==================================================================
BUG: KASAN: slab-use-after-free in __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [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 ffff888039925818 by task syz.7.3293/27054
CPU: 3 UID: 0 PID: 27054 Comm: syz.7.3293 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+0x156/0x4c9 mm/kasan/report.c:482
kasan_report+0xdf/0x1a0 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+0xf5/0x330 kernel/locking/lockdep.c:5825
__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: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+0x33b/0x430 drivers/virtio/virtio_ring.c:2718
__handle_irq_event_percpu+0x232/0x800 kernel/irq/handle.c:211
handle_irq_event_percpu kernel/irq/handle.c:248 [inline]
handle_irq_event+0xab/0x1e0 kernel/irq/handle.c:265
handle_edge_irq+0x375/0x970 kernel/irq/chip.c:855
generic_handle_irq_desc include/linux/irqdesc.h:172 [inline]
handle_irq arch/x86/kernel/irq.c:255 [inline]
call_irq_handler arch/x86/kernel/irq.c:311 [inline]
__common_interrupt+0xd8/0x2f0 arch/x86/kernel/irq.c:326
common_interrupt+0xb9/0xe0 arch/x86/kernel/irq.c:319
asm_common_interrupt+0x26/0x40 arch/x86/include/asm/idtentry.h:688
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x31/0x80 kernel/locking/spinlock.c:194
Code: f5 53 48 8b 74 24 10 48 89 fb 48 83 c7 18 e8 a6 8c 69 f6 48 89 df e8 8e da 69 f6 f7 c5 00 02 00 00 75 23 9c 58 f6 c4 02 75 37 01 00 00 00 e8 45 29 5a f6 65 8b 05 3e ba 6a 08 85 c0 74 16 5b
RSP: 0018:ffffc90005fb7b68 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffff888064b58a50 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8dc454ef RDI: ffffffff8bfa35a0
RBP: 0000000000000206 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff888064b58000
R13: ffff888064b58a50 R14: 0000000000000003 R15: ffff888064b58a4f
class_raw_spinlock_irqsave_destructor include/linux/spinlock.h:557 [inline]
try_to_wake_up+0x403/0x1a60 kernel/sched/core.c:4106
wake_up_process kernel/sched/core.c:4349 [inline]
wake_up_q+0xa1/0x130 kernel/sched/core.c:1087
futex_wake+0x460/0x530 kernel/futex/waitwake.c:198
do_futex+0x32b/0x350 kernel/futex/syscalls.c:135
__do_sys_futex kernel/futex/syscalls.c:207 [inline]
__se_sys_futex kernel/futex/syscalls.c:188 [inline]
__x64_sys_futex+0x34f/0x4d0 kernel/futex/syscalls.c:188
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f353f39aeb9
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:00007fff41b0d168 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f353f39aeb9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f353f615fa8
RBP: 00000000000010a0 R08: 0000000000000008 R09: 0000000000000000
R10: 00007f353f615fa0 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f353f615fac R14: 00007f353f615fa8 R15: 00007f353f615fa0
Allocated by task 27055:
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:957 [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:1751
fc_mount fs/namespace.c:1199 [inline]
do_new_mount_fc fs/namespace.c:3636 [inline]
do_new_mount fs/namespace.c:3712 [inline]
path_mount+0x7d0/0x23c0 fs/namespace.c:4022
do_mount fs/namespace.c:4035 [inline]
__do_sys_mount fs/namespace.c:4224 [inline]
__se_sys_mount fs/namespace.c:4201 [inline]
__x64_sys_mount+0x293/0x310 fs/namespace.c:4201
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 27055:
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:2540 [inline]
slab_free mm/slub.c:6674 [inline]
kfree+0x1c7/0x690 mm/slub.c:6882
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:1751
fc_mount fs/namespace.c:1199 [inline]
do_new_mount_fc fs/namespace.c:3636 [inline]
do_new_mount fs/namespace.c:3712 [inline]
path_mount+0x7d0/0x23c0 fs/namespace.c:4022
do_mount fs/namespace.c:4035 [inline]
__do_sys_mount fs/namespace.c:4224 [inline]
__se_sys_mount fs/namespace.c:4201 [inline]
__x64_sys_mount+0x293/0x310 fs/namespace.c:4201
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888039925800
