[moderation] [kernel?] KCSAN: data-race in advance_sched / hrtimer_start_range_ns

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: 4a7bbe7519b6 Merge tag 'scsi-fixes' of git://git.kernel.or..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=16b3e034180000
kernel config: https://syzkaller.appspot.com/x/.config?x=3cd0dc1b46a5bc5c
dashboard link: https://syzkaller.appspot.com/bug?extid=a268240594b9048ced2b
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
CC: [linux-...@vger.kernel.org tg...@linutronix.de]

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

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/903440c61bef/disk-4a7bbe75.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/9655b05e2f2b/vmlinux-4a7bbe75.xz
kernel image: https://storage.googleapis.com/syzbot-assets/4a4529a3d03b/bzImage-4a7bbe75.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+a26824...@syzkaller.appspotmail.com

==================================================================
BUG: KCSAN: data-race in advance_sched / hrtimer_start_range_ns

write to 0xffff88816e732de8 of 8 bytes by task 11669 on cpu 1:
hrtimer_set_expires_range_ns include/linux/hrtimer.h:214 [inline]
__hrtimer_start_range_ns kernel/time/hrtimer.c:1251 [inline]
hrtimer_start_range_ns+0x1a2/0x660 kernel/time/hrtimer.c:1301
hrtimer_start include/linux/hrtimer.h:378 [inline]
taprio_start_sched+0x81/0x90 net/sched/sch_taprio.c:1295
taprio_change+0x2670/0x28a0 net/sched/sch_taprio.c:1987
qdisc_change net/sched/sch_api.c:1416 [inline]
tc_modify_qdisc+0xee9/0x1040 net/sched/sch_api.c:1746
rtnetlink_rcv_msg+0x80a/0x8c0 net/core/rtnetlink.c:6615
netlink_rcv_skb+0x126/0x220 net/netlink/af_netlink.c:2543
rtnetlink_rcv+0x1c/0x20 net/core/rtnetlink.c:6633
netlink_unicast_kernel net/netlink/af_netlink.c:1341 [inline]
netlink_unicast+0x589/0x660 net/netlink/af_netlink.c:1367
netlink_sendmsg+0x66e/0x770 net/netlink/af_netlink.c:1908
sock_sendmsg_nosec net/socket.c:730 [inline]
__sock_sendmsg net/socket.c:745 [inline]
____sys_sendmsg+0x37c/0x4d0 net/socket.c:2584
___sys_sendmsg net/socket.c:2638 [inline]
__sys_sendmsg+0x1e9/0x270 net/socket.c:2667
__do_sys_sendmsg net/socket.c:2676 [inline]
__se_sys_sendmsg net/socket.c:2674 [inline]
__x64_sys_sendmsg+0x46/0x50 net/socket.c:2674
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xcd/0x1d0 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x63/0x6b

write to 0xffff88816e732de8 of 8 bytes by interrupt on cpu 0:
hrtimer_set_expires include/linux/hrtimer.h:203 [inline]
advance_sched+0x62b/0x6a0 net/sched/sch_taprio.c:994
__run_hrtimer kernel/time/hrtimer.c:1688 [inline]
__hrtimer_run_queues+0x217/0x710 kernel/time/hrtimer.c:1752
hrtimer_interrupt+0x20d/0x7b0 kernel/time/hrtimer.c:1814
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1065 [inline]
__sysvec_apic_timer_interrupt+0x52/0x190 arch/x86/kernel/apic/apic.c:1082
sysvec_apic_timer_interrupt+0x6a/0x80 arch/x86/kernel/apic/apic.c:1076
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:649
is_atomic kernel/kcsan/core.c:249 [inline]
should_watch kernel/kcsan/core.c:277 [inline]
check_access kernel/kcsan/core.c:752 [inline]
__tsan_read8+0xe4/0x180 kernel/kcsan/core.c:1025
batadv_nc_purge_paths+0x6d/0x260 net/batman-adv/network-coding.c:439
batadv_nc_worker+0x402/0xac0 net/batman-adv/network-coding.c:722
process_one_work kernel/workqueue.c:2633 [inline]
process_scheduled_works+0x5b8/0xa40 kernel/workqueue.c:2706
worker_thread+0x525/0x730 kernel/workqueue.c:2787
kthread+0x1d7/0x210 kernel/kthread.c:388
ret_from_fork+0x48/0x60 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242

value changed: 0x00000280562d0000 -> 0x00000280562e0000

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 PID: 11964 Comm: kworker/u4:2 Not tainted 6.8.0-rc3-syzkaller-00279-g4a7bbe7519b6 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Workqueue: bat_events batadv_nc_worker
==================================================================


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.