INFO: task syz-fuzzer:4440 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 4440 4438 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: 48 89 6c 24 10 48 8d 6c 24 10 48 8b 44 24 20 48 8b 48 08 48 8b 50 10 48 8d 58 08 48 83 fa 08 0f 8c 1e 01 00 00 48 8b 54 24 28 <88> 11 48 8b 48 08 48 8b 70 10 48 83 fe 01 0f 86 44 01 00 00 48 89 RSP: 002b:000000c429458a40 EFLAGS: 00010212 RAX: 000000c429458d80 RBX: 000000c429458d88 RCX: 00007fcb71744000 RDX: 0000000000000745 RSI: 0000000000000000 RDI: 00000000000007d0 RBP: 000000c429458a50 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000095bb32 R11: 0000000000000004 R12: 0000000000000000 R13: 0000000000000020 R14: 0000000000000013 R15: 000000c429458ef0 percpu_rw_semaphore(000000008af3e9aa) ->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:4445 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 D20320 4445 4438 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: 48 89 6c 24 10 48 8d 6c 24 10 48 8b 44 24 20 48 8b 48 08 48 8b 50 10 48 8d 58 08 48 83 fa 08 0f 8c 1e 01 00 00 48 8b 54 24 28 <88> 11 48 8b 48 08 48 8b 70 10 48 83 fe 01 0f 86 44 01 00 00 48 89 RSP: 002b:000000c42aeecb88 EFLAGS: 00010212 RAX: 000000c42aeed2d0 RBX: 000000c42aeed2d8 RCX: 00007fcb6f344000 RDX: fffffffffffffffe RSI: 0000000001f5c738 RDI: 000000c42aeecb98 RBP: 000000c42aeecb98 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000095bb32 R11: 0000000000000004 R12: 0000000000000000 R13: 0000000000000020 R14: 0000000000000013 R15: 000000c42aeed448 percpu_rw_semaphore(000000008af3e9aa) ->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 D19736 4464 4456 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 10 73 64 48 83 fa 02 7e c2 0f b6 54 0b 01 8d 7a 80 40 80 ff 3f RSP: 002b:00007ffc7065d768 EFLAGS: 00000202 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000455b77 RDX: 00007ffc7065d770 RSI: 00007ffc7065d800 RDI: 00007ffc7065d800 RBP: 00007ffc7065f510 R08: 0000000000000000 R09: 0000000000000011 R10: 000000000000000a R11: 0000000000000202 R12: 0000000001e48940 R13: 0000000000000000 R14: 00007ffc7065eee0 R15: 0000000000702140 percpu_rw_semaphore(000000001d527fd5) ->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-executor7:4468 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 D19736 4468 4459 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 10 73 64 48 83 fa 02 7e c2 0f b6 54 0b 01 8d 7a 80 40 80 ff 3f RSP: 002b:00007ffcd9267588 EFLAGS: 00000206 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000455b77 RDX: 00007ffcd9267590 RSI: 00007ffcd9267620 RDI: 00007ffcd9267620 RBP: 00007ffcd9269330 R08: 0000000000000000 R09: 0000000000000011 R10: 000000000000000a R11: 0000000000000206 R12: 0000000000ca9940 R13: 0000000000000000 R14: 00007ffcd9268d00 R15: 0000000000702140 percpu_rw_semaphore(000000001d527fd5) ->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-executor4:4469 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 D19736 4469 4461 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 10 73 64 48 83 fa 02 7e c2 0f b6 54 0b 01 8d 7a 80 40 80 ff 3f RSP: 002b:00007fffe4e908a8 EFLAGS: 00000202 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000455b77 RDX: 00007fffe4e908b0 RSI: 00007fffe4e90940 RDI: 00007fffe4e90940 RBP: 00007fffe4e92650 R08: 0000000000000000 R09: 0000000000000011 R10: 000000000000000a R11: 0000000000000202 R12: 0000000000f59940 R13: 0000000000000000 R14: 00007fffe4e92020 R15: 0000000000702140 percpu_rw_semaphore(000000001d527fd5) ->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-executor5:4470 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-executor5 D20808 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: 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 10 73 64 48 83 fa 02 7e c2 0f b6 54 0b 01 8d 7a 80 40 80 ff 3f RSP: 002b:00007ffd46c80c68 EFLAGS: 00000202 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000455b77 RDX: 00007ffd46c80c70 RSI: 00007ffd46c80d00 RDI: 00007ffd46c80d00 RBP: 00007ffd46c82a10 R08: 0000000000000000 R09: 0000000000000011 R10: 000000000000000a R11: 0000000000000202 R12: 0000000000d91940 R13: 0000000000000000 R14: 00007ffd46c823e0 R15: 0000000000702140 percpu_rw_semaphore(000000001d527fd5) ->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-executor6:2929 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 D21352 2929 2883 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 10 73 64 48 83 fa 02 7e c2 0f b6 54 0b 01 8d 7a 80 40 80 ff 3f RSP: 002b:00007ffedd30ff08 EFLAGS: 00000202 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000455b77 RDX: 00007ffedd30ff10 RSI: 00007ffedd30ffa0 RDI: 00007ffedd30ffa0 RBP: 00007ffedd311cb0 R08: 0000000000000000 R09: 0000000000000011 R10: 000000000000000a R11: 0000000000000202 R12: 0000000001cc6940 R13: 0000000000000000 R14: 00007ffedd311680 R15: 0000000000702140 percpu_rw_semaphore(000000001d527fd5) ->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-executor1:26418 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 D25056 26418 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: 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:00007ffe759775b0 EFLAGS: 00010283 RAX: 0000001b32622558 RBX: 0000000000000000 RCX: 0000001b33620000 RDX: 0000001b3262255c RSI: 0000000000730d68 RDI: 0000000000000008 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 00007ffe759775f0 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000002 R14: 000000000072bea0 R15: 000000000072bea0 percpu_rw_semaphore(000000008af3e9aa) ->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-executor2:26441 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 D25080 26441 4471 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: 00 00 48 8b 4c 24 78 8b 44 01 04 89 44 24 08 48 8b 84 24 c8 00 00 00 48 89 04 24 e8 53 e7 ff ff 48 8b 44 24 10 48 89 84 24 d0 <00> 00 00 48 8b 8c 24 f8 00 00 00 48 8b 54 24 78 8b 4c 0a 04 89 4c RSP: 002b:00007f3b4bf22a88 EFLAGS: 00000246 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 0000000020000150 RCX: 0000000000455267 RDX: 0000000000000013 RSI: 00000000000001ff RDI: 00000000200000c0 RBP: 0000000000000000 R08: 0000000000000000 R09: 000000000000000a R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000013 R13: 0000000000000000 R14: 00000000004d3fd0 R15: 0000000000000000 percpu_rw_semaphore(000000001d527fd5) ->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-executor3:26438 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 26438 19469 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: 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:00007ffc958dab20 EFLAGS: 00010287 RAX: 0000001b31c21284 RBX: 0000000000000000 RCX: 0000001b32c20000 RDX: 0000001b31c21288 RSI: 0000000000730128 RDI: 0000000000000001 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 00007ffc958dab60 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000002 R14: 000000000072bea0 R15: 000000000072bea0 percpu_rw_semaphore(000000008af3e9aa) ->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: 900 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