android-4.4 boot error: KASAN: use-after-free Read in prepare_to_wait_event

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: a749771a Merge 4.4.194 into android-4.4
git tree: android-4.4
console output: https://syzkaller.appspot.com/x/log.txt?x=14a9d61f600000
kernel config: https://syzkaller.appspot.com/x/.config?x=c60f19ec0c23d4f0
dashboard link: https://syzkaller.appspot.com/bug?extid=9ef89a3e65eb66db2c12
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+9ef89a...@syzkaller.appspotmail.com

hidraw: raw HID events driver (C) Jiri Kosina
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
ion_heap_create: Heap type is disabled: 1
kasan: CONFIG_KASAN_INLINE enabled[ 4.034867]
==================================================================
BUG: KASAN: use-after-free in debug_spin_lock_before
kernel/locking/spinlock_debug.c:83 [inline]
BUG: KASAN: use-after-free in do_raw_spin_lock+0x2e6/0x370
kernel/locking/spinlock_debug.c:135
Read of size 4 at addr ffff8801d7cc60ec by task system/344

CPU: 1 PID: 344 Comm: system Not tainted 4.4.194+ #0
0000000000000000 90eb113e309bf341 ffff8801d7f17b00 ffffffff81ac3b21
0000000000000000 ffffea00075f3180 ffff8801d7cc60ec 0000000000000004
ffff8801d7f17c80 ffff8801d7f17b38 ffffffff81494730 0000000000000000
Call Trace:
[<ffffffff81ac3b21>] __dump_stack lib/dump_stack.c:15 [inline]
[<ffffffff81ac3b21>] dump_stack+0xc1/0x120 lib/dump_stack.c:51
[<ffffffff81494730>] print_address_description+0x6f/0x21b
mm/kasan/report.c:252
[<ffffffff81494968>] kasan_report_error mm/kasan/report.c:351 [inline]
[<ffffffff81494968>] kasan_report mm/kasan/report.c:408 [inline]
[<ffffffff81494968>] kasan_report.cold+0x8c/0x2be mm/kasan/report.c:393
[<ffffffff814894c4>] __asan_report_load4_noabort+0x14/0x20
mm/kasan/report.c:428
[<ffffffff81212376>] debug_spin_lock_before
kernel/locking/spinlock_debug.c:83 [inline]
[<ffffffff81212376>] do_raw_spin_lock+0x2e6/0x370
kernel/locking/spinlock_debug.c:135
[<ffffffff82735cb8>] __raw_spin_lock_irqsave
include/linux/spinlock_api_smp.h:119 [inline]
[<ffffffff82735cb8>] _raw_spin_lock_irqsave+0x58/0x70
kernel/locking/spinlock.c:159
[<ffffffff811edc28>] prepare_to_wait_event+0x108/0x660
kernel/sched/wait.c:209
[<ffffffff8212a49b>] ion_heap_deferred_free+0x33b/0x500
drivers/staging/android/ion/ion_heap.c:232
[<ffffffff811376e3>] kthread+0x273/0x310 kernel/kthread.c:211
[<ffffffff82736e05>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:537

Allocated by task 1:
[<ffffffff8102f9b6>] save_stack_trace+0x26/0x50
arch/x86/kernel/stacktrace.c:63
[<ffffffff81488532>] save_stack mm/kasan/kasan.c:512 [inline]
[<ffffffff81488532>] set_track mm/kasan/kasan.c:524 [inline]
[<ffffffff81488532>] kasan_kmalloc.part.0+0x62/0xf0 mm/kasan/kasan.c:616
[<ffffffff814887a7>] kasan_kmalloc+0xb7/0xd0 mm/kasan/kasan.c:601
[<ffffffff814847b3>] kmem_cache_alloc_trace+0x123/0x2d0 mm/slub.c:2642
[<ffffffff8212dd4b>] kmalloc include/linux/slab.h:476 [inline]
[<ffffffff8212dd4b>] kzalloc include/linux/slab.h:620 [inline]
[<ffffffff8212dd4b>] ion_system_heap_create+0x4b/0x2c0
drivers/staging/android/ion/ion_system_heap.c:283
[<ffffffff8212a7b6>] ion_heap_create+0x156/0x1b0
drivers/staging/android/ion/ion_heap.c:328
[<ffffffff832522a1>] ion_dummy_init+0x1e5/0x36d
drivers/staging/android/ion/ion_dummy_driver.c:106
[<ffffffff810004ab>] do_one_initcall+0x13b/0x260 init/main.c:793
[<ffffffff831d9b6b>] do_initcall_level init/main.c:858 [inline]
[<ffffffff831d9b6b>] do_initcalls init/main.c:866 [inline]
[<ffffffff831d9b6b>] do_basic_setup init/main.c:884 [inline]
[<ffffffff831d9b6b>] kernel_init_freeable+0x2fa/0x3c3 init/main.c:1029
[<ffffffff82723554>] kernel_init+0x12/0x15e init/main.c:957
[<ffffffff82736e05>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:537

