IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
INFO: task syz-executor5:9523 blocked for more than 120 seconds.
      Not tainted 4.9.109-ga4230be #48
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor5   D28584  9523   7913 0x00000004
 ffff8801c4484800 0000000000000000 ffff8801c9301500 ffff8801d99b3000
 ffff8801db221c18 ffff8801b6db7580 ffffffff839e8a8d ffff8801d382e688
 0000000000000000 0000000000000000 0000000000000000 ffff8801db2224e8
Call Trace:
 [<ffffffff839ea08f>] schedule+0x7f/0x1b0 kernel/sched/core.c:3557
 [<ffffffff839f44b4>] rwsem_down_read_failed+0x1e4/0x320 kernel/locking/rwsem-xadd.c:260
 [<ffffffff81ee80d8>] call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 [<ffffffff839f33e2>] __down_read arch/x86/include/asm/rwsem.h:65 [inline]
 [<ffffffff839f33e2>] down_read+0x52/0xb0 kernel/locking/rwsem.c:24
 [<ffffffff8157acf9>] get_super.part.9+0x119/0x1f0 fs/super.c:665
 [<ffffffff8157adfb>] get_super+0x2b/0x50 include/linux/spinlock.h:302
 [<ffffffff81633c77>] fsync_bdev+0x17/0xc0 fs/block_dev.c:214
 [<ffffffff81e5b985>] invalidate_partition+0x35/0x60 block/genhd.c:1412
 [<ffffffff81e64f27>] drop_partitions block/partition-generic.c:423 [inline]
 [<ffffffff81e64f27>] rescan_partitions+0xc7/0x660 block/partition-generic.c:446
 [<ffffffff81e56404>] __blkdev_reread_part+0x164/0x1f0 block/ioctl.c:170
 [<ffffffff81e564b6>] blkdev_reread_part+0x26/0x40 block/ioctl.c:190
 [<ffffffff825c6f5c>] loop_reread_partitions+0x7c/0x90 drivers/block/loop.c:637
 [<ffffffff825c79ee>] loop_set_status+0xa7e/0xfe0 drivers/block/loop.c:1171
 [<ffffffff825c83ef>] loop_set_status64+0xbf/0x110 drivers/block/loop.c:1280
 [<ffffffff825cabf6>] lo_ioctl+0x406/0x1aa0 drivers/block/loop.c:1370
 [<ffffffff81e57a26>] __blkdev_driver_ioctl block/ioctl.c:294 [inline]
 [<ffffffff81e57a26>] blkdev_ioctl+0x7b6/0x1a70 block/ioctl.c:590
 [<ffffffff81632b8e>] block_ioctl+0xde/0x120 fs/block_dev.c:1688
 [<ffffffff815b2b9c>] vfs_ioctl fs/ioctl.c:43 [inline]
 [<ffffffff815b2b9c>] file_ioctl fs/ioctl.c:493 [inline]
 [<ffffffff815b2b9c>] do_vfs_ioctl+0x1ac/0x11a0 fs/ioctl.c:677
 [<ffffffff815b3c1f>] SYSC_ioctl fs/ioctl.c:694 [inline]
 [<ffffffff815b3c1f>] SyS_ioctl+0x8f/0xc0 fs/ioctl.c:685
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9993>] 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: [<ffffffff8136662c>] check_hung_uninterruptible_tasks kernel/hung_task.c:168 [inline]
 #0:  (rcu_read_lock){......}, at: [<ffffffff8136662c>] watchdog+0x11c/0xa20 kernel/hung_task.c:239
 #1:  (tasklist_lock){.+.+..}, at: [<ffffffff81425cb7>] debug_show_all_locks+0x79/0x218 kernel/locking/lockdep.c:4336
2 locks held by getty/3776:
 #0:  (&tty->ldisc_sem){++++++}, at: [<ffffffff839f7b32>] ldsem_down_read+0x32/0x40 drivers/tty/tty_ldsem.c:367
 #1:  (&ldata->atomic_read_lock){+.+.+.}, at: [<ffffffff8211fce2>] n_tty_read+0x202/0x16e0 drivers/tty/n_tty.c:2133
3 locks held by syz-executor5/9523:
 #0:  (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<ffffffff825ca87b>] lo_ioctl+0x8b/0x1aa0 drivers/block/loop.c:1344
 #1:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff81e564ae>] blkdev_reread_part+0x1e/0x40 block/ioctl.c:189
 #2:  (&type->s_umount_key#55){.+.+..}, at: [<ffffffff8157acf9>] get_super.part.9+0x119/0x1f0 fs/super.c:665
1 lock held by syz-executor5/9553:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff8163129c>] __blkdev_get+0x10c/0xd60 fs/block_dev.c:1268
1 lock held by syz-executor5/9555:
 #0:  (&lo->lo_ctl_mutex/1){+.+.+.}, at: [<ffffffff825ca87b>] lo_ioctl+0x8b/0x1aa0 drivers/block/loop.c:1344
1 lock held by syz-executor7/9552:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff8163129c>] __blkdev_get+0x10c/0xd60 fs/block_dev.c:1268
1 lock held by blkid/9538:
 #0:  (&bdev->bd_mutex){+.+.+.}, at: [<ffffffff8163129c>] __blkdev_get+0x10c/0xd60 fs/block_dev.c:1268

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

NMI backtrace for cpu 0
CPU: 0 PID: 519 Comm: khungtaskd Not tainted 4.9.109-ga4230be #48
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d97ffd08 ffffffff81eb3e29 0000000000000000 0000000000000000
