IPVS: sync thread started: state = BACKUP, mcast_ifn = sit0, syncid = 0, id = 0
IPVS: stopping backup sync thread 23193 ...
INFO: task syz-executor2:4482 blocked for more than 120 seconds.
Not tainted 4.16.0-rc7+ #3
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor2 D20000 4482 4476 0x00000000
Call Trace:
context_switch kernel/sched/core.c:2862 [inline]
__schedule+0x8fb/0x1ec0 kernel/sched/core.c:3440
schedule+0xf5/0x430 kernel/sched/core.c:3499
schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3557
__mutex_lock_common kernel/locking/mutex.c:833 [inline]
__mutex_lock+0xaad/0x1a80 kernel/locking/mutex.c:893
mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:908
rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74
cgrp_css_online+0x93/0x1b0 net/core/netprio_cgroup.c:161
online_css+0xf6/0x2e0 kernel/cgroup/cgroup.c:4679
css_create kernel/cgroup/cgroup.c:4750 [inline]
cgroup_apply_control_enable+0x710/0xbc0 kernel/cgroup/cgroup.c:2916
cgroup_mkdir+0x56f/0xfc0 kernel/cgroup/cgroup.c:4938
kernfs_iop_mkdir+0x153/0x1e0 fs/kernfs/dir.c:1099
vfs_mkdir+0x390/0x600 fs/namei.c:3800
SYSC_mkdirat fs/namei.c:3823 [inline]
SyS_mkdirat fs/namei.c:3807 [inline]
SYSC_mkdir fs/namei.c:3834 [inline]
SyS_mkdir+0x220/0x2a0 fs/namei.c:3832
do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287
entry_SYSCALL_64_after_hwframe+0x42/0xb7
RIP: 0033:0x453cd7
RSP: 002b:00007ffdc324a2a8 EFLAGS: 00000202 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 000000000000019f RCX: 0000000000453cd7
RDX: 0000000000000011 RSI: 00000000000001ff RDI: 00007ffdc324b020
RBP: 00007ffdc324a950 R08: 0000000000000000 R09: 0000000000000005
R10: 0000000000000064 R11: 0000000000000202 R12: 00007ffdc324a2d0
R13: 0000000000000013 R14: 0000000000000000 R15: 0000000000001380
Showing all locks held in the system:
2 locks held by khungtaskd/869:
#0: (rcu_read_lock){....}, at: [<00000000af0dc6b9>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline]
#0: (rcu_read_lock){....}, at: [<00000000af0dc6b9>] watchdog+0x1c5/0xd60 kernel/hung_task.c:249
#1: (tasklist_lock){.+.+}, at: [<00000000658f981f>] debug_show_all_locks+0xd3/0x3d0 kernel/locking/lockdep.c:4470
1 lock held by rsyslogd/4311:
#0: (&f->f_pos_lock){+.+.}, at: [<00000000a75102eb>] __fdget_pos+0x12b/0x190 fs/file.c:765
2 locks held by getty/4401:
#0: (&tty->ldisc_sem){++++}, at: [<00000000a8847aaf>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000006412dc90>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4402:
#0: (&tty->ldisc_sem){++++}, at: [<00000000a8847aaf>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000006412dc90>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4403:
#0: (&tty->ldisc_sem){++++}, at: [<00000000a8847aaf>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000006412dc90>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4404:
#0: (&tty->ldisc_sem){++++}, at: [<00000000a8847aaf>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000006412dc90>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4405:
#0: (&tty->ldisc_sem){++++}, at: [<00000000a8847aaf>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000006412dc90>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4406:
#0: (&tty->ldisc_sem){++++}, at: [<00000000a8847aaf>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000006412dc90>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
2 locks held by getty/4407:
#0: (&tty->ldisc_sem){++++}, at: [<00000000a8847aaf>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: (&ldata->atomic_read_lock){+.+.}, at: [<000000006412dc90>] n_tty_read+0x2ef/0x1a40 drivers/tty/n_tty.c:2131
4 locks held by syz-executor2/4482:
#0: (sb_writers#11){.+.+}, at: [<00000000c51596d8>] sb_start_write include/linux/fs.h:1548 [inline]
#0: (sb_writers#11){.+.+}, at: [<00000000c51596d8>] mnt_want_write+0x3f/0xb0 fs/namespace.c:386
#1: (&type->i_mutex_dir_key#4/1){+.+.}, at: [<000000005511bc33>] inode_lock_nested include/linux/fs.h:748 [inline]
