Dear Maintainer,
Nothing in log:
root@debian:~# journalctl -u udisks2.service -f
Apr 22 23:39:50 debian systemd[1]: Starting udisks2.service - Disk Manager...
Apr 22 23:39:50 debian udisksd[2716]: udisks daemon version 2.9.4 starting
Apr 22 23:39:50 debian udisksd[2716]: failed to load module mdraid: libbd_mdraid.so.2: cannot open shared object file: No such file or directory
Apr 22 23:39:50 debian udisksd[2716]: Failed to load the 'mdraid' libblockdev plugin
Apr 22 23:39:50 debian systemd[1]: Started udisks2.service - Disk Manager.
Apr 22 23:39:50 debian udisksd[2716]: Acquired the name org.freedesktop.UDisks2 on the system message bus
Apr 22 23:40:01 debian udisksd[2716]: Mounted /dev/sdb1 at /media/user/4EFB-0929 on behalf of uid 1000
Apr 23 02:52:18 debian udisksd[2716]: Cleaning up mount point /media/user/4EFB-0929 (device 8:17 is not mounted)
Apr 23 02:52:18 debian udisksd[2716]: Unmounted /dev/sdb1 on behalf of uid 1000
CPU usage was high by udisksd before unmounting. Unmounting did not help.
It is not using 100% of a core, but still 15-25% is super high CPU usage
for a simple service.
0.1 second of strace snippet:
root@debian:~# strace -f -p 2716 -ttt -TTT
strace: Process 2716 attached with 5 threads
[pid 2780] 1682218613.791992 restart_syscall(<... resuming interrupted read ...> <unfinished ...>
[pid 2759] 1682218613.792072 futex(0x55e5b77a75c0, FUTEX_WAIT_PRIVATE, 7, NULL <unfinished ...>
[pid 2750] 1682218613.792111 restart_syscall(<... resuming interrupted read ...> <unfinished ...>
[pid 2746] 1682218613.792141 restart_syscall(<... resuming interrupted read ...> <unfinished ...>
[pid 2716] 1682218613.792172 restart_syscall(<... resuming interrupted read ...> <unfinished ...>
[pid 2750] 1682218613.837989 <... restart_syscall resumed>) = 1 <0.045842>
[pid 2750] 1682218613.838065 write(7, "\1\0\0\0\0\0\0\0", 8) = 8 <0.000022>
[pid 2750] 1682218613.838188 recvmsg(6, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="l\1\0\1\0\0\0\0\252h\4\0\247\0\0\0", iov_len=16}], msg_iovlen=1, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 16 <0.000022>
[pid 2750] 1682218613.838339 poll([{fd=6, events=POLLIN}], 1, 0) = 1 ([{fd=6, revents=POLLIN}]) <0.000023>
[pid 2750] 1682218613.838469 recvmsg(6, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\1\1o\0\30\0\0\0/org/freedesktop/UDisks2"..., iov_len=168}], msg_iovlen=1, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 168 <0.000018>
[pid 2750] 1682218613.838596 write(7, "\1\0\0\0\0\0\0\0", 8) = 8 <0.000014>
[pid 2750] 1682218613.838668 write(7, "\1\0\0\0\0\0\0\0", 8) = 8 <0.000016>
[pid 2750] 1682218613.838745 poll([{fd=7, events=POLLIN}], 1, 0) = 1 ([{fd=7, revents=POLLIN}]) <0.000014>
[pid 2750] 1682218613.838821 read(7, "\3\0\0\0\0\0\0\0", 16) = 8 <0.000014>
[pid 2750] 1682218613.838935 write(4, "\1\0\0\0\0\0\0\0", 8) = 8 <0.000016>
[pid 2716] 1682218613.839000 <... restart_syscall resumed>) = 1 <0.046807>
[pid 2750] 1682218613.839033 poll([{fd=6, events=POLLIN}], 1, 0 <unfinished ...>
[pid 2716] 1682218613.839077 read(4, <unfinished ...>
[pid 2750] 1682218613.839106 <... poll resumed>) = 0 (Timeout) <0.000043>
[pid 2716] 1682218613.839138 <... read resumed>"\1\0\0\0\0\0\0\0", 16) = 8 <0.000039>
[pid 2750] 1682218613.839176 write(7, "\1\0\0\0\0\0\0\0", 8) = 8 <0.000015>
[pid 2750] 1682218613.839250 poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}], 2, -1) = 1 ([{fd=7, revents=POLLIN}]) <0.000016>
