syzbot

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sysfs group 'byte_queue_limits' not found for kobject 'tx-0'
WARNING: CPU: 0 PID: 4484 at fs/sysfs/group.c:280 sysfs_remove_group+0x174/0x288 fs/sysfs/group.c:278
Modules linked in:
CPU: 0 PID: 4484 Comm: kbnepd bnep0 Not tainted 6.1.119-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : sysfs_remove_group+0x174/0x288 fs/sysfs/group.c:278
lr : sysfs_remove_group+0x174/0x288 fs/sysfs/group.c:278
sp : ffff8000216c7840
x29: ffff8000216c7840 x28: 1fffe00019f570ca x27: 1fffe00019f57088
x26: 0000000000000000 x25: 00000000ffffffff x24: 1ffff00002874750
x23: dfff800000000000 x22: dfff800000000000 x21: ffff0000d234fc20
x20: ffff0000ce3add98 x19: ffff8000143a4160 x18: ffff8000216c6c40
x17: 0000000000000000 x16: ffff800012272b80 x15: 0000000000000000
x14: 00000000ffffffff x13: 0000000000000001 x12: 0000000000000001
x11: 0000000000ff0100 x10: 0000000000000000 x9 : 2b7eec1baef2e800
x8 : 2b7eec1baef2e800 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff8000216c7138 x4 : ffff800015b630e0 x3 : ffff800008349710
x2 : 0000000000000001 x1 : 0000000100000000 x0 : 0000000000000000
Call trace:
 sysfs_remove_group+0x174/0x288 fs/sysfs/group.c:278
 netdev_queue_update_kobjects+0x3d4/0x470 net/core/net-sysfs.c:1729
 remove_queue_kobjects net/core/net-sysfs.c:1828 [inline]
 netdev_unregister_kobject+0x100/0x204 net/core/net-sysfs.c:1981
 unregister_netdevice_many+0x11b8/0x175c net/core/dev.c:10917
 unregister_netdevice_queue net/core/dev.c:10821 [inline]
 unregister_netdevice include/linux/netdevice.h:3045 [inline]
 unregister_netdev+0x178/0x1f0 net/core/dev.c:10949
 bnep_session+0x23c4/0x2584 net/bluetooth/bnep/core.c:525
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864
irq event stamp: 6652
hardirqs last  enabled at (6651): [<ffff80000833eab0>] __up_console_sem+0xb4/0x100 kernel/printk/printk.c:261
hardirqs last disabled at (6652): [<ffff800012320d2c>] el1_dbg+0x24/0x80 arch/arm64/kernel/entry-common.c:405
softirqs last  enabled at (6646): [<ffff8000081c1c58>] softirq_handle_end kernel/softirq.c:414 [inline]
softirqs last  enabled at (6646): [<ffff8000081c1c58>] handle_softirqs+0xb84/0xd58 kernel/softirq.c:599
softirqs last disabled at (6637): [<ffff800008020174>] __do_softirq+0x14/0x20 kernel/softirq.c:605
---[ end trace 0000000000000000 ]---
==================================================================
BUG: KASAN: use-after-free in device_for_each_child+0xa8/0x174 drivers/base/core.c:4015
Read of size 8 at addr ffff0000ccf194b8 by task kbnepd bnep0/4484

CPU: 0 PID: 4484 Comm: kbnepd bnep0 Tainted: G        W          6.1.119-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 print_address_description mm/kasan/report.c:284 [inline]
 print_report+0x174/0x4c0 mm/kasan/report.c:395
 kasan_report+0xd4/0x130 mm/kasan/report.c:495
 __asan_report_load8_noabort+0x2c/0x38 mm/kasan/report_generic.c:351
 device_for_each_child+0xa8/0x174 drivers/base/core.c:4015
 pm_runtime_set_memalloc_noio+0xf0/0x210 drivers/base/power/runtime.c:246
 netdev_unregister_kobject+0x144/0x204 net/core/net-sysfs.c:1983
 unregister_netdevice_many+0x11b8/0x175c net/core/dev.c:10917
 unregister_netdevice_queue net/core/dev.c:10821 [inline]
 unregister_netdevice include/linux/netdevice.h:3045 [inline]
 unregister_netdev+0x178/0x1f0 net/core/dev.c:10949
 bnep_session+0x23c4/0x2584 net/bluetooth/bnep/core.c:525
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864

