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SubjectRe: 5.3.18: BUG: kernel NULL pointer dereference
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Date
Hello,

Another thingie in dmesg; how does this one relate to
https://bugzilla.kernel.org/show_bug.cgi?id=206191 ?

[68167.282624] BUG: kernel NULL pointer dereference, address:
0000000000000028
[68167.324320] #PF: supervisor read access in kernel mode
[68167.355103] #PF: error_code(0x0000) - not-present page
[68167.385880] PGD 0 P4D 0
[68167.401034] Oops: 0000 [#2] PREEMPT SMP NOPTI
[68167.427127] CPU: 4 PID: 4510 Comm: transmission-gt Tainted: G D
W 5.3.18 #25
[68167.476136] Hardware name: Gigabyte Technology Co., Ltd. X570 AORUS
PRO/X570 AORUS PRO, BIOS F11 12/06/2019
[68167.534521] RIP: 0010:find_get_entry+0x80/0x130
[68167.561655] Code: 00 e8 f4 56 57 00 48 89 c2 48 3d 06 04 00 00 74 e4
48 3d 02 04 00 00 74 dc 48 85 c0 0f 84 a2 00 00 00 a8 01 0f 85 9f 00 00
00 <48> 8b 40 08 48 8d 78 ff a8 01 48 0f 44 fa 8b 47 34 85 c0 74 b6 8d
[68167.674199] RSP: 0018:ffffa85243f2fce8 EFLAGS: 00010246
[68167.705499] RAX: 0000000000000020 RBX: 0000000000000000 RCX:
ffffa2e9d1d6a240
[68167.748260] RDX: 0000000000000020 RSI: 0000000000000000 RDI:
ffffa85243f2fce8
[68167.791018] RBP: ffffa2ea60cf14c8 R08: 0000000000004000 R09:
0000000000000000
[68167.833776] R10: 0000000000000000 R11: 0000000000000000 R12:
ffffa2ea60cf14c8
[68167.876534] R13: 0000000000198a29 R14: 0000000000000000 R15:
0000000000198a29
[68167.919295] FS: 00007f967ed06700(0000) GS:ffffa2ea9f100000(0000)
knlGS:0000000000000000
[68167.967782] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[68168.002207] CR2: 0000000000000028 CR3: 000000040f44e000 CR4:
00000000003406e0
[68168.044965] Call Trace:
[68168.059604] pagecache_get_page+0x22/0x220
[68168.084133] generic_file_read_iter+0x175/0x7d0
[68168.111270] ? __do_page_cache_readahead+0x18e/0x1b0
[68168.141008] new_sync_read+0x106/0x1a0
[68168.163449] vfs_read+0x98/0x120
[68168.182771] ksys_pread64+0x60/0xa0
[68168.203657] do_syscall_64+0x5f/0x2d0
[68168.225581] ? schedule+0x48/0xc0
[68168.245425] ? switch_fpu_return+0x24/0xc0
[68168.269954] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[68168.300214] RIP: 0033:0x7f968eb721af
[68168.321620] Code: 08 89 3c 24 48 89 4c 24 18 e8 4d f3 ff ff 4c 8b 54
24 18 48 8b 54 24 10 41 89 c0 48 8b 74 24 08 8b 3c 24 b8 11 00 00 00 0f
05 <48> 3d 00 f0 ff ff 77 2d 44 89 c7 48 89 04 24 e8 7d f3 ff ff 48 8b
[68168.434168] RSP: 002b:00007f967ed05870 EFLAGS: 00000293 ORIG_RAX:
0000000000000011
[68168.479532] RAX: ffffffffffffffda RBX: 0000000000000000 RCX:
00007f968eb721af
[68168.522288] RDX: 0000000000004000 RSI: 00007f9668d2114d RDI:
0000000000000066
[68168.565047] RBP: 00007f967ed05920 R08: 0000000000000000 R09:
00007f967ed05920
[68168.607806] R10: 0000000198a27fde R11: 0000000000000293 R12:
0000000000004000
[68168.650561] R13: 0000000000000001 R14: 00007f9668021ac8 R15:
00007f966802a8f0
[68168.693323] Modules linked in: fuse mq_deadline ip6t_REJECT