 0000000000000000 0000000000000001 ffffffff810b9580 ffff8801d97ffd40
 ffffffff81ebf127 0000000000000000 0000000000000000 0000000000000003
Call Trace:
 [<ffffffff81eb3e29>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb3e29>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81ebf127>] nmi_cpu_backtrace.cold.2+0x48/0x87 lib/nmi_backtrace.c:99
 [<ffffffff81ebf0ba>] nmi_trigger_cpumask_backtrace+0x12a/0x14f lib/nmi_backtrace.c:60
 [<ffffffff810b9684>] arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:37
 [<ffffffff81366bc4>] trigger_all_cpu_backtrace include/linux/nmi.h:58 [inline]
 [<ffffffff81366bc4>] check_hung_task kernel/hung_task.c:125 [inline]
 [<ffffffff81366bc4>] check_hung_uninterruptible_tasks kernel/hung_task.c:182 [inline]
 [<ffffffff81366bc4>] watchdog+0x6b4/0xa20 kernel/hung_task.c:239
 [<ffffffff8119d04d>] kthread+0x26d/0x300 kernel/kthread.c:211
 [<ffffffff839f9b5c>] 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: 9518 Comm: syz-executor7 Not tainted 4.9.109-ga4230be #48
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801b6699800 task.stack: ffff8801b6860000
RIP: 0010:[<ffffffff8135e960>] 
c [<ffffffff8135e960>] check_kcov_mode kernel/kcov.c:66 [inline]
RIP: 0010:[<ffffffff8135e960>] 
c [<ffffffff8135e960>] __sanitizer_cov_trace_pc+0x20/0x50 kernel/kcov.c:100
RSP: 0018:ffff8801b6867688  EFLAGS: 00000246
RAX: ffff8801b6699800 RBX: 000000000000003f RCX: ffffc900026d4000
RDX: 0000000000000000 RSI: ffffffff81ec396c RDI: ffff8801b700b190
RBP: ffff8801b6867688 R08: ffff8801b669a110 R09: 0000000000000001
R10: ffff8801b6699800 R11: 1ffff10036cd341d R12: ffff8801b700b190
R13: ffff88018032f701 R14: dffffc0000000000 R15: ffff8801b700b188
FS:  00007facfa743700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd6f35a69b8 CR3: 00000001b78dd000 CR4: 00000000001606f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 ffff8801b68676f8
c ffffffff81ec396c
c ffff8801b700b198
c ffff8801b6867728
c
 0000000000000000
c ffffed0036e01633
c ffff8801b700b190
c 0000000000000024
c
 ffff8801b6867780
c 1ffff10036d0cee1
c ffff8801b700b190
c 0000000000000024
c
Call Trace:
 [<ffffffff81ec396c>] entry_to_node include/linux/radix-tree.h:451 [inline]
 [<ffffffff81ec396c>] __radix_tree_lookup+0xcc/0x2f0 lib/radix-tree.c:696
 [<ffffffff81ec3c02>] radix_tree_lookup_slot+0x72/0xc0 lib/radix-tree.c:725
 [<ffffffff81438b3e>] find_get_entry+0x8e/0x540 mm/filemap.c:1095
 [<ffffffff81439f2b>] pagecache_get_page+0x4b/0x720 mm/filemap.c:1203
 [<ffffffff81623e32>] find_get_page_flags include/linux/pagemap.h:264 [inline]
 [<ffffffff81623e32>] __find_get_block_slow+0xc2/0x330 fs/buffer.c:212
 [<ffffffff816243de>] __find_get_block+0x23e/0x4c0 fs/buffer.c:1360
 [<ffffffff816251e9>] __getblk_slow fs/buffer.c:1101 [inline]
 [<ffffffff816251e9>] __getblk_gfp+0x189/0x710 fs/buffer.c:1386
 [<ffffffff81628b8d>] __bread_gfp+0x2d/0x270 fs/buffer.c:1420
 [<ffffffff818e7286>] sb_bread include/linux/buffer_head.h:300 [inline]
 [<ffffffff818e7286>] isofs_fill_super+0x8a6/0x2480 fs/isofs/inode.c:617
 [<ffffffff8157c3d7>] mount_bdev+0x2c7/0x390 fs/super.c:1100
 [<ffffffff818e3494>] isofs_mount+0x34/0x40 fs/isofs/inode.c:1509
 [<ffffffff8157e15c>] mount_fs+0x28c/0x370 fs/super.c:1206
 [<ffffffff815dd921>] vfs_kern_mount.part.29+0xd1/0x3d0 fs/namespace.c:991
 [<ffffffff815e5249>] vfs_kern_mount fs/namespace.c:973 [inline]
 [<ffffffff815e5249>] do_new_mount fs/namespace.c:2513 [inline]
 [<ffffffff815e5249>] do_mount+0x3c9/0x2740 fs/namespace.c:2835
 [<ffffffff815e7f9e>] SYSC_mount fs/namespace.c:3051 [inline]
 [<ffffffff815e7f9e>] SyS_mount+0xfe/0x110 fs/namespace.c:3028
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f9993>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 
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c<8b> 
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c00 
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cfa 
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c48 
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c