INFO: task hung in ipv6_sock_mc_close

Status: auto-obsoleted due to no activity on 2024/09/11 11:28
Reported-by: syzbot+9c466643cca32cbf6072@syzkaller.appspotmail.com
First crash: 804d, last: 804d
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in ipv6_sock_mc_close (2) net 1 1 658d 658d 0/29 auto-obsoleted due to no activity on 2025/01/25 10:26
upstream INFO: task hung in ipv6_sock_mc_close net 1 2 791d 813d 0/29 auto-obsoleted due to no activity on 2024/09/14 02:16

Sample crash report:
INFO: task syz-executor.2:5763 blocked for more than 143 seconds.
      Not tainted 6.1.92-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2  state:D stack:25000 pid:5763  ppid:4369   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x142d/0x4550 kernel/sched/core.c:6558
 schedule+0xbf/0x180 kernel/sched/core.c:6634
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x6b9/0xd80 kernel/locking/mutex.c:747
 ipv6_sock_mc_close+0xc5/0x130 net/ipv6/mcast.c:354
 inet6_release+0x43/0x70 net/ipv6/af_inet6.c:488
 __sock_release net/socket.c:654 [inline]
 sock_close+0xcd/0x230 net/socket.c:1400
 __fput+0x3b7/0x890 fs/file_table.c:320
 task_work_run+0x246/0x300 kernel/task_work.c:179
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0xde/0x100 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x60/0x270 kernel/entry/common.c:303
 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:87
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f0dbcc7bdda
RSP: 002b:00007ffc52816330 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 000000000000000b RCX: 00007f0dbcc7bdda
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000000000000a
RBP: 00007f0dbcdb59a0 R08: 00000000818e5adc R09: 0000000000000010
R10: 0000000000000033 R11: 0000000000000293 R12: 0000000000027f52
R13: 00007f0dbcdb42ec R14: 0000000000000032 R15: 00007f0dbcdb59a0
 </TASK>
INFO: task syz-executor.1:5782 blocked for more than 143 seconds.
      Not tainted 6.1.92-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:25832 pid:5782  ppid:4181   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5245 [inline]
 __schedule+0x142d/0x4550 kernel/sched/core.c:6558
 schedule+0xbf/0x180 kernel/sched/core.c:6634
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6693

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/06/03 11:27 linux-6.1.y 88690811da69 0aba2352 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-6-1-kasan INFO: task hung in ipv6_sock_mc_close
* Struck through repros no longer work on HEAD.