INFO: task syz-executor7:4491 blocked for more than 140 seconds.
      Not tainted 4.18.0-rc4-next-20180712+ #5
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor7   D21232  4491   4484 0x00000000
Call Trace:
 context_switch kernel/sched/core.c:2853 [inline]
 __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501
 schedule+0xfb/0x450 kernel/sched/core.c:3545
 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline]
 rwsem_down_read_failed+0x362/0x600 kernel/locking/rwsem-xadd.c:286
 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 __down_read arch/x86/include/asm/rwsem.h:83 [inline]
 __percpu_down_read+0x1a0/0x290 kernel/locking/percpu-rwsem.c:86
 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:49 [inline]
 percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
 __sb_start_write+0x2d7/0x300 fs/super.c:1512
 sb_start_write include/linux/fs.h:1585 [inline]
 mnt_want_write+0x3f/0xc0 fs/namespace.c:364
 do_unlinkat+0x2b7/0xa30 fs/namei.c:4086
 __do_sys_unlink fs/namei.c:4151 [inline]
 __se_sys_unlink fs/namei.c:4149 [inline]
 __x64_sys_unlink+0x42/0x50 fs/namei.c:4149
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455b77
Code: c0 48 89 44 24 30 48 8b 2c 24 48 83 c4 08 c3 89 74 24 28 48 83 c0 02 48 89 44 24 30 48 8b 2c 24 48 83 c4 08 c3 8d 7e 20 40 80 <ff> 10 73 64 48 83 fa 02 7e c2 0f b6 54 0b 01 8d 7a 80 40 80 ff 3f 
RSP: 002b:00007ffd78aeb918 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000455b77
RDX: 00007ffd78aeb920 RSI: 00007ffd78aeb9b0 RDI: 00007ffd78aeb9b0
RBP: 00007ffd78aed6c0 R08: 0000000000000000 R09: 000000000000000d
R10: 0000000000000006 R11: 0000000000000206 R12: 0000000001366940
R13: 0000000000000000 R14: 00007ffd78aed090 R15: 0000000000702140
percpu_rw_semaphore(00000000585a150e)
  ->rw_sem.count=0xfffffffe00000001
  ->rss.gp_state=2
  ->rss.gp_count=1
  ->rss.cb_state=0
  ->rss.gp_type=1
  ->readers_block=1
  ->read_count=0
  ->list_empty(rw_sem.wait_list)=0
  ->writer.task=          (null)
INFO: task syz-executor6:4497 blocked for more than 140 seconds.
      Not tainted 4.18.0-rc4-next-20180712+ #5
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor6   D21352  4497   4488 0x00000000
Call Trace:
 context_switch kernel/sched/core.c:2853 [inline]
 __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501
 schedule+0xfb/0x450 kernel/sched/core.c:3545
 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline]
 rwsem_down_read_failed+0x362/0x600 kernel/locking/rwsem-xadd.c:286
 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 __down_read arch/x86/include/asm/rwsem.h:83 [inline]
 __percpu_down_read+0x1a0/0x290 kernel/locking/percpu-rwsem.c:86
 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:49 [inline]
 percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
 __sb_start_write+0x2d7/0x300 fs/super.c:1512
 sb_start_write include/linux/fs.h:1585 [inline]
 mnt_want_write+0x3f/0xc0 fs/namespace.c:364
 do_unlinkat+0x2b7/0xa30 fs/namei.c:4086
 __do_sys_unlink fs/namei.c:4151 [inline]
 __se_sys_unlink fs/namei.c:4149 [inline]
 __x64_sys_unlink+0x42/0x50 fs/namei.c:4149
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455b77
Code: c0 48 89 44 24 30 48 8b 2c 24 48 83 c4 08 c3 89 74 24 28 48 83 c0 02 48 89 44 24 30 48 8b 2c 24 48 83 c4 08 c3 8d 7e 20 40 80 <ff> 10 73 64 48 83 fa 02 7e c2 0f b6 54 0b 01 8d 7a 80 40 80 ff 3f 
RSP: 002b:00007fff922612c8 EFLAGS: 00000202 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000455b77
RDX: 00007fff922612d0 RSI: 00007fff92261360 RDI: 00007fff92261360
RBP: 00007fff92263070 R08: 0000000000000000 R09: 000000000000000d
R10: 0000000000000006 R11: 0000000000000202 R12: 000000000174d940
R13: 0000000000000000 R14: 00007fff92262a40 R15: 0000000000702140
percpu_rw_semaphore(00000000585a150e)
  ->rw_sem.count=0xfffffffe00000001
  ->rss.gp_state=2
  ->rss.gp_count=1
  ->rss.cb_state=0
  ->rss.gp_type=1
  ->readers_block=1
  ->read_count=0
  ->list_empty(rw_sem.wait_list)=0
  ->writer.task=          (null)
INFO: task syz-executor1:16485 blocked for more than 140 seconds.
