INFO: task hung in do

[upstream] INFO: task hung in do_exit
Status: moderation: reported on 2018/04/23 01:02
Reported-by: syzbot+8a19c77ce070f0d4d3bb@syzkaller.appspotmail.com
First crash: 336d, last: 6d16h

Sample crash report:

INFO: task syz-executor.2:28225 blocked for more than 143 seconds.
      Not tainted 5.0.0+ #25
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2  D28384 28225   7802 0x80000000
Call Trace:
 context_switch kernel/sched/core.c:2877 [inline]
 __schedule+0x817/0x1cc0 kernel/sched/core.c:3518
 schedule+0x92/0x180 kernel/sched/core.c:3562
 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:285 [inline]
 rwsem_down_read_failed+0x213/0x420 kernel/locking/rwsem-xadd.c:302
 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 __down_read arch/x86/include/asm/rwsem.h:83 [inline]
 down_read+0x49/0x90 kernel/locking/rwsem.c:26
 exit_mm kernel/exit.c:512 [inline]
 do_exit+0x443/0x2fa0 kernel/exit.c:863
 do_group_exit+0x135/0x370 kernel/exit.c:980
 __do_sys_exit_group kernel/exit.c:991 [inline]
 __se_sys_exit_group kernel/exit.c:989 [inline]
 __x64_sys_exit_group+0x44/0x50 kernel/exit.c:989
 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458079
Code: Bad RIP value.
RSP: 002b:0000000000a4fd58 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 000000000000001e RCX: 0000000000458079
RDX: 0000000000411e31 RSI: fffffffffffffff7 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000091092 R09: 0000000000a4fdb0
R10: 0000000000091092 R11: 0000000000000246 R12: 0000000000000001
R13: 0000000000a4fdb0 R14: 0000000000000000 R15: 0000000000a4fdc0
INFO: task syz-executor.2:28234 blocked for more than 143 seconds.
      Not tainted 5.0.0+ #25
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2  D29680 28234   7802 0x80000000
Call Trace:
 context_switch kernel/sched/core.c:2877 [inline]
 __schedule+0x817/0x1cc0 kernel/sched/core.c:3518
 schedule+0x92/0x180 kernel/sched/core.c:3562
 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:285 [inline]
 rwsem_down_read_failed+0x213/0x420 kernel/locking/rwsem-xadd.c:302
 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 __down_read arch/x86/include/asm/rwsem.h:83 [inline]
 down_read+0x49/0x90 kernel/locking/rwsem.c:26
 exit_mm kernel/exit.c:512 [inline]
 do_exit+0x443/0x2fa0 kernel/exit.c:863
 do_group_exit+0x135/0x370 kernel/exit.c:980
 get_signal+0x399/0x1d50 kernel/signal.c:2575
 do_signal+0x87/0x1940 arch/x86/kernel/signal.c:816
 exit_to_usermode_loop+0x244/0x2c0 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x52d/0x610 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458079
Code: Bad RIP value.
RSP: 002b:00007f0999700cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 000000000073bfa8 RCX: 0000000000458079
RDX: 00000000004c07d0 RSI: 0000000000000081 RDI: 000000000073bfac
RBP: 000000000073bfa0 R08: 0000000000000019 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 000000000073bfac
R13: 0000000000a4fb5f R14: 00007f09997019c0 R15: 000000000073bfac

