KCSAN: data-race in can_receive / can_stat

KCSAN: data-race in can_receive / can_stat_update
Status: auto-closed as invalid on 2020/04/09 06:18
Reported-by: syzbot+@syzkaller.appspotmail.com
First crash: 620d, last: 597d

similar bugs (1):
Kernel	Title	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in can_receive / can_stat_update (2)				1	172d	172d	0/22	auto-closed as invalid on 2021/05/04 12:50

Sample crash report:

==================================================================
BUG: KCSAN: data-race in can_receive / can_stat_update

write to 0xffff88809d4a2708 of 8 bytes by interrupt on cpu 1:
 can_receive+0x7b/0x230 net/can/af_can.c:646
 can_rcv+0xbd/0x120 net/can/af_can.c:686
 __netif_receive_skb_one_core+0xa7/0xe0 net/core/dev.c:5150
 __netif_receive_skb+0x37/0xf0 net/core/dev.c:5264
 process_backlog+0x207/0x4b0 net/core/dev.c:6095
 napi_poll net/core/dev.c:6532 [inline]
 net_rx_action+0x3ae/0xa90 net/core/dev.c:6600
 __do_softirq+0x115/0x33f kernel/softirq.c:292
 run_ksoftirqd+0x46/0x60 kernel/softirq.c:603
 smpboot_thread_fn+0x37d/0x4a0 kernel/smpboot.c:165
 kthread+0x1d4/0x200 drivers/block/aoe/aoecmd.c:1253
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:352

read to 0xffff88809d4a2708 of 8 bytes by interrupt on cpu 0:
 can_stat_update+0xa2/0x630 net/can/proc.c:135
 call_timer_fn+0x5f/0x2f0 kernel/time/timer.c:1404
 expire_timers kernel/time/timer.c:1449 [inline]
 __run_timers kernel/time/timer.c:1773 [inline]
 __run_timers kernel/time/timer.c:1740 [inline]
 run_timer_softirq+0xc0c/0xcd0 kernel/time/timer.c:1786
 __do_softirq+0x115/0x33f kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0xbb/0xe0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 smp_apic_timer_interrupt+0xe6/0x280 arch/x86/kernel/apic/apic.c:1137
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:829

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 27589 Comm: syz-executor.3 Not tainted 5.5.0-rc1-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
==================================================================

Crashes (3):
Manager	Time	Kernel	Commit	Syzkaller	Config	Log	Report
ci2-upstream-kcsan-gce	2020/01/30 06:18	https://github.com/google/ktsan.git kcsan	245a43005292	5ed23f9a	.config	log	report
ci2-upstream-kcsan-gce	2020/01/09 17:10	https://github.com/google/ktsan.git kcsan	245a43005292	4de4e9f0	.config	log	report
ci2-upstream-kcsan-gce	2020/01/07 12:38	https://github.com/google/ktsan.git kcsan	245a43005292	1bcd407e	.config	log	report