INFO: task hung in _vm_unmap_aliases (2)

Status: upstream: reported on 2026/11/05 23:48
Reported-by: syzbot+de86b2f894e6d3670d5d@syzkaller.appspotmail.com
First crash: 5d01h, last: 5d01h
▶ ▼ Similar bugs (4)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream INFO: task hung in _vm_unmap_aliases kernel 1 1 2274d 2274d 0/29 auto-closed as invalid on 2020/11/17 05:59
linux-5.15 INFO: task hung in _vm_unmap_aliases 1 1 725d 725d 0/3 auto-obsoleted due to no activity on 2025/02/23 10:14
upstream INFO: task hung in _vm_unmap_aliases (3) prio:low mm 1 syz, C 746 22h19m 1036d 0/29 upstream: reported C repro on 2024/01/09 18:18
upstream INFO: task hung in _vm_unmap_aliases (2) modules 1 1 1424d 1424d 0/29 auto-obsoleted due to no activity on 2023/04/08 08:01

Sample crash report:
INFO: task dhcpcd:6621 blocked for more than 150 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:dhcpcd          state:D stack:27072 pid: 6621 ppid:  3855 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11c3/0x4350 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6537
 __mutex_lock_common+0xdf5/0x2400 kernel/locking/mutex.c:669
 __mutex_lock kernel/locking/mutex.c:729 [inline]
 mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743
 _vm_unmap_aliases+0x3fb/0x4a0 mm/vmalloc.c:2145
 change_page_attr_set_clr+0x317/0xc30 arch/x86/mm/pat/set_memory.c:1740
 change_page_attr_clear arch/x86/mm/pat/set_memory.c:1797 [inline]
 set_memory_ro+0x89/0xd0 arch/x86/mm/pat/set_memory.c:1943
 bpf_jit_binary_lock_ro include/linux/filter.h:919 [inline]
 bpf_int_jit_compile+0xbf27/0xc4d0 arch/x86/net/bpf_jit_comp.c:2478
 bpf_prog_select_runtime+0x46f/0x7b0 kernel/bpf/core.c:1982
 bpf_migrate_filter net/core/filter.c:1307 [inline]
 bpf_prepare_filter+0x100e/0x11b0 net/core/filter.c:1355
 sk_attach_filter+0x20/0x140 net/core/filter.c:1539
 sock_setsockopt+0x18c7/0x2480 net/core/sock.c:1167
 __sys_setsockopt+0x2f6/0x3d0 net/socket.c:2209

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2026/11/05 23:47 linux-5.15.y 700e62ea909a 5cecaf1f .config console log report info [disk image] [vmlinux] [kernel image] ci2-linux-5-15-kasan INFO: task hung in _vm_unmap_aliases
* Struck through repros no longer work on HEAD.