INFO: rcu detected stall in batadv_nc

INFO: rcu detected stall in batadv_nc_worker (3)
Status: upstream: reported on 2020/10/01 10:35
Reported-by: syzbot+69904c3b4a09e8fa2e1b@syzkaller.appspotmail.com
First crash: 627d, last: 19d

similar bugs (2):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	INFO: rcu detected stall in batadv_nc_worker				7	785d	787d	0/22	closed as invalid on 2019/12/04 14:04
upstream	INFO: rcu detected stall in batadv_nc_worker (2)				4	750d	750d	0/22	closed as invalid on 2020/01/09 08:13

Sample crash report:

rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P2971/1:b..l P29980/1:b..l
	(detected by 1, t=10502 jiffies, g=228221, q=159)
task:kworker/u4:16   state:R  running task     stack:23600 pid:29980 ppid:     2 flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4972 [inline]
 __schedule+0xb72/0x1460 kernel/sched/core.c:6253
 preempt_schedule_irq+0xf7/0x1c0 kernel/sched/core.c:6668
 irqentry_exit+0x56/0x90 kernel/entry/common.c:425
 asm_sysvec_apic_timer_interrupt+0x12/0x20
RIP: 0010:rcu_lock_acquire+0xa/0x30 include/linux/rcupdate.h:268
Code: 72 ff ff ff 48 89 df e8 a4 5f e6 f7 e9 65 ff ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 e8 db f0 9b f7 e8 d6 f0 9b f7 <48> c7 c7 00 de b1 8c 31 f6 31 d2 b9 02 00 00 00 45 31 c0 45 31 c9
RSP: 0018:ffffc90004307b88 EFLAGS: 00000293
RAX: ffffffff89e88d3a RBX: ffff8880228d6880 RCX: ffff888058ca1d00
RDX: 0000000000000000 RSI: 0000000000000080 RDI: ffffffff8cb1de00
RBP: 0000000000000000 R08: ffffffff89e882b4 R09: fffffbfff1ff3df8
R10: fffffbfff1ff3df8 R11: 0000000000000000 R12: ffff8880228d6890
R13: ffff88805cad8c80 R14: ffff8880791b8000 R15: ffffffff89e885b0
 rcu_read_lock include/linux/rcupdate.h:688 [inline]
 batadv_nc_process_nc_paths+0xc6/0x360 net/batman-adv/network-coding.c:691
 batadv_nc_worker+0x3de/0x5b0 net/batman-adv/network-coding.c:732
 process_one_work+0x853/0x1140 kernel/workqueue.c:2298
 worker_thread+0xac1/0x1320 kernel/workqueue.c:2445
 kthread+0x468/0x490 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30
 </TASK>
task:udevd           state:R  running task     stack:22192 pid: 2971 ppid:     1 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4972 [inline]
 __schedule+0xb72/0x1460 kernel/sched/core.c:6253
 preempt_schedule_common kernel/sched/core.c:6419 [inline]
 preempt_schedule+0x14d/0x190 kernel/sched/core.c:6444
 preempt_schedule_thunk+0x16/0x18
 __raw_spin_unlock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_unlock+0x36/0x40 kernel/locking/spinlock.c:186
 spin_unlock include/linux/spinlock.h:389 [inline]
 lockref_put_or_lock+0x6f/0xb0 lib/lockref.c:178
 fast_dput fs/dcache.c:750 [inline]
 dput+0x2f5/0x6e0 fs/dcache.c:875
 __fput+0x5ed/0x870 fs/file_table.c:293
 task_work_run+0x146/0x1c0 kernel/task_work.c:164
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:175 [inline]
 exit_to_user_mode_prepare+0x209/0x220 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:300
 do_syscall_64+0x53/0xd0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f037e447fc3
RSP: 002b:00007fff2777f998 EFLAGS: 00000246 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f037e447fc3
RDX: 0000000000000000 RSI: 000000000000125f RDI: 000000000000000c
RBP: 000055ee69700a80 R08: 0000000000000008 R09: 000055ee69717a60
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff2777fb88
R13: 000000000000000c R14: 0000000000000000 R15: 0000000000000000
 </TASK>
rcu: rcu_preempt kthread timer wakeup didn't happen for 10501 jiffies! g228221 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402
rcu: 	Possible timer handling issue on cpu=0 timer-softirq=129037