Allocated by task 4411:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:52
 kasan_save_alloc_info+0x24/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:374 [inline]
 __kasan_kmalloc+0xac/0xc4 mm/kasan/common.c:383
 kasan_kmalloc include/linux/kasan.h:211 [inline]
 __do_kmalloc_node mm/slab_common.c:936 [inline]
 __kmalloc+0xd8/0x1c4 mm/slab_common.c:949
 kmalloc include/linux/slab.h:562 [inline]
 kzalloc include/linux/slab.h:693 [inline]
 hci_alloc_dev_priv+0x30/0x18a8 net/bluetooth/hci_core.c:2436
 hci_alloc_dev include/net/bluetooth/hci_core.h:1469 [inline]
 __vhci_create_device drivers/bluetooth/hci_vhci.c:308 [inline]
 vhci_create_device+0xf8/0x6d0 drivers/bluetooth/hci_vhci.c:379
 vhci_get_user drivers/bluetooth/hci_vhci.c:436 [inline]
 vhci_write+0x318/0x3b8 drivers/bluetooth/hci_vhci.c:516
 call_write_iter include/linux/fs.h:2265 [inline]
 new_sync_write fs/read_write.c:491 [inline]
 vfs_write+0x610/0x91c fs/read_write.c:584
 ksys_write+0x15c/0x26c fs/read_write.c:637
 __do_sys_write fs/read_write.c:649 [inline]
 __se_sys_write fs/read_write.c:646 [inline]
 __arm64_sys_write+0x7c/0x90 fs/read_write.c:646
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x168 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

Freed by task 4411:
 kasan_save_stack mm/kasan/common.c:45 [inline]
 kasan_set_track+0x4c/0x80 mm/kasan/common.c:52
 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:516
 ____kasan_slab_free+0x144/0x1c0 mm/kasan/common.c:236
 __kasan_slab_free+0x18/0x28 mm/kasan/common.c:244
 kasan_slab_free include/linux/kasan.h:177 [inline]
 slab_free_hook mm/slub.c:1724 [inline]
 slab_free_freelist_hook mm/slub.c:1750 [inline]
 slab_free mm/slub.c:3661 [inline]
 __kmem_cache_free+0x2c0/0x4b4 mm/slub.c:3674
 kfree+0xcc/0x1b8 mm/slab_common.c:988
 hci_release_dev+0x1040/0x11a8 net/bluetooth/hci_core.c:2766
 bt_host_release+0x70/0x88 net/bluetooth/hci_sysfs.c:92
 device_release+0x8c/0x1ac
 kobject_cleanup lib/kobject.c:681 [inline]
 kobject_release lib/kobject.c:712 [inline]
 kref_put include/linux/kref.h:65 [inline]
 kobject_put+0x2a8/0x41c lib/kobject.c:729
 put_device+0x28/0x40 drivers/base/core.c:3797
 hci_free_dev+0x24/0x34 net/bluetooth/hci_core.c:2559
 vhci_release+0x84/0xcc drivers/bluetooth/hci_vhci.c:574
 __fput+0x1c8/0x7c8 fs/file_table.c:320
 ____fput+0x20/0x30 fs/file_table.c:348
 task_work_run+0x240/0x2f0 kernel/task_work.c:203
 exit_task_work include/linux/task_work.h:39 [inline]
 do_exit+0x554/0x1a88 kernel/exit.c:871
 do_group_exit+0x194/0x22c kernel/exit.c:1021
 get_signal+0x14a0/0x158c kernel/signal.c:2871
 do_signal arch/arm64/kernel/signal.c:1076 [inline]
 do_notify_resume+0x388/0x2cb8 arch/arm64/kernel/signal.c:1129
 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline]
 exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline]
 el0_svc+0x9c/0x168 arch/arm64/kernel/entry-common.c:638
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585

