Hi,
today I took the usual look in LOG SUMMARY and was surprised finding this:
***SNIP*** Kernel
WARNING: Kernel Errors Present WARNING: CPU: 0 PID: 2984 at lib/refcount.c:28 r ...: 1 Time(s)
1 Time(s): ? nfnetlink_net_exit_batch+0x60/0x60 1 Time(s): [last unloaded: hwmon_vid] 1 Time(s): ____sys_sendmsg+0x258/0x2a0 1 Time(s): ___sys_sendmsg+0xa3/0xf0 1 Time(s): __sys_sendmsg+0x81/0xd0 1 Time(s): do_syscall_64+0x33/0x40 1 Time(s): entry_SYSCALL_64_after_hwframe+0x44/0xa9 1 Time(s): netlink_rcv_skb+0x5b/0x100 1 Time(s): netlink_sendmsg+0x23a/0x470 1 Time(s): netlink_unicast+0x209/0x2d0 1 Time(s): nf_queue_entry_release_refs+0x82/0xa0 1 Time(s): nf_reinject+0x7a/0x1e0 1 Time(s): nfnetlink_rcv_msg+0x16d/0x2c0 1 Time(s): nfqnl_recv_verdict+0x302/0x4f0 [nfnetlink_queue] 1 Time(s): sock_sendmsg+0x5e/0x60 1 Time(s): ------------[ cut here ]------------ 1 Time(s): ---[ end trace 49e1e291edb98731 ]--- 1 Time(s): CPU: 0 PID: 2984 Comm: W-NFQ#1 Tainted: G O 5.10.55-ipfire #1 1 Time(s): CR2: 000079fa1356a6f8 CR3: 0000000101532004 CR4: 00000000000706f0 1 Time(s): CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 1 Time(s): Call Trace: 1 Time(s): Code: 05 ba 60 1f 01 01 e8 af a3 52 00 0f 0b c3 80 3d a8 60 1f 01 00 75 95 48 c7 c7 b8 fc 11 b4 c6 05 98 60 1f 01 01 e8 90 a3 52 00 <0f> 0b c3 80 3d 87 60 1f 01 00 0f 85 72 ff ff ff 48 c7 c7 10 fd 11 1 Time(s): Code: 28 89 54 24 1c 48 89 74 24 10 89 7c 24 08 e8 fa ee ff ff 8b 54 24 1c 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 33 44 89 c7 48 89 44 24 08 e8 4e ef ff ff 48 1 Time(s): FS: 00007144d27d9640(0000) GS:ffff9db887200000(0000) knlGS:0000000000000000 1 Time(s): Hardware name: To be filled by O.E.M. To be filled by O.E.M./CRESCENTBAY, BIOS 5.011 04/13/2016 1 Time(s): Modules linked in: xt_REDIRECT nfnetlink_queue xt_NFQUEUE xt_MASQUERADE ccm cpufreq_conservative cpufreq_ondemand xt_geoip(O) xt_ipp2p(O) compat_xtables(O) xt_hashlimit xt_mac xt_multiport xt_mark xt_policy xt_TCPMSS xt_conntrack xt_comment ipt_REJECT nf_reject_ipv4 xt_LOG xt_limit nf_log_ipv4 nf_log_common iptable_raw iptable_mangle iptable_filter vfat fat sch_fq_codel rt2800usb rt2x00usb x86_pkg_temp_thermal rt2800lib intel_powerclamp coretemp rt2x00lib kvm_intel mac80211 kvm at24 regmap_i2c iTCO_wdt iTCO_vendor_support irqbypass crct10dif_pclmul cfg80211 crc32_pclmul ghash_clmulni_intel pcspkr i2c_i801 rfkill r8169 lpc_ich i2c_smbus mfd_core realtek libarc4 ir_rc6_decoder rc_rc6_mce i2c_algo_bit snd_hda_codec_realtek nuvoton_cir fb_sys_fops syscopyarea sysfillrect sysimgblt snd_hda_codec_generic ledtrig_audio i2c_core rc_core snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_hda_core snd_hwdep acpi_pad snd_pcm snd_timer snd soundcore lp parport_pc parport video 1 Time(s): R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000000000 1 Time(s): R10: ffffb330821af780 R11: ffffffffb4533dc8 R12: ffff9db791371980 1 Time(s): R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000070 1 Time(s): R13: ffff9db7444d9200 R14: 0000000000000005 R15: ffff9db7f15c6b00 1 Time(s): RAX: 0000000000000000 RBX: ffff9db791371980 RCX: 0000000000000027 1 Time(s): RAX: ffffffffffffffda RBX: 00007144c4268dd0 RCX: 00007144d507062d 1 Time(s): RBP: 00007144d27d6fe0 R08: 0000000000000000 R09: 00007144d4754de0 1 Time(s): RBP: ffffb330821afa50 R08: 0000000000000000 R09: ffffb330821af788 1 Time(s): RDX: 0000000000000000 RSI: 00007144d27d6f80 RDI: 0000000000000006 1 Time(s): RDX: ffff9db887218968 RSI: 0000000000000001 RDI: ffff9db887218960 1 Time(s): RIP: 0010:refcount_warn_saturate+0xa6/0xf0 1 Time(s): RIP: 0033:0x7144d507062d 1 Time(s): RSP: 0018:ffffb330821af950 EFLAGS: 00010282 1 Time(s): RSP: 002b:00007144d27d6f40 EFLAGS: 00000293 ORIG_RAX: 000000000000002e 1 Time(s): refcount_t: underflow; use-after-free. ***SNAP***
I don't know exactly how do deal with this - does anyone has an idea what this means?
Besides the machine is up and running with Core 159 / 64bit since 6 days now and if I hadn't looked at the logs I would not have noticed it.
I didn't reboot or changed anything yet- should I do?
Best, Matthias