IPVS: stopping master sync thread 9674 ... INFO: task syz-executor2:14038 blocked for more than 120 seconds. Not tainted 4.9.107-gdb2c520 #49 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D25384 14038 3887 0x00000004 ffff8801d9bcb000 ffff8801c04c1a40 ffff8801c04c2a00 ffff8801d6a14800 ffff8801db221c18 ffff88018c257890 ffffffff839e8c1d 1ffff1003184af06 ffffffff855802f0 0000000041b58ab3 00ffffff843c2388 ffff8801db2224e8 Call Trace: [] schedule+0x7f/0x1b0 kernel/sched/core.c:3557 [] schedule_timeout+0x861/0xf70 kernel/time/timer.c:1768 [] io_schedule_timeout+0x1ba/0x390 kernel/sched/core.c:5180 [] io_schedule include/linux/sched.h:460 [inline] [] bit_wait_io+0x19/0xa0 kernel/sched/wait.c:582 [] __wait_on_bit_lock+0xce/0x1c0 kernel/sched/wait.c:421 [] __lock_page+0xff/0x160 mm/filemap.c:934 [] lock_page include/linux/pagemap.h:454 [inline] [] pagecache_get_page+0x409/0x720 mm/filemap.c:1216 [] find_lock_page include/linux/pagemap.h:284 [inline] [] truncate_inode_pages_range+0xca6/0x1290 mm/truncate.c:320 [] blkdev_fallocate+0x21d/0x440 fs/block_dev.c:1817 [] vfs_fallocate+0x359/0x600 fs/open.c:329 [] SYSC_fallocate fs/open.c:352 [inline] [] SyS_fallocate+0x53/0x90 fs/open.c:346 [] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Showing all locks held in the system: 2 locks held by khungtaskd/519: #0: (rcu_read_lock){......}, at: [] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline] #0: (rcu_read_lock){......}, at: [] watchdog+0x11c/0xa20 kernel/hung_task.c:239 #1: (tasklist_lock){.+.+..}, at: [] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336 1 lock held by rsyslogd/3680: #0: (&f->f_pos_lock){+.+.+.}, at: [] __fdget_pos+0xac/0xd0 fs/file.c:781 2 locks held by getty/3777: #0: (&tty->ldisc_sem){++++++}, at: [] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367 #1: (&ldata->atomic_read_lock){+.+...}, at: [] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133 1 lock held by syz-executor2/14038: #0: (sb_writers){.+.+.+}, at: [] sb_start_write include/linux/fs.h:1573 [inline] #0: (sb_writers){.+.+.+}, at: [] vfs_fallocate+0x2fb/0x600 fs/open.c:328 1 lock held by syz-executor2/14109: #0: (sb_writers){.+.+.+}, at: [] sb_start_write include/linux/fs.h:1573 [inline] #0: (sb_writers){.+.+.+}, at: [] vfs_fallocate+0x2fb/0x600 fs/open.c:328 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.107-gdb2c520 #49 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 ffff8801d861fd08 ffffffff81eb3da9 0000000000000000 0000000000000001 0000000000000001 0000000000000001 ffffffff810b96a0 ffff8801d861fd40 ffffffff81ebf0a7 0000000000000001 0000000000000000 0000000000000003 Call Trace: [] __dump_stack lib/dump_stack.c:15 [inline] [] dump_stack+0xc1/0x128 lib/dump_stack.c:51 [] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99 [] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60 [] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37 [] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline] [] check_hung_task kernel/hung_task.c:125 [inline] [] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline] [] watchdog+0x6b4/0xa20 kernel/hung_task.c:239 [] kthread+0x26d/0x300 kernel/kthread.c:211 [] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3680 Comm: rsyslogd Not tainted 4.9.107-gdb2c520 #49 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: ffff8801c38c1800 task.stack: ffff8801c2c20000 RIP: 0010:[] c [] atomic_cmpxchg arch/x86/include/asm/atomic.h:186 [inline] RIP: 0010:[] c [] queued_spin_lock include/asm-generic/qspinlock.h:100 [inline] RIP: 0010:[] c [] do_raw_spin_lock+0xbb/0x1b0 kernel/locking/spinlock_debug.c:113 RSP: 0018:ffff8801c2c27900 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffff8801db221c00 RCX: 0000000000000000 RDX: 0000000000000001 RSI: ffff8801c38c20c8 RDI: ffff8801db221c04 RBP: ffff8801c2c27920 R08: ffff8801c38c20e8 R09: 0000000000000001 R10: ffff8801c38c1800 R11: 0000000000000001 R12: ffff8801db221c08 R13: ffff8801db221c10 R14: 0000000000021c00 R15: ffff8801c38c1800 FS: 00007f8eda546700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f086e77d000 CR3: 00000001cb260000 CR4: 00000000001606f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Stack: ffff8801db221c00c 0000000000000001c ffff8801c38c1800c 0000000000021c00c ffff8801c2c27940c ffffffff839f8ebec ffffffff839e86ffc ffff8801db221c00c ffff8801c2c279c0c ffffffff839e86ffc ffff8801c38c20c0c ffff8801c38c1800c Call Trace: [] __raw_spin_lock include/linux/spinlock_api_smp.h:145 [inline] [] _raw_spin_lock+0x3e/0x50 kernel/locking/spinlock.c:151 [] __schedule+0x12f/0x1bd0 kernel/sched/core.c:3452 [] preempt_schedule_common+0x1f/0xd0 kernel/sched/core.c:3612 [] preempt_schedule+0x25/0x30 kernel/sched/core.c:3638 [] ___preempt_schedule+0x16/0x18 [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:163 [inline] [] _raw_spin_unlock_irqrestore+0x6b/0x70 kernel/locking/spinlock.c:191 [] try_to_wake_up+0xb7/0xec0 kernel/sched/core.c:2134 [] wake_up_process kernel/sched/core.c:2205 [inline] [] wake_up_q+0x9c/0xe0 kernel/sched/core.c:483 [] futex_wake_op kernel/futex.c:1588 [inline] [] do_futex+0x10d0/0x17c0 kernel/futex.c:3272 [] SYSC_futex kernel/futex.c:3322 [inline] [] SyS_futex+0x1fe/0x310 kernel/futex.c:3290 [] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282 [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb Code: c0f cb6 c04 c02 c84 cc0 c74 c08 c3c c03 c0f c8e cd1 c00 c00 c00 c65 c8b c05 ca1 c2d cdd c7e c39 c43 c08 c0f c84 c9e c00 c00 c00 c31 cc0 cba c01 c00 c00 c00 cf0 c0f cb1 c13 c<85> cc0 c0f c85 c9d c00 c00 c00 c48 cb8 c00 c00 c00 c00 c00 cfc cff cdf c4c c89 ce2 c