INFO: task syz-executor.1:11815 blocked for more than 143 seconds.
      Not tainted 6.5.0-rc4-next-20230804-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:28744 pid:11815 ppid:9548   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0xee1/0x59f0 kernel/sched/core.c:6711
 schedule+0xe7/0x1b0 kernel/sched/core.c:6787
 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:3180
 nbd_start_device_ioctl drivers/block/nbd.c:1426 [inline]
 __nbd_ioctl drivers/block/nbd.c:1488 [inline]
 nbd_ioctl+0x30d/0xd30 drivers/block/nbd.c:1528
 blkdev_ioctl+0x2f9/0x770 block/ioctl.c:621
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl fs/ioctl.c:856 [inline]
 __x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:856
 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: 0033:0x7f15fb87cae9
RSP: 002b:00007f15fc5e50c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f15fb99c050 RCX: 00007f15fb87cae9
RDX: 0000000000000000 RSI: 000000000000ab03 RDI: 0000000000000005
RBP: 00007f15fb8c847a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f15fb99c050 R15: 00007ffdfe389178
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 PID: 28 Comm: khungtaskd Not tainted 6.5.0-rc4-next-20230804-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
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+0x2ac/0x310 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+0xfab/0x1230 kernel/hung_task.c:379
 kthread+0x33a/0x430 kernel/kthread.c:389
 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 57 Comm: kworker/u4:4 Not tainted 6.5.0-rc4-next-20230804-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2023
Workqueue: bat_events batadv_nc_worker
RIP: 0010:bytes_is_nonzero mm/kasan/generic.c:85 [inline]
RIP: 0010:memory_is_nonzero mm/kasan/generic.c:102 [inline]
RIP: 0010:memory_is_poisoned_n mm/kasan/generic.c:127 [inline]
RIP: 0010:memory_is_poisoned mm/kasan/generic.c:159 [inline]
RIP: 0010:check_region_inline mm/kasan/generic.c:178 [inline]
RIP: 0010:kasan_check_range+0x10a/0x190 mm/kasan/generic.c:187
Code: b8 01 00 00 00 7c 0b 44 89 c2 e8 f1 ed ff ff 83 f0 01 5b 5d 41 5c c3 48 85 d2 74 4f 48 01 ea eb 09 48 83 c0 01 48 39 d0 74 41 <80> 38 00 74 f2 eb b6 41 bc 08 00 00 00 45 29 dc 49 8d 14 2c eb 0c
RSP: 0018:ffffc90001587af0 EFLAGS: 00000082
RAX: fffffbfff1d598ca RBX: fffffbfff1d598cb RCX: ffffffff818d700b
RDX: fffffbfff1d598cb RSI: 0000000000000008 RDI: ffffffff8eacc650
RBP: fffffbfff1d598ca R08: 0000000000000000 R09: fffffbfff1d598ca
R10: ffffffff8eacc657 R11: 0000000000000000 R12: ffffffff8a022630
R13: ffff888038c78c80 R14: ffff888078507b80 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f72e6cc56be CR3: 000000000c776000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 instrument_atomic_read include/linux/instrumented.h:68 [inline]
 _test_bit include/asm-generic/bitops/instrumented-non-atomic.h:141 [inline]
 cpumask_test_cpu include/linux/cpumask.h:504 [inline]
 cpu_online include/linux/cpumask.h:1082 [inline]
 trace_irq_disable include/trace/events/preemptirq.h:36 [inline]
 trace_hardirqs_off_finish kernel/trace/trace_preemptirq.c:78 [inline]
 trace_hardirqs_off+0x5b/0x120 kernel/trace/trace_preemptirq.c:73
 __local_bh_enable_ip+0xc7/0x120 kernel/softirq.c:363
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 batadv_nc_purge_paths+0x1ce/0x3c0 net/batman-adv/network-coding.c:471
 batadv_nc_worker+0x986/0x10f0 net/batman-adv/network-coding.c:720
 process_one_work+0xaa2/0x16f0 kernel/workqueue.c:2603
 worker_thread+0x687/0x1110 kernel/workqueue.c:2754
 kthread+0x33a/0x430 kernel/kthread.c:389
 ret_from_fork+0x2c/0x70 arch/x86/kernel/process.c:145
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>