INFO: task syz-executor:833 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:21616 pid:833 tgid:833 ppid:1 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5581 [inline]
__schedule+0x1b47/0x5b40 kernel/sched/core.c:7384
__schedule_loop kernel/sched/core.c:7461 [inline]
schedule+0x164/0x2b0 kernel/sched/core.c:7476
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7533
__mutex_lock_common kernel/locking/mutex.c:726 [inline]
__mutex_lock+0x7c4/0x15a0 kernel/locking/mutex.c:821
nfsd_shutdown_threads+0x4e/0xd0 fs/nfsd/nfssvc.c:590
nfsd_umount+0x41/0x60 fs/nfsd/nfsctl.c:1379
deactivate_locked_super+0xbe/0x110 fs/super.c:586
cleanup_mnt+0x3d3/0x460 fs/namespace.c:1329
task_work_run+0x1d9/0x260 kernel/task_work.c:233
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
__exit_to_user_mode_loop kernel/entry/common.c:70 [inline]
exit_to_user_mode_loop+0x204/0x770 kernel/entry/common.c:101
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f32af79f397
RSP: 002b:00007ffca08ae818 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f32af8344bb RCX: 00007f32af79f397
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffca08ae8d0
RBP: 00007ffca08ae8d0 R08: 00007ffca08af8d0 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffca08af960
R13: 00007f32af8344bb R14: 0000000000119aee R15: 00007ffca08af9a0
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:123
nmi_trigger_cpumask_backtrace+0x17d/0x390 lib/nmi_backtrace.c:66
trigger_all_cpu_backtrace include/linux/nmi.h:164 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:377 [inline]
watchdog+0x1058/0x10d0 kernel/hung_task.c:598
kthread+0x38b/0x480 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 8888 Comm: dhcpcd-run-hook Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:mas_data_end lib/maple_tree.c:1332 [inline]
RIP: 0010:mt_validate_nulls lib/maple_tree.c:7067 [inline]
RIP: 0010:mt_validate+0x3cf8/0x4260 lib/maple_tree.c:7115
Code: 9b be 04 00 00 00 e8 a7 f6 41 f6 f0 ff 05 c0 69 44 0f 48 c7 c7 e0 9b 3d 9b be 04 00 00 00 e8 8f f6 41 f6 f0 ff 05 c8 69 44 0f <4c> 8b b4 24 b8 00 00 00 45 89 f7 41 c1 ef 03 41 83 e7 0f 49 81 e6
RSP: 0018:ffffc90004cbee20 EFLAGS: 00000207
RAX: ffffffff8bf93101 RBX: ffff88801fee6240 RCX: ffffffff8bf93211
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff9b3d9be0
RBP: ffffc90004cbf010 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff367b37c R12: ffff888065b6c280
R13: ffff888064828280 R14: ffff88801fee6240 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888124622000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe2ac689000 CR3: 0000000033c76000 CR4: 00000000003526f0
Call Trace:
validate_mm+0xd4/0x4c0 mm/vma.c:697
__split_vma+0x928/0xa70 mm/vma.c:615
vms_gather_munmap_vmas+0x322/0x1370 mm/vma.c:1511
__mmap_setup mm/vma.c:2565 [inline]
__mmap_region mm/vma.c:3032 [inline]
mmap_region+0x951/0x2c30 mm/vma.c:3134
do_mmap+0xe0a/0x1300 mm/mmap.c:573
vm_mmap_pgoff+0x272/0x4e0 mm/util.c:581
ksys_mmap_pgoff+0x4dc/0x760 mm/mmap.c:619
do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe2ac6b4242
Code: 08 00 04 00 00 eb e2 90 41 f7 c1 ff 0f 00 00 75 27 55 89 cd 53 48 89 fb 48 85 ff 74 33 41 89 ea 48 89 df b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 5e 5b 5d c3 0f 1f 00 c7 05 46 40 01 00 16 00
RSP: 002b:00007ffe881f1df8 EFLAGS: 00000206 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007fe2ac3e4000 RCX: 00007fe2ac6b4242
RDX: 0000000000000003 RSI: 0000000000002000 RDI: 00007fe2ac3e4000
RBP: 0000000000000812 R08: 0000000000000003 R09: 000000000000e000
R10: 0000000000000812 R11: 0000000000000206 R12: 00007ffe881f1eb8
R13: 00007fe2ac688b20 R14: 00007ffe881f2230 R15: 00000fffd103e3c2