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input_thread: mixing input threads and coroutines leads to a crash #7061

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edsiper opened this issue Mar 23, 2023 · 5 comments
Closed

input_thread: mixing input threads and coroutines leads to a crash #7061

edsiper opened this issue Mar 23, 2023 · 5 comments
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bug
Milestone
Fluent Bit v2.1.5

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@edsiper
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edsiper commented Mar 23, 2023

Bug Report

When an input plugin by configuration or flags set in the code uses coroutines and runs in a separate thread, there is a high chance it would crash. It seems to be related to the coroutines context handling inside the thread.

The easiest way to reproduce the issue is with this configuration (after #7060 gets merged in GIT master):

[SERVICE]
    Flush        0.5
    Daemon       Off
    Log_Level    info
    http_server  on
    http_listen  127.0.0.1
    http_port    2020

[INPUT]
    name  event_type
    type  logs
    interval_sec 0
    interval_nsec 500

[INPUT]
    name  event_type
    type  metrics
    interval_sec 0
    interval_nsec 500

[OUTPUT]
    Name  vivo_exporter
    Match *

the output:

[2023/03/23 19:39:21] [ info] [input:event_type:event_type.0] [OK] collector_time
[2023/03/23 19:39:21] [ info] [input:event_type:event_type.0] [OK] collector_time
[2023/03/23 19:39:21] [ info] [input:event_type:event_type.1] [OK] collector_time
[2023/03/23 19:39:21] [ info] [input:event_type:event_type.0] [OK] collector_time
[2023/03/23 19:39:21] [ info] [input:event_type:event_type.0] [OK] collector_time
[2023/03/23 19:39:21] [engine] caught signal (SIGSEGV)
*** stack smashing detected ***: terminated
[2023/03/23 19:39:21] [ info] [input:event_type:event_type.0] [OK] collector_time
Aborted (core dumped)
@edsiper edsiper added this to the Fluent Bit v2.1.0 milestone Mar 23, 2023
@nokute78
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Invalid handle was passed to co_switch and it caused crashing fluent-bit.

Disasemble/Backtrace

Following disasemble results points invalid reading a address 0x42b564e167fe6291 caused crash.
The address is pointed by rdi.

(gdb) disass
Dump of assembler code for function co_swap_function:
   0x0000555555f84ce0 <+0>:	mov    %rsp,(%rsi)
=> 0x0000555555f84ce3 <+3>:	mov    (%rdi),%rsp
   0x0000555555f84ce6 <+6>:	pop    %rax

(gdb) bt
#0  0x0000555555f84ce3 in co_swap_function ()
#1  0x0000555555f85ee9 in co_switch (handle=0x42b564e167fe6291)
    at /home/taka/git/fluent-bit/lib/monkey/deps/flb_libco/amd64.c:158
#2  0x000055555561b24a in input_pre_cb_collect () at /home/taka/git/fluent-bit/include/fluent-bit/flb_input.h:485
#3  0x0000555555f85ceb in co_init () at /home/taka/git/fluent-bit/lib/monkey/deps/flb_libco/amd64.c:117
#4  0x0000000000006210 in ?? ()

Registers

rdi is 0x42b564e167fe6291.
It is same value 0x0000555555f85ee9 in co_switch (handle=0x42b564e167fe6291) from backtrace.

(gdb) info register
rax            0x42b564e167fe6291  4806859096563016337
rbx            0x7fffaa00a950      140736045558096
rcx            0x0                 0
rdx            0x42b564e167fe6291  4806859096563016337
rsi            0x7fffaa00a950      140736045558096
rdi            0x42b564e167fe6291  4806859096563016337
rbp            0x7fffaa010b10      0x7fffaa010b10
rsp            0x7fffaa010ae8      0x7fffaa010ae8
r8             0x0                 0
r9             0x7fffaa00a950      140736045558096
r10            0x7fffec0004a0      140737152812192
r11            0x7fffec000090      140737152811152
r12            0x555555f84ce0      93825002917088
r13            0x0                 0
r14            0x0                 0
r15            0x0                 0
rip            0x555555f84ce3      0x555555f84ce3 <co_swap_function+3>
eflags         0x10206             [ PF IF RF ]
cs             0x33                51
ss             0x2b                43
ds             0x0                 0
es             0x0                 0
fs             0x0                 0
gs             0x0                 0

Memory map

Following is a memory map of fluent-bit.
0x42b564e167fe6291 is out of range.

