INFO: task syz-fuzzer:4441 blocked for more than 140 seconds.
      Not tainted 4.18.0-rc4-next-20180711+ #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-fuzzer      D19312  4441   4435 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_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+0xf5c/0x1670 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: 0033:0x70b5e1
Code: Bad RIP value.
RSP: 002b:000000c42a3fc710 EFLAGS: 00010212
RAX: 000000c42a3fca50 RBX: 000000c42a3fca58 RCX: 00007ff58a8de000
RDX: 0000000000000756 RSI: 0000000000000000 RDI: 00000000000002e8
RBP: 000000c42a3fc720 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000095bb32 R11: 0000000000000004 R12: 0000000000000000
R13: 0000000000000020 R14: 0000000000000013 R15: 000000c42a3fcbc0
percpu_rw_semaphore(000000008fad307d)
  ->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-fuzzer:4442 blocked for more than 140 seconds.
      Not tainted 4.18.0-rc4-next-20180711+ #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-fuzzer      D19312  4442   4435 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_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+0xf5c/0x1670 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: 0033:0x70b5e1
Code: Bad RIP value.
RSP: 002b:000000c420130c50 EFLAGS: 00010212
RAX: 000000c420131288 RBX: 000000c420131290 RCX: 00007ff5914de000
RDX: fffffffffffffffe RSI: 0000000002098018 RDI: 000000c420130c60
RBP: 000000c420130c60 R08: 0000000000000000 R09: 0000000000000000
R10: 000000000095bb32 R11: 0000000000000004 R12: 0000000000000000
R13: 0000000000000020 R14: 0000000000000013 R15: 000000c422381458
percpu_rw_semaphore(000000008fad307d)
  ->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-executor7:4463 blocked for more than 140 seconds.
      Not tainted 4.18.0-rc4-next-20180711+ #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor7   D21232  4463   4457 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: Bad RIP value.
RSP: 002b:00007ffef09b2ab8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000455b77
RDX: 00007ffef09b2ac0 RSI: 00007ffef09b2b50 RDI: 00007ffef09b2b50
RBP: 00007ffef09b4860 R08: 0000000000000000 R09: 0000000000000010
R10: 000000000000000a R11: 0000000000000206 R12: 0000000001ae0940
R13: 0000000000000000 R14: 00007ffef09b4230 R15: 0000000000702140
percpu_rw_semaphore(0000000048fee230)
  ->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-executor0:4464 blocked for more than 140 seconds.
      Not tainted 4.18.0-rc4-next-20180711+ #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor0   D21352  4464   4455 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
 filename_create+0x13e/0x5b0 fs/namei.c:3671
 user_path_create fs/namei.c:3734 [inline]
 do_mkdirat+0xda/0x310 fs/namei.c:3873
 __do_sys_mkdir fs/namei.c:3897 [inline]
 __se_sys_mkdir fs/namei.c:3895 [inline]
 __x64_sys_mkdir+0x5c/0x80 fs/namei.c:3895
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455267
Code: Bad RIP value.
RSP: 002b:00007ffe51fd0088 EFLAGS: 00000206 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 00007ffe51fd00b0 RCX: 0000000000455267
RDX: 00007ffe51fd0d65 RSI: 00000000000001ff RDI: 00007ffe51fd0d60
RBP: 0000000000000013 R08: 0000000000000000 R09: 0000000000000005
R10: 0000000000000064 R11: 0000000000000206 R12: 0000000000000000
R13: 0000000000001380 R14: 00007ffe51fd0730 R15: 00000000007034c0
percpu_rw_semaphore(0000000048fee230)
  ->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-executor1:4470 blocked for more than 140 seconds.
      Not tainted 4.18.0-rc4-next-20180711+ #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor1   D21232  4470   4462 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: Bad RIP value.
RSP: 002b:00007ffeff63e9c8 EFLAGS: 00000202 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000455b77
RDX: 00007ffeff63e9d0 RSI: 00007ffeff63ea60 RDI: 00007ffeff63ea60
RBP: 00007ffeff640770 R08: 0000000000000000 R09: 0000000000000010
R10: 000000000000000a R11: 0000000000000202 R12: 000000000239a940
R13: 0000000000000000 R14: 00007ffeff640140 R15: 0000000000702140
percpu_rw_semaphore(0000000048fee230)
  ->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-executor4:28724 blocked for more than 140 seconds.
