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Message-ID: <CACT4Y+Z1jsbVhUC0ZOSnq6evurVrZkA7OGeAeU3kbtXn-C94fQ@mail.gmail.com> Date: Thu, 10 Mar 2016 17:25:25 +0100 From: Dmitry Vyukov <dvyukov@...gle.com> To: Marcel Holtmann <marcel@...tmann.org> Cc: Jiri Slaby <jslaby@...e.cz>, "Gustavo F. Padovan" <gustavo@...ovan.org>, Johan Hedberg <johan.hedberg@...il.com>, linux-bluetooth <linux-bluetooth@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, syzkaller <syzkaller@...glegroups.com>, Kostya Serebryany <kcc@...gle.com>, Alexander Potapenko <glider@...gle.com>, Sasha Levin <sasha.levin@...cle.com> Subject: Re: bluetooth: use-after-free in vhci_send_frame On Tue, Mar 8, 2016 at 7:32 PM, Marcel Holtmann <marcel@...tmann.org> wrote: > Hi Dmitry, > >>>>>> I've got the following use-after-free reports while running syzkaller >>>>>> fuzzer. Unfortunately no reproducer. But this happened when system was >>>>>> busy reacting on sysrq t, so probably some unexpected delay happended. >>>>>> >>>>>> On commit 92e963f50fc74041b5e9e744c330dca48e04f08d. >>>>>> >>>>>> ================================================================== >>>>>> BUG: KASAN: use-after-free in do_raw_spin_unlock+0x228/0x240 at addr >>>>>> ffff88003a8a9ed8 >>>>>> Write of size 8 by task kworker/u12:2/10322 >>>>>> ============================================================================= >>>>>> BUG kmalloc-512 (Tainted: G B ): kasan: bad access detected >>>>>> ----------------------------------------------------------------------------- >>>>>> >>>>>> INFO: Allocated in vhci_open+0x50/0x350 age=6743 cpu=0 pid=10397 >>>>>> [< none >] ___slab_alloc+0x564/0x5b0 mm/slub.c:2470 >>>>>> [< none >] __slab_alloc+0x66/0xc0 mm/slub.c:2499 >>>>>> [< inline >] slab_alloc_node mm/slub.c:2562 >>>>>> [< inline >] slab_alloc mm/slub.c:2604 >>>>>> [< none >] kmem_cache_alloc_trace+0x25c/0x300 mm/slub.c:2621 >>>>>> [< inline >] kmalloc include/linux/slab.h:463 >>>>>> [< inline >] kzalloc include/linux/slab.h:607 >>>>>> [< none >] vhci_open+0x50/0x350 drivers/bluetooth/hci_vhci.c:316 >>>>>> [< none >] misc_open+0x388/0x520 drivers/char/misc.c:153 >>>>>> [< none >] chrdev_open+0x22a/0x4c0 fs/char_dev.c:388 >>>>>> [< none >] do_dentry_open+0x6a2/0xcb0 fs/open.c:736 >>>>>> [< none >] vfs_open+0x17b/0x1f0 fs/open.c:853 >>>>>> [< inline >] do_last fs/namei.c:3254 >>>>>> [< none >] path_openat+0xde9/0x5e30 fs/namei.c:3386 >>>>>> [< none >] do_filp_open+0x18e/0x250 fs/namei.c:3421 >>>>>> [< none >] do_sys_open+0x1fc/0x420 fs/open.c:1022 >>>>>> [< inline >] SYSC_open fs/open.c:1040 >>>>>> [< none >] SyS_open+0x2d/0x40 fs/open.c:1035 >>>>>> [< none >] entry_SYSCALL_64_fastpath+0x16/0x7a >>>>>> arch/x86/entry/entry_64.S:185 >>>>>> >>>>>> INFO: Freed in vhci_release+0xae/0xe0 age=2072 cpu=2 pid=10397 >>>>>> [< none >] __slab_free+0x1fc/0x320 mm/slub.c:2680 >>>>>> [< inline >] slab_free mm/slub.c:2835 >>>>>> [< none >] kfree+0x2ac/0x2c0 mm/slub.c:3664 >>>>>> [< none >] vhci_release+0xae/0xe0 drivers/bluetooth/hci_vhci.c:346 >>>>>> [< none >] __fput+0x236/0x780 fs/file_table.c:208 >>>>>> [< none >] ____fput+0x15/0x20 fs/file_table.c:244 >>>>>> [< none >] task_work_run+0x170/0x210 kernel/task_work.c:115 >>>>>> [< inline >] exit_task_work include/linux/task_work.h:21 >>>>>> [< none >] do_exit+0x8b5/0x2cb0 kernel/exit.c:748 >>>>>> [< none >] do_group_exit+0x108/0x330 kernel/exit.c:878 >>>>>> [< none >] get_signal+0x5e4/0x14f0 kernel/signal.c:2307 >>>>>> [< none >] do_signal+0x83/0x1c90 arch/x86/kernel/signal.c:712 >>>>>> [< none >] exit_to_usermode_loop+0x1a5/0x210 >>>>>> arch/x86/entry/common.c:247 >>>>>> [< inline >] prepare_exit_to_usermode arch/x86/entry/common.c:282 >>>>>> [< none >] syscall_return_slowpath+0x2ba/0x340 >>>>>> arch/x86/entry/common.c:344 >>>>>> [< none >] int_ret_from_sys_call+0x25/0x9f >>>>>> arch/x86/entry/entry_64.S:281 >>>>>> >>>>>> INFO: Slab 0xffffea0000ea2a00 objects=16 used=14 fp=0xffff88003a8a9ec0 >>>>>> flags=0x1fffc0000004080 >>>>>> INFO: Object 0xffff88003a8a9ec0 @offset=7872 fp=0xffff88003a8a9ae8 >>>>>> CPU: 1 PID: 10322 Comm: kworker/u12:2 Tainted: G B 4.5.0-rc1+ #300 >>>>>> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 >>>>>> Workqueue: hci0 hci_cmd_work >>>>>> 00000000ffffffff ffff88003634f9f8 ffffffff82be118d ffff88003e804f00 >>>>>> ffff88003a8a9ec0 ffff88003a8a8000 ffff88003634fa28 ffffffff8175b434 >>>>>> ffff88003e804f00 ffffea0000ea2a00 ffff88003a8a9ec0 0000000000000001 >>>>>> >>>>>> Call Trace: >>>>>> [< inline >] kasan_report mm/kasan/report.c:274 >>>>>> [<ffffffff81764f9e>] __asan_report_store8_noabort+0x3e/0x40 >>>>>> mm/kasan/report.c:300 >>>>>> [< inline >] debug_spin_unlock kernel/locking/spinlock_debug.c:102 >>>>>> [<ffffffff81466608>] do_raw_spin_unlock+0x228/0x240 >>>>>> kernel/locking/spinlock_debug.c:158 >>>>>> [< inline >] __raw_spin_unlock_irqrestore >>>>>> include/linux/spinlock_api_smp.h:161 >>>>>> [<ffffffff86652cf7>] _raw_spin_unlock_irqrestore+0x27/0xc0 >>>>>> kernel/locking/spinlock.c:191 >>>>>> [< inline >] spin_unlock_irqrestore include/linux/spinlock.h:362 >>>>>> [<ffffffff8143975f>] __wake_up+0x3f/0x50 kernel/sched/wait.c:96 >>>>>> [<ffffffff8484b983>] vhci_send_frame+0xc3/0x100 drivers/bluetooth/hci_vhci.c:86 >>>>>> [<ffffffff85d38315>] hci_send_frame+0x1f5/0x310 net/bluetooth/hci_core.c:3316 >>>>>> [<ffffffff85d385bf>] hci_cmd_work+0x18f/0x2e0 net/bluetooth/hci_core.c:4196 >>>>>> [<ffffffff813a2386>] process_one_work+0x796/0x1440 