(gdb) info proc map
process 28061
Mapped address spaces:

          Start Addr           End Addr       Size     Offset  Perms  objfile
      0x555555554000     0x5555555cf000    0x7b000        0x0  r--p   /home/taka/git/fluent-bit/build/bin/fluent-bit
      0x5555555cf000     0x555555f89000   0x9ba000    0x7b000  r-xp   /home/taka/git/fluent-bit/build/bin/fluent-bit
      0x555555f89000     0x55555622c000   0x2a3000   0xa35000  r--p   /home/taka/git/fluent-bit/build/bin/fluent-bit
      0x55555622d000     0x55555623d000    0x10000   0xcd8000  r--p   /home/taka/git/fluent-bit/build/bin/fluent-bit
      0x55555623d000     0x55555625d000    0x20000   0xce8000  rw-p   /home/taka/git/fluent-bit/build/bin/fluent-bit
      0x55555625d000     0x5555562a2000    0x45000        0x0  rw-p   [heap]
      0x7fffa4000000     0x7fffaa013000  0x6013000        0x0  rw-p   
      0x7fffaa013000     0x7fffac000000  0x1fed000        0x0  ---p   
      0x7fffac000000     0x7fffb3ffd000  0x7ffd000        0x0  rw-p   
      0x7fffb3ffd000     0x7fffb4000000     0x3000        0x0  ---p   
      0x7fffb4000000     0x7fffbc000000  0x8000000        0x0  rw-p   
      0x7fffbc000000     0x7fffc3ffc000  0x7ffc000        0x0  rw-p   
      0x7fffc3ffc000     0x7fffc4000000     0x4000        0x0  ---p   
      0x7fffc4000000     0x7fffc7ffe000  0x3ffe000        0x0  rw-p   
      0x7fffc7ffe000     0x7fffc8000000     0x2000        0x0  ---p   
      0x7fffc8000000     0x7fffcc000000  0x4000000        0x0  rw-p   
      0x7fffcc000000     0x7fffcc021000    0x21000        0x0  rw-p   
      0x7fffcc021000     0x7fffd0000000  0x3fdf000        0x0  ---p   
      0x7fffd0000000     0x7fffd4000000  0x4000000        0x0  rw-p   
      0x7fffd4000000     0x7fffd5568000  0x1568000        0x0  rw-p   
      0x7fffd5568000     0x7fffd8000000  0x2a98000        0x0  ---p   
      0x7fffd8000000     0x7fffd8021000    0x21000        0x0  rw-p   
      0x7fffd8021000     0x7fffdc000000  0x3fdf000        0x0  ---p   
      0x7fffdc000000     0x7fffdc021000    0x21000        0x0  rw-p   
      0x7fffdc021000     0x7fffe0000000  0x3fdf000        0x0  ---p   
      0x7fffe0000000     0x7fffe0021000    0x21000        0x0  rw-p   
      0x7fffe0021000     0x7fffe4000000  0x3fdf000        0x0  ---p   
      0x7fffe57fb000     0x7fffe57fc000     0x1000        0x0  ---p   
      0x7fffe57fc000     0x7fffe5ffc000   0x800000        0x0  rwxp   
      0x7fffe5ffc000     0x7fffe5ffd000     0x1000        0x0  ---p   
      0x7fffe5ffd000     0x7fffe67fd000   0x800000        0x0  rwxp   
      0x7fffe67fd000     0x7fffe67fe000     0x1000        0x0  ---p   
      0x7fffe67fe000     0x7fffe6ffe000   0x800000        0x0  rwxp   
      0x7fffe6ffe000     0x7fffe6fff000     0x1000        0x0  ---p   
      0x7fffe6fff000     0x7fffe77ff000   0x800000        0x0  rwxp   
      0x7fffe77ff000     0x7fffe7800000     0x1000        0x0  ---p   
      0x7fffe7800000     0x7fffe8000000   0x800000        0x0  rwxp   
