syzbot


WARNING in kcov_remote_start

Status: upstream: reported on 2025/06/28 15:34
Reported-by: syzbot+e64fc7c934fb30351dfe@syzkaller.appspotmail.com
First crash: 111d, last: 7d21h
Similar bugs (7)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 WARNING in kcov_remote_start -1 4 281d 380d 0/3 auto-obsoleted due to no activity on 2025/04/19 19:40
upstream WARNING in kcov_remote_start (4) usb -1 107983 464d 495d 26/29 fixed on 2024/07/10 08:24
upstream WARNING in kcov_remote_start (2) usb -1 C 1153 2236d 2236d 0/29 closed as invalid on 2019/09/04 14:27
upstream WARNING in kcov_remote_start (5) wireless -1 4243 361d 460d 28/29 fixed on 2024/10/22 14:56
upstream WARNING in kcov_remote_start (3) usb -1 265513 499d 568d 25/29 fixed on 2024/06/05 13:52
upstream WARNING in kcov_remote_start usb -1 C 655 2236d 2236d 0/29 closed as invalid on 2019/09/03 16:37
upstream WARNING in kcov_remote_start (6) wireless -1 1026 3h28m 347d 0/29 upstream: reported on 2024/11/04 21:25

Sample crash report:
------------[ cut here ]------------
WARNING: CPU: 1 PID: 14108 at kernel/kcov.c:869 kcov_remote_start+0x42c/0x5b8 kernel/kcov.c:-1
Modules linked in:
CPU: 1 PID: 14108 Comm: syz.3.3086 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/30/2025
pstate: 424000c5 (nZcv daIF +PAN -UAO +TCO -DIT -SSBS BTYPE=--)
pc : kcov_remote_start+0x42c/0x5b8 kernel/kcov.c:-1
lr : kcov_remote_start+0xe0/0x5b8 kernel/kcov.c:862
sp : ffff800021ed6350
x29: ffff800021ed6350 x28: ffff0000f5017218 x27: ffff7000043dac8c
x26: ffff0000eba28ea0 x25: 1fffe0001ea02e43 x24: 0000000000ff0100
x23: ffff8000150c1140 x22: 0000000000000000 x21: ffff8000150194b0
x20: 0000000000000000 x19: ffff0000d44d1bc0 x18: ffff800011abbcc0
x17: ffff8000181f8000 x16: ffff800008042c8c x15: ffff800017cd8fc0
x14: ffff0000d44d2658 x13: ffff0000d44d26d0 x12: 0000000000080000
x11: 000000000000ce4e x10: 0000000000000003 x9 : 0000000000000200
x8 : 0000000000000002 x7 : 0000000000000000 x6 : 0000000000000000
x5 : ffff80001852b548 x4 : 0000000000000008 x3 : ffff8000082d12b0
x2 : 0000000000000001 x1 : ffff800011abe900 x0 : 0000000000000001
Call trace:
 kcov_remote_start+0x42c/0x5b8 kernel/kcov.c:-1
 kcov_remote_start_common include/linux/kcov.h:50 [inline]
 ieee80211_rx_list+0x424/0x234c net/mac80211/rx.c:5272
 ieee80211_rx_napi+0x164/0x338 net/mac80211/rx.c:5313
 ieee80211_rx include/net/mac80211.h:4846 [inline]
 ieee80211_handle_queued_frames+0xe8/0x188 net/mac80211/main.c:317
 ieee80211_stop_device+0x24/0x88 net/mac80211/util.c:2211
 ieee80211_do_stop+0x1284/0x1924 net/mac80211/iface.c:742
 ieee80211_stop+0x3a8/0x410 net/mac80211/iface.c:801
 __dev_close_many+0x2a4/0x394 net/core/dev.c:1572
 __dev_close net/core/dev.c:1584 [inline]
 __dev_change_flags+0x3e8/0x54c net/core/dev.c:8636
 dev_change_flags+0x80/0x154 net/core/dev.c:8709
 do_setlink+0xa24/0x32c4 net/core/rtnetlink.c:2833
 __rtnl_newlink net/core/rtnetlink.c:3608 [inline]
 rtnl_newlink+0x12d0/0x1a1c net/core/rtnetlink.c:3655
 rtnetlink_rcv_msg+0x734/0xce4 net/core/rtnetlink.c:6153
 netlink_rcv_skb+0x208/0x3c4 net/netlink/af_netlink.c:2511
 rtnetlink_rcv+0x28/0x38 net/core/rtnetlink.c:6171
 netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
 netlink_unicast+0x60c/0x824 net/netlink/af_netlink.c:1344
 netlink_sendmsg+0x6e8/0x9b0 net/netlink/af_netlink.c:1872
 sock_sendmsg_nosec net/socket.c:718 [inline]
 __sock_sendmsg net/socket.c:730 [inline]
 ____sys_sendmsg+0x5b8/0x918 net/socket.c:2519
 ___sys_sendmsg net/socket.c:2573 [inline]
 __sys_sendmsg+0x25c/0x320 net/socket.c:2602
 __do_sys_sendmsg net/socket.c:2611 [inline]
 __se_sys_sendmsg net/socket.c:2609 [inline]
 __arm64_sys_sendmsg+0x80/0x94 net/socket.c:2609
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall+0x98/0x2bc arch/arm64/kernel/syscall.c:52
 el0_svc_common+0x138/0x258 arch/arm64/kernel/syscall.c:140
 do_el0_svc+0x58/0x13c arch/arm64/kernel/syscall.c:204
 el0_svc+0x58/0x138 arch/arm64/kernel/entry-common.c:637
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:585
irq event stamp: 4001
hardirqs last  enabled at (4000): [<ffff800011a45e3c>] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline]
hardirqs last  enabled at (4000): [<ffff800011a45e3c>] _raw_spin_unlock_irqrestore+0x48/0xac kernel/locking/spinlock.c:194
hardirqs last disabled at (4001): [<ffff8000084a2238>] kcov_remote_start+0xbc/0x5b8 kernel/kcov.c:862
softirqs last  enabled at (3976): [<ffff8000081a967c>] softirq_handle_end kernel/softirq.c:439 [inline]
softirqs last  enabled at (3976): [<ffff8000081a967c>] handle_softirqs+0xaf8/0xc6c kernel/softirq.c:624
softirqs last disabled at (3998): [<ffff800011275dac>] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19
---[ end trace 0000000000000000 ]---

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/10/10 10:09 linux-6.1.y 882efbdd9d34 ff1712fe .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in kcov_remote_start
2025/07/13 12:19 linux-6.1.y dfc486ec9cce 3cda49cf .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in kcov_remote_start
2025/06/28 15:33 linux-6.1.y 7e69c33e4858 fc9d8ee5 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan-arm64 WARNING in kcov_remote_start
* Struck through repros no longer work on HEAD.