syzbot

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BUG: KASAN: use-after-free in debug_spin_unlock kernel/locking/spinlock_debug.c:97 [inline]
BUG: KASAN: use-after-free in do_raw_spin_unlock+0x1f7/0x230 kernel/locking/spinlock_debug.c:138
Read of size 4 at addr ffff8881154723e4 by task syz-executor.4/15008

CPU: 1 PID: 15008 Comm: syz-executor.4 Not tainted 5.13.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x143/0x1db lib/dump_stack.c:120
 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:233
 __kasan_report mm/kasan/report.c:419 [inline]
 kasan_report.cold+0x7c/0xd8 mm/kasan/report.c:436
 debug_spin_unlock kernel/locking/spinlock_debug.c:97 [inline]
 do_raw_spin_unlock+0x1f7/0x230 kernel/locking/spinlock_debug.c:138
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:159 [inline]
 _raw_spin_unlock_irqrestore+0x1e/0x50 kernel/locking/spinlock.c:191
 fn_hold+0xbd/0xe0 drivers/tty/vt/keyboard.c:521
 k_spec drivers/tty/vt/keyboard.c:660 [inline]
 k_spec+0xe1/0x130 drivers/tty/vt/keyboard.c:649
 kbd_keycode drivers/tty/vt/keyboard.c:1512 [inline]
 kbd_event+0xc64/0x1750 drivers/tty/vt/keyboard.c:1531
 input_to_handler+0x3b9/0x4c0 drivers/input/input.c:118
 input_pass_values.part.0+0x28d/0x700 drivers/input/input.c:145
 input_pass_values drivers/input/input.c:134 [inline]
 input_handle_event+0x373/0x1440 drivers/input/input.c:404
 input_inject_event+0x2fe/0x320 drivers/input/input.c:476
 evdev_write+0x430/0x760 drivers/input/evdev.c:530
 vfs_write+0x28e/0x9e0 fs/read_write.c:603
 ksys_write+0x1ee/0x250 fs/read_write.c:658
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665d9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9098d61188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9
RDX: 0000000000035000 RSI: 0000000020000040 RDI: 0000000000000003
RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffc3c4e6e1f R14: 00007f9098d61300 R15: 0000000000022000

Allocated by task 1:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:428 [inline]
 ____kasan_kmalloc mm/kasan/common.c:507 [inline]
 __kasan_kmalloc+0x7c/0x90 mm/kasan/common.c:516
 kmalloc include/linux/slab.h:556 [inline]
 kzalloc include/linux/slab.h:686 [inline]
 alloc_tty_struct+0x95/0x920 drivers/tty/tty_io.c:3122
 tty_init_dev.part.0+0x20/0x610 drivers/tty/tty_io.c:1430
 tty_init_dev include/linux/err.h:36 [inline]
 tty_open_by_driver drivers/tty/tty_io.c:2102 [inline]
 tty_open+0xb16/0x1000 drivers/tty/tty_io.c:2150
 chrdev_open+0x266/0x770 fs/char_dev.c:414
 do_dentry_open+0x4b4/0x1090 fs/open.c:826
 do_open fs/namei.c:3361 [inline]
 path_openat+0x1c0e/0x27e0 fs/namei.c:3494
 do_filp_open+0x190/0x3d0 fs/namei.c:3521
 do_sys_openat2+0x16d/0x420 fs/open.c:1187
 do_sys_open fs/open.c:1203 [inline]
 __do_sys_open fs/open.c:1211 [inline]
 __se_sys_open fs/open.c:1207 [inline]
 __x64_sys_open+0x119/0x1c0 fs/open.c:1207
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Freed by task 2211:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:46
 kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:357
 ____kasan_slab_free mm/kasan/common.c:360 [inline]
 ____kasan_slab_free mm/kasan/common.c:325 [inline]
 __kasan_slab_free+0xe0/0x110 mm/kasan/common.c:368
 kasan_slab_free include/linux/kasan.h:212 [inline]
 slab_free_hook mm/slub.c:1581 [inline]
 slab_free_freelist_hook+0xb4/0x1b0 mm/slub.c:1606
 slab_free mm/slub.c:3166 [inline]
 kfree+0xdb/0x3b0 mm/slub.c:4216
 process_one_work+0x98d/0x1580 kernel/workqueue.c:2275
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2421
 kthread+0x38c/0x460 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Last potentially related work creation:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_record_aux_stack+0xc5/0xf0 mm/kasan/generic.c:345
 insert_work+0x48/0x370 kernel/workqueue.c:1331
 __queue_work+0x5c3/0xe70 kernel/workqueue.c:1497
 queue_work_on+0xee/0x110 kernel/workqueue.c:1524
 kref_put include/linux/kref.h:65 [inline]
 tty_kref_put drivers/tty/tty_io.c:1588 [inline]
 release_tty+0x4e9/0x610 drivers/tty/tty_io.c:1625
 tty_release_struct+0xb4/0xe0 drivers/tty/tty_io.c:1724
 tty_release+0xc70/0x1210 drivers/tty/tty_io.c:1884
 __fput+0x288/0x920 fs/file_table.c:280
 task_work_run+0xdd/0x1a0 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
 exit_to_user_mode_prepare+0x218/0x220 kernel/entry/common.c:208
 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:57
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Second to last potentially related work creation:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:38
 kasan_record_aux_stack+0xc5/0xf0 mm/kasan/generic.c:345
 __call_rcu kernel/rcu/tree.c:3038 [inline]
 call_rcu+0xb1/0x800 kernel/rcu/tree.c:3113
 netlink_release+0xd33/0x1c50 net/netlink/af_netlink.c:810
 __sock_release+0xcd/0x280 net/socket.c:599
 sock_close+0x18/0x20 net/socket.c:1258
 __fput+0x288/0x920 fs/file_table.c:280
 task_work_run+0xdd/0x1a0 kernel/task_work.c:164
 exit_task_work include/linux/task_work.h:32 [inline]
 do_exit+0xbfc/0x28d0 kernel/exit.c:826
 do_group_exit+0x125/0x310 kernel/exit.c:923
 __do_sys_exit_group kernel/exit.c:934 [inline]
 __se_sys_exit_group kernel/exit.c:932 [inline]
 __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:932
 do_syscall_64+0x3a/0xb0 arch/x86/entry/common.c:47
 entry_SYSCALL_64_after_hwframe+0x44/0xae

