netlink: 5 bytes leftover after parsing attributes in process `syz-executor1'. INFO: task syz-executor0:11636 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-executor0 D25616 11636 3341 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 do_syscall_64+0x26c/0x920 arch/x86/entry/common.c:285 entry_SYSCALL64_slow_path+0x25/0x25 RIP: 0033:0x4529d9 RSP: 002b:00007f6cc6038c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000758190 RCX: 00000000004529d9 RDX: 000000002004ef20 RSI: 0000000000004c05 RDI: 0000000000000017 RBP: 000000000000024f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000212 R12: 00000000006f0808 R13: 00000000ffffffff R14: 00007f6cc60396d4 R15: 0000000000000002 Showing all locks held in the system: 2 locks held by khungtaskd/676: #0: (rcu_read_lock){....}, at: [<00000000aac0547b>] check_hung_uninterruptible_tasks kernel/hung_task.c:175 [inline] #0: (rcu_read_lock){....}, at: [<00000000aac0547b>] watchdog+0x1c5/0xd60 kernel/hung_task.c:249 #1: (tasklist_lock){.+.+}, at: [<00000000cbe379a2>] debug_show_all_locks+0xd3/0x400 kernel/locking/lockdep.c:4554 1 lock held by rsyslogd/2976: #0: (&f->f_pos_lock){+.+.}, at: [<00000000eb4610e7>] __fdget_pos+0x131/0x1a0 fs/file.c:770 2 locks held by getty/3058: #0: (&tty->ldisc_sem){++++}, at: [<0000000007db15c2>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000a66f968c>] n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 2 locks held by getty/3059: #0: (&tty->ldisc_sem){++++}, at: [<0000000007db15c2>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000a66f968c>] n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 2 locks held by getty/3060: #0: (&tty->ldisc_sem){++++}, at: [<0000000007db15c2>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000a66f968c>] n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 2 locks held by getty/3061: #0: (&tty->ldisc_sem){++++}, at: [<0000000007db15c2>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000a66f968c>] n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 2 locks held by getty/3062: #0: (&tty->ldisc_sem){++++}, at: [<0000000007db15c2>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000a66f968c>] n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 2 locks held by getty/3063: #0: (&tty->ldisc_sem){++++}, at: [<0000000007db15c2>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000a66f968c>] n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 2 locks held by getty/3064: #0: (&tty->ldisc_sem){++++}, at: [<0000000007db15c2>] ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: (&ldata->atomic_read_lock){+.+.}, at: [<00000000a66f968c>] n_tty_read+0x2f2/0x1a10 drivers/tty/n_tty.c:2131 1 lock held by syz-executor0/11636: #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<000000009bba4353>] lo_ioctl+0x8b/0x1b90 drivers/block/loop.c:1355 1 lock held by syz-executor4/11623: #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<000000009bba4353>] lo_ioctl+0x8b/0x1b90 drivers/block/loop.c:1355 1 lock held by syz-executor4/11629: #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<000000009bba4353>] lo_ioctl+0x8b/0x1b90 drivers/block/loop.c:1355 1 lock held by syz-executor4/11633: #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<000000009bba4353>] lo_ioctl+0x8b/0x1b90 drivers/block/loop.c:1355 1 lock held by syz-executor4/11646: #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<000000009bba4353>] lo_ioctl+0x8b/0x1b90 drivers/block/loop.c:1355 1 lock held by syz-executor4/11656: #0: (&lo->lo_ctl_mutex/1){+.+.}, at: [<000000009bba4353>] lo_ioctl+0x8b/0x1b90 drivers/block/loop.c:1355 ============================================= NMI backtrace for cpu 0 CPU: 0 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 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 0 Comm: swapper/1 Not tainted 4.15.0-rc1-next-20171201+ #57 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 task: 00000000c3596e67 task.stack: 000000008bf43542 RIP: 0010:trace_softirqs_off+0x109/0x340 kernel/locking/lockdep.c:3044 RSP: 0018:ffff8801db507d08 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffff8801da388300 RCX: 1ffff1003b6a35f1 RDX: 1ffff1003b47116e RSI: 0000000080000001 RDI: ffff8801da388b70 RBP: ffff8801db507d20 R08: 0000000000000000 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801da388300 R13: ffffffff8142b427 R14: ffff8801db507e68 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ff0f8993ef0 CR3: 00000001d187f000 CR4: 00000000001406e0 DR0: 0000000020001000 DR1: 0000000020001000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: __local_bh_disable_ip+0xae/0x120 kernel/softirq.c:125 local_bh_disable include/linux/bottom_half.h:19 [inline] irq_enter+0xb8/0xe0 kernel/softirq.c:345 scheduler_ipi+0x246/0x830 kernel/sched/core.c:1794 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:ffff8801da397da8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff02 RAX: dffffc0000000000 RBX: 1ffff1003b472fb8 RCX: 0000000000000000 RDX: 1ffffffff0bd9744 RSI: 0000000000000001 RDI: ffffffff85ecba20 RBP: ffff8801da397da8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000001 R13: ffff8801da397e60 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 start_secondary+0x2dd/0x3e0 arch/x86/kernel/smpboot.c:277 secondary_startup_64+0xa5/0xb0 arch/x86/kernel/head_64.S:237 Code: 00 00 00 48 8d bb 70 08 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e ec 01 00 00 <8b> 8b 70 08 00 00 85 c9 0f 84 b5 00 00 00 48 8d bb 58 08 00 00