xarray page fault hang

 XFS (pmem0): DAX enabled. Warning: EXPERIMENTAL, use at your own risk
 XFS (pmem0): Mounting V5 Filesystem
 XFS (pmem0): Ending clean mount
 XFS (pmem1): DAX enabled. Warning: EXPERIMENTAL, use at your own risk
 XFS (pmem1): Mounting V5 Filesystem
 XFS (pmem1): Ending clean mount
 sysrq: SysRq : Show Blocked State
   task                        PC stack   pid father
 systemd-journal D    0  1330      1 0x000001a0
 Call Trace:
  ? __schedule+0x253/0x860
  schedule+0x28/0x80
  __xfs_log_force_lsn+0x14b/0x260 [xfs]
  ? wake_up_q+0x70/0x70
  ? xfs_file_fsync+0x19d/0x1d0 [xfs]
  xfs_log_force_lsn+0x8f/0x120 [xfs]
  xfs_file_fsync+0x19d/0x1d0 [xfs]
  do_fsync+0x38/0x70
  __x64_sys_fsync+0x10/0x20
  do_syscall_64+0x5b/0x160
  entry_SYSCALL_64_after_hwframe+0x44/0xa9
 RIP: 0033:0x7ff3dd6b7847
 Code: Bad RIP value.
 RSP: 002b:00007fff1437bbe0 EFLAGS: 00000293 ORIG_RAX: 00000000000000e8
 RAX: ffffffffffffffda RBX: 0000000000000008 RCX: 00007ff3dd6b7847
 RDX: 0000000000000022 RSI: 00007fff1437bc20 RDI: 0000000000000008
 RBP: 00007fff1437bc20 R08: 0000000000000000 R09: 00007fff143d2080
 R10: 00000000ffffffff R11: 0000000000000293 R12: 0000000000000022
 R13: 00000000ffffffff R14: 00007fff1437bc20 R15: 0000000000000001
 rocksdb:bg0     D    0  4649   4632 0x00000000
 Call Trace:
  ? __schedule+0x253/0x860
  schedule+0x28/0x80
  rwsem_down_read_failed+0xf8/0x180
  call_rwsem_down_read_failed+0x14/0x30
  down_read+0x1c/0x30
  __do_page_fault+0x44a/0x520
  do_page_fault+0x32/0x110
  ? page_fault+0x8/0x30
  page_fault+0x1e/0x30
 RIP: 0033:0x573908
 Code: Bad RIP value.
 RSP: 002b:00007f4d307fbe10 EFLAGS: 00010246
 RAX: 00007f39884bbad6 RBX: 00007f4d307fd430 RCX: 00000000008d8170
 RDX: 00000000000008e7 RSI: 0000000000000001 RDI: 0000000000000000
 RBP: 00007f4d307fd2a0 R08: 00007ffdc69dd0a0 R09: 00007ffdc69dd080
 R10: 0000000000c7a954 R11: 000000005c89b4b8 R12: 0000000000000000
 R13: 0000000000000000 R14: fffffffffffffe90 R15: 00000000000008e6
 rocksdb:bg1     D    0  4650   4632 0x00000000
 Call Trace:
  ? __schedule+0x253/0x860
  schedule+0x28/0x80
  rwsem_down_write_failed_killable+0x2c5/0x430
  call_rwsem_down_write_failed_killable+0x13/0x20
  down_write_killable+0x29/0x50
  __vm_munmap+0x4f/0xc0
  __x64_sys_munmap+0x27/0x30
  do_syscall_64+0x5b/0x160
  entry_SYSCALL_64_after_hwframe+0x44/0xa9
 RIP: 0033:0x7f4d31221feb
 Code: Bad RIP value.
 RSP: 002b:00007f4d2fffc3a8 EFLAGS: 00000202 ORIG_RAX: 000000000000000b
 RAX: ffffffffffffffda RBX: 00007f3dc03fffd0 RCX: 00007f4d31221feb
 RDX: 0000000000000008 RSI: 00000000043ec6cb RDI: 00007f3c87800000
 RBP: 00007f4d2fffc3d0 R08: 00007f4d30c00000 R09: 00007f4d2d807128
 R10: 00000000000000cb R11: 0000000000000202 R12: 00007f4d2d417220
 R13: 00007f4d2d85a310 R14: 0000000000407f10 R15: 00007f4d2fffccf0
 rocksdb:bg2     D    0  4651   4632 0x00000000
 Call Trace:
  ? __schedule+0x253/0x860
  schedule+0x28/0x80
  rwsem_down_read_failed+0xf8/0x180
  call_rwsem_down_read_failed+0x14/0x30
  down_read+0x1c/0x30
  __do_page_fault+0x44a/0x520
  do_page_fault+0x32/0x110
  ? page_fault+0x8/0x30
  page_fault+0x1e/0x30
 RIP: 0033:0x573908
 Code: Bad RIP value.