[pid 2750] 1682218613.839339 read(7, "\1\0\0\0\0\0\0\0", 16) = 8 <0.000014>
[pid 2750] 1682218613.839407 poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}], 2, -1 <unfinished ...>
[pid 2716] 1682218613.840785 write(7, "\1\0\0\0\0\0\0\0", 8 <unfinished ...>
[pid 2750] 1682218613.840843 <... poll resumed>) = 1 ([{fd=7, revents=POLLIN}]) <0.001401>
[pid 2716] 1682218613.840876 <... write resumed>) = 8 <0.000058>
[pid 2750] 1682218613.840908 futex(0x7f2e2c00e6a0, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
[pid 2716] 1682218613.840950 futex(0x7f2e2c00e6a0, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 2750] 1682218613.840981 <... futex resumed>) = -1 EAGAIN (Resource temporarily unavailable) <0.000043>
[pid 2716] 1682218613.841114 <... futex resumed>) = 0 <0.000141>
[pid 2750] 1682218613.841140 read(7, <unfinished ...>
[pid 2716] 1682218613.841179 futex(0x7f2e2c00e6a0, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
[pid 2750] 1682218613.841210 <... read resumed>"\1\0\0\0\0\0\0\0", 16) = 8 <0.000042>
[pid 2750] 1682218613.841254 futex(0x7f2e2c00e6a0, FUTEX_WAKE_PRIVATE, 1) = 1 <0.000017>
[pid 2716] 1682218613.841317 <... futex resumed>) = 0 <0.000114>
[pid 2750] 1682218613.841349 futex(0x7f2e2c00e430, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
[pid 2716] 1682218613.841387 futex(0x7f2e2c00e6a0, FUTEX_WAKE_PRIVATE, 1) = 0 <0.000009>
[pid 2716] 1682218613.841445 futex(0x7f2e2c00e430, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 2750] 1682218613.841491 <... futex resumed>) = 0 <0.000113>
[pid 2716] 1682218613.841518 <... futex resumed>) = 1 <0.000049>
[pid 2750] 1682218613.841549 futex(0x7f2e2c00e430, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 2716] 1682218613.841590 poll([{fd=4, events=POLLIN}, {fd=8, events=0}, {fd=9, events=0}, {fd=11, events=POLLIN}, {fd=13, events=POLLIN}, {fd=14, events=0}], 6, 176044 <unfinished ...>
[pid 2750] 1682218613.841630 <... futex resumed>) = 0 <0.000052>
[pid 2750] 1682218613.841673 sendmsg(6, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="l\2\1\1\234R\0\0\356\232\v\0000\0\0\0\6\1s\0\6\0\0\0:1.277\0\0"..., iov_len=21212}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 21212 <0.000024>
[pid 2750] 1682218613.841774 poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}], 2, 0) = 0 (Timeout) <0.000024>
[pid 2750] 1682218613.842030 poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}], 2, -1) = 1 ([{fd=6, revents=POLLIN}]) <0.000462>
[pid 2750] 1682218613.842561 write(7, "\1\0\0\0\0\0\0\0", 8) = 8 <0.000014>
[pid 2750] 1682218613.842633 recvmsg(6, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="l\1\0\1\0\0\0\0\253h\4\0\247\0\0\0", iov_len=16}], msg_iovlen=1, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 16 <0.000015>
[pid 2750] 1682218613.842715 poll([{fd=6, events=POLLIN}], 1, 0) = 1 ([{fd=6, revents=POLLIN}]) <0.000014>
[pid 2750] 1682218613.842789 recvmsg(6, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\1\1o\0\30\0\0\0/org/freedesktop/UDisks2"..., iov_len=168}], msg_iovlen=1, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 168 <0.000015>
[pid 2750] 1682218613.842872 write(7, "\1\0\0\0\0\0\0\0", 8) = 8 <0.000014>
[pid 2750] 1682218613.842941 write(7, "\1\0\0\0\0\0\0\0", 8) = 8 <0.000014>
[pid 2750] 1682218613.843011 poll([{fd=7, events=POLLIN}], 1, 0) = 1 ([{fd=7, revents=POLLIN}]) <0.000014>
[pid 2750] 1682218613.843084 read(7, "\3\0\0\0\0\0\0\0", 16) = 8 <0.000014>
[pid 2750] 1682218613.843175 write(4, "\1\0\0\0\0\0\0\0", 8) = 8 <0.000018>
[pid 2716] 1682218613.843234 <... poll resumed>) = 1 ([{fd=4, revents=POLLIN}]) <0.001613>
[pid 2750] 1682218613.843272 poll([{fd=6, events=POLLIN}], 1, 0) = 0 (Timeout) <0.000016>
[pid 2716] 1682218613.843332 read(4, <unfinished ...>
[pid 2750] 1682218613.843379 write(7, "\1\0\0\0\0\0\0\0", 8 <unfinished ...>
[pid 2716] 1682218613.843420 <... read resumed>"\1\0\0\0\0\0\0\0", 16) = 8 <0.000056>
[pid 2750] 1682218613.843463 <... write resumed>) = 8 <0.000051>
[pid 2750] 1682218613.843511 poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}], 2, -1) = 1 ([{fd=7, revents=POLLIN}]) <0.000017>
[pid 2750] 1682218613.843600 read(7, "\1\0\0\0\0\0\0\0", 16) = 8 <0.000016>
[pid 2750] 1682218613.843676 poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}], 2, -1 <unfinished ...>
[pid 2716] 1682218613.844878 write(7, "\1\0\0\0\0\0\0\0", 8) = 8 <0.000017>
[pid 2750] 1682218613.844937 <... poll resumed>) = 1 ([{fd=7, revents=POLLIN}]) <0.001228>
[pid 2716] 1682218613.844979 poll([{fd=4, events=POLLIN}, {fd=8, events=0}, {fd=9, events=0}, {fd=11, events=POLLIN}, {fd=13, events=POLLIN}, {fd=14, events=0}], 6, 176041 <unfinished ...>
[pid 2750] 1682218613.845018 read(7, "\1\0\0\0\0\0\0\0", 16) = 8 <0.000014>
[pid 2750] 1682218613.845090 sendmsg(6, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="l\2\1\1\234R\0\0\357\232\v\0000\0\0\0\6\1s\0\6\0\0\0:1.277\0\0"..., iov_len=21212}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 21212 <0.000021>
[pid 2750] 1682218613.845190 poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}], 2, 0) = 0 (Timeout) <0.000011>
[pid 2750] 1682218613.845456 poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}], 2, -1) = 1 ([{fd=6, revents=POLLIN}]) <0.000382>
[pid 2750] 1682218613.845903 write(7, "\1\0\0\0\0\0\0\0", 8) = 8 <0.000014>
[pid 2750] 1682218613.845972 recvmsg(6, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="l\1\0\1\0\0\0\0\254h\4\0\247\0\0\0", iov_len=16}], msg_iovlen=1, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 16 <0.000016>
[pid 2750] 1682218613.846063 poll([{fd=6, events=POLLIN}], 1, 0) = 1 ([{fd=6, revents=POLLIN}]) <0.000014>
[pid 2750] 1682218613.846137 recvmsg(6, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\1\1o\0\30\0\0\0/org/freedesktop/UDisks2"..., iov_len=168}], msg_iovlen=1, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 168 <0.000016>
[pid 2750] 1682218613.846221 write(7, "\1\0\0\0\0\0\0\0", 8) = 8 <0.000015>
[pid 2750] 1682218613.846292 write(7, "\1\0\0\0\0\0\0\0", 8) = 8 <0.000016>
[pid 2750] 1682218613.846369 poll([{fd=7, events=POLLIN}], 1, 0) = 1 ([{fd=7, revents=POLLIN}]) <0.000014>
[pid 2750] 1682218613.846442 read(7, "\3\0\0\0\0\0\0\0", 16) = 8 <0.000013>
[pid 2750] 1682218613.846534 write(4, "\1\0\0\0\0\0\0\0", 8) = 8 <0.000017>
[pid 2716] 1682218613.846592 <... poll resumed>) = 1 ([{fd=4, revents=POLLIN}]) <0.001583>
[pid 2750] 1682218613.846632 poll([{fd=6, events=POLLIN}], 1, 0 <unfinished ...>
[pid 2716] 1682218613.846670 read(4, <unfinished ...>
[pid 2750] 1682218613.846710 <... poll resumed>) = 0 (Timeout) <0.000043>
[pid 2716] 1682218613.846736 <... read resumed>"\1\0\0\0\0\0\0\0", 16) = 8 <0.000044>
