INFO: rcu_preempt detected stalls on CPUs/tasks:
(detected by 1, t=10502 jiffies, g=25810, c=25809, q=761)
All QSes seen, last rcu_preempt kthread activity 10502 (4295015060-4295004558), jiffies_till_next_fqs=1, root ->qsmask 0x0
syz-executor.3 R running task 26416 6441 6356 0x00000008
Call Trace:
sched_show_task kernel/sched/core.c:5168 [inline]
sched_show_task.cold+0x2e3/0x347 kernel/sched/core.c:5143
print_other_cpu_stall kernel/rcu/tree.c:1501 [inline]
check_cpu_stall kernel/rcu/tree.c:1616 [inline]
__rcu_pending kernel/rcu/tree.c:3390 [inline]
rcu_pending kernel/rcu/tree.c:3452 [inline]
rcu_check_callbacks.cold+0xd3f/0xdaa kernel/rcu/tree.c:2792
update_process_times+0x29/0x60 kernel/time/timer.c:1590
tick_sched_handle+0x7d/0x150 kernel/time/tick-sched.c:165
tick_sched_timer+0x3e/0x120 kernel/time/tick-sched.c:1223
__run_hrtimer kernel/time/hrtimer.c:1223 [inline]
__hrtimer_run_queues+0x25c/0xbb0 kernel/time/hrtimer.c:1287
hrtimer_interrupt+0x1e6/0x5e0 kernel/time/hrtimer.c:1321
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline]
smp_apic_timer_interrupt+0x117/0x5e0 arch/x86/kernel/apic/apic.c:1100
apic_timer_interrupt+0x8f/0xa0 arch/x86/entry/entry_64.S:792
RIP: 0010:dst_check include/net/dst.h:474 [inline]
RIP: 0010:sctp_transport_dst_check include/net/sctp/sctp.h:608 [inline]
RIP: 0010:sctp_packet_config+0x265/0x9f0 net/sctp/output.c:105
RSP: 0018:ffff8880aeb078e8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
RAX: ffffffff88749780 RBX: ffff8880a1625968 RCX: 1ffffffff10e92f2
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffffffff88749790
RBP: ffff8880a16256c0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88804af8c400
R13: 0000000000000001 R14: ffff88809b93f000 R15: ffff88804bf5b540
sctp_outq_flush+0x45e/0x2dd0 net/sctp/outqueue.c:879
sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1787 [inline]
sctp_side_effects net/sctp/sm_sideeffect.c:1179 [inline]
sctp_do_sm+0x419/0x4a90 net/sctp/sm_sideeffect.c:1150
sctp_generate_heartbeat_event+0x1da/0x3f0 net/sctp/sm_sideeffect.c:391
call_timer_fn+0x14a/0x650 kernel/time/timer.c:1279
expire_timers kernel/time/timer.c:1318 [inline]
__run_timers kernel/time/timer.c:1636 [inline]
__run_timers kernel/time/timer.c:1604 [inline]
run_timer_softirq+0x52a/0x1390 kernel/time/timer.c:1649
__do_softirq+0x254/0x9bf kernel/softirq.c:288
do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1015
do_softirq.part.0+0x103/0x160 kernel/softirq.c:332
do_softirq kernel/softirq.c:324 [inline]
__local_bh_enable_ip+0x149/0x190 kernel/softirq.c:185
local_bh_enable include/linux/bottom_half.h:32 [inline]
tun_rx_batched.isra.0+0x482/0x7a0 drivers/net/tun.c:1222
tun_get_user+0xcde/0x3880 drivers/net/tun.c:1581
tun_chr_write_iter+0xcf/0x179 drivers/net/tun.c:1608
call_write_iter include/linux/fs.h:1778 [inline]
new_sync_write fs/read_write.c:469 [inline]
__vfs_write+0x44e/0x630 fs/read_write.c:482
vfs_write+0x192/0x4e0 fs/read_write.c:544
SYSC_write fs/read_write.c:590 [inline]
SyS_write+0xf2/0x210 fs/read_write.c:582
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x416361
RSP: 002b:00007f6a3fe40c60 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000507740 RCX: 0000000000416361
RDX: 000000000000007e RSI: 0000000020000280 RDI: 00000000000000f0
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 00000000ffffffff
R13: 0000000000000bb2 R14: 00000000004cdd84 R15: 00007f6a3fe416d4
rcu_preempt kthread starved for 10502 jiffies! g25810 c25809 f0x2 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=1
rcu_preempt R running task 29536 8 2 0x80000000
Call Trace:
schedule+0x8d/0x1b0 kernel/sched/core.c:3428
schedule_timeout+0x43c/0xe40 kernel/time/timer.c:1746
rcu_gp_kthread+0xb8e/0x1ce0 kernel/rcu/tree.c:2255
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
INFO: rcu_sched self-detected stall on CPU
1-...: (1 GPs behind) idle=53e/140000000000001/0 softirq=91866/91868 fqs=0
INFO: rcu_sched detected stalls on CPUs/tasks:
(t=10541 jiffies g=14757 c=14756 q=2)
1-...: (1 GPs behind) idle=53e/140000000000001/0 softirq=91866/91868 fqs=0
rcu_sched kthread starved for 10541 jiffies! g14757 c14756 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0
