[rppt:uffd+guestmemfd/v1] [mm] 434b076f19: Oops:general_protection_fault,probably_for_non-canonical_address#:#[##]SMP_KASAN

Hello,

kernel test robot noticed "Oops:general_protection_fault,probably_for_non-canonical_address#:#[##]SMP_KASAN" on:

commit: 434b076f194575bb3b654f784d6c6c4941dd7d7c ("mm: generalize handling of userfaults in __do_fault()")
https://git.kernel.org/cgit/linux/kernel/git/rppt/linux.git uffd+guestmemfd/v1

in testcase: boot

config: x86_64-randconfig-006-20260225
compiler: gcc-14
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]



[   16.977978][    T1] krb5: Running aes256-cts-hmac-sha384-192 prf
[   16.979677][    T1] krb5: Running aes128-cts-hmac-sha256-128 key
[   16.981543][    T1] krb5: Running aes256-cts-hmac-sha384-192 key
[   16.983376][    T1] krb5: Running camellia128-cts-cmac key
[   30.544255][   T30] Freeing initrd memory: 131356K
[   30.549597][   T61] Oops: general protection fault, probably for non-canonical address 0xdffffc000000000b: 0000 [#1] SMP KASAN
[   30.550537][   T61] KASAN: null-ptr-deref in range [0x0000000000000058-0x000000000000005f]
[   30.550537][   T61] CPU: 0 UID: 0 PID: 61 Comm: modprobe Tainted: G                T   7.0.0-rc1-00012-g434b076f1945 #1 PREEMPT(lazy)  45cb5da13f758fa7ca78e6625d0b3401df01cbcf
[   30.550537][   T61] Tainted: [T]=RANDSTRUCT
[   30.550537][   T61] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
[   30.550537][   T61] RIP: 0010:__do_fault (kbuild/src/consumer/include/linux/fs.h:1352 kbuild/src/consumer/mm/memory.c:5335 kbuild/src/consumer/mm/memory.c:5401)
[   30.550537][   T61] Code: c1 ea 03 80 3c 02 00 74 05 e8 f1 9c 0a 00 4c 8b a5 d0 00 00 00 b8 ff ff 37 00 48 c1 e0 2a 49 8d 7c 24 58 48 89 fa 48 c1 ea 03 <80> 3c 02 00 74 05 e8 ca 9c 0a 00 4d 8b 6c 24 58 4c 8d 65 20 b8 ff
All code
========
   0:	c1 ea 03             	shr    $0x3,%edx
   3:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   7:	74 05                	je     0xe
   9:	e8 f1 9c 0a 00       	call   0xa9cff
   e:	4c 8b a5 d0 00 00 00 	mov    0xd0(%rbp),%r12
  15:	b8 ff ff 37 00       	mov    $0x37ffff,%eax
  1a:	48 c1 e0 2a          	shl    $0x2a,%rax
  1e:	49 8d 7c 24 58       	lea    0x58(%r12),%rdi
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
  2a:*	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)		<-- trapping instruction
  2e:	74 05                	je     0x35
  30:	e8 ca 9c 0a 00       	call   0xa9cff
  35:	4d 8b 6c 24 58       	mov    0x58(%r12),%r13
  3a:	4c 8d 65 20          	lea    0x20(%rbp),%r12
  3e:	b8                   	.byte 0xb8
  3f:	ff                   	.byte 0xff

Code starting with the faulting instruction
===========================================
   0:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   4:	74 05                	je     0xb
   6:	e8 ca 9c 0a 00       	call   0xa9cd5
   b:	4d 8b 6c 24 58       	mov    0x58(%r12),%r13
  10:	4c 8d 65 20          	lea    0x20(%rbp),%r12
  14:	b8                   	.byte 0xb8
  15:	ff                   	.byte 0xff
[   30.550537][   T61] RSP: 0000:ffff8881084f7cc8 EFLAGS: 00010202
[   30.550537][   T61] RAX: dffffc0000000000 RBX: ffff8881084f7dd8 RCX: ffff8881084f7d2c
[   30.550537][   T61] RDX: 000000000000000b RSI: ffffffff84fcb2c0 RDI: 0000000000000058
[   30.550537][   T61] RBP: ffff8881247def00 R08: 0000000000000000 R09: 0000000000000000
[   30.550537][   T61] R10: 0000000000000000 R11: ffffffff85c4a357 R12: 0000000000000000
[   30.550537][   T61] R13: 00007f05c18e8000 R14: 0000000000000254 R15: ffff8881247def00
[   30.550537][   T61] FS:  0000000000000000(0000) GS:ffff888798911000(0000) knlGS:0000000000000000
[   30.550537][   T61] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   30.550537][   T61] CR2: 00007f05c18e8020 CR3: 000000012af53000 CR4: 00000000000406f0
[   30.550537][   T61] Call Trace:
[   30.550537][   T61]  <TASK>
[   30.550537][   T61]  do_read_fault (kbuild/src/consumer/mm/memory.c:5840)
[   30.550537][   T61]  do_pte_missing (kbuild/src/consumer/mm/memory.c:5974 kbuild/src/consumer/mm/memory.c:4477)
[   30.550537][   T61]  __handle_mm_fault (kbuild/src/consumer/mm/memory.c:6358 kbuild/src/consumer/mm/memory.c:6496)
[   30.550537][   T61]  ? remap_pfn_range_complete (kbuild/src/consumer/mm/memory.c:6398)


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20260226/[email protected]



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