------------[ 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.4.1002/10859
Modules linked in:
CPU: 0 UID: 0 PID: 10859 Comm: syz.4.1002 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+0x64e/0x8e0 mm/rmap.c:528
Code: 8b 40 30 48 39 c3 0f 85 9c 00 00 00 e8 8b 0d a8 ff 48 83 c4 28 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc cc cc cc e8 73 0d a8 ff 90 <0f> 0b 90 e9 2e ff ff ff e8 65 0d a8 ff 90 0f 0b 90 e9 e0 fe ff ff
RSP: 0018:ffffc900045b79a0 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff88802b85a070 RCX: ffffffff82600d97
RDX: ffff8880796c1e80 RSI: ffffffff82600e6d RDI: ffff8880796c1e80
RBP: ffff88807a242440 R08: 0000000000000007 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000000 R12: dffffc0000000000
R13: ffff888031853160 R14: ffff88802b85a080 R15: ffff888031853170
FS:  0000000000000000(0000) GS:ffff888124349000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1c3ce4eddd CR3: 00000000385f2000 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:1175
 mmput+0x67/0x80 kernel/fork.c:1198
 exit_mm kernel/exit.c:581 [inline]
 do_exit+0x819/0x2b60 kernel/exit.c:964
 do_group_exit+0xd5/0x2a0 kernel/exit.c:1118
 __do_sys_exit_group kernel/exit.c:1129 [inline]
 __se_sys_exit_group kernel/exit.c:1127 [inline]
 __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1127
 x64_sys_call+0x102c/0x1530 arch/x86/include/generated/asm/syscalls_64.h:232
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f76f0f9c799
Code: Unable to access opcode bytes at 0x7f76f0f9c76f.
RSP: 002b:00007ffc36c113e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f76f0f9c799
RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007ffc36c1144c R08: 0000000000000000 R09: 00000000000927c0
R10: 0000000000000006 R11: 0000000000000246 R12: 0000000000000064
R13: 00000000000927c0 R14: 000000000005e541 R15: 00007ffc36c114a0
 </TASK>