      Not tainted 4.18.0-rc4-next-20180712+ #5
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor1   D19736 16485  16484 0x00000000
Call Trace:
 context_switch kernel/sched/core.c:2853 [inline]
 __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501
 schedule+0xfb/0x450 kernel/sched/core.c:3545
 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline]
 rwsem_down_read_failed+0x362/0x600 kernel/locking/rwsem-xadd.c:286
 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 __down_read arch/x86/include/asm/rwsem.h:83 [inline]
 __percpu_down_read+0x1a0/0x290 kernel/locking/percpu-rwsem.c:86
 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:49 [inline]
 percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
 __sb_start_write+0x2d7/0x300 fs/super.c:1512
 sb_start_write include/linux/fs.h:1585 [inline]
 mnt_want_write+0x3f/0xc0 fs/namespace.c:364
 do_unlinkat+0x2b7/0xa30 fs/namei.c:4086
 __do_sys_unlink fs/namei.c:4151 [inline]
 __se_sys_unlink fs/namei.c:4149 [inline]
 __x64_sys_unlink+0x42/0x50 fs/namei.c:4149
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455b77
Code: c0 48 89 44 24 30 48 8b 2c 24 48 83 c4 08 c3 89 74 24 28 48 83 c0 02 48 89 44 24 30 48 8b 2c 24 48 83 c4 08 c3 8d 7e 20 40 80 <ff> 10 73 64 48 83 fa 02 7e c2 0f b6 54 0b 01 8d 7a 80 40 80 ff 3f 
RSP: 002b:00007fff7a8b11e8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000455b77
RDX: 00007fff7a8b11f0 RSI: 00007fff7a8b1280 RDI: 00007fff7a8b1280
RBP: 00007fff7a8b2f90 R08: 0000000000000000 R09: 000000000000000d
R10: 0000000000000006 R11: 0000000000000206 R12: 0000000000df1940
R13: 0000000000000000 R14: 00007fff7a8b2960 R15: 0000000000702140
percpu_rw_semaphore(00000000585a150e)
  ->rw_sem.count=0xfffffffe00000001
  ->rss.gp_state=2
  ->rss.gp_count=1
  ->rss.cb_state=0
  ->rss.gp_type=1
  ->readers_block=1
  ->read_count=0
  ->list_empty(rw_sem.wait_list)=0
  ->writer.task=          (null)
INFO: task syz-executor4:27881 blocked for more than 140 seconds.