rcu: rcu_preempt kthread starved for 10502 jiffies! g228221 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:I stack:26576 pid:   14 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4972 [inline]
 __schedule+0xb72/0x1460 kernel/sched/core.c:6253
 schedule+0x12b/0x1f0 kernel/sched/core.c:6326
 schedule_timeout+0x1b9/0x300 kernel/time/timer.c:1881
 rcu_gp_fqs_loop+0x1fd/0x770 kernel/rcu/tree.c:1955
 rcu_gp_kthread+0xa5/0x350 kernel/rcu/tree.c:2128
 kthread+0x468/0x490 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 19332 Comm: syz-executor.2 Not tainted 5.16.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:lock_is_held_type+0x127/0x190 kernel/locking/lockdep.c:5682
Code: 48 c7 c7 40 18 6f 8a e8 e7 10 00 00 b8 ff ff ff ff 65 0f c1 05 ea 1c f8 75 83 f8 01 75 40 48 c7 04 24 00 00 00 00 9c 8f 04 24 <f7> 04 24 00 02 00 00 75 46 41 f7 c4 00 02 00 00 74 01 fb 65 48 8b
RSP: 0018:ffffc90000007c18 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000080010003
RDX: ffff88807d6cba00 RSI: 0000000000010003 RDI: 0000000000000000
RBP: 0000000000000001 R08: ffffffff8173bb35 R09: fffffbfff1bfd566
R10: fffffbfff1bfd566 R11: 0000000000000000 R12: 0000000000000046
R13: ffff88807d6cba00 R14: 00000000ffffffff R15: ffffffff8cb1dd60
FS:  00007fe684fe2700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000040 CR3: 0000000024a19000 CR4: 00000000003506f0
Call Trace:
 <IRQ>
 lock_is_held include/linux/lockdep.h:283 [inline]
 rcu_read_lock_sched_held+0x89/0x130 kernel/rcu/update.c:125
 trace_hrtimer_cancel+0xab/0x260 include/trace/events/timer.h:290
 debug_deactivate kernel/time/hrtimer.c:482 [inline]
 __run_hrtimer kernel/time/hrtimer.c:1653 [inline]
 __hrtimer_run_queues+0x301/0xa60 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3b3/0x1040 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0xf9/0x270 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0xd4/0x130 kernel/locking/spinlock.c:194
Code: 9c 8f 44 24 20 42 80 3c 23 00 74 08 4c 89 f7 e8 02 d9 c1 f7 f6 44 24 21 02 75 4e 41 f7 c7 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> 87 12 4d f7 65 8b 05 d8 5b f5 75 85 c0 74 3f 48 c7 04 24 0e 36
RSP: 0018:ffffc900045afca0 EFLAGS: 00000206
RAX: 8fb0b90288256300 RBX: 1ffff920008b5f98 RCX: ffffffff90bb6903
RDX: dffffc0000000000 RSI: 0000000000000001 RDI: 0000000000000001
RBP: ffffc900045afd30 R08: ffffffff818b1ab0 R09: fffffbfff1966079
R10: fffffbfff1966079 R11: 0000000000000000 R12: dffffc0000000000
R13: 1ffff920008b5f94 R14: ffffc900045afcc0 R15: 0000000000000246
 do_settimeofday64+0x68b/0x810 kernel/time/timekeeping.c:1323
 __do_sys_clock_settime kernel/time/posix-timers.c:1079 [inline]
 __se_sys_clock_settime kernel/time/posix-timers.c:1067 [inline]
 __x64_sys_clock_settime+0x23d/0x280 kernel/time/posix-timers.c:1067
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fe68666ce99
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe684fe2168 EFLAGS: 00000246 ORIG_RAX: 00000000000000e3
RAX: ffffffffffffffda RBX: 00007fe68677ff60 RCX: 00007fe68666ce99
RDX: 0000000000000000 RSI: 0000000020000000 RDI: 0000000000000000
RBP: 00007fe6866c6ff1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff13bf2c3f R14: 00007fe684fe2300 R15: 0000000000022000
 </TASK>
----------------
Code disassembly (best guess), 3 bytes skipped:
   0:	ff 48 89             	decl   -0x77(%rax)
   3:	df e8                	fucomip %st(0),%st
   5:	a4                   	movsb  %ds:(%rsi),%es:(%rdi)
   6:	5f                   	pop    %rdi
   7:	e6 f7                	out    %al,$0xf7
   9:	e9 65 ff ff ff       	jmpq   0xffffff73
   e:	66 2e 0f 1f 84 00 00 	nopw   %cs:0x0(%rax,%rax,1)
  15:	00 00 00
  18:	0f 1f 44 00 00       	nopl   0x0(%rax,%rax,1)
  1d:	e8 db f0 9b f7       	callq  0xf79bf0fd