      0x7fffe8000000     0x7fffe8021000    0x21000        0x0  rw-p   
      0x7fffe8021000     0x7fffec000000  0x3fdf000        0x0  ---p   
      0x7fffec000000     0x7ffff0000000  0x4000000        0x0  rw-p   
      0x7ffff0000000     0x7ffff0783000   0x783000        0x0  rw-p   
      0x7ffff0783000     0x7ffff4000000  0x387d000        0x0  ---p   
      0x7ffff42bc000     0x7ffff42bd000     0x1000        0x0  ---p   
      0x7ffff42bd000     0x7ffff4abd000   0x800000        0x0  rwxp   
      0x7ffff4abd000     0x7ffff4abe000     0x1000        0x0  ---p   
      0x7ffff4abe000     0x7ffff52be000   0x800000        0x0  rwxp   
      0x7ffff52be000     0x7ffff52bf000     0x1000        0x0  ---p   
      0x7ffff52bf000     0x7ffff5abf000   0x800000        0x0  rwxp   
      0x7ffff5abf000     0x7ffff5ac0000     0x1000        0x0  ---p   
      0x7ffff5ac0000     0x7ffff62c0000   0x800000        0x0  rwxp   
      0x7ffff62c0000     0x7ffff62c1000     0x1000        0x0  ---p   
      0x7ffff62c1000     0x7ffff6ac1000   0x800000        0x0  rwxp   
      0x7ffff6ac1000     0x7ffff6ac2000     0x1000        0x0  ---p   
      0x7ffff6ac2000     0x7ffff72c2000   0x800000        0x0  rwxp   
      0x7ffff72c2000     0x7ffff72d1000     0xf000        0x0  r--p   /usr/lib/x86_64-linux-gnu/libgcrypt.so.20.3.4
      0x7ffff72d1000     0x7ffff73b7000    0xe6000     0xf000  r-xp   /usr/lib/x86_64-linux-gnu/libgcrypt.so.20.3.4
      0x7ffff73b7000     0x7ffff73f5000    0x3e000    0xf5000  r--p   /usr/lib/x86_64-linux-gnu/libgcrypt.so.20.3.4
      0x7ffff73f5000     0x7ffff73f6000     0x1000   0x133000  ---p   /usr/lib/x86_64-linux-gnu/libgcrypt.so.20.3.4
      0x7ffff73f6000     0x7ffff73f9000     0x3000   0x133000  r--p   /usr/lib/x86_64-linux-gnu/libgcrypt.so.20.3.4
      0x7ffff73f9000     0x7ffff73ff000     0x6000   0x136000  rw-p   /usr/lib/x86_64-linux-gnu/libgcrypt.so.20.3.4
      0x7ffff73ff000     0x7ffff7400000     0x1000        0x0  rw-p   
      0x7ffff7400000     0x7ffff7428000    0x28000        0x0  r--p   /usr/lib/x86_64-linux-gnu/libc.so.6
      0x7ffff7428000     0x7ffff75bd000   0x195000    0x28000  r-xp   /usr/lib/x86_64-linux-gnu/libc.so.6
      0x7ffff75bd000     0x7ffff7615000    0x58000   0x1bd000  r--p   /usr/lib/x86_64-linux-gnu/libc.so.6
      0x7ffff7615000     0x7ffff7619000     0x4000   0x214000  r--p   /usr/lib/x86_64-linux-gnu/libc.so.6
      0x7ffff7619000     0x7ffff761b000     0x2000   0x218000  rw-p   /usr/lib/x86_64-linux-gnu/libc.so.6
      0x7ffff761b000     0x7ffff7628000     0xd000        0x0  rw-p   
      0x7ffff7731000     0x7ffff773b000     0xa000        0x0  r--p   /usr/lib/x86_64-linux-gnu/libzstd.so.1.4.8
      0x7ffff773b000     0x7ffff77ed000    0xb2000     0xa000  r-xp   /usr/lib/x86_64-linux-gnu/libzstd.so.1.4.8
      0x7ffff77ed000     0x7ffff77fe000    0x11000    0xbc000  r--p   /usr/lib/x86_64-linux-gnu/libzstd.so.1.4.8
