syzbot


general protection fault in del_gendisk (5)

Status: closed as dup on 2022/07/11 15:32
Reported-by: syzbot+8fe1ba2605ff4383aca1@syzkaller.appspotmail.com
First crash: 704d, last: 704d
Cause bisection: introduced by (bisect log) :
commit bda49ad0602e5250a9d3dd61deda19d3e5615c54
Author: Bart Van Assche <bvanassche@google.com>
Date: Mon Aug 2 17:05:29 2021 +0000

  FROMGIT: loop: Select I/O scheduler 'none' from inside add_disk()

Crash: general protection fault in del_gendisk (log)
Repro: C syz .config
  
Duplicate of
Title Repro Cause bisect Fix bisect Count Last Reported
general protection fault in del_gendisk C error 1 841d 947d
Similar bugs (7)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
android-5-10 general protection fault in del_gendisk (4) C done 1 738d 735d 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 538d 0/2 upstream: reported C repro on 2022/12/22 23:51
android-54 general protection fault in del_gendisk C 8 43d 537d 0/2 upstream: reported C repro on 2022/12/24 00:28
android-5-10 general protection fault in del_gendisk (2) C error 2 777d 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 947d 0/2 closed as invalid on 2022/03/02 21:49

Sample crash report:
RBP: 00007ffe5b36fd00 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000004
R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000
---[ end trace ab9e6fe86789591c ]---
general protection fault, probably for non-canonical address 0xdffffc000000001a: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000000d0-0x00000000000000d7]
CPU: 0 PID: 376 Comm: syz-executor330 Tainted: G        W         5.10.118-syzkaller-00163-gfa7f6a5f56d9 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/29/2022
RIP: 0010:kill_device drivers/base/core.c:3361 [inline]
RIP: 0010:device_del+0xdf/0xf00 drivers/base/core.c:3389
Code: 20 42 80 3c 28 00 74 08 48 89 df e8 9b 16 df fe 4c 89 7c 24 48 41 bf d0 00 00 00 48 89 5c 24 18 4c 03 3b 4d 89 fc 49 c1 ec 03 <43> 8a 04 2c 84 c0 0f 85 0d 0d 00 00 41 0f b6 1f 89 de 83 e6 01 31
RSP: 0018:ffffc90000b27b60 EFLAGS: 00010202
RAX: 1ffff110209b241a RBX: ffff888104d920d0 RCX: ffffffff8492a346
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc90000b27ae0
RBP: ffffc90000b27c50 R08: dffffc0000000000 R09: fffff52000164f5d
R10: fffff52000164f5d R11: 1ffff92000164f5c R12: 000000000000001a
R13: dffffc0000000000 R14: ffff888104d92108 R15: 00000000000000d0
FS:  00005555556bd300(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2ae9ad7144 CR3: 0000000105fc4000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 del_gendisk+0xbf2/0xe20 block/genhd.c:953
 loop_remove+0x46/0xb0 drivers/block/loop.c:2185
 loop_control_ioctl+0x67f/0x740 drivers/block/loop.c:2284
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl+0x115/0x190 fs/ioctl.c:739
 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:739
 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f2ae9a7f0b9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe5b36fce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007f2ae9a7f0b9
RDX: 000000000000000c RSI: 0000000000004c81 RDI: 0000000000000005
RBP: 00007ffe5b36fd00 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000004
R13: 431bde82d7b634db R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
---[ end trace ab9e6fe86789591d ]---
RIP: 0010:kill_device drivers/base/core.c:3361 [inline]
RIP: 0010:device_del+0xdf/0xf00 drivers/base/core.c:3389
Code: 20 42 80 3c 28 00 74 08 48 89 df e8 9b 16 df fe 4c 89 7c 24 48 41 bf d0 00 00 00 48 89 5c 24 18 4c 03 3b 4d 89 fc 49 c1 ec 03 <43> 8a 04 2c 84 c0 0f 85 0d 0d 00 00 41 0f b6 1f 89 de 83 e6 01 31
RSP: 0018:ffffc90000b27b60 EFLAGS: 00010202
RAX: 1ffff110209b241a RBX: ffff888104d920d0 RCX: ffffffff8492a346
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc90000b27ae0
RBP: ffffc90000b27c50 R08: dffffc0000000000 R09: fffff52000164f5d
R10: fffff52000164f5d R11: 1ffff92000164f5c R12: 000000000000001a
R13: dffffc0000000000 R14: ffff888104d92108 R15: 00000000000000d0
FS:  00005555556bd300(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2ae9ad7144 CR3: 0000000105fc4000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	20 42 80             	and    %al,-0x80(%rdx)
   3:	3c 28                	cmp    $0x28,%al
   5:	00 74 08 48          	add    %dh,0x48(%rax,%rcx,1)
   9:	89 df                	mov    %ebx,%edi
   b:	e8 9b 16 df fe       	callq  0xfedf16ab
  10:	4c 89 7c 24 48       	mov    %r15,0x48(%rsp)
  15:	41 bf d0 00 00 00    	mov    $0xd0,%r15d
  1b:	48 89 5c 24 18       	mov    %rbx,0x18(%rsp)
  20:	4c 03 3b             	add    (%rbx),%r15
  23:	4d 89 fc             	mov    %r15,%r12
  26:	49 c1 ec 03          	shr    $0x3,%r12
* 2a:	43 8a 04 2c          	mov    (%r12,%r13,1),%al <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	0f 85 0d 0d 00 00    	jne    0xd43
  36:	41 0f b6 1f          	movzbl (%r15),%ebx
  3a:	89 de                	mov    %ebx,%esi
  3c:	83 e6 01             	and    $0x1,%esi
  3f:	31                   	.byte 0x31

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2022/07/10 02:58 android12-5.10-lts fa7f6a5f56d9 b5765a15 .config strace log report syz C ci2-android-5-10 general protection fault in del_gendisk
* Struck through repros no longer work on HEAD.