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INFO: task hung in do_exit

Status: premoderation: reported on 2025/07/22 11:48
Reported-by: syzbot+98e4b88025275da51558@syzkaller.appspotmail.com
First crash: 35d, last: 35d
▶ ▼ Similar bugs (7)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in do_exit 1 syz done error 125 1305d 2327d 0/29 closed as invalid on 2022/02/08 10:54
linux-4.14 INFO: task hung in do_exit 1 syz inconclusive 8 1301d 2316d 0/1 upstream: reported syz repro on 2019/04/25 02:28
android-414 INFO: task hung in do_exit 1 syz 19 2095d 2328d 0/1 public: reported syz repro on 2019/04/13 00:01
linux-4.19 INFO: task hung in do_exit 1 C error 58 933d 2321d 0/1 upstream: reported C repro on 2019/04/19 20:32
upstream INFO: task can't die in show_free_areas serial 1 C error 215 4d01h 1310d 0/29 upstream: reported C repro on 2022/01/24 13:23
linux-6.1 INFO: task hung in do_exit 1 1 411d 411d 0/3 auto-obsoleted due to no activity on 2024/10/20 05:24
android-49 INFO: task hung in do_exit 1 syz 18 2142d 2326d 0/3 public: reported syz repro on 2019/04/14 09:28

Sample crash report:
INFO: task syz.3.21145:32433 blocked for more than 125 seconds.
      Not tainted 6.12.30-syzkaller-g2199f5c4b596 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.21145     state:D stack:0     pid:32433 tgid:32433 ppid:27941  flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5945 [inline]
 __schedule+0x132b/0x1e00 kernel/sched/core.c:7789
 __schedule_loop kernel/sched/core.c:7870 [inline]
 schedule+0xc6/0x240 kernel/sched/core.c:7885
 schedule_preempt_disabled+0x14/0x30 kernel/sched/core.c:7942
 rwsem_down_read_slowpath+0x70d/0x1240 kernel/locking/rwsem.c:1126
 __down_read_common kernel/locking/rwsem.c:1307 [inline]
 __down_read kernel/locking/rwsem.c:1320 [inline]
 down_read+0x8f/0xe0 kernel/locking/rwsem.c:1597
 mmap_read_lock include/linux/mmap_lock.h:184 [inline]
 exit_mm kernel/exit.c:549 [inline]
 do_exit+0x838/0x2630 kernel/exit.c:931
 do_group_exit+0x22a/0x300 kernel/exit.c:1094
 get_signal+0x139d/0x14f0 kernel/signal.c:2934
 arch_do_signal_or_restart+0x96/0x720 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x58/0xb0 kernel/entry/common.c:218
 do_syscall_64+0x64/0xf0 arch/x86/entry/common.c:89
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f16025c3209
RSP: 002b:00007ffc4c49e8f8 EFLAGS: 00000206 ORIG_RAX: 00000000000001b3
RAX: fffffffffffffffc RBX: 00007f1602545600 RCX: 00007f16025c3209
RDX: 00007f1602545600 RSI: 0000000000000058 RDI: 00007ffc4c49e940
RBP: 00007f16033a26c0 R08: 00007f16033a26c0 R09: 00007ffc4c49ea27
R10: 0000000000000008 R11: 0000000000000206 R12: ffffffffffffffa8
R13: 000000000000006e R14: 00007ffc4c49e940 R15: 00007ffc4c49ea28
 </TASK>
INFO: task syz.3.21145:32434 blocked for more than 130 seconds.
      Not tainted 6.12.30-syzkaller-g2199f5c4b596 #0

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2025/07/22 11:48 android16-6.12 2199f5c4b596 1555463b .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-6-12-rust INFO: task hung in do_exit
* Struck through repros no longer work on HEAD.