unmap_vmas+0x16d/0x2f0 mm/memory.c:1629
 exit_mmap+0x1d0/0x620 mm/mmap.c:3201
 __mmput+0x122/0x470 kernel/fork.c:1101
 mmput+0x58/0x60 kernel/fork.c:1122
 exit_mm kernel/exit.c:501 [inline]
 do_exit+0xae2/0x2a60 kernel/exit.c:812
 do_group_exit+0x125/0x310 kernel/exit.c:922
 __do_sys_exit_group kernel/exit.c:933 [inline]
 __se_sys_exit_group kernel/exit.c:931 [inline]
 __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:931
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
------------[ cut here ]------------
WARNING: CPU: 0 PID: 26555 at mm/huge_memory.c:2327 unmap_page mm/huge_memory.c:2327 [inline]
WARNING: CPU: 0 PID: 26555 at mm/huge_memory.c:2327 split_huge_page_to_list+0x25eb/0x3e60 mm/huge_memory.c:2700
Modules linked in:
CPU: 0 PID: 26555 Comm: syz-executor.4 Not tainted 5.14.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:unmap_page mm/huge_memory.c:2327 [inline]
RIP: 0010:split_huge_page_to_list+0x25eb/0x3e60 mm/huge_memory.c:2700
Code: 89 de e8 98 e4 b6 ff 84 db 0f 85 54 e0 ff ff e8 db dc b6 ff 48 c7 c6 c0 db 97 89 48 89 ef e8 4c 73 e9 ff c6 05 45 e9 99 0b 01 <0f> 0b e9 32 e0 ff ff bb 02 00 00 00 e9 64 ef ff ff e8 af dc b6 ff
RSP: 0018:ffffc90001e077a8 EFLAGS: 00010246
RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc90013142000
RDX: 0000000000040000 RSI: ffffffff81be0194 RDI: 0000000000000003
RBP: ffffea00022c0000 R08: 0000000000000029 R09: 00000000ffffffff
R10: ffffffff88ea766c R11: 00000000ffffffff R12: ffff88814018d2d8
R13: ffffea00022c0008 R14: ffffea00022c0000 R15: 0000000000000000
FS:  00007f122bb82700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055c86feff85f CR3: 000000001bd06000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 split_huge_page include/linux/huge_mm.h:192 [inline]
 deferred_split_scan+0x5fa/0xbd0 mm/huge_memory.c:2860
 do_shrink_slab+0x42d/0xbd0 mm/vmscan.c:712
 shrink_slab+0x17c/0x6e0 mm/vmscan.c:872
 drop_slab_node+0x97/0x130 mm/vmscan.c:906
 drop_slab+0x97/0x130 mm/vmscan.c:916
 drop_caches_sysctl_handler+0xf6/0x110 fs/drop_caches.c:65
 proc_sys_call_handler+0x346/0x630 fs/proc/proc_sysctl.c:586
 call_write_iter include/linux/fs.h:2114 [inline]
 new_sync_write+0x426/0x650 fs/read_write.c:518
 vfs_write+0x75a/0xa40 fs/read_write.c:605
 ksys_write+0x12d/0x250 fs/read_write.c:658
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665f9
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f122bb82188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9
RDX: 0000000000000001 RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffff8b8559f R14: 00007f122bb82300 R15: 0000000000022000