INFO: task syz-executor.3:10036 blocked for more than 143 seconds.
      Not tainted 5.11.0-rc6-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.3  state:D stack:29696 pid:10036 ppid:  8434 flags:0x00004004
Call Trace:
 context_switch kernel/sched/core.c:4327 [inline]
 __schedule+0x999/0xe70 kernel/sched/core.c:5078
 schedule+0x14b/0x200 kernel/sched/core.c:5157
 rwsem_down_write_slowpath+0xd69/0x1370 kernel/locking/rwsem.c:1106
 __down_write_common kernel/locking/rwsem.c:1261 [inline]
 __down_write kernel/locking/rwsem.c:1270 [inline]
 down_write_nested+0x117/0x120 kernel/locking/rwsem.c:1517
 inode_lock_nested include/linux/fs.h:808 [inline]
 do_unlinkat+0x189/0x7e0 fs/namei.c:3885
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x465b09
RSP: 002b:00007f7ac1229188 EFLAGS: 00000246 ORIG_RAX: 0000000000000057
RAX: ffffffffffffffda RBX: 000000000056c008 RCX: 0000000000465b09
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000000
RBP: 00000000004b069f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c008
R13: 00007ffe4e31a38f R14: 00007f7ac1229300 R15: 0000000000022000

Showing all locks held in the system:
1 lock held by khungtaskd/1643:
 #0: ffffffff8c711780 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 arch/x86/pci/mmconfig_64.c:151
1 lock held by systemd-journal/4867:
1 lock held by in:imklog/8097:
 #0: ffff888018ad80f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x2f0 fs/file.c:947
2 locks held by syz-executor.3/10027:
2 locks held by syz-executor.3/10036:
 #0: ffff88801a94c460 (sb_writers#15){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:354
 #1: ffff888076c48810 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:808 [inline]
 #1: ffff888076c48810 (&type->i_mutex_dir_key#8/1){+.+.}-{3:3}, at: do_unlinkat+0x189/0x7e0 fs/namei.c:3885

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

NMI backtrace for cpu 0
CPU: 0 PID: 1643 Comm: khungtaskd Not tainted 5.11.0-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+0x137/0x1be 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+0xce9/0xd30 kernel/hung_task.c:294
 kthread+0x39a/0x3c0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 8233 Comm: kworker/u4:7 Not tainted 5.11.0-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_memory_region+0x9/0x2f0 mm/kasan/generic.c:184
Code: 07 31 c0 c3 0f 0b b8 ea ff ff ff c3 0f 0b b8 ea ff ff ff c3 cc cc cc cc cc cc cc cc cc cc cc cc cc 41 57 41 56 41 55 41 54 53 <b0> 01 48 85 f6 0f 84 0d 02 00 00 48 89 fb 48 01 f3 0f 82 8d 02 00
RSP: 0018:ffffc9000c93fba0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffffffff815bd981
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8db39a28
RBP: ffffffff892b4765 R08: ffffffff892acaff R09: fffffbfff1f21891
R10: fffffbfff1f21891 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff888014858000 R14: ffff8880139e35d0 R15: ffffffff8c711780
FS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2bc6ff2000 CR3: 000000001d464000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 instrument_atomic_read include/linux/instrumented.h:71 [inline]
 test_bit include/asm-generic/bitops/instrumented-non-atomic.h:134 [inline]
 cpumask_test_cpu include/linux/cpumask.h:373 [inline]
 trace_lock_release+0x31/0x140 include/trace/events/lock.h:58
 lock_release+0x27/0x6b0 kernel/locking/lockdep.c:5453
 rcu_read_unlock include/linux/rcupdate.h:702 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:408 [inline]
 batadv_nc_worker+0x261/0x5c0 net/batman-adv/network-coding.c:715
 process_one_work+0x789/0xfc0 kernel/workqueue.c:2275
 worker_thread+0xac1/0x1300 kernel/workqueue.c:2421
 kthread+0x39a/0x3c0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296