[rppt:hugetlb-init/v0] [dev] ac8d6455e4: PANIC:early_exception

Hello,

kernel test robot noticed "PANIC:early_exception" on:

commit: ac8d6455e4bbac839994bac1863b9017acb90c88 ("dev: Revert "mm/hugetlb: deal with multiple calls to hugetlb_bootmem_alloc"")
https://git.kernel.org/cgit/linux/kernel/git/rppt/linux.git hugetlb-init/v0

in testcase: boot

config: x86_64-randconfig-014-20251225
compiler: clang-20
test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 32G

(please refer to attached dmesg/kmsg for entire log/backtrace)



If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <[email protected]>
| Closes: https://lore.kernel.org/oe-lkp/[email protected]


[    1.747357][    T0] PM: hibernation: Registered nosave memory: [mem 0x0009f000-0x000fffff]
[    1.748440][    T0] PM: hibernation: Registered nosave memory: [mem 0xbffe0000-0xffffffff]
[    1.749535][    T0] [mem 0xc0000000-0xfeffbfff] available for PCI devices
[    1.750441][    T0] Booting paravirtualized kernel on KVM
[    1.751160][    T0] clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 6370452778343963 ns
PANIC: early exception 0x0c IP 10:ffffffff85c3e5eb error 0 cr2 0xffff88883ffff000
[    1.773701][    T0] CPU: 0 UID: 0 PID: 0 Comm: swapper Not tainted 6.19.0-rc1-00027-gac8d6455e4bb #1 PREEMPT(undef)
[    1.775093][    T0] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[    1.776471][    T0] RIP: 0010:hugetlb_vmemmap_init_early (kbuild/src/consumer/mm/hugetlb_vmemmap.c:758)
[    1.777364][    T0] Code: 3f 83 fb 41 0f 83 c2 02 00 00 4c 3b 7c 24 20 0f 84 b7 03 00 00 8a 05 04 5a 20 ff 3c 01 75 c0 4d 8d 67 10 4c 89 e5 48 c1 ed 03 <80> 7c 15 00 00 74 12 4c 89 e7 e8 e6 24 d5 fb 48 ba 00 00 00 00 00
All code
========
   0:	3f                   	(bad)
   1:	83 fb 41             	cmp    $0x41,%ebx
   4:	0f 83 c2 02 00 00    	jae    0x2cc
   a:	4c 3b 7c 24 20       	cmp    0x20(%rsp),%r15
   f:	0f 84 b7 03 00 00    	je     0x3cc
  15:	8a 05 04 5a 20 ff    	mov    -0xdfa5fc(%rip),%al        # 0xffffffffff205a1f
  1b:	3c 01                	cmp    $0x1,%al
  1d:	75 c0                	jne    0xffffffffffffffdf
  1f:	4d 8d 67 10          	lea    0x10(%r15),%r12
  23:	4c 89 e5             	mov    %r12,%rbp
  26:	48 c1 ed 03          	shr    $0x3,%rbp
  2a:*	80 7c 15 00 00       	cmpb   $0x0,0x0(%rbp,%rdx,1)		<-- trapping instruction
  2f:	74 12                	je     0x43
  31:	4c 89 e7             	mov    %r12,%rdi
  34:	e8 e6 24 d5 fb       	call   0xfffffffffbd5251f
  39:	48                   	rex.W
  3a:	ba 00 00 00 00       	mov    $0x0,%edx
	...

Code starting with the faulting instruction
===========================================
   0:	80 7c 15 00 00       	cmpb   $0x0,0x0(%rbp,%rdx,1)
   5:	74 12                	je     0x19
   7:	4c 89 e7             	mov    %r12,%rdi
   a:	e8 e6 24 d5 fb       	call   0xfffffffffbd524f5
   f:	48                   	rex.W
  10:	ba 00 00 00 00       	mov    $0x0,%edx
	...
[    1.779986][    T0] RSP: 0000:ffffffff84807cf0 EFLAGS: 00010002 ORIG_RAX: 0000000000000000
[    1.781096][    T0] RAX: 1ffffffff0ba2b01 RBX: 0000000000000000 RCX: 0000000000000000
[    1.782156][    T0] RDX: dffffc0000000000 RSI: ffffffff869f7738 RDI: 0000000000000000
[    1.783242][    T0] RBP: 0000000000000002 R08: 0000000000000020 R09: 000000000001fb80
[    1.784333][    T0] R10: 000000083ffe0480 R11: ffffffff00000020 R12: 0000000000000010
[    1.785292][    T0] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[    1.786174][    T0] FS:  0000000000000000(0000) GS:0000000000000000(0000) knlGS:0000000000000000
[    1.787169][    T0] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    1.787906][    T0] CR2: ffff88883ffff000 CR3: 0000000004867000 CR4: 00000000000000b0
[    1.788857][    T0] Call Trace:
[    1.789309][    T0]  <TASK>
[    1.789719][    T0]  sparse_init_nid (kbuild/src/consumer/include/linux/mmzone.h:2260 (discriminator 1) kbuild/src/consumer/mm/sparse.c:549 (discriminator 1))
[    1.790364][    T0]  sparse_init (kbuild/src/consumer/mm/sparse.c:624)
[    1.790957][    T0]  zone_limits_init (kbuild/src/consumer/mm/mm_init.c:1819)
[    1.791606][    T0]  ? find_held_lock (kbuild/src/consumer/kernel/locking/lockdep.c:5350)


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20251229/[email protected]



-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki