Hello, syzbot found the following issue on: HEAD commit: 7ac3a1c1 Merge tag 'mtd/fixes-for-5.13-rc4' of git://git.k.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14559d5bd00000 kernel config: https://syzkaller.appspot.com/x/.config?x=f9f3fc7daa178986 dashboard link: https://syzkaller.appspot.com/bug?extid=1f52b3a18d5633fa7f82 compiler: Debian clang version 11.0.1-2 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=11132d5bd00000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1f52b3a18d5633fa7f82@xxxxxxxxxxxxxxxxxxxxxxxxx __mmput+0x111/0x370 kernel/fork.c:1096 exit_mm+0x67e/0x7d0 kernel/exit.c:502 do_exit+0x6b9/0x23d0 kernel/exit.c:813 do_group_exit+0x168/0x2d0 kernel/exit.c:923 get_signal+0x1770/0x2180 kernel/signal.c:2835 arch_do_signal_or_restart+0x8e/0x6c0 arch/x86/kernel/signal.c:789 handle_signal_work kernel/entry/common.c:147 [inline] exit_to_user_mode_loop kernel/entry/common.c:171 [inline] exit_to_user_mode_prepare+0xac/0x200 kernel/entry/common.c:208 __syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline] syscall_exit_to_user_mode+0x26/0x70 kernel/entry/common.c:301 ------------[ cut here ]------------ kernel BUG at include/linux/page-flags.h:686! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 10694 Comm: syz-executor.0 Not tainted 5.13.0-rc3-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:PageDoubleMap include/linux/page-flags.h:686 [inline] RIP: 0010:__page_mapcount+0x2b3/0x2d0 mm/util.c:728 Code: e8 72 25 cf ff 4c 89 ff 48 c7 c6 40 fb 39 8a e8 03 4c 04 00 0f 0b e8 5c 25 cf ff 4c 89 ff 48 c7 c6 40 fc 39 8a e8 ed 4b 04 00 <0f> 0b e8 46 25 cf ff 4c 89 ff 48 c7 c6 80 fc 39 8a e8 d7 4b 04 00 RSP: 0018:ffffc90001ff7460 EFLAGS: 00010246 RAX: e8070b6faabf8b00 RBX: 00fff0000008001d RCX: ffff888047280000 RDX: 0000000000000000 RSI: 000000000000ffff RDI: 000000000000ffff RBP: 0000000000000000 R08: ffffffff81ce2584 R09: ffffed1017363f24 R10: ffffed1017363f24 R11: 0000000000000000 R12: 1ffffd4000265001 R13: 00000000ffffffff R14: dffffc0000000000 R15: ffffea0001328000 FS: 00007f6e83636700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000568000 CR3: 000000002b559000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: page_mapcount include/linux/mm.h:873 [inline] smaps_account+0x79d/0x980 fs/proc/task_mmu.c:467 smaps_pte_entry fs/proc/task_mmu.c:533 [inline] smaps_pte_range+0x6ed/0xfc0 fs/proc/task_mmu.c:596 walk_pmd_range mm/pagewalk.c:89 [inline] walk_pud_range mm/pagewalk.c:160 [inline] walk_p4d_range mm/pagewalk.c:193 [inline] walk_pgd_range mm/pagewalk.c:229 [inline] __walk_page_range+0xd64/0x1ad0 mm/pagewalk.c:331 walk_page_vma+0x3c2/0x500 mm/pagewalk.c:482 smap_gather_stats fs/proc/task_mmu.c:769 [inline] show_smaps_rollup+0x49d/0xc20 fs/proc/task_mmu.c:872 seq_read_iter+0x43a/0xcf0 fs/seq_file.c:227 seq_read+0x445/0x5c0 fs/seq_file.c:159 do_loop_readv_writev fs/read_write.c:761 [inline] do_iter_read+0x464/0x660 fs/read_write.c:803 vfs_readv fs/read_write.c:921 [inline] do_preadv+0x1f7/0x340 fs/read_write.c:1013 do_syscall_64+0x3f/0xb0 arch/x86/entry/common.c:47 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665d9 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:00007f6e83636188 EFLAGS: 00000246 ORIG_RAX: 0000000000000127 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9 RDX: 0000000000000001 RSI: 0000000020000780 RDI: 0000000000000004 RBP: 00000000004bfcb9 R08: 0000000000000003 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffeb607b5df R14: 00007f6e83636300 R15: 0000000000022000 Modules linked in: ---[ end trace e65a33e7d2bffb07 ]--- RIP: 0010:PageDoubleMap include/linux/page-flags.h:686 [inline] RIP: 0010:__page_mapcount+0x2b3/0x2d0 mm/util.c:728 Code: e8 72 25 cf ff 4c 89 ff 48 c7 c6 40 fb 39 8a e8 03 4c 04 00 0f 0b e8 5c 25 cf ff 4c 89 ff 48 c7 c6 40 fc 39 8a e8 ed 4b 04 00 <0f> 0b e8 46 25 cf ff 4c 89 ff 48 c7 c6 80 fc 39 8a e8 d7 4b 04 00 RSP: 0018:ffffc90001ff7460 EFLAGS: 00010246 RAX: e8070b6faabf8b00 RBX: 00fff0000008001d RCX: ffff888047280000 RDX: 0000000000000000 RSI: 000000000000ffff RDI: 000000000000ffff RBP: 0000000000000000 R08: ffffffff81ce2584 R09: ffffed1017363f24 R10: ffffed1017363f24 R11: 0000000000000000 R12: 1ffffd4000265001 R13: 00000000ffffffff R14: dffffc0000000000 R15: ffffea0001328000 FS: 00007f6e83636700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000568000 CR3: 000000002b559000 CR4: 00000000001506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- This report is generated by a bot. 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