[Bug 218980] [VM boot] Guest Kernel hit BUG: kernel NULL pointer dereference, address: 0000000000000010 and WARNING: CPU: 0 PID: 218 at arch/x86/kernel/fpu/core.c:57 x86_task_fpu+0x17/0x20

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=218980

--- Comment #5 from Luis Chamberlain (mcgrof@kernel.org) ---
On Mon, Jun 24, 2024 at 06:43:54AM +0000, bugzilla-daemon@kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=218980
> 
>             Bug ID: 218980
>            Summary: [VM boot] Guest Kernel hit BUG: kernel NULL pointer
>                     dereference, address: 0000000000000010 and WARNING:
>                     CPU: 0 PID: 218 at arch/x86/kernel/fpu/core.c:57
>                     x86_task_fpu+0x17/0x20
>            Product: Virtualization
>            Version: unspecified
>           Hardware: All
>                 OS: Linux
>             Status: NEW
>           Severity: normal
>           Priority: P3
>          Component: kvm
>           Assignee: virtualization_kvm@kernel-bugs.osdl.org
>           Reporter: hongyu.ning@intel.com
>         Regression: No
> 
> Created attachment 306485
>   --> https://bugzilla.kernel.org/attachment.cgi?id=306485&action=edit
> WARNING/BUG and Call Trace info in dmesg
> 
> in an regular linux-next guest kernel regression test setup, recently hit
> following BUG and WARNING, likely related to x86/fpu.

> [    1.962383]  ? fpstate_free+0x5/0x30

Yeah we run into the same thing on *all* boots on linux-next on kdevops
as well, Cc'ing kdevops list so folks are aware linux-next is broken
right now.

[   16.785349] BUG: kernel NULL pointer dereference, address:
0000000000000010
[   16.785353] #PF: supervisor read access in kernel mode
[  OK  ] Found device[   16.785354] #PF: error_code(0x0000) -
not-present page
 dev-disk-by\x2dlabel-…evice - QEMU NVMe Ctrl sparsefiles.
 [   16.785356] PGD 0 P4D 0
 [   16.785358] Oops: Oops: 0000 [#1] PREEMPT SMP NOPTI
 [   16.785361] CPU: 1 UID: 0 PID: 528 Comm: modprobe Tainted: G
 W          6.10.0-rc5-next-20240628+ #8
 [   16.785365] Tainted: [W]=WARN
 [   16.785366] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS
 1.16.3-debian-1.16.3-2 04/01/2014
 [   16.785367] RIP: 0010:fpstate_free+0x5/0x30
 [   16.785373] Code: 41 5c 41 5d 41 5e c3 cc cc cc cc 66 2e 0f 1f 84 00
 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 44 00
 00 <48> 8b 47 10 48 85 c0 74 11 48 83 c7 40 48
  39 f8 74 08 48 89 c7 e9
  [   16.785374] RSP: 0000:ffffb4dd80673e48 EFLAGS: 00010246
  [   16.785376] RAX: 0000000000000000 RBX: ffff8eca5fdd0000 RCX:
  00000000801c0012
  [   16.785378] RDX: ffff8eca54bef500 RSI: ffffffff8aa9b92d RDI:
  0000000000000000
  [   16.785379] RBP: ffff8ecabbc72840 R08: ffff8eca54bed100 R09:
  00000000801c0012
  [   16.785380] R10: 00000000801c0012 R11: 0000000000000001 R12:
  ffff8eca605dc800
  [   16.785381] R13: 0000000000030bc8 R14: ffff8ecabbc728b8 R15:
  0000000000000004
  [   16.785382] FS:  00007f26f73a35c0(0000) GS:ffff8ecabbc40000(0000)
  knlGS:0000000000000000
  [   16.785383] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [   16.785385] CR2: 0000000000000010 CR3: 00000001175b6006 CR4:
  0000000000770ef0
  [   16.785389] DR0: 0000000000000000 DR1: 0000000000000000 DR2:
  0000000000000000
  [   16.785390] DR3: 0000000000000000 DR6: 00000000fffe07f0 DR7:
  0000000000000400
  [   16.785391] PKRU: 55555554
  [   16.785392] Call Trace:
  [   16.785394]  <TASK>
  [   16.785396]  ? __die+0x1f/0x60
  [   16.785401]  ? page_fault_oops+0x158/0x460
  [   16.785406]  ? x86_task_fpu+0x17/0x20
  [   16.785410]  ? do_user_addr_fault+0x63/0x6c0
  [   16.785413]  ? exc_page_fault+0x79/0x190
  [   16.785417]  ? asm_exc_page_fault+0x22/0x30
  [   16.785420]  ? free_task+0x2d/0x70
  [   16.785424]  ? fpstate_free+0x5/0x30
  [   16.785427]  ? arch_release_task_struct+0x27/0x30
  [   16.785429]  free_task+0x35/0x70
  [   16.785432]  rcu_core+0x499/0x7d0
  [   16.785436]  ? rcu_core+0x434/0x7d0
  [   16.785440]  handle_softirqs+0xf9/0x300
  [   16.785444]  __irq_exit_rcu+0x6e/0xc0
  [   16.785446]  sysvec_apic_timer_interrupt+0x51/0xc0
  [   16.785450]  asm_sysvec_apic_timer_interrupt+0x16/0x20
  [   16.785452] RIP: 0033:0x7f26f74d0858

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