__get_user_pages_locked mm/gup.c:1345 [inline] __get_user_pages_remote+0x18f/0x840 mm/gup.c:1989 pin_user_pages_remote+0x63/0x90 mm/gup.c:3061 process_vm_rw_single_vec mm/process_vm_access.c:105 [inline] process_vm_rw_core.constprop.0+0x445/0x990 mm/process_vm_access.c:215 process_vm_rw+0x29c/0x300 mm/process_vm_access.c:283 __do_sys_process_vm_writev mm/process_vm_access.c:303 [inline] __se_sys_process_vm_writev mm/process_vm_access.c:298 [inline] __x64_sys_process_vm_writev+0xdf/0x1b0 mm/process_vm_access.c:298 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 page_owner free stack trace missing ------------[ cut here ]------------ kernel BUG at include/linux/page-flags.h:785! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 14687 Comm: syz-executor.4 Not tainted 5.15.0-rc7-next-20211029-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 c3 22 d1 ff 48 c7 c6 80 fc 75 89 48 89 ef e8 64 50 04 00 0f 0b e8 ad 22 d1 ff 48 c7 c6 20 fd 75 89 48 89 ef e8 4e 50 04 00 <0f> 0b e8 97 22 d1 ff 48 c7 c6 60 fd 75 89 4c 89 f7 e8 38 50 04 00 RSP: 0018:ffffc9000431f590 EFLAGS: 00010246 RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc900120fc000 RDX: 0000000000040000 RSI: ffffffff81a6a992 RDI: 0000000000000003 RBP: ffffea0002522e00 R08: 0000000000000023 R09: 00000000ffffffff R10: ffffffff88d7d271 R11: 00000000ffffffff R12: 00000000ffffffff R13: 00000000ffffea00 R14: ffffc9000431f948 R15: ffffea0002520001 FS: 00007f4fca7f8700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31b23000 CR3: 0000000030b66000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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: 0033:0x7f4fcd2a3ae9 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:00007f4fca7f8188 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 00007f4fcd3b7020 RCX: 00007f4fcd2a3ae9 RDX: 0000000000000001 RSI: 0000000020000140 RDI: 0000000000000004 RBP: 00007f4fcd2fdf25 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffce335a8ef R14: 00007f4fca7f8300 R15: 0000000000022000 Modules linked in: ---[ end trace 01256222d67189ac ]--- RIP: 0010:PageDoubleMap include/linux/page-flags.h:785 [inline] RIP: 0010:__page_mapcount+0x2d2/0x350 mm/util.c:744 Code: e8 c3 22 d1 ff 48 c7 c6 80 fc 75 89 48 89 ef e8 64 50 04 00 0f 0b e8 ad 22 d1 ff 48 c7 c6 20 fd 75 89 48 89 ef e8 4e 50 04 00 <0f> 0b e8 97 22 d1 ff 48 c7 c6 60 fd 75 89 4c 89 f7 e8 38 50 04 00 RSP: 0018:ffffc9000431f590 EFLAGS: 00010246 RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc900120fc000 RDX: 0000000000040000 RSI: ffffffff81a6a992 RDI: 0000000000000003 RBP: ffffea0002522e00 R08: 0000000000000023 R09: 00000000ffffffff R10: ffffffff88d7d271 R11: 00000000ffffffff R12: 00000000ffffffff R13: 00000000ffffea00 R14: ffffc9000431f948 R15: ffffea0002520001 FS: 00007f4fca7f8700(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31b23000 CR3: 0000000030b66000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400