IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
INFO: task syz-executor7:11402 blocked for more than 120 seconds.
      Not tainted 4.9.101-gaef17a5 #29
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor7   D28584 11402  10452 0x00000004
 ffff8801b6d31800 ffff8801caa53480 ffff8801caa20540 ffff8801d37d4800
 ffff8801db221b98 ffff8801d737f580 ffffffff839e39bd ffffffff81233857
 0000000000000000 ffff8801b6d320c0 0000000600000007 ffff8801db222468
Call Trace:
 [<ffffffff839e4fbf>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839ef3e4>] rwsem_down_read_failed+0x1e4/0x320 kernel/locking/rwsem-xadd.c:260
 [<ffffffff81ee52b8>] call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 [<ffffffff839ee312>] __down_read arch/x86/include/asm/rwsem.h:65 [inline]
 [<ffffffff839ee312>] down_read+0x52/0xb0 kernel/locking/rwsem.c:24
 [<ffffffff81578689>] get_super.part.9+0x119/0x1f0 fs/super.c:665
 [<ffffffff8157878b>] get_super+0x2b/0x50 include/linux/spinlock.h:302
 [<ffffffff816313e7>] fsync_bdev+0x17/0xc0 fs/block_dev.c:214
 [<ffffffff81e58b65>] invalidate_partition+0x35/0x60 block/genhd.c:1412
 [<ffffffff81e62107>] drop_partitions block/partition-generic.c:423 [inline]
 [<ffffffff81e62107>] rescan_partitions+0xc7/0x660 block/partition-generic.c:446
 [<ffffffff81e535e4>] __blkdev_reread_part+0x164/0x1f0 block/ioctl.c:170
 [<ffffffff81e53696>] blkdev_reread_part+0x26/0x40 block/ioctl.c:190
 [<ffffffff825c3f1c>] loop_reread_partitions+0x7c/0x90 drivers/block/loop.c:637
 [<ffffffff825c49ae>] loop_set_status+0xa7e/0xfe0 drivers/block/loop.c:1171
 [<ffffffff825c53af>] loop_set_status64+0xbf/0x110 drivers/block/loop.c:1280
 [<ffffffff825c7bb6>] lo_ioctl+0x406/0x1aa0 drivers/block/loop.c:1370
 [<ffffffff81e54c06>] __blkdev_driver_ioctl block/ioctl.c:294 [inline]
 [<ffffffff81e54c06>] blkdev_ioctl+0x7b6/0x1a70 block/ioctl.c:590
 [<ffffffff816302fe>] block_ioctl+0xde/0x120 fs/block_dev.c:1688
 [<ffffffff815b052c>] vfs_ioctl fs/ioctl.c:43 [inline]
 [<ffffffff815b052c>] file_ioctl fs/ioctl.c:493 [inline]
 [<ffffffff815b052c>] do_vfs_ioctl+0x1ac/0x11a0 fs/ioctl.c:677
 [<ffffffff815b15af>] SYSC_ioctl fs/ioctl.c:694 [inline]
 [<ffffffff815b15af>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f4893>] 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: [<ffffffff8136477c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8136477c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.?..}, at: [<ffffffff81423c90>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/3769:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f2a62>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+...}, at: [<ffffffff8211cd32>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133
3 locks held by syz-executor7/11402:
 #0:  (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<ffffffff825c783b>] lo_ioctl+0x8b/0x1aa0 drivers/block/loop.c:1344
 #1:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff81e5368e>] blkdev_reread_part+0x1e/0x40 block/ioctl.c:189
 #2:  (&type->s_umount_key#52){++++..}, at: [<ffffffff81578689>] get_super.part.9+0x119/0x1f0 fs/super.c:665
1 lock held by syz-executor7/11411:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff8162ea0c>] __blkdev_get+0x10c/0xd60 fs/block_dev.c:1268
1 lock held by syz-executor7/11414:
 #0:  (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<ffffffff825c783b>] lo_ioctl+0x8b/0x1aa0 drivers/block/loop.c:1344
1 lock held by blkid/11406:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff8162ea0c>] __blkdev_get+0x10c/0xd60 fs/block_dev.c:1268
1 lock held by syz-executor4/11432:
 #0:  (&type->s_umount_key#52){++++..}, at: [<ffffffff8157a5f1>] iterate_supers+0xe1/0x260 fs/super.c:591
1 lock held by syz-executor4/11446:
 #0:  (&type->s_umount_key#52){++++..}, at: [<ffffffff8157a5f1>] iterate_supers+0xe1/0x260 fs/super.c:591

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

NMI backtrace for cpu 0
CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.101-gaef17a5 #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d908fd08 ffffffff81eb1009 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810b7da0 ffff8801d908fd40