kernel/workqueue.c:2037 >>>>>> [<ffffffff813a310b>] worker_thread+0xdb/0xfc0 kernel/workqueue.c:2171 >>>>>> [<ffffffff813b637f>] kthread+0x23f/0x2d0 drivers/block/aoe/aoecmd.c:1303 >>>>>> [<ffffffff866535ef>] ret_from_fork+0x3f/0x70 arch/x86/entry/entry_64.S:468 >>>>>> ================================================================== >>>>>> >>>>>> ================================================================== >>>>>> BUG: KASAN: use-after-free in do_raw_spin_lock+0x281/0x2b0 at addr >>>>>> ffff88003a8a9f2c >>>>>> Read of size 4 by task kworker/u12:0/3554 >>>>>> ============================================================================= >>>>>> BUG kmalloc-512 (Tainted: G B ): kasan: bad access detected >>>>>> ----------------------------------------------------------------------------- >>>>>> >>>>>> INFO: Allocated in vhci_open+0x50/0x350 age=16305 cpu=0 pid=10397 >>>>>> [< none >] ___slab_alloc+0x564/0x5b0 mm/slub.c:2470 >>>>>> [< none >] __slab_alloc+0x66/0xc0 mm/slub.c:2499 >>>>>> [< inline >] slab_alloc_node mm/slub.c:2562 >>>>>> [< inline >] slab_alloc mm/slub.c:2604 >>>>>> [< none >] kmem_cache_alloc_trace+0x25c/0x300 mm/slub.c:2621 >>>>>> [< inline >] kmalloc include/linux/slab.h:463 >>>>>> [< inline >] kzalloc include/linux/slab.h:607 >>>>>> [< none >] vhci_open+0x50/0x350 drivers/bluetooth/hci_vhci.c:316 >>>>>> [< none >] misc_open+0x388/0x520 drivers/char/misc.c:153 >>>>>> [< none >] chrdev_open+0x22a/0x4c0 fs/char_dev.c:388 >>>>>> [< none >] do_dentry_open+0x6a2/0xcb0 fs/open.c:736 >>>>>> [< none >] vfs_open+0x17b/0x1f0 fs/open.c:853 >>>>>> [< inline >] do_last fs/namei.c:3254 >>>>>> [< none >] path_openat+0xde9/0x5e30 fs/namei.c:3386 >>>>>> [< none >] do_filp_open+0x18e/0x250 fs/namei.c:3421 >>>>>> [< none >] do_sys_open+0x1fc/0x420 fs/open.c:1022 >>>>>> [< inline >] SYSC_open fs/open.c:1040 >>>>>> [< none >] SyS_open+0x2d/0x40 fs/open.c:1035 >>>>>> [< none >] entry_SYSCALL_64_fastpath+0x16/0x7a >>>>>> arch/x86/entry/entry_64.S:185 >>>>>> >>>>>> INFO: Freed in vhci_release+0xae/0xe0 age=11634 cpu=2 pid=10397 >>>>>> [< none >] __slab_free+0x1fc/0x320 mm/slub.c:2680 >>>>>> [< inline >] slab_free mm/slub.c:2835 >>>>>> [< none >] kfree+0x2ac/0x2c0 mm/slub.c:3664 >>>>>> [< none >] vhci_release+0xae/0xe0 drivers/bluetooth/hci_vhci.c:346 >>>>>> [< none >] __fput+0x236/0x780 fs/file_table.c:208 >>>>>> [< none >] ____fput+0x15/0x20 fs/file_table.c:244 >>>>>> [< none >] task_work_run+0x170/0x210 kernel/task_work.c:115 >>>>>> [< inline >] exit_task_work include/linux/task_work.h:21 >>>>>> [< none >] do_exit+0x8b5/0x2cb0 kernel/exit.c:748 >>>>>> [< none >] do_group_exit+0x108/0x330 kernel/exit.c:878 >>>>>> [< none >] get_signal+0x5e4/0x14f0 