KASAN: use-after-free Read in lockref

duplicates (2):
Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
general protection fault in simple_recursive_removal fs	2				2	2062d	2117d	0/29	closed as dup on 2020/06/28 17:09
KASAN: use-after-free Read in debugfs_remove (3)	19	C	done	error	88	2108d	2574d	0/29	closed as dup on 2020/06/28 17:08

duplicates (2):

Title

Rank 🛈

general protection fault in simple_recursive_removal fs

2062d

2117d

0/29

closed as dup on 2020/06/28 17:09

KASAN: use-after-free Read in debugfs_remove (3)

done

error

2108d

2574d

0/29

closed as dup on 2020/06/28 17:08

Title	Replies (including bot)	Last reply
[PATCH 4.19 00/71] 4.19.156-rc1 review	87 (87)	2020/11/19 08:10
[PATCH 4.14 00/48] 4.14.205-rc1 review	53 (53)	2020/11/10 10:04
[PATCH 5.8 000/464] 5.8.2-rc1 review	475 (475)	2020/08/19 06:11
[PATCH 5.4 000/270] 5.4.59-rc1 review	275 (275)	2020/08/18 22:37
[PATCH 5.7 000/393] 5.7.16-rc1 review	398 (398)	2020/08/18 22:36
[PATCH AUTOSEL 5.8 01/72] ARM: dts: stm32: fix uart nodes ordering in stm32mp15-pinctrl	74 (74)	2020/08/16 13:50
[PATCH AUTOSEL 5.4 01/40] x86/mce/inject: Fix a wrong assignment of i_mce.status	40 (40)	2020/08/08 23:38
[PATCH AUTOSEL 5.7 01/58] ARM: dts: stm32: fix uart7_pins_a comments in stm32mp15-pinctrl	58 (58)	2020/08/08 23:37
[PATCH v7 0/8] blktrace: fix debugfs use after free	24 (24)	2020/06/23 16:56
[PATCH v6 0/8] block: fix blktrace debugfs use after free	22 (22)	2020/06/19 20:23
[PATCH v5 0/7] block: fix blktrace debugfs use after free	24 (24)	2020/06/05 22:33
[PATCH v4 0/5] block: fix blktrace debugfs use after free	16 (16)	2020/05/16 01:39
[PATCH v3 0/6] block: fix blktrace debugfs use after free	34 (34)	2020/05/07 11:30
Re: [PATCH v3 4/6] blktrace: fix debugfs use after free	1 (1)	2020/04/29 08:48
[PATCH v2 00/10] block: fix blktrace debugfs use after free	58 (58)	2020/04/25 11:43
[PATCH 0/5] blktrace: fix use after free	53 (53)	2020/04/17 04:09
[RFC v2 0/5] blktrace: fix use after free	20 (20)	2020/04/14 03:38
Re: [RFC v2 2/5] blktrace: fix debugfs use after free	1 (1)	2020/04/10 19:37
[RFC 0/3] block: address blktrace use-after-free	29 (29)	2020/04/09 20:59
KASAN: use-after-free Read in lockref_get	0 (1)	2020/02/26 07:00

