INFO: task hung in synchronize

INFO: task hung in synchronize_rcu (3)
Status: upstream: reported C repro on 2020/07/22 18:22
Reported-by: syzbot+0c6da80218456f1edc36@syzkaller.appspotmail.com
First crash: 507d, last: 1d02h

Cause bisection: introduced by (bisect log) :
commit 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22
Author: Vinicius Costa Gomes <vinicius.gomes@intel.com>
Date: Sat Sep 29 00:59:43 2018 +0000

tc: Add support for configuring the taprio scheduler

Crash: INFO: rcu detected stall in smp_call_function (log)
Repro: C syz .config

similar bugs (6):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
android-49	INFO: task hung in synchronize_rcu				1	509d	509d	0/3	auto-closed as invalid on 2020/03/28 16:57
linux-4.14	INFO: task hung in synchronize_rcu	C		error	100	4d17h	531d	0/1	upstream: reported C repro on 2019/11/07 04:32
linux-4.19	INFO: task hung in synchronize_rcu				20	2d20h	530d	0/1	upstream: reported on 2019/11/08 21:27
upstream	INFO: task hung in synchronize_rcu	syz	done		1206	509d	535d	15/22	fixed on 2019/11/29 15:48
android-414	INFO: task hung in synchronize_rcu				1	527d	527d	0/1	auto-closed as invalid on 2020/03/10 10:42
upstream	INFO: task hung in synchronize_rcu (2)				8	508d	509d	0/22	closed as invalid on 2019/11/30 16:54

Sample crash report:

INFO: task kworker/0:5:2530 blocked for more than 144 seconds.
      Not tainted 5.8.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/0:5     D26496  2530      2 0x00004000
Workqueue: events free_ipc
Call Trace:
 context_switch kernel/sched/core.c:3458 [inline]
 __schedule+0x91f/0x2250 kernel/sched/core.c:4215
 schedule+0xd0/0x2a0 kernel/sched/core.c:4290
 schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1884
 do_wait_for_common kernel/sched/completion.c:85 [inline]
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion+0x163/0x260 kernel/sched/completion.c:138
 __wait_rcu_gp+0x217/0x2d0 kernel/rcu/update.c:411
 synchronize_rcu+0x10a/0x180 kernel/rcu/tree.c:3430
 kern_unmount fs/namespace.c:3861 [inline]
 kern_unmount+0x67/0xe0 fs/namespace.c:3856
 free_ipc_ns ipc/namespace.c:123 [inline]
 free_ipc+0xbe/0x1b0 ipc/namespace.c:141
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
INFO: task syz-executor643:6834 blocked for more than 144 seconds.
      Not tainted 5.8.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor643 D24000  6834   6833 0xa0024002
Call Trace:
 context_switch kernel/sched/core.c:3458 [inline]
 __schedule+0x91f/0x2250 kernel/sched/core.c:4215
 schedule+0xd0/0x2a0 kernel/sched/core.c:4290
 schedule_timeout+0x1d8/0x250 kernel/time/timer.c:1884
 do_wait_for_common kernel/sched/completion.c:85 [inline]
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion+0x163/0x260 kernel/sched/completion.c:138
 rcu_barrier+0x2d1/0x4a0 kernel/rcu/tree.c:3661
 netdev_run_todo+0x100/0xac0 net/core/dev.c:9758
 tun_detach drivers/net/tun.c:711 [inline]
 tun_chr_close+0xf5/0x180 drivers/net/tun.c:3423
 __fput+0x33c/0x880 fs/file_table.c:281
 task_work_run+0xdd/0x190 kernel/task_work.c:135
 exit_task_work include/linux/task_work.h:25 [inline]
 do_exit+0xb72/0x2a40 kernel/exit.c:805
 do_group_exit+0x125/0x310 kernel/exit.c:903
 __do_sys_exit_group kernel/exit.c:914 [inline]
 __se_sys_exit_group kernel/exit.c:912 [inline]
 __ia32_sys_exit_group+0x3a/0x50 kernel/exit.c:912
 do_syscall_32_irqs_on+0x3f/0x60 arch/x86/entry/common.c:428
 __do_fast_syscall_32 arch/x86/entry/common.c:475 [inline]
 do_fast_syscall_32+0x7f/0x120 arch/x86/entry/common.c:503
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c
RIP: 0023:0xf7fef569
Code: Bad RIP value.
RSP: 002b:00000000ffdacd8c EFLAGS: 00000292 ORIG_RAX: 00000000000000fc
RAX: ffffffffffffffda RBX: 0000000000000001 RCX: 00000000080f7b38
RDX: 0000000000000000 RSI: 00000000080dffbc RDI: 00000000080f7b40
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

