possible deadlock in do_io

Title	Replies (including bot)	Last reply
possible deadlock in do_io_accounting (3)	0 (4)	2020/04/25 14:32

Title

Replies (including bot)

Last reply

possible deadlock in do_io_accounting (3)

0 (4)

2020/04/25 14:32

Kernel	Title	Rank 🛈	Repro	Fix bisect	Count	Last	Reported	Patched	Status
android-49	possible deadlock in do_io_accounting	4	syz, C		4521	2457d	2693d	0/3	public: reported C repro on 2019/04/12 00:00
android-44	possible deadlock in do_io_accounting	4	syz, C		28	2459d	2694d	0/2	public: reported C repro on 2019/04/11 08:44
linux-4.19	possible deadlock in do_io_accounting	4	syz, C	done	4	2522d	2633d	1/1	fixed on 2019/12/10 20:49
linux-4.19	possible deadlock in do_io_accounting (2)	4	syz	error	26	2174d	2437d	0/1	upstream: reported syz repro on 2019/12/24 07:12
upstream	possible deadlock in do_io_accounting fs	4	syz		1003	2708d	3186d	0/29	closed as dup on 2017/12/12 21:27
upstream	possible deadlock in do_io_accounting (2) fs	4			1	2682d	2679d	0/29	auto-closed as invalid on 2019/10/20 09:03
android-414	possible deadlock in do_io_accounting	4	syz		70	2710d	2693d	0/1	public: reported syz repro on 2019/04/12 00:01
linux-4.14	possible deadlock in do_io_accounting	4	syz, C	error	56	1671d	2620d	0/1	upstream: reported C repro on 2019/06/24 03:04