Last potentially related work creation:
 kasan_save_stack+0x40/0x70 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:486
 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496
 insert_work+0x64/0x384 kernel/workqueue.c:1361
 __queue_work+0xd48/0x136c kernel/workqueue.c:1520
 queue_work_on+0xc0/0x16c kernel/workqueue.c:1548
 queue_work include/linux/workqueue.h:512 [inline]
 hci_send_acl+0x904/0xc48 net/bluetooth/hci_core.c:3225
 l2cap_do_send+0x238/0x350
 l2cap_chan_send+0x190c/0x1e5c
 l2cap_sock_sendmsg+0x184/0x2a8 net/bluetooth/l2cap_sock.c:1162
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 sock_sendmsg net/socket.c:753 [inline]
 kernel_sendmsg+0x1c8/0x2a0 net/socket.c:777
 bnep_tx_frame net/bluetooth/bnep/core.c:466 [inline]
 bnep_session+0x1f28/0x2584 net/bluetooth/bnep/core.c:509
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864

Second to last potentially related work creation:
 kasan_save_stack+0x40/0x70 mm/kasan/common.c:45
 __kasan_record_aux_stack+0xcc/0xe8 mm/kasan/generic.c:486
 kasan_record_aux_stack_noalloc+0x14/0x20 mm/kasan/generic.c:496
 insert_work+0x64/0x384 kernel/workqueue.c:1361
 __queue_work+0xd48/0x136c kernel/workqueue.c:1520
 queue_work_on+0xc0/0x16c kernel/workqueue.c:1548
 queue_work include/linux/workqueue.h:512 [inline]
 hci_send_acl+0x904/0xc48 net/bluetooth/hci_core.c:3225
 l2cap_do_send+0x238/0x350
 l2cap_chan_send+0x190c/0x1e5c
 l2cap_sock_sendmsg+0x184/0x2a8 net/bluetooth/l2cap_sock.c:1162
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 sock_sendmsg net/socket.c:753 [inline]
 kernel_sendmsg+0x1c8/0x2a0 net/socket.c:777
 bnep_tx_frame net/bluetooth/bnep/core.c:466 [inline]
 bnep_session+0x1f28/0x2584 net/bluetooth/bnep/core.c:509
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864

The buggy address belongs to the object at ffff0000ccf18000
 which belongs to the cache kmalloc-8k of size 8192
The buggy address is located 5304 bytes inside of
 8192-byte region [ffff0000ccf18000, ffff0000ccf1a000)

