do_group_exit+0x125/0x310 kernel/exit.c:929
 get_signal+0x47d/0x21d0 kernel/signal.c:2820
 arch_do_signal_or_restart+0x2a9/0x1c40 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+0x17d/0x290 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
------------[ cut here ]------------
kernel BUG at include/linux/page-flags.h:785!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 6009 Comm: syz-executor.0 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+0x2d2/0x350 mm/util.c:744
Code: e8 e3 20 d1 ff 48 c7 c6 40 fe 95 89 48 89 ef e8 34 4e 04 00 0f 0b e8 cd 20 d1 ff 48 c7 c6 e0 fe 95 89 48 89 ef e8 1e 4e 04 00 <0f> 0b e8 b7 20 d1 ff 48 c7 c6 20 ff 95 89 4c 89 f7 e8 08 4e 04 00
RSP: 0018:ffffc9000ed37590 EFLAGS: 00010246
RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc90002d95000
RDX: 0000000000040000 RSI: ffffffff81a6a2e2 RDI: 0000000000000003
RBP: ffffea00027d02c0 R08: 0000000000000024 R09: 00000000ffffffff
R10: ffffffff88f8525c R11: 00000000ffffffff R12: 00000000ffffffff
R13: 00000000ffffea00 R14: ffffc9000ed37948 R15: ffffea00027d0001
FS:  00007f72f804d700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000004 CR3: 0000000091afd000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 page_mapcount include/linux/mm.h:837 [inline]
 smaps_account+0x53c/0x9f0 fs/proc/task_mmu.c:466
 smaps_pte_entry fs/proc/task_mmu.c:538 [inline]
 smaps_pte_range+0x611/0x1250 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+0xe23/0x1ea0 mm/pagewalk.c:379
 walk_page_vma+0x277/0x350 mm/pagewalk.c:530
 smap_gather_stats.part.0+0x148/0x260 fs/proc/task_mmu.c:768
 smap_gather_stats fs/proc/task_mmu.c:741 [inline]
 show_smaps_rollup+0x314/0x9b0 fs/proc/task_mmu.c:871
 seq_read_iter+0x4f6/0x1240 fs/seq_file.c:230
 seq_read+0x3e0/0x5b0 fs/seq_file.c:162
 do_loop_readv_writev fs/read_write.c:746 [inline]
 do_loop_readv_writev fs/read_write.c:733 [inline]
 do_iter_read+0x501/0x760 fs/read_write.c:788
 vfs_readv+0xe5/0x150 fs/read_write.c:906
 do_preadv fs/read_write.c:998 [inline]
 __do_sys_preadv fs/read_write.c:1048 [inline]
 __se_sys_preadv fs/read_write.c:1043 [inline]
 __x64_sys_preadv+0x231/0x310 fs/read_write.c:1043
 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: 0033:0x7f72faaf8ae9
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:00007f72f804d188 EFLAGS: 00000246 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00007f72fac0c020 RCX: 00007f72faaf8ae9
RDX: 0000000000000001 RSI: 0000000020000140 RDI: 0000000000000004
RBP: 00007f72fab52f6d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f72fb13fb2f R14: 00007f72f804d300 R15: 0000000000022000
 </TASK>
Modules linked in:
---[ end trace cdc75773a7606e9f ]---
RIP: 0010:PageDoubleMap include/linux/page-flags.h:785 [inline]
RIP: 0010:__page_mapcount+0x2d2/0x350 mm/util.c:744
Code: e8 e3 20 d1 ff 48 c7 c6 40 fe 95 89 48 89 ef e8 34 4e 04 00 0f 0b e8 cd 20 d1 ff 48 c7 c6 e0 fe 95 89 48 89 ef e8 1e 4e 04 00 <0f> 0b e8 b7 20 d1 ff 48 c7 c6 20 ff 95 89 4c 89 f7 e8 08 4e 04 00
RSP: 0018:ffffc9000ed37590 EFLAGS: 00010246
RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc90002d95000
RDX: 0000000000040000 RSI: ffffffff81a6a2e2 RDI: 0000000000000003
RBP: ffffea00027d02c0 R08: 0000000000000024 R09: 00000000ffffffff
R10: ffffffff88f8525c R11: 00000000ffffffff R12: 00000000ffffffff
R13: 00000000ffffea00 R14: ffffc9000ed37948 R15: ffffea00027d0001
FS:  00007f72f804d700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000004 CR3: 0000000091afd000 CR4: 00000000003506f0