INFO: task syz.0.12957:5713 blocked for more than 143 seconds.
INFO: task syz.0.12957:5713 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.12957     state:D stack:27424 pid:5713  tgid:5712  ppid:5593   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17db/0x58f0
 schedule+0x164/0x2b0
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7c1/0x1550
 nfsd_nl_expkey_set_reqs_doit+0xfe/0xaf0
 genl_family_rcv_msg_doit+0x233/0x340
 genl_rcv_msg+0x614/0x7a0
 netlink_rcv_skb+0x226/0x4a0
 genl_rcv+0x28/0x40
 netlink_unicast+0x7bd/0x940
 netlink_sendmsg+0x813/0xb40
 sock_sendmsg_nosec+0x13a/0x180
 ____sys_sendmsg+0x54e/0x850
 ___sys_sendmsg+0x2a5/0x360
 __x64_sys_sendmsg+0x1b1/0x290
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa8a939e159
RSP: 002b:00007fa8aa201028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007fa8a9625fa0 RCX: 00007fa8a939e159
RDX: 0000000000000000 RSI: 0000200000000000 RDI: 0000000000000004
RBP: 00007fa8a943506b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa8a9626038 R14: 00007fa8a9625fa0 R15: 00007ffcf10f9b98
 </TASK>

Showing all locks held in the system:
locks held by khungtaskd/35: 1, last CPU#0:
 #0: ffffffff8ed5c8e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
locks held by getty/5424: 2, on CPU#0:
 #0: ffff88816a0220a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900034762e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360
locks held by syz.2.12874/5409: 2, on CPU#1:
 #0: ffffffff902c4768 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40
 #1: ffffffff8f09f580 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_listener_set_doit+0x53d/0x1ab0
locks held by syz.0.12957/5713: 2, on CPU#1:
 #0: ffffffff902c4768 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40
 #1: ffffffff8f09f580 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_expkey_set_reqs_doit+0xfe/0xaf0
locks held by syz-executor/5898: 8, last CPU#1:
 #0: ffffffff8ee363b0 (dup_mmap_sem){++++}-{0:0}, at: copy_mm+0x10f/0x480
 #1: ffff8881725903b8 (&mm->mmap_lock){++++}-{4:4}, at: dup_mmap+0x195/0x1dc0
 #2: ffff888170645cf8 (&mm->mmap_lock/1){+.+.}-{4:4}, at: dup_mmap+0x221/0x1dc0
 #3: ffffffff8ed5c8e0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x29/0x240
 #4: ffff88816b940a98 (ptlock_ptr(ptdesc)#2){+.+.}-{3:3}, at: pte_offset_map_lock+0x13d/0x210
 #5: ffffffff8ed5c8e0 (rcu_read_lock){....}-{1:3}, at: __pte_offset_map+0x29/0x240
 #6: ffff8881b6cdc618 (ptlock_ptr(ptdesc)#2/1){+.+.}-{3:3}, at: copy_pmd_range+0x6fb/0x5c10
 #7: ffffffff8ed5c8e0 (rcu_read_lock){....}-{1:3}, at: pfn_valid+0xba/0x490
locks held by syz.1.14095/10012: 3, last CPU#0:
 #0: ffff8881103cb660 (sk_lock-AF_INET){+.+.}-{0:0}, at: tcp_sendmsg+0x21/0x50
 #1: ffffffff8ed5c8e0 (rcu_read_lock){....}-{1:3}, at: __ip_queue_xmit+0x65/0x1b10
 #2: ffffffff8ed5c8e0 (rcu_read_lock){....}-{1:3}, at: nf_hook+0xa1/0x3a0

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 35 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17d/0x390
 sys_info+0x135/0x170
 watchdog+0xfd7/0x1030
 kthread+0x38b/0x480
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 5898 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:copy_pmd_range+0x712/0x5c10
Code: c6 48 8b bc 24 e0 01 00 00 be 01 00 00 00 e8 85 eb c9 09 48 c7 44 24 08 00 00 00 00 31 db bf 1f 00 00 00 89 de e8 5e ea a8 ff <83> fb 1f 7e 54 4c 89 f3 65 4c 8b 35 d6 42 76 11 4c 89 f0 48 c1 e8
RSP: 0018:ffffc9000485f300 EFLAGS: 00000293
RAX: ffffffff821eed22 RBX: 0000000000000010 RCX: ffff88816eac0000
RDX: 0000000000000000 RSI: 0000000000000010 RDI: 000000000000001f
RBP: ffffc9000485f590 R08: ffff8881628e924f R09: 1ffff1102c51d249
R10: dffffc0000000000 R11: ffffed102c51d24a R12: 00007fceea29e000
R13: 00007fceea3fd000 R14: ffff888166b314f0 R15: dffffc0000000000
FS:  0000555585f9a500(0000) GS:ffff8882a8ccd000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f89e7b5da08 CR3: 000000016fdfe000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 copy_page_range+0xc82/0x1290
 dup_mmap+0xf17/0x1dc0
 copy_mm+0x11a/0x480
 copy_process+0x1e75/0x43e0
 kernel_clone+0x2d7/0x940
 __x64_sys_clone+0x1b6/0x230
 do_syscall_64+0x166/0x520
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fceea9c6bd2
Code: 89 e7 e8 71 8b f7 ff 45 31 c0 31 d2 31 f6 64 48 8b 04 25 10 00 00 00 bf 11 00 20 01 4c 8d 90 d0 02 00 00 b8 38 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 66 89 c5 85 c0 75 3b 64 48 8b 04 25 10 00 00
RSP: 002b:00007ffe431b4330 EFLAGS: 00000246 ORIG_RAX: 0000000000000038
RAX: ffffffffffffffda RBX: 00007ffe431b4330 RCX: 00007fceea9c6bd2
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001200011
RBP: 00007ffe431b44bc R08: 0000000000000000 R09: 0000000000000001
R10: 0000555585f9a7d0 R11: 0000000000000246 R12: 0000000000000001
R13: 00000000000927c0 R14: 00000000000bfb7d R15: 00007ffe431b4510
 </TASK>
