------------[ 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.7.8464/20435
Modules linked in:
CPU: 1 UID: 0 PID: 20435 Comm: syz.7.8464 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
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 07 30 aa ff 49 89 ee e9 cf fd ff ff e8 fa 2f aa ff 90 0f 0b 90 e9 4d fe ff ff e8 ec 2f aa ff 90 <0f> 0b 90 e9 81 fe ff ff e8 de 2f aa ff eb 05 e8 d7 2f aa ff 48 83
RSP: 0018:ffffc90003aa7648 EFLAGS: 00010293
RAX: ffffffff821b7114 RBX: ffff88806422daa0 RCX: ffff88809af7db80
RDX: 0000000000000000 RSI: ffffffffffffffff RDI: 0000000000000000
RBP: ffff88807dad53f0 R08: ffff88806422daaf R09: 1ffff1100c845b55
R10: dffffc0000000000 R11: ffffed100c845b56 R12: ffffffffffffffff
R13: 1ffff1100621296e R14: ffff888031094b70 R15: ffff88806422daa0
FS:  0000000000000000(0000) GS:ffff88812555d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6b6524eddd CR3: 00000000a4516000 CR4: 00000000003526f0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 free_pgtables+0x836/0xb70 mm/memory.c:427
 exit_mmap+0x490/0xa10 mm/mmap.c:1314
 __mmput+0x118/0x430 kernel/fork.c:1175
 exit_mm+0x168/0x220 kernel/exit.c:581
 do_exit+0x6a2/0x23c0 kernel/exit.c:964
 do_group_exit+0x21b/0x2d0 kernel/exit.c:1118
 get_signal+0x1284/0x1330 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: 0033:0x7f6b6519c799
Code: Unable to access opcode bytes at 0x7f6b6519c76f.
RSP: 002b:00007f6b65fb50e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f6b65415fa8 RCX: 00007f6b6519c799
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f6b65415fa8
RBP: 00007f6b65415fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6b65416038 R14: 00007f6b6553f960 R15: 00007f6b6553fa48
 </TASK>