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KCSAN: data-race in batadv_iv_ogm_schedule / batadv_update_min_mtu (3)

Status: auto-obsoleted due to no activity on 2024/10/22 14:26
Subsystems: batman
[Documentation on labels]
First crash: 170d, last: 148d
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KCSAN: data-race in batadv_iv_ogm_schedule / batadv_update_min_mtu (2) batman 1 316d 316d 0/28 auto-obsoleted due to no activity on 2024/05/08 07:06
upstream KCSAN: data-race in batadv_iv_ogm_schedule / batadv_update_min_mtu batman 1 1610d 1610d 0/28 auto-closed as invalid on 2020/10/22 07:32
upstream KCSAN: data-race in batadv_iv_ogm_schedule / batadv_update_min_mtu (4) batman 1 103d 103d 0/28 auto-obsoleted due to no activity on 2024/12/28 09:36

Sample crash report:
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3e) already exists on: batadv_slave_0
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
batman_adv: batadv0: Interface activated: batadv_slave_0
==================================================================
BUG: KCSAN: data-race in batadv_iv_ogm_schedule / batadv_update_min_mtu

write to 0xffff888117c4e010 of 1 bytes by task 11 on cpu 1:
 batadv_iv_ogm_schedule_buff net/batman-adv/bat_iv_ogm.c:803 [inline]
 batadv_iv_ogm_schedule+0xaa/0x790 net/batman-adv/bat_iv_ogm.c:868
 batadv_iv_send_outstanding_bat_ogm_packet+0x44c/0x4b0 net/batman-adv/bat_iv_ogm.c:1712
 process_one_work kernel/workqueue.c:3231 [inline]
 process_scheduled_works+0x483/0x9a0 kernel/workqueue.c:3312
 worker_thread+0x51d/0x6f0 kernel/workqueue.c:3393
 kthread+0x1d1/0x210 kernel/kthread.c:389
 ret_from_fork+0x4b/0x60 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244

read to 0xffff888117c4e010 of 1 bytes by task 14600 on cpu 0:
 batadv_hardif_min_mtu net/batman-adv/hard-interface.c:589 [inline]
 batadv_update_min_mtu+0x4b/0x180 net/batman-adv/hard-interface.c:638
 batadv_hardif_activate_interface+0x1f7/0x330 net/batman-adv/hard-interface.c:678
 batadv_hard_if_event+0x47a/0x1010 net/batman-adv/hard-interface.c:977
 notifier_call_chain kernel/notifier.c:93 [inline]
 raw_notifier_call_chain+0x6f/0x1d0 kernel/notifier.c:461
 call_netdevice_notifiers_info+0xae/0x100 net/core/dev.c:1996
 __dev_notify_flags+0xff/0x1a0
 dev_change_flags+0xab/0xd0 net/core/dev.c:8914
 do_setlink+0x844/0x2490 net/core/rtnetlink.c:2900
 __rtnl_newlink net/core/rtnetlink.c:3696 [inline]
 rtnl_newlink+0x11a3/0x1690 net/core/rtnetlink.c:3743
 rtnetlink_rcv_msg+0x6aa/0x710 net/core/rtnetlink.c:6646
 netlink_rcv_skb+0x12c/0x230 net/netlink/af_netlink.c:2550
 rtnetlink_rcv+0x1c/0x30 net/core/rtnetlink.c:6664
 netlink_unicast_kernel net/netlink/af_netlink.c:1331 [inline]
 netlink_unicast+0x599/0x670 net/netlink/af_netlink.c:1357
 netlink_sendmsg+0x5cc/0x6e0 net/netlink/af_netlink.c:1901
 sock_sendmsg_nosec net/socket.c:730 [inline]
 __sock_sendmsg+0x140/0x180 net/socket.c:745
 __sys_sendto+0x1d9/0x250 net/socket.c:2210
 __do_sys_sendto net/socket.c:2222 [inline]
 __se_sys_sendto net/socket.c:2218 [inline]
 __x64_sys_sendto+0x78/0x90 net/socket.c:2218
 x64_sys_call+0x2959/0x2d60 arch/x86/include/generated/asm/syscalls_64.h:45
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xc9/0x1c0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x04 -> 0x03

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 14600 Comm: syz-executor Not tainted 6.11.0-syzkaller-02574-ga430d95c5efa #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
==================================================================
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3f) already exists on: batadv_slave_1
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3f) already exists on: batadv_slave_1
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
batman_adv: The newly added mac address (aa:aa:aa:aa:aa:3f) already exists on: batadv_slave_1
batman_adv: It is strongly recommended to keep mac addresses unique to avoid problems!
batman_adv: batadv0: Interface activated: batadv_slave_1
netdevsim netdevsim1 netdevsim0: set [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim1 netdevsim1: set [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim1 netdevsim2: set [1, 0] type 2 family 0 port 6081 - 0
netdevsim netdevsim1 netdevsim3: set [1, 0] type 2 family 0 port 6081 - 0

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/09/17 14:26 upstream a430d95c5efa c673ca06 .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in batadv_iv_ogm_schedule / batadv_update_min_mtu
2024/09/10 08:08 upstream bc83b4d1f086 784df80e .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in batadv_iv_ogm_schedule / batadv_update_min_mtu
2024/08/27 12:04 upstream 3e9bff3bbe13 9aee4e0b .config console log report info [disk image] [vmlinux] [kernel image] ci2-upstream-kcsan-gce KCSAN: data-race in batadv_iv_ogm_schedule / batadv_update_min_mtu
* Struck through repros no longer work on HEAD.