KCSAN: data-race in _extract_crng / crng

Kernel	Title	Rank 🛈	Repro	Cause bisect	Fix bisect	Count	Last	Reported	Patched	Status
upstream	KCSAN: data-race in _extract_crng / crng_reseed kernel	6				2	1961d	1977d	0/29	auto-closed as invalid on 2020/09/29 18:37
upstream	KCSAN: data-race in _extract_crng / crng_reseed (3) kernel	6				1	1637d	1637d	0/29	auto-closed as invalid on 2021/09/03 03:07

================================================================== BUG: KCSAN: data-race in _extract_crng / crng_reseed write to 0xffffffff88bef888 of 8 bytes by task 9569 on cpu 0: crng_reseed+0x399/0x630 drivers/char/random.c:975 _extract_crng+0xca/0x2b0 drivers/char/random.c:1006 crng_reseed+0x69/0x630 drivers/char/random.c:962 _extract_crng+0xca/0x2b0 drivers/char/random.c:1006 extract_crng drivers/char/random.c:1026 [inline] _get_random_bytes+0x141/0x240 drivers/char/random.c:1562 get_random_bytes+0x65/0x110 drivers/char/random.c:1575 eth_random_addr include/linux/etherdevice.h:225 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:520 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:570 [inline] nsim_dev_trap_report_work+0x217/0x5b0 drivers/net/netdevsim/dev.c:611 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275 worker_thread+0x635/0xb90 kernel/workqueue.c:2421 kthread+0x1fd/0x220 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 read to 0xffffffff88bef888 of 8 bytes by task 19 on cpu 1: _extract_crng+0x45/0x2b0 drivers/char/random.c:1004 crng_reseed+0x69/0x630 drivers/char/random.c:962 _extract_crng+0xca/0x2b0 drivers/char/random.c:1006 extract_crng drivers/char/random.c:1026 [inline] _get_random_bytes+0x141/0x240 drivers/char/random.c:1562 get_random_bytes+0x65/0x110 drivers/char/random.c:1575 eth_random_addr include/linux/etherdevice.h:225 [inline] nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:520 [inline] nsim_dev_trap_report drivers/net/netdevsim/dev.c:570 [inline] nsim_dev_trap_report_work+0x217/0x5b0 drivers/net/netdevsim/dev.c:611 process_one_work+0x3e1/0x950 kernel/workqueue.c:2275 worker_thread+0x635/0xb90 kernel/workqueue.c:2421 kthread+0x1fd/0x220 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 Reported by Kernel Concurrency Sanitizer on: CPU: 1 PID: 19 Comm: kworker/1:0 Not tainted 5.11.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events nsim_dev_trap_report_work ==================================================================