Hello,
syzbot found the following issue on:
HEAD commit: ba4f184e Linux 5.9-rc6
git tree: upstream
console output:
https://syzkaller.appspot.com/x/log.txt?x=12ef08ad900000
kernel config:
https://syzkaller.appspot.com/x/.config?x=7b00edac59eadd4a
dashboard link:
https://syzkaller.appspot.com/bug?extid=56078ac0b9071335a745
compiler: clang version 11.0.0 (
https://github.com/llvm/llvm-project.git ca2dcbd030eadbf0aa9b660efe864ff08af6e18b)
CC: [
fwei...@gmail.com linux-...@vger.kernel.org mi...@kernel.org tg...@linutronix.de]
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by:
syzbot+56078a...@syzkaller.appspotmail.com
==================================================================
BUG: KCSAN: data-race in tick_nohz_next_event / tick_nohz_stop_tick
write to 0xffffffff88164590 of 4 bytes by task 0 on cpu 0:
tick_nohz_stop_tick+0xa0/0x440 kernel/time/tick-sched.c:789
__tick_nohz_idle_stop_tick kernel/time/tick-sched.c:981 [inline]
tick_nohz_idle_stop_tick+0xf2/0x1c0 kernel/time/tick-sched.c:1002
cpuidle_idle_call kernel/sched/idle.c:209 [inline]
do_idle+0x1ca/0x2c0 kernel/sched/idle.c:273
cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:369
rest_init+0xd8/0xe0 init/main.c:708
arch_call_rest_init+0xa/0xb
start_kernel+0x608/0x6d0 init/main.c:1048
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243
read to 0xffffffff88164590 of 4 bytes by task 0 on cpu 1:
tick_nohz_next_event+0x21d/0x310 kernel/time/tick-sched.c:754
tick_nohz_get_sleep_length+0xca/0x140 kernel/time/tick-sched.c:1107
menu_select+0x328/0x1030 drivers/cpuidle/governors/menu.c:283
cpuidle_select+0x3d/0x50 drivers/cpuidle/cpuidle.c:331
cpuidle_idle_call kernel/sched/idle.c:206 [inline]
do_idle+0x1ae/0x2c0 kernel/sched/idle.c:273
cpu_startup_entry+0x15/0x20 kernel/sched/idle.c:369
secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:243
Reported by Kernel Concurrency Sanitizer on:
CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.9.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================
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