write architecture document #3
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rjarry
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The docstring of event_base_foreach_event() states explicitly that modifying events in the callback function is unsafe and will cause crashes. event_free_finalize tries to acquire a lock that is already held when the callback is called. Leading to a deadlock: (gdb) bt ... DPDK#3 ___pthread_mutex_lock (mutex=0x504000001550) at pthread_mutex_lock.c:93 DPDK#4 0x00007f3f211b8485 in event_finalize_impl_ (flags=65536, ev=0x50c000005200, cb=0x4031ba <finalize_fd>) DPDK#5 0x00000000004042ed in close_connections (ev=0x50c000005200) at main/api.c:174 ... DPDK#10 0x00007f3f211b263a in event_base_foreach_event (base=0x517000006d00, fn=0x40429f <close_connections>, arg=0x0) DPDK#11 0x0000000000404a3a in api_socket_stop () at main/api.c:253 DPDK#12 0x00000000004072aa in main (argc=4, argv=0x7ffcc575d898) at main/main.c:210 Only use event_base_foreach_event() for iterating over the events that we actually want to free (namely, ones that have read_cb and write_cb as callbacks). Only *after* returning from event_base_foreach_event(), call event_free_finalize on all these events. Fixes: 8653320 ("main: close active connections on shutdown") Signed-off-by: Robin Jarry <[email protected]>
rjarry
added a commit
to rjarry/grout
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Dec 6, 2024
The docstring of event_base_foreach_event() states explicitly that modifying events in the callback function is unsafe and will cause crashes. event_free_finalize tries to acquire a lock that is already held when the callback is called. Leading to a deadlock: (gdb) bt ... DPDK#3 ___pthread_mutex_lock (mutex=0x504000001550) at pthread_mutex_lock.c:93 DPDK#4 0x00007f3f211b8485 in event_finalize_impl_ (flags=65536, ev=0x50c000005200, cb=0x4031ba <finalize_fd>) DPDK#5 0x00000000004042ed in close_connections (ev=0x50c000005200) at main/api.c:174 ... DPDK#10 0x00007f3f211b263a in event_base_foreach_event (base=0x517000006d00, fn=0x40429f <close_connections>, arg=0x0) DPDK#11 0x0000000000404a3a in api_socket_stop () at main/api.c:253 DPDK#12 0x00000000004072aa in main (argc=4, argv=0x7ffcc575d898) at main/main.c:210 Only use event_base_foreach_event() for iterating over the events that we actually want to free (namely, ones that have read_cb and write_cb as callbacks). Only *after* returning from event_base_foreach_event(), call event_free_finalize on all these events. Fixes: 8653320 ("main: close active connections on shutdown") Signed-off-by: Robin Jarry <[email protected]>
rjarry
added a commit
that referenced
this issue
Dec 6, 2024
The docstring of event_base_foreach_event() states explicitly that modifying events in the callback function is unsafe and will cause crashes. event_free_finalize tries to acquire a lock that is already held when the callback is called. Leading to a deadlock: (gdb) bt ... #3 ___pthread_mutex_lock (mutex=0x504000001550) at pthread_mutex_lock.c:93 #4 0x00007f3f211b8485 in event_finalize_impl_ (flags=65536, ev=0x50c000005200, cb=0x4031ba <finalize_fd>) #5 0x00000000004042ed in close_connections (ev=0x50c000005200) at main/api.c:174 ... #10 0x00007f3f211b263a in event_base_foreach_event (base=0x517000006d00, fn=0x40429f <close_connections>, arg=0x0) #11 0x0000000000404a3a in api_socket_stop () at main/api.c:253 #12 0x00000000004072aa in main (argc=4, argv=0x7ffcc575d898) at main/main.c:210 Only use event_base_foreach_event() for iterating over the events that we actually want to free (namely, ones that have read_cb and write_cb as callbacks). Only *after* returning from event_base_foreach_event(), call event_free_finalize on all these events. Fixes: 8653320 ("main: close active connections on shutdown") Signed-off-by: Robin Jarry <[email protected]>
rjarry
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to rjarry/grout
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Feb 20, 2025
grout# show ip6 router-advert
error: command failed: Bad message
grout# ^D
==174902==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 328 byte(s) in 1 object(s) allocated from:
#0 0x7fe0ca6c2250 in calloc (/lib64/libasan.so.8+0xc2250)
DPDK#1 0x7fe0cadef910 in scols_new_table (/lib64/libsmartcols.so.1+0x6910)
DPDK#2 0x417d0f in ra_show ../modules/ip6/cli/router_advert.c:19
DPDK#3 0x41e836 in exec_strvec ../cli/exec.c:72
DPDK#4 0x41e982 in exec_line ../cli/exec.c:106
DPDK#5 0x41f412 in interact ../cli/interact.c:119
DPDK#6 0x4216db in main ../cli/main.c:167
...
DPDK#9 0x4017f4 in _start (/root/grout/build/grcli+0x4017f4)
Only allocate the table if the GR_IP6_IFACE_RA_SHOW api call is
successful.
Fixes: 8ed8b9d ("ip6: router advertisement configuration")
Signed-off-by: Robin Jarry <[email protected]>
rjarry
added a commit
that referenced
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Feb 24, 2025
grout# show ip6 router-advert
error: command failed: Bad message
grout# ^D
==174902==ERROR: LeakSanitizer: detected memory leaks
Direct leak of 328 byte(s) in 1 object(s) allocated from:
#0 0x7fe0ca6c2250 in calloc (/lib64/libasan.so.8+0xc2250)
#1 0x7fe0cadef910 in scols_new_table (/lib64/libsmartcols.so.1+0x6910)
#2 0x417d0f in ra_show ../modules/ip6/cli/router_advert.c:19
#3 0x41e836 in exec_strvec ../cli/exec.c:72
#4 0x41e982 in exec_line ../cli/exec.c:106
#5 0x41f412 in interact ../cli/interact.c:119
#6 0x4216db in main ../cli/main.c:167
...
#9 0x4017f4 in _start (/root/grout/build/grcli+0x4017f4)
Only allocate the table if the GR_IP6_IFACE_RA_SHOW api call is
successful.
Fixes: 8ed8b9d ("ip6: router advertisement configuration")
Signed-off-by: Robin Jarry <[email protected]>
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