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KERN_WARN_MSG.txt
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KERN_WARN_MSG.txt
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When you use PCRE text search module with iptables on x86 Linux platfrom, the following kernel warning message could appear.
The warning message should be ignored because it is the result of the intended operation.
Because the x86 JIT code uses SSE2 instructions inside the kernel, kernel_fpu_begin()/kernel_fpu_end() must be called, which is not an usual thing for kernel modules.
The kernel prints the message when it happens to call "kernel_fpu_begin()" in softirq context.
[62016.403553] ------------[ cut here ]------------
[62016.403568] WARNING: at /usr/src/kernels/3.10.0-327.36.3.el7.x86_64/arch/x86/include/asm/i387.h:43 pcre2_jit_match_8+0x248/0x260 [libpcre2_8]()
[62016.403570] Modules linked in: ts_pcre(OE) libpcre2_8(OE) libc(OE) xt_string xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT tun bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter coretemp iTCO_wdt ppdev iTCO_vendor_support kvm_intel lpc_ich pcspkr i2c_i801 kvm mfd_core sg parport_pc parport i7core_edac edac_core ioatdma shpchp acpi_cpufreq nfsd auth_rpcgss nfs_acl lockd grace sunrpc ip_tables xfs libcrc32c sd_mod crc_t10dif crct10dif_generic crct10dif_common ata_generic pata_acpi crc32c_intel ata_piix serio_raw libata igb ptp pps_core i2c_algo_bit i2c_core dca dm_mirror dm_region_hash dm_log dm_mod [last unloaded: libc]
[62016.403624] CPU: 0 PID: 1307 Comm: redis-server Tainted: G W OE ------------ 3.10.0-327.36.3.el7.x86_64 #1
[62016.403626] Hardware name: Intel Thurley/Greencity, BIOS 080015 07/09/2010
[62016.403628] 0000000000000000 000000005b43eac9 ffff8801b9a034b8 ffffffff81636431
[62016.403632] ffff8801b9a034f0 ffffffff8107b260 ffff8800363edd6a ffff8800b633d080
[62016.403635] 0000000000000001 ffff880335e387e0 ffff88032c4778c0 ffff8801b9a03500
[62016.403638] Call Trace:
[62016.403639] <IRQ> [<ffffffff81636431>] dump_stack+0x19/0x1b
[62016.403652] [<ffffffff8107b260>] warn_slowpath_common+0x70/0xb0
[62016.403655] [<ffffffff8107b3aa>] warn_slowpath_null+0x1a/0x20
[62016.403660] [<ffffffffa04c8028>] pcre2_jit_match_8+0x248/0x260 [libpcre2_8]
[62016.403667] [<ffffffffa050826f>] pcre2_match_8+0x45f/0x12b0 [libpcre2_8]
[62016.403672] [<ffffffffa050826f>] ? pcre2_match_8+0x45f/0x12b0 [libpcre2_8]
[62016.403677] [<ffffffff8130c6dd>] ? list_del+0xd/0x30
[62016.403682] [<ffffffff81189b89>] ? zone_statistics+0x89/0xa0
[62016.403687] [<ffffffff813da9f0>] ? add_interrupt_randomness+0x50/0x1b0
[62016.403693] [<ffffffff81173327>] ? __alloc_pages_nodemask+0x197/0xba0
[62016.403697] [<ffffffff810df08f>] ? tick_broadcast_set_event+0x3f/0xc0
[62016.403700] [<ffffffff813da9f0>] ? add_interrupt_randomness+0x50/0x1b0
[62016.403704] [<ffffffffa0030000>] ? 0xffffffffa002ffff
[62016.403708] [<ffffffff8130c6dd>] ? list_del+0xd/0x30
[62016.403711] [<ffffffffa054311c>] pcre_find+0x7c/0x110 [ts_pcre]
[62016.403716] [<ffffffff81518277>] skb_find_text+0x67/0xa0
[62016.403720] [<ffffffffa04a712e>] string_mt+0x6e/0xa8 [xt_string]
[62016.403725] [<ffffffffa0037c32>] ipt_do_table+0x262/0x710 [ip_tables]
[62016.403729] [<ffffffffa04820d2>] ? nf_nat_setup_info+0x92/0x350 [nf_nat]
[62016.403734] [<ffffffffa008b036>] iptable_filter_hook+0x36/0x80 [iptable_filter]
[62016.403739] [<ffffffff8155cf50>] nf_iterate+0x70/0xb0
[62016.403742] [<ffffffff8155d038>] nf_hook_slow+0xa8/0x110
[62016.403745] [<ffffffff81566b72>] ip_local_deliver+0xb2/0xd0
[62016.403748] [<ffffffff81566780>] ? ip_rcv_finish+0x350/0x350
[62016.403750] [<ffffffff815664ad>] ip_rcv_finish+0x7d/0x350
[62016.403753] [<ffffffff81566e46>] ip_rcv+0x2b6/0x410
[62016.403755] [<ffffffff81566430>] ? inet_del_offload+0x40/0x40
[62016.403760] [<ffffffff8152aed2>] __netif_receive_skb_core+0x582/0x7d0
[62016.403765] [<ffffffff8101c859>] ? read_tsc+0x9/0x10
[62016.403767] [<ffffffff8152b138>] __netif_receive_skb+0x18/0x60
[62016.403770] [<ffffffff8152b1c0>] netif_receive_skb+0x40/0xc0
[62016.403773] [<ffffffff8152bd30>] napi_gro_receive+0x80/0xb0
[62016.403781] [<ffffffffa010dc24>] igb_clean_rx_irq+0x384/0x7a0 [igb]
[62016.403786] [<ffffffff810c3627>] ? enqueue_entity+0x237/0x8b0
[62016.403793] [<ffffffffa010e3bf>] igb_poll+0x37f/0x770 [igb]
[62016.403797] [<ffffffff810bb7c5>] ? sched_clock_cpu+0x85/0xc0
[62016.403800] [<ffffffff8152b5f2>] net_rx_action+0x152/0x240
[62016.403804] [<ffffffff81084baf>] __do_softirq+0xef/0x280
[62016.403807] [<ffffffff8164845c>] call_softirq+0x1c/0x30
[62016.403811] [<ffffffff81016fc5>] do_softirq+0x65/0xa0
[62016.403813] [<ffffffff81084f45>] irq_exit+0x115/0x120
[62016.403816] [<ffffffff81648ff8>] do_IRQ+0x58/0xf0
[62016.403819] [<ffffffff8163e32d>] common_interrupt+0x6d/0x6d
[62016.403821] <EOI> [<ffffffff811ec590>] ? do_last+0x6d0/0x1270
[62016.403826] [<ffffffff811ec32f>] ? do_last+0x46f/0x1270
[62016.403829] [<ffffffff811eee12>] path_openat+0xc2/0x490
[62016.403832] [<ffffffff8163ac5e>] ? schedule_hrtimeout_range_clock+0xbe/0x150
[62016.403836] [<ffffffff810a9650>] ? hrtimer_get_res+0x50/0x50
[62016.403839] [<ffffffff811f05db>] do_filp_open+0x4b/0xb0
[62016.403842] [<ffffffff811fd177>] ? __alloc_fd+0xa7/0x130
[62016.403845] [<ffffffff811ddf83>] do_sys_open+0xf3/0x1f0
[62016.403848] [<ffffffff811de09e>] SyS_open+0x1e/0x20
[62016.403851] [<ffffffff81646b49>] system_call_fastpath+0x16/0x1b
[62016.403853] ---[ end trace af4b90c5524e6519 ]---