INFO: task syz.0.4654:22479 blocked for more than 143 seconds.
      Not tainted 6.12.0-rc6-next-20241108-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.4654      state:D stack:24304 pid:22479 tgid:22475 ppid:19908  flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5369 [inline]
 __schedule+0x1850/0x4c30 kernel/sched/core.c:6753
 __schedule_loop kernel/sched/core.c:6830 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6845
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6902
 __mutex_lock_common kernel/locking/mutex.c:665 [inline]
 __mutex_lock+0x7e7/0xee0 kernel/locking/mutex.c:735
 hfs_find_init+0x16e/0x1f0
 hfs_ext_read_extent fs/hfs/extent.c:200 [inline]
 hfs_extend_file+0x31b/0x1450 fs/hfs/extent.c:401
 hfs_bmap_reserve+0xd9/0x400 fs/hfs/btree.c:234
 __hfs_ext_write_extent+0x22e/0x4f0 fs/hfs/extent.c:121
 __hfs_ext_cache_extent+0x6a/0x990 fs/hfs/extent.c:174
 hfs_ext_read_extent fs/hfs/extent.c:202 [inline]
 hfs_extend_file+0x344/0x1450 fs/hfs/extent.c:401
 hfs_get_block+0x3e4/0xb60 fs/hfs/extent.c:353
 __block_write_begin_int+0x50c/0x1a70 fs/buffer.c:2116
 block_write_begin fs/buffer.c:2226 [inline]
 cont_write_begin+0x6e2/0x9d0 fs/buffer.c:2577
 hfs_write_begin+0x68/0xb0 fs/hfs/inode.c:52
 generic_perform_write+0x344/0x6d0 mm/filemap.c:4055
 generic_file_write_iter+0xae/0x310 mm/filemap.c:4182
 new_sync_write fs/read_write.c:586 [inline]
 vfs_write+0xaeb/0xd30 fs/read_write.c:679
 ksys_write+0x18f/0x2b0 fs/read_write.c:731
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2dfd77e719
RSP: 002b:00007f2dfe549038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f2dfd935f80 RCX: 00007f2dfd77e719
RDX: 000000000208e24b RSI: 0000000020000240 RDI: 0000000000000008
RBP: 00007f2dfd7f139e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f2dfd935f80 R15: 00007ffe43d7f668
 </TASK>
INFO: lockdep is turned off.
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc6-next-20241108-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:234 [inline]
 watchdog+0xffb/0x1040 kernel/hung_task.c:397
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 12245 Comm: kworker/u8:13 Not tainted 6.12.0-rc6-next-20241108-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
Workqueue: bat_events batadv_nc_worker
RIP: 0010:rcu_read_unlock include/linux/rcupdate.h:878 [inline]
RIP: 0010:batadv_nc_process_nc_paths+0x27a/0x3a0 net/batman-adv/network-coding.c:699
Code: f6 e8 3a 4c 34 00 89 c5 31 ff 89 c6 e8 4f a6 0f f6 85 ed 74 15 e8 96 26 f5 f5 84 c0 74 18 e8 fd a1 0f f6 48 8b 6c 24 08 eb 65 <e8> f1 a1 0f f6 48 8b 6c 24 08 eb 59 e8 05 4c 34 00 89 c5 31 ff 89
RSP: 0018:ffffc9000533fae8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff888060f14d80 RCX: ffff88802f50da00
RDX: ffff88802f50da00 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff8b8fda01 R09: 1ffffffff203910e
R10: dffffc0000000000 R11: fffffbfff203910f R12: ffff888060f14d80
R13: 1ffff1100c1e2b14 R14: ffff88807c141ac0 R15: ffffffff8b8fde90
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f14f9924f98 CR3: 000000007a96a000 CR4: 00000000003526f0
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 batadv_nc_worker+0x52c/0x610 net/batman-adv/network-coding.c:735
 process_one_work kernel/workqueue.c:3229 [inline]
 process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310
 worker_thread+0x870/0xd30 kernel/workqueue.c:3391
 kthread+0x2f0/0x390 kernel/kthread.c:389
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>