 RSP: 002b:00007f4d2effbe30 EFLAGS: 00010246
 RAX: 00007f39341b3a36 RBX: 00007f4d2effd450 RCX: 0000000000000000
 RDX: 00000000000008e7 RSI: 0000000000000000 RDI: 0000000000000000
 RBP: 00007f4d2effd2c0 R08: 00007ffdc69dd0a0 R09: 00007ffdc69dd080
 R10: 0000000000c7a954 R11: 000000005c89b4b8 R12: 0000000000000000
 R13: 0000000000000000 R14: fffffffffffffe90 R15: 00000000000008e6
 rocksdb:bg3     D    0  4652   4632 0x00000000
 Call Trace:
  ? __schedule+0x253/0x860
  schedule+0x28/0x80
  rwsem_down_read_failed+0xf8/0x180
  call_rwsem_down_read_failed+0x14/0x30
  down_read+0x1c/0x30
  __do_page_fault+0x44a/0x520
  do_page_fault+0x32/0x110
  ? page_fault+0x8/0x30
  page_fault+0x1e/0x30
 RIP: 0033:0x573908
 Code: Bad RIP value.
 RSP: 002b:00007f4d2e7fae10 EFLAGS: 00010246
 RAX: 00007f3cf9064d0c RBX: 00007f4d2e7fc430 RCX: 0000000000000000
 RDX: 00000000000008e3 RSI: 0000000000000000 RDI: 0000000000000000
 RBP: 00007f4d2e7fc2a0 R08: 00007ffdc69dd0a0 R09: 00007ffdc69dd080
 R10: 0000000000c7a954 R11: 000000005c89b4b8 R12: 0000000000000000
 R13: 0000000000000000 R14: fffffffffffffe90 R15: 00000000000008e2
 db_bench        D    0  4659   4632 0x00000000
 Call Trace:
  ? __schedule+0x253/0x860
  schedule+0x28/0x80
  rwsem_down_read_failed+0xf8/0x180
  call_rwsem_down_read_failed+0x14/0x30
  down_read+0x1c/0x30
  __do_page_fault+0x44a/0x520
  do_page_fault+0x32/0x110
  ? page_fault+0x8/0x30
  page_fault+0x1e/0x30
 RIP: 0033:0x7f4d3128bfc4
 Code: Bad RIP value.
 RSP: 002b:00007f4cf41fe2d8 EFLAGS: 00010202
 RAX: 00007f3dcafb8e07 RBX: 00007f4d28c3a000 RCX: 00007f3dcafb9107
 RDX: 0000000000000107 RSI: 00007f4d28c1c4d5 RDI: 00007f3dcafb8fa0
 RBP: 00007f4cf41fe370 R08: ffffffffffffffe7 R09: 000000000000001c
 R10: 0000000000000320 R11: 00007f3dcafb8e07 R12: 000000000088941f
 R13: 00007f4cf41fe4e0 R14: 0000000000000001 R15: 000000000000033f
 db_bench        D    0  4660   4632 0x00000000
 Call Trace:
  ? __schedule+0x253/0x860
  ? futex_wake+0x90/0x160
  schedule+0x28/0x80
  rwsem_down_read_failed+0xf8/0x180
  call_rwsem_down_read_failed+0x14/0x30
  down_read+0x1c/0x30
  __do_page_fault+0x44a/0x520
  do_page_fault+0x32/0x110
  ? page_fault+0x8/0x30
  page_fault+0x1e/0x30
 RIP: 0033:0x573908
 Code: Bad RIP value.