  22:	e8 d6 f0 9b f7       	callq  0xf79bf0fd
* 27:	48 c7 c7 00 de b1 8c 	mov    $0xffffffff8cb1de00,%rdi <-- trapping instruction
  2e:	31 f6                	xor    %esi,%esi
  30:	31 d2                	xor    %edx,%edx
  32:	b9 02 00 00 00       	mov    $0x2,%ecx
  37:	45 31 c0             	xor    %r8d,%r8d
  3a:	45 31 c9             	xor    %r9d,%r9d

Crashes (62):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report	VM info	Title
ci-upstream-kasan-gce-smack-root	2021/12/28 17:31	upstream	a8ad9a2434dc	76c8cf06	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-selinux-root	2021/12/23 10:40	upstream	bc491fb12513	6caa12e4	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-smack-root	2021/12/22 20:37	upstream	3f066e882bf1	6caa12e4	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-smack-root	2021/12/15 19:05	upstream	5472f14a3742	572bcb40	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-smack-root	2021/12/10 21:13	upstream	b8a98b6bf66a	49ca1f59	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-selinux-root	2021/12/09 14:52	upstream	2a987e65025e	b54aa474	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-smack-root	2021/12/01 12:01	upstream	58e1100fdc59	5fa3eacc	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-smack-root	2021/12/01 10:21	upstream	58e1100fdc59	5fa3eacc	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-root	2021/12/01 05:56	upstream	f080815fdb3e	80270552	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-root	2021/11/28 22:46	upstream	d06c942efea4	63eeac02	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-root	2021/11/28 17:01	upstream	3498e7f2bb41	63eeac02	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-root	2021/11/25 22:27	upstream	b501b85957de	63eeac02	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-root	2021/11/22 11:41	upstream	136057256686	4eb20a4e	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-smack-root	2021/10/28 12:41	upstream	1fc596a56b33	be531bb4	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-smack-root	2021/10/27 07:18	upstream	d25f27432f80	d50eb50a	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-selinux-root	2021/10/22 20:01	upstream	64222515138e	282f03fb	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-root	2021/10/22 03:08	upstream	2f111a6fd5b5	55f90bc6	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-root	2021/10/21 00:52	upstream	8e37395c3a5d	f111d03b	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-selinux-root	2021/10/18 09:16	upstream	cf52ad5ff16c	0c5d9412	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-selinux-root	2021/10/16 21:46	upstream	304040fb4909	0c5d9412	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-root	2021/10/15 12:08	upstream	ec681c53f8d2	0c5d9412	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-selinux-root	2021/10/14 17:11	upstream	26d657410983	5462d470	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-smack-root	2021/10/13 22:47	upstream	348949d9a444	5462d470	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-smack-root	2021/10/13 20:43	upstream	348949d9a444	5462d470	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-smack-root	2021/10/10 00:52	upstream	7fd2bf83d59a	838e7e2c	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-selinux-root	2021/10/08 21:06	upstream	741668ef7832	efe0f24d	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-selinux-root	2021/10/07 02:45	upstream	5af4055fa813	62ee0987	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-selinux-root	2021/10/05 04:48	upstream	84b3e42564ac	ce697b49	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-selinux-root	2021/10/04 07:58	upstream	9e1ff307c779	ce697b49	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-smack-root	