overlayfs: failed to resolve './file0': -2 ====================================================== WARNING: possible circular locking dependency detected 5.5.0-rc3-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor763/9723 is trying to acquire lock: ffff8880a95dfed0 (&sig->cred_guard_mutex){+.+.}, at: do_io_accounting+0x1f4/0x820 fs/proc/base.c:2773 but task is already holding lock: ffff8880a24999a0 (&p->lock){+.+.}, at: seq_read+0x71/0x1170 fs/seq_file.c:161 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&p->lock){+.+.}: __mutex_lock_common kernel/locking/mutex.c:956 [inline] __mutex_lock+0x156/0x13c0 kernel/locking/mutex.c:1103 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1118 seq_read+0x71/0x1170 fs/seq_file.c:161 do_loop_readv_writev fs/read_write.c:714 [inline] do_loop_readv_writev fs/read_write.c:701 [inline] do_iter_read+0x4a4/0x660 fs/read_write.c:935 vfs_readv+0xf0/0x160 fs/read_write.c:997 kernel_readv fs/splice.c:365 [inline] default_file_splice_read+0x4fb/0xa20 fs/splice.c:422 do_splice_to+0x127/0x180 fs/splice.c:892 splice_direct_to_actor+0x320/0xa30 fs/splice.c:971 do_splice_direct+0x1da/0x2a0 fs/splice.c:1080 do_sendfile+0x597/0xd00 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1525 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0x1dd/0x220 fs/read_write.c:1511 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #2 (sb_writers#3){.+.+}: percpu_down_read include/linux/percpu-rwsem.h:40 [inline] __sb_start_write+0x241/0x460 fs/super.c:1674 sb_start_write include/linux/fs.h:1650 [inline] mnt_want_write+0x3f/0xc0 fs/namespace.c:354 ovl_want_write+0x76/0xa0 fs/overlayfs/util.c:21 ovl_create_object+0xb3/0x2c0 fs/overlayfs/dir.c:596 ovl_create+0x28/0x30 fs/overlayfs/dir.c:627 lookup_open+0x12d5/0x1a90 fs/namei.c:3241 do_last fs/namei.c:3331 [inline] path_openat+0x14a2/0x4500 fs/namei.c:3537 do_filp_open+0x1a1/0x280 fs/namei.c:3567 do_sys_open+0x3fe/0x5d0 fs/open.c:1097 __do_sys_open fs/open.c:1115 [inline] __se_sys_open fs/open.c:1110 [inline] __x64_sys_open+0x7e/0xc0 fs/open.c:1110 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #1 (&ovl_i_mutex_dir_key[depth]){++++}: down_read+0x95/0x430 kernel/locking/rwsem.c:1495 inode_lock_shared include/linux/fs.h:801 [inline] do_last fs/namei.c:3330 [inline] path_openat+0x1e37/0x4500 fs/namei.c:3537 do_filp_open+0x1a1/0x280 fs/namei.c:3567 do_open_execat+0x137/0x690 fs/exec.c:856 __do_execve_file.isra.0+0x1702/0x22b0 fs/exec.c:1761 do_execveat_common fs/exec.c:1867 [inline] do_execve fs/exec.c:1884 [inline] __do_sys_execve fs/exec.c:1960 [inline] __se_sys_execve fs/exec.c:1955 [inline] __x64_sys_execve+0x8f/0xc0 fs/exec.c:1955 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&sig->cred_guard_mutex){+.+.}: check_prev_add kernel/locking/lockdep.c:2476 [inline] check_prevs_add kernel/locking/lockdep.c:2581 [inline] validate_chain kernel/locking/lockdep.c:2971 [inline] __lock_acquire+0x2596/0x4a00 kernel/locking/lockdep.c:3955 lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4485 __mutex_lock_common kernel/locking/mutex.c:956 [inline] __mutex_lock+0x156/0x13c0 kernel/locking/mutex.c:1103 mutex_lock_killable_nested+0x16/0x20 kernel/locking/mutex.c:1133 do_io_accounting+0x1f4/0x820 fs/proc/base.c:2773 proc_tgid_io_accounting+0x23/0x30 fs/proc/base.c:2822 proc_single_show+0xfd/0x1c0 