INFO: task can't die in lock

INFO: task can't die in lock_mount
Status: closed as dup on 2021/01/18 10:01
Reported-by: syzbot+88a6c9cb23c5d25506d7@syzkaller.appspotmail.com
First crash: 354d, last: 13d

Duplicate of (1):
Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported
INFO: task hung in lock_mount	C	error	error	1231	2d04h	1314d

similar bugs (4):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
linux-4.19	INFO: task hung in lock_mount (4)				6	19d	133d	0/1	upstream: reported on 2021/07/24 02:18
upstream	INFO: task hung in lock_mount	C	error	error	1231	2d04h	1314d	0/22	upstream: reported C repro on 2018/04/30 17:46
upstream	INFO: task can't die in iget5_locked				7	283d	307d	22/22	fixed on 2021/04/09 19:46
linux-4.19	INFO: task hung in lock_mount (3)				1	298d	298d	0/1	auto-closed as invalid on 2021/06/09 16:09

Sample crash report:

INFO: task syz-executor573:7293 can't die for more than 143 seconds.
task:syz-executor573 state:D stack:27632 pid: 7293 ppid:  6547 flags:0x00004004
Call Trace:
 context_switch kernel/sched/core.c:4955 [inline]
 __schedule+0x940/0x26f0 kernel/sched/core.c:6236
 schedule+0xd3/0x270 kernel/sched/core.c:6315
 rwsem_down_write_slowpath+0x7b9/0x11d0 kernel/locking/rwsem.c:1107
 __down_write_common kernel/locking/rwsem.c:1262 [inline]
 __down_write_common kernel/locking/rwsem.c:1259 [inline]
 __down_write kernel/locking/rwsem.c:1271 [inline]
 down_write+0x137/0x150 kernel/locking/rwsem.c:1518
 inode_lock include/linux/fs.h:786 [inline]
 lock_mount+0x8a/0x2e0 fs/namespace.c:2242
 do_new_mount_fc fs/namespace.c:2931 [inline]
 do_new_mount fs/namespace.c:2990 [inline]
 path_mount+0x14c6/0x1fa0 fs/namespace.c:3318
 do_mount fs/namespace.c:3331 [inline]
 __do_sys_mount fs/namespace.c:3539 [inline]
 __se_sys_mount fs/namespace.c:3516 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3516
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f5f69903519
RSP: 002b:00007f5f698932f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f5f6998c4f0 RCX: 00007f5f69903519
RDX: 0000000020000200 RSI: 0000000020000000 RDI: 0000000000000000
RBP: 00007f5f69959084 R08: 0000000020000600 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e
R13: 6c756e2f7665642f R14: 64663d736e617274 R15: 00007f5f6998c4f8
INFO: task syz-executor573:7687 can't die for more than 143 seconds.
task:syz-executor573 state:D stack:27624 pid: 7687 ppid:  6548 flags:0x00004004
Call Trace:
 context_switch kernel/sched/core.c:4955 [inline]
 __schedule+0x940/0x26f0 kernel/sched/core.c:6236
 schedule+0xd3/0x270 kernel/sched/core.c:6315
 rwsem_down_write_slowpath+0x7b9/0x11d0 kernel/locking/rwsem.c:1107
 __down_write_common kernel/locking/rwsem.c:1262 [inline]
 __down_write_common kernel/locking/rwsem.c:1259 [inline]
 __down_write kernel/locking/rwsem.c:1271 [inline]
 down_write+0x137/0x150 kernel/locking/rwsem.c:1518
 inode_lock include/linux/fs.h:786 [inline]
 lock_mount+0x8a/0x2e0 fs/namespace.c:2242
 do_new_mount_fc fs/namespace.c:2931 [inline]
 do_new_mount fs/namespace.c:2990 [inline]
 path_mount+0x14c6/0x1fa0 fs/namespace.c:3318
 do_mount fs/namespace.c:3331 [inline]
 __do_sys_mount fs/namespace.c:3539 [inline]
 __se_sys_mount fs/namespace.c:3516 [inline]
 __x64_sys_mount+0x27f/0x300 fs/namespace.c:3516
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f5f69903519
RSP: 002b:00007f5f698b42f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f5f6998c4e0 RCX: 00007f5f69903519
RDX: 0000000020000200 RSI: 0000000020000000 RDI: 0000000000000000
RBP: 00007f5f69959084 R08: 0000000020000600 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e
R13: 6c756e2f7665642f R14: 64663d736e617274 R15: 00007f5f6998c4e8

