INFO: task kcompactd0:1638 blocked for more than 143 seconds.
      Not tainted 5.13.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kcompactd0      state:D stack:23224 pid: 1638 ppid:     2 flags:0x00004000
Call Trace:
 context_switch kernel/sched/core.c:4339 [inline]
 __schedule+0xb98/0x1120 kernel/sched/core.c:5147
 schedule+0x14b/0x200 kernel/sched/core.c:5226
 io_schedule+0x83/0x100 kernel/sched/core.c:7215
 wait_on_page_bit_common+0x97a/0x1030 mm/filemap.c:1301
 lock_page include/linux/pagemap.h:625 [inline]
 __unmap_and_move+0x924/0xca0 mm/migrate.c:1023
 unmap_and_move+0x339/0xd80 mm/migrate.c:1173
 migrate_pages+0x512/0x1730 mm/migrate.c:1447
 compact_zone+0x2d51/0x3d20 mm/compaction.c:2401
 proactive_compact_node mm/compaction.c:2655 [inline]
 kcompactd+0x1b9c/0x26c0 mm/compaction.c:2925
 kthread+0x39a/0x3c0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294

Showing all locks held in the system:
1 lock held by khungtaskd/1617:
 #0: ffffffff8cf15cc0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 arch/x86/pci/mmconfig_64.c:151
1 lock held by in:imklog/8103:
 #0: ffff88802f62e370 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:974
1 lock held by syz-executor.4/30943:

=============================================

NMI backtrace for cpu 0
CPU: 0 PID: 1617 Comm: khungtaskd Not tainted 5.13.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x202/0x31e lib/dump_stack.c:120
 nmi_cpu_backtrace+0x16c/0x190 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x191/0x2f0 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline]
 watchdog+0xcfb/0xd40 kernel/hung_task.c:294
 kthread+0x39a/0x3c0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 291 Comm: kworker/u4:7 Not tainted 5.13.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: bat_events batadv_nc_worker
RIP: 0010:check_preemption_disabled+0x6c/0x190 lib/smp_processor_id.c:59
Code: 00 00 81 e5 ff ff ff 7f 74 2a 0f 1f 44 00 00 65 48 8b 04 25 28 00 00 00 48 3b 44 24 08 0f 85 1e 01 00 00 89 d8 48 83 c4 10 5b <41> 5c 41 5d 41 5e 41 5f 5d c3 9c 8f 04 24 4c 8b 24 24 bd 00 02 00
RSP: 0018:ffffc90001d3f908 EFLAGS: 00000086
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000080000001
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 0000000000000001 R08: dffffc0000000000 R09: fffffbfff1c7054e
R10: fffffbfff1c7054e R11: 0000000000000000 R12: 0000000000000246
R13: ffff888013788000 R14: ffffffff8a2eac80 R15: ffffffff8a929ec0
FS:  0000000000000000(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007efdf67db000 CR3: 000000001a1c4000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 lockdep_recursion_finish kernel/locking/lockdep.c:438 [inline]
 lock_is_held_type+0xf7/0x180 kernel/locking/lockdep.c:5556
 lock_is_held include/linux/lockdep.h:283 [inline]
 rcu_read_lock_sched_held+0x87/0x110 kernel/rcu/update.c:125
 trace_lock_acquire+0x6b/0x180 include/trace/events/lock.h:13
 lock_acquire+0xa9/0x720 kernel/locking/lockdep.c:5483
 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:267
 rcu_read_lock include/linux/rcupdate.h:657 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:404 [inline]
 batadv_nc_worker+0xc8/0x5c0 net/batman-adv/network-coding.c:715
 process_one_work+0x833/0x10c0 kernel/workqueue.c:2276
 worker_thread+0xac1/0x1300 kernel/workqueue.c:2422
 kthread+0x39a/0x3c0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294