INFO: task hung in xlog_grant_head

INFO: task hung in xlog_grant_head_check
Status: upstream: reported C repro on 2018/05/21 17:55
Reported-by: syzbot+568245b88fbaedcb1959@syzkaller.appspotmail.com
First crash: 641d, last: 9d07h

Cause bisection: the bug happens on the oldest tested release
Crash: INFO: task hung in xlog_grant_head_check (log)
Repro: C syz .config

similar bugs (2):
Kernel	Title	Repro	Bisected	Count	Last	Reported	Patched	Status
linux-4.14	INFO: task hung in xlog_grant_head_check	C		2	10d	10d	0/1	upstream: reported C repro on 2020/02/10 12:53
linux-4.19	INFO: task hung in xlog_grant_head_check			1	239d	239d	0/1	auto-closed as invalid on 2019/10/25 08:51

Sample crash report:

        (ptrval): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
        (ptrval): 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
XFS (loop0): metadata I/O error in "xfs_trans_read_buf_map" at daddr 0x2 len 1 error 117
XFS (loop0): xfs_imap_lookup: xfs_ialloc_read_agi() returned error -117, agno 0
XFS (loop0): failed to read root inode
INFO: task syz-executor060:4501 blocked for more than 120 seconds.
      Not tainted 4.17.0-rc5+ #60
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor060 D17168  4501   4499 0x00000000
Call Trace:
 context_switch kernel/sched/core.c:2859 [inline]
 __schedule+0x801/0x1e30 kernel/sched/core.c:3501
 schedule+0xef/0x430 kernel/sched/core.c:3545
 xlog_grant_head_wait+0x260/0xf80 fs/xfs/xfs_log.c:275
 xlog_grant_head_check+0x4d6/0x550 fs/xfs/xfs_log.c:337
 xfs_log_reserve+0x398/0xd20 fs/xfs/xfs_log.c:466
 xfs_log_unmount_write+0x2c4/0xfb0 fs/xfs/xfs_log.c:885
 xfs_log_quiesce+0xf9/0x130 fs/xfs/xfs_log.c:1011
 xfs_log_unmount+0x22/0xb0 fs/xfs/xfs_log.c:1025
 xfs_log_mount_cancel+0x44/0x60 fs/xfs/xfs_log.c:828
 xfs_mountfs+0x17d9/0x2b80 fs/xfs/xfs_mount.c:1041
 xfs_fs_fill_super+0xdef/0x1560 fs/xfs/xfs_super.c:1734
 mount_bdev+0x30c/0x3e0 fs/super.c:1164
 xfs_fs_mount+0x34/0x40 fs/xfs/xfs_super.c:1801
 mount_fs+0xae/0x328 fs/super.c:1267
 vfs_kern_mount.part.34+0xd4/0x4d0 fs/namespace.c:1037
 vfs_kern_mount fs/namespace.c:1027 [inline]
 do_new_mount fs/namespace.c:2518 [inline]
 do_mount+0x564/0x3070 fs/namespace.c:2848
 ksys_mount+0x12d/0x140 fs/namespace.c:3064
 __do_sys_mount fs/namespace.c:3078 [inline]
 __se_sys_mount fs/namespace.c:3075 [inline]
 __x64_sys_mount+0xbe/0x150 fs/namespace.c:3075
 do_syscall_64+0x1b1/0x800 arch/x86/entry/common.c:287
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x442d9a
RSP: 002b:00007ffc7a9dde88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000442d9a
RDX: 0000000020000040 RSI: 0000000020000100 RDI: 00007ffc7a9dde90
RBP: 0000000000000004 R08: 00000000200001c0 R09: 000000000000000a
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000401c00
R13: 0000000000401c90 R14: 0000000000000000 R15: 0000000000000000

Showing all locks held in the system:
2 locks held by khungtaskd/893:
 #0:         (ptrval) (rcu_read_lock){....}, at: check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline]
 #0:         (ptrval) (rcu_read_lock){....}, at: watchdog+0x1ff/0xf60 kernel/hung_task.c:249
 #1:         (ptrval) (tasklist_lock){.+.+}, at: debug_show_all_locks+0xde/0x34a kernel/locking/lockdep.c:4470
1 lock held by rsyslogd/4384:
 #0:         (ptrval) (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1a9/0x1e0 fs/file.c:766
2 locks held by getty/4474:
 #0:         (ptrval) (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
 #1:         (ptrval) (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131
2 locks held by getty/4475:
 #0:         (ptrval) (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
 #1:         (ptrval) (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131
2 locks held by getty/4476:
 #0:         (ptrval) (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
 #1:         (ptrval) (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131
2 locks held by getty/4477:
 #0:         (ptrval) (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
 #1:         (ptrval) (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131
2 locks held by getty/4478:
 #0:         (ptrval) (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
 #1:         (ptrval) (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131
2 locks held by getty/4479:
 #0:         (ptrval) (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
 #1:         (ptrval) (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131
2 locks held by getty/4480:
 #0:         (ptrval) (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
 #1:         (ptrval) (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x321/0x1cc0 drivers/tty/n_tty.c:2131
1 lock held by syz-executor060/4501:
 #0:         (ptrval) (&type->s_umount_key#36/1){+.+.}, at: alloc_super fs/super.c:213 [inline]
 #0:         (ptrval) (&type->s_umount_key#36/1){+.+.}, at: sget_userns+0x2dd/0xf00 fs/super.c:506