 RSP: 002b:00007f4cf39fbc10 EFLAGS: 00010297
 RAX: 00007f39eb40b771 RBX: 00007f4cf39fd1d0 RCX: 0000000000000000
 RDX: 00000000000008eb RSI: 0000000000000000 RDI: 00000000008d8140
 RBP: 00007f4cf39fd0a0 R08: 00007ffdc69dd0a0 R09: 00007ffdc69dd080
 R10: 0000000000c7a954 R11: 000000005c89b4b8 R12: 0000000000000000
 R13: 0000000000000000 R14: fffffffffffffe90 R15: 00000000000008ea
 db_bench        D    0  4661   4632 0x00000000
 Call Trace:
  ? __schedule+0x253/0x860
  ? futex_wake+0x90/0x160
  schedule+0x28/0x80
  rwsem_down_read_failed+0xf8/0x180
  call_rwsem_down_read_failed+0x14/0x30
  down_read+0x1c/0x30
  __do_page_fault+0x44a/0x520
  do_page_fault+0x32/0x110
  ? page_fault+0x8/0x30
  page_fault+0x1e/0x30
 RIP: 0033:0x573908
 Code: Bad RIP value.
 RSP: 002b:00007f4cf31fac10 EFLAGS: 00010297
 RAX: 00007f39c9a2963e RBX: 00007f4cf31fc1d0 RCX: 0000000000000000
 RDX: 00000000000008e9 RSI: 0000000000000000 RDI: 00000000008d8140
 RBP: 00007f4cf31fc0a0 R08: 00007ffdc69dd0a0 R09: 00007ffdc69dd080
 R10: 0000000000c7a954 R11: 000000005c89b4b8 R12: 0000000000000000
 R13: 0000000000000000 R14: fffffffffffffe90 R15: 00000000000008e8
 db_bench        D    0  4662   4632 0x00000000
 Call Trace:
  ? __schedule+0x253/0x860
  ? futex_wake+0x90/0x160
  schedule+0x28/0x80
  rwsem_down_read_failed+0xf8/0x180
  call_rwsem_down_read_failed+0x14/0x30
  down_read+0x1c/0x30
  __do_page_fault+0x44a/0x520
  do_page_fault+0x32/0x110
  ? page_fault+0x8/0x30
  page_fault+0x1e/0x30
 RIP: 0033:0x573908
 Code: Bad RIP value.
 RSP: 002b:00007f4cf29f9c10 EFLAGS: 00010297
 RAX: 00007f42680d2df8 RBX: 00007f4cf29fb1d0 RCX: 0000000000000000
 RDX: 00000000000008ed RSI: 0000000000000000 RDI: 00000000008d8140
 RBP: 00007f4cf29fb0a0 R08: 00007ffdc69dd0a0 R09: 00007ffdc69dd080
 R10: 0000000000c7a954 R11: 000000005c89b4b8 R12: 0000000000000000
 R13: 0000000000000000 R14: fffffffffffffe90 R15: 00000000000008ec
 db_bench        D    0  4663   4632 0x00000000
 Call Trace:
  ? __schedule+0x253/0x860
  ? futex_wake+0x90/0x160
  schedule+0x28/0x80
  rwsem_down_read_failed+0xf8/0x180
  call_rwsem_down_read_failed+0x14/0x30
  down_read+0x1c/0x30
  __do_page_fault+0x44a/0x520
  do_page_fault+0x32/0x110
  ? page_fault+0x8/0x30
  page_fault+0x1e/0x30
 RIP: 0033:0x573908
 Code: Bad RIP value.
 RSP: 002b:00007f4cf21f8c10 EFLAGS: 00010297
 RAX: 00007f3a00d48ff7 RBX: 00007f4cf21fa1d0 RCX: 0000000000000000
 RDX: 00000000000008ea RSI: 0000000000000000 RDI: 00000000008d8140
 RBP: 00007f4cf21fa0a0 R08: 00007ffdc69dd0a0 R09: 00007ffdc69dd080
 R10: 0000000000c7a954 R11: 000000005c89b4b8 R12: 0000000000000000
 R13: 0000000000000000 R14: fffffffffffffe90 R15: 00000000000008e9
 db_bench        D    0  4664   4632 0x00000000
 Call Trace:
  ? __schedule+0x253/0x860
  ? futex_wake+0x90/0x160
  schedule+0x28/0x80
  rwsem_down_read_failed+0xf8/0x180
  call_rwsem_down_read_failed+0x14/0x30
  down_read+0x1c/0x30
  __do_page_fault+0x44a/0x520
  do_page_fault+0x32/0x110
  ? page_fault+0x8/0x30
  page_fault+0x1e/0x30
 RIP: 0033:0x573908
 Code: Bad RIP value.
