netlink: 8 bytes leftover after parsing attributes in process `syz-executor2'. INFO: task syz-executor1:18812 blocked for more than 120 seconds. Not tainted 4.15.0-rc1-next-20171201+ #57 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor1 D25944 18812 3330 0x00000004 Call Trace: context_switch kernel/sched/core.c:2800 [inline] __schedule+0x8eb/0x2060 kernel/sched/core.c:3376 schedule+0xf5/0x430 kernel/sched/core.c:3435 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3493 __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 lo_ioctl+0x8b/0x1b90 drivers/block/loop.c:1355 __blkdev_driver_ioctl block/ioctl.c:303 [inline] blkdev_ioctl+0x1759/0x1e00 block/ioctl.c:601 block_ioctl+0xea/0x130 fs/block_dev.c:1860 vfs_ioctl fs/ioctl.c:46 [inline] do_vfs_ioctl+0x1b1/0x1530 fs/ioctl.c:686 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:692 entry_SYSCALL_64_fastpath+0x1f/0x96 RIP: 0033:0x4529d9 RSP: 002b:00007f7d39307c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000758300 RCX: 00000000004529d9 RDX: 0000000020872f68 RSI: 0000000000004c02 RDI: 0000000000000015 RBP: 00000000000002be R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f1270 R13: 00000000ffffffff R14: 00007f7d393086d4 R15: 0000000000000010 Showing all locks held in the system: 2 locks held by khungtaskd/676: #0: (rcu_read_lock){....}, at: [<00000000914b5199>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: (rcu_read_lock){....}, at: [<00000000914b5199>] watchdog+0x1c5/0xd60 kernel/hung_task.c:249 #1: (tasklist_lock){.+.+}, at: [<000000003ae1679e>] debug_show_all_locks+0xd3/0x400 kernel/locking/lockdep.c:4554 2 locks held by getty/3059: #0: (&tty->ldisc_sem){++++}, at: [<0000000058f3950b>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000004350b679>] n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 2 locks held by getty/3060: #0: (&tty->ldisc_sem){++++}, at: [<0000000058f3950b>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000004350b679>] n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 2 locks held by getty/3061: #0: (&tty->ldisc_sem){++++}, at: [<0000000058f3950b>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000004350b679>] n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 2 locks held by getty/3062: #0: (&tty->ldisc_sem){++++}, at: [<0000000058f3950b>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000004350b679>] n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 2 locks held by getty/3063: #0: (&tty->ldisc_sem){++++}, at: [<0000000058f3950b>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000004350b679>] n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 2 locks held by getty/3064: #0: (&tty->ldisc_sem){++++}, at: [<0000000058f3950b>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000004350b679>] n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 2 locks held by getty/3065: #0: (&tty->ldisc_sem){++++}, at: [<0000000058f3950b>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<000000004350b679>] n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 1 lock held by syz-executor1/18812: #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<000000007a3d097b>] lo_ioctl+0x8b/0x1b90 drivers/block/loop.c:1355 1 lock held by syz-executor1/18848: #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<000000007a3d097b>] lo_ioctl+0x8b/0x1b90 drivers/block/loop.c:1355 1 lock held by syz-executor6/18810: #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<000000007a3d097b>] lo_ioctl+0x8b/0x1b90 drivers/block/loop.c:1355 1 lock held by syz-executor6/18817: #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<000000007a3d097b>] lo_ioctl+0x8b/0x1b90 drivers/block/loop.c:1355 1 lock held by syz-executor6/18840: #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<000000007a3d097b>] lo_ioctl+0x8b/0x1b90 drivers/block/loop.c:1355 1 lock held by syz-executor6/18851: #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<000000007a3d097b>] lo_ioctl+0x8b/0x1b90 drivers/block/loop.c:1355 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 676 Comm: khungtaskd Not tainted 4.15.0-rc1-next-20171201+ #57 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+0x194/0x257 lib/dump_stack.c:53 nmi_cpu_backtrace+0x1d2/0x210 lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x122/0x180 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+0x37a/0x440 kernel/kthread.c:238 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:517 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.15.0-rc1-next-20171201+ #57 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: 00000000e9c7bfcf task.stack: 0000000026a5b18b RIP: 0010:accumulate_sum kernel/sched/fair.c:3138 [inline] RIP: 0010:___update_load_sum kernel/sched/fair.c:3233 [inline] RIP: 0010:__update_load_avg_cfs_rq kernel/sched/fair.c:3312 [inline] RIP: 0010:update_cfs_rq_load_avg kernel/sched/fair.c:3644 [inline] RIP: 0010:update_blocked_averages+0xec7/0x1b60 kernel/sched/fair.c:7323 RSP: 0018:ffff8801db4074c8 EFLAGS: 00000046 RAX: 0000000000108a6c RBX: ffff8801db4279c0 RCX: 0000000000000000 RDX: 0000000000000639 RSI: 0000000000000000 RDI: 00000000fa83b2da RBP: ffff8801db407818 R08: 0000000000000000 R09: ffff8801db427a3c R10: ffff8801db4074c8 R11: ffff8801db427a38 R12: dffffc0000000000 R13: 0000000000000000 R14: ffff8801db4077f0 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f4a5053f000 CR3: 00000001d08db000 CR4: 00000000001406f0 DR0: 0000000020001000 DR1: 0000000020001000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600 Call Trace: rebalance_domains+0x145/0xcc0 kernel/sched/fair.c:9078 run_rebalance_domains+0x381/0x780 kernel/sched/fair.c:9339 __do_softirq+0x29d/0xbb2 kernel/softirq.c:285 invoke_softirq kernel/softirq.c:365 [inline] irq_exit+0x1d3/0x210 kernel/softirq.c:405 scheduler_ipi+0x32a/0x830 kernel/sched/core.c:1804 smp_reschedule_interrupt+0xe6/0x670 arch/x86/kernel/smp.c:277 reschedule_interrupt+0xa9/0xb0 arch/x86/entry/entry_64.S:931 RIP: 0010:native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54 RSP: 0018:ffffffff85e07d08 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff02 RAX: dffffc0000000000 RBX: 1ffffffff0bc0fa4 RCX: 0000000000000000 RDX: 1ffffffff0bd9744 RSI: 0000000000000001 RDI: ffffffff85ecba20 RBP: ffffffff85e07d08 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 R13: ffffffff85e07dc0 R14: ffffffff865ec6a0 R15: 0000000000000000 arch_safe_halt arch/x86/include/asm/paravirt.h:93 [inline] default_idle+0xbf/0x430 arch/x86/kernel/process.c:355 arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:346 default_idle_call+0x36/0x90 kernel/sched/idle.c:98 cpuidle_idle_call kernel/sched/idle.c:156 [inline] do_idle+0x24a/0x3b0 kernel/sched/idle.c:246 cpu_startup_entry+0x18/0x20 kernel/sched/idle.c:351 rest_init+0xed/0xf0 init/main.c:436 start_kernel+0x729/0x74f init/main.c:718 x86_64_start_reservations+0x2a/0x2c arch/x86/kernel/head64.c:378 x86_64_start_kernel+0x77/0x7a arch/x86/kernel/head64.c:359 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:237 Code: ff ff 48 8b 95 c8 fc ff ff 4c 8b 8d c0 fc ff ff 4c 89 de 48 c1 ee 03 42 0f b6 34 26 40 84 f6 74 0a 40 80 fe 03 0f 8e f2 04 00 00 00 04 00 00 2b b5 f0 fc ff ff 81 e2 ff 03 00 00 89 43 78 4c