Boot issue on x86_64: kernel 5.15.2 - RIP: 0010:__unwind_start+0x10b/0x1e0

[Bruno Goncalves]

Hello,

We've started to see the issue below when booting on x86_64 on recent
kernel builds from linux-stable-rc. More logs can be found on [1] and
cki tracker issue [2].

[   24.006329] zram: Added device: zram0
[   25.075694] systemd[1]:
/usr/lib/systemd/system/restraintd.service:8: Standard output type
syslog+console is obsolete, automatically updating to journal+console.
Please update your unit file, and consider removing the setting
altogether.
[   25.342129] BUG: unable to handle page fault for address: ffffb57143fb7de0
[   25.376757] #PF: supervisor read access in kernel mode
[   25.402135] #PF: error_code(0x0000) - not-present page
[   25.426507] PGD 100000067 P4D 100000067 PUD 1001e2067 PMD 31b1c3067 PTE 0
[   25.461485] Oops: 0000 [#1] SMP PTI
[   25.477997] CPU: 4 PID: 1 Comm: systemd Tainted: G          I       5.15.2 #1
[   25.512982] Hardware name: HP ProLiant SL390s G7/, BIOS P69 07/02/2013
[   25.548041] RIP: 0010:__unwind_start+0x10b/0x1e0
[   25.570958] Code: af fb ff 85 c0 75 d2 eb c0 65 48 8b 04 25 c0 bb
01 00 48 39 c6 0f 84 86 00 00 00 48 8b 86 98 23 00 00 48 8d 78 38 48
89 7d 38 <48> 8b 50 28 48 89 55 40 48 8b 40 30 48 89 45 48 48 3d 80 43
00 81
[   25.668824] RSP: 0018:ffffb5714313bc18 EFLAGS: 00010083
[   25.695397] RAX: ffffb57143fb7db8 RBX: ffffb57143fb7db8 RCX: 0000000000000000
[   25.733090] RDX: 0000000000000000 RSI: ffff924d03534d00 RDI: ffffb57143fb7df0
[   25.769626] RBP: ffffb5714313bc38 R08: 0000000000000040 R09: 0000000000001000
[   25.808015] R10: 8000000000000000 R11: 0000000000000000 R12: 0000000000000000
[   25.841524] R13: ffff924d03535974 R14: 0000000000000155 R15: 0000000000000001
[   25.878031] FS:  00007f49ec409340(0000) GS:ffff924f0ba80000(0000)
knlGS:0000000000000000
[   25.916770] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   25.946918] CR2: ffffb57143fb7de0 CR3: 00000001039ae005 CR4: 00000000000206e0
[   25.988907] Call Trace:
[   26.001096]  <TASK>
[   26.013087]  __get_wchan+0x35/0x80
[   26.031979]  get_wchan+0x65/0x80
[   26.047218]  do_task_stat+0xcd9/0xde0
[   26.064584]  proc_single_show+0x4d/0xb0
[   26.083925]  seq_read_iter+0x120/0x4b0
[   26.103266]  seq_read+0xed/0x120
[   26.118507]  ? security_inode_notifysecctx+0x30/0x50
[   26.142094]  vfs_read+0x95/0x190
[   26.158829]  ksys_read+0x4f/0xc0
[   26.175927]  do_syscall_64+0x3b/0x90
[   26.194142]  entry_SYSCALL_64_after_hwframe+0x44/0xae
[   26.220169] RIP: 0033:0x7f49ecf992e2
[   26.239468] Code: c0 e9 b2 fe ff ff 50 48 8d 3d ea 2e 0a 00 e8 95
e9 01 00 0f 1f 44 00 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75
10 0f 05 <48> 3d 00 f0 ff ff 77 56 c3 0f 1f 44 00 00 48 83 ec 28 48 89
54 24
[   26.336968] RSP: 002b:00007ffc3fedf998 EFLAGS: 00000246 ORIG_RAX:
0000000000000000
[   26.376294] RAX: ffffffffffffffda RBX: 000055fd5a6a1f30 RCX: 00007f49ecf992e2
[   26.410402] RDX: 0000000000000400 RSI: 000055fd5a7f2e90 RDI: 0000000000000010
[   26.447213] RBP: 00007f49ed06d300 R08: 0000000000000010 R09: 0000000000000001
[   26.481089] R10: 0000000000001000 R11: 0000000000000246 R12: 00007f49ec4090f8
[   26.517502] R13: 0000000000000d68 R14: 00007f49ed06c700 R15: 0000000000000d68
[   26.551484]  </TASK>
[   26.561812] Modules linked in: zram ip_tables xfs radeon
i2c_algo_bit drm_ttm_helper ttm drm_kms_helper crct10dif_pclmul
crc32_pclmul crc32c_intel cec ata_generic ghash_clmulni_intel
serio_raw drm pata_acpi hpwdt
[   26.657383] CR2: ffffb57143fb7de0
[   26.673063] ---[ end trace d486977d124663a0 ]---


[1] https://datawarehouse.cki-project.org/kcidb/tests/1872788
[2] https://datawarehouse.cki-project.org/issue/747

Thanks,
Bruno