R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001
R13: 00007f5463866038 R14: 00007f5463865fa0 R15: 00007ffc410d4d38
 </TASK>
------------[ cut here ]------------
anon_vma->num_active_vmas
WARNING: mm/rmap.c:528 at unlink_anon_vmas+0x6c5/0x730 mm/rmap.c:528, CPU#1: syz.1.138/6379
Modules linked in:
CPU: 1 UID: 0 PID: 6379 Comm: syz.1.138 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:unlink_anon_vmas+0x6c5/0x730 mm/rmap.c:528
Code: 08 00 48 3b 6c 24 18 74 29 e8 27 a8 ad ff 49 89 ee e9 cf fd ff ff e8 1a a8 ad ff 90 0f 0b 90 e9 4d fe ff ff e8 0c a8 ad ff 90 <0f> 0b 90 e9 81 fe ff ff e8 fe a7 ad ff eb 05 e8 f7 a7 ad ff 48 83
RSP: 0018:ffffc90008f07648 EFLAGS: 00010293
RAX: ffffffff8216aad4 RBX: ffff888033155600 RCX: ffff8880285f8000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88803eb4a3f0 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1ed44b7 R12: ffffffffffffffff
R13: 1ffff110065e25b4 R14: ffff888032f12da0 R15: ffff888033155600
FS:  0000000000000000(0000) GS:ffff888126443000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffeb0677bf8 CR3: 000000003814e000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 free_pgtables+0x836/0xb70 mm/memory.c:427
 exit_mmap+0x490/0xa10 mm/mmap.c:1314
 __mmput+0xcb/0x3d0 kernel/fork.c:1174
 exit_mm+0x168/0x220 kernel/exit.c:581
 do_exit+0x62e/0x2320 kernel/exit.c:959
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1112
 get_signal+0x125c/0x1310 kernel/signal.c:3034
 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop+0x86/0x480 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:226 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:256 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:325 [inline]
 do_syscall_64+0x32d/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f54635ec629
Code: Unable to access opcode bytes at 0x7f54635ec5ff.
RSP: 002b:00007f54618460e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f5463865fa8 RCX: 00007f54635ec629
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f5463865fa8
RBP: 00007f5463865fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5463866038 R14: 00007ffc410d4c50 R15: 00007ffc410d4d38
 </TASK>