linux-kernel - [syzbot] [kernel?] KMSAN: uninit-value in profile

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Message-ID: <000000000000d6b55e060d6bc390@google.com>
Date: Tue, 26 Dec 2023 07:59:18 -0800
From: syzbot <syzbot+b1a83ab2a9eb9321fbdd@...kaller.appspotmail.com>
To: akpm@...ux-foundation.org, ebiederm@...ssion.com, glider@...gle.com, 
	linux-kernel@...r.kernel.org, paskripkin@...il.com, 
	penguin-kernel@...ove.SAKURA.ne.jp, rostedt@...dmis.org, 
	syzkaller-bugs@...glegroups.com, tglx@...utronix.de
Subject: [syzbot] [kernel?] KMSAN: uninit-value in profile_hits (3)

Hello,

syzbot found the following issue on:

HEAD commit:    1978a14f70af x86: kmsan: enable KMSAN builds for x86
git tree:       https://github.com/google/kmsan.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=13b7a95b700000
kernel config:  https://syzkaller.appspot.com/x/.config?x=d830111cc3be873
dashboard link: https://syzkaller.appspot.com/bug?extid=b1a83ab2a9eb9321fbdd
compiler:       clang version 14.0.0 (/usr/local/google/src/llvm-git-monorepo 2b554920f11c8b763cd9ed9003f4e19b919b8e1f), GNU ld (GNU Binutils for Debian) 2.35.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14b5476b700000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=142c9237700000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b1a83ab2a9eb9321fbdd@...kaller.appspotmail.com

=====================================================
BUG: KMSAN: uninit-value in do_profile_hits kernel/profile.c:236 [inline]
BUG: KMSAN: uninit-value in profile_hits+0xaf2/0x1260 kernel/profile.c:326
 do_profile_hits kernel/profile.c:236 [inline]
 profile_hits+0xaf2/0x1260 kernel/profile.c:326
 profile_hit include/linux/profile.h:58 [inline]
 profile_tick+0x241/0x250 kernel/profile.c:336
 tick_sched_handle kernel/time/tick-sched.c:227 [inline]
 tick_sched_timer+0x4bd/0x610 kernel/time/tick-sched.c:1428
 __run_hrtimer+0x49f/0xc50 kernel/time/hrtimer.c:1685
 __hrtimer_run_queues kernel/time/hrtimer.c:1749 [inline]
 hrtimer_interrupt+0x7f7/0x2100 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0x178/0x5e0 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x9d/0xc0 arch/x86/kernel/apic/apic.c:1097
 asm_sysvec_apic_timer_interrupt+0x12/0x20
 __raw_spin_unlock_irq include/linux/spinlock_api_smp.h:160 [inline]
 _raw_spin_unlock_irq+0x36/0x60 kernel/locking/spinlock.c:202
 spin_unlock_irq include/linux/spinlock.h:399 [inline]
 __set_current_blocked+0xb0c/0xb90 kernel/signal.c:3051
 sigprocmask kernel/signal.c:3085 [inline]
 __do_sys_rt_sigprocmask kernel/signal.c:3162 [inline]
 __se_sys_rt_sigprocmask+0x438/0x5b0 kernel/signal.c:3145
 __x64_sys_rt_sigprocmask+0x11e/0x170 kernel/signal.c:3145
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x54/0xd0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x44/0xae

Local variable iter.i created at:
 new_sync_read fs/read_write.c:393 [inline]
 vfs_read+0xb8a/0x1980 fs/read_write.c:481
 ksys_read+0x28b/0x510 fs/read_write.c:619

CPU: 1 PID: 3474 Comm: sshd Not tainted 5.17.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
=====================================================


---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@...glegroups.com.

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