Showing all locks held in the system:
1 lock held by khungtaskd/1042:
 #0: 00000000e16bd2ac (rcu_read_lock){....}, at: debug_show_all_locks+0x5f/0x27e kernel/locking/lockdep.c:5061
1 lock held by rsyslogd/7649:
 #0: 00000000e2e6df2b (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xee/0x110 fs/file.c:801
2 locks held by getty/7761:
 #0: 000000001add230d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 000000005c1d9542 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by getty/7762:
 #0: 000000000d5d8d88 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 000000001f987574 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by getty/7763:
 #0: 000000003604f826 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 00000000bd102fe3 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by getty/7764:
 #0: 0000000093603c29 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 000000001999b869 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by getty/7765:
 #0: 000000001aa89689 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 00000000d7f5b15c (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by getty/7766:
 #0: 000000009b58faeb (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 00000000a82ab2ca (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
2 locks held by getty/7767:
 #0: 000000007be84cd2 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x33/0x40 drivers/tty/tty_ldsem.c:341
 #1: 000000004b400bbd (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x232/0x1b70 drivers/tty/n_tty.c:2156
1 lock held by syz-executor.0/18419:
 #0: 000000009c42ebf4 (&sig->cred_guard_mutex){+.+.}, at: prepare_bprm_creds fs/exec.c:1407 [inline]
 #0: 000000009c42ebf4 (&sig->cred_guard_mutex){+.+.}, at: __do_execve_file.isra.0+0x376/0x23f0 fs/exec.c:1750
1 lock held by syz-executor.2/28225:
 #0: 000000004d25620a (&mm->mmap_sem){++++}, at: exit_mm kernel/exit.c:512 [inline]
 #0: 000000004d25620a (&mm->mmap_sem){++++}, at: do_exit+0x443/0x2fa0 kernel/exit.c:863
1 lock held by syz-executor.2/28226:
1 lock held by syz-executor.2/28234:
 #0: 000000004d25620a (&mm->mmap_sem){++++}, at: exit_mm kernel/exit.c:512 [inline]
 #0: 000000004d25620a (&mm->mmap_sem){++++}, at: do_exit+0x443/0x2fa0 kernel/exit.c:863

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

NMI backtrace for cpu 0
CPU: 0 PID: 1042 Comm: khungtaskd Not tainted 5.0.0+ #25
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+0x172/0x1f0 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1be/0x236 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:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:204 [inline]
 watchdog+0x9b7/0xec0 kernel/hung_task.c:288
 kthread+0x357/0x430 kernel/kthread.c:253
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 0 to CPUs 1:

