Re: [PATCH net] sctp: fix handling of ICMP Frag Needed for too small MTUs

2018-01-03 Thread Xin Long
On Wed, Jan 3, 2018 at 9:35 PM, Marcelo Ricardo Leitner wrote: > On Wed, Jan 03, 2018 at 03:31:00PM +0800, Xin Long wrote: >> On Wed, Jan 3, 2018 at 5:44 AM, Marcelo Ricardo Leitner >> wrote: >> > syzbot reported a hang involving SCTP, on which it kept flooding dmesg >> > with the message: >> > [

Re: [PATCH net] sctp: fix handling of ICMP Frag Needed for too small MTUs

2018-01-03 Thread Marcelo Ricardo Leitner
On Wed, Jan 03, 2018 at 03:31:00PM +0800, Xin Long wrote: > On Wed, Jan 3, 2018 at 5:44 AM, Marcelo Ricardo Leitner > wrote: > > syzbot reported a hang involving SCTP, on which it kept flooding dmesg > > with the message: > > [ 246.742374] sctp: sctp_transport_update_pmtu: Reported pmtu 508 too >

Re: [PATCH net] sctp: fix handling of ICMP Frag Needed for too small MTUs

2018-01-02 Thread Xin Long
On Wed, Jan 3, 2018 at 5:44 AM, Marcelo Ricardo Leitner wrote: > syzbot reported a hang involving SCTP, on which it kept flooding dmesg > with the message: > [ 246.742374] sctp: sctp_transport_update_pmtu: Reported pmtu 508 too > low, using default minimum of 512 > > That happened because wheneve

[PATCH net] sctp: fix handling of ICMP Frag Needed for too small MTUs

2018-01-02 Thread Marcelo Ricardo Leitner
syzbot reported a hang involving SCTP, on which it kept flooding dmesg with the message: [ 246.742374] sctp: sctp_transport_update_pmtu: Reported pmtu 508 too low, using default minimum of 512 That happened because whenever SCTP hits an ICMP Frag Needed, it tries to adjust to the new MTU and trig