I'll start looking at this, but adding Peter this may be related to his recent changes. -- Mike Kravetz On 08/03/22 08:32, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: e65c6a46df94 Merge tag 'drm-fixes-2022-07-30' of git://ano.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=139cc282080000 > kernel config: https://syzkaller.appspot.com/x/.config?x=26034e6fe0075dad > dashboard link: https://syzkaller.appspot.com/bug?extid=824e71311e757a9689ff > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > userspace arch: i386 > > Unfortunately, I don't have any reproducer for this issue yet. > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+824e71311e757a9689ff@xxxxxxxxxxxxxxxxxxxxxxxxx > > ------------[ cut here ]------------ > WARNING: CPU: 1 PID: 28745 at include/linux/swapops.h:319 make_pte_marker_entry include/linux/swapops.h:319 [inline] > WARNING: CPU: 1 PID: 28745 at include/linux/swapops.h:319 make_pte_marker include/linux/swapops.h:342 [inline] > WARNING: CPU: 1 PID: 28745 at include/linux/swapops.h:319 hugetlb_change_protection+0xf85/0x1610 mm/hugetlb.c:6392 > Modules linked in: > CPU: 1 PID: 28745 Comm: syz-executor.3 Not tainted 5.19.0-rc8-syzkaller-00146-ge65c6a46df94 #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 > RIP: 0010:make_pte_marker_entry include/linux/swapops.h:319 [inline] > RIP: 0010:make_pte_marker include/linux/swapops.h:342 [inline] > RIP: 0010:hugetlb_change_protection+0xf85/0x1610 mm/hugetlb.c:6392 > Code: e8 d0 5a b7 ff 0f b6 94 24 80 00 00 00 48 8b 84 24 98 00 00 00 84 d2 0f 84 ef 02 00 00 49 89 c4 e9 48 fb ff ff e8 ab 5e b7 ff <0f> 0b 48 b9 00 00 00 00 00 fc ff df 48 89 d8 48 c1 e8 03 80 3c 08 > RSP: 0018:ffffc90014cc7780 EFLAGS: 00010212 > RAX: 000000000000082a RBX: ffff88807750e820 RCX: ffffc90006723000 > RDX: 0000000000040000 RSI: ffffffff81c30c25 RDI: 0000000000000007 > RBP: ffff888074de5ea0 R08: 0000000000000007 R09: 0000000000000000 > R10: 0000000000000004 R11: 0000000000000001 R12: 0000000000000000 > R13: 0000000000000000 R14: 0000000000000004 R15: ffff88801fcc8e00 > FS: 0000000000000000(0000) GS:ffff8880b9b00000(0063) knlGS:00000000f7f06b40 > CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 > CR2: 0000000020000040 CR3: 000000001b84c000 CR4: 00000000003526e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > <TASK> > change_protection+0x96b/0x3ad0 mm/mprotect.c:463 > mwriteprotect_range+0x387/0x5c0 mm/userfaultfd.c:759 > userfaultfd_writeprotect fs/userfaultfd.c:1823 [inline] > userfaultfd_ioctl+0x438/0x4340 fs/userfaultfd.c:1997 > compat_ptr_ioctl+0x67/0x90 fs/ioctl.c:906 > __do_compat_sys_ioctl+0x1c7/0x290 fs/ioctl.c:968 > do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] > __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178 > do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203 > entry_SYSENTER_compat_after_hwframe+0x70/0x82 > RIP: 0023:0xf7f0b549 > Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 > RSP: 002b:00000000f7f065cc EFLAGS: 00000296 ORIG_RAX: 0000000000000036 > RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00000000c018aa06 > RDX: 00000000200000c0 RSI: 0000000000000000 RDI: 0000000000000000 > RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 > </TASK> > ---------------- > Code disassembly (best guess): > 0: 03 74 c0 01 add 0x1(%rax,%rax,8),%esi > 4: 10 05 03 74 b8 01 adc %al,0x1b87403(%rip) # 0x1b8740d > a: 10 06 adc %al,(%rsi) > c: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi > 10: 10 07 adc %al,(%rdi) > 12: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi > 16: 10 08 adc %cl,(%rax) > 18: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi > 1c: 00 00 add %al,(%rax) > 1e: 00 00 add %al,(%rax) > 20: 00 51 52 add %dl,0x52(%rcx) > 23: 55 push %rbp > 24: 89 e5 mov %esp,%ebp > 26: 0f 34 sysenter > 28: cd 80 int $0x80 > * 2a: 5d pop %rbp <-- trapping instruction > 2b: 5a pop %rdx > 2c: 59 pop %rcx > 2d: c3 retq > 2e: 90 nop > 2f: 90 nop > 30: 90 nop > 31: 90 nop > 32: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi > 39: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi > > > --- > This report 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 issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
