INFO: task syz-executor.1:9740 blocked for more than 143 seconds.
      Not tainted 6.5.0-syzkaller-11704-g3f86ed6ec0b3 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.1  state:D stack:25424 pid:9740  ppid:5073   flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x1873/0x48f0 kernel/sched/core.c:6695
 schedule+0xc3/0x180 kernel/sched/core.c:6771
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6830
 rwsem_down_write_slowpath+0xedd/0x13a0 kernel/locking/rwsem.c:1178
 __down_write_common+0x1aa/0x200 kernel/locking/rwsem.c:1306
 do_remount fs/namespace.c:2879 [inline]
 path_mount+0xbdd/0xfa0 fs/namespace.c:3654
 do_mount fs/namespace.c:3675 [inline]
 __do_sys_mount fs/namespace.c:3884 [inline]
 __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3861
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fdc0187cae9
RSP: 002b:00007fdc024f50c8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fdc0199bf80 RCX: 00007fdc0187cae9
RDX: 0000000000000000 RSI: 0000000020015c00 RDI: 0000000000000000
RBP: 00007fdc018c847a R08: 0000000020017cc0 R09: 0000000000000000
R10: 0000000000080024 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fdc0199bf80 R15: 00007ffd6de58058
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.5.0-syzkaller-11704-g3f86ed6ec0b3 #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+0x1e7/0x2d0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x498/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x310 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+0xdf5/0xe40 kernel/hung_task.c:379
 kthread+0x2b8/0x350 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 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: 48 Comm: kworker/u4:3 Not tainted 6.5.0-syzkaller-11704-g3f86ed6ec0b3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023
Workqueue: bat_events batadv_nc_worker
RIP: 0010:variable_test_bit arch/x86/include/asm/bitops.h:228 [inline]
RIP: 0010:arch_test_bit arch/x86/include/asm/bitops.h:240 [inline]
RIP: 0010:_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:142 [inline]
RIP: 0010:cpumask_test_cpu include/linux/cpumask.h:504 [inline]
RIP: 0010:cpu_active include/linux/cpumask.h:1097 [inline]
RIP: 0010:is_cpu_allowed+0xf8/0x1f0 kernel/sched/core.c:2483
Code: f6 45 02 20 75 26 41 83 fe 08 0f 83 b5 00 00 00 48 8d 3c dd c0 39 9a 8e be 08 00 00 00 e8 70 ce 84 00 4c 0f a3 3d 98 83 37 0d <eb> 78 4c 89 e7 e8 8e de fa ff 84 c0 74 26 41 83 fe 08 0f 83 8a 00
RSP: 0018:ffffc90000007a48 EFLAGS: 00000057
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffffffff8162b620
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8e9a39c0
RBP: ffff888016b8596c R08: ffffffff8e9a39c7 R09: 1ffffffff1d34738
R10: dffffc0000000000 R11: fffffbfff1d34739 R12: ffff888016b85940
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0df5b77978 CR3: 00000000410c4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <IRQ>
 select_task_rq kernel/sched/core.c:3645 [inline]
 try_to_wake_up+0x597/0x12f0 kernel/sched/core.c:4331
 autoremove_wake_function kernel/sched/wait.c:424 [inline]
 wake_bit_function+0xd8/0x220 kernel/sched/wait_bit.c:31
 __wake_up_common+0x2a0/0x4e0 kernel/sched/wait.c:107
 __wake_up_common_lock kernel/sched/wait.c:138 [inline]
 __wake_up kernel/sched/wait.c:160 [inline]
 __wake_up_bit kernel/sched/wait_bit.c:126 [inline]
 wake_up_bit+0x218/0x2c0 kernel/sched/wait_bit.c:149
 unlock_buffer fs/buffer.c:79 [inline]
 end_buffer_write_sync+0x103/0x180 fs/buffer.c:174
 end_bio_bh_io_sync+0xb7/0x110 fs/buffer.c:2768
 req_bio_endio block/blk-mq.c:783 [inline]
 blk_update_request+0x53f/0x1020 block/blk-mq.c:928
 blk_mq_end_request+0x3e/0x70 block/blk-mq.c:1051
 blk_complete_reqs block/blk-mq.c:1131 [inline]
 blk_done_softirq+0x103/0x150 block/blk-mq.c:1136
 __do_softirq+0x2ab/0x908 kernel/softirq.c:553
 do_softirq+0x11b/0x1e0 kernel/softirq.c:454
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0x1b5/0x1f0 kernel/softirq.c:381
 spin_unlock_bh include/linux/spinlock.h:396 [inline]
 batadv_nc_purge_paths+0x309/0x3a0 net/batman-adv/network-coding.c:471
 batadv_nc_worker+0x2d3/0x5c0 net/batman-adv/network-coding.c:720
 process_one_work+0x781/0x1130 kernel/workqueue.c:2630
 process_scheduled_works kernel/workqueue.c:2703 [inline]
 worker_thread+0xabf/0x1060 kernel/workqueue.c:2784
 kthread+0x2b8/0x350 kernel/kthread.c:388
 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304
 </TASK>