================================================================== BUG: KASAN: use-after-free in __lock_acquire+0x3b1e/0x48a0 kernel/locking/lockdep.c:4250 Read of size 8 at addr ffff888086217940 by task syz-executor.5/15483 CPU: 1 PID: 15483 Comm: syz-executor.5 Not tainted 5.7.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x188/0x20d lib/dump_stack.c:118 print_address_description.constprop.0.cold+0xd3/0x413 mm/kasan/report.c:383 __kasan_report mm/kasan/report.c:513 [inline] kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530 __lock_acquire+0x3b1e/0x48a0 kernel/locking/lockdep.c:4250 lock_acquire+0x1f2/0x8f0 kernel/locking/lockdep.c:4959 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 lockref_get+0x11/0x50 include/linux/spinlock.h:353 dget include/linux/dcache.h:323 [inline] simple_recursive_removal+0x43/0x730 fs/libfs.c:268 debugfs_remove fs/debugfs/inode.c:703 [inline] debugfs_remove+0x59/0x80 fs/debugfs/inode.c:697 blk_trace_free+0x31/0x130 kernel/trace/blktrace.c:311 do_blk_trace_setup+0x711/0xb30 kernel/trace/blktrace.c:557 __blk_trace_setup+0xca/0x180 kernel/trace/blktrace.c:571 blk_trace_ioctl+0x162/0x2b0 kernel/trace/blktrace.c:712 blkdev_ioctl+0xc1/0x6c0 block/ioctl.c:613 block_ioctl+0xf9/0x140 fs/block_dev.c:1987 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:771 __do_sys_ioctl fs/ioctl.c:780 [inline] __se_sys_ioctl fs/ioctl.c:778 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:778 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x45ca69 Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f553d9a0c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00000000004e1900 RCX: 000000000045ca69 RDX: 0000000020000080 RSI: 00000000c0481273 RDI: 0000000000000008 RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 000000000000022a R14: 00000000004c4746 R15: 00007f553d9a16d4 Allocated by task 15483: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] __kasan_kmalloc mm/kasan/common.c:494 [inline] __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:467 slab_post_alloc_hook mm/slab.h:586 [inline] slab_alloc mm/slab.c:3320 [inline] kmem_cache_alloc+0x11b/0x740 mm/slab.c:3484 __d_alloc+0x2a/0x920 fs/dcache.c:1709 d_alloc+0x4a/0x240 fs/dcache.c:1788 d_alloc_parallel+0xe8/0x1b10 fs/dcache.c:2540 __lookup_slow+0x193/0x490 fs/namei.c:1515 lookup_one_len+0x163/0x190 fs/namei.c:2548 start_creating+0x12b/0x250 fs/debugfs/inode.c:338 __debugfs_create_file+0x62/0x400 fs/debugfs/inode.c:383 do_blk_trace_setup+0x351/0xb30 kernel/trace/blktrace.c:524 __blk_trace_setup+0xca/0x180 kernel/trace/blktrace.c:571 blk_trace_ioctl+0x162/0x2b0 kernel/trace/blktrace.c:712 blkdev_ioctl+0xc1/0x6c0 block/ioctl.c:613 block_ioctl+0xf9/0x140 fs/block_dev.c:1987 vfs_ioctl fs/ioctl.c:47 [inline] ksys_ioctl+0x11a/0x180 fs/ioctl.c:771 __do_sys_ioctl fs/ioctl.c:780 [inline] __se_sys_ioctl fs/ioctl.c:778 [inline] __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:778 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 Freed by task 6811: save_stack+0x1b/0x40 mm/kasan/common.c:48 set_track mm/kasan/common.c:56 [inline] kasan_set_free_info mm/kasan/common.c:316 [inline] __kasan_slab_free+0xf7/0x140 mm/kasan/common.c:455 __cache_free mm/slab.c:3426 [inline] kmem_cache_free+0x7f/0x320 mm/slab.c:3694 rcu_do_batch kernel/rcu/tree.c:2396 [inline] rcu_core+0x59f/0x1370 kernel/rcu/tree.c:2623 __do_softirq+0x26c/0x9f7 kernel/softirq.c:292 The buggy address belongs to the object at ffff8880862178a0 which belongs to the cache dentry of size 304 The buggy address is located 160 bytes inside of 304-byte region [ffff8880862178a0, ffff8880862179d0) The buggy address belongs to the page: page:ffffea00021885c0 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 flags: 0xfffe0000000200(slab) raw: 00fffe0000000200 ffffea0002185648 ffffea0002188648 ffff88821bc50540 raw: 0000000000000000 ffff888086217000 000000010000000b 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff888086217800: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc ffff888086217880: fc fc fc fc fb fb fb fb fb fb fb fb fb fb fb fb >ffff888086217900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff888086217980: fb fb fb fb fb fb fb fb fb fb fc fc fc fc fc fc ffff888086217a00: fc fc 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ==================================================================

Crashes (7):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Manager
2020/06/04 20:45	upstream	acf25aa66371	6720fdef	.config	console log	report	ci-upstream-kasan-gce-root
2020/04/26 18:46	upstream	b2768df24ec4	0ce7569e	.config	console log	report	ci-upstream-kasan-gce
2020/03/25 13:42	upstream	76ccd234269b	41f049cc	.config	console log	report	ci-upstream-kasan-gce
2020/03/22 17:16	upstream	b74b991fb8b9	78267cec	.config	console log	report	ci-upstream-kasan-gce-smack-root
2020/03/21 20:39	upstream	5ad0ec0b8652	4288d95e	.config	console log	report	ci-upstream-kasan-gce-smack-root
2020/02/26 03:02	upstream	f8788d86ab28	59b57593	.config	console log	report	ci-upstream-kasan-gce
2020/05/02 15:09	linux-next	ac935d227366	58da4c35	.config	console log	report	ci-upstream-linux-next-kasan-gce-root

Crashes (7):

Assets (help?)