Showing all locks held in the system:
1 lock held by khungtaskd/1155:
 #0: ffffffff89bc11c0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:5779
2 locks held by kworker/0:5/2530:
 #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline]
 #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic64_set include/asm-generic/atomic-instrumented.h:856 [inline]
 #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: atomic_long_set include/asm-generic/atomic-long.h:41 [inline]
 #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_data kernel/workqueue.c:616 [inline]
 #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: set_work_pool_and_clear_pending kernel/workqueue.c:643 [inline]
 #0: ffff8880aa026d38 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x82b/0x1670 kernel/workqueue.c:2240
 #1: ffffc9000804fda8 (free_ipc_work){+.+.}-{0:0}, at: process_one_work+0x85f/0x1670 kernel/workqueue.c:2244
1 lock held by in:imklog/6529:
 #0: ffff88809f8eadf0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xe9/0x100 fs/file.c:826
1 lock held by syz-executor643/6834:
 #0: ffffffff89bc5728 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x44/0x4a0 kernel/rcu/tree.c:3596

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

NMI backtrace for cpu 1
CPU: 1 PID: 1155 Comm: khungtaskd Not tainted 5.8.0-rc6-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+0x18f/0x20d lib/dump_stack.c:118
 nmi_cpu_backtrace.cold+0x70/0xb1 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1b3/0x223 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline]
 watchdog+0xd7d/0x1000 kernel/hung_task.c:295
 kthread+0x3b5/0x4a0 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.8.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:advance_sched+0x455/0x990 net/sched/sch_taprio.c:747
Code: 08 84 d2 0f 85 99 04 00 00 41 89 6c 24 20 e8 72 be 10 fb 48 b8 00 00 00 00 00 fc ff df 48 8b 54 24 08 48 c1 ea 03 80 3c 02 00 <0f> 85 4c 04 00 00 48 8b 7c 24 18 4c 89 63 e8 e8 d7 64 85 01 48 8d
RSP: 0018:ffffc90000007d78 EFLAGS: 00000046
RAX: dffffc0000000000 RBX: ffff88809dc04b40 RCX: ffffffff8662fdea
RDX: 1ffff11013b80965 RSI: ffffffff8662fe1e RDI: ffff8880a74c71a0
RBP: 0000000000000a00 R08: 0000000000000001 R09: ffff8880a74c71a3
R10: ffffed1014e98e34 R11: 0000000000000000 R12: ffff8880a74c7180
R13: 1623e9f81cc16400 R14: ffff8880a74c71a0 R15: 1623e9f81cc16400
FS:  0000000000000000(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000080a8270 CR3: 0000000009a79000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 __run_hrtimer kernel/time/hrtimer.c:1520 [inline]
 __hrtimer_run_queues+0x6a9/0xfc0 kernel/time/hrtimer.c:1584
 hrtimer_interrupt+0x32a/0x930 kernel/time/hrtimer.c:1646
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1080 [inline]
 __sysvec_apic_timer_interrupt+0x142/0x5e0 arch/x86/kernel/apic/apic.c:1097
 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:711
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline]
 sysvec_apic_timer_interrupt+0xe0/0x120 arch/x86/kernel/apic/apic.c:1091
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:585
RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61
Code: ff 4c 89 ef e8 53 c8 ca f9 e9 8e fe ff ff 48 89 df e8 46 c8 ca f9 eb 8a cc cc cc cc e9 07 00 00 00 0f 00 2d 74 5f 60 00 fb f4 <c3> 90 e9 07 00 00 00 0f 00 2d 64 5f 60 00 f4 c3 cc cc 55 53 e8 29
RSP: 0018:ffffffff89a07c70 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffffffff89a86580 RSI: ffffffff87e85c48 RDI: ffffffff87e85c1e
RBP: ffff8880a7120064 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffff8880a7120064
R13: 1ffffffff1340f98 R14: ffff8880a7120065 R15: 0000000000000001
 arch_safe_halt arch/x86/include/asm/paravirt.h:150 [inline]
 acpi_safe_halt+0x8d/0x110 drivers/acpi/processor_idle.c:111
 acpi_idle_do_entry+0x15c/0x1b0 drivers/acpi/processor_idle.c:525
 acpi_idle_enter+0x3f9/0xab0 drivers/acpi/processor_idle.c:651
 cpuidle_enter_state+0xff/0x960 drivers/cpuidle/cpuidle.c:235
 cpuidle_enter+0x4a/0xa0 drivers/cpuidle/cpuidle.c:346
 call_cpuidle kernel/sched/idle.c:126 [inline]
 cpuidle_idle_call kernel/sched/idle.c:214 [inline]
 do_idle+0x431/0x6d0 kernel/sched/idle.c:276
 cpu_startup_entry+0x14/0x20 kernel/sched/idle.c:372
 start_kernel+0x9cb/0xa06 init/main.c:1043
 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243