      Not tainted 4.18.0-rc4-next-20180711+ #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor4   D24816 28724   4465 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+0xf5c/0x1670 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: 00 00 48 8b 44 24 50 4c 89 54 24 30 41 bf 08 07 00 00 48 89 04 24 48 8b 44 24 58 48 89 44 24 08 48 8b 44 24 60 48 89 44 24 10 <48> 8b 44 24 68 48 89 44 24 18 48 8b 44 24 70 48 89 44 24 20 e8 37 
RSP: 002b:00007fffcf4f1d50 EFLAGS: 00010283
RAX: 0000001b32721a7c RBX: 0000000000000000 RCX: 0000001b33720000
RDX: 0000001b32721a80 RSI: 0000000000000005 RDI: 0000000000000005
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 00007fffcf4f1d90 R11: 0000000000000246 R12: 0000000000000009
R13: 0000000000000002 R14: 000000000072bf48 R15: 000000000072bf48
percpu_rw_semaphore(000000008fad307d)
  ->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-executor2:28753 blocked for more than 140 seconds.
      Not tainted 4.18.0-rc4-next-20180711+ #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor2   D25016 28753   4466 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_write include/linux/fs.h:1585 [inline]
 mnt_want_write+0x3f/0xc0 fs/namespace.c:364
 filename_create+0x13e/0x5b0 fs/namei.c:3671
 user_path_create fs/namei.c:3734 [inline]
 do_mkdirat+0xda/0x310 fs/namei.c:3873
 __do_sys_mkdir fs/namei.c:3897 [inline]
 __se_sys_mkdir fs/namei.c:3895 [inline]
 __x64_sys_mkdir+0x5c/0x80 fs/namei.c:3895
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x455267
Code: Bad RIP value.
RSP: 002b:00007fa2c816aa88 EFLAGS: 00000246 ORIG_RAX: 0000000000000053
RAX: ffffffffffffffda RBX: 0000000020000228 RCX: 0000000000455267
RDX: 0000000000000015 RSI: 00000000000001ff RDI: 0000000020000100
RBP: 0000000000000001 R08: 0000000000000000 R09: 000000000000000a
R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000015
R13: 0000000000000001 R14: 00000000004d3fb8 R15: 0000000000000001
percpu_rw_semaphore(0000000048fee230)
  ->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-executor6:28742 blocked for more than 140 seconds.
      Not tainted 4.18.0-rc4-next-20180711+ #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor6   D23432 28742   4468 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+0xf5c/0x1670 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: 00 00 48 8b 44 24 50 4c 89 54 24 30 41 bf 08 07 00 00 48 89 04 24 48 8b 44 24 58 48 89 44 24 08 48 8b 44 24 60 48 89 44 24 10 <48> 8b 44 24 68 48 89 44 24 18 48 8b 44 24 70 48 89 44 24 20 e8 37 
RSP: 002b:00007ffcba479990 EFLAGS: 00010283
RAX: 0000001b32922480 RBX: 0000000000000000 RCX: 0000001b33920000
RDX: 0000001b32922484 RSI: 0000000000000006 RDI: 0000000000000006
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffcba4799d0 R11: 0000000000000246 R12: 0000000000000009
R13: 0000000000000002 R14: 000000000072bf48 R15: 000000000072bf48
percpu_rw_semaphore(000000008fad307d)
  ->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-executor3:28754 blocked for more than 140 seconds.
      Not tainted 4.18.0-rc4-next-20180711+ #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor3   D24904 28754   4467 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+0xf5c/0x1670 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: 00 00 48 8b 44 24 50 4c 89 54 24 30 41 bf 08 07 00 00 48 89 04 24 48 8b 44 24 58 48 89 44 24 08 48 8b 44 24 60 48 89 44 24 10 <48> 8b 44 24 68 48 89 44 24 18 48 8b 44 24 70 48 89 44 24 20 e8 37 
RSP: 002b:00007ffcdde16ce0 EFLAGS: 00010283
RAX: 0000001b326216c8 RBX: 0000000000000000 RCX: 0000001b33620000
RDX: 0000001b326216cc RSI: 0000000000730288 RDI: 0000000000000001
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffcdde16d20 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000002 R14: 000000000072bea0 R15: 000000000072bea0
percpu_rw_semaphore(000000008fad307d)
  ->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-executor5:28756 blocked for more than 140 seconds.
