==================================================================
BUG: KASAN: slab-use-after-free in __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:155 [inline]
BUG: KASAN: slab-use-after-free in _raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:181
Read of size 1 at addr ffff88802f40a818 by task syz.3.506/7708
CPU: 3 UID: 0 PID: 7708 Comm: syz.3.506 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
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+0x13d/0x4b0 mm/kasan/report.c:482
kasan_report+0xdf/0x1c0 mm/kasan/report.c:595
__kasan_check_byte+0x36/0x50 mm/kasan/common.c:585
kasan_check_byte include/linux/kasan.h:402 [inline]
lock_acquire kernel/locking/lockdep.c:5916 [inline]
lock_acquire+0x132/0x380 kernel/locking/lockdep.c:5899
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:155 [inline]
_raw_spin_lock_irqsave+0x3a/0x60 kernel/locking/spinlock.c:181
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/0x660 drivers/virtio/virtio_ring.c:3335
__handle_irq_event_percpu+0x232/0x880 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+0x34c/0x950 kernel/irq/chip.c:859
generic_handle_irq_desc include/linux/irqdesc.h:188 [inline]
handle_irq arch/x86/kernel/irq.c:209 [inline]
call_irq_handler arch/x86/kernel/irq.c:265 [inline]
__common_interrupt+0xd8/0x2f0 arch/x86/kernel/irq.c:280
common_interrupt+0xb9/0xe0 arch/x86/kernel/irq.c:273
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:665
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:211 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:221
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 76 ae 11 f6 48 89 df e8 fe 04 12 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 15 e8 00 f6 65 48 83 3d b4 53 b7 08 00 74 16 5b
RSP: 0018:ffffc900038afae0 EFLAGS: 00000246
RAX: 0000000000000006 RBX: ffff888035638a80 RCX: 0000000000000000
RDX: 0000000000000002 RSI: ffffffff8e38f5e4 RDI: ffffffff8c623a80
RBP: 0000000000000206 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffffff948edf00
R13: ffff8880d5d4e000 R14: ffff888035638a80 R15: ffff888035638000
class_raw_spinlock_irqsave_destructor include/linux/spinlock.h:594 [inline]
try_to_wake_up+0xd8d/0x1c90 kernel/sched/core.c:4315
wake_up_process kernel/sched/core.c:4570 [inline]
wake_up_q+0xa1/0x130 kernel/sched/core.c:1183
futex_wake+0x4f4/0x5e0 kernel/futex/waitwake.c:225
do_futex+0x2b2/0x440 kernel/futex/syscalls.c:138
__do_sys_futex kernel/futex/syscalls.c:210 [inline]
__se_sys_futex kernel/futex/syscalls.c:191 [inline]
__x64_sys_futex+0x34f/0x4d0 kernel/futex/syscalls.c:191
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f556999e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff4f22c308 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f556999e159
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f5569c25fa8
RBP: 0000000000001164 R08: 0000000000000030 R09: 0000000000000000
R10: 00007f5569c25fa0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5569c25fac R14: 00007f5569c25fa8 R15: 00007f5569c25fa0
Allocated by task 7709:
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:409 [inline]
__kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:426
kasan_kmalloc include/linux/kasan.h:263 [inline]
__kmalloc_cache_noprof+0x2f8/0x6d0 mm/slub.c:5563
_kmalloc_noprof include/linux/slab.h:991 [inline]
p9_client_create+0xaf/0xd40 net/9p/client.c:864
v9fs_session_init+0x3c/0xdd0 fs/9p/v9fs.c:471
v9fs_get_tree+0xb8/0xb50 fs/9p/vfs_super.c:97
vfs_get_tree+0x92/0x320 fs/super.c:1932
fc_mount fs/namespace.c:1198 [inline]
do_new_mount_fc fs/namespace.c:3772 [inline]
do_new_mount fs/namespace.c:3848 [inline]
path_mount+0x7d0/0x24c0 fs/namespace.c:4168
do_mount fs/namespace.c:4181 [inline]
__do_sys_mount fs/namespace.c:4397 [inline]
__se_sys_mount fs/namespace.c:4374 [inline]
__x64_sys_mount+0x293/0x310 fs/namespace.c:4374
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 7709:
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:264 [inline]
__kasan_slab_free+0x5f/0x80 mm/kasan/common.c:296
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2748 [inline]
slab_free mm/slub.c:6509 [inline]
kfree+0x22b/0x6d0 mm/slub.c:6802
p9_client_create+0x72d/0xd40 net/9p/client.c:943
v9fs_session_init+0x3c/0xdd0 fs/9p/v9fs.c:471
v9fs_get_tree+0xb8/0xb50 fs/9p/vfs_super.c:97
vfs_get_tree+0x92/0x320 fs/super.c:1932
fc_mount fs/namespace.c:1198 [inline]
do_new_mount_fc fs/namespace.c:3772 [inline]