kernel/signal.c:2307 >>>>>> [< none >] do_signal+0x83/0x1c90 arch/x86/kernel/signal.c:712 >>>>>> [< none >] exit_to_usermode_loop+0x1a5/0x210 >>>>>> arch/x86/entry/common.c:247 >>>>>> [< inline >] prepare_exit_to_usermode arch/x86/entry/common.c:282 >>>>>> [< none >] syscall_return_slowpath+0x2ba/0x340 >>>>>> arch/x86/entry/common.c:344 >>>>>> [< none >] int_ret_from_sys_call+0x25/0x9f >>>>>> arch/x86/entry/entry_64.S:281 >>>>>> >>>>>> INFO: Slab 0xffffea0000ea2a00 objects=16 used=12 fp=0xffff88003a8aaa48 >>>>>> flags=0x1fffc0000004080 >>>>>> INFO: Object 0xffff88003a8a9ec0 @offset=7872 fp=0xffff88003a8a9338 >>>>>> CPU: 0 PID: 3554 Comm: kworker/u12:0 Tainted: G B 4.5.0-rc1+ #300 >>>>>> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 >>>>>> Workqueue: hci0 hci_power_on >>>>>> 00000000ffffffff ffff880036abf838 ffffffff82be118d ffff88003e804f00 >>>>>> ffff88003a8a9ec0 ffff88003a8a8000 ffff880036abf868 ffffffff8175b434 >>>>>> ffff88003e804f00 ffffea0000ea2a00 ffff88003a8a9ec0 ffff880036abfb30 >>>>>> >>>>>> Call Trace: >>>>>> [< inline >] kasan_report mm/kasan/report.c:274 >>>>>> [<ffffffff81764e1e>] __asan_report_load4_noabort+0x3e/0x40 >>>>>> mm/kasan/report.c:294 >>>>>> [< inline >] debug_spin_lock_before kernel/locking/spinlock_debug.c:83 >>>>>> [<ffffffff814662e1>] do_raw_spin_lock+0x281/0x2b0 >>>>>> kernel/locking/spinlock_debug.c:135 >>>>>> [< inline >] __raw_spin_lock_irqsave >>>>>> include/linux/spinlock_api_smp.h:119 >>>>>> [<ffffffff86652bd7>] _raw_spin_lock_irqsave+0xa7/0xd0 >>>>>> kernel/locking/spinlock.c:159 >>>>>> [<ffffffff854da1b2>] skb_dequeue+0x22/0x180 net/core/skbuff.c:2333 >>>>>> [<ffffffff854de656>] skb_queue_purge+0x26/0x40 net/core/skbuff.c:2371 >>>>>> [<ffffffff8484b9fb>] vhci_flush+0x3b/0x50 drivers/bluetooth/hci_vhci.c:74 >>>>>> [<ffffffff85d3a02f>] hci_dev_do_open+0x62f/0xf60 net/bluetooth/hci_core.c:1417 >>>>>> [<ffffffff85d42b98>] hci_power_on+0x108/0x4b0 net/bluetooth/hci_core.c:2027 >>>>>> [<ffffffff813a2386>] process_one_work+0x796/0x1440 kernel/workqueue.c:2037 >>>>>> [<ffffffff813a310b>] worker_thread+0xdb/0xfc0 kernel/workqueue.c:2171 >>>>>> [<ffffffff813b637f>] kthread+0x23f/0x2d0 drivers/block/aoe/aoecmd.c:1303 >>>>>> [<ffffffff866535ef>] ret_from_fork+0x3f/0x70 arch/x86/entry/entry_64.S:468 >>>>>> ================================================================== >>>>>> ================================================================== >>>>>> BUG: KASAN: use-after-free in skb_dequeue+0x153/0x180 at addr ffff88003a8a9f10 >>>>>> Read of size 8 by task kworker/u12:0/3554 >>>>>> ============================================================================= >>>>>> BUG kmalloc-512 (Tainted: G B ): kasan: bad access detected >>>>>> ----------------------------------------------------------------------------- >>>>>> >>>>>> INFO: Allocated in vhci_open+0x50/0x350 age=16913 cpu=0 pid=10397 >>>>>> [< inline >] slab_alloc_node mm/slub.c:2562 >>>>>> [< inline >] slab_alloc mm/slub.c:2604 >>>>>> [< none >] kmem_cache_alloc_trace+0x25c/0x300 mm/slub.c:2621 >>>>>> [< inline >] kmalloc include/linux/slab.h:463 >>>>>> [< inline >] kzalloc include/linux/slab.h:607 >>>>>> [< none >] vhci_open+0x50/0x350 drivers/bluetooth/hci_vhci.c:316 >>>>>> [< none >] misc_open+0x388/0x520 drivers/char/misc.c:153 >>>>>> [< none >] chrdev_open+0x22a/0x4c0 fs/char_dev.c:388 >>>>>> [< none >] do_dentry_open+0x6a2/0xcb0 fs/open.c:736 >>>>>> [< none >] vfs_open+0x17b/0x1f0 fs/open.c:853 >>>>>> [< inline >] do_last fs/namei.c:3254 >>>>>> [< none >] path_openat+0xde9/0x5e30 fs/namei.c:3386 >>>>>> [< none >] do_filp_open+0x18e/0x250 fs/namei.c:3421 >>>>>> [< none >] do_sys_open+0x1fc/0x420 fs/open.c:1022 >>>>>> [< inline >] SYSC_open fs/open.c:1040 >>>>>> [< none >] SyS_open+0x2d/0x40 fs/open.c:1035 >>>>>> [< none >] entry_SYSCALL_64_fastpath+0x16/0x7a >>>>>> arch/x86/entry/entry_64.S:185 >>>>>> >>>>>> INFO: Freed in vhci_release+0xae/0xe0 age=12241 cpu=2 pid=10397 >>>>>> [< inline >] slab_free mm/slub.c:2835 >>>>>> [< none >] kfree+0x2ac/0x2c0 mm/slub.c:3664 >>>>>> [< none >] vhci_release+0xae/0xe0 drivers/bluetooth/hci_vhci.c:346 >>>>>> [< none >] __fput+0x236/0x780 fs/file_table.c:208 >>>>>> [< none >] ____fput+0x15/0x20 fs/file_table.c:244 >>>>>> [< none >] task_work_run+0x170/0x210 kernel/task_work.c:115 >>>>>> [< inline >] exit_task_work include/linux/task_work.h:21 >>>>>> [< none >] do_exit+0x8b5/0x2cb0 kernel/exit.c:748 >>>>>> [< none >] do_group_exit+0x108/0x330 kernel/exit.c:878 >>>>>> [< none >] get_signal+0x5e4/0x14f0 kernel/signal.c:2307 >>>>>> [< none >] do_signal+0x83/0x1c90 arch/x86/kernel/signal.c:712 >>>>>> [< none >] exit_to_usermode_loop+0x1a5/0x210 >>>>>> arch/x86/entry/common.c:247 >>>>>> [< inline >] prepare_exit_to_usermode arch/x86/entry/common.c:282 >>>>>> [< none >] syscall_return_slowpath+0x2ba/0x340 >>>>>> arch/x86/entry/common.c:344 >>>>>> [< none >] int_ret_from_sys_call+0x25/0x9f >>>>>> arch/x86/entry/entry_64.S:281 >>>>>> >>>>>> INFO: Slab 0xffffea0000ea2a00 objects=16 used=12 fp=0xffff88003a8aaa48 >>>>>> flags=0x1fffc0000004080 >>>>>> INFO: Object 0xffff88003a8a9ec0 @offset=7872 fp=0xffff88003a8a9338 >>>>>> CPU: 0 PID: 3554 Comm: kworker/u12:0 Tainted: G B 4.5.0-rc1+ #300 >>>>>> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 >>>>>> Workqueue: hci0 hci_power_on >>>>>> 00000000ffffffff ffff880036abf898 ffffffff82be118d ffff88003e804f00 >>>>>> ffff88003a8a9ec0 ffff88003a8a8000 