Showing all locks held in the system:
1 lock held by khungtaskd/26:
 #0: ffffffff8b980460 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446
1 lock held by in:imklog/6237:
 #0: ffff88807323d270 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990
1 lock held by syz-executor573/7293:
 #0: ffff88806ba09bf8 (&sb->s_type->i_mutex_key#17){++++}-{3:3}, at: inode_lock include/linux/fs.h:786 [inline]
 #0: ffff88806ba09bf8 (&sb->s_type->i_mutex_key#17){++++}-{3:3}, at: lock_mount+0x8a/0x2e0 fs/namespace.c:2242
1 lock held by syz-executor573/7687:
 #0: ffff88806ba09bf8 (&sb->s_type->i_mutex_key#17){++++}-{3:3}, at: inode_lock include/linux/fs.h:786 [inline]
 #0: ffff88806ba09bf8 (&sb->s_type->i_mutex_key#17){++++}-{3:3}, at: lock_mount+0x8a/0x2e0 fs/namespace.c:2242
2 locks held by syz-executor573/7743:
 #0: ffff888073224870 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:990
 #1: ffff88806ba09bf8 (&sb->s_type->i_mutex_key#17){++++}-{3:3}, at: iterate_dir+0xcd/0x700 fs/readdir.c:55
2 locks held by syz-executor573/7824:
2 locks held by syz-executor573/8046:
3 locks held by syz-executor573/8048:

=============================================

Crashes (75):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci-upstream-linux-next-kasan-gce-root	2021/09/18 02:55	linux-next	9004fd387338	70b76c1d	.config	log	report	syz	C		INFO: task can't die in lock_mount
ci-upstream-linux-next-kasan-gce-root	2021/11/21 23:08	linux-next	5191249f8803	4eb20a4e	.config	log	report			info	INFO: task can't die in lock_mount
ci-upstream-linux-next-kasan-gce-root	2021/03/03 08:00	linux-next	92f791ebd25b	e5b64d68	.config	log	report			info	INFO: task can't die in lock_mount
ci-upstream-linux-next-kasan-gce-root	2021/03/02 05:27	linux-next	92f791ebd25b	183afb6c	.config	log	report			info	INFO: task can't die in lock_mount
ci-upstream-linux-next-kasan-gce-root	2021/02/06 19:45	linux-next	aa2b88209686	0655e081	.config	log	report			info	INFO: task can't die in lock_mount
ci-upstream-linux-next-kasan-gce-root	2021/02/04 16:18	linux-next	0e2c50f40b7f	42b90a7c	.config	log	report			info	INFO: task can't die in lock_mount
ci-upstream-linux-next-kasan-gce-root	2021/01/30 02:29	linux-next	b01f250d83f6	fc9fd31e	.config	log	report			info	INFO: task can't die in lock_mount
ci-upstream-linux-next-kasan-gce-root	2021/01/28 07:26	linux-next	bc085f8fc88f	eefc07f2	.config	log	report			info	INFO: task can't die in lock_mount
ci-upstream-linux-next-kasan-gce-root	2021/01/23 15:12	linux-next	bc085f8fc88f	52e37319	.config	log	report			info	INFO: task can't die in lock_mount
ci-upstream-linux-next-kasan-gce-root	2021/01/20 15:32	linux-next	647060f3b592	d4f4eca5	.config	log	report			info	INFO: task can't die in lock_mount
ci-upstream-linux-next-kasan-gce-root	2021/01/20 00:55	linux-next	b4bb878f3eb3	63631df1	.config	log	report			info	INFO: task can't die in lock_mount
ci-upstream-linux-next-kasan-gce-root	2021/01/20 00:42	linux-next	b4bb878f3eb3	63631df1	.config	log	report			info	INFO: task can't die in lock_mount
ci-upstream-linux-next-kasan-gce-root	2021/01/19 16:23	linux-next	b4bb878f3eb3	63631df1	.config	log	report			info	INFO: task can't die in lock_mount
ci-upstream-linux-next-kasan-gce-root	2021/01/18 22:00	linux-next	93bf8b946e5f	63631df1	.config	log	report			info	INFO: task can't die in lock_mount
ci-upstream-linux-next-kasan-gce-root	2021/01/15 16:36	linux-next	b3a3cbdec55b	65a7a854	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2021/01/13 15:41	linux-next	aa515cdce7a1	a945f0a3	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2021/01/13 02:53	linux-next	df869cab4b35	0cdd6185	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2021/01/11 13:22	linux-next	ef8b014ee4a1	2c1f2513	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2021/01/10 05:42	linux-next	1c925d2030af	2c1f2513	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2021/01/09 14:02	linux-next	1c925d2030af	a6c52263	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2021/01/09 05:03	linux-next	1c925d2030af	c104d4a3	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2021/01/08 01:25	linux-next	2d3811a4fb23	c104d4a3	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2021/01/07 13:18	linux-next	2d3811a4fb23	c104d4a3	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2021/01/07 11:43	linux-next	2d3811a4fb23	c104d4a3	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2021/01/06 05:00	linux-next	83dadd4cfb0c	b1c228e1	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2021/01/03 01:51	linux-next	d7a03a44a5e9	79264ae3	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2021/01/02 20:17	linux-next	d7a03a44a5e9	79264ae3	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2021/01/01 01:04	linux-next	d7a03a44a5e9	79264ae3	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2021/01/01 00:55	linux-next	d7a03a44a5e9	79264ae3	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/31 00:56	linux-next	d7a03a44a5e9	ecb8c012	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/31 00:33	linux-next	d7a03a44a5e9	ecb8c012	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/31 00:31	linux-next	d7a03a44a5e9	ecb8c012	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/30 11:11	linux-next	d7a03a44a5e9	0fa352f2	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/28 08:00	linux-next	d7a03a44a5e9	2242f77f	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/27 03:31	linux-next	d7a03a44a5e9	821e0b09	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/27 03:07	linux-next	d7a03a44a5e9	821e0b09	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/25 20:28	linux-next	d7a03a44a5e9	b982b3ea	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/25 18:08	linux-next	d7a03a44a5e9	b982b3ea	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/25 17:39	linux-next	d7a03a44a5e9	b982b3ea	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/24 18:59	linux-next	d7a03a44a5e9	c2c1d1dd	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/24 18:14	linux-next	d7a03a44a5e9	c2c1d1dd	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/24 13:12	linux-next	d7a03a44a5e9	c2c1d1dd	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/24 11:02	linux-next	d7a03a44a5e9	c2c1d1dd	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/23 20:23	linux-next	d7a03a44a5e9	c2c1d1dd	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/23 18:56	linux-next	d7a03a44a5e9	c2c1d1dd	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/21 09:35	linux-next	4c6ed015c2a5	04201c06	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/19 03:03	linux-next	0d52778b8710	04201c06	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/18 15:04	linux-next	0d52778b8710	04201c06	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/18 14:15	linux-next	0d52778b8710	04201c06	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/17 14:56	linux-next	90cc8cf2d1ab	04201c06	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/17 00:52	linux-next	26aed0ea32c8	04201c06	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/17 00:45	linux-next	26aed0ea32c8	04201c06	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/16 16:22	linux-next	26aed0ea32c8	f213e07e	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/15 19:19	linux-next	9317f948b0b1	97183ed7	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/15 17:47	linux-next	9317f948b0b1	97183ed7	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/15 17:29	linux-next	9317f948b0b1	97183ed7	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/15 17:28	linux-next	9317f948b0b1	97183ed7	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/15 17:28	linux-next	9317f948b0b1	97183ed7	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/15 17:27	linux-next	9317f948b0b1	97183ed7	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/15 17:20	linux-next	9317f948b0b1	97183ed7	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/15 16:18	linux-next	9317f948b0b1	97183ed7	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/15 16:02	linux-next	9317f948b0b1	97183ed7	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/15 15:48	linux-next	9317f948b0b1	97183ed7	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/15 15:34	linux-next	9317f948b0b1	97183ed7	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/15 15:33	linux-next	9317f948b0b1	97183ed7	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/12/15 15:04	linux-next	9317f948b0b1	97183ed7	.config	log	report			info