All crashes (35):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Maintainers
ci-upstream-kasan-gce	2019/03/16 23:50	upstream	9c7dc824	bab43553	.config	log	report	akpm@linux-foundation.org, andrea.parri@amarulasolutions.com, ap420073@gmail.com, avagin@gmail.com, ebiederm@xmission.com, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, oleg@redhat.com, prsood@codeaurora.org, tj@kernel.org
ci-upstream-kasan-gce-smack-root	2019/03/15 10:04	upstream	f261c4e5	bab43553	.config	log	report	andrea.parri@amarulasolutions.com, ap420073@gmail.com, avagin@gmail.com, dbueso@suse.de, ebiederm@xmission.com, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, mingo@kernel.org, oleg@redhat.com, prsood@codeaurora.org
ci-upstream-kasan-gce-smack-root	2019/03/14 22:19	upstream	3b319ee2	d72db19b	.config	log	report	andrea.parri@amarulasolutions.com, avagin@gmail.com, ebiederm@xmission.com, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, mcgrof@kernel.org, oleg@redhat.com, prsood@codeaurora.org
ci-upstream-kasan-gce	2019/03/13 18:49	upstream	ebc551f2	2881fc25	.config	log	report	akpm@linux-foundation.org, ap420073@gmail.com, avagin@gmail.com, ebiederm@xmission.com, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, oleg@redhat.com, prsood@codeaurora.org
ci-upstream-kasan-gce-smack-root	2019/03/08 07:36	upstream	1fc1cd83	4b69c3cb	.config	log	report	ap420073@gmail.com, avagin@gmail.com, dbueso@suse.de, ebiederm@xmission.com, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, oleg@redhat.com, prsood@codeaurora.org
ci-upstream-kasan-gce-smack-root	2019/02/06 07:53	upstream	8834f560	d672172c	.config	log	report	ap420073@gmail.com, avagin@gmail.com, dbueso@suse.de, ebiederm@xmission.com, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, mingo@kernel.org, oleg@redhat.com, prsood@codeaurora.org
ci-upstream-kasan-gce-smack-root	2018/12/27 18:01	upstream	fc2fd5f0	43cf01dd	.config	log	report	akpm@linux-foundation.org, arnd@arndb.de, ebiederm@xmission.com, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, mcgrof@kernel.org
ci-upstream-kasan-gce-smack-root	2018/11/20 08:59	upstream	f2ce1065	9bc2a903	.config	log	report	akpm@linux-foundation.org, ebiederm@xmission.com, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, mcgrof@kernel.org, sudipm.mukherjee@gmail.com
ci-upstream-kasan-gce-root	2018/11/16 13:59	upstream	da5322e6	f5e275d1	.config	log	report	akpm@linux-foundation.org, arnd@arndb.de, ebiederm@xmission.com, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, mcgrof@kernel.org, sudipm.mukherjee@gmail.com
ci-upstream-kasan-gce-root	2018/10/14 23:49	upstream	3a272031	caf12900	.config	log	report	akpm@linux-foundation.org, arnd@arndb.de, ebiederm@xmission.com, keescook@chromium.org, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, mark.rutland@arm.com, mcgrof@kernel.org, sudipm.mukherjee@gmail.com
ci-upstream-kasan-gce-selinux-root	2018/10/03 19:00	upstream	6bebe379	8b311eaf	.config	log	report	akpm@linux-foundation.org, ebiederm@xmission.com, keescook@chromium.org, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, mark.rutland@arm.com, mingo@kernel.org, sudipm.mukherjee@gmail.com
ci-upstream-kasan-gce-root	2018/07/21 01:15	upstream	28c20cc7	af255b09	.config	log	report	akpm@linux-foundation.org, ebiederm@xmission.com, keescook@chromium.org, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, mark.rutland@arm.com, mingo@kernel.org, paulmck@linux.vnet.ibm.com, sudipm.mukherjee@gmail.com, viro@zeniv.linux.org.uk
ci-upstream-net-kasan-gce	2018/04/20 23:48	net-next	0263ea5c	cc402841	.config	log	report	akpm@linux-foundation.org, keescook@chromium.org, linux-kernel@vger.kernel.org, mingo@kernel.org, paulmck@linux.vnet.ibm.com, viro@zeniv.linux.org.uk
ci-upstream-linux-next-kasan-gce-root	2019/03/04 22:56	linux-next	5d57915a	7c693b52	.config	log	report	ap420073@gmail.com, avagin@gmail.com, ebiederm@xmission.com, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, oleg@redhat.com, prsood@codeaurora.org, tj@kernel.org
ci-upstream-linux-next-kasan-gce-root	2019/03/04 05:08	linux-next	c63e9e91	1c0e457a	.config	log	report	ap420073@gmail.com, avagin@gmail.com, dbueso@suse.de, ebiederm@xmission.com, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, mcgrof@kernel.org, oleg@redhat.com, prsood@codeaurora.org
ci-upstream-linux-next-kasan-gce-root	2019/03/04 01:21	linux-next	c63e9e91	1c0e457a	.config	log	report	ap420073@gmail.com, avagin@gmail.com, davem@davemloft.net, ebiederm@xmission.com, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, oleg@redhat.com, peterz@infradead.org, prsood@codeaurora.org, tj@kernel.org
ci-upstream-linux-next-kasan-gce-root	2019/02/24 12:37	linux-next	94a47529	7a06e792	.config	log	report	andrea.parri@amarulasolutions.com, ap420073@gmail.com, avagin@gmail.com, dbueso@suse.de, ebiederm@xmission.com, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, oleg@redhat.com, prsood@codeaurora.org, tj@kernel.org