      Not tainted 4.18.0-rc4-next-20180712+ #5
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor4   D25040 27881   4490 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2853 [inline]
 __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501
 schedule+0xfb/0x450 kernel/sched/core.c:3545
 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline]
 rwsem_down_read_failed+0x362/0x600 kernel/locking/rwsem-xadd.c:286
 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 __down_read arch/x86/include/asm/rwsem.h:83 [inline]
 __percpu_down_read+0x1a0/0x290 kernel/locking/percpu-rwsem.c:86
 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:49 [inline]
 percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
 __sb_start_write+0x2d7/0x300 fs/super.c:1512
 sb_start_pagefault include/linux/fs.h:1614 [inline]
 ext4_page_mkwrite+0x1d0/0x1430 fs/ext4/inode.c:6125
 do_page_mkwrite+0x14e/0x520 mm/memory.c:2374
 wp_page_shared mm/memory.c:2670 [inline]
 do_wp_page+0xf78/0x19b0 mm/memory.c:2770
 handle_pte_fault mm/memory.c:3983 [inline]
 __handle_mm_fault+0x2abf/0x44a0 mm/memory.c:4091
 handle_mm_fault+0x53e/0xc80 mm/memory.c:4128
 __do_page_fault+0x620/0xe50 arch/x86/mm/fault.c:1397
 do_page_fault+0xf6/0x8c0 arch/x86/mm/fault.c:1472
 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1164
RIP: 0033:0x4084b0
Code: 24 1f e9 d2 00 00 00 48 ff c2 48 83 fa 08 0f 83 ad 00 00 00 84 01 0f b6 1c 11 38 d8 75 e9 48 89 54 24 20 48 8b 5c 24 48 0f b6 <73> 50 48 0f af f2 0f b6 5b 51 48 89 cf 48 8d 74 3e 08 84 db 74 7c 
RSP: 002b:00007ffe20c4f320 EFLAGS: 00010287
RAX: 0000001b2bf20b50 RBX: 0000000000000000 RCX: 0000001b2cf20000
RDX: 0000001b2bf20b54 RSI: 0000000000000003 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffe20c4f360 R11: 0000000000000246 R12: 0000000000000009
R13: 0000000000000002 R14: 000000000072bf48 R15: 000000000072bf48
percpu_rw_semaphore(00000000600dfe4f)
  ->rw_sem.count=0xfffffffe00000001
  ->rss.gp_state=2
  ->rss.gp_count=1
  ->rss.cb_state=0
  ->rss.gp_type=1
  ->readers_block=1
  ->read_count=0
  ->list_empty(rw_sem.wait_list)=0
  ->writer.task=          (null)
INFO: task syz-executor3:27929 blocked for more than 140 seconds.
      Not tainted 4.18.0-rc4-next-20180712+ #5
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor3   D24904 27929   4493 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2853 [inline]
 __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501
 schedule+0xfb/0x450 kernel/sched/core.c:3545
 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline]
 rwsem_down_read_failed+0x362/0x600 kernel/locking/rwsem-xadd.c:286
 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 __down_read arch/x86/include/asm/rwsem.h:83 [inline]
 __percpu_down_read+0x1a0/0x290 kernel/locking/percpu-rwsem.c:86
 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:49 [inline]
 percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
 __sb_start_write+0x2d7/0x300 fs/super.c:1512
 sb_start_pagefault include/linux/fs.h:1614 [inline]
 ext4_page_mkwrite+0x1d0/0x1430 fs/ext4/inode.c:6125
 do_page_mkwrite+0x14e/0x520 mm/memory.c:2374
 wp_page_shared mm/memory.c:2670 [inline]
 do_wp_page+0xf78/0x19b0 mm/memory.c:2770
 handle_pte_fault mm/memory.c:3983 [inline]
 __handle_mm_fault+0x2abf/0x44a0 mm/memory.c:4091
 handle_mm_fault+0x53e/0xc80 mm/memory.c:4128
 __do_page_fault+0x620/0xe50 arch/x86/mm/fault.c:1397
 do_page_fault+0xf6/0x8c0 arch/x86/mm/fault.c:1472
 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1164
RIP: 0033:0x4084b0
Code: 24 1f e9 d2 00 00 00 48 ff c2 48 83 fa 08 0f 83 ad 00 00 00 84 01 0f b6 1c 11 38 d8 75 e9 48 89 54 24 20 48 8b 5c 24 48 0f b6 <73> 50 48 0f af f2 0f b6 5b 51 48 89 cf 48 8d 74 3e 08 84 db 74 7c 
RSP: 002b:00007ffcf718d5d0 EFLAGS: 00010287
RAX: 0000001b2c121d6c RBX: 0000000000000000 RCX: 0000001b2d120000
RDX: 0000001b2c121d70 RSI: 0000000000000006 RDI: 0000000000000006
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffcf718d610 R11: 0000000000000000 R12: 0000000000000002
R13: 0000000000000002 R14: 000000000072bea0 R15: 000000000072bea0
percpu_rw_semaphore(00000000600dfe4f)
  ->rw_sem.count=0xfffffffe00000001
  ->rss.gp_state=2
  ->rss.gp_count=1
  ->rss.cb_state=0
  ->rss.gp_type=1
  ->readers_block=1
  ->read_count=0
  ->list_empty(rw_sem.wait_list)=0
  ->writer.task=          (null)
INFO: task syz-executor5:27928 blocked for more than 140 seconds.
