INFO: task syz.3.16:2908 blocked for more than 143 seconds.
      Not tainted 6.16.0-rc5-syzkaller #0
      Blocked by coredump.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.16        state:D stack:13584 pid:2908  tgid:2908  ppid:2454   task_flags:0x40004c flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5397 [inline]
 __schedule+0x76d/0xc30 kernel/sched/core.c:6786
 __schedule_loop kernel/sched/core.c:6864 [inline]
 schedule+0xac/0x140 kernel/sched/core.c:6879
 schedule_preempt_disabled+0x32/0x60 kernel/sched/core.c:6936
 rwsem_down_read_slowpath+0x241/0x520 kernel/locking/rwsem.c:1084
 __down_read_common kernel/locking/rwsem.c:1248 [inline]
 __down_read kernel/locking/rwsem.c:1261 [inline]
 down_read+0x86/0xf0 kernel/locking/rwsem.c:1526
 mmap_read_lock include/linux/mmap_lock.h:412 [inline]
 exit_mm+0x3f/0x110 kernel/exit.c:557
 do_exit+0x1c6/0x9a0 kernel/exit.c:952
 do_group_exit+0x9f/0xa0 kernel/exit.c:1105
 __do_sys_exit_group kernel/exit.c:1116 [inline]
 __se_sys_exit_group kernel/exit.c:1114 [inline]
 __x64_sys_exit_group+0x12/0x20 kernel/exit.c:1114
 x64_sys_call+0x21ba/0x21c0 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x8f/0x250 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f433077e9a9
RSP: 002b:00007fff91d11a48 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f433077e9a9
RDX: 00007f433077e9a9 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000003 R08: 0000000291d11b3f R09: 00007f4330970260
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4330970260 R14: 0000000000000003 R15: 00007fff91d11b00
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/31:
 #0: ffffffff8277aab0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #0: ffffffff8277aab0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
 #0: ffffffff8277aab0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x2e/0x100 kernel/locking/lockdep.c:6770
2 locks held by getty/857:
 #0: ffff888100a9f0a0 (&tty->ldisc_sem){....}-{0:0}, at: tty_ldisc_ref_wait+0x20/0x40 drivers/tty/tty_ldisc.c:243
 #1: ffffc90001bdb2f0 (&ldata->atomic_read_lock){....}-{3:3}, at: n_tty_read+0x1c3/0x6e0 drivers/tty/n_tty.c:2222
1 lock held by syz.3.16/2908:
 #0: ffff888101b542a0 (&mm->mmap_lock){....}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:412 [inline]
 #0: ffff888101b542a0 (&mm->mmap_lock){....}-{3:3}, at: exit_mm+0x3f/0x110 kernel/exit.c:557
1 lock held by syz.3.16/2909:
1 lock held by syz.4.17/3366:
 #0: ffff88810fab5520 (&mm->mmap_lock){....}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:412 [inline]
 #0: ffff88810fab5520 (&mm->mmap_lock){....}-{3:3}, at: exit_mm+0x3f/0x110 kernel/exit.c:557
1 lock held by syz.4.17/3367:
1 lock held by syz.5.18/3824:
 #0: ffff88810fab1460 (&mm->mmap_lock){....}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:412 [inline]
 #0: ffff88810fab1460 (&mm->mmap_lock){....}-{3:3}, at: exit_mm+0x3f/0x110 kernel/exit.c:557
1 lock held by syz.5.18/3826:
1 lock held by syz.6.19/4284:
 #0: ffff88810fab3960 (&mm->mmap_lock){....}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:412 [inline]
 #0: ffff88810fab3960 (&mm->mmap_lock){....}-{3:3}, at: exit_mm+0x3f/0x110 kernel/exit.c:557
1 lock held by syz.6.19/4285:
1 lock held by syz.7.20/4743:
 #0: ffff888101b53960 (&mm->mmap_lock){....}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:412 [inline]
