EXT4-fs (sda1): shut down requested (0) INFO: task rs:main Q:Reg:4185 blocked for more than 140 seconds. Not tainted 4.19.0-rc2-next-20180904+ #55 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. rs:main Q:Reg D17224 4185 1 0x00000000 Call Trace: context_switch kernel/sched/core.c:2825 [inline] __schedule+0x87c/0x1df0 kernel/sched/core.c:3473 schedule+0xfb/0x450 kernel/sched/core.c:3517 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline] rwsem_down_read_failed+0x362/0x610 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+0x16e/0x210 kernel/locking/percpu-rwsem.c:85 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:1515 file_start_write include/linux/fs.h:2786 [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: 0033:0x7fcaec5f219d Code: Bad RIP value. RSP: 002b:00007fcaeab93000 EFLAGS: 00000293 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000059 RCX: 00007fcaec5f219d RDX: 0000000000000059 RSI: 0000000000cada90 RDI: 0000000000000005 RBP: 0000000000cada90 R08: 73662d3454584520 R09: 3a29316164732820 R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 R13: 00007fcaeab93480 R14: 0000000000000001 R15: 0000000000cad890 INFO: task syz-executor7:4327 blocked for more than 140 seconds. Not tainted 4.19.0-rc2-next-20180904+ #55 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor7 D16792 4327 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2825 [inline] __schedule+0x87c/0x1df0 kernel/sched/core.c:3473 schedule+0xfb/0x450 kernel/sched/core.c:3517 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline] rwsem_down_read_failed+0x362/0x610 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+0x16e/0x210 kernel/locking/percpu-rwsem.c:85 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:1515 sb_start_write include/linux/fs.h:1584 [inline] mnt_want_write+0x3f/0xc0 fs/namespace.c:360 do_unlinkat+0x2b7/0xa30 fs/namei.c:4045 __do_sys_unlink fs/namei.c:4110 [inline] __se_sys_unlink fs/namei.c:4108 [inline] __x64_sys_unlink+0x42/0x50 fs/namei.c:4108 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x456de7 Code: 0f 1f 00 b8 58 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 9d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 7d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffdce1a1548 EFLAGS: 00000206 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000456de7 RDX: 00007ffdce1a1560 RSI: 00007ffdce1a15f0 RDI: 00007ffdce1a15f0 RBP: 0000000000002209 R08: 0000000000000000 R09: 0000000000000011 R10: 000000000000000a R11: 0000000000000206 R12: 00007ffdce1a2650 R13: 000000000217c940 R14: 0000000000000000 R15: badc0ffeebadface INFO: task syz-executor6:4329 blocked for more than 140 seconds. Not tainted 4.19.0-rc2-next-20180904+ #55 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor6 D17280 4329 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2825 [inline] __schedule+0x87c/0x1df0 kernel/sched/core.c:3473 schedule+0xfb/0x450 kernel/sched/core.c:3517 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline] rwsem_down_read_failed+0x362/0x610 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+0x16e/0x210 kernel/locking/percpu-rwsem.c:85 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:1515 sb_start_write include/linux/fs.h:1584 [inline] mnt_want_write+0x3f/0xc0 fs/namespace.c:360 do_unlinkat+0x2b7/0xa30 fs/namei.c:4045 __do_sys_unlink fs/namei.c:4110 [inline] __se_sys_unlink fs/namei.c:4108 [inline] __x64_sys_unlink+0x42/0x50 fs/namei.c:4108 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x456de7 Code: 0f 1f 00 b8 58 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 9d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 7d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fff4d249fd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000456de7 RDX: 00007fff4d249ff0 RSI: 00007fff4d24a080 RDI: 00007fff4d24a080 RBP: 000000000000231a R08: 0000000000000000 R09: 0000000000000011 R10: 000000000000000a R11: 0000000000000206 R12: 00007fff4d24b0e0 R13: 00000000020e9940 R14: 0000000000000000 R15: badc0ffeebadface INFO: task syz-executor3:4330 blocked for more than 140 seconds. Not tainted 4.19.0-rc2-next-20180904+ #55 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor3 D17856 4330 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2825 [inline] __schedule+0x87c/0x1df0 kernel/sched/core.c:3473 schedule+0xfb/0x450 kernel/sched/core.c:3517 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline] rwsem_down_read_failed+0x362/0x610 