48 lines
1.5 KiB
Markdown
48 lines
1.5 KiB
Markdown
```shell
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pm=$(pgrep -u postgres -xo postgres)
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sudo strace -ff -f -yy -s 256 \
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-e trace=%file,read,pread64,readv \
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-p "$pm" -o /tmp/pg.sys.trace
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strace: Process 233035 attached
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strace: Process 235357 attached
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^Cstrace: Process 233035 detached
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fatal_pid=$(grep 'FATAL: "pg_tblspc' /tmp/pg.log | tail -1 | sed -n 's/.*\[\([0-9]\+\)\].*/\1/p'); echo "fatal_pid=$fatal_pid"
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fatal_pid=235357
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grep -n "PG_VERSION\|pg_tblspc/16384/PG_12_201909212/16385" /tmp/pg.sys.trace.$fatal_pid
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18:access("pg_tblspc/16384/PG_12_201909212/16385", F_OK) = 0
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19:openat(AT_FDCWD, "pg_tblspc/16384/PG_12_201909212/16385/PG_VERSION", O_RDONLY) = 4</zvfs/pg_ts_bench/PG_12_201909212/16385/PG_VERSION>
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20:read(4</zvfs/pg_ts_bench/PG_12_201909212/16385/PG_VERSION>, "\0\0\0", 4096) = 3
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21:read(4</zvfs/pg_ts_bench/PG_12_201909212/16385/PG_VERSION>, "", 4096) = 0
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fatal_pid=$(grep 'FATAL: "pg_tblspc' /tmp/pg.log | tail -1 | sed -n 's/.*\[\([0-9]\+\)\].*/\1/p'); echo "fatal_pid=$fatal_pid"
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grep -n "\[zvfs\]\[rw-dbg\].*pid=${fatal_pid}" /tmp/pg.log | tail -n 120
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6461:[zvfs][rw-dbg][pid=235357][tid=140193133607488][fd=4] read passthrough reason=fd_not_zvfs count=512
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6462:[zvfs][rw-dbg][pid=235357][tid=140193133607488][fd=4] read passthrough ret=512 errno=0(OK)
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```
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```shell
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sudo strace -ff -f -k -yy -s 256 -e trace=openat,read,pread64 -p "$pm" -o /tmp/pg.ktrace
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```
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调用链：
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libc(__open64) -> _IO_file_open -> fopen -> AllocateFile -> ValidatePgVersion
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是fopen，内部调用 libc_(__open64)
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