syzbot


KMSAN: uninit-value in load_balance (2)

Status: auto-closed as invalid on 2022/03/28 02:07
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 333d, last: 333d

Sample crash report:
=====================================================
BUG: KMSAN: uninit-value in should_we_balance kernel/sched/fair.c:9825 [inline]
BUG: KMSAN: uninit-value in load_balance+0x9de/0x47b0 kernel/sched/fair.c:9873
 should_we_balance kernel/sched/fair.c:9825 [inline]
 load_balance+0x9de/0x47b0 kernel/sched/fair.c:9873
 rebalance_domains+0x7ab/0x1070 kernel/sched/fair.c:10314
 run_rebalance_domains+0x1c3/0x230 kernel/sched/fair.c:11003
 __do_softirq+0x1ee/0x7c5 kernel/softirq.c:558
 run_ksoftirqd+0x33/0x50 kernel/softirq.c:921
 smpboot_thread_fn+0x606/0xbd0 kernel/smpboot.c:164
 kthread+0x721/0x850 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30

Uninit was stored to memory at:
 load_balance+0x3ba6/0x47b0 kernel/sched/fair.c:9856
 rebalance_domains+0x7ab/0x1070 kernel/sched/fair.c:10314
 run_rebalance_domains+0x1c3/0x230 kernel/sched/fair.c:11003
 __do_softirq+0x1ee/0x7c5 kernel/softirq.c:558

Local variable regs created at:
 __bpf_prog_run32+0x84/0x180 kernel/bpf/core.c:1795
 bpf_dispatcher_nop_func include/linux/bpf.h:727 [inline]
 __bpf_prog_run include/linux/filter.h:626 [inline]
 bpf_prog_run include/linux/filter.h:633 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:1937 [inline]
 bpf_trace_run1+0xda/0x310 kernel/trace/bpf_trace.c:1973

CPU: 1 PID: 18 Comm: ksoftirqd/1 Not tainted 5.16.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
=====================================================

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kmsan-gce-386 2021/12/28 02:04 https://github.com/google/kmsan.git master 81c325bbf94e 6b3c5e64 .config log report info KMSAN: uninit-value in load_balance
* Struck through repros no longer work on HEAD.