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+0x16e/0x210 kernel/locking/percpu-rwsem.c:85 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:1515 sb_start_write include/linux/fs.h:1584 [inline] mnt_want_write+0x3f/0xc0 fs/namespace.c:360 do_unlinkat+0x2b7/0xa30 fs/namei.c:4045 __do_sys_unlink fs/namei.c:4110 [inline] __se_sys_unlink fs/namei.c:4108 [inline] __x64_sys_unlink+0x42/0x50 fs/namei.c:4108 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x456de7 Code: 0f 1f 00 b8 58 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 9d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 7d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffee4c3ccd8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000456de7 RDX: 00007ffee4c3ccf0 RSI: 00007ffee4c3cd80 RDI: 00007ffee4c3cd80 RBP: 0000000000001f10 R08: 0000000000000000 R09: 0000000000000011 R10: 000000000000000a R11: 0000000000000206 R12: 00007ffee4c3dde0 R13: 0000000002746940 R14: 0000000000000000 R15: badc0ffeebadface INFO: task syz-executor5:4331 blocked for more than 140 seconds. Not tainted 4.19.0-rc2-next-20180904+ #55 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor5 D17104 4331 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2825 [inline] __schedule+0x87c/0x1df0 kernel/sched/core.c:3473 schedule+0xfb/0x450 kernel/sched/core.c:3517 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline] rwsem_down_read_failed+0x362/0x610 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+0x16e/0x210 kernel/locking/percpu-rwsem.c:85 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:1515 sb_start_write include/linux/fs.h:1584 [inline] mnt_want_write+0x3f/0xc0 fs/namespace.c:360 do_unlinkat+0x2b7/0xa30 fs/namei.c:4045 __do_sys_unlink fs/namei.c:4110 [inline] __se_sys_unlink fs/namei.c:4108 [inline] __x64_sys_unlink+0x42/0x50 fs/namei.c:4108 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x456de7 Code: 0f 1f 00 b8 58 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 9d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 7d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007fff1f8ead78 EFLAGS: 00000206 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000456de7 RDX: 00007fff1f8ead90 RSI: 00007fff1f8eae20 RDI: 00007fff1f8eae20 RBP: 00000000000023b7 R08: 0000000000000000 R09: 0000000000000011 R10: 000000000000000a R11: 0000000000000206 R12: 00007fff1f8ebe80 R13: 00000000026b4940 R14: 0000000000000000 R15: badc0ffeebadface INFO: task syz-executor1:4332 blocked for more than 140 seconds. Not tainted 4.19.0-rc2-next-20180904+ #55 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor1 D17280 4332 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2825 [inline] __schedule+0x87c/0x1df0 kernel/sched/core.c:3473 schedule+0xfb/0x450 kernel/sched/core.c:3517 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline] rwsem_down_read_failed+0x362/0x610 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+0x16e/0x210 kernel/locking/percpu-rwsem.c:85 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:1515 sb_start_write include/linux/fs.h:1584 [inline] mnt_want_write+0x3f/0xc0 fs/namespace.c:360 do_unlinkat+0x2b7/0xa30 fs/namei.c:4045 __do_sys_unlink fs/namei.c:4110 [inline] __se_sys_unlink fs/namei.c:4108 [inline] __x64_sys_unlink+0x42/0x50 fs/namei.c:4108 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x456de7 Code: 0f 1f 00 b8 58 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 9d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 7d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffd181f4b18 EFLAGS: 00000206 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000456de7 RDX: 00007ffd181f4b30 RSI: 00007ffd181f4bc0 RDI: 00007ffd181f4bc0 RBP: 0000000000001d18 R08: 0000000000000000 R09: 0000000000000011 R10: 000000000000000a R11: 0000000000000206 R12: 00007ffd181f5c20 R13: 000000000252d940 R14: 0000000000000000 R15: badc0ffeebadface INFO: task syz-executor4:4333 blocked for more than 140 seconds. Not tainted 4.19.0-rc2-next-20180904+ #55 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor4 D18672 4333 1 0x00000004 Call Trace: context_switch kernel/sched/core.c:2825 [inline] __schedule+0x87c/0x1df0 kernel/sched/core.c:3473 schedule+0xfb/0x450 kernel/sched/core.c:3517 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline] rwsem_down_read_failed+0x362/0x610 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+0x16e/0x210 kernel/locking/percpu-rwsem.c:85 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:1515 sb_start_write