INFO: task hung in fuse_simple_request (2)

Status: auto-obsoleted due to no activity on 2025/01/28 01:40
Reported-by: syzbot+d3dc6bb0d428fdb76862@syzkaller.appspotmail.com
First crash: 778d, last: 660d
▶ ▼ Similar bugs (10)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.6 INFO: task hung in fuse_simple_request (2) origin:upstream 1 syz 10 4d05h 289d 0/2 upstream: reported syz repro on 2025/10/25 20:31
linux-5.15 INFO: task hung in fuse_simple_request (4) 1 2 249d 289d 0/3 auto-obsoleted due to no activity on 2026/03/15 05:05
linux-5.15 INFO: task hung in fuse_simple_request 1 12 1019d 1117d 0/3 auto-obsoleted due to no activity on 2024/02/03 13:59
linux-6.6 INFO: task hung in fuse_simple_request 1 1 391d 391d 0/2 auto-obsoleted due to no activity on 2025/10/23 13:22
upstream INFO: task hung in fuse_simple_request fuse 1 syz, C inconclusive error 273 686d 2066d 0/29 upstream: reported C repro on 2020/12/13 21:13
linux-5.15 INFO: task hung in fuse_simple_request (5) 1 1 1d21h 1d21h 0/3 upstream: reported on 2026/08/09 12:03
linux-6.1 INFO: task hung in fuse_simple_request 1 6 996d 1085d 0/3 auto-obsoleted due to no activity on 2024/02/26 14:29
linux-5.15 INFO: task hung in fuse_simple_request (3) 1 9 414d 528d 0/3 auto-obsoleted due to no activity on 2025/09/30 15:49
linux-6.1 INFO: task hung in fuse_simple_request (2) origin:upstream 1 syz error 27 181d 780d 0/3 upstream: reported syz repro on 2024/06/21 20:45
upstream INFO: task can't die in request_wait_answer fuse 1 syz, C error 14 1637d 2147d 0/29 auto-obsoleted due to no activity on 2023/04/16 22:02

Sample crash report:
INFO: task syz.3.2576:12065 blocked for more than 145 seconds.
      Not tainted 5.15.168-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.2576      state:D stack:25560 pid:12065 ppid:  3584 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5027 [inline]
 __schedule+0x12c4/0x45b0 kernel/sched/core.c:6373
 schedule+0x11b/0x1f0 kernel/sched/core.c:6456
 request_wait_answer fs/fuse/dev.c:411 [inline]
 __fuse_request_send fs/fuse/dev.c:430 [inline]
 fuse_simple_request+0x112f/0x1a00 fs/fuse/dev.c:515

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/10/20 01:39 linux-5.15.y 584a40a22cb9 cd6fc0a3 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: task hung in fuse_simple_request
2024/08/14 05:46 linux-5.15.y 7e89efd3ae1c bde81f6f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: task hung in fuse_simple_request
2024/06/24 00:58 linux-5.15.y 4878aadf2d15 edc5149a .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: task hung in fuse_simple_request
* Struck through repros no longer work on HEAD.