general protection fault in __lock

general protection fault in __lock_acquire
Status: public: reported C repro on 2019/04/14 00:00
Reported-by: syzbot+3fdad6e3bdc26c4bcf3a@syzkaller.appspotmail.com
First crash: 1348d, last: 1315d

similar bugs (3):
Kernel	Title	Repro	Count	Last	Reported	Patched	Status
upstream	general protection fault in __lock_acquire		5	1384d	1436d	3/22	fixed on 2017/10/24 06:54
android-44	general protection fault in __lock_acquire	C	5	1277d	838d	0/2	public: reported C repro on 2019/04/13 00:00
upstream	general protection fault in __lock_acquire (2)	C	15	1279d	1365d	4/22	fixed on 2018/01/27 14:55

Sample crash report:

==================================================================
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 3844 Comm: syzkaller977133 Not tainted 4.9.71-g2506378 #113
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c5ee9800 task.stack: ffff8801c5ef8000
RIP: 0010:[<ffffffff8123a1b4>]  [<ffffffff8123a1b4>] __lock_acquire+0x194/0x3640 kernel/locking/lockdep.c:3234
RSP: 0018:ffff8801c5eff8e0  EFLAGS: 00010086
RAX: dead4ead00000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 1ffff10038f88950 RSI: 0000000000000000 RDI: ffff8801c7c44a80
RBP: ffff8801c5effaa0 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: ffff8801c5ee9800 R12: 0000000000000001
R13: 0000000000000001 R14: 0000000000000000 R15: ffff8801c7c44a78
FS:  00007fb399772700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb399771e78 CR3: 00000001c8971000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff814ccab0 ffff8801c939caa8 ffff8801c5ee9800 ffffed0038bdd415
 dffffc0000000000 ffff8801c8a3e5c0 0000000000000000 ffff8801c5eea0b0
 ffff8801c5eea088 ffff8801c5eff9e0 0000000000000246 ffff8801c5ee9800
Call Trace:
 [<ffffffff8123e09e>] lock_acquire+0x12e/0x410 kernel/locking/lockdep.c:3756
 [<ffffffff838aeede>] __raw_write_lock_irqsave include/linux/rwlock_api_smp.h:186 [inline]
 [<ffffffff838aeede>] _raw_write_lock_irqsave+0x4e/0x62 kernel/locking/spinlock.c:303
 [<ffffffff82664ba0>] sg_remove_request+0x70/0x120 drivers/scsi/sg.c:2122
 [<ffffffff826651b5>] sg_finish_rem_req+0x295/0x340 drivers/scsi/sg.c:1838
 [<ffffffff82666fec>] sg_read+0xa1c/0x1440 drivers/scsi/sg.c:527
 [<ffffffff81569903>] __vfs_read+0x103/0x670 fs/read_write.c:452
 [<ffffffff8156d69e>] vfs_read+0x11e/0x380 fs/read_write.c:475
 [<ffffffff815713c9>] SYSC_read fs/read_write.c:591 [inline]
 [<ffffffff815713c9>] SyS_read+0xd9/0x1b0 fs/read_write.c:584
 [<ffffffff838aef85>] entry_SYSCALL_64_fastpath+0x23/0xc6
Code: 9e ff ff 44 8b 94 24 98 00 00 00 48 85 c0 8b 8c 24 90 00 00 00 44 8b 8c 24 88 00 00 00 4c 8b 9c 24 80 00 00 00 0f 84 ff 07 00 00 <f0> ff 80 98 01 00 00 49 8d b3 a8 08 00 00 48 ba 00 00 00 00 00 
RIP  [<ffffffff8123a1b4>] __lock_acquire+0x194/0x3640 kernel/locking/lockdep.c:3234
 RSP <ffff8801c5eff8e0>
---[ end trace 83f0cb5afceb023a ]---
Kernel panic - not syncing: Fatal exception
BUG: KASAN: slab-out-of-bounds in __read_once_size include/linux/compiler.h:243 [inline]
BUG: KASAN: slab-out-of-bounds in list_empty include/linux/list.h:189 [inline]
BUG: KASAN: slab-out-of-bounds in sg_remove_request+0x103/0x120 drivers/scsi/sg.c:2120
Read of size 8 at addr ffff8801c7c44bc0 by task syzkaller977133/3843

CPU: 1 PID: 3843 Comm: syzkaller977133 Tainted: G      D         4.9.71-g2506378 #113
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801c5ef7ab0 ffffffff81d922b9 ffffea00071f1100 ffff8801c7c44bc0
 0000000000000000 ffff8801c7c44bc0 ffff8801c5de2338 ffff8801c5ef7ae8
 ffffffff8153bab3 ffff8801c7c44bc0 0000000000000008 0000000000000000
Call Trace:
 [<ffffffff81d922b9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d922b9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff8153bab3>] print_address_description+0x73/0x280 mm/kasan/report.c:252
 [<ffffffff8153bfd5>] kasan_report_error mm/kasan/report.c:351 [inline]
 [<ffffffff8153bfd5>] kasan_report+0x275/0x360 mm/kasan/report.c:408
 [<ffffffff8153c134>] __asan_report_load8_noabort+0x14/0x20 mm/kasan/report.c:429
 [<ffffffff82664c33>] __read_once_size include/linux/compiler.h:243 [inline]
 [<ffffffff82664c33>] list_empty include/linux/list.h:189 [inline]
 [<ffffffff82664c33>] sg_remove_request+0x103/0x120 drivers/scsi/sg.c:2120
 [<ffffffff826651b5>] sg_finish_rem_req+0x295/0x340 drivers/scsi/sg.c:1838
 [<ffffffff82666fec>] sg_read+0xa1c/0x1440 drivers/scsi/sg.c:527
 [<ffffffff81569903>] __vfs_read+0x103/0x670 fs/read_write.c:452
 [<ffffffff8156d69e>] vfs_read+0x11e/0x380 fs/read_write.c:475
 [<ffffffff815713c9>] SYSC_read fs/read_write.c:591 [inline]
 [<ffffffff815713c9>] SyS_read+0xd9/0x1b0 fs/read_write.c:584
 [<ffffffff838aef85>] entry_SYSCALL_64_fastpath+0x23/0xc6

Allocated by task 0:
(stack is not available)

Freed by task 0:
(stack is not available)

The buggy address belongs to the object at ffff8801c7c44b80
 which belongs to the cache fasync_cache of size 96
The buggy address is located 64 bytes inside of
 96-byte region [ffff8801c7c44b80, ffff8801c7c44be0)
The buggy address belongs to the page:
page:ffffea00071f1100 count:1 mapcount:0 mapping:          (null) index:0x0
flags: 0x8000000000000080(slab)
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8801c7c44a80: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc
 ffff8801c7c44b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8801c7c44b80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
                                           ^
 ffff8801c7c44c00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8801c7c44c80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..

Crashes (3):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro
ci-android-49-kasan-gce	2017/12/22 08:43	https://android.googlesource.com/kernel/common android-4.9	250637879165	81fe66b4	.config	log	report	syz	C
ci-android-49-kasan-gce	2017/11/18 17:50	https://android.googlesource.com/kernel/common android-4.9	44a3afcce10a	eff27f33	.config	log	report	syz
ci-android-49-kasan-gce	2017/11/18 17:07	https://android.googlesource.com/kernel/common android-4.9	44a3afcce10a	eff27f33	.config	log	report