BUG: using smp_processor_id() in preemptible code in ieee80211_tx_control_port

Status: upstream: reported C repro on 2026/09/09 22:44
Subsystems: wireless
Labels: prio:normal
[Documentation on labels]
Reported-by: syzbot+d979bd35c8a76fd1b6f5@syzkaller.appspotmail.com
First crash: 1d08h, last: 12h02m
Cause bisection: failed (error log, bisect log)
  
✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision
2baf6232 assessment-security DenialOfService: ✅ Exploitable: ❌ FilesystemTrigger: ❌ NetworkTrigger: ❌ PeripheralTrigger: ❌ RemoteTrigger: ❌ Unprivileged: ❌ UserNamespace: ✅ VMGuestTrigger: ❌ VMHostTrigger: ❌ BUG: using smp_processor_id() in preemptible code in ieee80211_tx_control_port 2026/09/10 00:42 2026/09/10 00:42 2026/09/10 01:18 b31349d1
Discussions (2)
Title Replies (including bot) Last reply
[PATCH] mac80211: fix using smp_processor_id() in preemptible code in ieee80211_tx_control_port() 1 (1) 2026/09/10 04:10
[syzbot] [wireless?] BUG: using smp_processor_id() in preemptible code in ieee80211_tx_control_port 0 (2) 2026/09/10 04:07
Last patch testing requests (1)
Created Duration User Patch Repo Result
2026/09/10 04:07 35m kartikey406@gmail.com patch linux-next error job log

Sample crash report:
BUG: using smp_processor_id() in preemptible [00000000] code: syz-executor240/5639
caller is dev_sw_netstats_tx_add include/linux/netdevice.h:3086 [inline]
caller is ieee80211_tx_control_port+0xac7/0x1100 net/mac80211/tx.c:6656
CPU: 0 UID: 0 PID: 5639 Comm: syz-executor240 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 check_preemption_disabled+0xcd/0xd0 lib/smp_processor_id.c:47
 dev_sw_netstats_tx_add include/linux/netdevice.h:3086 [inline]
 ieee80211_tx_control_port+0xac7/0x1100 net/mac80211/tx.c:6656
 rdev_tx_control_port net/wireless/rdev-ops.h:783 [inline]
 nl80211_tx_control_port+0x624/0x960 net/wireless/nl80211.c:18603
 genl_family_rcv_msg_doit+0x233/0x340 net/netlink/genetlink.c:1114
 genl_family_rcv_msg net/netlink/genetlink.c:1194 [inline]
 genl_rcv_msg+0x614/0x7a0 net/netlink/genetlink.c:1209
 netlink_rcv_skb+0x226/0x4a0 net/netlink/af_netlink.c:2556
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1218
 netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
 netlink_unicast+0x7bd/0x940 net/netlink/af_netlink.c:1345
 netlink_sendmsg+0x7c3/0xae0 net/netlink/af_netlink.c:1900
 sock_sendmsg_nosec+0x13a/0x180 net/socket.c:800
 __sock_sendmsg net/socket.c:815 [inline]
 ____sys_sendmsg+0x54e/0x850 net/socket.c:2713
 ___sys_sendmsg+0x2a5/0x360 net/socket.c:2767
 __sys_sendmsg net/socket.c:2799 [inline]
 __do_sys_sendmsg net/socket.c:2804 [inline]
 __se_sys_sendmsg net/socket.c:2802 [inline]
 __x64_sys_sendmsg+0x1b1/0x290 net/socket.c:2802
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2fe280ba69
Code: c0 79 93 eb d5 48 8d 7c 1d 00 eb 99 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 d0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc9ac26a08 EFLAGS: 00000246 ORIG_RAX: 000000000000002e


Crashes (18):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/09 15:37 linux-next a9d7ced84989 8387c273 .config strace log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: using smp_processor_id() in preemptible code in ieee80211_tx_control_port
2026/09/09 19:51 linux-next a9d7ced84989 4e8b1cc6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: using smp_processor_id() in preemptible code in ieee80211_tx_control_port
2026/09/09 19:48 linux-next a9d7ced84989 4e8b1cc6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: using smp_processor_id() in preemptible code in ieee80211_tx_control_port
2026/09/09 19:45 linux-next a9d7ced84989 4e8b1cc6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: using smp_processor_id() in preemptible code in ieee80211_tx_control_port
2026/09/09 19:45 linux-next a9d7ced84989 4e8b1cc6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: using smp_processor_id() in preemptible code in ieee80211_tx_control_port
2026/09/09 06:50 linux-next a9d7ced84989 8387c273 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: using smp_processor_id() in preemptible code in ieee80211_tx_control_port
2026/09/09 06:09 linux-next a9d7ced84989 8387c273 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: using smp_processor_id() in preemptible code in ieee80211_tx_control_port
2026/09/09 05:26 linux-next a9d7ced84989 8387c273 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: using smp_processor_id() in preemptible code in ieee80211_tx_control_port
2026/09/09 03:07 linux-next a9d7ced84989 8387c273 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: using smp_processor_id() in preemptible code in ieee80211_tx_control_port
2026/09/09 03:06 linux-next a9d7ced84989 8387c273 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: using smp_processor_id() in preemptible code in ieee80211_tx_control_port
2026/09/09 02:11 linux-next a9d7ced84989 8387c273 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: using smp_processor_id() in preemptible code in ieee80211_tx_control_port
2026/09/09 02:11 linux-next a9d7ced84989 8387c273 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: using smp_processor_id() in preemptible code in ieee80211_tx_control_port
2026/09/08 23:20 linux-next a9d7ced84989 243b72f1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: using smp_processor_id() in preemptible code in ieee80211_tx_control_port
2026/09/08 23:20 linux-next a9d7ced84989 243b72f1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: using smp_processor_id() in preemptible code in ieee80211_tx_control_port
2026/09/08 23:19 linux-next a9d7ced84989 243b72f1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: using smp_processor_id() in preemptible code in ieee80211_tx_control_port
2026/09/08 23:19 linux-next a9d7ced84989 243b72f1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: using smp_processor_id() in preemptible code in ieee80211_tx_control_port
2026/09/08 23:14 linux-next a9d7ced84989 243b72f1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: using smp_processor_id() in preemptible code in ieee80211_tx_control_port
2026/09/08 23:14 linux-next a9d7ced84989 243b72f1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root BUG: using smp_processor_id() in preemptible code in ieee80211_tx_control_port
* Struck through repros no longer work on HEAD.