netlink: 4 bytes leftover after parsing attributes in process `syz-executor7'.
INFO: task syz-executor0:3851 blocked for more than 120 seconds.
      Not tainted 4.9.96-g71fce1e #10
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D25816  3851      1 0x00000004
 ffff88019eea1800 ffff880195e00540 ffff8801d8b17480 ffff880195d8b000
 ffff8801db221b98 ffff88019e81f4e8 ffffffff839e240d ffff88019eea20c8
 ffffed0033dd4418 ffff88019eea1800 00fffc0000000000 ffff8801db222468
Call Trace:
 [<ffffffff839e3a0f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839e4393>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3590
 [<ffffffff839e8816>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff839e8816>] mutex_lock_nested+0x326/0x870 kernel/locking/mutex.c:621
 [<ffffffff825c9874>] loop_probe+0x74/0x180 drivers/block/loop.c:1886
 [<ffffffff8256ec03>] kobj_lookup+0x223/0x410 drivers/base/map.c:124
 [<ffffffff81e57a19>] get_gendisk+0x39/0x2d0 block/genhd.c:716
 [<ffffffff8162ec81>] __blkdev_get+0x351/0xd60 fs/block_dev.c:1262
 [<ffffffff81631f2a>] blkdev_get+0x2da/0x920 fs/block_dev.c:1416
 [<ffffffff81632785>] blkdev_open+0x1a5/0x250 fs/block_dev.c:1571
 [<ffffffff81567583>] do_dentry_open+0x703/0xc80 fs/open.c:766
 [<ffffffff8156ad6c>] vfs_open+0x11c/0x210 fs/open.c:879
 [<ffffffff815a1ea8>] do_last fs/namei.c:3410 [inline]
 [<ffffffff815a1ea8>] path_openat+0x758/0x3590 fs/namei.c:3534
 [<ffffffff815a8fa7>] do_filp_open+0x197/0x270 fs/namei.c:3568
 [<ffffffff8156b77d>] do_sys_open+0x30d/0x5c0 fs/open.c:1072
 [<ffffffff8156ba5d>] SYSC_open fs/open.c:1090 [inline]
 [<ffffffff8156ba5d>] SyS_open+0x2d/0x40 fs/open.c:1085
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f3313>] 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: [<ffffffff813646ec>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff813646ec>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81423ce0>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/3746:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f14b2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff8211c792>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133
1 lock held by syz-executor0/3851:
 #0:  (loop_index_mutex){+.+.+.}, at: [<ffffffff825c9874>] loop_probe+0x74/0x180 drivers/block/loop.c:1886
2 locks held by syz-executor6/3862:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff8162ea3c>] __blkdev_get+0x10c/0xd60 fs/block_dev.c:1268
 #1:  (loop_index_mutex){+.+.+.}, at: [<ffffffff825c203b>] lo_open+0x1b/0xa0 drivers/block/loop.c:1555
1 lock held by syz-executor7/3875:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff8162ea3c>] __blkdev_get+0x10c/0xd60 fs/block_dev.c:1268
1 lock held by syz-executor1/12164:
 #0:  (loop_index_mutex){+.+.+.}, at: [<ffffffff825c9874>] loop_probe+0x74/0x180 drivers/block/loop.c:1886
2 locks held by syz-executor4/13944:
 #0:  (loop_index_mutex){+.+.+.}, at: [<ffffffff825c957a>] loop_control_ioctl+0x7a/0x300 drivers/block/loop.c:1906
 #1:  (&lo->lo_ctl_mutex#2){+.+.+.}, at: [<ffffffff825c9686>] loop_control_ioctl+0x186/0x300 drivers/block/loop.c:1920
2 locks held by syz-executor2/13957:
 #0:  (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<ffffffff825c6f9b>] lo_ioctl+0x8b/0x1aa0 drivers/block/loop.c:1344
 #1:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff81e531ee>] blkdev_reread_part+0x1e/0x40 block/ioctl.c:189
2 locks held by blkid/13996:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff8162ea3c>] __blkdev_get+0x10c/0xd60 fs/block_dev.c:1268
 #1:  (loop_index_mutex){+.+.+.}, at: [<ffffffff825c203b>] lo_open+0x1b/0xa0 drivers/block/loop.c:1555
2 locks held by blkid/13998:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff8162ea3c>] __blkdev_get+0x10c/0xd60 fs/block_dev.c:1268
 #1:  (loop_index_mutex){+.+.+.}, at: [<ffffffff825c203b>] lo_open+0x1b/0xa0 drivers/block/loop.c:1555

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.96-g71fce1e #10
