------------[ cut here ]------------
anon_vma->num_active_vmas
WARNING: mm/rmap.c:528 at unlink_anon_vmas+0x64e/0x8e0 mm/rmap.c:528, CPU#0: syz.3.848/10105
Modules linked in:
CPU: 0 UID: 0 PID: 10105 Comm: syz.3.848 Tainted: G     U              syzkaller #0 PREEMPT(full) 
Tainted: [U]=USER
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:unlink_anon_vmas+0x64e/0x8e0 mm/rmap.c:528
Code: 8b 40 30 48 39 c3 0f 85 9c 00 00 00 e8 fb 36 a8 ff 48 83 c4 28 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc e8 e3 36 a8 ff 90 <0f> 0b 90 e9 2e ff ff ff e8 d5 36 a8 ff 90 0f 0b 90 e9 e0 fe ff ff
RSP: 0000:ffffc9000cdf7758 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88807e059e00 RCX: ffffffff825fc2e7
RDX: ffff8880375cdac0 RSI: ffffffff825fc3bd RDI: ffff8880375cdac0
RBP: ffff8880318b8550 R08: 0000000000000007 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000000 R12: dffffc0000000000
R13: ffff88807a1e12a0 R14: ffff88807e059e10 R15: ffff88807a1e12b0
FS:  0000000000000000(0000) GS:ffff88812434e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30c1dff8 CR3: 000000007e760000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 free_pgtables+0x2e7/0xd80 mm/memory.c:427
 exit_mmap+0x44c/0xa30 mm/mmap.c:1314
 __mmput+0x12a/0x410 kernel/fork.c:1174
 mmput+0x67/0x80 kernel/fork.c:1197
 exit_mm kernel/exit.c:581 [inline]
 do_exit+0x78a/0x2aa0 kernel/exit.c:959
 do_group_exit+0xd5/0x2a0 kernel/exit.c:1112
 get_signal+0x1ec7/0x21e0 kernel/signal.c:3034
 arch_do_signal_or_restart+0x91/0x770 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
 exit_to_user_mode_loop+0x86/0x4a0 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+0x668/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fecadd9c799
Code: Unable to access opcode bytes at 0x7fecadd9c76f.
RSP: 002b:00007fecaec0d0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007fecae016098 RCX: 00007fecadd9c799
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007fecae016098
RBP: 00007fecae016090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fecae016128 R14: 00007fffe797a2d0 R15: 00007fffe797a3b8
 </TASK>