fs/proc/base.c:756 seq_read+0x4ca/0x1170 fs/seq_file.c:229 do_loop_readv_writev fs/read_write.c:714 [inline] do_loop_readv_writev fs/read_write.c:701 [inline] do_iter_read+0x4a4/0x660 fs/read_write.c:935 vfs_readv+0xf0/0x160 fs/read_write.c:997 kernel_readv fs/splice.c:365 [inline] default_file_splice_read+0x4fb/0xa20 fs/splice.c:422 do_splice_to+0x127/0x180 fs/splice.c:892 splice_direct_to_actor+0x320/0xa30 fs/splice.c:971 do_splice_direct+0x1da/0x2a0 fs/splice.c:1080 do_sendfile+0x597/0xd00 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1525 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0x1dd/0x220 fs/read_write.c:1511 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Chain exists of: &sig->cred_guard_mutex --> sb_writers#3 --> &p->lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&p->lock); lock(sb_writers#3); lock(&p->lock); lock(&sig->cred_guard_mutex); *** DEADLOCK *** 2 locks held by syz-executor763/9723: #0: ffff888098910428 (sb_writers#9){.+.+}, at: file_start_write include/linux/fs.h:2885 [inline] #0: ffff888098910428 (sb_writers#9){.+.+}, at: do_sendfile+0x9b9/0xd00 fs/read_write.c:1463 #1: ffff8880a24999a0 (&p->lock){+.+.}, at: seq_read+0x71/0x1170 fs/seq_file.c:161 stack backtrace: CPU: 0 PID: 9723 Comm: syz-executor763 Not tainted 5.5.0-rc3-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+0x197/0x210 lib/dump_stack.c:118 print_circular_bug.isra.0.cold+0x163/0x172 kernel/locking/lockdep.c:1685 check_noncircular+0x32e/0x3e0 kernel/locking/lockdep.c:1809 check_prev_add kernel/locking/lockdep.c:2476 [inline] check_prevs_add kernel/locking/lockdep.c:2581 [inline] validate_chain kernel/locking/lockdep.c:2971 [inline] __lock_acquire+0x2596/0x4a00 kernel/locking/lockdep.c:3955 lock_acquire+0x190/0x410 kernel/locking/lockdep.c:4485 __mutex_lock_common kernel/locking/mutex.c:956 [inline] __mutex_lock+0x156/0x13c0 kernel/locking/mutex.c:1103 mutex_lock_killable_nested+0x16/0x20 kernel/locking/mutex.c:1133 do_io_accounting+0x1f4/0x820 fs/proc/base.c:2773 proc_tgid_io_accounting+0x23/0x30 fs/proc/base.c:2822 proc_single_show+0xfd/0x1c0 fs/proc/base.c:756 seq_read+0x4ca/0x1170 fs/seq_file.c:229 do_loop_readv_writev fs/read_write.c:714 [inline] do_loop_readv_writev fs/read_write.c:701 [inline] do_iter_read+0x4a4/0x660 fs/read_write.c:935 vfs_readv+0xf0/0x160 fs/read_write.c:997 kernel_readv fs/splice.c:365 [inline] default_file_splice_read+0x4fb/0xa20 fs/splice.c:422 do_splice_to+0x127/0x180 fs/splice.c:892 splice_direct_to_actor+0x320/0xa30 fs/splice.c:971 do_splice_direct+0x1da/0x2a0 fs/splice.c:1080 do_sendfile+0x597/0xd00 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1525 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0x1dd/0x220 fs/read_write.c:1511 do_syscall_64+0xfa/0x790 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4496d9 Code: e8 9c e6 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 3b 05 fc ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f91dddd5db8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 00000000006e5a18 RCX: 00000000004496d9 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000005 RBP: 00000000006e5a10 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000209 R11: 0000000000000246 R12: 00000000006e5a1c R13: 00007ffc82ca42cf R14: 00007f91dddd69c0 R15: 20c49ba5e353f7cf

