==================================================================
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 ffff888026f27418 by task syz.0.186/6747
CPU: 3 UID: 0 PID: 6747 Comm: syz.0.186 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:3254
__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:lock_acquire+0x5e/0x380 kernel/locking/lockdep.c:5872
Code: 05 3b ab 28 12 83 f8 07 0f 87 f0 00 00 00 48 0f a3 05 06 9e f4 0e 0f 82 c2 02 00 00 8b 35 ee d1 f4 0e 85 f6 0f 85 dd 00 00 00 <48> 8b 44 24 30 65 48 2b 05 dd aa 28 12 0f 85 02 03 00 00 48 83 c4
RSP: 0018:ffffc90004306908 EFLAGS: 00000206
RAX: 0000000000000046 RBX: 0000000000000000 RCX: 0000000000000006
RDX: 0000000000000000 RSI: ffffffff8de4ec23 RDI: ffffffff8c1afaa0
RBP: ffffffff8e7e7520 R08: 00000000e24ebdd4 R09: 000000000000001e
R10: 0000000000000200 R11: 0000000000000000 R12: 0000000000000002
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
rcu_read_lock_sched include/linux/rcupdate.h:948 [inline]
pfn_valid include/linux/mmzone.h:2197 [inline]
page_table_check_set+0x6b/0xa10 mm/page_table_check.c:105
__page_table_check_ptes_set+0x27a/0x4e0 mm/page_table_check.c:215
page_table_check_ptes_set include/linux/page_table_check.h:83 [inline]
set_ptes include/linux/pgtable.h:413 [inline]
set_pte_range+0x936/0xb10 mm/memory.c:5527
filemap_map_order0_folio mm/filemap.c:3861 [inline]
filemap_map_pages+0x7ea/0x2020 mm/filemap.c:3926
do_fault_around mm/memory.c:5757 [inline]
do_read_fault mm/memory.c:5790 [inline]
do_fault+0x9e5/0x1950 mm/memory.c:5933
do_pte_missing mm/memory.c:4477 [inline]
handle_pte_fault mm/memory.c:6317 [inline]
__handle_mm_fault+0x180f/0x2b60 mm/memory.c:6455
handle_mm_fault+0x36d/0xa20 mm/memory.c:6624
faultin_page mm/gup.c:1126 [inline]
__get_user_pages+0xf9c/0x34d0 mm/gup.c:1428
__get_user_pages_locked mm/gup.c:1692 [inline]
get_dump_page+0x27e/0x3d0 mm/gup.c:2192
dump_user_range+0x18d/0xb50 fs/coredump.c:1367
elf_core_dump+0x2d5f/0x3d10 fs/binfmt_elf.c:2110
coredump_write fs/coredump.c:1050 [inline]
do_coredump fs/coredump.c:1127 [inline]
vfs_coredump+0x27bc/0x5570 fs/coredump.c:1201
get_signal+0x1f2a/0x21e0 kernel/signal.c:3019
arch_do_signal_or_restart+0x91/0x7a0 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
exit_to_user_mode_loop kernel/entry/common.c:98 [inline]
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:270 [inline]
irqentry_exit_to_user_mode include/linux/irq-entry-common.h:339 [inline]
irqentry_exit+0x1f8/0x670 kernel/entry/common.c:219
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618
RIP: 0033:0x7f6c5a59c7a1
Code: 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 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f
RSP: 002b:0000200000000000 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007f6c5a815fa0 RCX: 00007f6c5a59c799
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000001144280
RBP: 00007f6c5a632c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007f6c5a816038 R14: 00007f6c5a815fa0 R15: 00007fff62269c38
Allocated by task 6751:
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:950 [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:3763 [inline]
do_new_mount fs/namespace.c:3839 [inline]
path_mount+0x7d0/0x23d0 fs/namespace.c:4159
do_mount fs/namespace.c:4172 [inline]
__do_sys_mount fs/namespace.c:4361 [inline]
__se_sys_mount fs/namespace.c:4338 [inline]
__x64_sys_mount+0x293/0x310 fs/namespace.c:4338
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task 6751:
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:2692 [inline]
slab_free mm/slub.c:6168 [inline]
kfree+0x1f6/0x6b0 mm/slub.c:6486