 #0: ffff888101b53960 (&mm->mmap_lock){....}-{3:3}, at: exit_mm+0x3f/0x110 kernel/exit.c:557
1 lock held by syz.7.20/4744:
1 lock held by syz.8.21/5201:
 #0: ffff88810fab26e0 (&mm->mmap_lock){....}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:412 [inline]
 #0: ffff88810fab26e0 (&mm->mmap_lock){....}-{3:3}, at: exit_mm+0x3f/0x110 kernel/exit.c:557
1 lock held by syz.8.21/5203:
1 lock held by syz.9.22/5660:
 #0: ffff88810fab4be0 (&mm->mmap_lock){....}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:412 [inline]
 #0: ffff88810fab4be0 (&mm->mmap_lock){....}-{3:3}, at: exit_mm+0x3f/0x110 kernel/exit.c:557
1 lock held by syz.9.22/5661:

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-rc5-syzkaller #0 PREEMPT(none) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0xa2/0xf0 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x109/0x170 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x8e/0x140 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline]
 watchdog+0x604/0x630 kernel/hung_task.c:470
 kthread+0x200/0x230 kernel/kthread.c:464
 ret_from_fork+0x9d/0x170 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 4744 Comm: syz.7.20 Not tainted 6.16.0-rc5-syzkaller #0 PREEMPT(none) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:arch_atomic_inc lib/maple_tree.c:7561 [inline]
RIP: 0010:raw_atomic_inc include/linux/atomic/atomic-arch-fallback.h:992 [inline]
RIP: 0010:atomic_inc include/linux/atomic/atomic-instrumented.h:436 [inline]
RIP: 0010:mt_validate_nulls lib/maple_tree.c:7565 [inline]
RIP: 0010:mt_validate+0x15a1/0x1750 lib/maple_tree.c:7615
Code: ff ff 48 8b 84 24 d8 00 00 00 48 89 44 24 10 45 31 f6 4c 89 e8 41 0f b6 d6 4c 8b 6c d5 00 4c 09 e8 74 6b f0 ff 05 7f d1 0a 05 <f0> ff 05 7c d1 0a 05 4c 89 f8 c1 e8 03 83 e0 0f 8d 48 ff 83 f9 02
RSP: 0018:ffffc90001b378f0 EFLAGS: 00000282
RAX: ffff88810c7fab00 RBX: ffff88810cb28800 RCX: 0000000000000000
RDX: 0000000000000001 RSI: 000000000000000e RDI: ffffc90001b379a0
RBP: ffff88810cb28880 R08: ffff88810cb2880c R09: 00001ff9691befff
R10: 000000000000000f R11: 0000000000000000 R12: ffffffffffffff00
R13: ffff88810c7fab00 R14: 0000000000000001 R15: ffff88810cb2880c
FS:  00007fd5f9bf76c0(0000) GS:ffff8882b4d3b000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0b261a4e9c CR3: 000000011178c000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 validate_mm+0x81/0x260 mm/vma.c:651
 vma_link+0x183/0x1c0 mm/vma.c:1801
 copy_vma+0x2a8/0x390 mm/vma.c:1882
 copy_vma_and_data mm/mremap.c:1184 [inline]
 move_vma+0x198/0x540 mm/mremap.c:1282
 mremap_to+0x1b2/0x1e0 mm/mremap.c:1406
 remap_move mm/mremap.c:1863 [inline]
 do_mremap mm/mremap.c:1906 [inline]
 __do_sys_mremap mm/mremap.c:1970 [inline]
 __se_sys_mremap+0x68d/0x7d0 mm/mremap.c:1938
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x8f/0x250 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd5fa18e9a9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd5f9bf7038 EFLAGS: 00000246 ORIG_RAX: 0000000000000019
RAX: ffffffffffffffda RBX: 00007fd5fa3b5fa0 RCX: 00007fd5fa18e9a9
RDX: 0000000000001000 RSI: 0000000000001000 RDI: 0000200000000000
RBP: 00007fd5fa210d69 R08: 0000200000481000 R09: 0000000000000000
R10: 0000000000000007 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fd5fa3b5fa0 R15: 00007ffd965dd2d8
 </TASK>