linux-kernel - [syzbot] [kernel?] KCSAN: data-race in next_expiry_recalc / update_process

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Message-ID: <000000000000916e55061f969e14@google.com>
Date: Tue, 13 Aug 2024 13:40:26 -0700
From: syzbot <syzbot+bf285fcc0a048e028118@...kaller.appspotmail.com>
To: anna-maria@...utronix.de, frederic@...nel.org, 
	linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com, 
	tglx@...utronix.de
Subject: [syzbot] [kernel?] KCSAN: data-race in next_expiry_recalc /
 update_process_times (2)

Hello,

syzbot found the following issue on:

HEAD commit:    6b4aa469f049 Merge tag '6.11-rc3-ksmbd-fixes' of git://git..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=157bd96b980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=31ece081c16313f0
dashboard link: https://syzkaller.appspot.com/bug?extid=bf285fcc0a048e028118
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/cf019ab0b1a3/disk-6b4aa469.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/b052d8a52fbd/vmlinux-6b4aa469.xz
kernel image: https://storage.googleapis.com/syzbot-assets/07bf313382f0/bzImage-6b4aa469.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+bf285fcc0a048e028118@...kaller.appspotmail.com

==================================================================
BUG: KCSAN: data-race in next_expiry_recalc / update_process_times

write to 0xffff888237c1de58 of 8 bytes by interrupt on cpu 1:
 next_expiry_recalc+0x187/0x1e0 kernel/time/timer.c:1967
 __run_timers kernel/time/timer.c:2414 [inline]
 __run_timer_base+0x2ee/0x640 kernel/time/timer.c:2428
 timer_expire_remote+0x2f/0x40 kernel/time/timer.c:2180
 tmigr_handle_remote_cpu kernel/time/timer_migration.c:930 [inline]
 tmigr_handle_remote_up kernel/time/timer_migration.c:1021 [inline]
 __walk_groups kernel/time/timer_migration.c:533 [inline]
 tmigr_handle_remote+0x4f6/0x940 kernel/time/timer_migration.c:1080
 run_timer_softirq+0x5f/0x70 kernel/time/timer.c:2451
 handle_softirqs+0xc3/0x280 kernel/softirq.c:554
 __do_softirq kernel/softirq.c:588 [inline]
 invoke_softirq kernel/softirq.c:428 [inline]
 __irq_exit_rcu kernel/softirq.c:637 [inline]
 irq_exit_rcu+0x3e/0x90 kernel/softirq.c:649
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0x73/0x80 arch/x86/kernel/apic/apic.c:1043
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
 syscall_enter_from_user_mode_work include/linux/entry-common.h:165 [inline]
 syscall_enter_from_user_mode include/linux/entry-common.h:198 [inline]
 do_syscall_64+0x9a/0x1c0 arch/x86/entry/common.c:79
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffff888237c1de58 of 8 bytes by interrupt on cpu 0:
 run_local_timers kernel/time/timer.c:2466 [inline]
 update_process_times+0x8a/0x180 kernel/time/timer.c:2484
 tick_sched_handle kernel/time/tick-sched.c:276 [inline]
 tick_nohz_handler+0x250/0x2d0 kernel/time/tick-sched.c:297
 __run_hrtimer kernel/time/hrtimer.c:1689 [inline]
 __hrtimer_run_queues+0x20d/0x5e0 kernel/time/hrtimer.c:1753
 hrtimer_interrupt+0x210/0x7b0 kernel/time/hrtimer.c:1815
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1032 [inline]
 __sysvec_apic_timer_interrupt+0x5c/0x1a0 arch/x86/kernel/apic/apic.c:1049
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1043 [inline]
 sysvec_apic_timer_interrupt+0x6e/0x80 arch/x86/kernel/apic/apic.c:1043
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
 native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
 arch_safe_halt arch/x86/include/asm/irqflags.h:106 [inline]
 acpi_safe_halt+0x21/0x30 drivers/acpi/processor_idle.c:111
 acpi_idle_do_entry+0x1d/0x30 drivers/acpi/processor_idle.c:568
 acpi_idle_enter+0x96/0xb0 drivers/acpi/processor_idle.c:702
 cpuidle_enter_state+0xcf/0x270 drivers/cpuidle/cpuidle.c:267
 cpuidle_enter+0x40/0x70 drivers/cpuidle/cpuidle.c:388
 call_cpuidle kernel/sched/idle.c:155 [inline]
 cpuidle_idle_call kernel/sched/idle.c:230 [inline]
 do_idle+0x195/0x230 kernel/sched/idle.c:326
 cpu_startup_entry+0x25/0x30 kernel/sched/idle.c:424
 rest_init+0xef/0xf0 init/main.c:747
 start_kernel+0x581/0x5e0 init/main.c:1103
 x86_64_start_reservations+0x2a/0x30 arch/x86/kernel/head64.c:507
 x86_64_start_kernel+0x9a/0xa0 arch/x86/kernel/head64.c:488
 common_startup_64+0x12c/0x137

value changed: 0x00000000fffff045 -> 0x00000000fffff048

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.11.0-rc3-syzkaller-00010-g6b4aa469f049 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024
==================================================================


---
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