Fix bisection attempts:
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci-upstream-kasan-gce-386	2020/11/07 08:02	upstream	659caaf6	21f1765e	.config	log		syz	C
ci-upstream-kasan-gce-386	2020/08/21 00:30	upstream	da2968ff	21f1765e	.config	log		syz	C

Crashes (208):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	Syz repro	C repro	VM info	Title
ci-upstream-kasan-gce-386	2020/07/22 00:02	upstream	4fa640dc	21f1765e	.config	log	report	syz	C
ci-upstream-kasan-gce-selinux-root	2021/02/25 03:46	upstream	719bbd4a	fcc6d71b	.config	log	report			info	INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce-root	2021/02/01 08:51	upstream	1048ba83	fc9fd31e	.config	log	report			info	INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce-selinux-root	2021/02/01 07:44	upstream	1048ba83	fc9fd31e	.config	log	report			info	INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce-386	2021/02/26 18:56	upstream	2c87f7a3	4c37c133	.config	log	report			info	INFO: task hung in synchronize_rcu
ci-upstream-bpf-kasan-gce	2021/04/10 10:42	bpf	afd0be72	bfeda1b1	.config	log	report			info	INFO: task hung in synchronize_rcu
ci-upstream-bpf-kasan-gce	2021/04/09 23:56	bpf	afd0be72	6a81331a	.config	log	report			info	INFO: task hung in synchronize_rcu
ci-upstream-bpf-kasan-gce	2021/04/08 05:06	bpf	144748eb	6a81331a	.config	log	report			info	INFO: task hung in synchronize_rcu
ci-upstream-bpf-kasan-gce	2021/02/25 03:44	bpf	f566aac4	fcc6d71b	.config	log	report			info	INFO: task hung in synchronize_rcu
ci-upstream-bpf-kasan-gce	2021/02/07 13:40	bpf	6183f4d3	2ce644fc	.config	log	report			info	INFO: task hung in synchronize_rcu
ci-upstream-bpf-kasan-gce	2021/02/06 03:34	bpf	6183f4d3	23a562df	.config	log	report			info	INFO: task hung in synchronize_rcu
ci-upstream-bpf-kasan-gce	2021/02/05 13:14	bpf	6183f4d3	23a562df	.config	log	report			info	INFO: task hung in synchronize_rcu
ci-upstream-bpf-kasan-gce	2021/01/31 02:02	bpf	06cc6e5d	fc9fd31e	.config	log	report			info	INFO: task hung in synchronize_rcu
ci-upstream-bpf-next-kasan-gce	2021/04/20 20:35	bpf-next	69443c47	c0ced557	.config	log	report			info	INFO: task hung in synchronize_rcu
ci-upstream-bpf-next-kasan-gce	2021/04/18 12:14	bpf-next	cdf0e80e	7e2b734b	.config	log	report			info	INFO: task hung in synchronize_rcu
ci-upstream-net-kasan-gce	2021/04/17 19:46	net-next	e7ad33fa	7e2b734b	.config	log	report			info	INFO: task hung in synchronize_rcu
ci-upstream-net-kasan-gce	2021/04/08 05:29	net-next	0b35e0de	6a81331a	.config	log	report			info	INFO: task hung in synchronize_rcu
ci-upstream-bpf-next-kasan-gce	2021/04/03 09:37	bpf-next	007bdc12	6a81331a	.config	log	report			info	INFO: task hung in synchronize_rcu
ci-upstream-bpf-next-kasan-gce	2021/03/28 16:29	bpf-next	36e79851	a8529b82	.config	log	report			info	INFO: task hung in synchronize_rcu
ci-upstream-bpf-next-kasan-gce	2021/03/03 08:46	bpf-next	85e142cb	e5b64d68	.config	log	report			info	INFO: task hung in synchronize_rcu
ci-upstream-bpf-next-kasan-gce	2021/03/02 05:30	bpf-next	85e142cb	183afb6c	.config	log	report			info	INFO: task hung in synchronize_rcu
ci-upstream-bpf-next-kasan-gce	2021/02/19 00:05	bpf-next	7b1e385c	14052202	.config	log	report			info	INFO: task hung in synchronize_rcu
ci-upstream-bpf-next-kasan-gce	2021/02/08 19:50	bpf-next	23a2d70c	2ce644fc	.config	log	report			info	INFO: task hung in synchronize_rcu
ci-upstream-bpf-next-kasan-gce	2021/02/07 11:52	bpf-next	23a2d70c	2ce644fc	.config	log	report			info	INFO: task hung in synchronize_rcu