The buggy address belongs to the object at ffff888115472000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 996 bytes inside of
 2048-byte region [ffff888115472000, ffff888115472800)
The buggy address belongs to the page:
page:ffffea0004551c00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x115470
head:ffffea0004551c00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x200000000010200(slab|head|node=0|zone=2)
raw: 0200000000010200 0000000000000000 0000000500000001 ffff888100042000
raw: 0000000000000000 0000000000080008 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 33, ts 121464273406, free_ts 121012814839
 prep_new_page mm/page_alloc.c:2358 [inline]
 get_page_from_freelist+0x1b0c/0x26a0 mm/page_alloc.c:3994
 __alloc_pages+0x1b2/0x4f0 mm/page_alloc.c:5200
 alloc_pages+0x18c/0x2a0 mm/mempolicy.c:2272
 alloc_slab_page mm/slub.c:1644 [inline]
 allocate_slab+0x2c5/0x4c0 mm/slub.c:1784
 new_slab mm/slub.c:1847 [inline]
 new_slab_objects mm/slub.c:2593 [inline]
 ___slab_alloc+0x4bd/0x820 mm/slub.c:2756
 __slab_alloc+0x68/0x80 mm/slub.c:2796
 slab_alloc_node mm/slub.c:2878 [inline]
 __kmalloc_node_track_caller+0x138/0x330 mm/slub.c:4595
 kmalloc_reserve net/core/skbuff.c:354 [inline]
 __alloc_skb+0xde/0x340 net/core/skbuff.c:425
 skb_copy+0x137/0x2f0 net/core/skbuff.c:1562
 kauditd_send_multicast_skb+0x2b0/0x3f0 kernel/audit.c:798
 kauditd_send_queue+0x54/0x210 kernel/audit.c:729
 kauditd_thread+0x813/0xba0 kernel/audit.c:860
 kthread+0x38c/0x460 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:24 [inline]
 free_pages_prepare mm/page_alloc.c:1298 [inline]
 __free_pages_ok+0x488/0xb10 mm/page_alloc.c:1572
 unfreeze_partials+0x17c/0x1d0 mm/slub.c:2374
 put_cpu_partial+0x5b/0x150 mm/slub.c:2410
 qlink_free mm/kasan/quarantine.c:146 [inline]
 qlist_free_all+0x5a/0xc0 mm/kasan/quarantine.c:165
 kasan_quarantine_reduce+0x180/0x200 mm/kasan/quarantine.c:272
 __kasan_slab_alloc+0x73/0x80 mm/kasan/common.c:438
 kasan_slab_alloc include/linux/kasan.h:236 [inline]
 slab_post_alloc_hook mm/slab.h:524 [inline]
 slab_alloc_node mm/slub.c:2912 [inline]
 slab_alloc mm/slub.c:2920 [inline]
 kmem_cache_alloc+0x1d6/0x360 mm/slub.c:2925
 kmem_cache_zalloc include/linux/slab.h:676 [inline]
 alloc_buffer_head+0x20/0x100 fs/buffer.c:3357
 alloc_page_buffers+0x280/0x750 fs/buffer.c:857
 create_empty_buffers+0x2c/0x820 fs/buffer.c:1581
 create_page_buffers+0x2ac/0x3c0 fs/buffer.c:1698
 __block_write_begin_int+0x23a/0x1770 fs/buffer.c:2010
 ext4_da_write_begin+0x397/0xe10 fs/ext4/inode.c:3018
 generic_perform_write+0x20a/0x4f0 mm/filemap.c:3660
 ext4_buffered_write_iter+0x244/0x4d0 fs/ext4/file.c:269
 ext4_file_write_iter+0x3bd/0x1980 fs/ext4/file.c:680

Memory state around the buggy address:
 ffff888115472280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888115472300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888115472380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                                       ^
 ffff888115472400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888115472480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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