INFO: task syz.7.696:9696 blocked for more than 143 seconds.
      Not tainted 6.14.0-rc5-syzkaller-00016-g48a5eed9ad58 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.696       state:D stack:24272 pid:9696  tgid:9693  ppid:7280   task_flags:0x400140 flags:0x00004006
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5378 [inline]
 __schedule+0xf43/0x5890 kernel/sched/core.c:6765
 __schedule_loop kernel/sched/core.c:6842 [inline]
 schedule+0xe7/0x350 kernel/sched/core.c:6857
 bit_wait+0x15/0xe0 kernel/sched/wait_bit.c:237
 __wait_on_bit+0x62/0x180 kernel/sched/wait_bit.c:49
 out_of_line_wait_on_bit+0xda/0x110 kernel/sched/wait_bit.c:64
 wait_on_bit include/linux/wait_bit.h:77 [inline]
 netfs_unbuffered_write_iter_locked+0xaa1/0xd30 fs/netfs/direct_write.c:108
 netfs_unbuffered_write_iter+0x413/0x6d0 fs/netfs/direct_write.c:195
 v9fs_file_write_iter+0xbf/0x100 fs/9p/vfs_file.c:404
 do_iter_readv_writev+0x655/0x950 fs/read_write.c:820
 vfs_writev+0x363/0xdd0 fs/read_write.c:1050
 do_pwritev+0x1b1/0x270 fs/read_write.c:1146
 __do_sys_pwritev2 fs/read_write.c:1204 [inline]
 __se_sys_pwritev2 fs/read_write.c:1195 [inline]
 __x64_sys_pwritev2+0xef/0x160 fs/read_write.c:1195
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f53a578d169
RSP: 002b:00007f53a6576038 EFLAGS: 00000246 ORIG_RAX: 0000000000000148
RAX: ffffffffffffffda RBX: 00007f53a59a5fa0 RCX: 00007f53a578d169
RDX: 0000000000000001 RSI: 0000400000000080 RDI: 0000000000000007
RBP: 00007f53a580e2a0 R08: 0000000000000007 R09: 0000000000000004
R10: 0000000000000008 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f53a59a5fa0 R15: 00007ffdd19646c8
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/30:
 #0: ffffffff8e1bccc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #0: ffffffff8e1bccc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8e1bccc0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6746
2 locks held by getty/5584:
 #0: ffff8880318a30a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002fde2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211
2 locks held by kworker/u8:11/6556:
 #0: ffff88801b081148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3213
 #1: ffffc90005507d18 ((work_completion)(&rreq->work)#2){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3214
2 locks held by syz.7.696/9696:
 #0: ffff8880599ae420 (sb_writers#18){.+.+}-{0:0}, at: do_pwritev+0x1b1/0x270 fs/read_write.c:1146
 #1: ffff888057a69498 (&sb->s_type->i_mutex_key#22){++++}-{4:4}, at: netfs_start_io_direct+0x116/0x260 fs/netfs/locking.c:188
3 locks held by dhcpcd-run-hook/11898:
 #0: ffff8880b873ec18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:598
 #1: ffff8880b8728a88 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x2c1/0x8e0 kernel/sched/psi.c:987
 #2: ffff888024909498 (ptlock_ptr(ptdesc)#2){+.+.}-{3:3}, at: spin_lock include/linux/spinlock.h:351 [inline]
 #2: ffff888024909498 (ptlock_ptr(ptdesc)#2){+.+.}-{3:3}, at: __pte_offset_map_lock+0xf1/0x300 mm/pgtable-generic.c:402

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.14.0-rc5-syzkaller-00016-g48a5eed9ad58 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:236 [inline]
 watchdog+0xf62/0x12b0 kernel/hung_task.c:399
 kthread+0x3af/0x750 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 11910 Comm: rm Not tainted 6.14.0-rc5-syzkaller-00016-g48a5eed9ad58 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x70 kernel/kcov.c:210
Code: 7e 60 e8 a3 ff ff ff 31 c0 c3 cc cc cc cc 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 90 <f3> 0f 1e fa 65 48 8b 15 74 f7 49 7e 65 8b 05 75 f7 49 7e a9 00 01
RSP: 0018:ffffc9000511f3a0 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88803277a800 RCX: ffffffff8b507e28
RDX: ffff88807eef0000 RSI: 0000000000000003 RDI: 0000000000000005
RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000003
R10: 0000000000000003 R11: 0000000000000002 R12: ffff888079e24640
R13: 0000000000000000 R14: 0000000000000001 R15: 00007fe16f5fafff
FS:  0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe16f425ba8 CR3: 000000007ef30000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 ma_slots lib/maple_tree.c:777 [inline]
 mas_get_slot lib/maple_tree.c:7024 [inline]
 mas_validate_gaps lib/maple_tree.c:7295 [inline]
 mt_validate+0x27f5/0x41e0 lib/maple_tree.c:7568
 validate_mm+0xb1/0x530 mm/vma.c:584
 __split_vma+0xc09/0x1160 mm/vma.c:513
 vms_gather_munmap_vmas+0x1c3/0x1730 mm/vma.c:1268
 __mmap_prepare mm/vma.c:2242 [inline]
 __mmap_region+0x328/0x2760 mm/vma.c:2444
 mmap_region+0x1ab/0x3f0 mm/vma.c:2535
 do_mmap+0xd8d/0x11b0 mm/mmap.c:561
 vm_mmap_pgoff+0x203/0x3a0 mm/util.c:575
 ksys_mmap_pgoff+0x32c/0x5c0 mm/mmap.c:607
 __do_sys_mmap arch/x86/kernel/sys_x86_64.c:89 [inline]
 __se_sys_mmap arch/x86/kernel/sys_x86_64.c:82 [inline]
 __x64_sys_mmap+0x125/0x190 arch/x86/kernel/sys_x86_64.c:82
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe16f6d2b74
Code: 63 08 44 89 e8 5b 41 5c 41 5d c3 41 89 ca 41 f7 c1 ff 0f 00 00 74 0c c7 05 f5 46 01 00 16 00 00 00 eb 17 b8 09 00 00 00 0f 05 <48> 3d 00 f0 ff ff 76 0c f7 d8 89 05 dc 46 01 00 48 83 c8 ff c3 0f
RSP: 002b:00007ffd2d464948 EFLAGS: 00000246 ORIG_RAX: 0000000000000009
RAX: ffffffffffffffda RBX: 00007ffd2d464988 RCX: 00007fe16f6d2b74
RDX: 0000000000000005 RSI: 000000000002c000 RDI: 00007fe16f3b1000
RBP: 00007ffd2d464ce0 R08: 0000000000000003 R09: 0000000000002000
R10: 0000000000000812 R11: 0000000000000246 R12: 00007fe16f6b0880
R13: 00007ffd2d464d68 R14: 0000000000001fd8 R15: 0000000000000000
 </TASK>