netlink: 3 bytes leftover after parsing attributes in process `syz-executor7'.
INFO: task syz-executor0:21790 blocked for more than 120 seconds.
      Not tainted 4.9.103-g7fd4075 #36
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D30176 21790  13097 0x00000004
 ffff8801958cb000 0000000000000000 ffff8801d56db480 ffff8801d9a6b000
 ffff8801db321c18 ffff8801d3087ce8 ffffffff839e711d ffff8801958cb8c8
 ffffed0032b19718 ffff8801958cb000 00fffc0000000000 ffff8801db3224e8
Call Trace:
 [<ffffffff839e871f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839e90a3>] schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3590
 [<ffffffff839ed526>] __mutex_lock_common kernel/locking/mutex.c:582 [inline]
 [<ffffffff839ed526>] mutex_lock_nested+0x326/0x870 kernel/locking/mutex.c:621
 [<ffffffff815d7a4c>] __fdget_pos+0xac/0xd0 fs/file.c:781
 [<ffffffff8157635e>] fdget_pos include/linux/file.h:66 [inline]
 [<ffffffff8157635e>] SYSC_write fs/read_write.c:599 [inline]
 [<ffffffff8157635e>] SyS_write+0x7e/0x1c0 fs/read_write.c:596
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f8013>] 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: [<ffffffff8136688c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8136688c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81425e10>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/3774:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f61c2>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff8211f1d2>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133
1 lock held by syz-executor0/21790:
 #0:  (&f->f_pos_lock){+.+.+.}, at: [<ffffffff815d7a4c>] __fdget_pos+0xac/0xd0 fs/file.c:781

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

NMI backtrace for cpu 1
CPU: 1 PID: 519 Comm: khungtaskd Not tainted 4.9.103-g7fd4075 #36
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d848fd08 ffffffff81eb34a9 0000000000000000 0000000000000001
 0000000000000001 0000000000000001 ffffffff810b9590 ffff8801d848fd40
 ffffffff81ebe7a7 0000000000000001 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb34a9>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb34a9>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebe7a7>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebe73a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b9694>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81366e24>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81366e24>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81366e24>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81366e24>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119cead>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f81dc>] 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: 21720 Comm: syz-executor0 Not tainted 4.9.103-g7fd4075 #36
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801c9e61800 task.stack: ffff88018b938000
RIP: 0010:[<ffffffff81230d15>] 
c [<ffffffff81230d15>] arch_local_save_flags arch/x86/include/asm/paravirt.h:763 [inline]
RIP: 0010:[<ffffffff81230d15>] 
c [<ffffffff81230d15>] arch_local_irq_save arch/x86/include/asm/paravirt.h:785 [inline]
RIP: 0010:[<ffffffff81230d15>] 
c [<ffffffff81230d15>] lock_is_held+0x55/0x140 kernel/locking/lockdep.c:3790
RSP: 0018:ffff8801db207738  EFLAGS: 00000046
RAX: 0000000000000000 RBX: ffff8801c9e61800 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff81f1af0b RDI: ffff8801c9e620c4
RBP: ffff8801db207758 R08: ffff8801c9e621b0 R09: 0000000000000001
R10: ffff8801c9e61800 R11: 1ffff100393cc431 R12: ffff8801db207ae8
R13: ffffffff846def20 R14: 0000000000000008 R15: ffff8801db207c00
