syzbot


usb-testing boot error: BUG: unable to handle kernel paging request in follow_page_mask

Status: upstream: reported on 2022/09/06 14:44
Reported-by: syzbot+6b3a1fd733d73b7a14d7@syzkaller.appspotmail.com
Fix commit: 9993a4f989c7 virtio: Revert "virtio: find_vqs() add arg sizes"
Patched on: [ci-qemu-upstream ci-qemu-upstream-386 ci-qemu2-arm32 ci-qemu2-arm64 ci-qemu2-arm64-compat ci-qemu2-arm64-mte ci-upstream-bpf-kasan-gce ci-upstream-bpf-next-kasan-gce ci-upstream-gce-arm64 ci-upstream-gce-leak ci-upstream-kasan-gce ci-upstream-kasan-gce-386 ci-upstream-kasan-gce-root ci-upstream-kasan-gce-selinux-root ci-upstream-kasan-gce-smack-root ci-upstream-kmsan-gce ci-upstream-kmsan-gce-386 ci-upstream-linux-next-kasan-gce-root ci-upstream-net-kasan-gce ci-upstream-net-this-kasan-gce ci2-upstream-fs ci2-upstream-kcsan-gce ci2-upstream-usb], missing on: [ci-qemu2-riscv64]
First crash: 157d, last: 157d

Sample crash report:
BUG: unable to handle page fault for address: ffffeefda00001ff
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 0 P4D 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 687 Comm: kworker/u4:0 Not tainted 6.0.0-rc1-syzkaller-00049-g4e55e22d3d9a #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
RIP: 0010:native_pud_val arch/x86/include/asm/pgtable_types.h:347 [inline]
RIP: 0010:pud_none arch/x86/include/asm/pgtable.h:829 [inline]
RIP: 0010:follow_pud_mask mm/gup.c:730 [inline]
RIP: 0010:follow_p4d_mask mm/gup.c:782 [inline]
RIP: 0010:follow_page_mask+0x1a9/0x1c90 mm/gup.c:846
Code: 00 80 88 ff ff 4c 01 e8 4d 89 e5 49 c1 ed 1b 41 81 e5 f8 0f 00 00 49 01 c5 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <80> 3c 02 00 0f 85 d4 18 00 00 4d 8b 75 00 31 ff 49 83 e6 9f 4c 89
RSP: 0000:ffffc90001e7fb10 EFLAGS: 00010a06
RAX: dffffc0000000000 RBX: ffff88810e732500 RCX: 0000000000000000
RDX: 1ffff2fda00001ff RSI: ffffffff8167fdbd RDI: 0000000000000007
RBP: ffffc90001e7fc48 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 00007fffffffefc0
R13: ffff97ed00000ff8 R14: 0000000000000000 R15: 0000000000002017
FS:  0000000000000000(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffeefda00001ff CR3: 0000000007825000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __get_user_pages+0x3f2/0x1020 mm/gup.c:1193
 __get_user_pages_locked mm/gup.c:1399 [inline]
 __get_user_pages_remote+0x18f/0x830 mm/gup.c:2109
 get_user_pages_remote+0x84/0xc0 mm/gup.c:2182
 get_arg_page+0xe4/0x2a0 fs/exec.c:222
 copy_string_kernel+0x169/0x460 fs/exec.c:639
 copy_strings_kernel+0xb3/0x190 fs/exec.c:655
 kernel_execve+0x377/0x500 fs/exec.c:2001
 call_usermodehelper_exec_async+0x2e3/0x580 kernel/umh.c:112
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306
 </TASK>
Modules linked in:
CR2: ffffeefda00001ff
---[ end trace 0000000000000000 ]---
RIP: 0010:native_pud_val arch/x86/include/asm/pgtable_types.h:347 [inline]
RIP: 0010:pud_none arch/x86/include/asm/pgtable.h:829 [inline]
RIP: 0010:follow_pud_mask mm/gup.c:730 [inline]
RIP: 0010:follow_p4d_mask mm/gup.c:782 [inline]
RIP: 0010:follow_page_mask+0x1a9/0x1c90 mm/gup.c:846
Code: 00 80 88 ff ff 4c 01 e8 4d 89 e5 49 c1 ed 1b 41 81 e5 f8 0f 00 00 49 01 c5 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <80> 3c 02 00 0f 85 d4 18 00 00 4d 8b 75 00 31 ff 49 83 e6 9f 4c 89
RSP: 0000:ffffc90001e7fb10 EFLAGS: 00010a06
RAX: dffffc0000000000 RBX: ffff88810e732500 RCX: 0000000000000000
RDX: 1ffff2fda00001ff RSI: ffffffff8167fdbd RDI: 0000000000000007
RBP: ffffc90001e7fc48 R08: 0000000000000007 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 00007fffffffefc0
R13: ffff97ed00000ff8 R14: 0000000000000000 R15: 0000000000002017
FS:  0000000000000000(0000) GS:ffff8881f6900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffeefda00001ff CR3: 0000000007825000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	00 80 88 ff ff 4c    	add    %al,0x4cffff88(%rax)
   6:	01 e8                	add    %ebp,%eax
   8:	4d 89 e5             	mov    %r12,%r13
   b:	49 c1 ed 1b          	shr    $0x1b,%r13
   f:	41 81 e5 f8 0f 00 00 	and    $0xff8,%r13d
  16:	49 01 c5             	add    %rax,%r13
  19:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  20:	fc ff df
  23:	4c 89 ea             	mov    %r13,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 d4 18 00 00    	jne    0x1908
  34:	4d 8b 75 00          	mov    0x0(%r13),%r14
  38:	31 ff                	xor    %edi,%edi
  3a:	49 83 e6 9f          	and    $0xffffffffffffff9f,%r14
  3e:	4c                   	rex.WR
  3f:	89                   	.byte 0x89

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets Title
ci2-upstream-usb 2022/09/02 14:38 https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing 4e55e22d3d9a 25194605 .config console log report [disk image] [vmlinux] usb-testing boot error: BUG: unable to handle kernel paging request in follow_page_mask
* Struck through repros no longer work on HEAD.