linux-kernel - 5.6.2: BUG: kernel NULL pointer dereference, address: 0000000000000000

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Message-ID: <cc420f6a-5ba6-c598-b09e-5107332315d1@xs4all.nl>
Date:   Mon, 6 Apr 2020 11:46:39 +0200
From:   Udo van den Heuvel <udovdh@...all.nl>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: 5.6.2: BUG: kernel NULL pointer dereference, address:
 0000000000000000

Hello,

Found this in dmesg. What can I do?


[167263.584468] BUG: kernel NULL pointer dereference, address:
0000000000000000
[167263.668969] #PF: supervisor write access in kernel mode
[167263.732609] #PF: error_code(0x0002) - not-present page
[167263.795210] PGD 0 P4D 0
[167263.826574] Oops: 0002 [#1] PREEMPT SMP NOPTI
[167263.879805] CPU: 2 PID: 412735 Comm: firefox Not tainted 5.6.2 #4
[167263.953850] Hardware name: Gigabyte Technology Co., Ltd. X570 AORUS
PRO/X570 AORUS PRO, BIOS F11 12/06/2019
[167264.071668] RIP: 0010:mutex_lock+0xb/0x20
[167264.120722] Code: e8 da 30 98 ff 66 2e 0f 1f 84 00 00 00 00 00 be 02
00 00 00 e9 d6 fa ff ff 66 0f 1f 44 00 00 31 c0 65 48 8b 14 25 00 7c 01
00 <f0> 48 0f b1 17 74 02 eb dc c3 66 66 2e 0f 1f 84 00 00 00 00 00 41
[167264.346852] RSP: 0018:ffffade84043fd88 EFLAGS: 00010246
[167264.410496] RAX: 0000000000000000 RBX: 0000000000000038 RCX:
0000000000000001
[167264.497056] RDX: ffff8f5e8512a0c0 RSI: 0000000000000010 RDI:
0000000000000000
[167264.583613] RBP: ffff8f5c99e55078 R08: 0000000000000000 R09:
0000000000000000
[167264.670174] R10: ffff8f5c99c55010 R11: ffff8f5eb32cdcc0 R12:
0000000000000000
[167264.756738] R13: ffff8f5c99c550d0 R14: ffff8f5e90e22420 R15:
ffff8f5eace7fcc0
[167264.756742] FS:  00007f39a81cb780(0000) GS:ffff8f5edf080000(0000)
knlGS:0000000000000000
[167264.756745] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[167264.756747] CR2: 0000000000000000 CR3: 00000003df78e000 CR4:
00000000003406e0
[167264.756749] Call Trace:
[167264.756759]  eventpoll_release_file+0x3c/0x80
[167264.756766]  __fput+0x1c7/0x230
[167264.756772]  task_work_run+0x8e/0xb0
[167264.756778]  do_exit+0x329/0xa40
[167264.756782]  do_group_exit+0x35/0x90
[167264.756787]  __x64_sys_exit_group+0xf/0x10
[167264.756792]  do_syscall_64+0x63/0x430
[167265.442334]  ? handle_mm_fault+0x4b/0xc0
[167265.442338]  ? do_page_fault+0x1c1/0x41a
[167265.538373]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[167265.538377] RIP: 0033:0x7f39a829e466
[167265.643781] Code: Bad RIP value.
[167265.683469] RSP: 002b:00007ffeb46371c8 EFLAGS: 00000246 ORIG_RAX:
00000000000000e7
[167265.683477] RAX: ffffffffffffffda RBX: 00007f39a8394470 RCX:
00007f39a829e466
[167265.861797] RDX: 0000000000000000 RSI: 000000000000003c RDI:
0000000000000000
[167265.861800] RBP: 0000000000000000 R08: 00000000000000e7 R09:
ffffffffffffff48
[167265.861804] R10: 00007f39a839a84e R11: 0000000000000246 R12:
00007f39a8394470
[167266.121467] R13: 0000000000000770 R14: 00007f39a8397e68 R15:
0000000000000000
[167266.121470] Modules linked in: cp210x usbserial fuse mq_deadline
xt_MASQUERADE iptable_nat nf_nat ipt_REJECT nf_reject_ipv4 xt_u32
xt_multiport iptable_filter nf_conntrack_netbios_ns
nf_conntrack_broadcast ip6t_REJECT nf_reject_ipv6 xt_tcpudp xt_state
xt_conntrack nf_conntrack it87 hwmon_vid nf_defrag_ipv6 nf_defrag_ipv4
ip6table_filter msr ip6_tables uvcvideo videobuf2_vmalloc
videobuf2_memops videobuf2_v4l2 snd_usb_audio videodev
snd_hda_codec_realtek snd_hwdep snd_hda_codec_generic snd_usbmidi_lib
snd_hda_intel videobuf2_common snd_rawmidi snd_intel_dspcfg cdc_acm
snd_hda_codec snd_hda_core snd_seq snd_seq_device snd_pcm snd_timer snd
k10temp i2c_piix4 bfq evdev acpi_cpufreq binfmt_misc ip_tables x_tables
aesni_intel amdgpu gpu_sched ttm sr_mod cdrom hid_generic usbhid i2c_dev
autofs4
[167267.045596] CR2: 0000000000000000
[167267.086324] ---[ end trace 61fa72f5201dad20 ]---
[167267.142678] RIP: 0010:mutex_lock+0xb/0x20
[167267.191737] Code: e8 da 30 98 ff 66 2e 0f 1f 84 00 00 00 00 00 be 02
00 00 00 e9 d6 fa ff ff 66 0f 1f 44 00 00 31 c0 65 48 8b 14 25 00 7c 01
00 <f0> 48 0f b1 17 74 02 eb dc c3 66 66 2e 0f 1f 84 00 00 00 00 00 41
[167267.417871] RSP: 0018:ffffade84043fd88 EFLAGS: 00010246
[167267.481510] RAX: 0000000000000000 RBX: 0000000000000038 RCX:
0000000000000001
[167267.568071] RDX: ffff8f5e8512a0c0 RSI: 0000000000000010 RDI:
0000000000000000
[167267.654626] RBP: ffff8f5c99e55078 R08: 0000000000000000 R09:
0000000000000000
[167267.741187] R10: ffff8f5c99c55010 R11: ffff8f5eb32cdcc0 R12:
0000000000000000
[167267.827743] R13: ffff8f5c99c550d0 R14: ffff8f5e90e22420 R15:
ffff8f5eace7fcc0
[167267.914304] FS:  00007f39a81cb780(0000) GS:ffff8f5edf080000(0000)
knlGS:0000000000000000
[167268.012322] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[167268.082218] CR2: 00007f39a829e43c CR3: 00000003df78e000 CR4:
00000000003406e0
[167268.168775] Fixing recursive fault but reboot is needed!



Udo