 RSP: 002b:00007f4cf19f7c10 EFLAGS: 00010297
 RAX: 00007f3ab1c435de RBX: 00007f4cf19f91d0 RCX: 0000000000000000
 RDX: 00000000000008e6 RSI: 0000000000000000 RDI: 00000000008d8140
 RBP: 00007f4cf19f90a0 R08: 00007ffdc69dd0a0 R09: 00007ffdc69dd080
 R10: 0000000000c7a954 R11: 000000005c89b4b8 R12: 0000000000000000
 R13: 0000000000000000 R14: fffffffffffffe90 R15: 00000000000008e5
 db_bench        D    0  4665   4632 0x00000000
 Call Trace:
  ? __schedule+0x253/0x860
  ? futex_wake+0x90/0x160
  schedule+0x28/0x80
  rwsem_down_read_failed+0xf8/0x180
  call_rwsem_down_read_failed+0x14/0x30
  down_read+0x1c/0x30
  __do_page_fault+0x44a/0x520
  do_page_fault+0x32/0x110
  ? page_fault+0x8/0x30
  page_fault+0x1e/0x30
 RIP: 0033:0x573908
 Code: Bad RIP value.
 RSP: 002b:00007f4cf11f6c10 EFLAGS: 00010297
 RAX: 00007f3a4d00fd17 RBX: 00007f4cf11f81d0 RCX: 0000000000000000
 RDX: 00000000000008eb RSI: 0000000000000000 RDI: 00000000008d8140
 RBP: 00007f4cf11f80a0 R08: 00007ffdc69dd0a0 R09: 00007ffdc69dd080
 R10: 0000000000c7a954 R11: 000000005c89b4b8 R12: 0000000000000000
 R13: 0000000000000000 R14: fffffffffffffe90 R15: 00000000000008ea
 db_bench        D    0  4666   4632 0x00000000
 Call Trace:
  ? __schedule+0x253/0x860
  ? futex_wake+0x90/0x160
  schedule+0x28/0x80
  rwsem_down_read_failed+0xf8/0x180
  call_rwsem_down_read_failed+0x14/0x30
  down_read+0x1c/0x30
  __do_page_fault+0x44a/0x520
  do_page_fault+0x32/0x110
  ? page_fault+0x8/0x30
  page_fault+0x1e/0x30
 RIP: 0033:0x591d60
 Code: Bad RIP value.
 RSP: 002b:00007f4cf09f5c08 EFLAGS: 00010216
 RAX: 00000000ffffffff RBX: 00007f4cf09f71d0 RCX: 00000000000008ed
 RDX: 00007f39e575574d RSI: 00007f39e5754e60 RDI: 00007f39e5754e60
 RBP: 00007f4cf09f70a0 R08: 00007ffdc69dd0a0 R09: 00007ffdc69dd080
 R10: 0000000000c7a954 R11: 000000005c89b4b8 R12: 0000000000000000
 R13: 0000000000000000 R14: fffffffffffffe90 R15: 00000000000008ec
 db_bench        D    0  4667   4632 0x00000000
 Call Trace:
  ? __schedule+0x253/0x860
  ? futex_wake+0x90/0x160
  schedule+0x28/0x80
  rwsem_down_read_failed+0xf8/0x180
  call_rwsem_down_read_failed+0x14/0x30
  down_read+0x1c/0x30
  __do_page_fault+0x44a/0x520
  do_page_fault+0x32/0x110
  ? page_fault+0x8/0x30
  page_fault+0x1e/0x30
 RIP: 0033:0x573908
 Code: Bad RIP value.
 RSP: 002b:00007f4cf01f4c10 EFLAGS: 00010297
 RAX: 00007f4b65ad8612 RBX: 00007f4cf01f61d0 RCX: 0000000000000000
 RDX: 00000000000008f4 RSI: 0000000000000000 RDI: 00000000008d8140
 RBP: 00007f4cf01f60a0 R08: 00007ffdc69dd0a0 R09: 00007ffdc69dd080
 R10: 0000000000c7a954 R11: 000000005c89b4b8 R12: 0000000000000000
 R13: 0000000000000000 R14: fffffffffffffe90 R15: 00000000000008f3
 db_bench        D    0  4668   4632 0x00000000
 Call Trace:
  ? __schedule+0x253/0x860
  ? futex_wake+0x90/0x160
  schedule+0x28/0x80
  rwsem_down_read_failed+0xf8/0x180
  call_rwsem_down_read_failed+0x14/0x30
  down_read+0x1c/0x30
  __do_page_fault+0x44a/0x520
  do_page_fault+0x32/0x110
  ? page_fault+0x8/0x30
  page_fault+0x1e/0x30
 RIP: 0033:0x573908
 Code: Bad RIP value.
