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INFO: task hung in reg_todo (4)

Status: upstream: reported C repro on 2025/12/26 20:18
Subsystems: wireless
[Documentation on labels]
Reported-by: syzbot+8f72a490f8e8879ee7e6@syzkaller.appspotmail.com
First crash: 259d, last: 8d18h
▶ ▼ ✨ AI Jobs (1)
ID Workflow Result Correct Bug Created Started Finished Revision Error
6e0532b2-c4ef-4051-be7a-c7fd14e4805f assessment-security 💥 INFO: task hung in reg_todo (4) 2026/05/14 11:52 2026/05/14 11:52 2026/05/14 11:53 6ccb967e465e832a7bfd7a116ad00d52a0923a5d failed to run ["git" "pull" "origin" "HEAD" "--depth=1" "--allow-unrelated-histories"]: exit status 128 From /app/workdir/repo/linux * branch HEAD -> FETCH_HEAD Updating files: 22% (21056/92193) Updating files: 23% (21205/92193) Updating files: 24% (22127/92193) Updating files: 25% (23049/92193) Updating files: 26% (23971/92193) Updating files: 27% (24893/92193) Updating files: 28% (25815/92193) Updating files: 29% (26736/92193) Updating files: 30% (27658/92193) Updating files: 31% (28580/92193) Updating files: 32% (29502/92193) Updating files: 32% (29798/92193) Updating files: 33% (30424/92193) Updating files: 34% (31346/92193) Updating files: 35% (32268/92193) Updating files: 36% (33190/92193) error: unable to write file drivers/crypto/xilinx/Makefile error: unable to write file drivers/crypto/xilinx/xilinx-trng.c error: unable to write file drivers/crypto/xilinx/zynqmp-aes-gcm.c error: unable to write file drivers/crypto/xilinx/zynqmp-sha.c fatal: cannot create directory at 'drivers/cxl': No space left on device
Cause bisection: failed (error log, bisect log)
  
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
[syzbot] [wireless?] INFO: task hung in reg_todo (4) 0 (1) 2025/12/26 20:18
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in reg_todo (3) wireless 1 1 392d 392d 0/29 auto-obsoleted due to no activity on 2025/07/20 20:01
upstream INFO: task hung in reg_todo (2) wireless 1 syz 3 440d 440d 0/29 closed as invalid on 2025/04/14 03:52
▶ ▼ Last patch testing requests (4)
Created Duration User Patch Repo Result
2026/04/19 13:18 47m retest repro net-next report log
2026/04/01 23:33 38m retest repro upstream report log
2026/01/05 20:40 40m retest repro upstream report log
2026/01/05 20:38 18m retest repro upstream error

Sample crash report:
INFO: task kworker/0:0:9 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/0:0     state:D stack:23672 pid:9     tgid:9     ppid:2      task_flags:0x4208060 flags:0x00080000
Workqueue: events reg_todo
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5256 [inline]
 __schedule+0x149b/0x4fd0 kernel/sched/core.c:6863
 __schedule_loop kernel/sched/core.c:6945 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:6960
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7017
 __mutex_lock_common kernel/locking/mutex.c:692 [inline]
 __mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:776
 reg_todo+0x1c/0xa60 net/wireless/reg.c:3189

Crashes (6):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/12/22 20:04 upstream 9448598b22c5 d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in reg_todo
2026/04/05 01:51 net-next 3741f8fa004b 4440e7c2 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in reg_todo
2025/10/09 10:29 upstream ec714e371f22 7e2882b3 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto INFO: task hung in reg_todo
2025/09/01 03:17 upstream 5c3b3264e585 807a3b61 .config console log report info [disk image] [vmlinux] [kernel image] ci-qemu-gce-upstream-auto INFO: task hung in reg_todo
2026/05/10 07:28 linux-next e98d21c170b0 29233ece .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in reg_todo
2026/04/29 17:41 linux-next 0787c45ea08a 804ea88f .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in reg_todo
* Struck through repros no longer work on HEAD.