[pid 2750] 1682218613.846773 write(7, "\1\0\0\0\0\0\0\0", 8) = 8 <0.000014>
[pid 2750] 1682218613.846842 futex(0x55e5b77aa070, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 2716] 1682218613.846875 futex(0x55e5b77aa070, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
[pid 2750] 1682218613.846915 <... futex resumed>) = 0 <0.000044>
[pid 2716] 1682218613.846941 <... futex resumed>) = -1 EAGAIN (Resource temporarily unavailable) <0.000044>
[pid 2750] 1682218613.846979 poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}], 2, -1 <unfinished ...>
[pid 2716] 1682218613.847016 futex(0x55e5b77aa070, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 2750] 1682218613.847057 <... poll resumed>) = 1 ([{fd=7, revents=POLLIN}]) <0.000043>
[pid 2716] 1682218613.847088 <... futex resumed>) = 0 <0.000049>
[pid 2750] 1682218613.847120 read(7, "\1\0\0\0\0\0\0\0", 16) = 8 <0.000015>
[pid 2750] 1682218613.847187 poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}], 2, -1 <unfinished ...>
[pid 2716] 1682218613.848428 write(7, "\1\0\0\0\0\0\0\0", 8) = 8 <0.000017>
[pid 2750] 1682218613.848489 <... poll resumed>) = 1 ([{fd=7, revents=POLLIN}]) <0.001273>
[pid 2716] 1682218613.848528 poll([{fd=4, events=POLLIN}, {fd=8, events=0}, {fd=9, events=0}, {fd=11, events=POLLIN}, {fd=13, events=POLLIN}, {fd=14, events=0}], 6, 176037 <unfinished ...>
[pid 2750] 1682218613.848574 read(7, "\1\0\0\0\0\0\0\0", 16) = 8 <0.000009>
[pid 2750] 1682218613.848641 sendmsg(6, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="l\2\1\1\234R\0\0\360\232\v\0000\0\0\0\6\1s\0\6\0\0\0:1.277\0\0"..., iov_len=21212}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 21212 <0.000023>
[pid 2750] 1682218613.848742 poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}], 2, 0) = 0 (Timeout) <0.000012>
[pid 2750] 1682218613.848992 poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}], 2, -1) = 1 ([{fd=6, revents=POLLIN}]) <0.000572>
[pid 2750] 1682218613.849633 write(7, "\1\0\0\0\0\0\0\0", 8) = 8 <0.000014>
[pid 2750] 1682218613.849702 recvmsg(6, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="l\1\0\1\0\0\0\0\255h\4\0\247\0\0\0", iov_len=16}], msg_iovlen=1, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 16 <0.000013>
[pid 2750] 1682218613.849784 poll([{fd=6, events=POLLIN}], 1, 0) = 1 ([{fd=6, revents=POLLIN}]) <0.000014>
[pid 2750] 1682218613.849857 recvmsg(6, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\1\1o\0\30\0\0\0/org/freedesktop/UDisks2"..., iov_len=168}], msg_iovlen=1, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 168 <0.000016>
[pid 2750] 1682218613.849942 write(7, "\1\0\0\0\0\0\0\0", 8) = 8 <0.000014>
[pid 2750] 1682218613.850010 write(7, "\1\0\0\0\0\0\0\0", 8) = 8 <0.000014>
[pid 2750] 1682218613.850081 poll([{fd=7, events=POLLIN}], 1, 0) = 1 ([{fd=7, revents=POLLIN}]) <0.000014>
[pid 2750] 1682218613.850154 read(7, "\3\0\0\0\0\0\0\0", 16) = 8 <0.000017>
[pid 2750] 1682218613.850248 write(4, "\1\0\0\0\0\0\0\0", 8) = 8 <0.000018>
[pid 2716] 1682218613.850310 <... poll resumed>) = 1 ([{fd=4, revents=POLLIN}]) <0.001751>
[pid 2750] 1682218613.850348 poll([{fd=6, events=POLLIN}], 1, 0 <unfinished ...>
[pid 2716] 1682218613.850394 read(4, <unfinished ...>
[pid 2750] 1682218613.850424 <... poll resumed>) = 0 (Timeout) <0.000042>
[pid 2716] 1682218613.850456 <... read resumed>"\1\0\0\0\0\0\0\0", 16) = 8 <0.000041>
