__mmput+0x111/0x3a0 kernel/fork.c:1113
 exit_mm+0x211/0x2f0 kernel/exit.c:507
 do_exit+0x688/0x24f0 kernel/exit.c:819
 do_group_exit+0x168/0x2d0 kernel/exit.c:929
 get_signal+0x1740/0x2120 kernel/signal.c:2830
 arch_do_signal_or_restart+0x9c/0x730 arch/x86/kernel/signal.c:868
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x191/0x220 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x2e/0x70 kernel/entry/common.c:300
------------[ cut here ]------------
kernel BUG at include/linux/page-flags.h:785!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 17681 Comm: syz-executor.4 Not tainted 5.15.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:PageDoubleMap include/linux/page-flags.h:785 [inline]
RIP: 0010:__page_mapcount+0x2b3/0x2d0 mm/util.c:744
Code: e8 02 d3 cc ff 4c 89 ff 48 c7 c6 e0 ce 7a 8a e8 f3 65 04 00 0f 0b e8 ec d2 cc ff 4c 89 ff 48 c7 c6 40 cf 7a 8a e8 dd 65 04 00 <0f> 0b e8 d6 d2 cc ff 4c 89 ff 48 c7 c6 80 cf 7a 8a e8 c7 65 04 00
RSP: 0018:ffffc900027d74a8 EFLAGS: 00010246
RAX: 864bcad2f4eead00 RBX: 00fff0000008001d RCX: 0000000000040000
RDX: ffffc900168d3000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: 0000000000000000 R08: ffffffff81d71595 R09: ffffed10173667b1
R10: ffffed10173667b1 R11: 0000000000000000 R12: 1ffffd40004db001
R13: 00000000ffffea00 R14: dffffc0000000000 R15: ffffea00026d8000
FS:  00007f76055de700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d927000 CR3: 0000000084e71000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 page_mapcount include/linux/mm.h:837 [inline]
 smaps_account+0x72d/0x900 fs/proc/task_mmu.c:466
 smaps_pte_entry fs/proc/task_mmu.c:538 [inline]
 smaps_pte_range+0x6d2/0xf90 fs/proc/task_mmu.c:601
 walk_pmd_range mm/pagewalk.c:128 [inline]
 walk_pud_range mm/pagewalk.c:205 [inline]
 walk_p4d_range mm/pagewalk.c:240 [inline]
 walk_pgd_range mm/pagewalk.c:277 [inline]
 __walk_page_range+0xd64/0x1ad0 mm/pagewalk.c:379
 walk_page_vma+0x3de/0x520 mm/pagewalk.c:530
 smap_gather_stats fs/proc/task_mmu.c:768 [inline]
 show_smaps_rollup+0x50f/0xad0 fs/proc/task_mmu.c:871
 seq_read_iter+0x47e/0xdc0 fs/seq_file.c:230
 seq_read+0x473/0x5e0 fs/seq_file.c:162
 do_loop_readv_writev fs/read_write.c:746 [inline]
 do_iter_read+0x4fe/0x780 fs/read_write.c:788
 vfs_readv fs/read_write.c:906 [inline]
 do_preadv+0x210/0x350 fs/read_write.c:998
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x44/0xd0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f7608089ae9
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:00007f76055de188 EFLAGS: 00000246 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00007f760819d020 RCX: 00007f7608089ae9
RDX: 0000000000000001 RSI: 0000000020000140 RDI: 0000000000000004
RBP: 00007f76080e3f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd3197c33f R14: 00007f76055de300 R15: 0000000000022000
 </TASK>
Modules linked in:
---[ end trace 433153222e9b2e85 ]---
RIP: 0010:PageDoubleMap include/linux/page-flags.h:785 [inline]
RIP: 0010:__page_mapcount+0x2b3/0x2d0 mm/util.c:744
Code: e8 02 d3 cc ff 4c 89 ff 48 c7 c6 e0 ce 7a 8a e8 f3 65 04 00 0f 0b e8 ec d2 cc ff 4c 89 ff 48 c7 c6 40 cf 7a 8a e8 dd 65 04 00 <0f> 0b e8 d6 d2 cc ff 4c 89 ff 48 c7 c6 80 cf 7a 8a e8 c7 65 04 00
RSP: 0018:ffffc900027d74a8 EFLAGS: 00010246
RAX: 864bcad2f4eead00 RBX: 00fff0000008001d RCX: 0000000000040000
RDX: ffffc900168d3000 RSI: 000000000003ffff RDI: 0000000000040000
RBP: 0000000000000000 R08: ffffffff81d71595 R09: ffffed10173667b1
R10: ffffed10173667b1 R11: 0000000000000000 R12: 1ffffd40004db001
R13: 00000000ffffea00 R14: dffffc0000000000 R15: ffffea00026d8000
FS:  00007f76055de700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2d927000 CR3: 0000000084e71000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600