INFO: task syz.2.166:7113 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.166       state:D stack:28184 pid:7113  tgid:7108  ppid:5844   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x14ef/0x4fb0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 rwsem_down_write_slowpath+0x8a1/0x1080
 down_write+0x1bc/0x200
 vfs_fileattr_set+0x161/0xc90
 ioctl_fssetxattr+0x21a/0x290
 do_vfs_ioctl+0x900/0x1530
 __se_sys_ioctl+0x82/0x170
 do_syscall_64+0xe2/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8a4ab9acb9
RSP: 002b:00007f8a4b9d1028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f8a4ae16090 RCX: 00007f8a4ab9acb9
RDX: 0000200000000100 RSI: 00000000401c5820 RDI: 0000000000000006
RBP: 00007f8a4ac08bf7 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f8a4ae16128 R14: 00007f8a4ae16090 R15: 00007ffe49d73398
 </TASK>

Showing all locks held in the system:
1 lock held by rcu_exp_gp_kthr/18:
 #0: ffff88823c63a918 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140
1 lock held by khungtaskd/35:
 #0: ffffffff8e341b60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
4 locks held by kworker/u9:4/1015:
 #0: ffff8881604eb148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0
 #1: ffffc90007e2fbc0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0
 #2: ffff88811dc020e0 (&type->s_umount_key#55){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0
 #3: ffff888118f12f90 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x1ca/0x530
2 locks held by getty/5657:
 #0: ffff8881152e80a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
4 locks held by syz.2.166/7109:
2 locks held by syz.2.166/7113:
 #0: ffff88811dc02420 (sb_writers#12){.+.+}-{0:0}, at: mnt_want_write_file+0x60/0x200
 #1: ffff888118f13340 (&type->i_mutex_dir_key#8){++++}-{4:4}, at: vfs_fileattr_set+0x161/0xc90
1 lock held by syz-executor/8770:
 #0: ffffffff8e3476b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
1 lock held by syz-executor/10287:
 #0: ffffffff8e3476b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770
4 locks held by syz.7.634/11260:
4 locks held by dhcpcd-run-hook/11262:
 #0: ffff88812103a918 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140
 #1: ffff888121024588 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880
 #2: ffff88817328a798 (ptlock_ptr(ptdesc)#2){+.+.}-{3:3}, at: __pte_offset_map_lock+0x13d/0x210
 #3: ffffffff8e341b60 (rcu_read_lock){....}-{1:3}, at: page_table_check_set+0x148/0x610
2 locks held by rm/11266:

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

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+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xf90/0xfe0
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 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: 4528 Comm: kworker/u10:15 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
Workqueue: events_unbound cfg80211_wiphy_work
RIP: 0010:check_preemption_disabled+0x1/0xe0
Code: 00 8f e0 8b 48 c7 c6 40 8f e0 8b eb 1c 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 <41> 57 41 56 53 65 8b 05 c7 a6 4b 07 65 8b 0d bc a6 4b 07 f7 c1 ff
RSP: 0018:ffffc90000a08968 EFLAGS: 00000282
RAX: 0000000000000001 RBX: ffffffff81860f06 RCX: ffff888172b13a80
RDX: 00000000b42d3af8 RSI: ffffffff8be08f40 RDI: ffffffff8be08f00
RBP: dffffc0000000000 R08: ffffffff8174a315 R09: ffffffff8e341b60
R10: ffffc90000a08ab8 R11: ffffffff81ae4a90 R12: 1ffff9200014114d
R13: ffffc90000a08aa0 R14: ffffc90000a08a68 R15: ffffffff8174a315
FS:  0000000000000000(0000) GS:ffff8882a9a0b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f4166e95440 CR3: 0000000171670000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 rcu_is_watching+0x15/0xb0
 unwind_next_frame+0xd4/0x23c0
 arch_stack_walk+0x11b/0x150
 stack_trace_save+0xa9/0x100
 save_stack+0x122/0x230
 __reset_page_owner+0x71/0x1f0
 __free_frozen_pages+0xbb0/0xd10
 tlb_remove_table_rcu+0x85/0x100
 rcu_core+0xc9e/0x1750
 handle_softirqs+0x22a/0x7c0
 do_softirq+0x76/0xd0
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0xf8/0x130
 cfg80211_inform_single_bss_data+0x13b9/0x1ab0
 cfg80211_inform_bss_data+0x233/0x3bb0
 cfg80211_inform_bss_frame_data+0x3c7/0x710
 ieee80211_bss_info_update+0x794/0xa40
 ieee80211_ibss_rx_queued_mgmt+0x1901/0x2c80
 ieee80211_iface_work+0x85e/0x12b0
 cfg80211_wiphy_work+0x2ab/0x450
 process_scheduled_works+0xaec/0x17a0
 worker_thread+0x89f/0xd90
 kthread+0x726/0x8b0
 ret_from_fork+0x51b/0xa40
 ret_from_fork_asm+0x1a/0x30
 </TASK>