2021/10/04 00:36	upstream	9e1ff307c779	db0f5787	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-root	2021/09/26 01:59	upstream	a5e0aceabef6	8cac236e	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-selinux-root	2021/09/24 19:30	upstream	4c4f0c2bf341	8cac236e	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-smack-root	2021/09/17 12:25	upstream	bdb575f87217	5b989942	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-smack-root	2021/08/19 17:52	upstream	d6d09a694205	b599f2fc	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-root	2021/08/12 12:04	upstream	1746f4db5135	6972b106	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-smack-root	2021/06/20 08:30	upstream	913ec3c22ef4	aba2b2fb	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-root	2021/05/12 21:56	upstream	dbb5afad100a	da958a4d	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-bpf-kasan-gce	2021/06/29 17:22	bpf	d6765985a42a	9d2ab5df	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-net-kasan-gce	2022/01/09 00:20	net-next	82192cb497f9	2ca0d385	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-bpf-next-kasan-gce	2021/09/20 23:34	bpf-next	e57f52b42d1f	af796c18	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-bpf-next-kasan-gce	2021/08/31 16:32	bpf-next	a16ef91aa61a	8f58a0ef	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-bpf-next-kasan-gce	2021/08/24 22:50	bpf-next	a6258837c8a8	b599f2fc	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-bpf-next-kasan-gce	2021/08/12 07:29	bpf-next	25dc3895baaa	6972b106	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-bpf-next-kasan-gce	2021/06/09 00:28	bpf-next	380afe720896	5c2fe346	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-bpf-next-kasan-gce	2021/05/25 13:44	bpf-next	8fb33b605530	3c7fef33	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-linux-next-kasan-gce-root	2021/09/14 17:33	linux-next	815c5020b5ab	07e953c1	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-linux-next-kasan-gce-root	2021/09/13 03:28	linux-next	24a36d3171e4	5ae8508a	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-linux-next-kasan-gce-root	2021/08/29 12:22	linux-next	5e63226c7228	be2c130d	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-linux-next-kasan-gce-root	2021/08/28 12:27	linux-next	5e63226c7228	be2c130d	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-linux-next-kasan-gce-root	2021/04/07 15:24	linux-next	5103a5be098c	6a81331a	.config	log	report	info	INFO: rcu detected stall in batadv_nc_worker
ci-upstream-kasan-gce-root	2020/12/31 16:10	upstream	f6e1ea196492	79264ae3	.config	log	report	info
ci-upstream-kasan-gce-root	2020/10/09 00:16	upstream	3d006ee42dde	92390980	.config	log	report	info
ci-upstream-kasan-gce-smack-root	2020/08/06 00:31	upstream	fffe3ae0ee84	0487ea6f	.config	log	report
ci-upstream-kasan-gce-root	2020/07/08 03:46	upstream	7cc2a8ea1048	51095195	.config	log	report
ci-upstream-kasan-gce-smack-root	2020/07/07 14:37	upstream	7cc2a8ea1048	51095195	.config	log	report
ci-upstream-kasan-gce-selinux-root	2020/05/30 22:53	upstream	ffeb595d8481	6f3e1c7c	.config	log	report
ci-upstream-kasan-gce-root	2020/05/10 07:00	upstream	1d3962ae3b3d	8742a2b9	.config	log	report
ci-upstream-kasan-gce-386	2020/07/13 03:50	upstream	4437dd6e8f71	9ebcc5b1	.config	log	report
ci-upstream-net-this-kasan-gce	2020/07/22 15:39	net	2c4dc3148603	128cd85f	.config	log	report
ci-upstream-net-this-kasan-gce	2020/07/03 01:55	net	e4b9a72d76a4	bed10395	.config	log	report
ci-upstream-net-kasan-gce	2020/09/01 04:44	net-next	c30a3c957c88	d5a3ae1f	.config	log	report
ci-upstream-linux-next-kasan-gce-root	2020/09/02 03:53	linux-next	b36c969764ab	abf9ba4f	.config	log	report