 RSP: 002b:00007f4cef9f3c10 EFLAGS: 00010297
 RAX: 00007f39c924fb30 RBX: 00007f4cef9f51d0 RCX: 0000000000000000
 RDX: 00000000000008e9 RSI: 0000000000000000 RDI: 00000000008d8140
 RBP: 00007f4cef9f50a0 R08: 00007ffdc69dd0a0 R09: 00007ffdc69dd080
 R10: 0000000000c7a954 R11: 000000005c89b4b8 R12: 0000000000000000
 R13: 0000000000000000 R14: fffffffffffffe90 R15: 00000000000008e8
 db_bench        D    0  4669   4632 0x00000000
 Call Trace:
  ? __schedule+0x253/0x860
  ? futex_wake+0x90/0x160
  schedule+0x28/0x80
  rwsem_down_read_failed+0xf8/0x180
  call_rwsem_down_read_failed+0x14/0x30
  down_read+0x1c/0x30
  __do_page_fault+0x44a/0x520
  do_page_fault+0x32/0x110
  ? page_fault+0x8/0x30
  page_fault+0x1e/0x30
 RIP: 0033:0x573908
 Code: Bad RIP value.
 RSP: 002b:00007f4cef1f2c10 EFLAGS: 00010297
 RAX: 00007f3942426910 RBX: 00007f4cef1f41d0 RCX: 0000000000000000
 RDX: 00000000000008e7 RSI: 0000000000000000 RDI: 00000000008d8140
 RBP: 00007f4cef1f40a0 R08: 00007ffdc69dd0a0 R09: 00007ffdc69dd080
 R10: 0000000000c7a954 R11: 000000005c89b4b8 R12: 0000000000000000
 R13: 0000000000000000 R14: fffffffffffffe90 R15: 00000000000008e6
 db_bench        D    0  4670   4632 0x00000000
 Call Trace:
  ? __schedule+0x253/0x860
  ? futex_wake+0x90/0x160
  schedule+0x28/0x80
  rwsem_down_read_failed+0xf8/0x180
  call_rwsem_down_read_failed+0x14/0x30
  down_read+0x1c/0x30
  __do_page_fault+0x44a/0x520
  do_page_fault+0x32/0x110
  ? page_fault+0x8/0x30
  page_fault+0x1e/0x30
 RIP: 0033:0x573908
 Code: Bad RIP value.
 RSP: 002b:00007f4cee9f1c10 EFLAGS: 00010297
 RAX: 00007f39ef05bf17 RBX: 00007f4cee9f31d0 RCX: 0000000000000000
 RDX: 00000000000008e3 RSI: 0000000000000000 RDI: 00000000008d8140
 RBP: 00007f4cee9f30a0 R08: 00007ffdc69dd0a0 R09: 00007ffdc69dd080
 R10: 0000000000c7a954 R11: 000000005c89b4b8 R12: 0000000000000000
 R13: 0000000000000000 R14: fffffffffffffe90 R15: 00000000000008e2
 db_bench        D    0  4671   4632 0x00000000
 Call Trace:
  ? __schedule+0x253/0x860
  ? futex_wake+0x90/0x160
  schedule+0x28/0x80
  rwsem_down_read_failed+0xf8/0x180
  call_rwsem_down_read_failed+0x14/0x30
  down_read+0x1c/0x30
  __do_page_fault+0x44a/0x520
  do_page_fault+0x32/0x110
  ? page_fault+0x8/0x30
  page_fault+0x1e/0x30
 RIP: 0033:0x573908
 Code: Bad RIP value.
