INFO: task hung in del_device_store

Status: upstream: reported C repro on 2025/11/21 00:14
Bug presence: origin:upstream
Labels: missing-backport
[Documentation on labels]
Reported-by: syzbot+9e1ed60c6f288bc7b286@syzkaller.appspotmail.com
First crash: 302d, last: 5d16h
Fix bisection: failed (error log, bisect log)
  
▶ ▼ Bug presence (3)
Date Name Commit Repro Result
2026/05/18 linux-6.6.y (ToT) eac8889a3a1c C [report] INFO: task hung in corrupted
2025/11/25 upstream (ToT) 30f09200cc4a C [report] INFO: task hung in corrupted
2026/05/18 upstream (ToT) 4d3a2a466b8d C Didn't crash
▶ ▼ Similar bugs (5)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 INFO: task hung in del_device_store (2) origin:upstream 1 syz error 11 1d08h 257d 0/3 upstream: reported syz repro on 2026/01/05 21:06
linux-5.15 INFO: task hung in del_device_store 1 42 428d 800d 0/3 auto-obsoleted due to no activity on 2025/10/26 20:35
linux-5.15 INFO: task hung in del_device_store (2) 1 15 10h01m 303d 0/3 upstream: reported on 2025/11/20 15:49
linux-6.1 INFO: task hung in del_device_store 1 31 395d 806d 0/3 auto-obsoleted due to no activity on 2025/11/28 01:25
upstream INFO: task hung in del_device_store prio:low net 1 syz, C error 2308 15m 1294d 0/29 upstream: reported C repro on 2023/03/05 17:44
▶ ▼ Fix bisection attempts (2)
Created Duration User Patch Repo Result
2026/02/13 21:03 6m bisect fix linux-6.6.y error job log
2025/12/25 17:29 2h16m bisect fix linux-6.6.y OK (0) job log log

Sample crash report:
INFO: task syz-executor:5922 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:22344 pid:5922  ppid:1      flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x15ae/0x4660 kernel/sched/core.c:6701
 schedule+0xbd/0x170 kernel/sched/core.c:6775
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6834
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x673/0xc80 kernel/locking/mutex.c:747
 del_device_store+0xd7/0x370 drivers/net/netdevsim/bus.c:209

Crashes (7):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/09/14 05:46 linux-6.6.y 8b73de7da85f 70a60e12 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in del_device_store
2026/06/21 20:38 linux-6.6.y d1cfde2d5d15 43bfcdb0 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: task hung in del_device_store
2026/04/26 16:58 linux-6.6.y 9760bf04666d 9c2d0995 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: task hung in del_device_store
2026/01/14 20:26 linux-6.6.y c596736dadab d6526ea3 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in del_device_store
2025/11/21 16:29 linux-6.6.y 0a805b6ea8cd 280ea308 .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: task hung in del_device_store
2025/11/21 00:13 linux-6.6.y 0a805b6ea8cd 2cc4c24a .config console log report syz / log C [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan-perf INFO: task hung in del_device_store
2026/05/27 21:22 linux-6.6.y 0a40c6fbd105 8777bdc3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-6-kasan INFO: task hung in del_device_store
* Struck through repros no longer work on HEAD.