Freed by task 1:
[<ffffffff8102f9b6>] save_stack_trace+0x26/0x50
arch/x86/kernel/stacktrace.c:63
[<ffffffff81488e30>] save_stack mm/kasan/kasan.c:512 [inline]
[<ffffffff81488e30>] set_track mm/kasan/kasan.c:524 [inline]
[<ffffffff81488e30>] kasan_slab_free+0xb0/0x190 mm/kasan/kasan.c:589
[<ffffffff81486254>] slab_free_hook mm/slub.c:1383 [inline]
[<ffffffff81486254>] slab_free_freelist_hook mm/slub.c:1405 [inline]
[<ffffffff81486254>] slab_free mm/slub.c:2859 [inline]
[<ffffffff81486254>] kfree+0xf4/0x310 mm/slub.c:3749
[<ffffffff8212e05a>] ion_system_heap_destroy+0x9a/0xc0
drivers/staging/android/ion/ion_system_heap.c:323
[<ffffffff8212a87a>] ion_heap_destroy+0x6a/0xd0
drivers/staging/android/ion/ion_heap.c:369
[<ffffffff8325237d>] ion_dummy_init+0x2c1/0x36d
drivers/staging/android/ion/ion_dummy_driver.c:116
[<ffffffff810004ab>] do_one_initcall+0x13b/0x260 init/main.c:793
[<ffffffff831d9b6b>] do_initcall_level init/main.c:858 [inline]
[<ffffffff831d9b6b>] do_initcalls init/main.c:866 [inline]
[<ffffffff831d9b6b>] do_basic_setup init/main.c:884 [inline]
[<ffffffff831d9b6b>] kernel_init_freeable+0x2fa/0x3c3 init/main.c:1029
[<ffffffff82723554>] kernel_init+0x12/0x15e init/main.c:957
[<ffffffff82736e05>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:537

The buggy address belongs to the object at ffff8801d7cc6000
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 236 bytes inside of
512-byte region [ffff8801d7cc6000, ffff8801d7cc6200)
The buggy address belongs to the page:
kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral
protection fault: 0000 [#1] PREEMPT SMP KASAN
Modules linked in:
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.4.194+ #0
task: ffff8801da5f0000 task.stack: ffff8801da5f8000
RIP: 0010:[<ffffffff8212a842>] [<ffffffff8212a842>]
ion_heap_destroy+0x32/0xd0 drivers/staging/android/ion/ion_heap.c:363
RSP: 0000:ffff8801da5ffda8 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: 0000000000000010 RCX: 0000000000000000
RDX: 0000000000000003 RSI: ffffffff8212a82c RDI: 000000000000001a
RBP: ffff8801da5ffdb8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffffffffffffea
R13: ffff8801d94db6c8 R14: dffffc0000000000 R15: ffffffffffffffea
FS: 0000000000000000(0000) GS:ffff8801db600000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000002e0a000 CR4: 00000000001606b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
dffffc0000000000 ffffffffffffffea ffff8801da5ffdf0 ffffffff8325237d
ffffffff82e11080 ffff8801d815ec20 dffffc0000000000 ffffffff832520bc
ffff8801da5ffeb0 ffff8801da5ffed8 ffffffff810004ab 0000000082ab4360
Call Trace:
[<ffffffff8325237d>] ion_dummy_init+0x2c1/0x36d
drivers/staging/android/ion/ion_dummy_driver.c:116
[<ffffffff810004ab>] do_one_initcall+0x13b/0x260 init/main.c:793
[<ffffffff831d9b6b>] do_initcall_level init/main.c:858 [inline]
[<ffffffff831d9b6b>] do_initcalls init/main.c:866 [inline]
[<ffffffff831d9b6b>] do_basic_setup init/main.c:884 [inline]
[<ffffffff831d9b6b>] kernel_init_freeable+0x2fa/0x3c3 init/main.c:1029
[<ffffffff82723554>] kernel_init+0x12/0x15e init/main.c:957
[<ffffffff82736e05>] ret_from_fork+0x55/0x80 arch/x86/entry/entry_64.S:537
Code: 89 fc 48 83 ec 08 e8 2e 2e 1e ff 4d 85 e4 74 53 e8 24 2e 1e ff 49 8d
7c 24 30 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02
84 c0 74 08 3c 03 0f 8e 83 00 00 00 41 8b 54 24 30
RIP [<ffffffff8212a842>] ion_heap_destroy+0x32/0xd0
drivers/staging/android/ion/ion_heap.c:363
RSP <ffff8801da5ffda8>
---[ end trace c1e9be859befaf2f ]---


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.