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d8ee7d08 ffffffff81eb0b69 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810b7d60 ffff8801d8ee7d40
 ffffffff81ebbe97 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb0b69>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb0b69>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebbe97>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebbe2a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b7e64>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81364c84>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81364c84>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81364c84>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81364c84>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119ad5d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f34dc>] 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: 0 Comm: swapper/0 Not tainted 4.9.96-g71fce1e #10
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffffffff84429800 task.stack: ffffffff84400000
RIP: 0010:[<ffffffff811e2198>] 
c [<ffffffff811e2198>] task_running kernel/sched/sched.h:1151 [inline]
RIP: 0010:[<ffffffff811e2198>] 
c [<ffffffff811e2198>] can_migrate_task+0x248/0xa20 kernel/sched/fair.c:7972
RSP: 0018:ffff8801db207bb8  EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff8801d8e20000 RCX: ffff8801d9aec8a8
RDX: 1ffff1003b1c4007 RSI: ffff8801db321b98 RDI: ffff8801d8e20038
RBP: ffff8801db207c10 R08: ffff8801db322520 R09: ffff8801d8e20000
R10: ffffed0043fffa01 R11: 0000000000000001 R12: ffffffff84670420
R13: 0000000000000001 R14: ffff8801db207d88 R15: ffff8801db207ce8
FS:  0000000000000000(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000242e000 CR3: 00000001bb1cd000 CR4: 00000000001606f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 ffffffff8442a0c0
c 0000000000000046
c ffff8801db207d28
c ffff8801db207d30
c
 1ffffffff094bcf8
c ffffed003b640fa5
c ffff8801db321b80
c ffff8801db321b80
c
 dffffc0000000000
c ffff8801db207d88
c ffff8801d8e200a8
c ffff8801db207db0
c
Call Trace:
 <IRQ> 
d [<ffffffff81201216>] detach_tasks kernel/sched/fair.c:8086 [inline]
 <IRQ> 
d [<ffffffff81201216>] load_balance+0x816/0x2fa0 kernel/sched/fair.c:9511
 [<ffffffff81205e8e>] rebalance_domains+0x6be/0xbc0 kernel/sched/fair.c:10114
 [<ffffffff81206689>] run_rebalance_domains+0x2f9/0x510 kernel/sched/fair.c:10332
 [<ffffffff839f9efb>] __do_softirq+0x20b/0x937 kernel/softirq.c:284
 [<ffffffff81149037>] invoke_softirq kernel/softirq.c:364 [inline]
 [<ffffffff81149037>] irq_exit+0x147/0x190 kernel/softirq.c:405
 [<ffffffff839f7aa1>] smp_reschedule_interrupt+0x71/0x90 arch/x86/kernel/smp.c:270
 [<ffffffff839f5610>] reschedule_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:671
 <EOI> 
d [<ffffffff839f1f16>] ? native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:53
 [<ffffffff839f1555>] arch_safe_halt arch/x86/include/asm/paravirt.h:104 [inline]
 [<ffffffff839f1555>] default_idle+0x55/0x360 arch/x86/kernel/process.c:295
 [<ffffffff81069fa0>] arch_cpu_idle+0x10/0x20 arch/x86/kernel/process.c:286
 [<ffffffff839f2375>] default_idle_call+0x45/0x60 kernel/sched/idle.c:97
 [<ffffffff81220e65>] cpuidle_idle_call kernel/sched/idle.c:155 [inline]
 [<ffffffff81220e65>] cpu_idle_loop kernel/sched/idle.c:248 [inline]
 [<ffffffff81220e65>] cpu_startup_entry+0x2b5/0x380 kernel/sched/idle.c:303
 [<ffffffff839df1dc>] rest_init+0x183/0x189 init/main.c:409
 [<ffffffff84a96943>] start_kernel+0x67e/0x6b2 init/main.c:664
 [<ffffffff84a9529a>] x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:196
 [<ffffffff84a953db>] x86_64_start_kernel+0x13f/0x162 arch/x86/kernel/head64.c:177
Code: 
c48 
cfe 
c48 
c8d 
c7b 
c38 
c48 
cb8 
c00 
c00 
c00 
c00 
c00 
cfc 
cff 
cdf 
c48 
c89 
cfa 
c48 
cc1 
cea 
c03 
c0f 
cb6 
c04 
c02 
c84 
cc0 
c74 
c08 
c3c 
c03 
c0f 
c8e 
cdb 
c06 
c00 
c00 
c44 
c8b 
c6b 
c38 
c<45> 
c85 
ced 
c0f 
c84 
cbb 
c00 
c00 
c00 
c48 
cc7 
cc7 
c80 
c73 
cc9 
c84 
c48 
cb8 
c00 
c00 
c00 
c