syzbot


general protection fault in del_gendisk

Status: upstream: reported C repro on 2022/12/24 00:28
Reported-by: syzbot+6bbe34fc87953b72ac13@syzkaller.appspotmail.com
First crash: 538d, last: 43d
Similar bugs (7)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-10 general protection fault in del_gendisk (5) C done 1 704d 704d 0/2 closed as dup on 2022/07/11 15:32
android-5-10 general protection fault in del_gendisk (4) C done 1 738d 736d 0/2 closed as dup on 2022/06/08 16:47
android-5-10 general protection fault in del_gendisk (7) C error inconclusive 54 54d 539d 0/2 upstream: reported C repro on 2022/12/22 23:51
android-5-10 general protection fault in del_gendisk (2) C error 2 778d 778d 0/2 closed as invalid on 2022/05/05 22:31
android-5-10 general protection fault in del_gendisk (3) C done 1 753d 753d 0/2 closed as invalid on 2022/06/03 17:43
android-5-10 general protection fault in del_gendisk (6) C done 1 620d 617d 0/2 closed as dup on 2022/10/05 23:44
android-5-10 general protection fault in del_gendisk C error 1 841d 948d 0/2 closed as invalid on 2022/03/02 21:49
Last patch testing requests (9)
Created Duration User Patch Repo Result
2024/05/01 12:39 5m retest repro android12-5.4 report log
2024/04/17 08:59 4m retest repro android12-5.4 report log
2024/02/21 09:16 14m retest repro android12-5.4 report log
2024/02/07 08:28 29m retest repro android12-5.4 report log
2023/12/13 07:04 11m retest repro android12-5.4 report log
2023/11/29 06:51 9m retest repro android12-5.4 report log
2023/09/29 18:08 7m retest repro android12-5.4 report log
2023/07/21 15:27 2h41m retest repro android12-5.4 report log
2023/05/12 15:05 11m retest repro android12-5.4 report log

Sample crash report:
 do_vfs_ioctl+0x742/0x1720 fs/ioctl.c:47
 ksys_ioctl fs/ioctl.c:742 [inline]
 __do_sys_ioctl fs/ioctl.c:749 [inline]
 __se_sys_ioctl fs/ioctl.c:747 [inline]
 __x64_sys_ioctl+0xd4/0x110 fs/ioctl.c:747
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
---[ end trace c7de77ef8c43dad5 ]---
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 359 Comm: syz-executor277 Tainted: G        W         5.4.254-syzkaller-00011-g2ac128c04e33 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/09/2023
RIP: 0010:kill_device drivers/base/core.c:3022 [inline]
RIP: 0010:device_del+0xe7/0xfa0 drivers/base/core.c:3049
Code: df e8 6d e7 fd fe 4c 89 7c 24 18 41 bf c8 00 00 00 48 89 5c 24 08 4c 03 3b 4d 89 fc 49 c1 ec 03 48 b8 00 00 00 00 00 fc ff df <41> 0f b6 04 04 84 c0 0f 85 31 0e 00 00 41 0f b6 1f 89 de 83 e6 01
RSP: 0018:ffff8881de09f9c0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8881dc0650d8 RCX: 1ffff1103b80ca1b
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff8881de09f940
RBP: ffff8881de09fa90 R08: dffffc0000000000 R09: ffffed103bc13f29
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000019
R13: ffff8881dc065070 R14: ffff8881dc065110 R15: 00000000000000c8
FS:  00005555569bf380(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000561d46168d60 CR3: 00000001dc0e8000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 del_gendisk+0x9d9/0xc30 block/genhd.c:835
 loop_remove+0x42/0xa0 drivers/block/loop.c:2194
 loop_control_ioctl+0x564/0x620 drivers/block/loop.c:2293
 do_vfs_ioctl+0x742/0x1720 fs/ioctl.c:47
 ksys_ioctl fs/ioctl.c:742 [inline]
 __do_sys_ioctl fs/ioctl.c:749 [inline]
 __se_sys_ioctl fs/ioctl.c:747 [inline]
 __x64_sys_ioctl+0xd4/0x110 fs/ioctl.c:747
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
Modules linked in:
---[ end trace c7de77ef8c43dad6 ]---
RIP: 0010:kill_device drivers/base/core.c:3022 [inline]
RIP: 0010:device_del+0xe7/0xfa0 drivers/base/core.c:3049
Code: df e8 6d e7 fd fe 4c 89 7c 24 18 41 bf c8 00 00 00 48 89 5c 24 08 4c 03 3b 4d 89 fc 49 c1 ec 03 48 b8 00 00 00 00 00 fc ff df <41> 0f b6 04 04 84 c0 0f 85 31 0e 00 00 41 0f b6 1f 89 de 83 e6 01
RSP: 0018:ffff8881de09f9c0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8881dc0650d8 RCX: 1ffff1103b80ca1b
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff8881de09f940
RBP: ffff8881de09fa90 R08: dffffc0000000000 R09: ffffed103bc13f29
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000019
R13: ffff8881dc065070 R14: ffff8881dc065110 R15: 00000000000000c8
FS:  00005555569bf380(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000561d46168d60 CR3: 00000001dc0e8000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	df e8                	fucomip %st(0),%st
   2:	6d                   	insl   (%dx),%es:(%rdi)
   3:	e7 fd                	out    %eax,$0xfd
   5:	fe 4c 89 7c          	decb   0x7c(%rcx,%rcx,4)
   9:	24 18                	and    $0x18,%al
   b:	41 bf c8 00 00 00    	mov    $0xc8,%r15d
  11:	48 89 5c 24 08       	mov    %rbx,0x8(%rsp)
  16:	4c 03 3b             	add    (%rbx),%r15
  19:	4d 89 fc             	mov    %r15,%r12
  1c:	49 c1 ec 03          	shr    $0x3,%r12
  20:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  27:	fc ff df
* 2a:	41 0f b6 04 04       	movzbl (%r12,%rax,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 31 0e 00 00    	jne    0xe68
  37:	41 0f b6 1f          	movzbl (%r15),%ebx
  3b:	89 de                	mov    %ebx,%esi
  3d:	83 e6 01             	and    $0x1,%esi

Crashes (8):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/11/15 06:19 android12-5.4 2ac128c04e33 cb976f63 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan general protection fault in del_gendisk
2022/12/24 00:40 android12-5.4 a8aad8851131 9da18ae8 .config strace log report syz C [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan general protection fault in del_gendisk
2023/11/11 23:03 android12-5.4 2ac128c04e33 6d6dbf8a .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan general protection fault in del_gendisk
2023/08/29 13:36 android12-5.4 c83e2462239e 7ba13a15 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan general protection fault in del_gendisk
2023/02/13 13:54 android12-5.4 6a5ec6cea0cd 957959cb .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan general protection fault in del_gendisk
2022/12/26 23:04 android12-5.4 a8aad8851131 9da18ae8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan general protection fault in del_gendisk
2022/12/25 06:35 android12-5.4 a8aad8851131 9da18ae8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan general protection fault in del_gendisk
2022/12/24 00:27 android12-5.4 a8aad8851131 9da18ae8 .config console log report info [disk image] [vmlinux] [kernel image] ci2-android-5-4-kasan general protection fault in del_gendisk
* Struck through repros no longer work on HEAD.