Hard Lockup – might be related to FragmentSmack
Hello Folks,
My SPARC crashed while I was on holiday, and I got the messages below in
my kernel log. This happened for almost every of my 64 threads, and the
SPARC was highly unresponsive. I am wondering whether this might be
related to the FragmentSmack bug recently discovered, since it occurs in
a network-facing process, or if this is another, unrelated, possibly
sparc-specific bug.
I hope this report is of any interest.
Cheers,
Gabriel
--- Kernel log extract ---
Aug 6 20:37:37 puddlejumper kernel: [5265550.521042] WARNING: CPU: 29 PID: 76328 at /build/linux-hhlSpw/linux-4.16.5/arch/sparc/kernel/nmi.c:78 perfctr_irq+0x284/0x300
Aug 6 20:37:37 puddlejumper kernel: [5265550.521046] Watchdog detected hard LOCKUP on cpu 29
Aug 6 20:37:37 puddlejumper kernel: [5265550.521051] Modules linked in: zfs(PO) zunicode(PO) zavl(PO) icp(PO) zcommon(PO) znvpair(PO) spl(O) zlib_deflate veth fuse bridge stp llc ip6table_filter ip6_tables iptable_filter ipt_
MASQUERADE nf_nat_masquerade_ipv4 xt_nat iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_CHECKSUM xt_tcpudp iptable_mangle binfmt_misc sg n2_crypto flash des_generic n2_rng rng_core ip_tables x_
tables autofs4 ext4 crc16 mbcache jbd2 fscrypto ecb raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c crc32c_generic raid1 raid0 multipath linear md_mod ses enclosure sd_mod sr_mo
d cdrom uas usb_storage ohci_pci lpfc nvmet_fc nvme_fc mptsas ohci_hcd scsi_transport_fc ehci_pci scsi_transport_sas ehci_hcd nvmet mptscsih nvme_fabrics scsi_mod nvme_core
Aug 6 20:37:37 puddlejumper kernel: [5265550.521368] usbcore niu configfs usb_common mptbase
Aug 6 20:37:37 puddlejumper kernel: [5265550.521400] CPU: 29 PID: 76328 Comm: lighttpd Tainted: P D W O L 4.16.0-1-sparc64-smp #1 Debian 4.16.5-1
Aug 6 20:37:37 puddlejumper kernel: [5265550.521403] Call Trace:
Aug 6 20:37:37 puddlejumper kernel: [5265550.521418] [000000000046b6b0] __warn+0xd0/0x100
Aug 6 20:37:37 puddlejumper kernel: [5265550.521426] [000000000046b714] warn_slowpath_fmt+0x34/0x60
Aug 6 20:37:37 puddlejumper kernel: [5265550.521436] [0000000000a63a04] perfctr_irq+0x284/0x300
Aug 6 20:37:37 puddlejumper kernel: [5265550.521446] [00000000004209f4] tl0_irq15+0x14/0x20
Aug 6 20:37:37 puddlejumper kernel: [5265550.521451] ---[ end trace ac1e508ecf257e7b ]---
Aug 6 20:37:37 puddlejumper kernel: [5266681.842613] TCP: request_sock_TCP: Possible SYN flooding on port 80. Sending cookies. Check SNMP counters.
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