FS:  00007f8ecad2e700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f8ecacebdb8 CR3: 00000001c1d30000 CR4: 00000000001606f0
DR0: 00000000200001c0 DR1: 00000000200001c0 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 0000000000000046
c 0000000000000000
c ffff8801db207ae8
c ffff8801b6cc5d80
c
 ffff8801db207768
c ffffffff8127c484
c ffff8801db207a68
c ffffffff8141b10f
c
 ffffffff8141a9c0
c 1ffff1003b640ef9
c ffff8801db207828
c ffff8801b6cc5d80
c
Call Trace:
 <IRQ> 
d [<ffffffff8127c484>] rcu_read_lock_held+0xa4/0xc0 kernel/rcu/update.c:297
 [<ffffffff8141b10f>] __perf_output_begin kernel/events/ring_buffer.c:138 [inline]
 [<ffffffff8141b10f>] perf_output_begin_forward+0x74f/0x9d0 kernel/events/ring_buffer.c:237
 [<ffffffff814159fc>] __perf_event_output kernel/events/core.c:6061 [inline]
 [<ffffffff814159fc>] perf_event_output_forward+0x10c/0x230 kernel/events/core.c:6077
 [<ffffffff813f7dbf>] __perf_event_overflow+0x11f/0x320 kernel/events/core.c:7177
 [<ffffffff813f998d>] perf_swevent_hrtimer+0x21d/0x360 kernel/events/core.c:8368
 [<ffffffff812a4875>] __run_hrtimer kernel/time/hrtimer.c:1255 [inline]
 [<ffffffff812a4875>] __hrtimer_run_queues+0x375/0xe50 kernel/time/hrtimer.c:1319
 [<ffffffff812a5db1>] hrtimer_interrupt+0x1b1/0x430 kernel/time/hrtimer.c:1353
 [<ffffffff810b1d84>] local_apic_timer_interrupt+0x74/0xa0 arch/x86/kernel/apic/apic.c:935
 [<ffffffff839fd7dc>] smp_apic_timer_interrupt+0x7c/0xa0 arch/x86/kernel/apic/apic.c:959
 [<ffffffff839f9970>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:648
 <EOI> 
d [<ffffffff8143a178>] ? pagecache_get_page+0x148/0x720 mm/filemap.c:1232
 [<ffffffff81623842>] find_get_page_flags include/linux/pagemap.h:264 [inline]
 [<ffffffff81623842>] __find_get_block_slow+0xc2/0x330 fs/buffer.c:212
 [<ffffffff81623dee>] __find_get_block+0x23e/0x4c0 fs/buffer.c:1360
 [<ffffffff81624bf9>] __getblk_slow fs/buffer.c:1101 [inline]
 [<ffffffff81624bf9>] __getblk_gfp+0x189/0x710 fs/buffer.c:1386
 [<ffffffff8162859d>] __bread_gfp+0x2d/0x270 fs/buffer.c:1420
 [<ffffffff818c3681>] sb_bread include/linux/buffer_head.h:300 [inline]
 [<ffffffff818c3681>] fat12_ent_bread+0x231/0x400 fs/fat/fatent.c:84
 [<ffffffff818c5a1b>] fat_ent_read_block fs/fat/fatent.c:441 [inline]
 [<ffffffff818c5a1b>] fat_alloc_clusters+0x51b/0xe10 fs/fat/fatent.c:489
 [<ffffffff818d2bef>] fat_add_cluster+0x6f/0xe0 fs/fat/inode.c:100
 [<ffffffff818d2f3f>] __fat_get_block fs/fat/inode.c:147 [inline]
 [<ffffffff818d2f3f>] fat_get_block+0x2df/0x800 fs/fat/inode.c:176
 [<ffffffff816297e1>] __block_write_begin_int+0x391/0x1040 fs/buffer.c:1987
 [<ffffffff8162a52f>] __block_write_begin fs/buffer.c:2038 [inline]
 [<ffffffff8162a52f>] block_write_begin+0x5f/0x180 fs/buffer.c:2097
 [<ffffffff8162ab43>] cont_write_begin+0x4f3/0x810 fs/buffer.c:2450
 [<ffffffff818cf0aa>] fat_write_begin+0x9a/0x120 fs/fat/inode.c:222
 [<ffffffff81435de1>] generic_perform_write+0x301/0x510 mm/filemap.c:2740
 [<ffffffff8143d7ba>] __generic_file_write_iter+0x29a/0x540 mm/filemap.c:2833
 [<ffffffff8143dd40>] generic_file_write_iter+0x2e0/0x610 mm/filemap.c:2893
 [<ffffffff8156e790>] new_sync_write fs/read_write.c:496 [inline]
 [<ffffffff8156e790>] __vfs_write+0x3e0/0x580 fs/read_write.c:509
 [<ffffffff81572587>] vfs_write+0x187/0x530 fs/read_write.c:557
 [<ffffffff815763b9>] SYSC_write fs/read_write.c:604 [inline]
 [<ffffffff815763b9>] SyS_write+0xd9/0x1c0 fs/read_write.c:596
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f8013>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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c