory.c:1803 [inline]
unmap_page_range+0x22f6/0x3d60 mm/memory.c:1824
unmap_single_vma+0x194/0x2b0 mm/memory.c:1870
unmap_vmas+0x22f/0x490 mm/memory.c:1914
exit_mmap+0x1c6/0xb20 mm/mmap.c:1668
__mmput+0x12a/0x4c0 kernel/fork.c:1353
mmput+0x62/0x70 kernel/fork.c:1375
exit_mm kernel/exit.c:570 [inline]
do_exit+0x9bf/0x2d70 kernel/exit.c:925
do_group_exit+0xd3/0x2a0 kernel/exit.c:1087
get_signal+0x24ed/0x26c0 kernel/signal.c:3017
arch_do_signal_or_restart+0x90/0x7e0 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218
do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f11fc385d19
Code: Unable to access opcode bytes at 0x7f11fc385cef.
RSP: 002b:00007f11fd26b0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000000 RBX: 00007f11fc576088 RCX: 00007f11fc385d19
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f11fc576088
RBP: 00007f11fc576080 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f11fc57608c
R13: 0000000000000000 R14: 00007fff6ba08730 R15: 00007fff6ba08818
Allocated by task 7745:
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:377 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
kmalloc_noprof include/linux/slab.h:901 [inline]
p9_client_create+0xc8/0x1200 net/9p/client.c:985
v9fs_session_init+0x1f8/0x1a80 fs/9p/v9fs.c:410
v9fs_mount+0xc6/0xa30 fs/9p/vfs_super.c:122
legacy_get_tree+0x109/0x220 fs/fs_context.c:662
vfs_get_tree+0x8f/0x380 fs/super.c:1814
do_new_mount fs/namespace.c:3507 [inline]
path_mount+0x14e6/0x1f20 fs/namespace.c:3834
do_mount fs/namespace.c:3847 [inline]
__do_sys_mount fs/namespace.c:4057 [inline]
__se_sys_mount fs/namespace.c:4034 [inline]
__x64_sys_mount+0x294/0x320 fs/namespace.c:4034
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 7745:
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:582
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x51/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2338 [inline]
slab_free mm/slub.c:4598 [inline]
kfree+0x14f/0x4b0 mm/slub.c:4746
p9_client_create+0xa58/0x1200 net/9p/client.c:1064
v9fs_session_init+0x1f8/0x1a80 fs/9p/v9fs.c:410
v9fs_mount+0xc6/0xa30 fs/9p/vfs_super.c:122
legacy_get_tree+0x109/0x220 fs/fs_context.c:662
vfs_get_tree+0x8f/0x380 fs/super.c:1814
do_new_mount fs/namespace.c:3507 [inline]
path_mount+0x14e6/0x1f20 fs/namespace.c:3834
do_mount fs/namespace.c:3847 [inline]
__do_sys_mount fs/namespace.c:4057 [inline]
__se_sys_mount fs/namespace.c:4034 [inline]
__x64_sys_mount+0x294/0x320 fs/namespace.c:4034
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888023c8ec00
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
freed 512-byte region [ffff888023c8ec00, ffff888023c8ee00)
The buggy address belongs to the physical page:
page: refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x23c8c
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 ffff88801b042c80 ffffea00008f6b00 dead000000000002
raw: 0000000000000000 0000000080100010 00000001f5000000 0000000000000000
head: 00fff00000000040 ffff88801b042c80 ffffea00008f6b00 dead000000000002
head: 0000000000000000 0000000080100010 00000001f5000000 0000000000000000
head: 00fff00000000002 ffffea00008f2301 ffffffffffffffff 0000000000000000
head: 0000000000000004 0000000000000000 00000000ffffffff 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 374, tgid 374 (kworker/u32:6), ts 108156101417, free_ts 108104768327
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x2d1/0x350 mm/page_alloc.c:1556
prep_new_page mm/page_alloc.c:1564 [inline]
get_page_from_freelist+0xfce/0x2f80 mm/page_alloc.c:3474
__alloc_pages_noprof+0x223/0x25b0 mm/page_alloc.c:4751
alloc_pages_mpol_noprof+0x2c9/0x610 mm/mempolicy.c:2269
alloc_slab_page mm/slub.c:2408 [inline]
allocate_slab mm/slub.c:2574 [inline]
new_slab+0x2c9/0x410 mm/slub.c:2627
___slab_alloc+0xdac/0x1870 mm/slub.c:3815
__slab_alloc.constprop.0+0x56/0xb0 mm/slub.c:3905
__slab_alloc_node mm/slub.c:3980 [inline]
slab_alloc_node mm/slub.c:4141 [inline]
__do_kmalloc_node mm/slub.c:4282 [inline]
__kmalloc_noprof+0x2ec/0x510 mm/slub.c:4295
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1037 [inline]
fib6_info_alloc+0x40/0x160 net/ipv6/ip6_fib.c:155
ip6_route_info_create+0x337/0x1910 net/ipv6/route.c:3761
ip6_route_add+0x26/0x1c0 net/ipv6/route.c:3853
addrconf_prefix_route+0x2fe/0x510 net/ipv6/addrconf.c:2486
addrconf_add_linklocal+0x32a/0x620 net/ipv6/addrconf.c:3338
addrconf_addr_gen+0x36f/0x3c0 net/ipv6/addrconf.c:3467
addrconf_dev_config net/ipv6/addrconf.c:3513 [inline]
addrconf_init_auto_addrs+0x446/0x820 net/ipv6/addrconf.c:3591
addrconf_notify+0x6e2/0x19c0 net/ipv6/addrconf.c:3764
page last free pid 6006 tgid 6006 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1127 [inline]
free_unref_page+0x661/0x1080 mm/page_alloc.c:2657
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x4e/0x120 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x195/0x1e0 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4104 [inline]
slab_alloc_node mm/slub.c:4153 [inline]
kmem_cache_alloc_noprof+0x226/0x3d0 mm/slub.c:4160
getname_flags.part.0+0x4c/0x550 fs/namei.c:139
getname_flags include/linux/audit.h:322 [inline]
getname+0x8d/0xe0 fs/namei.c:223
getname_maybe_null include/linux/fs.h:2796 [inline]
vfs_fstatat+0xdf/0xf0 fs/stat.c:361
__do_sys_newfstatat+0xa2/0x130 fs/stat.c:530
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff888023c8eb00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888023c8eb80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888023c8ec00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888023c8ec80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888023c8ed00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 31 d2 xor %edx,%edx
2: 4c 89 cf mov %r9,%rdi
5: e8 6a c1 18 00 call 0x18c174
a: 48 89 c6 mov %rax,%rsi
d: eb aa jmp 0xffffffb9
f: e8 40 05 b3 09 call 0x9b30554
14: 90 nop
15: 90 nop
16: 90 nop
17: 90 nop
18: 90 nop
19: 90 nop
1a: 90 nop
1b: 90 nop
1c: 90 nop
1d: 90 nop
1e: 90 nop
1f: 90 nop
20: 90 nop
21: 90 nop
22: 90 nop
23: 90 nop
24: 41 56 push %r14
26: 41 55 push %r13
28: 55 push %rbp
29: 53 push %rbx
* 2a: 48 83 ec 18 sub $0x18,%rsp <-- trapping instruction
2e: 66 90 xchg %ax,%ax
30: 49 c7 c5 0c d9 03 00 mov $0x3d90c,%r13
37: 65 41 8b 5d 00 mov %gs:0x0(%r13),%ebx
3c: 83 fb 07 cmp $0x7,%ebx
3f: 0f .byte 0xf