Crashes (39):
Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Manager
2019/12/27 11:54	upstream	46cf053efec6	be5c2c81	.config	console log	report	syz	C	ci-upstream-kasan-gce-root
2019/12/27 03:03	upstream	46cf053efec6	be5c2c81	.config	console log	report	syz		ci-upstream-kasan-gce-selinux-root
2020/03/26 04:11	upstream	1b649e0bcae7	e8e6c7d2	.config	console log	report			ci-upstream-kasan-gce-root
2020/03/21 07:09	upstream	5ad0ec0b8652	2c31c529	.config	console log	report			ci-upstream-kasan-gce-root
2020/03/18 21:07	upstream	5076190daded	0a96a13c	.config	console log	report			ci-upstream-kasan-gce-root
2020/03/17 06:50	upstream	fb33c6510d55	749688d2	.config	console log	report			ci-upstream-kasan-gce-root
2020/03/16 14:47	upstream	fb33c6510d55	749688d2	.config	console log	report			ci-upstream-kasan-gce-root
2020/03/04 12:42	upstream	63623fd44972	c88c7b75	.config	console log	report			ci-upstream-kasan-gce-selinux-root
2020/02/26 17:23	upstream	f8788d86ab28	59b57593	.config	console log	report			ci-upstream-kasan-gce-root
2020/02/16 23:21	upstream	11a48a5a18c6	1f448cd6	.config	console log	report			ci-upstream-kasan-gce-root
2020/02/14 08:04	upstream	b19e8c684703	5d7b90f1	.config	console log	report			ci-upstream-kasan-gce-root
2020/02/13 16:23	upstream	0bf999f9c5e7	c5ed587f	.config	console log	report			ci-upstream-kasan-gce-root
2020/02/10 15:14	upstream	bb6d3fb354c5	18847f55	.config	console log	report			ci-upstream-kasan-gce-root
2020/02/09 01:51	upstream	d4f309ca4118	06150bf1	.config	console log	report			ci-upstream-kasan-gce-root
2020/02/07 22:55	upstream	41dcd67e8868	06150bf1	.config	console log	report			ci-upstream-kasan-gce-root
2020/02/07 03:40	upstream	90568ecf5615	06150bf1	.config	console log	report			ci-upstream-kasan-gce-selinux-root
2020/02/06 15:33	upstream	4c46bef2e96a	c91cbc9d	.config	console log	report			ci-upstream-kasan-gce-root
2020/02/04 02:51	upstream	754beeec1d90	93e5e335	.config	console log	report			ci-upstream-kasan-gce-selinux-root
2020/01/28 21:36	upstream	c677124e631d	c8e81ce4	.config	console log	report			ci-upstream-kasan-gce-root
2020/01/26 21:31	upstream	a45ea48e2bcd	dd56146d	.config	console log	report			ci-upstream-kasan-gce-root
2020/01/26 01:14	upstream	2821e26f3a0a	f4e7270e	.config	console log	report			ci-upstream-kasan-gce-root
2020/01/22 17:26	upstream	d96d875ef5dd	8eda0b95	.config	console log	report			ci-upstream-kasan-gce-root
2020/01/20 08:38	upstream	def9d2780727	0342f8c7	.config	console log	report			ci-upstream-kasan-gce-selinux-root
2020/01/15 09:50	upstream	95e20af9fb9c	fa12bd3c	.config	console log	report			ci-upstream-kasan-gce-selinux-root
2020/01/15 09:25	upstream	95e20af9fb9c	fa12bd3c	.config	console log	report			ci-upstream-kasan-gce-selinux-root
2020/01/14 20:25	upstream	e033e7d4a808	fa12bd3c	.config	console log	report			ci-upstream-kasan-gce-selinux-root
2020/01/14 01:35	upstream	b3a987b0264d	32881205	.config	console log	report			ci-upstream-kasan-gce-selinux-root
2020/01/14 01:02	upstream	b3a987b0264d	32881205	.config	console log	report			ci-upstream-kasan-gce-selinux-root
2020/01/13 12:44	upstream	b3a987b0264d	99565c1a	.config	console log	report			ci-upstream-kasan-gce-root
2020/01/12 11:51	upstream	6327edceb62b	31290a45	.config	console log	report			ci-upstream-kasan-gce-root
2020/01/09 05:24	upstream	b07f636fca1c	ddc3e859	.config	console log	report			ci-upstream-kasan-gce-root
2019/12/26 11:24	upstream	46cf053efec6	be5c2c81	.config	console log	report			ci-upstream-kasan-gce-selinux-root
2019/12/25 04:28	upstream	46cf053efec6	be5c2c81	.config	console log	report			ci-upstream-kasan-gce-root
2020/03/21 11:07	linux-next	770fbb32d34e	4288d95e	.config	console log	report			ci-upstream-linux-next-kasan-gce-root
2020/03/05 01:32	linux-next	c99b17ac0399	c88c7b75	.config	console log	report			ci-upstream-linux-next-kasan-gce-root
2020/02/17 07:59	linux-next	c25a951c50dc	1f448cd6	.config	console log	report			ci-upstream-linux-next-kasan-gce-root
2020/02/10 00:56	linux-next	6dff1565d69c	35f5e45e	.config	console log	report			ci-upstream-linux-next-kasan-gce-root
2020/01/12 11:53	linux-next	6c09d7dbb7d3	31290a45	.config	console log	report			ci-upstream-linux-next-kasan-gce-root
2020/01/12 11:28	linux-next	6c09d7dbb7d3	31290a45	.config	console log	report			ci-upstream-linux-next-kasan-gce-root

Crashes (39):

Assets (help?)

2019/12/27 11:54

upstream