Public bug reported:
I observed the following kernel panic with the 5.4.0-71.79-generic
kernel while running kernel selftests:
blanka login: [ 1671.958400] mmiotrace: Error taking CPU253 down: -28
[ 1672.118199] mmiotrace: Error taking CPU254 down: -28
[ 1672.230306] mmiotrace: Error taking CPU255 down: -28
[ 2503.359753] BUG: kernel NULL pointer dereference, address: 0000000000000050
[ 2503.367527] #PF: supervisor read access in kernel mode
[ 2503.373257] #PF: error_code(0x0000) - not-present page
[ 2503.378989] PGD 0 P4D 0
[ 2503.381812] Oops: 0000 [#1] SMP NOPTI
[ 2503.385896] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G OE
5.4.0-71-generic #79-Ubuntu
[ 2503.395795] Hardware name: NVIDIA DGXA100 920-23687-2530-000/DGXA100, BIOS
0.33 01/19/2021
[ 2503.405027] RIP: 0010:trace_event_raw_event_wbt_timer+0x6f/0x100
[ 2503.411728] Code: 59 80 e5 02 0f 85 8f 00 00 00 4c 89 e6 ba 34 00 00 00 48
8d 7d a0 e8 d0 a4 ca ff 49 89 c4 48 85 c0 74 37 49 8b 87 b8 03 00 00 <48> 8b 70
50 48 85 f6 74 45 49 8d 7c 24 08 ba 20 00 00 00 e8 59 91
[ 2503.432683] RSP: 0018:ffffa8d6c0003d90 EFLAGS: 00010286
[ 2503.438513] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000080000100
[ 2503.446474] RDX: ffff9968a228f418 RSI: 0000000000000100 RDI: ffff9968a228f414
[ 2503.454436] RBP: ffffa8d6c0003df8 R08: ffff9968a228f414 R09: 0000000000000100
[ 2503.462394] R10: 0000000000000007 R11: 0000000000000007 R12: ffff9968a228f418
[ 2503.470353] R13: 00000000fffffffa R14: 0000000000000003 R15: ffff9a686f9b3000
[ 2503.478316] FS: 0000000000000000(0000) GS:ffff99690cc00000(0000)
knlGS:0000000000000000
[ 2503.487342] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2503.493752] CR2: 0000000000000050 CR3: 0000007e08ad6000 CR4: 0000000000340ef0
[ 2503.501712] Call Trace:
[ 2503.504438] <IRQ>
[ 2503.506682] wb_timer_fn+0x1d6/0x3c0
[ 2503.510672] ? blk_stat_free_callback_rcu+0x30/0x30
[ 2503.516112] blk_stat_timer_fn+0x134/0x140
[ 2503.520683] call_timer_fn+0x32/0x130
[ 2503.524768] __run_timers.part.0+0x180/0x280
[ 2503.529535] ? trace_event_raw_event_softirq+0x5d/0xa0
[ 2503.535267] run_timer_softirq+0x2a/0x50
[ 2503.539644] __do_softirq+0xe1/0x2d6
[ 2503.543629] irq_exit+0xae/0xb0
[ 2503.547132] smp_apic_timer_interrupt+0x7b/0x140
[ 2503.552280] apic_timer_interrupt+0xf/0x20
[ 2503.556848] </IRQ>
[ 2503.559187] RIP: 0010:native_safe_halt+0xe/0x10
[ 2503.564239] Code: 7b ff ff ff eb bd 90 90 90 90 90 90 e9 07 00 00 00 0f 00
2d 66 dd 52 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 56 dd 52 00 fb f4 <c3> 90 0f
1f 44 00 00 55 48 89 e5 41 55 41 54 53 e8 cd cd 63 ff 65
[ 2503.585191] RSP: 0018:ffffffff94803e18 EFLAGS: 00000202 ORIG_RAX:
ffffffffffffff13
[ 2503.593635] RAX: 000000000001e7c0 RBX: ffff996849080de8 RCX: 0000000000149022
[ 2503.601595] RDX: 0000000000149022 RSI: 0000000000000000 RDI: ffffffff948c5ba0
[ 2503.609556] RBP: ffffffff94803e38 R08: 00000000000002a8 R09: ffff9968a228f000
[ 2503.617516] R10: 0000000000000000 R11: 0000000000000002 R12: 0000000000000000
[ 2503.625475] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[ 2503.633440] ? default_idle+0x20/0x140
[ 2503.637623] arch_cpu_idle+0x15/0x20
[ 2503.641608] default_idle_call+0x23/0x30
[ 2503.645984] do_idle+0x1fb/0x270
[ 2503.649583] cpu_startup_entry+0x20/0x30
[ 2503.653960] rest_init+0xae/0xb0
[ 2503.657563] arch_call_rest_init+0xe/0x1b
[ 2503.662025] start_kernel+0x549/0x56a
[ 2503.666108] x86_64_start_reservations+0x24/0x26