[pid 2750] 1682218613.850493 write(7, "\1\0\0\0\0\0\0\0", 8) = 8 <0.000016>
[pid 2750] 1682218613.850565 futex(0x55e5b77aa070, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 2716] 1682218613.850597 futex(0x55e5b77aa070, FUTEX_WAIT_PRIVATE, 2, NULL <unfinished ...>
[pid 2750] 1682218613.850637 <... futex resumed>) = 0 <0.000044>
[pid 2716] 1682218613.850663 <... futex resumed>) = -1 EAGAIN (Resource temporarily unavailable) <0.000044>
[pid 2750] 1682218613.850700 poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}], 2, -1 <unfinished ...>
[pid 2716] 1682218613.850738 futex(0x55e5b77aa070, FUTEX_WAKE_PRIVATE, 1 <unfinished ...>
[pid 2750] 1682218613.850779 <... poll resumed>) = 1 ([{fd=7, revents=POLLIN}]) <0.000044>
[pid 2716] 1682218613.850810 <... futex resumed>) = 0 <0.000049>
[pid 2750] 1682218613.850842 read(7, "\1\0\0\0\0\0\0\0", 16) = 8 <0.000014>
[pid 2750] 1682218613.850909 poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}], 2, -1 <unfinished ...>
[pid 2716] 1682218613.852133 write(7, "\1\0\0\0\0\0\0\0", 8) = 8 <0.000014>
[pid 2750] 1682218613.852200 <... poll resumed>) = 1 ([{fd=7, revents=POLLIN}]) <0.001262>
[pid 2716] 1682218613.852243 poll([{fd=4, events=POLLIN}, {fd=8, events=0}, {fd=9, events=0}, {fd=11, events=POLLIN}, {fd=13, events=POLLIN}, {fd=14, events=0}], 6, 176034 <unfinished ...>
[pid 2750] 1682218613.852282 read(7, "\1\0\0\0\0\0\0\0", 16) = 8 <0.000019>
[pid 2750] 1682218613.852372 sendmsg(6, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="l\2\1\1\234R\0\0\361\232\v\0000\0\0\0\6\1s\0\6\0\0\0:1.277\0\0"..., iov_len=21212}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, MSG_NOSIGNAL) = 21212 <0.000022>
[pid 2750] 1682218613.852469 poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}], 2, 0) = 0 (Timeout) <0.000015>
[pid 2750] 1682218613.852722 poll([{fd=6, events=POLLIN}, {fd=7, events=POLLIN}], 2, -1) = 1 ([{fd=6, revents=POLLIN}]) <0.025108>
[pid 2750] 1682218613.877951 write(7, "\1\0\0\0\0\0\0\0", 8) = 8 <0.000023>
[pid 2750] 1682218613.878068 recvmsg(6, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="l\1\0\1\0\0\0\0\256h\4\0\247\0\0\0", iov_len=16}], msg_iovlen=1, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 16 <0.000018>
[pid 2750] 1682218613.878187 poll([{fd=6, events=POLLIN}], 1, 0) = 1 ([{fd=6, revents=POLLIN}]) <0.000014>
[pid 2750] 1682218613.878263 recvmsg(6, {msg_name=NULL, msg_namelen=0, msg_iov=[{iov_base="\1\1o\0\30\0\0\0/org/freedesktop/UDisks2"..., iov_len=168}], msg_iovlen=1, msg_controllen=0, msg_flags=MSG_CMSG_CLOEXEC}, MSG_CMSG_CLOEXEC) = 168 <0.000018>
[pid 2750] 1682218613.878356 write(7, "\1\0\0\0\0\0\0\0", 8) = 8 <0.000014>
[pid 2750] 1682218613.878429 write(7, "\1\0\0\0\0\0\0\0", 8) = 8 <0.000014>
[pid 2750] 1682218613.878506 poll([{fd=7, events=POLLIN}], 1, 0) = 1 ([{fd=7, revents=POLLIN}]) <0.000014>
[pid 2750] 1682218613.878578 read(7, "\3\0\0\0\0\0\0\0", 16) = 8 <0.000013>
[pid 2750] 1682218613.878690 write(4, "\1\0\0\0\0\0\0\0", 8) = 8 <0.000015>
[pid 2716] 1682218613.878752 <... poll resumed>) = 1 ([{fd=4, revents=POLLIN}]) <0.026479>
[pid 2750] 1682218613.878791 poll([{fd=6, events=POLLIN}], 1, 0 <unfinished ...>
[pid 2716] 1682218613.878836 read(4, <unfinished ...>
[pid 2750] 1682218613.878867 <... poll resumed>) = 0 (Timeout) <0.000043>
[pid 2716] 1682218613.878899 <... read resumed>"\1\0\0\0\0\0\0\0", 16) = 8 <0.000041>