IPVS: sync thread started: state = MASTER, mcast_ifn = syz_tun, syncid = 0, id = 0
IPVS: stopping master sync thread 8272 ...
IPVS: stopping master sync thread 8275 ...
IPVS: sync thread started: state = MASTER, mcast_ifn = syz_tun, syncid = 0, id = 0
INFO: task syz-executor7:8281 blocked for more than 140 seconds.
Not tainted 4.18.0-rc7+ #174
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor7 D24216 8281 4424 0x00000004
Call Trace:
context_switch kernel/sched/core.c:2853 [inline]
__schedule+0x87c/0x1ec0 kernel/sched/core.c:3501
schedule+0xfb/0x450 kernel/sched/core.c:3545
__rwsem_down_write_failed_common+0x95d/0x1630 kernel/locking/rwsem-xadd.c:566
rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:595
call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117
__down_write arch/x86/include/asm/rwsem.h:142 [inline]
down_write+0xaa/0x130 kernel/locking/rwsem.c:72
inode_lock include/linux/fs.h:715 [inline]
chown_common+0x3a9/0x730 fs/open.c:640
do_fchownat+0x16e/0x250 fs/open.c:673
__do_sys_lchown fs/open.c:698 [inline]
__se_sys_lchown fs/open.c:696 [inline]
__x64_sys_lchown+0x7e/0xc0 fs/open.c:696
do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x456b29
Code: 42 08 84 00 48 83 c0 58 48 89 04 24 e8 00 8b fb ff 48 8b 6c 24 08 48 83 c4 10 c3 e8 91 33 00 00 eb bf cc cc cc cc cc cc cc cc <cc> cc cc cc cc cc cc 64 48 8b 0c 25 f8 ff ff ff 48 3b 61 10 76 2b
RSP: 002b:00007f32cb71cc78 EFLAGS: 00000246 ORIG_RAX: 000000000000005e
RAX: ffffffffffffffda RBX: 00007f32cb71d6d4 RCX: 0000000000456b29
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000080
RBP: 0000000000930280 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004d1898 R14: 00000000004c71dc R15: 0000000000000003
Showing all locks held in the system:
1 lock held by khungtaskd/774:
#0: 00000000e15ff7a4 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x428 kernel/locking/lockdep.c:4461
1 lock held by rsyslogd/4286:
2 locks held by getty/4377:
#0: 00000000df24f2d3 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: 00000000378d9e46 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/4378:
#0: 00000000d88dac9e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: 000000004ce7a5e6 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/4379:
#0: 000000008e0f8500 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: 0000000025ac6766 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/4380:
#0: 00000000990e988f (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: 000000009ca48ccf (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/4381:
#0: 000000005bba8e0d (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: 000000000a7cb7bf (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by getty/4382:
#0: 00000000e1ff4342 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: 0000000040a60b30 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
2 locks held by syz-executor7/8196:
#0: 00000000ce3664cd (sb_writers#18){.+.+}, at: sb_start_write include/linux/fs.h:1554 [inline]
#0: 00000000ce3664cd (sb_writers#18){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386
#1: 000000000d007b31 (&sb->s_type->i_mutex_key#20){+.+.}, at: inode_lock include/linux/fs.h:715 [inline]
#1: 000000000d007b31 (&sb->s_type->i_mutex_key#20){+.+.}, at: chown_common+0x3a9/0x730 fs/open.c:640
2 locks held by syz-executor7/8281:
#0: 00000000ce3664cd (sb_writers#18){.+.+}, at: sb_start_write include/linux/fs.h:1554 [inline]
#0: 00000000ce3664cd (sb_writers#18){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386
#1: 000000000d007b31 (&sb->s_type->i_mutex_key#20){+.+.}, at: inode_lock include/linux/fs.h:715 [inline]
#1: 000000000d007b31 (&sb->s_type->i_mutex_key#20){+.+.}, at: chown_common+0x3a9/0x730 fs/open.c:640
2 locks held by getty/8291:
#0: 0000000089a2a6e4 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365
#1: 00000000bad30148 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 774 Comm: khungtaskd Not tainted 4.18.0-rc7+ #174
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+0x1c9/0x2b4 lib/dump_stack.c:113
nmi_cpu_backtrace.cold.4+0x19/0xce lib/nmi_backtrace.c:103
nmi_trigger_cpumask_backtrace+0x151/0x192 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_uninterruptible_tasks kernel/hung_task.c:196 [inline]
watchdog+0x9c4/0xf80 kernel/hung_task.c:252
kthread+0x345/0x410 kernel/kthread.c:246
ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412
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