Bluetooth: hci0: command tx timeout
sysfs: cannot create duplicate filename '/devices/virtual/bluetooth/hci0/hci0:201'
CPU: 0 UID: 0 PID: 47 Comm: kworker/u5:0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: hci0 hci_rx_work
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 sysfs_warn_dup fs/sysfs/dir.c:30 [inline]
 sysfs_create_dir_ns+0x259/0x280 fs/sysfs/dir.c:63
 create_dir lib/kobject.c:73 [inline]
 kobject_add_internal+0x6ab/0xcc0 lib/kobject.c:240
 kobject_add_varg lib/kobject.c:374 [inline]
 kobject_add+0x155/0x220 lib/kobject.c:426
 device_add+0x408/0xb80 drivers/base/core.c:3627
 hci_conn_add_sysfs+0xd5/0x210 net/bluetooth/hci_sysfs.c:48
 le_conn_complete_evt+0xf1d/0x1420 net/bluetooth/hci_event.c:5816
 hci_le_conn_complete_evt+0x187/0x480 net/bluetooth/hci_event.c:5847
 hci_event_func net/bluetooth/hci_event.c:7716 [inline]
 hci_event_packet+0x78f/0x1260 net/bluetooth/hci_event.c:7773
 hci_rx_work+0x3ee/0x1060 net/bluetooth/hci_core.c:4076
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>
kobject: kobject_add_internal failed for hci0:201 with -EEXIST, don't try to register things with the same name in the same directory.
Bluetooth: hci0: failed to register connection device
==================================================================
BUG: KASAN: slab-use-after-free in l2cap_conn_ready net/bluetooth/l2cap_core.c:1624 [inline]
BUG: KASAN: slab-use-after-free in l2cap_connect_cfm+0x6d0/0x10e0 net/bluetooth/l2cap_core.c:7305
Read of size 8 at addr ffff8880399c8480 by task kworker/u5:0/47

CPU: 0 UID: 0 PID: 47 Comm: kworker/u5:0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: hci0 hci_rx_work
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:378 [inline]
 print_report+0xca/0x240 mm/kasan/report.c:482
 kasan_report+0x118/0x150 mm/kasan/report.c:595
 l2cap_conn_ready net/bluetooth/l2cap_core.c:1624 [inline]
 l2cap_connect_cfm+0x6d0/0x10e0 net/bluetooth/l2cap_core.c:7305
 hci_connect_cfm+0x95/0x140 include/net/bluetooth/hci_core.h:2131
 le_conn_complete_evt+0xf65/0x1420 net/bluetooth/hci_event.c:5821
 hci_le_conn_complete_evt+0x187/0x480 net/bluetooth/hci_event.c:5847
 hci_event_func net/bluetooth/hci_event.c:7716 [inline]
 hci_event_packet+0x78f/0x1260 net/bluetooth/hci_event.c:7773
 hci_rx_work+0x3ee/0x1060 net/bluetooth/hci_core.c:4076
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246
 </TASK>

Allocated by task 47:
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 poison_kmalloc_redzone mm/kasan/common.c:397 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:414
 kasan_kmalloc include/linux/kasan.h:262 [inline]
 __kmalloc_cache_noprof+0x3e2/0x700 mm/slub.c:5771
 kmalloc_noprof include/linux/slab.h:957 [inline]
 kzalloc_noprof include/linux/slab.h:1094 [inline]
 l2cap_chan_create+0x51/0x790 net/bluetooth/l2cap_core.c:445
 l2cap_sock_alloc net/bluetooth/l2cap_sock.c:1906 [inline]
 l2cap_sock_new_connection_cb+0x182/0x2e0 net/bluetooth/l2cap_sock.c:1485
 l2cap_connect_cfm+0x367/0x10e0 net/bluetooth/l2cap_core.c:7288
 hci_connect_cfm+0x95/0x140 include/net/bluetooth/hci_core.h:2131
 le_conn_complete_evt+0xf65/0x1420 net/bluetooth/hci_event.c:5821
 hci_le_conn_complete_evt+0x187/0x480 net/bluetooth/hci_event.c:5847
 hci_event_func net/bluetooth/hci_event.c:7716 [inline]
 hci_event_packet+0x78f/0x1260 net/bluetooth/hci_event.c:7773
 hci_rx_work+0x3ee/0x1060 net/bluetooth/hci_core.c:4076
 process_one_work kernel/workqueue.c:3257 [inline]
 process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421
 kthread+0x711/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x599/0xb30 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246