The buggy address belongs to the physical page:
page:000000006fb8db62 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff0000ccf1c000 pfn:0x10cf18
head:000000006fb8db62 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x5ffc00000010200(slab|head|node=0|zone=2|lastcpupid=0x7ff)
raw: 05ffc00000010200 fffffc00036da208 fffffc00036a0808 ffff0000c0002c00
raw: ffff0000ccf1c000 0000000000020001 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff0000ccf19380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000ccf19400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff0000ccf19480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                                        ^
 ffff0000ccf19500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff0000ccf19580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
================================================================================
UBSAN: array-index-out-of-bounds in kernel/locking/qspinlock.c:131:9
index 13863 is out of range for type 'unsigned long[8]'
CPU: 1 PID: 4484 Comm: kbnepd bnep0 Tainted: G    B   W          6.1.119-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call trace:
 dump_backtrace+0x1c8/0x1f4 arch/arm64/kernel/stacktrace.c:158
 show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:165
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x108/0x170 lib/dump_stack.c:106
 dump_stack+0x1c/0x58 lib/dump_stack.c:113
 ubsan_epilogue lib/ubsan.c:151 [inline]
 __ubsan_handle_out_of_bounds+0xfc/0x148 lib/ubsan.c:282
 decode_tail kernel/locking/qspinlock.c:131 [inline]
 queued_spin_lock_slowpath+0x9fc/0xe48 kernel/locking/qspinlock.c:471
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock+0x330/0x358 kernel/locking/spinlock_debug.c:115
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
 _raw_spin_lock_irqsave+0x74/0xb4 kernel/locking/spinlock.c:162
 klist_next+0x8c/0x2e4 lib/klist.c:382
 next_device drivers/base/core.c:3940 [inline]
 device_for_each_child+0xc0/0x174 drivers/base/core.c:4019
 pm_runtime_set_memalloc_noio+0xf0/0x210 drivers/base/power/runtime.c:246
 netdev_unregister_kobject+0x144/0x204 net/core/net-sysfs.c:1983
 unregister_netdevice_many+0x11b8/0x175c net/core/dev.c:10917
 unregister_netdevice_queue net/core/dev.c:10821 [inline]
 unregister_netdevice include/linux/netdevice.h:3045 [inline]
 unregister_netdev+0x178/0x1f0 net/core/dev.c:10949
 bnep_session+0x23c4/0x2584 net/bluetooth/bnep/core.c:525
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864
================================================================================
Unable to handle kernel paging request at virtual address ffff8000159e7f50
KASAN: probably user-memory-access in range [0x00000000acf3fa80-0x00000000acf3fa87]
Mem abort info:
  ESR = 0x0000000096000047
  EC = 0x25: DABT (current EL), IL = 32 bits
  SET = 0, FnV = 0
  EA = 0, S1PTW = 0
  FSC = 0x07: level 3 translation fault
Data abort info:
  ISV = 0, ISS = 0x00000047
  CM = 0, WnR = 1
swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000001ab212000
[ffff8000159e7f50] pgd=100000023ffff003, p4d=100000023ffff003, pud=100000023fffe003, pmd=100000023fffa003, pte=0000000000000000
Internal error: Oops: 0000000096000047 [#1] PREEMPT SMP
Modules linked in:
CPU: 1 PID: 4484 Comm: kbnepd bnep0 Tainted: G    B   W          6.1.119-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
pstate: 804000c5 (Nzcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : queued_spin_lock_slowpath+0x3f4/0xe48 kernel/locking/qspinlock.c:474
lr : decode_tail kernel/locking/qspinlock.c:131 [inline]
lr : queued_spin_lock_slowpath+0x9fc/0xe48 kernel/locking/qspinlock.c:471
sp : ffff8000216c75a0
x29: ffff8000216c7640 x28: 000000000000d8a1 x27: 1ffff000042d8ec0
x26: dfff800000000000 x25: 1fffe00019047b00 x24: 0000000000080000
x23: ffff0001b3d16f48 x22: ffff8000159e7f50 x21: ffff0001b3d16f40
x20: 1fffe000367a2de8 x19: ffff0000c823d800 x18: 1fffe000367a0576
x17: 3d3d3d3d3d3d3d3d x16: ffff800012325074 x15: 0000000000000000
x14: 00000000ffffffff x13: 0000000000000001 x12: ffff7000030c3ab0
x11: 0000000000ff0100 x10: ffff8000159e7f40 x9 : 0000000000000001
x8 : 0000000000000000 x7 : 0000000000000001 x6 : 0000000000000001
x5 : ffff8000216c6e58 x4 : ffff800015b630e0 x3 : ffff8000081a7abc
x2 : 0000000000000001 x1 : 0000000000000004 x0 : ffff0001b3d16f48
Call trace:
 queued_spin_lock_slowpath+0x3f4/0xe48 kernel/locking/qspinlock.c:477
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock+0x330/0x358 kernel/locking/spinlock_debug.c:115
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
 _raw_spin_lock_irqsave+0x74/0xb4 kernel/locking/spinlock.c:162
 klist_next+0x8c/0x2e4 lib/klist.c:382
 next_device drivers/base/core.c:3940 [inline]
 device_for_each_child+0xc0/0x174 drivers/base/core.c:4019
 pm_runtime_set_memalloc_noio+0xf0/0x210 drivers/base/power/runtime.c:246
 netdev_unregister_kobject+0x144/0x204 net/core/net-sysfs.c:1983
 unregister_netdevice_many+0x11b8/0x175c net/core/dev.c:10917
 unregister_netdevice_queue net/core/dev.c:10821 [inline]
 unregister_netdevice include/linux/netdevice.h:3045 [inline]
 unregister_netdev+0x178/0x1f0 net/core/dev.c:10949
 bnep_session+0x23c4/0x2584 net/bluetooth/bnep/core.c:525
 kthread+0x250/0x2d8 kernel/kthread.c:376
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:864
Code: aa1603e0 976c7a11 aa1703e0 52800081 (f90002d5) 
---[ end trace 0000000000000000 ]---
----------------
Code disassembly (best guess):
   0:	aa1603e0 	mov	x0, x22
   4:	976c7a11 	bl	0xfffffffffdb1e848
   8:	aa1703e0 	mov	x0, x23
   c:	52800081 	mov	w1, #0x4                   	// #4
* 10:	f90002d5 	str	x21, [x22] <-- trapping instruction