ffff880036abf8c8 ffffffff8175b434 >>>>>> ffff88003e804f00 ffffea0000ea2a00 ffff88003a8a9ec0 0000000000000282 >>>>>> >>>>>> Call Trace: >>>>>> [< inline >] kasan_report mm/kasan/report.c:274 >>>>>> [<ffffffff81764e5e>] __asan_report_load8_noabort+0x3e/0x40 >>>>>> mm/kasan/report.c:295 >>>>>> [< inline >] skb_peek include/linux/skbuff.h:1453 >>>>>> [< inline >] __skb_dequeue include/linux/skbuff.h:1735 >>>>>> [<ffffffff854da2e3>] skb_dequeue+0x153/0x180 net/core/skbuff.c:2334 >>>>>> [<ffffffff854de656>] skb_queue_purge+0x26/0x40 net/core/skbuff.c:2371 >>>>>> [<ffffffff8484b9fb>] vhci_flush+0x3b/0x50 drivers/bluetooth/hci_vhci.c:74 >>>>>> [<ffffffff85d3a02f>] hci_dev_do_open+0x62f/0xf60 net/bluetooth/hci_core.c:1417 >>>>>> [<ffffffff85d42b98>] hci_power_on+0x108/0x4b0 net/bluetooth/hci_core.c:2027 >>>>>> [<ffffffff813a2386>] process_one_work+0x796/0x1440 kernel/workqueue.c:2037 >>>>>> [<ffffffff813a310b>] worker_thread+0xdb/0xfc0 kernel/workqueue.c:2171 >>>>>> [<ffffffff813b637f>] kthread+0x23f/0x2d0 drivers/block/aoe/aoecmd.c:1303 >>>>>> [<ffffffff866535ef>] ret_from_fork+0x3f/0x70 arch/x86/entry/entry_64.S:468 >>>>>> ================================================================== >>>>> >>>>> >>>>> >>>>> Ping. >>>>> Just got another one on 4.5-rc6 >>>> >>>> FWIW I've just hit that too right now. >>>> >>>> But I haven't hit it with 4.4 which I am fuzzing by the orders of >>>> magnitude longer. But take it with grain of salt -- it could be a >>>> coincidence, of course. >>> >>> do you know what the fuzzer was doing at this point. Is the fuzzer opening /dev/vhci device node? Since that would be the only way to actually get into that driver. >> >> Check out the KASAN reports. They should answer your question. > > that means very little to me actually. So is the real issue caused by opening /dev/vhci or is that theoretical one via some internal kernel compile time feature. This is a real use-after-free bug that actually happened on my machine. The memory was allocated inside of SyS_open syscall which called vhci_open. So, yes, actual opening of /dev/vhci was definitely involved: INFO: Allocated in vhci_open+0x50/0x350 age=6743 cpu=0 pid=10397 [< none >] ___slab_alloc+0x564/0x5b0 mm/slub.c:2470 [< none >] __slab_alloc+0x66/0xc0 mm/slub.c:2499 [< inline >] slab_alloc_node mm/slub.c:2562 [< inline >] slab_alloc mm/slub.c:2604 [< none >] kmem_cache_alloc_trace+0x25c/0x300 mm/slub.c:2621 [< inline >] kmalloc include/linux/slab.h:463 [< inline >] kzalloc include/linux/slab.h:607 [< none >] vhci_open+0x50/0x350 drivers/bluetooth/hci_vhci.c:316 [< none >] misc_open+0x388/0x520 drivers/char/misc.c:153 [< none >] chrdev_open+0x22a/0x4c0 fs/char_dev.c:388 [< none >] do_dentry_open+0x6a2/0xcb0 