socket should be closed when socket error happened during abort

[leslie-qiwa]

FD leak issue happened from time to time at our production environment. Using strace, I found many EAGAIN error on read/write when issue occured. This PR should fix some cases, will watch after new fix is deployed

Example strace logs:

read(1727, 0xc002a2e000, 517)           = -1 EAGAIN (Resource temporarily unavailable)
read(1727, 0xc0001e3c00, 1772)          = -1 EAGAIN (Resource temporarily unavailable)
write(1770, "\223\303tH\t\246\5\261p\224\0376\272\302J\27\205\217\2412\206\220\267\5\22CO\315\213\331\313P"..., 5132) = -1 EAGAIN (Resource temporarily unavailable)
write(1770, "\340,M\273\324K\27V\17\222\232-\332j\204\3618\313R\221\35\16[\267\316\304,\360r\232?m"..., 12899) = -1 EAGAIN (Resource temporarily unavailable)
write(1770, "_\20173\200\334W]aT\227\233\362LO^56\270\21\325\267%\361^\264O@\376\315\365Z"..., 5279) = -1 EAGAIN (Resource temporarily unavailable)
write(1770, "J\261\236\nK\325\354\231\312\rF'M\6\222\"v\247\317L\346tE\354Z*\251/?\254\357\214"..., 15977) = -1 EAGAIN (Resource temporarily unavailable)
write(1770, "\371\345\221\352\10\232Pa\204\253\306\\lm\271\231Y\305\314\216U\244\314\247\36\204\300\256\231\217\2727"..., 7331) = -1 EAGAIN (Resource temporarily unavailable)
write(1770, "=aFp\207\367 lJ\245\351\37\313\357\232f\333\232\344D\361\266D\223\220\312\345r\321\10J}"..., 13193) = -1 EAGAIN (Resource temporarily unavailable)
write(1770, "\315\10`\370\352\243K\314\265\270\3\260A6n\221\230Y\212V-Xp\325\231\236\350\32\207=A\25"..., 4547) = -1 EAGAIN (Resource temporarily unavailable)
write(1770, "\300\206\365\313\325{:\0052hn:\270\205\30TC\23\203\237\360\273\216\242\353\373Y)\233\211\305B"..., 8504) = -1 EAGAIN (Resource temporarily unavailable)
read(1727, 0xc0029e18c0, 517)           = -1 EAGAIN (Resource temporarily unavailable)
write(1770, "\354\243\206\270'X\\\344\323\205\247gXa\254\335a\345|\\g\232Z\307\375r\314\33\207\31l\237"..., 1910) = -1 EAGAIN (Resource temporarily unavailable)
read(1727, 0xc001f8ad80, 517)           = -1 EAGAIN (Resource temporarily unavailable)
write(1770, "\246|\230}S\24\201\202\253\242\37\216\2121t\3\366=\345#\253\342^\335?\355\243Q\254\nI\245"..., 9677) = -1 EAGAIN (Resource temporarily unavailable)
write(1770, "z^f\226\372\353\25\24\214\302\331\253\222\310|\330l\364\201n\231\275Oi$[\30\273b\244\376&"..., 12608) = -1 EAGAIN (Resource temporarily unavailable)
write(1770, "\263\326{h\204V\345\254\223\320\n\214\301\325;~\276\367\351\202\10\212\241\343\33\262\343\263\272\230\312\361"..., 6014) = -1 EAGAIN (Resource temporarily unavailable)
write(1770, "Qe\315\302\316\t\204\375\212RV\35u_\267\347N\361Xo\3\254cP{)\n\276\357.J\351"..., 11876) = -1 EAGAIN (Resource temporarily unavailable)
write(1770, "\250E\244\276\35\204\n\34\376\0-\251/\22\10\327\310\332Y\6\204P\6\307NF\3K\363\316\351\311"..., 4256) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x220fb50, FUTEX_WAIT_PRIVATE, 0, NULL) = -1 EAGAIN (Resource temporarily unavailable)
futex(0x220fb50, FUTEX_WAIT_PRIVATE, 0, NULL) = -1 EAGAIN (Resource temporarily unavailable)

[pin]

@leslie-qiwa, I think it make sense and good catch :)

The conn is supposed to be closed on abort but if sendTo of the error packet fails for some reason, we drop conn on the floor without closing it...

Merging, apology for the slow response, and thank you very much for good fix!