nf_reject_ipv6 xt_state ip6table_filter ip6_tables
nf_conntrack_netbios_ns nf_conntrack_broadcast xt_MASQUERADE iptable_nat
nf_nat ipt_REJECT nf_reject_ipv4 xt_u32 xt_multiport xt_tcpudp
xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 it87 hwmon_vid
msr iptable_filter uvcvideo videobuf2_vmalloc videobuf2_memops
snd_usb_audio videobuf2_v4l2 snd_hwdep snd_usbmidi_lib videodev
snd_hda_codec_realtek videobuf2_common snd_rawmidi cdc_acm
snd_hda_codec_generic snd_hda_intel snd_hda_codec snd_hda_core snd_seq
snd_seq_device snd_pcm i2c_piix4 k10temp snd_timer snd bfq evdev
acpi_cpufreq binfmt_misc ip_tables x_tables amdgpu hid_generic backlight
sr_mod gpu_sched aesni_intel ttm cdrom usbhid i2c_dev autofs4
[68169.136045] CR2: 0000000000000028
[68169.165281] ---[ end trace 76feac8f53a00049 ]---
[68169.192938] RIP: 0010:queued_spin_lock_slowpath+0x178/0x1d0
[68169.226320] Code: 8b 45 00 48 85 c0 74 f5 48 89 c2 eb e4 c1 ea 12 83
e0 03 ff ca 48 c1 e0 04 48 63 d2 48 05 c0 ed 01 00 48 03 04 d5 20 d5 e0
b1 <48> 89 28 8b 45 08 85 c0 75 09 f3 90 8b 45 08 85 c0 74 f7 48 8b 45
[68169.338870] RSP: 0018:ffffa85240747a88 EFLAGS: 00010002
[68169.370168] RAX: 0001812dff56fe58 RBX: ffffa2e9c6690350 RCX:
0000000000000000
[68169.412923] RDX: 0000000000003199 RSI: 00000000c6690300 RDI:
ffffa2e9c6690350
[68169.455683] RBP: ffffa2ea9f05edc0 R08: 0000000000000238 R09:
0000000000000002
[68169.498444] R10: ffffa2e9c6690348 R11: ffffa2ea8b08ed80 R12:
0000000000080000
[68169.541203] R13: 0000000000000001 R14: ffffa2e9c6690350 R15:
ffffddcf0c8ad008
[68169.583959] FS: 00007f967ed06700(0000) GS:ffffa2ea9f100000(0000)
knlGS:0000000000000000
[68169.632445] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[68169.666872] CR2: 0000000000000028 CR3: 000000040f44e000 CR4:
00000000003406e0


On 25-03-2020 06:07, Udo van den Heuvel wrote:
> Hello,
>
> Due to the unusable 5.4.x and 5.5.x kernels, see
> https://bugzilla.kernel.org/show_bug.cgi?id=206191, I am running 5,3,18.
> This kernel crashes way less.
> It did show the fault below:
>
> [56279.400332] general protection fault: 0000 [#1] PREEMPT SMP NOPTI
> [56279.436856] CPU: 1 PID: 233 Comm: kswapd0 Tainted: G W
> 5.3.18 #25
> [56279.481174] Hardware name: Gigabyte Technology Co., Ltd. X570 AORUS
> PRO/X570 AORUS PRO, BIOS F11 12/06/2019
> [56279.539562] RIP: 0010:queued_spin_lock_slowpath+0x178/0x1d0
> [56279.572948] Code: 8b 45 00 48 85 c0 74 f5 48 89 c2 eb e4 c1 ea 12 83
> e0 03 ff ca 48 c1 e0 04 48 63 d2 48 05 c0 ed 01 00 48 03 04 d5 20 d5 e0
> b1 <48> 89 28 8b 45 08 85 c0 75 09 f3 90 8b 45 08 85 c0 74 f7 48 8b 45
> [56279.685489] RSP: 0018:ffffa85240747a88 EFLAGS: 00010002
> [56279.716787] RAX: 0001812dff56fe58 RBX: ffffa2e9c6690350 RCX:
> 0000000000000000
> [56279.759547] RDX: 0000000000003199 RSI: 00000000c6690300 RDI:
> ffffa2e9c6690350
> [56279.802302] RBP: ffffa2ea9f05edc0 R08: 0000000000000238 R09:
> 0000000000000002
> [56279.845063] R10: ffffa2e9c6690348 R11: ffffa2ea8b08ed80 R12:
> 0000000000080000
> [56279.887823] R13: 0000000000000001 R14: ffffa2e9c6690350 R15:
