ARM64/KVM: Bad page state in process iperf

[Bhushan Bharat]

Hi All,

I am running "iperf" in KVM guest on ARM64 machine and observing below crash.

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$iperf -c 3.3.3.3 -P 4 -t 0 -i 5 -w 90k
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Client connecting to 3.3.3.3, TCP port 5001
TCP window size:  180 KByte (WARNING: requested 90.0 KByte)
------------------------------------------------------------
[  3] local 3.3.3.1 port 51131 connected with 3.3.3.3 port 5001
[  6] local 3.3.3.1 port 51134 connected with 3.3.3.3 port 5001
[  5] local 3.3.3.1 port 51133 connected with 3.3.3.3 port 5001
[  4] local 3.3.3.1 port 51132 connected with 3.3.3.3 port 5001
[   53.088567] random: nonblocking pool is initialized
[ ID] Interval       Transfer     Bandwidth
[  3]  0.0- 5.0 sec   638 MBytes  1.07 Gbits/sec
[  4] 35.0-40.0 sec  1.66 GBytes  2.85 Gbits/sec
[  5] 40.0-45.0 sec  1.11 GBytes  1.90 Gbits/sec
[  4] 40.0-45.0 sec  1.16 GBytes  1.99 Gbits/sec
[   98.895207] BUG: Bad page state in process iperf  pfn:0a584
[   98.896164] page:ffff780000296100 count:-1 mapcount:0 mapping:          (null) index:0x0
[   98.897436] flags: 0x0()
[   98.897885] page dumped because: nonzero _count
[   98.898640] Modules linked in:
[   98.899178] CPU: 0 PID: 1639 Comm: iperf Not tainted 4.1.8-00461-ge5431ad #141
[   98.900302] Hardware name: linux,dummy-virt (DT)
[   98.901014] Call trace:
[   98.901406] [<ffff800000096cac>] dump_backtrace+0x0/0x12c
[   98.902522] [<ffff800000096de8>] show_stack+0x10/0x1c
[   98.903441] [<ffff800000678dc8>] dump_stack+0x8c/0xdc
[   98.904202] [<ffff800000145480>] bad_page+0xc4/0x114
[   98.904945] [<ffff8000001487a4>] get_page_from_freelist+0x590/0x63c
[   98.905871] [<ffff80000014893c>] __alloc_pages_nodemask+0xec/0x794
[   98.906791] [<ffff80000059fc80>] skb_page_frag_refill+0x70/0xa8
[   98.907678] [<ffff80000059fcd8>] sk_page_frag_refill+0x20/0xd0
[   98.908550] [<ffff8000005edc04>] tcp_sendmsg+0x1f8/0x9a8
[   98.909368] [<ffff80000061419c>] inet_sendmsg+0x5c/0xd0
[   98.910178] [<ffff80000059bb44>] sock_sendmsg+0x14/0x58
[   98.911027] [<ffff80000059bbec>] sock_write_iter+0x64/0xbc
[   98.912119] [<ffff80000019b5b8>] __vfs_write+0xac/0x10c
[   98.913126] [<ffff80000019bcb8>] vfs_write+0x90/0x1a0
[   98.913963] [<ffff80000019c53c>] SyS_write+0x40/0xa0

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