      Not tainted 4.18.0-rc4-next-20180712+ #5
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor5   D24904 27928   4494 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2853 [inline]
 __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501
 schedule+0xfb/0x450 kernel/sched/core.c:3545
 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline]
 rwsem_down_read_failed+0x362/0x600 kernel/locking/rwsem-xadd.c:286
 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 __down_read arch/x86/include/asm/rwsem.h:83 [inline]
 __percpu_down_read+0x1a0/0x290 kernel/locking/percpu-rwsem.c:86
 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:49 [inline]
 percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
 __sb_start_write+0x2d7/0x300 fs/super.c:1512
 sb_start_pagefault include/linux/fs.h:1614 [inline]
 ext4_page_mkwrite+0x1d0/0x1430 fs/ext4/inode.c:6125
 do_page_mkwrite+0x14e/0x520 mm/memory.c:2374
 wp_page_shared mm/memory.c:2670 [inline]
 do_wp_page+0xf78/0x19b0 mm/memory.c:2770
 handle_pte_fault mm/memory.c:3983 [inline]
 __handle_mm_fault+0x2abf/0x44a0 mm/memory.c:4091
 handle_mm_fault+0x53e/0xc80 mm/memory.c:4128
 __do_page_fault+0x620/0xe50 arch/x86/mm/fault.c:1397
 do_page_fault+0xf6/0x8c0 arch/x86/mm/fault.c:1472
 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1164
RIP: 0033:0x4084b0
Code: 24 1f e9 d2 00 00 00 48 ff c2 48 83 fa 08 0f 83 ad 00 00 00 84 01 0f b6 1c 11 38 d8 75 e9 48 89 54 24 20 48 8b 5c 24 48 0f b6 <73> 50 48 0f af f2 0f b6 5b 51 48 89 cf 48 8d 74 3e 08 84 db 74 7c 
RSP: 002b:00007ffe09e75d00 EFLAGS: 00010287
RAX: 0000001b2c221674 RBX: 0000000000000000 RCX: 0000001b2d220000
RDX: 0000001b2c221678 RSI: 0000000000730a50 RDI: 0000000000000002
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffe09e75d40 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000002 R14: 000000000072bea0 R15: 000000000072bea0
percpu_rw_semaphore(00000000600dfe4f)
  ->rw_sem.count=0xfffffffe00000001
  ->rss.gp_state=2
  ->rss.gp_count=1
  ->rss.cb_state=0
  ->rss.gp_type=1
  ->readers_block=1
  ->read_count=0
  ->list_empty(rw_sem.wait_list)=0
  ->writer.task=          (null)
INFO: task syz-executor2:27931 blocked for more than 140 seconds.
      Not tainted 4.18.0-rc4-next-20180712+ #5
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor2   D24816 27931   4492 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2853 [inline]
 __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501
 schedule+0xfb/0x450 kernel/sched/core.c:3545
 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline]
 rwsem_down_read_failed+0x362/0x600 kernel/locking/rwsem-xadd.c:286
 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 __down_read arch/x86/include/asm/rwsem.h:83 [inline]
 __percpu_down_read+0x1a0/0x290 kernel/locking/percpu-rwsem.c:86
 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:49 [inline]
 percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
 __sb_start_write+0x2d7/0x300 fs/super.c:1512
 sb_start_pagefault include/linux/fs.h:1614 [inline]
 ext4_page_mkwrite+0x1d0/0x1430 fs/ext4/inode.c:6125
 do_page_mkwrite+0x14e/0x520 mm/memory.c:2374
 wp_page_shared mm/memory.c:2670 [inline]
 do_wp_page+0xf78/0x19b0 mm/memory.c:2770
 handle_pte_fault mm/memory.c:3983 [inline]
 __handle_mm_fault+0x2abf/0x44a0 mm/memory.c:4091
 handle_mm_fault+0x53e/0xc80 mm/memory.c:4128
 __do_page_fault+0x620/0xe50 arch/x86/mm/fault.c:1397
 do_page_fault+0xf6/0x8c0 arch/x86/mm/fault.c:1472
 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1164
RIP: 0033:0x4084b0
Code: 24 1f e9 d2 00 00 00 48 ff c2 48 83 fa 08 0f 83 ad 00 00 00 84 01 0f b6 1c 11 38 d8 75 e9 48 89 54 24 20 48 8b 5c 24 48 0f b6 <73> 50 48 0f af f2 0f b6 5b 51 48 89 cf 48 8d 74 3e 08 84 db 74 7c 
RSP: 002b:00007ffcb76a1820 EFLAGS: 00010287
RAX: 0000001b2be2380c RBX: 0000000000000000 RCX: 0000001b2ce20000
RDX: 0000001b2be23810 RSI: 0000000000730380 RDI: 0000000000000004
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffcb76a1860 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000002 R14: 000000000072bea0 R15: 000000000072bea0
percpu_rw_semaphore(00000000600dfe4f)
  ->rw_sem.count=0xfffffffe00000001
  ->rss.gp_state=2
  ->rss.gp_count=1
  ->rss.cb_state=0
  ->rss.gp_type=1
  ->readers_block=1
  ->read_count=0
  ->list_empty(rw_sem.wait_list)=0
  ->writer.task=          (null)
INFO: task syz-executor0:27935 blocked for more than 140 seconds.
