Thanks. At least, IPv4 tests passed (IPv4 overlapped - fails at first time, but passes on next times; on IPv6 I've got 'send_fragment: operation not permitted', I didn't look deeply because I don't use IPv6). No KASAN warnings in dmesg.

On 05.02.2019 22:28, Eric Dumazet wrote:

On 02/05/2019 12:21 PM, Andrew wrote:

I think that backport will be trivial - at least patch lays smoothly on 4.9 
(just with offsets difference).

I'll test it.

Btw, maybe there's a some test conditions to quickly check if patch helps? 
Crash is reproducible with unpredictable interval (tens of hours of quite heavy 
load).

Build your kernel with CONFIG_KASAN=y

Then run the tests Peter wrote.

4c3510483d26420d2c2c7cc075ad872286cc5932 selftests: net: ip_defrag: cover new 
IPv6 defrag behavior
3271a4821882a64214acc1bd7b173900ec70c9bf selftests: net: fix/improve ip_defrag 
selftest
bccc17118bcf3c62c947361d51760334f6602f43 selftests/net: add ipv6 tests to 
ip_defrag selftest
02c7f38b7ace9f1b2ddb7a88139127eef4cf8706 selftests/net: add ip_defrag selftest



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