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
freed 512-byte region [ffff888039925800, ffff888039925a00)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x39924
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 0000000080100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b842c80 dead000000000100 dead000000000122
head: 0000000000000000 0000000080100010 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0000e64901 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 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 26274, tgid 26273 (syz.4.3150), ts 403243175810, free_ts 398875263660
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x1e1/0x250 mm/page_alloc.c:1884
prep_new_page mm/page_alloc.c:1892 [inline]
get_page_from_freelist+0xe3d/0x2e10 mm/page_alloc.c:3945
__alloc_frozen_pages_noprof+0x26c/0x2410 mm/page_alloc.c:5240
alloc_slab_page mm/slub.c:3077 [inline]
allocate_slab mm/slub.c:3248 [inline]
new_slab+0xaf/0x440 mm/slub.c:3302
___slab_alloc+0xda3/0x1ca0 mm/slub.c:4656
__slab_alloc.isra.0+0x63/0x110 mm/slub.c:4779
__slab_alloc_node mm/slub.c:4855 [inline]
slab_alloc_node mm/slub.c:5251 [inline]
__do_kmalloc_node mm/slub.c:5656 [inline]
__kmalloc_node_noprof+0x62b/0x9e0 mm/slub.c:5663
kmalloc_array_node_noprof include/linux/slab.h:1075 [inline]
alloc_slab_obj_exts+0x46/0x110 mm/slub.c:2123
account_slab mm/slub.c:3202 [inline]
allocate_slab mm/slub.c:3267 [inline]
new_slab+0x354/0x440 mm/slub.c:3302
___slab_alloc+0xda3/0x1ca0 mm/slub.c:4656
__slab_alloc.isra.0+0x63/0x110 mm/slub.c:4779
__slab_alloc_node mm/slub.c:4855 [inline]
slab_alloc_node mm/slub.c:5251 [inline]
__do_kmalloc_node mm/slub.c:5656 [inline]
__kmalloc_noprof+0x618/0x9c0 mm/slub.c:5669
kmalloc_noprof include/linux/slab.h:961 [inline]
kzalloc_noprof include/linux/slab.h:1094 [inline]
io_alloc_ocqe+0xd6/0x510 io_uring/io_uring.c:728
io_cqe_overflow_locked io_uring/io_uring.c:868 [inline]
__io_submit_flush_completions.cold+0x91/0xae io_uring/io_uring.c:1532
io_submit_flush_completions io_uring/io_uring.h:239 [inline]
io_submit_state_end io_uring/io_uring.c:2335 [inline]
io_submit_sqes+0xc02/0x21c0 io_uring/io_uring.c:2450
__do_sys_io_uring_enter+0x6b4/0x15b0 io_uring/io_uring.c:3285
page last free pid 22090 tgid 22090 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1433 [inline]
__free_frozen_pages+0x822/0x1130 mm/page_alloc.c:2973
discard_slab mm/slub.c:3346 [inline]
__put_partials+0x127/0x160 mm/slub.c:3886
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:4953 [inline]
slab_alloc_node mm/slub.c:5263 [inline]
kmem_cache_alloc_lru_noprof+0x2c7/0x7d0 mm/slub.c:5282
shmem_alloc_inode+0x25/0x50 mm/shmem.c:5152
alloc_inode+0x68/0x250 fs/inode.c:346
new_inode+0x22/0x1c0 fs/inode.c:1175
__shmem_get_inode mm/shmem.c:3068 [inline]
shmem_get_inode+0x197/0xf30 mm/shmem.c:3142
shmem_mknod+0x1a2/0x3b0 mm/shmem.c:3872
lookup_open.isra.0+0x139b/0x1890 fs/namei.c:4449
open_last_lookups fs/namei.c:4549 [inline]
path_openat+0x117d/0x3120 fs/namei.c:4793
do_filp_open+0x1f7/0x420 fs/namei.c:4823
do_sys_openat2+0x12e/0x220 fs/open.c:1430
do_sys_open fs/open.c:1436 [inline]
__do_sys_openat fs/open.c:1452 [inline]
__se_sys_openat fs/open.c:1447 [inline]
__x64_sys_openat+0x12d/0x210 fs/open.c:1447
Memory state around the buggy address:
ffff888039925700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888039925780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888039925800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888039925880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888039925900: 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 a6 8c 69 f6 call 0xf6698cb9
13: 48 89 df mov %rbx,%rdi
16: e8 8e da 69 f6 call 0xf669daa9
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 45 29 5a f6 call 0xf65a2979
34: 65 8b 05 3e ba 6a 08 mov %gs:0x86aba3e(%rip),%eax # 0x86aba79
3b: 85 c0 test %eax,%eax
3d: 74 16 je 0x55
3f: 5b pop %rbx