[ 2503.671258] x86_64_start_kernel+0x75/0x79
[ 2503.675828] secondary_startup_64+0xa4/0xb0
[ 2503.680493] Modules linked in: sch_etf sch_fq dccp_ipv6 dccp_ipv4 dccp
ip6table_nat iptable_nat xt_nat nf_nat algif_hash af_alg ip6table_filter
xt_conntrack nf_conntrack nf_defrag_ipv4 ip6_tables nf_defrag_ipv6 ip_vti
ip6_vti fou6 sit ipip tunnel4 geneve act_mirred cls_basic esp6 authenc echainiv
iptable_filter xt_policy bpfilter veth esp4_offload esp4 xfrm_user xfrm_algo
macsec fou vxlan ip6_udp_tunnel udp_tunnel vrf 8021q garp mrp bridge stp llc
ip6_gre ip6_tunnel tunnel6 ip_gre ip_tunnel gre cls_u32 sch_htb dummy
binfmt_misc nls_iso8859_1 dm_multipath scsi_dh_rdac scsi_dh_emc scsi_dh_alua
amd64_edac_mod edac_mce_amd kvm_amd kvm ipmi_ssif input_leds cdc_ether usbnet
mii ccp k10temp ipmi_si ipmi_devintf ipmi_msghandler mac_hid sch_fq_codel
knem(OE) ip_tables x_tables autofs4 btrfs zstd_compress raid10 raid456
async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq
libcrc32c raid1 multipath linear ses enclosure ast crct10dif_pclmul
drm_vram_helper crc32_pclmul ttm
[ 2503.680569] ghash_clmulni_intel aesni_intel mlx5_core(OE) crypto_simd
pci_hyperv_intf drm_kms_helper tls syscopyarea cryptd raid0 glue_helper
mlxfw(OE) hid_generic sysfillrect igb sysimgblt mpt3sas uas dca mdev(OE)
fb_sys_fops raid_class i2c_algo_bit usbhid nvme scsi_transport_sas hid
usb_storage drm mlx_compat(OE) nvme_core i2c_piix4 [last unloaded: trace_printk]
[ 2503.813546] CR2: 0000000000000050
[ 2503.817337] ---[ end trace ccd7c184afc3c422 ]---
[ 2503.933758] RIP: 0010:trace_event_raw_event_wbt_timer+0x6f/0x100
[ 2503.940458] Code: 59 80 e5 02 0f 85 8f 00 00 00 4c 89 e6 ba 34 00 00 00 48
8d 7d a0 e8 d0 a4 ca ff 49 89 c4 48 85 c0 74 37 49 8b 87 b8 03 00 00 <48> 8b 70
50 48 85 f6 74 45 49 8d 7c 24 08 ba 20 00 00 00 e8 59 91
[ 2503.961410] RSP: 0018:ffffa8d6c0003d90 EFLAGS: 00010286
[ 2503.967239] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000080000100
[ 2503.975200] RDX: ffff9968a228f418 RSI: 0000000000000100 RDI: ffff9968a228f414
[ 2503.983161] RBP: ffffa8d6c0003df8 R08: ffff9968a228f414 R09: 0000000000000100
[ 2503.991122] R10: 0000000000000007 R11: 0000000000000007 R12: ffff9968a228f418
[ 2503.999083] R13: 00000000fffffffa R14: 0000000000000003 R15: ffff9a686f9b3000
[ 2504.007044] FS: 0000000000000000(0000) GS:ffff99690cc00000(0000)
knlGS:0000000000000000
[ 2504.016070] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 2504.022479] CR2: 0000000000000050 CR3: 0000007e08ad6000 CR4: 0000000000340ef0
[ 2504.030442] Kernel panic - not syncing: Fatal exception in interrupt
[ 2504.038450] Kernel Offset: 0x12200000 from 0xffffffff81000000 (relocation
range: 0xffffffff80000000-0xffffffffbfffffff)
[ 2504.161847] ---[ end Kernel panic - not syncing: Fatal exception in
interrupt ]---
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Focal)
Importance: Undecided
Status: Confirmed
** Affects: linux (Ubuntu Groovy)
Importance: Undecided
Status: New
** Affects: linux (Ubuntu Hirsute)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Groovy)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Hirsute)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Focal)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Focal)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/1922387
Title:
BUG: kernel NULL pointer dereference, address: 0000000000000050
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