      0x7ffff77fe000     0x7ffff77ff000     0x1000    0xcc000  r--p   /usr/lib/x86_64-linux-gnu/libzstd.so.1.4.8
      0x7ffff77ff000     0x7ffff7800000     0x1000    0xcd000  rw-p   /usr/lib/x86_64-linux-gnu/libzstd.so.1.4.8
      0x7ffff7800000     0x7ffff78b2000    0xb2000        0x0  r--p   /usr/lib/x86_64-linux-gnu/libcrypto.so.3
      0x7ffff78b2000     0x7ffff7b10000   0x25e000    0xb2000  r-xp   /usr/lib/x86_64-linux-gnu/libcrypto.so.3
      0x7ffff7b10000     0x7ffff7be2000    0xd2000   0x310000  r--p   /usr/lib/x86_64-linux-gnu/libcrypto.so.3
      0x7ffff7be2000     0x7ffff7c3d000    0x5b000   0x3e1000  r--p   /usr/lib/x86_64-linux-gnu/libcrypto.so.3
      0x7ffff7c3d000     0x7ffff7c40000     0x3000   0x43c000  rw-p   /usr/lib/x86_64-linux-gnu/libcrypto.so.3
      0x7ffff7c40000     0x7ffff7c43000     0x3000        0x0  rw-p   
      0x7ffff7c96000     0x7ffff7c98000     0x2000        0x0  rw-p   
      0x7ffff7c98000     0x7ffff7c9c000     0x4000        0x0  r--p   /usr/lib/x86_64-linux-gnu/libgpg-error.so.0.32.1
      0x7ffff7c9c000     0x7ffff7cb2000    0x16000     0x4000  r-xp   /usr/lib/x86_64-linux-gnu/libgpg-error.so.0.32.1
      0x7ffff7cb2000     0x7ffff7cbc000     0xa000    0x1a000  r--p   /usr/lib/x86_64-linux-gnu/libgpg-error.so.0.32.1
      0x7ffff7cbc000     0x7ffff7cbd000     0x1000    0x23000  r--p   /usr/lib/x86_64-linux-gnu/libgpg-error.so.0.32.1
      0x7ffff7cbd000     0x7ffff7cbe000     0x1000    0x24000  rw-p   /usr/lib/x86_64-linux-gnu/libgpg-error.so.0.32.1
      0x7ffff7cbe000     0x7ffff7cc0000     0x2000        0x0  rw-p   
      0x7ffff7cc0000     0x7ffff7cc3000     0x3000        0x0  r--p   /usr/lib/x86_64-linux-gnu/libcap.so.2.44
      0x7ffff7cc3000     0x7ffff7cc7000     0x4000     0x3000  r-xp   /usr/lib/x86_64-linux-gnu/libcap.so.2.44
      0x7ffff7cc7000     0x7ffff7cc9000     0x2000     0x7000  r--p   /usr/lib/x86_64-linux-gnu/libcap.so.2.44
      0x7ffff7cc9000     0x7ffff7cca000     0x1000     0x8000  r--p   /usr/lib/x86_64-linux-gnu/libcap.so.2.44
      0x7ffff7cca000     0x7ffff7ccb000     0x1000     0x9000  rw-p   /usr/lib/x86_64-linux-gnu/libcap.so.2.44
      0x7ffff7ccb000     0x7ffff7ccd000     0x2000        0x0  r--p   /usr/lib/x86_64-linux-gnu/liblz4.so.1.9.3
      0x7ffff7ccd000     0x7ffff7ce6000    0x19000     0x2000  r-xp   /usr/lib/x86_64-linux-gnu/liblz4.so.1.9.3
      0x7ffff7ce6000     0x7ffff7ce8000     0x2000    0x1b000  r--p   /usr/lib/x86_64-linux-gnu/liblz4.so.1.9.3
      0x7ffff7ce8000     0x7ffff7ce9000     0x1000    0x1d000  ---p   /usr/lib/x86_64-linux-gnu/liblz4.so.1.9.3
      0x7ffff7ce9000     0x7ffff7cea000     0x1000    0x1d000  r--p   /usr/lib/x86_64-linux-gnu/liblz4.so.1.9.3
      0x7ffff7cea000     0x7ffff7ceb000     0x1000    0x1e000  rw-p   /usr/lib/x86_64-linux-gnu/liblz4.so.1.9.3
      0x7ffff7ceb000     0x7ffff7cee000     0x3000        0x0  r--p   /usr/lib/x86_64-linux-gnu/liblzma.so.5.2.5
      0x7ffff7cee000     0x7ffff7d09000    0x1b000     0x3000  r-xp   /usr/lib/x86_64-linux-gnu/liblzma.so.5.2.5
