INFO: task syz.1.699:12212 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.699       state:D stack:28904 pid:12212 tgid:12206 ppid:11606  task_flags:0x400040 flags:0x00004004
Call Trace:
 <TASK>
 __schedule+0x1798/0x4cc0
 schedule+0x165/0x360
 wb_wait_for_completion+0x15f/0x260
 sync_inodes_sb+0x1bb/0xa10
 __iterate_supers+0x13d/0x290
 ksys_sync+0x94/0x150
 __ia32_sys_sync+0xe/0x20
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa757f8ebe9
RSP: 002b:00007fa758d31038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fa7581c6180 RCX: 00007fa757f8ebe9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fa7581c6180 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa7581c6218 R14: 00007fa7581c6180 R15: 00007ffdffe58b28
 </TASK>

Showing all locks held in the system:
2 locks held by kworker/u9:0/26:
 #0: ffff88801a889148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc900001efba0 ((reaper_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
1 lock held by khungtaskd/34:
 #0: ffffffff8e33c520 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
3 locks held by kworker/u9:3/91:
 #0: ffff88810129f948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9b4/0x17b0
 #1: ffffc9000177fba0 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x9ef/0x17b0
 #2: ffff8880279380e0 (&type->s_umount_key#51){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0
2 locks held by getty/5674:
 #0: ffff88810debd0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc900029062f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400
1 lock held by syz.7.310/8266:
 #0: ffff888027938420 (sb_writers#13){.+.+}-{0:0}, at: vfs_write+0x211/0xb30
2 locks held by syz.1.699/12212:
 #0: ffff8880279380e0 (&type->s_umount_key#51){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
 #1: ffff88803a5b27d0 (&bdi->wb_switch_rwsem){+.+.}-{4:4}, at: sync_inodes_sb+0x19f/0xa10
2 locks held by syz.2.856/13469:
 #0: ffff8880279380e0 (&type->s_umount_key#51){++++}-{4:4}, at: super_lock+0x2a9/0x3b0
 #1: ffff88803a5b27d0 (&bdi->wb_switch_rwsem){+.+.}-{4:4}
, at: sync_inodes_sb+0x19f/0xa10
3 locks held by syz.7.1080/15375:
 #0: ffff888136639f98 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140
 #1: ffff888136624008 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880
 #2: ffff888136624008 (psi_seq){-.-.}-{0:0}, at: psi_task_change+0xd9/0x340
2 locks held by syz.5.1081/15382:
1 lock held by syz.6.1082/15384:
 #0: ffffffff8e341fb8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730
1 lock held by udevadm/15385:

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

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 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+0x189/0x250
 nmi_cpu_backtrace+0x39e/0x3d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 watchdog+0xf60/0xfa0
 kthread+0x711/0x8a0
 ret_from_fork+0x47f/0x820
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 15401 Comm: udevd 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:folio_remove_rmap_ptes+0x2b9/0xfa0
Code: 31 ff e8 4a 66 ae ff 49 83 e6 01 0f 85 4e 0a 00 00 48 89 df be 08 00 00 00 e8 63 62 12 00 48 89 d8 48 c1 e8 03 48 89 44 24 60 <42> 80 3c 20 00 74 08 48 89 df e8 d8 5f 12 00 4c 8b 33 4c 89 f6 48
RSP: 0018:ffffc90002d2f1b8 EFLAGS: 00000a02
RAX: 1ffffd40009b3b58 RBX: ffffea0004d9dac0 RCX: ffffffff8211492d
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffea0004d9dac0
RBP: 0000000000000001 R08: ffffea0004d9dac7 R09: 1ffffd40009b3b58
R10: dffffc0000000000 R11: fffff940009b3b59 R12: dffffc0000000000
R13: ffffea0004d9dac8 R14: 0000000000000000 R15: ffffea0004d9dac0
FS:  00007f40d1130c80(0000) GS:ffff8880b83f1000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f40d0cc2723 CR3: 0000000027976000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 unmap_page_range+0x1f7f/0x4370
 unmap_vmas+0x399/0x580
 exit_mmap+0x240/0xb40
 __mmput+0x118/0x430
 exec_mmap+0x6ac/0x7d0
 begin_new_exec+0x129c/0x2120
 load_elf_binary+0x998/0x2740
 bprm_execve+0x99c/0x1450
 do_execveat_common+0x510/0x6a0
 __x64_sys_execve+0x94/0xb0
 do_syscall_64+0xfa/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f40d0cfcef7
Code: Unable to access opcode bytes at 0x7f40d0cfcecd.
RSP: 002b:00007ffd632c6e88 EFLAGS: 00000246 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 00007f40d1130ae0 RCX: 00007f40d0cfcef7
RDX: 000055f940a3e9b0 RSI: 00007ffd632c6f88 RDI: 00007ffd632c7388
RBP: 0000000000000009 R08: 0000000000000000 R09: 0000000000000002
R10: 0000000000000008 R11: 0000000000000246 R12: 000000000000000e
R13: 000000000000000b R14: 000055f90456df18 R15: 00007ffd632c8c08
 </TASK>