> ffffddcf0c8ad008
> [56279.930579] FS: 0000000000000000(0000) GS:ffffa2ea9f040000(0000)
> knlGS:0000000000000000
> [56279.979068] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [56280.013491] CR2: 00007f07ef659fe0 CR3: 00000003eaa7e000 CR4:
> 00000000003406e0
> [56280.056253] Call Trace:
> [56280.070891] _raw_spin_lock_irqsave+0x33/0x40
> [56280.096982] __remove_mapping+0x4a/0x1e0
> [56280.120469] shrink_page_list+0xb12/0xe60
> [56280.144477] shrink_inactive_list+0x1ad/0x350
> [56280.170573] shrink_node_memcg.isra.0+0x46e/0x7b0
> [56280.198747] shrink_node+0x80/0x2e0
> [56280.219631] balance_pgdat+0x239/0x4a0
> [56280.242078] kswapd+0x165/0x2f0
> [56280.260880] ? wait_woken+0x70/0x70
> [56280.281761] kthread+0xfb/0x130
> [56280.300562] ? balance_pgdat+0x4a0/0x4a0
> [56280.324052] ? kthread_park+0x70/0x70
> [56280.345980] ret_from_fork+0x22/0x40
> [56280.367383] Modules linked in: fuse mq_deadline ip6t_REJECT
> nf_reject_ipv6 xt_state ip6table_filter ip6_tables
> nf_conntrack_netbios_ns nf_conntrack_broadcast xt_MASQUERADE iptable_nat
> nf_nat ipt_REJECT nf_reject_ipv4 xt_u32 xt_multiport xt_tcpudp
> xt_conntrack nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 it87 hwmon_vid
> msr iptable_filter uvcvideo videobuf2_vmalloc videobuf2_memops
> snd_usb_audio videobuf2_v4l2 snd_hwdep snd_usbmidi_lib videodev
> snd_hda_codec_realtek videobuf2_common snd_rawmidi cdc_acm
> snd_hda_codec_generic snd_hda_intel snd_hda_codec snd_hda_core snd_seq
> snd_seq_device snd_pcm i2c_piix4 k10temp snd_timer snd bfq evdev
> acpi_cpufreq binfmt_misc ip_tables x_tables amdgpu hid_generic backlight
> sr_mod gpu_sched aesni_intel ttm cdrom usbhid i2c_dev autofs4
> [56280.442646] [drm] Fence fallback timer expired on ring gfx
> [56280.773148] ---[ end trace 76feac8f53a00048 ]---
> [56280.773152] RIP: 0010:queued_spin_lock_slowpath+0x178/0x1d0
> [56280.773154] Code: 8b 45 00 48 85 c0 74 f5 48 89 c2 eb e4 c1 ea 12 83
> e0 03 ff ca 48 c1 e0 04 48 63 d2 48 05 c0 ed 01 00 48 03 04 d5 20 d5 e0
> b1 <48> 89 28 8b 45 08 85 c0 75 09 f3 90 8b 45 08 85 c0 74 f7 48 8b 45
> [56280.773155] RSP: 0018:ffffa85240747a88 EFLAGS: 00010002
> [56280.773156] RAX: 0001812dff56fe58 RBX: ffffa2e9c6690350 RCX:
> 0000000000000000
> [56280.773157] RDX: 0000000000003199 RSI: 00000000c6690300 RDI:
> ffffa2e9c6690350
> [56280.773157] RBP: ffffa2ea9f05edc0 R08: 0000000000000238 R09:
> 0000000000000002
> [56280.773158] R10: ffffa2e9c6690348 R11: ffffa2ea8b08ed80 R12:
> 0000000000080000
> [56280.773159] R13: 0000000000000001 R14: ffffa2e9c6690350 R15:
> ffffddcf0c8ad008
> [56280.773160] FS: 0000000000000000(0000) GS:ffffa2ea9f040000(0000)
> knlGS:0000000000000000
> [56280.773160] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
> [56280.773161] CR2: 00007f07ef659fe0 CR3: 00000003eaa7e000 CR4:
> 00000000003406e0
> [56280.773163] note: kswapd0[233] exited with preempt_count 1
>
>
>
> What happened here?
> Please let me know.
>
> Kind regards,
> Udo
>

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