unmap_vmas+0x16b/0x2f0 mm/memory.c:1615 exit_mmap+0x1d0/0x630 mm/mmap.c:3171 __mmput+0x122/0x4b0 kernel/fork.c:1164 mmput+0x56/0x60 kernel/fork.c:1185 exit_mm kernel/exit.c:507 [inline] do_exit+0xb29/0x2b40 kernel/exit.c:819 do_group_exit+0x125/0x310 kernel/exit.c:929 get_signal+0x47d/0x2160 kernel/signal.c:2833 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:863 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:776! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 30994 Comm: syz-executor.0 Not tainted 5.15.0-rc5-next-20211018-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:PageDoubleMap include/linux/page-flags.h:776 [inline] RIP: 0010:__page_mapcount+0x2d2/0x350 mm/util.c:744 Code: e8 03 4e d1 ff 48 c7 c6 c0 f0 b5 89 48 89 ef e8 b4 53 04 00 0f 0b e8 ed 4d d1 ff 48 c7 c6 60 f1 b5 89 48 89 ef e8 9e 53 04 00 <0f> 0b e8 d7 4d d1 ff 48 c7 c6 a0 f1 b5 89 4c 89 f7 e8 88 53 04 00 RSP: 0018:ffffc90016c77590 EFLAGS: 00010246 RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc90010d3c000 RDX: 0000000000040000 RSI: ffffffff81a62732 RDI: 0000000000000003 RBP: ffffea0002668000 R08: 0000000000000024 R09: 00000000ffffffff R10: ffffffff890c23a2 R11: 00000000ffffffff R12: 00000000ffffffff R13: 00000000ffffffff R14: ffffc90016c77948 R15: ffffea0002668001 FS: 00007f41a12c1700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000004 CR3: 0000000041606000 CR4: 00000000003526f0 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:750 [inline] do_loop_readv_writev fs/read_write.c:737 [inline] do_iter_read+0x501/0x760 fs/read_write.c:792 vfs_readv+0xe5/0x150 fs/read_write.c:910 do_preadv fs/read_write.c:1002 [inline] __do_sys_preadv fs/read_write.c:1052 [inline] __se_sys_preadv fs/read_write.c:1047 [inline] __x64_sys_preadv+0x231/0x310 fs/read_write.c:1047 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: 0033:0x7f41a3d6ca39 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:00007f41a12c1188 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 00007f41a3e70020 RCX: 00007f41a3d6ca39 RDX: 0000000000000001 RSI: 0000000020000140 RDI: 0000000000000004 RBP: 00007f41a3dc6c5f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffcceb0dcdf R14: 00007f41a12c1300 R15: 0000000000022000 Modules linked in: ---[ end trace 40cb6f1526f9f7d7 ]--- RIP: 0010:PageDoubleMap include/linux/page-flags.h:776 [inline] RIP: 0010:__page_mapcount+0x2d2/0x350 mm/util.c:744 Code: e8 03 4e d1 ff 48 c7 c6 c0 f0 b5 89 48 89 ef e8 b4 53 04 00 0f 0b e8 ed 4d d1 ff 48 c7 c6 60 f1 b5 89 48 89 ef e8 9e 53 04 00 <0f> 0b e8 d7 4d d1 ff 48 c7 c6 a0 f1 b5 89 4c 89 f7 e8 88 53 04 00 RSP: 0018:ffffc90016c77590 EFLAGS: 00010246 RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc90010d3c000 RDX: 0000000000040000 RSI: ffffffff81a62732 RDI: 0000000000000003 RBP: ffffea0002668000 R08: 0000000000000024 R09: 00000000ffffffff R10: ffffffff890c23a2 R11: 00000000ffffffff R12: 00000000ffffffff R13: 00000000ffffffff R14: ffffc90016c77948 R15: ffffea0002668001 FS: 00007f41a12c1700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000004 CR3: 0000000041606000 CR4: 00000000003526f0