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Date: Tue, 28 Jul 2020 22:53:22 -0700
From: syzbot <syzbot+9f78d5c664a8c33f4cce@...kaller.appspotmail.com>
To: davem@...emloft.net, fweisbec@...il.com, jhs@...atatu.com,
jiri@...nulli.us, linux-kernel@...r.kernel.org, mingo@...nel.org,
netdev@...r.kernel.org, syzkaller-bugs@...glegroups.com,
tglx@...utronix.de, vinicius.gomes@...el.com,
xiyou.wangcong@...il.com
Subject: INFO: rcu detected stall in tc_modify_qdisc
Hello,
syzbot found the following issue on:
HEAD commit: 181964e6 fix a braino in cmsghdr_from_user_compat_to_kern()
git tree: net
console output: https://syzkaller.appspot.com/x/log.txt?x=12925e38900000
kernel config: https://syzkaller.appspot.com/x/.config?x=f87a5e4232fdb267
dashboard link: https://syzkaller.appspot.com/bug?extid=9f78d5c664a8c33f4cce
compiler: gcc (GCC) 10.1.0-syz 20200507
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16587f8c900000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15b2d790900000
The issue was bisected to:
commit 5a781ccbd19e4664babcbe4b4ead7aa2b9283d22
Author: Vinicius Costa Gomes <vinicius.gomes@...el.com>
Date: Sat Sep 29 00:59:43 2018 +0000
tc: Add support for configuring the taprio scheduler
bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=160e1bac900000
console output: https://syzkaller.appspot.com/x/log.txt?x=110e1bac900000
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+9f78d5c664a8c33f4cce@...kaller.appspotmail.com
Fixes: 5a781ccbd19e ("tc: Add support for configuring the taprio scheduler")
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 1-...!: (1 GPs behind) idle=6f6/1/0x4000000000000000 softirq=10195/10196 fqs=1
(t=27930 jiffies g=9233 q=413)
rcu: rcu_preempt kthread starved for 27901 jiffies! g9233 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
rcu_preempt R running task 29112 10 2 0x00004000
Call Trace:
context_switch kernel/sched/core.c:3458 [inline]
__schedule+0x8ea/0x2210 kernel/sched/core.c:4219
schedule+0xd0/0x2a0 kernel/sched/core.c:4294
schedule_timeout+0x148/0x250 kernel/time/timer.c:1908
rcu_gp_fqs_loop kernel/rcu/tree.c:1874 [inline]
rcu_gp_kthread+0xae5/0x1b50 kernel/rcu/tree.c:2044
kthread+0x3b5/0x4a0 kernel/kthread.c:291
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
NMI backtrace for cpu 1
CPU: 1 PID: 6799 Comm: syz-executor494 Not tainted 5.8.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
<IRQ>
__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_single_cpu_backtrace include/linux/nmi.h:164 [inline]
rcu_dump_cpu_stacks+0x194/0x1cf kernel/rcu/tree_stall.h:320
print_cpu_stall kernel/rcu/tree_stall.h:553 [inline]
check_cpu_stall kernel/rcu/tree_stall.h:627 [inline]
rcu_pending kernel/rcu/tree.c:3489 [inline]
rcu_sched_clock_irq.cold+0x5b3/0xccc kernel/rcu/tree.c:2504
update_process_times+0x25/0x60 kernel/time/timer.c:1737
tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:176
tick_sched_timer+0x108/0x290 kernel/time/tick-sched.c:1320
__run_hrtimer kernel/time/hrtimer.c:1520 [inline]
__hrtimer_run_queues+0x1d5/0xfc0 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:arch_local_irq_restore arch/x86/include/asm/paravirt.h:770 [inline]
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x8c/0xe0 kernel/locking/spinlock.c:191
Code: 48 c7 c0 88 e0 b4 89 48 ba 00 00 00 00 00 fc ff df 48 c1 e8 03 80 3c 10 00 75 37 48 83 3d e3 52 cc 01 00 74 22 48 89 df 57 9d <0f> 1f 44 00 00 bf 01 00 00 00 e8 35 e5 66 f9 65 8b 05 fe 70 19 78
RSP: 0018:ffffc900016672c0 EFLAGS: 00000282
RAX: 1ffffffff1369c11 RBX: 0000000000000282 RCX: 0000000000000002
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: 0000000000000282
RBP: ffff888093a052e8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000282
R13: 00000078100c35c3 R14: ffff888093a05000 R15: 0000000000000000
spin_unlock_irqrestore include/linux/spinlock.h:408 [inline]
taprio_change+0x1fdc/0x2960 net/sched/sch_taprio.c:1557
taprio_init+0x52e/0x670 net/sched/sch_taprio.c:1670
qdisc_create+0x4b6/0x12e0 net/sched/sch_api.c:1246
tc_modify_qdisc+0x4c8/0x1990 net/sched/sch_api.c:1662
rtnetlink_rcv_msg+0x44e/0xad0 net/core/rtnetlink.c:5461
netlink_rcv_skb+0x15a/0x430 net/netlink/af_netlink.c:2469
netlink_unicast_kernel net/netlink/af_netlink.c:1303 [inline]
netlink_unicast+0x533/0x7d0 net/netlink/af_netlink.c:1329
netlink_sendmsg+0x856/0xd90 net/netlink/af_netlink.c:1918
sock_sendmsg_nosec net/socket.c:652 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:672
____sys_sendmsg+0x6e8/0x810 net/socket.c:2352
___sys_sendmsg+0xf3/0x170 net/socket.c:2406
__sys_sendmsg+0xe5/0x1b0 net/socket.c:2439
do_syscall_64+0x60/0xe0 arch/x86/entry/common.c:384
entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x443819
Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 0f 83 fb 0f fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff687c83d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000443819
RDX: 0000000000000000 RSI: 00000000200007c0 RDI: 0000000000000004
RBP: 00007fff687c83e0 R08: 0000000001bbbbbb R09: 0000000001bbbbbb
R10: 0000000001bbbbbb R11: 0000000000000246 R12: 00007fff687c83f0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.
syzbot will keep track of this issue. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this issue, for details see:
https://goo.gl/tpsmEJ#testing-patches
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