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Date: Thu, 14 May 2020 18:01:32 -0700 (PDT) From: David Miller <davem@...emloft.net> To: frextrite@...il.com Cc: kuznet@....inr.ac.ru, yoshfuji@...ux-ipv6.org, kuba@...nel.org, kaber@...sh.net, sfr@...b.auug.org.au, cai@....pw, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, linux-kernel-mentees@...ts.linuxfoundation.org, joel@...lfernandes.org, madhuparnabhowmik10@...il.com, paulmck@...nel.org, syzbot+1519f497f2f9f08183c6@...kaller.appspotmail.com Subject: Re: [PATCH net v2 2/2] ipmr: Add lockdep expression to ipmr_for_each_table macro From: Amol Grover <frextrite@...il.com> Date: Thu, 14 May 2020 23:31:03 +0530 > During the initialization process, ipmr_new_table() is called > to create new tables which in turn calls ipmr_get_table() which > traverses net->ipv4.mr_tables without holding the writer lock. > However, this is safe to do so as no tables exist at this time. > Hence add a suitable lockdep expression to silence the following > false-positive warning: > > ============================= > WARNING: suspicious RCU usage > 5.7.0-rc3-next-20200428-syzkaller #0 Not tainted > ----------------------------- > net/ipv4/ipmr.c:136 RCU-list traversed in non-reader section!! > > ipmr_get_table+0x130/0x160 net/ipv4/ipmr.c:136 > ipmr_new_table net/ipv4/ipmr.c:403 [inline] > ipmr_rules_init net/ipv4/ipmr.c:248 [inline] > ipmr_net_init+0x133/0x430 net/ipv4/ipmr.c:3089 > > Fixes: f0ad0860d01e ("ipv4: ipmr: support multiple tables") > Reported-by: syzbot+1519f497f2f9f08183c6@...kaller.appspotmail.com > Suggested-by: Jakub Kicinski <kuba@...nel.org> > Signed-off-by: Amol Grover <frextrite@...il.com> Applied.
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