      0x7ffff7d09000     0x7ffff7d14000     0xb000    0x1e000  r--p   /usr/lib/x86_64-linux-gnu/liblzma.so.5.2.5
      0x7ffff7d14000     0x7ffff7d15000     0x1000    0x28000  r--p   /usr/lib/x86_64-linux-gnu/liblzma.so.5.2.5
      0x7ffff7d15000     0x7ffff7d16000     0x1000    0x29000  rw-p   /usr/lib/x86_64-linux-gnu/liblzma.so.5.2.5
      0x7ffff7d16000     0x7ffff7d18000     0x2000        0x0  rw-p   
      0x7ffff7d18000     0x7ffff7d1b000     0x3000        0x0  r--p   /usr/lib/x86_64-linux-gnu/libgcc_s.so.1
      0x7ffff7d1b000     0x7ffff7d32000    0x17000     0x3000  r-xp   /usr/lib/x86_64-linux-gnu/libgcc_s.so.1
      0x7ffff7d32000     0x7ffff7d36000     0x4000    0x1a000  r--p   /usr/lib/x86_64-linux-gnu/libgcc_s.so.1
      0x7ffff7d36000     0x7ffff7d37000     0x1000    0x1d000  r--p   /usr/lib/x86_64-linux-gnu/libgcc_s.so.1
      0x7ffff7d37000     0x7ffff7d38000     0x1000    0x1e000  rw-p   /usr/lib/x86_64-linux-gnu/libgcc_s.so.1
      0x7ffff7d38000     0x7ffff7d4b000    0x13000        0x0  r--p   /usr/lib/x86_64-linux-gnu/libsystemd.so.0.32.0
      0x7ffff7d4b000     0x7ffff7dca000    0x7f000    0x13000  r-xp   /usr/lib/x86_64-linux-gnu/libsystemd.so.0.32.0
      0x7ffff7dca000     0x7ffff7df5000    0x2b000    0x92000  r--p   /usr/lib/x86_64-linux-gnu/libsystemd.so.0.32.0
      0x7ffff7df5000     0x7ffff7df6000     0x1000    0xbd000  ---p   /usr/lib/x86_64-linux-gnu/libsystemd.so.0.32.0
      0x7ffff7df6000     0x7ffff7dfd000     0x7000    0xbd000  r--p   /usr/lib/x86_64-linux-gnu/libsystemd.so.0.32.0
      0x7ffff7dfd000     0x7ffff7dfe000     0x1000    0xc4000  rw-p   /usr/lib/x86_64-linux-gnu/libsystemd.so.0.32.0
      0x7ffff7dfe000     0x7ffff7dff000     0x1000        0x0  rw-p   
      0x7ffff7dff000     0x7ffff7e01000     0x2000        0x0  r--p   /usr/lib/x86_64-linux-gnu/libyaml-0.so.2.0.6
      0x7ffff7e01000     0x7ffff7e1a000    0x19000     0x2000  r-xp   /usr/lib/x86_64-linux-gnu/libyaml-0.so.2.0.6
      0x7ffff7e1a000     0x7ffff7e1e000     0x4000    0x1b000  r--p   /usr/lib/x86_64-linux-gnu/libyaml-0.so.2.0.6
      0x7ffff7e1e000     0x7ffff7e1f000     0x1000    0x1e000  r--p   /usr/lib/x86_64-linux-gnu/libyaml-0.so.2.0.6
      0x7ffff7e1f000     0x7ffff7e20000     0x1000    0x1f000  rw-p   /usr/lib/x86_64-linux-gnu/libyaml-0.so.2.0.6
      0x7ffff7e20000     0x7ffff7e3e000    0x1e000        0x0  r--p   /usr/lib/x86_64-linux-gnu/libssl.so.3
      0x7ffff7e3e000     0x7ffff7e99000    0x5b000    0x1e000  r-xp   /usr/lib/x86_64-linux-gnu/libssl.so.3
      0x7ffff7e99000     0x7ffff7eb6000    0x1d000    0x79000  r--p   /usr/lib/x86_64-linux-gnu/libssl.so.3
      0x7ffff7eb6000     0x7ffff7ec0000     0xa000    0x95000  r--p   /usr/lib/x86_64-linux-gnu/libssl.so.3
      0x7ffff7ec0000     0x7ffff7ec4000     0x4000    0x9f000  rw-p   /usr/lib/x86_64-linux-gnu/libssl.so.3
      0x7ffff7ec4000     0x7ffff7ed2000     0xe000        0x0  r--p   /usr/lib/x86_64-linux-gnu/libm.so.6