ci-upstream-bpf-next-kasan-gce	2021/01/27 14:45	bpf-next	86ce322d	a0ebf917	.config	log	report			info	INFO: task hung in synchronize_rcu
ci-upstream-bpf-next-kasan-gce	2021/01/25 20:53	bpf-next	6e66fbb1	52e37319	.config	log	report			info	INFO: task hung in synchronize_rcu
ci-upstream-bpf-next-kasan-gce	2021/01/19 08:56	bpf-next	a2c2998d	63631df1	.config	log	report			info	INFO: task hung in synchronize_rcu
ci-upstream-linux-next-kasan-gce-root	2021/04/14 06:35	linux-next	dcf1b51d	a184b83e	.config	log	report			info	INFO: task hung in synchronize_rcu
ci-upstream-kasan-gce-selinux-root	2021/01/10 07:20	upstream	2ff90100	2c1f2513	.config	log	report			info
ci-upstream-kasan-gce-root	2021/01/02 23:56	upstream	3516bd72	79264ae3	.config	log	report			info
ci-upstream-kasan-gce-selinux-root	2020/12/27 20:38	upstream	f838f8d2	2242f77f	.config	log	report			info
ci-upstream-kasan-gce-smack-root	2020/04/11 14:29	upstream	5b8b9d0c	a8c6a3f8	.config	log	report
ci-upstream-kasan-gce	2020/01/22 16:40	upstream	d96d875e	8eda0b95	.config	log	report
ci-upstream-kasan-gce-root	2019/12/01 07:56	upstream	32ef9553	a76bf83f	.config	log	report
ci-upstream-kasan-gce-386	2020/12/27 21:40	upstream	f838f8d2	2242f77f	.config	log	report			info
ci-upstream-bpf-kasan-gce	2020/12/28 04:23	bpf	a61daaf3	2242f77f	.config	log	report			info
ci-upstream-net-this-kasan-gce	2020/06/08 03:32	net	4d3da2d8	7751efd0	.config	log	report
ci-upstream-bpf-next-kasan-gce	2021/01/16 01:18	bpf-next	eed6a9a9	65a7a854	.config	log	report			info
ci-upstream-net-kasan-gce	2021/01/16 01:12	net-next	e7fa5c80	65a7a854	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2021/01/05 20:57	bpf-next	482ec343	a0234d98	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2021/01/03 03:48	bpf-next	482ec343	79264ae3	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2021/01/02 11:19	bpf-next	482ec343	79264ae3	.config	log	report			info
ci-upstream-net-kasan-gce	2020/12/30 15:00	net-next	3db1a3fa	ecb8c012	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/12/29 06:49	bpf-next	00a279e4	8259d56c	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/12/17 00:15	bpf-next	3db1a3fa	04201c06	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/12/16 16:09	bpf-next	3db1a3fa	f213e07e	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/12/16 01:09	bpf-next	0e12c027	97183ed7	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/12/15 17:45	bpf-next	0e12c027	97183ed7	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/12/14 23:09	bpf-next	2e33f831	97183ed7	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/12/13 14:12	bpf-next	b4fe9fec	bca53db9	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/12/11 19:24	bpf-next	b4fe9fec	ba24ffcd	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/12/09 02:17	bpf-next	2f4b0319	a7f7f4a4	.config	log	report			info
ci-upstream-net-kasan-gce	2020/12/08 20:42	net-next	8e98387b	a7f7f4a4	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/12/08 10:49	bpf-next	e1868b9e	51a9082e	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/12/08 06:55	bpf-next	e1868b9e	51a9082e	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/12/06 22:59	bpf-next	34da8721	c521566d	.config	log	report			info
ci-upstream-net-kasan-gce	2020/12/06 21:50	net-next	4054eebf	c521566d	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/12/06 16:23	bpf-next	34da8721	f12ba0c5	.config	log	report			info
ci-upstream-bpf-next-kasan-gce	2020/12/03 10:46	bpf-next	97306be4	e6b0d314	.config	log	report			info
ci-upstream-linux-next-kasan-gce-root	2020/10/08 05:24	linux-next	8b787da7	1880b4a9	.config	log	report			info