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

NMI backtrace for cpu 0
CPU: 0 PID: 893 Comm: khungtaskd Not tainted 4.17.0-rc5+ #60
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+0x1b9/0x294 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold.4+0x19/0xce lib/nmi_backtrace.c:103
 nmi_trigger_cpumask_backtrace+0x151/0x192 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline]
 check_hung_task kernel/hung_task.c:132 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline]
 watchdog+0xc10/0xf60 kernel/hung_task.c:249
 kthread+0x345/0x410 kernel/kthread.c:240
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54

Fix bisection attempts:
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro
ci-upstream-kasan-gce-root	2020/02/12 01:39	upstream	359c92c0	f48c20b8	.config	log	report	syz	C
ci-upstream-kasan-gce-root	2020/01/13 01:06	upstream	040a3c33	f48c20b8	.config	log	report	syz	C
ci-upstream-kasan-gce-root	2019/12/11 05:46	upstream	6794862a	f48c20b8	.config	log	report	syz	C
ci-upstream-kasan-gce-root	2019/08/13 01:40	upstream	203ec2fe	f48c20b8	.config	log	report	syz	C

Crashes (32):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	Maintainers
ci-upstream-kasan-gce-root	2018/05/20 18:12	upstream	203ec2fe	f48c20b8	.config	log	report	syz	C	darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2019/02/16 17:08	upstream	5ded5871	f42dee6d	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-kasan-gce-selinux-root	2019/02/11 02:37	upstream	df3865f8	b4f792e4	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-kasan-gce-selinux-root	2019/02/08 23:48	upstream	74e96711	fa6c7b70	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-kasan-gce-selinux-root	2019/02/03 14:09	upstream	12491ed3	c198d5dd	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-kasan-gce-root	2019/02/03 14:03	upstream	12491ed3	c198d5dd	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2019/01/21 02:01	upstream	6e693b3f	fd37a550	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-kasan-gce-root	2019/01/21 01:52	upstream	6e693b3f	fd37a550	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2019/01/15 21:35	upstream	fe76fc6a	79cb1a7c	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-kasan-gce-root	2019/01/10 07:00	upstream	4064e47c	45c0c1b1	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2019/01/09 19:33	upstream	a88cc8da	45c0c1b1	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-kasan-gce-root	2018/12/25 16:12	upstream	8fe28cb5	8a41a0ad	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-kasan-gce-root	2018/12/16 03:05	upstream	6531e115	def91db3	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2018/12/16 01:51	upstream	6531e115	def91db3	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-kasan-gce-root	2018/12/15 13:52	upstream	6531e115	c9128939	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2018/12/11 16:11	upstream	f5d58277	7795ae03	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-kasan-gce-root	2018/12/10 16:30	upstream	40e020c1	6565f24d	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-kasan-gce-root	2018/12/09 17:05	upstream	8214bdf7	979179d6	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-kasan-gce-selinux-root	2018/12/03 16:43	upstream	25956467	819002b0	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-kasan-gce-selinux-root	2018/11/25 14:29	upstream	e195ca6c	3d3ec907	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-kasan-gce-smack-root	2018/11/10 11:55	upstream	aa4330e1	f9815aaf	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-kasan-gce-root	2018/10/10 02:17	upstream	64c5e530	8b311eaf	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-kasan-gce-selinux-root	2018/10/05 15:41	upstream	befad944	8b311eaf	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2019/02/18 17:05	linux-next	cb916fc5	59f36113	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2019/02/11 19:58	linux-next	d4104460	73f5f452	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2019/02/04 18:58	linux-next	dc4c8999	d672172c	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2019/01/26 02:58	linux-next	494367cb	ebf7a37c	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2019/01/17 19:52	linux-next	a37d50ca	769e75ed	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2019/01/12 05:31	linux-next	b808822a	c3f3344c	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2018/12/05 04:26	linux-next	442b8cea	f162ad97	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2018/10/16 01:15	linux-next	ca0591d0	8cd30605	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org
ci-upstream-linux-next-kasan-gce-root	2018/10/12 02:44	linux-next	771b65e8	ba6ddb43	.config	log	report			darrick.wong@oracle.com, linux-kernel@vger.kernel.org, linux-xfs@vger.kernel.org