syzbot

INFO: task syz.1.77:6356 blocked for more than 143 seconds.
      Not tainted 6.15.0-rc3-syzkaller-00032-ga79be02bba5c #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.77        state:D
 stack:27944 pid:6356  tgid:6345  ppid:5942   task_flags:0x400040 flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x1b33/0x51f0 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0x163/0x360 kernel/sched/core.c:6860
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6917
 rwsem_down_write_slowpath+0xedd/0x1420 kernel/locking/rwsem.c:1176
 __down_write_common kernel/locking/rwsem.c:1304 [inline]
 __down_write kernel/locking/rwsem.c:1313 [inline]
 down_write+0x1da/0x220 kernel/locking/rwsem.c:1578
 inode_lock include/linux/fs.h:867 [inline]
 do_truncate+0x20e/0x310 fs/open.c:63
 vfs_truncate+0x4a6/0x540 fs/open.c:115
 do_sys_truncate+0xd8/0x190 fs/open.c:138
 __do_sys_truncate fs/open.c:150 [inline]
 __se_sys_truncate fs/open.c:148 [inline]
 __x64_sys_truncate+0x5b/0x70 fs/open.c:148
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf3/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7f6778e969
RSP: 002b:00007f7f6853e038 EFLAGS: 00000246
 ORIG_RAX: 000000000000004c
RAX: fffffffffffffffb RBX: 00007f7f679b6080 RCX: 00007f7f6778e969
RDX: 0000000000000000 RSI: 0000000000008001 RDI: 00002000000000c0
RBP: 00007f7f67810ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f7f679b6080 R15: 00007ffd49785e98
 </TASK>

Showing all locks held in the system:
5 locks held by kworker/u8:1/13:
 #0: 
ffff88801bef3948
 ((wq_completion)netns
){+.+.}-{0:0}
, at: process_one_work kernel/workqueue.c:3213 [inline]
, at: process_scheduled_works+0x990/0x18e0 kernel/workqueue.c:3319
 #1: 
ffffc90000127c60
 (
net_cleanup_work
){+.+.}-{0:0}
, at: process_one_work kernel/workqueue.c:3214 [inline]
, at: process_scheduled_works+0x9cb/0x18e0 kernel/workqueue.c:3319
 #2: 
ffffffff900dea10
 (
pernet_ops_rwsem
){++++}-{4:4}
, at: cleanup_net+0x17c/0xd60 net/core/net_namespace.c:608
 #3: 
ffffffff900eb548
 (
rtnl_mutex
){+.+.}-{4:4}
, at: cleanup_net+0x6c1/0xd60 net/core/net_namespace.c:644
 #4: 
ffffffff8ed43438
 (
rcu_state.exp_mutex