syzbot


INFO: task hung in vlan_ioctl_handler (2)

Status: upstream: reported on 2024/05/25 22:51
Reported-by: syzbot+dc2f184f3d49e65aa049@syzkaller.appspotmail.com
First crash: 20d, last: 18d
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task can't die in vlan_ioctl_handler net 107 10h24m 747d 0/27 upstream: reported on 2022/05/30 07:14
linux-6.1 INFO: task hung in vlan_ioctl_handler 3 22d 142d 0/3 upstream: reported on 2024/01/25 03:05
linux-5.15 INFO: task hung in vlan_ioctl_handler 2 248d 288d 0/3 auto-obsoleted due to no activity on 2024/01/18 16:24

Sample crash report:
INFO: task syz-executor.2:22003 blocked for more than 143 seconds.
      Not tainted 5.15.160-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2  state:D stack:24024 pid:22003 ppid: 19325 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0x12c4/0x45b0 kernel/sched/core.c:6376
 schedule+0x11b/0x1f0 kernel/sched/core.c:6459
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6518
 __mutex_lock_common+0xe34/0x25a0 kernel/locking/mutex.c:669
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
 vlan_ioctl_handler+0x114/0x9a0 net/8021q/vlan.c:554
 sock_ioctl+0x53c/0x770 net/socket.c:1221
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f7a12832ee9
RSP: 002b:00007f7a10da60c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f7a12961f80 RCX: 00007f7a12832ee9

Crashes (3):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2024/05/27 13:33 linux-5.15.y c61bd26ae81a 761766e6 .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: task hung in vlan_ioctl_handler
2024/05/26 12:31 linux-5.15.y c61bd26ae81a a10a183e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: task hung in vlan_ioctl_handler
2024/05/25 22:51 linux-5.15.y c61bd26ae81a a10a183e .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: task hung in vlan_ioctl_handler
* Struck through repros no longer work on HEAD.