 ffffffff81ebc307 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb1009>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb1009>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebc307>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebc29a>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b7ea4>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81364d14>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81364d14>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81364d14>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81364d14>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119ad9d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f4a5c>] ret_from_fork+0x5c/0x70 arch/x86/entry/entry_64.S:373
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 11371 Comm: syz-executor0 Not tainted 4.9.101-gaef17a5 #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801b8c58000 task.stack: ffff88018b388000
RIP: 0010:[<ffffffff811b9bd5>] 
c [<ffffffff811b9bd5>] preempt_count_add+0x25/0x170 kernel/sched/core.c:3242
RSP: 0018:ffff8801db307ca8  EFLAGS: 00000802
RAX: dffffc0000000000 RBX: 0000000000000001 RCX: 0000000000000000
RDX: 0000000000000004 RSI: 0000000000000000 RDI: ffffffff85b2d700
RBP: ffff8801db307cb8 R08: ffff8801b8c58910 R09: 0000000000000001
R10: ffff8801b8c58000 R11: 1ffff1003718b11d R12: 0000000000000092
R13: ffffffff846e89e0 R14: ffff8801cf4bd648 R15: dffffc0000000000
FS:  00007f5e423bc700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f97f620e000 CR3: 0000000193af0000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff85c0cf08
c 0000000000000092
c ffff8801db307ce0
c ffffffff839f47be
c
 0000000300000002
c 000000000007a180
c 1ffff1003b660fa0
c ffff8801db307db0
c
 ffffffff81f1b5ac
c ffff8801db31c898
c ffffffff85c0cf08
c 0000000041b58ab3
c
Call Trace:
 <IRQ> 
d [<ffffffff839f47be>] __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
 <IRQ> 
d [<ffffffff839f47be>] _raw_spin_lock_irqsave+0x2e/0x62 kernel/locking/spinlock.c:159
 [<ffffffff81f1b5ac>] debug_object_activate+0x11c/0x4e0 lib/debugobjects.c:407
 [<ffffffff812a0417>] debug_hrtimer_activate kernel/time/hrtimer.c:398 [inline]
 [<ffffffff812a0417>] debug_activate kernel/time/hrtimer.c:444 [inline]
 [<ffffffff812a0417>] enqueue_hrtimer+0x27/0x3a0 kernel/time/hrtimer.c:869
 [<ffffffff812a2a57>] __run_hrtimer kernel/time/hrtimer.c:1270 [inline]
 [<ffffffff812a2a57>] __hrtimer_run_queues+0x667/0xe50 kernel/time/hrtimer.c:1319
 [<ffffffff812a3ca1>] hrtimer_interrupt+0x1b1/0x430 kernel/time/hrtimer.c:1353
 [<ffffffff810b0594>] local_apic_timer_interrupt+0x74/0xa0 arch/x86/kernel/apic/apic.c:935
 [<ffffffff839fa05c>] smp_apic_timer_interrupt+0x7c/0xa0 arch/x86/kernel/apic/apic.c:959
 [<ffffffff839f61f0>] apic_timer_interrupt+0xa0/0xb0 arch/x86/entry/entry_64.S:648
 <EOI> 
d [<ffffffff81621a9a>] ? arch_local_irq_enable arch/x86/include/asm/paravirt.h:778 [inline]
 <EOI> 
d [<ffffffff81621a9a>] ? lookup_bh_lru fs/buffer.c:1344 [inline]
 <EOI> 
d [<ffffffff81621a9a>] ? __find_get_block+0x18a/0x4c0 fs/buffer.c:1356
 [<ffffffff81622959>] __getblk_slow fs/buffer.c:1101 [inline]
 [<ffffffff81622959>] __getblk_gfp+0x189/0x710 fs/buffer.c:1386
 [<ffffffff816262fd>] __bread_gfp+0x2d/0x270 fs/buffer.c:1420
 [<ffffffff818b4088>] sb_bread include/linux/buffer_head.h:300 [inline]
 [<ffffffff818b4088>] fat__get_entry+0x4c8/0x8f0 fs/fat/dir.c:100
 [<ffffffff818b6d11>] fat_get_entry fs/fat/dir.c:128 [inline]
 [<ffffffff818b6d11>] fat_get_short_entry+0x131/0x2a0 fs/fat/dir.c:876
 [<ffffffff818bec77>] fat_subdirs+0xc7/0x190 fs/fat/dir.c:942
 [<ffffffff818cef89>] fat_read_root fs/fat/inode.c:1402 [inline]
 [<ffffffff818cef89>] fat_fill_super+0x1cf9/0x3550 fs/fat/inode.c:1832
 [<ffffffff818d5d41>] vfat_fill_super+0x31/0x40 fs/fat/namei_vfat.c:1070
 [<ffffffff81579d67>] mount_bdev+0x2c7/0x390 fs/super.c:1100
 [<ffffffff818d5d04>] vfat_mount+0x34/0x40 fs/fat/namei_vfat.c:1077
 [<ffffffff8157baec>] mount_fs+0x28c/0x370 fs/super.c:1206
 [<ffffffff815db091>] vfs_kern_mount.part.29+0xd1/0x3d0 fs/namespace.c:991
 [<ffffffff815e29b9>] vfs_kern_mount fs/namespace.c:973 [inline]
 [<ffffffff815e29b9>] do_new_mount fs/namespace.c:2513 [inline]
 [<ffffffff815e29b9>] do_mount+0x3c9/0x2740 fs/namespace.c:2835
 [<ffffffff815e570e>] SYSC_mount fs/namespace.c:3051 [inline]
 [<ffffffff815e570e>] SyS_mount+0xfe/0x110 fs/namespace.c:3028
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f4893>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
c07 
c00 
cc9 
cc3 
c66 
c90 
c48 
cb8 
c00 
c00 
c00 
c00 
c00 
cfc 
cff 
cdf 
c55 
c48 
c89 
ce5 
c41 
c54 
c53 
c89 
cfb 
c48 
cc7 
cc7 
c00 
cd7 
cb2 
c85 
c48 
c89 
cfa 
c48 
cc1 
cea 
c03 
c0f 
cb6 
c14 
c02 
c<48> 
c89 
cf8 
c83 
ce0 
c07 
c83 
cc0 
c03 
c38 
cd0 
c7c 
c08 
c84 
cd2 
c0f 
c85 
c0d 
c01 
c00 
c00 
c