      Not tainted 4.18.0-rc4-next-20180712+ #5
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D25056 27935   4489 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:2853 [inline]
 __schedule+0x87c/0x1ed0 kernel/sched/core.c:3501
 schedule+0xfb/0x450 kernel/sched/core.c:3545
 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline]
 rwsem_down_read_failed+0x362/0x600 kernel/locking/rwsem-xadd.c:286
 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94
 __down_read arch/x86/include/asm/rwsem.h:83 [inline]
 __percpu_down_read+0x1a0/0x290 kernel/locking/percpu-rwsem.c:86
 percpu_down_read_preempt_disable include/linux/percpu-rwsem.h:49 [inline]
 percpu_down_read include/linux/percpu-rwsem.h:59 [inline]
 __sb_start_write+0x2d7/0x300 fs/super.c:1512
 sb_start_pagefault include/linux/fs.h:1614 [inline]
 ext4_page_mkwrite+0x1d0/0x1430 fs/ext4/inode.c:6125
 do_page_mkwrite+0x14e/0x520 mm/memory.c:2374
 do_shared_fault mm/memory.c:3701 [inline]
 do_fault mm/memory.c:3740 [inline]
 handle_pte_fault mm/memory.c:3967 [inline]
 __handle_mm_fault+0x2b98/0x44a0 mm/memory.c:4091
 handle_mm_fault+0x53e/0xc80 mm/memory.c:4128
 __do_page_fault+0x620/0xe50 arch/x86/mm/fault.c:1397
 do_page_fault+0xf6/0x8c0 arch/x86/mm/fault.c:1472
 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1164
RIP: 0033:0x4084b0
Code: 24 1f e9 d2 00 00 00 48 ff c2 48 83 fa 08 0f 83 ad 00 00 00 84 01 0f b6 1c 11 38 d8 75 e9 48 89 54 24 20 48 8b 5c 24 48 0f b6 <73> 50 48 0f af f2 0f b6 5b 51 48 89 cf 48 8d 74 3e 08 84 db 74 7c 
RSP: 002b:00007ffe9d130000 EFLAGS: 00010287
RAX: 0000001b2bd22000 RBX: 0000000006302047 RCX: 0000001b2cd20000
RDX: 0000001b2bd22004 RSI: 0000000000001a64 RDI: 00000000f6623a64
RBP: 0000000000000311 R08: 00000000f6623a68 R09: 0000000000000000
R10: 00007ffe9d130090 R11: 0000000000000246 R12: 000000000072bea0
R13: 00007ff1de690004 R14: 00007ff1de690000 R15: 0000000000002bcd
percpu_rw_semaphore(00000000600dfe4f)
  ->rw_sem.count=0xfffffffe00000001
  ->rss.gp_state=2
  ->rss.gp_count=1
  ->rss.cb_state=0
  ->rss.gp_type=1
  ->readers_block=1
  ->read_count=0
  ->list_empty(rw_sem.wait_list)=0
  ->writer.task=          (null)
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 PID: 901 Comm: khungtaskd Not tainted 4.18.0-rc4-next-20180712+ #5
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold.3+0x48/0x88 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x151/0x192 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:144 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:231 [inline]
 watchdog+0xb81/0x10f0 kernel/hung_task.c:292
 kthread+0x345/0x410 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54