Freed by task 5335:
 kasan_save_stack mm/kasan/common.c:56 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:77
 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
 poison_slab_object mm/kasan/common.c:252 [inline]
 __kasan_slab_free+0x5c/0x80 mm/kasan/common.c:284
 kasan_slab_free include/linux/kasan.h:234 [inline]
 slab_free_hook mm/slub.c:2540 [inline]
 slab_free mm/slub.c:6663 [inline]
 kfree+0x1c0/0x660 mm/slub.c:6871
 l2cap_sock_cleanup_listen+0xf0/0x450 net/bluetooth/l2cap_sock.c:1468
 l2cap_sock_release+0x6a/0x230 net/bluetooth/l2cap_sock.c:1426
 __sock_release net/socket.c:662 [inline]
 sock_close+0xc3/0x240 net/socket.c:1455
 __fput+0x44c/0xa70 fs/file_table.c:468
 task_work_run+0x1d4/0x260 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:44 [inline]
 exit_to_user_mode_loop+0xff/0x4f0 kernel/entry/common.c:75
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode_work include/linux/entry-common.h:159 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:194 [inline]
 do_syscall_64+0x2e3/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff8880399c8000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1152 bytes inside of
 freed 2048-byte region [ffff8880399c8000, ffff8880399c8800)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x399c8
head: order:3 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0x4fff00000000040(head|node=1|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 04fff00000000040 ffff88801a442000 ffffea000110bc00 dead000000000002
raw: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
head: 04fff00000000040 ffff88801a442000 ffffea000110bc00 dead000000000002
head: 0000000000000000 0000000080080008 00000000f5000000 0000000000000000
head: 04fff00000000003 ffffea0000e67201 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000008
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 5176, tgid 5176 (dhcpcd), ts 57643703430, free_ts 56303757476
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x234/0x290 mm/page_alloc.c:1846
 prep_new_page mm/page_alloc.c:1854 [inline]
 get_page_from_freelist+0x2365/0x2440 mm/page_alloc.c:3915
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:5210
 alloc_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2486
 alloc_slab_page mm/slub.c:3075 [inline]
 allocate_slab+0x86/0x3b0 mm/slub.c:3248
 new_slab mm/slub.c:3302 [inline]
 ___slab_alloc+0xf2b/0x1960 mm/slub.c:4651
 __slab_alloc+0x65/0x100 mm/slub.c:4774
 __slab_alloc_node mm/slub.c:4850 [inline]
 slab_alloc_node mm/slub.c:5246 [inline]
 __do_kmalloc_node mm/slub.c:5651 [inline]
 __kmalloc_node_track_caller_noprof+0x5d4/0x820 mm/slub.c:5759
 kmemdup_noprof mm/util.c:138 [inline]
 kmemdup_noprof include/linux/fortify-string.h:765 [inline]
 kmemdup_array+0x3f/0x80 mm/util.c:158
 bpf_migrate_filter net/core/filter.c:1286 [inline]
 bpf_prepare_filter+0xd67/0x12c0 net/core/filter.c:1372
 bpf_prog_create_from_user+0x2c8/0x440 net/core/filter.c:1466
 seccomp_prepare_filter kernel/seccomp.c:701 [inline]
 seccomp_prepare_user_filter kernel/seccomp.c:738 [inline]
 seccomp_set_mode_filter kernel/seccomp.c:1990 [inline]
 do_seccomp+0x7b1/0xd90 kernel/seccomp.c:2110
 __do_sys_prctl kernel/sys.c:2610 [inline]
 __se_sys_prctl+0xc3c/0x1830 kernel/sys.c:2518
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
page last free pid 5143 tgid 5143 stack trace:
 reset_page_owner include/linux/page_owner.h:25 [inline]
 free_pages_prepare mm/page_alloc.c:1395 [inline]
 __free_frozen_pages+0xbc8/0xd30 mm/page_alloc.c:2943
 discard_slab mm/slub.c:3346 [inline]
 __put_partials+0x146/0x170 mm/slub.c:3886
 put_cpu_partial+0x1f2/0x2d0 mm/slub.c:3961
 __slab_free+0x288/0x2a0 mm/slub.c:5947
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x97/0x100 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:349
 kasan_slab_alloc include/linux/kasan.h:252 [inline]
 slab_post_alloc_hook mm/slub.c:4948 [inline]
 slab_alloc_node mm/slub.c:5258 [inline]
 kmem_cache_alloc_noprof+0x37d/0x710 mm/slub.c:5265
 anon_vma_chain_alloc mm/rmap.c:141 [inline]
 __anon_vma_prepare+0xcb/0x4a0 mm/rmap.c:194
 __vmf_anon_prepare mm/memory.c:3673 [inline]
 vmf_anon_prepare mm/internal.h:432 [inline]
 do_cow_fault mm/memory.c:5775 [inline]
 do_fault mm/memory.c:5891 [inline]
 do_pte_missing+0x2e38/0x3330 mm/memory.c:4401
 handle_pte_fault mm/memory.c:6273 [inline]
 __handle_mm_fault mm/memory.c:6411 [inline]
 handle_mm_fault+0x1b26/0x32b0 mm/memory.c:6580
 do_user_addr_fault+0xa7c/0x1380 arch/x86/mm/fault.c:1336
 handle_page_fault arch/x86/mm/fault.c:1476 [inline]
 exc_page_fault+0x82/0x100 arch/x86/mm/fault.c:1532
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:618

Memory state around the buggy address:
 ffff8880399c8380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880399c8400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8880399c8480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff8880399c8500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880399c8580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================