Hello, syzbot found the following crash on: HEAD commit: 1a323ea5 x86: get rid of 'errret' argument to __get_user_x.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=132e940be00000 kernel config: https://syzkaller.appspot.com/x/.config?x=8c1e98458335a7d1 dashboard link: https://syzkaller.appspot.com/bug?extid=d6ec23007e951dadf3de compiler: gcc (GCC) 9.0.0 20181231 (experimental) syz repro: https://syzkaller.appspot.com/x/repro.syz?x=12921933e00000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=172e940be00000 The bug was bisected to: commit e950564b97fd0f541b02eb207685d0746f5ecf29 Author: Miklos Szeredi <mszeredi@xxxxxxxxxx> Date: Tue Jul 24 13:01:55 2018 +0000 vfs: don't evict uninitialized inode bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=115cad33e00000 final crash: https://syzkaller.appspot.com/x/report.txt?x=135cad33e00000 console output: https://syzkaller.appspot.com/x/log.txt?x=155cad33e00000 IMPORTANT: if you fix the bug, please add the following tag to the commit: Reported-by: syzbot+d6ec23007e951dadf3de@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: e950564b97fd ("vfs: don't evict uninitialized inode") overlayfs: upper fs does not support xattr, falling back to index=off and metacopy=off. ------------[ cut here ]------------ kernel BUG at mm/hugetlb.c:3416! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 0 PID: 7036 Comm: syz-executor110 Not tainted 5.6.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:__unmap_hugepage_range+0xa26/0xbc0 mm/hugetlb.c:3416 Code: 00 48 c7 c7 60 37 35 88 e8 57 b4 a2 ff e9 b3 fd ff ff e8 cd 90 c6 ff 0f 0b e9 c4 f7 ff ff e8 c1 90 c6 ff 0f 0b e8 ba 90 c6 ff <0f> 0b e8 b3 90 c6 ff 83 8c 24 c0 00 00 00 01 48 8d bc 24 a0 00 00 RSP: 0018:ffffc900017779b0 EFLAGS: 00010293 RAX: ffff88808cf5c2c0 RBX: ffffffff8c641c08 RCX: ffffffff81ac50b4 RDX: 0000000000000000 RSI: ffffffff81ac58a6 RDI: 0000000000000007 RBP: 0000000020000000 R08: ffff88808cf5c2c0 R09: ffffed10129d8111 R10: ffffed10129d8110 R11: ffff888094ec0887 R12: 0000000000003000 R13: 0000000000000000 R14: 0000000020003000 R15: 0000000000200000 FS: 00000000013c0880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000140 CR3: 0000000093554000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __unmap_hugepage_range_final+0x30/0x70 mm/hugetlb.c:3507 unmap_single_vma+0x238/0x300 mm/memory.c:1296 unmap_vmas+0x16f/0x2f0 mm/memory.c:1332 exit_mmap+0x2aa/0x510 mm/mmap.c:3126 __mmput kernel/fork.c:1082 [inline] mmput+0x168/0x4b0 kernel/fork.c:1103 exit_mm kernel/exit.c:477 [inline] do_exit+0xa51/0x2dd0 kernel/exit.c:780 do_group_exit+0x125/0x340 kernel/exit.c:891 __do_sys_exit_group kernel/exit.c:902 [inline] __se_sys_exit_group kernel/exit.c:900 [inline] __x64_sys_exit_group+0x3a/0x50 kernel/exit.c:900 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295 entry_SYSCALL_64_after_hwframe+0x49/0xb3 RIP: 0033:0x43efe8 Code: Bad RIP value. RSP: 002b:00007ffdfe6c00f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043efe8 RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 RBP: 00000000004be7e8 R08: 00000000000000e7 R09: ffffffffffffffd0 R10: 0000040000000011 R11: 0000000000000246 R12: 0000000000000001 R13: 00000000006d0180 R14: 0000000000000000 R15: 0000000000000000 Modules linked in: ---[ end trace 2d36245d65cb52f7 ]--- RIP: 0010:__unmap_hugepage_range+0xa26/0xbc0 mm/hugetlb.c:3416 Code: 00 48 c7 c7 60 37 35 88 e8 57 b4 a2 ff e9 b3 fd ff ff e8 cd 90 c6 ff 0f 0b e9 c4 f7 ff ff e8 c1 90 c6 ff 0f 0b e8 ba 90 c6 ff <0f> 0b e8 b3 90 c6 ff 83 8c 24 c0 00 00 00 01 48 8d bc 24 a0 00 00 RSP: 0018:ffffc900017779b0 EFLAGS: 00010293 RAX: ffff88808cf5c2c0 RBX: ffffffff8c641c08 RCX: ffffffff81ac50b4 RDX: 0000000000000000 RSI: ffffffff81ac58a6 RDI: 0000000000000007 RBP: 0000000020000000 R08: ffff88808cf5c2c0 R09: ffffed10129d8111 R10: ffffed10129d8110 R11: ffff888094ec0887 R12: 0000000000003000 R13: 0000000000000000 R14: 0000000020003000 R15: 0000000000200000 FS: 00000000013c0880(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8cc24dd000 CR3: 0000000093554000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 --- This bug is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this bug report. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. For information about bisection process see: https://goo.gl/tpsmEJ#bisection syzbot can test patches for this bug, for details see: https://goo.gl/tpsmEJ#testing-patches