      0x7ffff7ed2000     0x7ffff7f4e000    0x7c000     0xe000  r-xp   /usr/lib/x86_64-linux-gnu/libm.so.6
      0x7ffff7f4e000     0x7ffff7fa9000    0x5b000    0x8a000  r--p   /usr/lib/x86_64-linux-gnu/libm.so.6
      0x7ffff7fa9000     0x7ffff7faa000     0x1000    0xe4000  r--p   /usr/lib/x86_64-linux-gnu/libm.so.6
      0x7ffff7faa000     0x7ffff7fab000     0x1000    0xe5000  rw-p   /usr/lib/x86_64-linux-gnu/libm.so.6
      0x7ffff7fbb000     0x7ffff7fbd000     0x2000        0x0  rw-p   
      0x7ffff7fbd000     0x7ffff7fc1000     0x4000        0x0  r--p   [vvar]
      0x7ffff7fc1000     0x7ffff7fc3000     0x2000        0x0  r-xp   [vdso]
      0x7ffff7fc3000     0x7ffff7fc5000     0x2000        0x0  r--p   /usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2
      0x7ffff7fc5000     0x7ffff7fef000    0x2a000     0x2000  r-xp   /usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2
      0x7ffff7fef000     0x7ffff7ffa000     0xb000    0x2c000  r--p   /usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2
      0x7ffff7ffa000     0x7ffff7ffb000     0x1000        0x0  rw-p   
      0x7ffff7ffb000     0x7ffff7ffd000     0x2000    0x37000  r--p   /usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2
      0x7ffff7ffd000     0x7ffff7fff000     0x2000    0x39000  rw-p   /usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2
      0x7ffffffde000     0x7ffffffff000    0x21000        0x0  rwxp   [stack]
  0xffffffffff600000 0xffffffffff601000     0x1000        0x0  --xp   [vsyscall]

@nokute78
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nokute78 commented Apr 1, 2023 •
edited
Loading

The root cause is a race of libco_in_param.
I added a mutex and it doesn't cause SIGSEGV.
But it affected fluent-bit didn't exit when user sents Ctrl+C(SIGINT)...

https://github.com/nokute78/fluent-bit/tree/fix_7061

nokute78 added a commit to nokute78/fluent-bit that referenced this issue Apr 1, 2023
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input: add mutex for libco_in_param(fluent#7061)
46489e9 
Signed-off-by: Takahiro Yamashita <nokute78@gmail.com>
nokute78 added a commit to nokute78/fluent-bit that referenced this issue Apr 1, 2023
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engine: init libco_in_param_mutex(fluent#7061)
69bdba8 
Signed-off-by: Takahiro Yamashita <nokute78@gmail.com>
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nokute78 commented Apr 1, 2023

Oops following commit is a wrong. Please ignore it...
https://github.com/nokute78/fluent-bit/tree/fix_7061

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nokute78 commented Apr 1, 2023

I sent a patch #7102
It uses pthread_key to fix this issue, but many valgrind errors were reported.

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edsiper commented Jun 14, 2023

fixed in #7102

@edsiper edsiper closed this as completed Jun 14, 2023
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