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:3763 [inline]
do_new_mount fs/namespace.c:3839 [inline]
path_mount+0x7d0/0x23d0 fs/namespace.c:4159
do_mount fs/namespace.c:4172 [inline]
__do_sys_mount fs/namespace.c:4361 [inline]
__se_sys_mount fs/namespace.c:4338 [inline]
__x64_sys_mount+0x293/0x310 fs/namespace.c:4338
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
The buggy address belongs to the object at ffff888026f27400
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 24 bytes inside of
freed 512-byte region [ffff888026f27400, ffff888026f27600)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x26f24
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 0000000800100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801b842c80 dead000000000100 dead000000000122
head: 0000000000000000 0000000800100010 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea00009bc901 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 1, tgid 1 (swapper/0), ts 13974921224, free_ts 0
set_page_owner include/linux/page_owner.h:32 [inline]
post_alloc_hook+0x153/0x170 mm/page_alloc.c:1889
prep_new_page mm/page_alloc.c:1897 [inline]
get_page_from_freelist+0x111d/0x3140 mm/page_alloc.c:3962
__alloc_frozen_pages_noprof+0x27c/0x2ba0 mm/page_alloc.c:5250
alloc_slab_page mm/slub.c:3296 [inline]
allocate_slab mm/slub.c:3485 [inline]
new_slab+0xa6/0x6c0 mm/slub.c:3543
refill_objects+0x26b/0x400 mm/slub.c:7178
refill_sheaf mm/slub.c:2818 [inline]
alloc_full_sheaf mm/slub.c:2839 [inline]
__pcs_replace_empty_main+0x1ab/0x600 mm/slub.c:4629
alloc_from_pcs mm/slub.c:4720 [inline]
slab_alloc_node mm/slub.c:4854 [inline]
__kmalloc_cache_noprof+0x493/0x6f0 mm/slub.c:5378
kmalloc_noprof include/linux/slab.h:950 [inline]
drm_atomic_helper_connector_duplicate_state+0x72/0xd0 drivers/gpu/drm/drm_atomic_state_helper.c:668
drm_atomic_get_connector_state+0x401/0x8f0 drivers/gpu/drm/drm_atomic.c:1309
update_output_state drivers/gpu/drm/drm_atomic.c:1866 [inline]
__drm_atomic_helper_set_config+0x991/0xee0 drivers/gpu/drm/drm_atomic.c:1968
drm_client_modeset_commit_atomic+0x53d/0x7e0 drivers/gpu/drm/drm_client_modeset.c:1085
drm_client_modeset_commit_locked+0x14d/0x580 drivers/gpu/drm/drm_client_modeset.c:1207
drm_client_modeset_commit+0x4f/0x80 drivers/gpu/drm/drm_client_modeset.c:1233
__drm_fb_helper_restore_fbdev_mode_unlocked.part.0+0x137/0x160 drivers/gpu/drm/drm_fb_helper.c:137
__drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:1177 [inline]
drm_fb_helper_set_par+0x15a/0x1b0 drivers/gpu/drm/drm_fb_helper.c:1179
fbcon_init+0x139c/0x1820 drivers/video/fbdev/core/fbcon.c:1147
page_owner free stack trace missing
Memory state around the buggy address:
ffff888026f27300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff888026f27380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888026f27400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888026f27480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888026f27500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
----------------
Code disassembly (best guess):
0: 05 3b ab 28 12 add $0x1228ab3b,%eax
5: 83 f8 07 cmp $0x7,%eax
8: 0f 87 f0 00 00 00 ja 0xfe
e: 48 0f a3 05 06 9e f4 bt %rax,0xef49e06(%rip) # 0xef49e1c
15: 0e
16: 0f 82 c2 02 00 00 jb 0x2de
1c: 8b 35 ee d1 f4 0e mov 0xef4d1ee(%rip),%esi # 0xef4d210
22: 85 f6 test %esi,%esi
24: 0f 85 dd 00 00 00 jne 0x107
* 2a: 48 8b 44 24 30 mov 0x30(%rsp),%rax <-- trapping instruction
2f: 65 48 2b 05 dd aa 28 sub %gs:0x1228aadd(%rip),%rax # 0x1228ab14
36: 12
37: 0f 85 02 03 00 00 jne 0x33f
3d: 48 rex.W
3e: 83 .byte 0x83
3f: c4 .byte 0xc4