INFO: task syz-executor.0:5413 blocked for more than 143 seconds.
      Not tainted 6.5.0-next-20230905-syzkaller-13985-gc50216cfa084 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.0  state:D stack:28464 pid:5413  ppid:5392   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0xee1/0x59f0 kernel/sched/core.c:6695
 schedule+0xe7/0x1b0 kernel/sched/core.c:6771
 schedule_timeout+0x27a/0x2c0 kernel/time/timer.c:2143
 do_wait_for_common kernel/sched/completion.c:95 [inline]
 __wait_for_common+0x3e2/0x5f0 kernel/sched/completion.c:116
 __flush_workqueue+0x3e9/0x1330 kernel/workqueue.c:3195
 nbd_start_device_ioctl drivers/block/nbd.c:1426 [inline]
 __nbd_ioctl drivers/block/nbd.c:1486 [inline]
 nbd_ioctl+0x308/0xc50 drivers/block/nbd.c:1526
 blkdev_ioctl+0x2f9/0x770 block/ioctl.c:628
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:871 [inline]
 __se_sys_ioctl fs/ioctl.c:857 [inline]
 __x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857
 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: 0033:0x456e69
RSP: 002b:00007fb84e0360d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 000000000055bf80 RCX: 0000000000456e69
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000003
RBP: 00000000004b0cab R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000004b02b7
R13: 000000000000000b R14: 000000000055bf80 R15: 00007ffdcfb72ae8
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.5.0-next-20230905-syzkaller-13985-gc50216cfa084 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x277/0x380 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x299/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xfac/0x1230 kernel/hung_task.c:379
 kthread+0x33a/0x430 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 77 Comm: kworker/u4:4 Not tainted 6.5.0-next-20230905-syzkaller-13985-gc50216cfa084 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Workqueue: bat_events batadv_nc_worker
RIP: 0010:batadv_nc_worker+0x0/0x10f0 net/batman-adv/network-coding.c:709
Code: 48 8b 7c 24 30 e8 70 c0 d4 f7 e9 73 fc ff ff 48 89 df e8 83 c0 d4 f7 e9 2b fd ff ff 4c 89 e7 e8 76 c0 d4 f7 e9 b4 fc ff ff 90 <f3> 0f 1e fa 41 57 41 56 49 89 fe 41 55 41 54 55 53 48 bb 00 00 00
RSP: 0018:ffffc900015c7cf0 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: ffff8880162b4500 RCX: 0000000000000000
RDX: 1ffff11002c568a3 RSI: ffffffff8155c1e5 RDI: ffff888027c296e0
RBP: ffff888027c296e0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000800 R12: ffff8880242aec00
R13: 0000000000000001 R14: ffffc900015c7d88 R15: ffff888013641000
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000562eafb32680 CR3: 000000000c976000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 process_one_work+0x887/0x15d0 kernel/workqueue.c:2630
 process_scheduled_works kernel/workqueue.c:2703 [inline]
 worker_thread+0x8bb/0x1290 kernel/workqueue.c:2784
 kthread+0x33a/0x430 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>