Re: WARNING in rds_message_alloc_sgs

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On 10/30/2018 12:28 PM, syzbot wrote:
Hello,

syzbot found the following crash on:

HEAD commit:    6201f31a39f8 Add linux-next specific files for 20181030
git tree:       linux-next
console output: https://syzkaller.appspot.com/x/log.txt?x=1397d06d400000
kernel config:  https://syzkaller.appspot.com/x/.config?x=2a22859d870756c1
dashboard link: https://syzkaller.appspot.com/bug?extid=26de17458aeda9d305d8
compiler:       gcc (GCC) 8.0.1 20180413 (experimental)
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=10bb52eb400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=118bdfc5400000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+26de17458aeda9d305d8@xxxxxxxxxxxxxxxxxxxxxxxxx

WARNING: CPU: 0 PID: 19789 at net/rds/message.c:316 rds_message_alloc_sgs+0x10c/0x160 net/rds/message.c:316
Kernel panic - not syncing: panic_on_warn set ...
Looks like this kernel build has panic on warn enabled which
triggers panic for " WARN_ON(!nr_pages)" case. Will look into
it. Thanks !!

Regards,
Santosh



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