 RSP: 002b:00007f4cee1f0c10 EFLAGS: 00010297
 RAX: 00007f4188abe697 RBX: 00007f4cee1f21d0 RCX: 0000000000000000
 RDX: 00000000000008e9 RSI: 0000000000000000 RDI: 00000000008d8140
 RBP: 00007f4cee1f20a0 R08: 00007ffdc69dd0a0 R09: 00007ffdc69dd080
 R10: 0000000000c7a954 R11: 000000005c89b4b8 R12: 0000000000000000
 R13: 0000000000000000 R14: fffffffffffffe90 R15: 00000000000008e8
 db_bench        D    0  4672   4632 0x00000000
 Call Trace:
  ? __schedule+0x253/0x860
  ? futex_wake+0x90/0x160
  schedule+0x28/0x80
  rwsem_down_read_failed+0xf8/0x180
  call_rwsem_down_read_failed+0x14/0x30
  down_read+0x1c/0x30
  __do_page_fault+0x44a/0x520
  do_page_fault+0x32/0x110
  ? page_fault+0x8/0x30
  page_fault+0x1e/0x30
 RIP: 0033:0x573908
 Code: Bad RIP value.
 RSP: 002b:00007f4ced9efc10 EFLAGS: 00010297
 RAX: 00007f3a82862e15 RBX: 00007f4ced9f11d0 RCX: 0000000000000000
 RDX: 00000000000008eb RSI: 0000000000000000 RDI: 00000000008d8140
 RBP: 00007f4ced9f10a0 R08: 00007ffdc69dd0a0 R09: 00007ffdc69dd080
 R10: 0000000000c7a954 R11: 000000005c89b4b8 R12: 0000000000000000
 R13: 0000000000000000 R14: fffffffffffffe90 R15: 00000000000008ea
 db_bench        D    0  4673   4632 0x00000000
 Call Trace:
  ? __schedule+0x253/0x860
  schedule+0x28/0x80
  get_unlocked_entry+0xcd/0x120
  ? dax_iomap_actor+0x270/0x270
  grab_mapping_entry+0x9b/0x210
  dax_iomap_pmd_fault.isra.41+0x14f/0x940
  __xfs_filemap_fault+0xba/0x200 [xfs]
  ? mpol_misplaced+0xb1/0x190
  __handle_mm_fault+0x405/0x1380
  ? do_futex+0x126/0xa60
  handle_mm_fault+0xda/0x200
  __do_page_fault+0x26c/0x520
  do_page_fault+0x32/0x110
  ? page_fault+0x8/0x30
  page_fault+0x1e/0x30
 RIP: 0033:0x573908
 Code: Bad RIP value.
 RSP: 002b:00007f4ced1eec10 EFLAGS: 00010297
 RAX: 00007f39bc3a6251 RBX: 00007f4ced1f01d0 RCX: 0000000000000000
 RDX: 00000000000008e9 RSI: 0000000000000000 RDI: 00000000008d8140
 RBP: 00007f4ced1f00a0 R08: 00007ffdc69dd0a0 R09: 00007ffdc69dd080
 R10: 0000000000c7a75a R11: 000000005c89b4b7 R12: 0000000000000000
 R13: 0000000000000000 R14: fffffffffffffe90 R15: 00000000000008e8
 db_bench        D    0  4674   4632 0x00000000
 Call Trace:
  ? __schedule+0x253/0x860
  schedule+0x28/0x80
  rwsem_down_read_failed+0xf8/0x180
  ? __handle_mm_fault+0xe9e/0x1380
  call_rwsem_down_read_failed+0x14/0x30
  down_read+0x1c/0x30
  __do_page_fault+0x44a/0x520
  do_page_fault+0x32/0x110
  ? page_fault+0x8/0x30
  page_fault+0x1e/0x30
 RIP: 0033:0x573908
 Code: Bad RIP value.
 RSP: 002b:00007f4cec9edc10 EFLAGS: 00010297
 RAX: 00007f4186b99e95 RBX: 00007f4cec9ef1d0 RCX: 0000000000000000
 RDX: 00000000000008eb RSI: 0000000000000000 RDI: 00000000008d8140
 RBP: 00007f4cec9ef0a0 R08: 00007ffdc69dd0a0 R09: 00007ffdc69dd080
 R10: 0000000000c7a954 R11: 000000005c89b4b8 R12: 0000000000000000
 R13: 0000000000000000 R14: fffffffffffffe90 R15: 00000000000008ea
 db_bench        D    0  4675   4632 0x00000000
 Call Trace:
  ? __schedule+0x253/0x860
  ? futex_wake+0x90/0x160
  schedule+0x28/0x80
  rwsem_down_read_failed+0xf8/0x180
  call_rwsem_down_read_failed+0x14/0x30
  down_read+0x1c/0x30
  __do_page_fault+0x44a/0x520
  do_page_fault+0x32/0x110
  ? page_fault+0x8/0x30
  page_fault+0x1e/0x30
 RIP: 0033:0x573908
 Code: Bad RIP value.