#1: (&type->i_mutex_dir_key#4/1){+.+.}, at: [<000000005511bc33>] filename_create+0x192/0x520 fs/namei.c:3625
#2: (cgroup_mutex){+.+.}, at: [<000000002acbd4fa>] cgroup_kn_lock_live+0x29e/0x580 kernel/cgroup/cgroup.c:1535
#3: (rtnl_mutex){+.+.}, at: [<000000000fa69480>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74
3 locks held by kworker/1:2/5133:
#0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<0000000080576f9e>] work_static include/linux/workqueue.h:198 [inline]
#0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<0000000080576f9e>] set_work_data kernel/workqueue.c:619 [inline]
#0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<0000000080576f9e>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline]
#0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<0000000080576f9e>] process_one_work+0xb12/0x1bb0 kernel/workqueue.c:2084
#1: ((work_completion)(&css->destroy_work)){+.+.}, at: [<00000000a2cc8008>] process_one_work+0xb89/0x1bb0 kernel/workqueue.c:2088
#2: (cgroup_mutex){+.+.}, at: [<00000000726890e6>] css_killed_work_fn+0x93/0x5c0 kernel/cgroup/cgroup.c:4967
3 locks held by kworker/0:10/13236:
#0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<0000000080576f9e>] work_static include/linux/workqueue.h:198 [inline]
#0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<0000000080576f9e>] set_work_data kernel/workqueue.c:619 [inline]
#0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<0000000080576f9e>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline]
#0: ((wq_completion)"%s"("ipv6_addrconf")){+.+.}, at: [<0000000080576f9e>] process_one_work+0xb12/0x1bb0 kernel/workqueue.c:2084
#1: ((addr_chk_work).work){+.+.}, at: [<00000000a2cc8008>] process_one_work+0xb89/0x1bb0 kernel/workqueue.c:2088
#2: (rtnl_mutex){+.+.}, at: [<000000000fa69480>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74
3 locks held by kworker/0:12/13238:
#0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<0000000080576f9e>] work_static include/linux/workqueue.h:198 [inline]
#0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<0000000080576f9e>] set_work_data kernel/workqueue.c:619 [inline]
#0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<0000000080576f9e>] set_work_pool_and_clear_pending kernel/workqueue.c:646 [inline]
#0: ((wq_completion)"cgroup_destroy"){+.+.}, at: [<0000000080576f9e>] process_one_work+0xb12/0x1bb0 kernel/workqueue.c:2084
#1: ((work_completion)(&css->destroy_work)){+.+.}, at: [<00000000a2cc8008>] process_one_work+0xb89/0x1bb0 kernel/workqueue.c:2088
#2: (cgroup_mutex){+.+.}, at: [<00000000726890e6>] css_killed_work_fn+0x93/0x5c0 kernel/cgroup/cgroup.c:4967
1 lock held by syz-executor1/23194:
#0: (ipvs->sync_mutex){+.+.}, at: [<0000000064f692d3>] do_ip_vs_set_ctl+0x277/0x1cc0 net/netfilter/ipvs/ip_vs_ctl.c:2393
2 locks held by syz-executor1/23195:
#0: (rtnl_mutex){+.+.}, at: [<000000000fa69480>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74
#1: (ipvs->sync_mutex){+.+.}, at: [<00000000193d0857>] do_ip_vs_set_ctl+0x10f8/0x1cc0 net/netfilter/ipvs/ip_vs_ctl.c:2388
1 lock held by ipvs-b:13:0/23193:
#0: (rtnl_mutex){+.+.}, at: [<000000000fa69480>] rtnl_lock+0x17/0x20 net/core/rtnetlink.c:74
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 869 Comm: khungtaskd Not tainted 4.16.0-rc7+ #3
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+0x194/0x24d lib/dump_stack.c:53
nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103
nmi_trigger_cpumask_backtrace+0x123/0x180 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:138 [inline]
check_hung_task kernel/hung_task.c:132 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:190 [inline]
watchdog+0x90c/0xd60 kernel/hung_task.c:249
kthread+0x33c/0x400 kernel/kthread.c:238
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:406
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54