INFO: task syz.3.1850:12373 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.1850      state:D stack:27440 pid:12373 tgid:12369 ppid:5866   task_flags:0x400140 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5357 [inline]
 __schedule+0x1798/0x4cc0 kernel/sched/core.c:6961
 __schedule_loop kernel/sched/core.c:7043 [inline]
 schedule+0x165/0x360 kernel/sched/core.c:7058
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7115
 __mutex_lock_common kernel/locking/mutex.c:676 [inline]
 __mutex_lock+0x7e6/0x1350 kernel/locking/mutex.c:760
 nfsd_nl_threads_set_doit+0x2cb/0x960 fs/nfsd/nfsctl.c:1629
 genl_family_rcv_msg_doit+0x212/0x300 net/netlink/genetlink.c:1115
 genl_family_rcv_msg net/netlink/genetlink.c:1195 [inline]
 genl_rcv_msg+0x60e/0x790 net/netlink/genetlink.c:1210
 netlink_rcv_skb+0x208/0x470 net/netlink/af_netlink.c:2552
 genl_rcv+0x28/0x40 net/netlink/genetlink.c:1219
 netlink_unicast_kernel net/netlink/af_netlink.c:1320 [inline]
 netlink_unicast+0x82f/0x9e0 net/netlink/af_netlink.c:1346
 netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1896
 sock_sendmsg_nosec net/socket.c:714 [inline]
 __sock_sendmsg+0x21c/0x270 net/socket.c:729
 ____sys_sendmsg+0x505/0x830 net/socket.c:2614
 ___sys_sendmsg+0x21f/0x2a0 net/socket.c:2668
 __sys_sendmsg net/socket.c:2700 [inline]
 __do_sys_sendmsg net/socket.c:2705 [inline]
 __se_sys_sendmsg net/socket.c:2703 [inline]
 __x64_sys_sendmsg+0x19b/0x260 net/socket.c:2703
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7429d8ebe9
RSP: 002b:00007f742abe9038 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f7429fb5fa0 RCX: 00007f7429d8ebe9
RDX: 0000000004000000 RSI: 0000200000000780 RDI: 0000000000000003
RBP: 00007f7429e11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7429fb6038 R14: 00007f7429fb5fa0 R15: 00007fff86c28828
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline]
 watchdog+0xf93/0xfe0 kernel/hung_task.c:491
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 1155 Comm: kworker/u8:6 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: bat_events batadv_nc_worker
RIP: 0010:min_vruntime_update kernel/sched/fair.c:826 [inline]
RIP: 0010:min_vruntime_cb_propagate kernel/sched/fair.c:842 [inline]
RIP: 0010:rb_add_augmented_cached include/linux/rbtree_augmented.h:83 [inline]
RIP: 0010:__enqueue_entity+0x2b6/0x5e0 kernel/sched/fair.c:853
Code: 00 00 00 00 00 fc ff df 42 80 3c 28 00 74 08 4c 89 f7 e8 bd db 8d 00 49 89 1e eb 0e 4d 8b 24 24 49 83 e4 fc 0f 84 a7 02 00 00 <49> 8d 5c 24 20 48 89 d8 48 c1 e8 03 48 89 44 24 10 42 80 3c 28 00
RSP: 0018:ffffc900000078c8 EFLAGS: 00000086
RAX: 1ffff1100f954792 RBX: ffff88807caa3cb0 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff88807caa3cf0
RBP: ffff88807caa3cb8 R08: ffff88801a5d80a7 R09: 0000000000000000
R10: ffff88801a5d8098 R11: ffffed10034bb015 R12: ffff88802abb0090
R13: dffffc0000000000 R14: ffff8880446d9eb8 R15: 0000000000155cc0
FS:  0000000000000000(0000) GS:ffff888125c1a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fca0e390000 CR3: 000000004c3c0000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 enqueue_entity+0x3fe/0x1120 kernel/sched/fair.c:5289
 enqueue_task_fair+0x25a/0x1470 kernel/sched/fair.c:6876
 enqueue_task+0x75/0x420 kernel/sched/core.c:2090
 activate_task kernel/sched/core.c:2132 [inline]
 ttwu_do_activate+0x1f3/0x870 kernel/sched/core.c:3741
 ttwu_queue kernel/sched/core.c:4004 [inline]
 try_to_wake_up+0x721/0x12b0 kernel/sched/core.c:4328
 call_timer_fn+0x17e/0x5f0 kernel/time/timer.c:1747
 expire_timers kernel/time/timer.c:1798 [inline]
 __run_timers kernel/time/timer.c:2372 [inline]
 __run_timer_base+0x61a/0x860 kernel/time/timer.c:2384
 run_timer_base kernel/time/timer.c:2393 [inline]
 run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2403
 handle_softirqs+0x283/0x870 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:should_resched arch/x86/include/asm/preempt.h:104 [inline]
RIP: 0010:__local_bh_enable_ip+0x135/0x1c0 kernel/softirq.c:414
Code: 8b e8 9f 2a f5 09 65 66 8b 05 4f 78 1b 11 66 85 c0 75 5a bf 01 00 00 00 e8 68 15 0b 00 e8 c3 6c 42 00 fb 65 8b 05 2b 78 1b 11 <85> c0 75 05 e8 e2 de ae ff 48 c7 04 24 0e 36 e0 45 4b c7 04 37 00
RSP: 0018:ffffc90003def8e0 EFLAGS: 00000282
RAX: 0000000080000000 RBX: 0000000000000201 RCX: 8b1076852fbff900
RDX: 0000000000000000 RSI: ffffffff8be33660 RDI: ffffffff8184e7fd
RBP: ffffc90003def978 R08: ffffffff8fa38537 R09: 1ffffffff1f470a6
R10: dffffc0000000000 R11: fffffbfff1f470a7 R12: ffffffff8b47fc38
R13: dffffc0000000000 R14: dffffc0000000000 R15: 1ffff920007bdf1c
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 batadv_nc_purge_paths+0x318/0x3b0 net/batman-adv/network-coding.c:471
 batadv_nc_worker+0x369/0x610 net/batman-adv/network-coding.c:722
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3f9/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>