      Not tainted 4.18.0-rc4-next-20180711+ #4
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor5   D24720 28756  25475 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+0xf5c/0x1670 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: 00 00 48 8b 44 24 50 4c 89 54 24 30 41 bf 08 07 00 00 48 89 04 24 48 8b 44 24 58 48 89 44 24 08 48 8b 44 24 60 48 89 44 24 10 <48> 8b 44 24 68 48 89 44 24 18 48 8b 44 24 70 48 89 44 24 20 e8 37 
RSP: 002b:00007ffc94fd92b0 EFLAGS: 00010283
RAX: 0000001b32020004 RBX: 0000000000000000 RCX: 0000001b33020000
RDX: 0000001b32020008 RSI: 00000000007300b0 RDI: 0000000000000000
RBP: 0000000000000000 R08: 00007ffc94fd0000 R09: 0000000000000000
R10: 00007ffc94fd92f0 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000002 R14: 000000000072bea0 R15: 000000000072bea0
percpu_rw_semaphore(000000008fad307d)
  ->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: 899 Comm: khungtaskd Not tainted 4.18.0-rc4-next-20180711+ #4
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
CPU: 0 PID: 2419 Comm: udevd Not tainted 4.18.0-rc4-next-20180711+ #4
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__lock_acquire+0x20b/0x5020 kernel/locking/lockdep.c:3294
Code: 03 8c 24 90 00 00 00 48 8d 79 08 48 c7 01 00 00 00 00 48 83 e7 f8 48 c7 41 4c 00 00 00 00 48 29 f9 83 c1 54 c1 e9 03 f3 48 ab <44> 89 f8 48 8b b4 24 58 03 00 00 65 48 33 34 25 28 00 00 00 0f 85 
RSP: 0018:ffff8801ca0a7180 EFLAGS: 00000006
RAX: 0000000000000000 RBX: 1ffff10039414ead RCX: 0000000000000000
RDX: 0000000000000004 RSI: 0000000000000000 RDI: ffffed0039414e98
RBP: ffff8801ca0a7510 R08: 0000000000000001 R09: 0000000000000001
R10: ffffed00398671af R11: ffff8801cc338d7f R12: 0000000000000001
R13: ffff8801c9c055d8 R14: ffff8801ca09a500 R15: 0000000000000000
FS:  00007fc0f4fe27a0(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000c96038 CR3: 00000001ca7c2000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 lock_acquire+0x1e4/0x540 kernel/locking/lockdep.c:3924
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline]
 _raw_spin_lock_irqsave+0x96/0xc0 kernel/locking/spinlock.c:152
 ep_scan_ready_list+0x3d3/0xf50 fs/eventpoll.c:701
 ep_send_events fs/eventpoll.c:1706 [inline]
 ep_poll+0x3ef/0x1210 fs/eventpoll.c:1832
 do_epoll_wait+0x1b0/0x200 fs/eventpoll.c:2190
 __do_sys_epoll_wait fs/eventpoll.c:2200 [inline]
 __se_sys_epoll_wait fs/eventpoll.c:2197 [inline]
 __x64_sys_epoll_wait+0x97/0xf0 fs/eventpoll.c:2197
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fc0f46f6943
Code: 00 31 d2 48 29 c2 64 89 11 48 83 c8 ff eb ea 90 90 90 90 90 90 90 90 83 3d b5 dc 2a 00 00 75 13 49 89 ca b8 e8 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 34 c3 48 83 ec 08 e8 3b c4 00 00 48 89 04 24 
RSP: 002b:00007ffc62f3e188 EFLAGS: 00000246 ORIG_RAX: 00000000000000e8
RAX: ffffffffffffffda RBX: 0000000000000bb8 RCX: 00007fc0f46f6943
RDX: 0000000000000008 RSI: 00007ffc62f3e280 RDI: 000000000000000a
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000bb8 R11: 0000000000000246 R12: 0000000000000003
R13: 0000000000000000 R14: 00000000017e13b0 R15: 00000000017dd250