rcu_sched R running task 29392 9 2 0x80000000
Call Trace:
schedule+0x8d/0x1b0 kernel/sched/core.c:3428
schedule_timeout+0x43c/0xe40 kernel/time/timer.c:1746
rcu_gp_kthread+0xb8e/0x1ce0 kernel/rcu/tree.c:2255
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404
(detected by 0, t=10541 jiffies, g=14757, c=14756, q=2)
NMI backtrace for cpu 1
CPU: 1 PID: 6441 Comm: syz-executor.3 Not tainted 4.14.177-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x13e/0x194 lib/dump_stack.c:58
nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101
nmi_trigger_cpumask_backtrace+0x139/0x17e lib/nmi_backtrace.c:62
trigger_single_cpu_backtrace include/linux/nmi.h:158 [inline]
rcu_dump_cpu_stacks+0x16d/0x1b8 kernel/rcu/tree.c:1396
print_cpu_stall kernel/rcu/tree.c:1542 [inline]
check_cpu_stall kernel/rcu/tree.c:1610 [inline]
__rcu_pending kernel/rcu/tree.c:3390 [inline]
rcu_pending kernel/rcu/tree.c:3452 [inline]
rcu_check_callbacks.cold+0x490/0xdaa kernel/rcu/tree.c:2792
update_process_times+0x29/0x60 kernel/time/timer.c:1590
tick_sched_handle+0x7d/0x150 kernel/time/tick-sched.c:165
tick_sched_timer+0x3e/0x120 kernel/time/tick-sched.c:1223
__run_hrtimer kernel/time/hrtimer.c:1223 [inline]
__hrtimer_run_queues+0x25c/0xbb0 kernel/time/hrtimer.c:1287
hrtimer_interrupt+0x1e6/0x5e0 kernel/time/hrtimer.c:1321
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1075 [inline]
smp_apic_timer_interrupt+0x117/0x5e0 arch/x86/kernel/apic/apic.c:1100
apic_timer_interrupt+0x8f/0xa0 arch/x86/entry/entry_64.S:792
RIP: 0010:dst_check include/net/dst.h:474 [inline]
RIP: 0010:sctp_transport_dst_check include/net/sctp/sctp.h:608 [inline]
RIP: 0010:sctp_packet_config+0x265/0x9f0 net/sctp/output.c:105
RSP: 0018:ffff8880aeb078e8 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff10
RAX: ffffffff88749780 RBX: ffff8880a1625968 RCX: 1ffffffff10e92f2
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffffffff88749790
RBP: ffff8880a16256c0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88804af8c400
R13: 0000000000000001 R14: ffff88809b93f000 R15: ffff88804bf5b540
sctp_outq_flush+0x45e/0x2dd0 net/sctp/outqueue.c:879
sctp_cmd_interpreter net/sctp/sm_sideeffect.c:1787 [inline]
sctp_side_effects net/sctp/sm_sideeffect.c:1179 [inline]
sctp_do_sm+0x419/0x4a90 net/sctp/sm_sideeffect.c:1150
sctp_generate_heartbeat_event+0x1da/0x3f0 net/sctp/sm_sideeffect.c:391
call_timer_fn+0x14a/0x650 kernel/time/timer.c:1279
expire_timers kernel/time/timer.c:1318 [inline]
__run_timers kernel/time/timer.c:1636 [inline]
__run_timers kernel/time/timer.c:1604 [inline]
run_timer_softirq+0x52a/0x1390 kernel/time/timer.c:1649
__do_softirq+0x254/0x9bf kernel/softirq.c:288
do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1015
do_softirq.part.0+0x103/0x160 kernel/softirq.c:332
do_softirq kernel/softirq.c:324 [inline]
__local_bh_enable_ip+0x149/0x190 kernel/softirq.c:185
local_bh_enable include/linux/bottom_half.h:32 [inline]
tun_rx_batched.isra.0+0x482/0x7a0 drivers/net/tun.c:1222
tun_get_user+0xcde/0x3880 drivers/net/tun.c:1581
tun_chr_write_iter+0xcf/0x179 drivers/net/tun.c:1608
call_write_iter include/linux/fs.h:1778 [inline]
new_sync_write fs/read_write.c:469 [inline]
__vfs_write+0x44e/0x630 fs/read_write.c:482
vfs_write+0x192/0x4e0 fs/read_write.c:544
SYSC_write fs/read_write.c:590 [inline]
SyS_write+0xf2/0x210 fs/read_write.c:582
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x416361
RSP: 002b:00007f6a3fe40c60 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 0000000000507740 RCX: 0000000000416361
RDX: 000000000000007e RSI: 0000000020000280 RDI: 00000000000000f0
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 00000000ffffffff
R13: 0000000000000bb2 R14: 00000000004cdd84 R15: 00007f6a3fe416d4
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at pc 0xffffffff8640b3ee
rcu_sched kthread starved for 10596 jiffies! g14757 c14756 f0x0 RCU_GP_WAIT_FQS(3) ->state=0x0 ->cpu=0
rcu_sched R running task 29392 9 2 0x80000000
Call Trace:
schedule+0x8d/0x1b0 kernel/sched/core.c:3428
schedule_timeout+0x43c/0xe40 kernel/time/timer.c:1746
rcu_gp_kthread+0xb8e/0x1ce0 kernel/rcu/tree.c:2255
kthread+0x30d/0x420 kernel/kthread.c:232
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404