Sorry if this is not the right place to report this. I've been using kernel 5.12.13-gentoo-dist for couple weeks now with no issues. However, yesterday, after some ~11 days of uptime (with a few suspends in between), I got the following crash: kernel: BUG: kernel NULL pointer dereference, address: 0000000000000000 kernel: #PF: supervisor read access in kernel mode kernel: #PF: error_code(0x0000) - not-present page kernel: PGD 0 P4D 0 kernel: Oops: 0000 [#1] SMP NOPTI kernel: CPU: 2 PID: 18869 Comm: kworker/u16:80 Tainted: G W 5.12.13-gentoo-dist #1 kernel: Hardware name: LENOVO 20S0000HPG/20S0000HPG, BIOS N2XET29W (1.19 ) 03/23/2021 kernel: Workqueue: netns cleanup_net kernel: RIP: 0010:rb_erase+0x106/0x350 kernel: Code: 00 00 48 89 10 48 8b 02 a8 01 0f 84 35 02 00 00 48 83 e0 fc 75 01 c3 48 89 d1 48 89 c2 48 8b 42 08 48 39 c8 75 af 48 8b 42 10 <f6> 00 01 0f 84 1d 01 00 00 48 8b 70 10 48 85 f6 74 05 f6 06 01 74 kernel: RSP: 0018:ffffb42a45f2fd90 EFLAGS: 00010246 kernel: RAX: 0000000000000000 RBX: ffff954919ed4300 RCX: 0000000000000000 kernel: RDX: ffff954b90417b10 RSI: ffff954a75550150 RDI: ffff954b90417ad0 kernel: RBP: ffffffff8cf1e580 R08: ffff954919ed4350 R09: 0000000000000000 kernel: R10: ffff954b90417af0 R11: 0000000000000000 R12: ffff954b90417a80 kernel: R13: ffff954919ed5c40 R14: ffff9549283a9420 R15: ffff9549283a93d4 kernel: FS: 0000000000000000(0000) GS:ffff954c4f680000(0000) knlGS:0000000000000000 kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 kernel: CR2: 0000000000000000 CR3: 0000000419410006 CR4: 00000000003706e0 kernel: Call Trace: kernel: drop_sysctl_table+0xae/0x150 kernel: unregister_sysctl_table.part.0+0x3b/0x90 kernel: ipv6_frags_exit_net+0x1a/0x40 kernel: ops_exit_list+0x33/0x60 kernel: cleanup_net+0x1e0/0x310 kernel: process_one_work+0x21d/0x3b0 kernel: worker_thread+0x50/0x400 kernel: ? process_one_work+0x3b0/0x3b0 kernel: kthread+0x11b/0x140 kernel: ? __kthread_bind_mask+0x60/0x60 kernel: ret_from_fork+0x1f/0x30 kernel: Modules linked in: uas usb_storage tcp_diag inet_diag cdc_acm squashfs loop ccm ppp_deflate bsd_comp ppp_async ppp_generic slhc vhost_net vhost vhost_iotlb tap tun veth fuse uinput rfcomm zram nf_conntrack_netlink nfnetlink br_netfilter bridge stp llc overlay snd_soc_skl_hda_dsp snd_soc_hdac_hdmi cmac bnep snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_codec_generic nf_log_ipv6 ip6t_REJECT nf_reject_ipv6 xt_hl ip6t_rt nf_log_ipv4 nf_log_common xt_LOG xt_recent xt_limit nf_conntrack_netbios_ns nf_conntrack_broadcast nf_nat_ftp nf_conntrack_f
Looks like a bug in kernel, also seen on Fedora (https://abrt.fedoraproject.org/faf/reports/165213/). Are you able to reproduce/trigger the bug?
Hi Thomas, thanks for looking into this. Unfortunately I don't know what triggered the crash and it hasn't happened again yet.
(In reply to Nuno from comment #2) > Hi Thomas, thanks for looking into this. > > Unfortunately I don't know what triggered the crash and it hasn't happened > again yet. Thanks for the reply. Please re-open this if this reappears