include/linux/fs.h:1584 [inline] mnt_want_write+0x3f/0xc0 fs/namespace.c:360 do_unlinkat+0x2b7/0xa30 fs/namei.c:4045 __do_sys_unlink fs/namei.c:4110 [inline] __se_sys_unlink fs/namei.c:4108 [inline] __x64_sys_unlink+0x42/0x50 fs/namei.c:4108 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x456de7 Code: 0f 1f 00 b8 58 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 9d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 b8 57 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 7d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007ffd4a7f23b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000057 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000456de7 RDX: 00007ffd4a7f23d0 RSI: 00007ffd4a7f2460 RDI: 00007ffd4a7f2460 RBP: 0000000000001e0c R08: 0000000000000000 R09: 0000000000000011 R10: 000000000000000a R11: 0000000000000206 R12: 00007ffd4a7f34c0 R13: 0000000000f5c940 R14: 0000000000000000 R15: badc0ffeebadface INFO: task syz-executor0:10595 blocked for more than 140 seconds. Not tainted 4.19.0-rc2-next-20180904+ #55 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D22976 10595 4326 0x00000004 Call Trace: context_switch kernel/sched/core.c:2825 [inline] __schedule+0x87c/0x1df0 kernel/sched/core.c:3473 schedule+0xfb/0x450 kernel/sched/core.c:3517 percpu_down_write+0x435/0x540 kernel/locking/percpu-rwsem.c:162 sb_wait_write fs/super.c:1534 [inline] freeze_super+0x110/0x310 fs/super.c:1627 freeze_bdev+0x203/0x250 fs/block_dev.c:516 ext4_shutdown fs/ext4/ioctl.c:484 [inline] ext4_ioctl+0x17dd/0x4180 fs/ext4/ioctl.c:1043 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702 __do_sys_ioctl fs/ioctl.c:709 [inline] __se_sys_ioctl fs/ioctl.c:707 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457099 Code: Bad RIP value. RSP: 002b:00007f4dc1a36c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f4dc1a376d4 RCX: 0000000000457099 RDX: 0000000020000040 RSI: 000000008004587d RDI: 0000000000000004 RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004cebd8 R14: 00000000004c5056 R15: 0000000000000000 INFO: task syz-executor0:10617 blocked for more than 140 seconds. Not tainted 4.19.0-rc2-next-20180904+ #55 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D25216 10617 4326 0x00000004 Call Trace: context_switch kernel/sched/core.c:2825 [inline] __schedule+0x87c/0x1df0 kernel/sched/core.c:3473 schedule+0xfb/0x450 kernel/sched/core.c:3517 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline] rwsem_down_read_failed+0x362/0x610 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+0x16e/0x210 kernel/locking/percpu-rwsem.c:85 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:1515 sb_start_write include/linux/fs.h:1584 [inline] mnt_want_write+0x3f/0xc0 fs/namespace.c:360 do_last fs/namei.c:3311 [inline] path_openat+0x481c/0x5340 fs/namei.c:3534 do_filp_open+0x255/0x380 fs/namei.c:3564 do_sys_open+0x584/0x720 fs/open.c:1063 __do_sys_openat fs/open.c:1090 [inline] __se_sys_openat fs/open.c:1084 [inline] __x64_sys_openat+0x9d/0x100 fs/open.c:1084 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457099 Code: Bad RIP value. RSP: 002b:00007f4dc1a15c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f4dc1a166d4 RCX: 0000000000457099 RDX: 00000000000026e1 RSI: 0000000020000180 RDI: ffffffffffffff9c RBP: 0000000000930140 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004d3678 R14: 00000000004c83ea R15: 0000000000000001 INFO: task syz-executor0:10618 blocked for more than 140 seconds. Not tainted 4.19.0-rc2-next-20180904+ #55 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D25512 10618 4326 0x00000004 Call Trace: context_switch kernel/sched/core.c:2825 [inline] __schedule+0x87c/0x1df0 kernel/sched/core.c:3473 schedule+0xfb/0x450 kernel/sched/core.c:3517 schedule_preempt_disabled+0x10/0x20 kernel/sched/core.c:3575 __mutex_lock_common kernel/locking/mutex.c:1003 [inline] __mutex_lock+0xbf9/0x1700 kernel/locking/mutex.c:1073 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1088 freeze_bdev+0x2d/0x250 fs/block_dev.c:496 ext4_shutdown fs/ext4/ioctl.c:484 [inline] ext4_ioctl+0x17dd/0x4180 fs/ext4/ioctl.c:1043 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:501 [inline] do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702 __do_sys_ioctl fs/ioctl.c:709 [inline] __se_sys_ioctl fs/ioctl.c:707 [inline] __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x457099 Code: Bad RIP value. RSP: 002b:00007f4dc19f4c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f4dc19f56d4 RCX: 0000000000457099 RDX: 0000000020000040 RSI: 000000008004587d RDI: 0000000000000004 RBP: 00000000009301e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000004cebd8 R14: 00000000004c5056 R15: 0000000000000002 Showing all locks held in the system: 1 lock held by khungtaskd/793: #0: 000000008e518636 (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x428 kernel/locking/lockdep.c:4436 2 locks held by rs:main Q:Reg/4185: #0: 00000000f95b552f (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766 #1: 00000000da163b51 (sb_writers#5){++++}, at: file_start_write include/linux/fs.h:2786 [inline] #1: 00000000da163b51 (sb_writers#5){++++}, at: vfs_write+0x42a/0x560 fs/read_write.c:548 1 lock held by rsyslogd/4187: 2 locks held by getty/4277: #0: 00000000952ce675 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000438d973f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4278: #0: 000000009aa56a00 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000a0cf1613 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4279: #0: 000000008f386d2e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000c9067159 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4280: #0: 00000000435cbffd (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000cc7c6c26 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4281: #0: 0000000036d0e1eb (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000e714018e (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4282: #0: 0000000040b4342b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 00000000bf137656 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4283: #0: 000000009497c21e (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:353 #1: 000000001c212831 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 1 lock held by syz-executor7/4327: #0: 00000000da163b51 (sb_writers#5){++++}, at: sb_start_write include/linux/fs.h:1584 [inline] #0: 00000000da163b51 (sb_writers#5){++++}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 1 lock held by syz-executor6/4329: #0: 00000000da163b51 (sb_writers#5){++++}, at: sb_start_write include/linux/fs.h:1584 [inline] #0: 00000000da163b51 (sb_writers#5){++++}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 1 lock held by syz-executor3/4330: #0: 00000000da163b51 (sb_writers#5){++++}, at: sb_start_write include/linux/fs.h:1584 [inline] #0: 00000000da163b51 (sb_writers#5){++++}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 1 lock held by syz-executor5/4331: #0: 00000000da163b51 (sb_writers#5){++++}, at: sb_start_write include/linux/fs.h:1584 [inline] #0: 00000000da163b51 (sb_writers#5){++++}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 1 lock held by syz-executor1/4332: #0: 00000000da163b51 (sb_writers#5){++++}, at: sb_start_write include/linux/fs.h:1584 [inline] #0: 00000000da163b51 (sb_writers#5){++++}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 1 lock held by syz-executor4/4333: #0: 00000000da163b51 (sb_writers#5){++++}, at: sb_start_write include/linux/fs.h:1584 [inline] #0: 00000000da163b51 (sb_writers#5){++++}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 1 lock held by syz-executor6/18175: #0: 00000000da163b51 (sb_writers#5){++++}, at: file_start_write include/linux/fs.h:2786 [inline] #0: 00000000da163b51 (sb_writers#5){++++}, at: do_sendfile+0xac0/0xe20 fs/read_write.c:1439 2 locks held by syz-executor0/10595: #0: 00000000267f8557 (&bdev->bd_fsfreeze_mutex){+.+.}, at: freeze_bdev+0x2d/0x250 fs/block_dev.c:496 #1: 00000000da163b51 (sb_writers#5){++++}, at: percpu_down_write+0xaf/0x540 kernel/locking/percpu-rwsem.c:145 1 lock held by syz-executor0/10617: #0: 00000000da163b51 (sb_writers#5){++++}, at: sb_start_write include/linux/fs.h:1584 [inline] #0: 00000000da163b51 (sb_writers#5){++++}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 1 lock held by syz-executor0/10618: #0: 00000000267f8557 (&bdev->bd_fsfreeze_mutex){+.+.}, at: freeze_bdev+0x2d/0x250 fs/block_dev.c:496 1 lock held by syz-executor2/10609: #0: 00000000da163b51 (sb_writers#5){++++}, at: sb_start_write include/linux/fs.h:1584 [inline] #0: 00000000da163b51 (sb_writers#5){++++}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:360 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 793 Comm: khungtaskd Not tainted 4.19.0-rc2-next-20180904+ #55 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:204 [inline] watchdog+0xb39/0x1040 kernel/hung_task.c:265 kthread+0x35a/0x420 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:57