do_new_mount fs/namespace.c:3848 [inline]
path_mount+0x7d0/0x24c0 fs/namespace.c:4168
do_mount fs/namespace.c:4181 [inline]
__do_sys_mount fs/namespace.c:4397 [inline]
__se_sys_mount fs/namespace.c:4374 [inline]
__x64_sys_mount+0x293/0x310 fs/namespace.c:4374
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff88802f40a800
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
freed 512-byte region [ffff88802f40a800, ffff88802f40aa00)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x2f408
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 ffff88801c042c80 dead000000000100 dead000000000122
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801c042c80 dead000000000100 dead000000000122
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffffffffffff01 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 0xd2820(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 5791, tgid 5791 (kworker/u32:2), ts 78249474897
set_page_owner include/linux/page_owner.h:33 [inline]
post_alloc_hook+0xfd/0x120 mm/page_alloc.c:1871
prep_new_page mm/page_alloc.c:1879 [inline]
get_page_from_freelist+0x110d/0x35d0 mm/page_alloc.c:3943
__alloc_frozen_pages_noprof+0x2eb/0x3300 mm/page_alloc.c:5436
alloc_slab_page mm/slub.c:3347 [inline]
allocate_slab mm/slub.c:3462 [inline]
new_slab+0xa9/0x6e0 mm/slub.c:3513
refill_objects+0xe3/0x410 mm/slub.c:7418
refill_sheaf mm/slub.c:2885 [inline]
__pcs_replace_empty_main+0x35e/0x650 mm/slub.c:4774
alloc_from_pcs mm/slub.c:4850 [inline]
slab_alloc_node mm/slub.c:4984 [inline]
__kmalloc_cache_noprof+0x4f4/0x6d0 mm/slub.c:5559
_kmalloc_noprof include/linux/slab.h:991 [inline]
batadv_forw_packet_alloc+0x3a9/0x4d0 net/batman-adv/send.c:511
batadv_iv_ogm_aggregate_new+0x11e/0x4c0 net/batman-adv/bat_iv_ogm.c:648
batadv_iv_ogm_queue_add net/batman-adv/bat_iv_ogm.c:769 [inline]
batadv_iv_ogm_schedule_buff+0x94d/0x15d0 net/batman-adv/bat_iv_ogm.c:957
batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:1011 [inline]
batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:1005 [inline]
batadv_iv_send_outstanding_bat_ogm_packet+0x517/0x7d0 net/batman-adv/bat_iv_ogm.c:1924
process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
process_scheduled_works kernel/workqueue.c:3479 [inline]
worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
kthread+0x373/0x450 kernel/kthread.c:436
ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
page last free pid 5880 tgid 5880 ts 76648815158 stack trace:
reset_page_owner include/linux/page_owner.h:26 [inline]
__free_pages_prepare mm/page_alloc.c:1418 [inline]
__free_frozen_pages+0x79f/0x10f0 mm/page_alloc.c:2962
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x47/0xf0 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x1a0/0x1f0 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x69/0x90 mm/kasan/common.c:361
kasan_slab_alloc include/linux/kasan.h:253 [inline]
slab_post_alloc_hook mm/slub.c:4683 [inline]
slab_alloc_node mm/slub.c:4996 [inline]
kmem_cache_alloc_noprof+0x269/0x6a0 mm/slub.c:5010
vm_area_alloc+0x1f/0x160 mm/vma_init.c:36
__mmap_new_vma mm/vma.c:2656 [inline]
__mmap_region+0x1025/0x32e0 mm/vma.c:2889
mmap_region+0x3db/0x6d0 mm/vma.c:2974
do_mmap+0x12c7/0x1c30 mm/mmap.c:573
vm_mmap_pgoff+0x28d/0x470 mm/util.c:581
ksys_mmap_pgoff+0x3cb/0x610 mm/mmap.c:619
__do_sys_mmap arch/x86/kernel/sys_x86_64.c:96 [inline]
__se_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
__x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:89
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Memory state around the buggy address:
ffff88802f40a700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88802f40a780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88802f40a800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88802f40a880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88802f40a900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: f5 cmc
1: 53 push %rbx
2: 48 8b 74 24 10 mov 0x10(%rsp),%rsi
7: 48 89 fb mov %rdi,%rbx
a: 48 83 c7 18 add $0x18,%rdi
e: e8 76 ae 11 f6 call 0xf611ae89
13: 48 89 df mov %rbx,%rdi
16: e8 fe 04 12 f6 call 0xf6120519
1b: f7 c5 00 02 00 00 test $0x200,%ebp
21: 75 23 jne 0x46
23: 9c pushf
24: 58 pop %rax
25: f6 c4 02 test $0x2,%ah
28: 75 37 jne 0x61
* 2a: bf 01 00 00 00 mov $0x1,%edi <-- trapping instruction
2f: e8 15 e8 00 f6 call 0xf600e849
34: 65 48 83 3d b4 53 b7 cmpq $0x0,%gs:0x8b753b4(%rip) # 0x8b753f1
3b: 08 00
3d: 74 16 je 0x55
3f: 5b pop %rbx