syzbot

 sign-in | mailing list | source | docs
🐞 Open [1488]
≡ Subsystems
🐞 Fixed [6543]
🐞 Invalid [16722]
⬇ Missing Backports [202]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
Total Repo Heatmap Subsystems Heatmap
💬 Send us feedback

INFO: task hung in ppp_exit_net (3)

Status: auto-obsoleted due to no activity on 2023/11/13 21:08
Subsystems: ppp
[Documentation on labels]
First crash: 750d, last: 750d
▶ ▼ Similar bugs (5)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-5.15 INFO: task hung in ppp_exit_net 1 1 464d 464d 0/3 auto-obsoleted due to no activity on 2024/09/04 17:46
upstream INFO: task hung in ppp_exit_net (2) ppp 1 1 912d 912d 0/29 auto-obsoleted due to no activity on 2023/06/04 05:29
upstream INFO: task hung in ppp_exit_net (4) ppp 1 131 105d 447d 0/29 auto-obsoleted due to no activity on 2025/07/30 09:57
upstream INFO: task hung in ppp_exit_net ppp 1 1 1162d 1162d 0/29 auto-closed as invalid on 2022/09/27 15:01
linux-6.1 INFO: task hung in ppp_exit_net 1 1 469d 469d 0/3 auto-obsoleted due to no activity on 2024/08/30 06:26

Sample crash report:
INFO: task kworker/u4:5:1025 blocked for more than 143 seconds.
      Not tainted 6.5.0-rc5-syzkaller-01526-g479b322ee6fe #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:5    state:D stack:26336 pid:1025  ppid:2      flags:0x00004000
Workqueue: netns cleanup_net
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0xee1/0x59f0 kernel/sched/core.c:6710
 schedule+0xe7/0x1b0 kernel/sched/core.c:6786
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6845
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x967/0x1340 kernel/locking/mutex.c:747
 ppp_exit_net+0xaf/0x370 drivers/net/ppp/ppp_generic.c:1129
 ops_exit_list+0xb0/0x170 net/core/net_namespace.c:170
 cleanup_net+0x505/0xb20 net/core/net_namespace.c:614
 process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2600
 worker_thread+0x687/0x1110 kernel/workqueue.c:2751
 kthread+0x33a/0x430 kernel/kthread.c:389
 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>
INFO: task syz-executor.4:5687 blocked for more than 146 seconds.
      Not tainted 6.5.0-rc5-syzkaller-01526-g479b322ee6fe #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D stack:28704 pid:5687  ppid:5072   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0xee1/0x59f0 kernel/sched/core.c:6710
 schedule+0xe7/0x1b0 kernel/sched/core.c:6786
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6845
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x967/0x1340 kernel/locking/mutex.c:747
 wiphy_lock include/net/cfg80211.h:5776 [inline]
 cfg80211_wext_siwessid+0x7f/0x140 net/wireless/wext-compat.c:1511
 ioctl_standard_iw_point+0x599/0xc00 net/wireless/wext-core.c:864
 ioctl_standard_call+0x18e/0x210 net/wireless/wext-core.c:1049
 wireless_process_ioctl+0x4ce/0x5d0 net/wireless/wext-core.c:980
 wext_ioctl_dispatch net/wireless/wext-core.c:1013 [inline]
 wext_ioctl_dispatch net/wireless/wext-core.c:1001 [inline]
 wext_handle_ioctl+0x239/0x2b0 net/wireless/wext-core.c:1074
 sock_ioctl+0x3a4/0x6c0 net/socket.c:1253
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f73f3a7cae9
RSP: 002b:00007f73f478e0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f73f3b9c050 RCX: 00007f73f3a7cae9
RDX: 0000000020000000 RSI: 0000000000008b1a RDI: 0000000000000006
RBP: 00007f73f3ac847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f73f3b9c050 R15: 00007fff88b2acd8
 </TASK>
INFO: task syz-executor.0:5702 blocked for more than 149 seconds.
      Not tainted 6.5.0-rc5-syzkaller-01526-g479b322ee6fe #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:27968 pid:5702  ppid:5066   flags:0x00000006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5381 [inline]
 __schedule+0xee1/0x59f0 kernel/sched/core.c:6710
 schedule+0xe7/0x1b0 kernel/sched/core.c:6786
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6845
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x967/0x1340 kernel/locking/mutex.c:747
 rtnl_lock net/core/rtnetlink.c:78 [inline]
 rtnetlink_rcv_msg+0x3e2/0xd30 net/core/rtnetlink.c:6424
 netlink_rcv_skb+0x16b/0x440 net/netlink/af_netlink.c:2545
 netlink_unicast_kernel net/netlink/af_netlink.c:1342 [inline]
 netlink_unicast+0x536/0x810 net/netlink/af_netlink.c:1368
 netlink_sendmsg+0x93c/0xe40 net/netlink/af_netlink.c:1910
 sock_sendmsg_nosec net/socket.c:728 [inline]
 sock_sendmsg+0xd9/0x180 net/socket.c:751
 ____sys_sendmsg+0x6ac/0x940 net/socket.c:2514
 ___sys_sendmsg+0x135/0x1d0 net/socket.c:2568
 __sys_sendmsg+0x117/0x1e0 net/socket.c:2597
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x38/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f064e47cae9
RSP: 002b:00007f064f1360c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f064e59bf80 RCX: 00007f064e47cae9
RDX: 0000000000000000 RSI: 0000000020000040 RDI: 0000000000000009
RBP: 00007f064e4c847a R08: 0000000000000000 R09: 0000000000000000

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/08/15 20:59 net-next 479b322ee6fe 39990d51 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-net-kasan-gce INFO: task hung in ppp_exit_net
* Struck through repros no longer work on HEAD.