ci-upstream-linux-next-kasan-gce-root	2019/02/11 06:22	linux-next	a46228f6	b4f792e4	.config	log	report	ap420073@gmail.com, avagin@gmail.com, dbueso@suse.de, ebiederm@xmission.com, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, oleg@redhat.com, prsood@codeaurora.org
ci-upstream-linux-next-kasan-gce-root	2019/02/10 23:44	linux-next	a46228f6	b4f792e4	.config	log	report	ap420073@gmail.com, avagin@gmail.com, dbueso@suse.de, ebiederm@xmission.com, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, mcgrof@kernel.org, oleg@redhat.com, prsood@codeaurora.org
ci-upstream-linux-next-kasan-gce-root	2019/02/09 11:52	linux-next	a46228f6	fa6c7b70	.config	log	report	avagin@gmail.com, ebiederm@xmission.com, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, mcgrof@kernel.org, oleg@redhat.com, prsood@codeaurora.org, tj@kernel.org
ci-upstream-linux-next-kasan-gce-root	2019/02/04 09:13	linux-next	dc4c8999	c198d5dd	.config	log	report	avagin@gmail.com, dbueso@suse.de, ebiederm@xmission.com, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, mingo@kernel.org, oleg@redhat.com, prsood@codeaurora.org
ci-upstream-linux-next-kasan-gce-root	2019/01/29 07:13	linux-next	39ad1c1b	aa432daf	.config	log	report	andrea.parri@amarulasolutions.com, ap420073@gmail.com, avagin@gmail.com, ebiederm@xmission.com, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, peterz@infradead.org, prsood@codeaurora.org
ci-upstream-linux-next-kasan-gce-root	2019/01/23 22:25	linux-next	5b74ce50	56558f63	.config	log	report	ap420073@gmail.com, avagin@gmail.com, ebiederm@xmission.com, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, mingo@kernel.org, prsood@codeaurora.org, sfr@canb.auug.org.au
ci-upstream-linux-next-kasan-gce-root	2019/01/22 06:27	linux-next	5b22549b	badbbeee	.config	log	report	avagin@gmail.com, davem@davemloft.net, ebiederm@xmission.com, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, mcgrof@kernel.org, prsood@codeaurora.org, sfr@canb.auug.org.au
ci-upstream-linux-next-kasan-gce-root	2019/01/20 16:12	linux-next	9673b4aa	fd37a550	.config	log	report	ap420073@gmail.com, avagin@gmail.com, davem@davemloft.net, ebiederm@xmission.com, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, mcgrof@kernel.org
ci-upstream-linux-next-kasan-gce-root	2019/01/15 04:36	linux-next	5aa6589e	ebacf5cb	.config	log	report	akpm@linux-foundation.org, ap420073@gmail.com, avagin@gmail.com, ebiederm@xmission.com, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, mcgrof@kernel.org
ci-upstream-linux-next-kasan-gce-root	2019/01/13 07:02	linux-next	b808822a	c3f3344c	.config	log	report	akpm@linux-foundation.org, avagin@gmail.com, ebiederm@xmission.com, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, mcgrof@kernel.org, sfr@canb.auug.org.au
ci-upstream-linux-next-kasan-gce-root	2019/01/12 07:39	linux-next	b808822a	c3f3344c	.config	log	report	avagin@gmail.com, ebiederm@xmission.com, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, mcgrof@kernel.org, sfr@canb.auug.org.au
ci-upstream-linux-next-kasan-gce-root	2019/01/12 01:13	linux-next	b808822a	c3f3344c	.config	log	report	akpm@linux-foundation.org, avagin@gmail.com, ebiederm@xmission.com, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, mcgrof@kernel.org
ci-upstream-linux-next-kasan-gce-root	2019/01/09 05:09	linux-next	d6e77253	010ed08b	.config	log	report	akpm@linux-foundation.org, avagin@gmail.com, ebiederm@xmission.com, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, mcgrof@kernel.org
ci-upstream-linux-next-kasan-gce-root	2018/11/08 08:53	linux-next	f7af6d2c	e85d2a61	.config	log	report	akpm@linux-foundation.org, arnd@arndb.de, ebiederm@xmission.com, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, mcgrof@kernel.org, sudipm.mukherjee@gmail.com
ci-upstream-linux-next-kasan-gce-root	2018/10/07 12:05	linux-next	12ffaa11	8b311eaf	.config	log	report	akpm@linux-foundation.org, ebiederm@xmission.com, keescook@chromium.org, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, mark.rutland@arm.com, mcgrof@kernel.org, paulmck@linux.vnet.ibm.com, sudipm.mukherjee@gmail.com
ci-upstream-linux-next-kasan-gce-root	2018/10/02 07:10	linux-next	4794a36b	e06f7713	.config	log	report	akpm@linux-foundation.org, arnd@arndb.de, ebiederm@xmission.com, keescook@chromium.org, linux-kernel@vger.kernel.org, linux@dominikbrodowski.net, mark.rutland@arm.com, mcgrof@kernel.org, sudipm.mukherjee@gmail.com
ci-upstream-linux-next-kasan-gce-root	2018/09/03 20:17	linux-next	dceb9092	a4718693	.config	log	report	akpm@linux-foundation.org, ebiederm@xmission.com, keescook@chromium.org, linux-kernel@vger.kernel.org, mcgrof@kernel.org, sudipm.mukherjee@gmail.com, viro@zeniv.linux.org.uk
ci-upstream-linux-next-kasan-gce-root	2018/07/30 08:29	linux-next	d1e0b8e0	1a381291	.config	log	report	akpm@linux-foundation.org, byungchul.park@lge.com, j@bitron.ch, keescook@chromium.org, linux-kernel@vger.kernel.org, mingo@kernel.org, paulmck@linux.vnet.ibm.com, sudipm.mukherjee@gmail.com, viro@zeniv.linux.org.uk