INFO: task hung in nsim_drv_remove

Status: upstream: reported C repro on 2026/01/25 11:38
Bug presence: origin:upstream
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+729ec771091615685175@syzkaller.appspotmail.com
First crash: 206d, last: 206d
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (3)
Date Name Commit Repro Result
2026/05/11 linux-6.6.y (ToT) 3b9f64db0496 C [report] INFO: task hung in corrupted
2026/01/25 upstream (ToT) 63804fed149a C [report] INFO: task hung in corrupted
2026/05/11 upstream (ToT) 5d6919055dec C Didn't crash
▶ ▼ Similar bugs (3)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in nsim_drv_remove (2) net 1 2 744d 802d 0/29 auto-obsoleted due to no activity on 2024/11/03 12:36
upstream INFO: task hung in nsim_drv_remove net 1 1 1037d 1037d 0/29 auto-obsoleted due to no activity on 2024/01/15 19:32
upstream INFO: task hung in nsim_drv_remove (3) net 1 1 230d 230d 0/29 auto-obsoleted due to no activity on 2026/04/01 18:46
▶ ▼ Fix bisection attempts (2)
Created Duration User Patch Repo Result
2026/05/16 17:12 15m fix candidate upstream error job log
2026/02/24 12:32 1m bisect fix linux-6.6.y error job log

Sample crash report:
INFO: task syz-executor:5906 blocked for more than 144 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:22248 pid:5906  ppid:1      flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0x1553/0x45a0 kernel/sched/core.c:6700
 schedule+0xbd/0x170 kernel/sched/core.c:6774
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6833
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x6a9/0xcc0 kernel/locking/mutex.c:747
 nsim_drv_remove+0x50/0x160 drivers/net/netdevsim/dev.c:1675
 device_remove drivers/base/dd.c:567 [inline]
 __device_release_driver drivers/base/dd.c:1272 [inline]
 device_release_driver_internal+0x468/0x7a0 drivers/base/dd.c:1295
 bus_remove_device+0x342/0x400 drivers/base/bus.c:576
 device_del+0x522/0x910 drivers/base/core.c:3872

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/01/25 11:37 linux-6.6.y cbb31f77b879 40acda8a .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: task hung in nsim_drv_remove
* Struck through repros no longer work on HEAD.