linux-kernel - [syzbot] [scsi?] upstream test error: KMSAN: uninit-value in scsi_get_vpd

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Message-ID: <68e6c0fe.050a0220.256323.00fd.GAE@google.com>
Date: Wed, 08 Oct 2025 12:52:30 -0700
From: syzbot <syzbot+a7b56f5926d90eaf5071@...kaller.appspotmail.com>
To: James.Bottomley@...senPartnership.com, linux-kernel@...r.kernel.org, 
	linux-scsi@...r.kernel.org, martin.petersen@...cle.com, 
	syzkaller-bugs@...glegroups.com
Subject: [syzbot] [scsi?] upstream test error: KMSAN: uninit-value in scsi_get_vpd_buf

Hello,

syzbot found the following issue on:

HEAD commit:    971199ad2a0f Merge tag 'arm64-fixes' of git://git.kernel.o..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1415792f980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=ed013bd3465f2abf
dashboard link: https://syzkaller.appspot.com/bug?extid=a7b56f5926d90eaf5071
compiler:       Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/32974b5d3b23/disk-971199ad.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/3850d8c7dc24/vmlinux-971199ad.xz
kernel image: https://storage.googleapis.com/syzbot-assets/6ab0a4c5a862/bzImage-971199ad.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a7b56f5926d90eaf5071@...kaller.appspotmail.com

scsi 0:0:1:0: Direct-Access     Google   PersistentDisk   1    PQ: 0 ANSI: 6
=====================================================
BUG: KMSAN: uninit-value in scsi_vpd_inquiry drivers/scsi/scsi.c:323 [inline]
BUG: KMSAN: uninit-value in scsi_get_vpd_buf+0x4cc/0x720 drivers/scsi/scsi.c:455
 scsi_vpd_inquiry drivers/scsi/scsi.c:323 [inline]
 scsi_get_vpd_buf+0x4cc/0x720 drivers/scsi/scsi.c:455
 scsi_update_vpd_page drivers/scsi/scsi.c:479 [inline]
 scsi_attach_vpd+0x380/0xe70 drivers/scsi/scsi.c:520
 scsi_add_lun drivers/scsi/scsi_scan.c:1110 [inline]
 scsi_probe_and_add_lun+0x6933/0x7f20 drivers/scsi/scsi_scan.c:1288
 __scsi_scan_target+0x2fb/0x2050 drivers/scsi/scsi_scan.c:1776
 scsi_scan_channel drivers/scsi/scsi_scan.c:1864 [inline]
 scsi_scan_host_selected+0x68f/0x9a0 drivers/scsi/scsi_scan.c:1893
 do_scsi_scan_host drivers/scsi/scsi_scan.c:2032 [inline]
 do_scan_async+0x1ad/0xdc0 drivers/scsi/scsi_scan.c:2042
 async_run_entry_fn+0x90/0x570 kernel/async.c:129
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xb91/0x1d80 kernel/workqueue.c:3346
 worker_thread+0xedf/0x1590 kernel/workqueue.c:3427
 kthread+0xd59/0xf00 kernel/kthread.c:463
 ret_from_fork+0x233/0x380 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

Uninit was created at:
 __alloc_frozen_pages_noprof+0x689/0xf00 mm/page_alloc.c:5206
 alloc_pages_mpol+0x328/0x860 mm/mempolicy.c:2416
 alloc_frozen_pages_noprof+0xf7/0x200 mm/mempolicy.c:2487
 alloc_slab_page mm/slub.c:3030 [inline]
 allocate_slab+0x26c/0x14e0 mm/slub.c:3203
 new_slab mm/slub.c:3257 [inline]
 ___slab_alloc+0x131b/0x3d90 mm/slub.c:4627
 __slab_alloc+0xa3/0x180 mm/slub.c:4746
 __slab_alloc_node mm/slub.c:4822 [inline]
 slab_alloc_node mm/slub.c:5233 [inline]
 __do_kmalloc_node mm/slub.c:5602 [inline]
 __kmalloc_noprof+0xba3/0x1b40 mm/slub.c:5615
 kmalloc_noprof include/linux/slab.h:961 [inline]
 kzalloc_noprof include/linux/slab.h:1094 [inline]
 lsm_blob_alloc security/security.c:690 [inline]
 lsm_task_alloc security/security.c:777 [inline]
 security_task_alloc+0xa1/0x6b0 security/security.c:3229
 copy_process+0x235a/0x5eb0 kernel/fork.c:2163
 kernel_clone+0x416/0x1080 kernel/fork.c:2609
 user_mode_thread+0xde/0x110 kernel/fork.c:2685
 call_usermodehelper_exec_work+0x8a/0x300 kernel/umh.c:171
 process_one_work kernel/workqueue.c:3263 [inline]
 process_scheduled_works+0xb91/0x1d80 kernel/workqueue.c:3346
 worker_thread+0xedf/0x1590 kernel/workqueue.c:3427
 kthread+0xd59/0xf00 kernel/kthread.c:463
 ret_from_fork+0x233/0x380 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

CPU: 1 UID: 0 PID: 58 Comm: kworker/u8:3 Not tainted syzkaller #0 PREEMPT(none) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: async async_run_entry_fn
=====================================================


---
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