 RSP: 002b:00007f4ce7dfcc10 EFLAGS: 00010297
 RAX: 00007f3b09b4e714 RBX: 00007f4ce7dfe1d0 RCX: 0000000000000000
 RDX: 00000000000008ea RSI: 0000000000000000 RDI: 00000000008d8140
 RBP: 00007f4ce7dfe0a0 R08: 00007ffdc69dd0a0 R09: 00007ffdc69dd080
 R10: 0000000000c7a956 R11: 000000005c89b4b8 R12: 0000000000000000
 R13: 0000000000000000 R14: fffffffffffffe90 R15: 00000000000008e9
 rocksdb:bg0     D    0  4719   4632 0x00000000
 Call Trace:
  ? __schedule+0x253/0x860
  schedule+0x28/0x80
  rwsem_down_read_failed+0xf8/0x180
  call_rwsem_down_read_failed+0x14/0x30
  down_read+0x1c/0x30
  __do_page_fault+0x44a/0x520
  do_page_fault+0x32/0x110
  ? page_fault+0x8/0x30
  page_fault+0x1e/0x30
 RIP: 0033:0x58fab7
 Code: Bad RIP value.
 RSP: 002b:00007f3ed43fc3d0 EFLAGS: 00010206
 RAX: 00000000e5164259 RBX: 00007f3eb6018ca0 RCX: 0000000000022c00
 RDX: 00007f3c83e7e000 RSI: 0000000000000014 RDI: 00007f3ed43fc874
 RBP: 00007f3ed43fc3f0 R08: 0000000000000000 R09: 00007f3ed43fc864
 R10: 0000000000000059 R11: 00007f4cebffd338 R12: 00007f3ed43fc430
 R13: 00007f3ed43fc7e8 R14: 00007f3ed43fc7f8 R15: 0000000000000000
 ps              D    0  4842   4841 0x00000000
 Call Trace:
  ? __schedule+0x253/0x860
  schedule+0x28/0x80
  rwsem_down_read_failed+0xf8/0x180
  call_rwsem_down_read_failed+0x14/0x30
  down_read+0x1c/0x30
  __access_remote_vm+0x5b/0x350
  proc_pid_cmdline_read+0x1a4/0x350
  __vfs_read+0x36/0x190
  vfs_read+0x8a/0x140
  ksys_read+0x4f/0xb0
  do_syscall_64+0x5b/0x160
  entry_SYSCALL_64_after_hwframe+0x44/0xa9
 RIP: 0033:0x7efe5fb44e35
 Code: Bad RIP value.
 RSP: 002b:00007ffe6583b838 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
 RAX: ffffffffffffffda RBX: 00007efe5299a010 RCX: 00007efe5fb44e35
 RDX: 0000000000020000 RSI: 00007efe5299a010 RDI: 0000000000000006
 RBP: 0000000000020000 R08: 00007efe5fcd6cff R09: 00007ffe6583b1a0
 R10: 0000000000000000 R11: 0000000000000246 R12: 00007efe5299a010
 R13: 0000000000000000 R14: 0000000000000006 R15: 0000000000000000
 ps              D    0  4870   4524 0x00000000
 Call Trace:
  ? __schedule+0x253/0x860
  schedule+0x28/0x80
  rwsem_down_read_failed+0xf8/0x180
  call_rwsem_down_read_failed+0x14/0x30
  down_read+0x1c/0x30
  __access_remote_vm+0x5b/0x350
  proc_pid_cmdline_read+0x1a4/0x350
  __vfs_read+0x36/0x190
  vfs_read+0x8a/0x140
  ksys_read+0x4f/0xb0
  do_syscall_64+0x5b/0x160
  entry_SYSCALL_64_after_hwframe+0x44/0xa9
 RIP: 0033:0x7faae3f29e35
 Code: Bad RIP value.
 RSP: 002b:00007ffca1250588 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
 RAX: ffffffffffffffda RBX: 00007faad6d7f010 RCX: 00007faae3f29e35
 RDX: 0000000000020000 RSI: 00007faad6d7f010 RDI: 0000000000000006
 RBP: 0000000000020000 R08: 00007faae40bbcff R09: 00007ffca124fef0
 R10: 0000000000000000 R11: 0000000000000246 R12: 00007faad6d7f010
 R13: 0000000000000000 R14: 0000000000000006 R15: 0000000000000000