INFO: task syz-executor.4:17790 blocked for more than 143 seconds.
      Not tainted 6.0.0-syzkaller-09589-g55be6084c8e0 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.4  state:D stack:27896 pid:17790 ppid:3647   flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5178 [inline]
 __schedule+0x8f3/0xd90 kernel/sched/core.c:6490
 schedule+0xcb/0x190 kernel/sched/core.c:6566
 schedule_timeout+0xac/0x300 kernel/time/timer.c:1911
 do_wait_for_common+0x3ea/0x560 kernel/sched/completion.c:85
 __wait_for_common kernel/sched/completion.c:106 [inline]
 wait_for_common kernel/sched/completion.c:117 [inline]
 wait_for_completion+0x46/0x60 kernel/sched/completion.c:138
 __flush_work+0x124/0x1a0 kernel/workqueue.c:3073
 __cancel_work_timer+0x517/0x6a0 kernel/workqueue.c:3160
 p9_conn_destroy net/9p/trans_fd.c:890 [inline]
 p9_fd_close+0x2c5/0x410 net/9p/trans_fd.c:920
 p9_client_create+0xa16/0x1030 net/9p/client.c:1001
 v9fs_session_init+0x1e3/0x1990 fs/9p/v9fs.c:408
 v9fs_mount+0xd2/0xcb0 fs/9p/vfs_super.c:126
 legacy_get_tree+0xea/0x180 fs/fs_context.c:610
 vfs_get_tree+0x88/0x270 fs/super.c:1530
 do_new_mount+0x289/0xad0 fs/namespace.c:3040
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x2e3/0x3d0 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fa7be68b5a9
RSP: 002b:00007fa7bf7da168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fa7be7ac050 RCX: 00007fa7be68b5a9
RDX: 0000000020000040 RSI: 0000000020000180 RDI: 0000000000000000
RBP: 00007fa7be6e6580 R08: 0000000020000340 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc4780bb5f R14: 00007fa7bf7da300 R15: 0000000000022000
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.0.0-syzkaller-09589-g55be6084c8e0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
 nmi_cpu_backtrace+0x47c/0x4b0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x169/0x280 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
 watchdog+0xcd5/0xd20 kernel/hung_task.c:377
 kthread+0x266/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 15575 Comm: kworker/u4:9 Not tainted 6.0.0-syzkaller-09589-g55be6084c8e0 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/22/2022
Workqueue: bat_events batadv_mcast_mla_update
RIP: 0010:trace_irq_disable_rcuidle+0xd/0xf0 include/trace/events/preemptirq.h:36
Code: 00 65 8b 05 9d 3e 73 7e a9 00 00 f0 00 74 02 5b c3 48 89 df 31 f6 5b eb 04 0f 1f 40 00 55 41 57 41 56 53 66 90 5b 41 5e 41 5f <5d> c3 49 89 f6 48 89 fb 65 8b 05 fc e8 72 7e 83 f8 08 0f 83 bb 00
RSP: 0018:ffffc900046175b0 EFLAGS: 00000046
RAX: 0000000080000000 RBX: 0000000000000246 RCX: 0000000000000000
RDX: ffff88807c373b00 RSI: 0000000000000000 RDI: ffffffff81dd363e
RBP: ffffc900046176d0 R08: ffffffff81dd35c9 R09: fffffbfff19c1431
R10: fffffbfff19c1431 R11: 1ffffffff19c1430 R12: 0000000000000200
R13: ffffffff91866510 R14: ffffc90004617660 R15: 1ffffffff230cca3
FS:  0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe47a4be300 CR3: 000000000ca8e000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 kfence_guarded_alloc+0x2ee/0xb80 mm/kfence/core.c:379
 __kfence_alloc+0x8d2/0xaf0 mm/kfence/core.c:1042
 kfence_alloc include/linux/kfence.h:128 [inline]
 slab_alloc_node mm/slub.c:3166 [inline]
 slab_alloc mm/slub.c:3256 [inline]
 kmem_cache_alloc_trace+0x2b9/0x310 mm/slub.c:3287
 kmalloc include/linux/slab.h:600 [inline]
 batadv_mcast_mla_softif_get_ipv4 net/batman-adv/multicast.c:374 [inline]
 batadv_mcast_mla_softif_get net/batman-adv/multicast.c:501 [inline]
 __batadv_mcast_mla_update net/batman-adv/multicast.c:879 [inline]
 batadv_mcast_mla_update+0xb51/0x3a20 net/batman-adv/multicast.c:916
 process_one_work+0x81c/0xd10 kernel/workqueue.c:2289
 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436
 kthread+0x266/0x300 kernel/kthread.c:376
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>