INFO: task rs:main Q:Reg:4394 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. rs:main Q:Reg D22448 4394 1 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 file_start_write include/linux/fs.h:2782 [inline] vfs_write+0x42a/0x560 fs/read_write.c:548 ksys_write+0x101/0x260 fs/read_write.c:598 __do_sys_write fs/read_write.c:610 [inline] __se_sys_write fs/read_write.c:607 [inline] __x64_sys_write+0x73/0xb0 fs/read_write.c:607 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7fcb1aa7b19d Code: Bad RIP value. RSP: 002b:00007fcb1901c000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000000014d RCX: 00007fcb1aa7b19d RDX: 000000000000014d RSI: 0000000001369a90 RDI: 0000000000000005 RBP: 0000000001369a90 R08: 0000000001369b84 R09: 00007fcb1a3f89d7 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 00007fcb1901c480 R14: 0000000000000003 R15: 0000000001369890 percpu_rw_semaphore(00000000d9df82f9) ->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:4512 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 D19984 4512 4508 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:000000c42756b538 EFLAGS: 00010212 RAX: 000000c42756b878 RBX: 000000c42756b880 RCX: 00007f23cd179000 RDX: 0000000000000745 RSI: 0000000000000000 RDI: 0000000000000360 RBP: 000000c42756b548 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000095bb32 R11: 0000000000000004 R12: 0000000000000000 R13: 0000000000000020 R14: 0000000000000013 R15: 0000000000000002 percpu_rw_semaphore(00000000082ac9da) ->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:9955 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 D20928 9955 4508 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:000000c42b017538 EFLAGS: 00010212 RAX: 000000c42b017878 RBX: 000000c42b017880 RCX: 00007f23c9b79000 RDX: 0000000000000745 RSI: 0000000000000000 RDI: 0000000000000020 RBP: 000000c42b017548 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000095bb32 R11: 0000000000000004 R12: 0000000000000000 R13: 0000000000000020 R14: 0000000000000013 R15: 000000c42b0179f8 percpu_rw_semaphore(00000000082ac9da) ->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-executor1:4538 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 4538 4530 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:00007ffd95b6fc48 EFLAGS: 00000206 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000455b77 RDX: 00007ffd95b6fc50 RSI: 00007ffd95b6fce0 RDI: 00007ffd95b6fce0 RBP: 00007ffd95b719f0 R08: 0000000000000000 R09: 0000000000000011 R10: 000000000000000a R11: 0000000000000206 R12: 0000000002846940 R13: 0000000000000000 R14: 00007ffd95b713c0 R15: 0000000000702140 percpu_rw_semaphore(00000000d9df82f9) ->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-executor4:4541 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 D21232 4541 4532 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:00007ffff45f15b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007ffff45f15e0 RCX: 0000000000455267 RDX: 00007ffff45f2296 RSI: 00000000000001ff RDI: 00007ffff45f2290 RBP: 0000000000000013 R08: 0000000000000000 R09: 0000000000000006 R10: 0000000000000064 R11: 0000000000000206 R12: 0000000000000000 R13: 0000000000001380 R14: 00007ffff45f1c60 R15: 00000000007034c0 percpu_rw_semaphore(00000000d9df82f9) ->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-executor2:1134 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 D21232 1134 1133 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:00007ffdac9cb1d8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000455b77 RDX: 00007ffdac9cb1e0 RSI: 00007ffdac9cb270 RDI: 00007ffdac9cb270 RBP: 00007ffdac9ccf80 R08: 0000000000000000 R09: 0000000000000011 R10: 000000000000000a R11: 0000000000000206 R12: 0000000000c57940 R13: 0000000000000000 R14: 00007ffdac9cc950 R15: 0000000000702140 percpu_rw_semaphore(00000000d9df82f9) ->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-executor3:4018 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 D21232 4018 4017 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:00007fff87c98d78 EFLAGS: 00000206 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000455b77 RDX: 00007fff87c98d80 RSI: 00007fff87c98e10 RDI: 00007fff87c98e10 RBP: 00007fff87c9ab20 R08: 0000000000000000 R09: 0000000000000011 R10: 000000000000000a R11: 0000000000000206 R12: 0000000001c93940 R13: 0000000000000000 R14: 00007fff87c9a4f0 R15: 0000000000702140 percpu_rw_semaphore(00000000d9df82f9) ->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-executor6:19633 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 D24904 19633 4535 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 2e 23 40 00 00 00 00 00 3e 23 40 00 00 00 00 00 4e 23 40 00 00 00 00 00 5e 23 40 00 00 00 00 00 6e 23 40 00 00 00 00 00 <7e> 23 40 00 00 00 00 00 8e 23 40 00 00 00 00 00 9e 23 40 00 00 00 RSP: 002b:00007ffdb9fbab80 EFLAGS: 00010287 RAX: 0000001b2ed2146c RBX: 0000000000000000 RCX: 0000001b2fd20000 RDX: 0000001b2ed21470 RSI: 0000000000000003 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 00007ffdb9fbabc0 R11: 0000000000000000 R12: 0000000000000075 R13: 0000000000000002 R14: 000000000072bea0 R15: 000000000072bea0 percpu_rw_semaphore(00000000082ac9da) ->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-executor7:19634 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 D25056 19634 4539 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 2e 23 40 00 00 00 00 00 3e 23 40 00 00 00 00 00 4e 23 40 00 00 00 00 00 5e 23 40 00 00 00 00 00 6e 23 40 00 00 00 00 00 <7e> 23 40 00 00 00 00 00 8e 23 40 00 00 00 00 00 9e 23 40 00 00 00 RSP: 002b:00007ffcf482d3e0 EFLAGS: 00010287 RAX: 0000001b2ef2129c RBX: 0000000000000000 RCX: 0000001b2ff20000 RDX: 0000001b2ef212a0 RSI: 0000000000730180 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 00007ffcf482d420 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000002 R14: 000000000072bea0 R15: 000000000072bea0 percpu_rw_semaphore(00000000082ac9da) ->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-executor5:19638 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 D24904 19638 4540 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 2e 23 40 00 00 00 00 00 3e 23 40 00 00 00 00 00 4e 23 40 00 00 00 00 00 5e 23 40 00 00 00 00 00 6e 23 40 00 00 00 00 00 <7e> 23 40 00 00 00 00 00 8e 23 40 00 00 00 00 00 9e 23 40 00 00 00 RSP: 002b:00007ffd4fa13540 EFLAGS: 00010287 RAX: 0000001b2f1212f0 RBX: 0000000000000000 RCX: 0000001b30120000 RDX: 0000001b2f1212f4 RSI: 0000000000730998 RDI: 0000000000000002 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 00007ffd4fa13580 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000002 R14: 000000000072bea0 R15: 000000000072bea0 percpu_rw_semaphore(00000000082ac9da) ->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 0 CPU: 0 PID: 901 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 0 to CPUs 1: NMI backtrace for cpu 1 skipped: idling at native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54