fs/open.c:736 [< none >] vfs_open+0x17b/0x1f0 fs/open.c:853 [< inline >] do_last fs/namei.c:3254 [< none >] path_openat+0xde9/0x5e30 fs/namei.c:3386 [< none >] do_filp_open+0x18e/0x250 fs/namei.c:3421 [< none >] do_sys_open+0x1fc/0x420 fs/open.c:1022 [< inline >] SYSC_open fs/open.c:1040 [< none >] SyS_open+0x2d/0x40 fs/open.c:1035 [< none >] entry_SYSCALL_64_fastpath+0x16/0x7a Then memory was freed here (by the same task): INFO: Freed in vhci_release+0xae/0xe0 age=11634 cpu=2 pid=10397 [< none >] __slab_free+0x1fc/0x320 mm/slub.c:2680 [< inline >] slab_free mm/slub.c:2835 [< none >] kfree+0x2ac/0x2c0 mm/slub.c:3664 [< none >] vhci_release+0xae/0xe0 drivers/bluetooth/hci_vhci.c:346 [< none >] __fput+0x236/0x780 fs/file_table.c:208 [< none >] ____fput+0x15/0x20 fs/file_table.c:244 [< none >] task_work_run+0x170/0x210 kernel/task_work.c:115 [< inline >] exit_task_work include/linux/task_work.h:21 [< none >] do_exit+0x8b5/0x2cb0 kernel/exit.c:748 [< none >] do_group_exit+0x108/0x330 kernel/exit.c:878 [< none >] get_signal+0x5e4/0x14f0 kernel/signal.c:2307 [< none >] do_signal+0x83/0x1c90 arch/x86/kernel/signal.c:712 [< none >] exit_to_usermode_loop+0x1a5/0x210 arch/x86/entry/common.c:247 [< inline >] prepare_exit_to_usermode arch/x86/entry/common.c:282 [< none >] syscall_return_slowpath+0x2ba/0x340 arch/x86/entry/common.c:344 [< none >] int_ret_from_sys_call+0x25/0x9f arch/x86/entry/entry_64.S:281 And then a worker thread accessed it here: Call Trace: [< inline >] kasan_report mm/kasan/report.c:274 [<ffffffff81764f9e>] __asan_report_store8_noabort+0x3e/0x40 mm/kasan/report.c:300 [< inline >] debug_spin_unlock kernel/locking/spinlock_debug.c:102 [<ffffffff81466608>] do_raw_spin_unlock+0x228/0x240 kernel/locking/spinlock_debug.c:158 [< inline >] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [<ffffffff86652cf7>] _raw_spin_unlock_irqrestore+0x27/0xc0 kernel/locking/spinlock.c:191 [< inline >] spin_unlock_irqrestore include/linux/spinlock.h:362 [<ffffffff8143975f>] __wake_up+0x3f/0x50 kernel/sched/wait.c:96 [<ffffffff8484b983>] vhci_send_frame+0xc3/0x100 drivers/bluetooth/hci_vhci.c:86 [<ffffffff85d38315>] hci_send_frame+0x1f5/0x310 net/bluetooth/hci_core.c:3316 [<ffffffff85d385bf>] hci_cmd_work+0x18f/0x2e0 net/bluetooth/hci_core.c:4196 [<ffffffff813a2386>] process_one_work+0x796/0x1440 kernel/workqueue.c:2037 [<ffffffff813a310b>] worker_thread+0xdb/0xfc0 kernel/workqueue.c:2171 [<ffffffff813b637f>] kthread+0x23f/0x2d0 drivers/block/aoe/aoecmd.c:1303 [<ffffffff866535ef>] ret_from_fork+0x3f/0x70 arch/x86/entry/entry_64.S:468 So either freeing of the memory must be delayed, or the access must not happen.
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