syzbot

 sign-in | mailing list | source | docs
🐞 Open [1445]
≡ Subsystems
🐞 Fixed [5832]
🐞 Invalid [14247]
⬇ Missing Backports [92]
≡ Crashes
Kernel Health Bugs/Month Bug Lifetimes Fuzzing
Total Repo Heatmap Subsystems Heatmap
💬 Send us feedback

BUG: unable to handle kernel NULL pointer dereference in qlist_free_all (8)

Status: auto-closed as invalid on 2021/01/30 15:56
Subsystems: kvm
[Documentation on labels]
Reported-by: syzbot+4bba137eaf7cc94b57ca@syzkaller.appspotmail.com
First crash: 1564d, last: 1513d
▶ ▼ Discussions (1)
Title Replies (including bot) Last reply
BUG: unable to handle kernel NULL pointer dereference in qlist_free_all (8) 0 (1) 2020/09/10 06:26
▶ ▼ Similar bugs (12)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 BUG: unable to handle kernel NULL pointer dereference in qlist_free_all 1 1679d 1679d 0/1 auto-closed as invalid on 2020/08/18 08:06
linux-4.19 BUG: unable to handle kernel NULL pointer dereference in qlist_free_all (2) 8 1045d 1282d 0/1 auto-closed as invalid on 2022/05/13 11:55
upstream BUG: unable to handle kernel NULL pointer dereference in qlist_free_all (4) mm 8 2497d 2544d 0/28 closed as invalid on 2018/02/12 16:58
upstream BUG: unable to handle kernel NULL pointer dereference in qlist_free_all (6) ext4 syz 7 2056d 2155d 0/28 closed as dup on 2018/12/31 07:50
upstream BUG: unable to handle kernel NULL pointer dereference in qlist_free_all (7) tomoyo 7 1659d 1719d 0/28 closed as invalid on 2020/07/06 10:57
upstream BUG: unable to handle kernel NULL pointer dereference in qlist_free_all (2) kernel 1 2573d 2573d 0/28 closed as invalid on 2017/11/09 10:06
upstream BUG: unable to handle kernel NULL pointer dereference in qlist_free_all fs 1 2609d 2609d 0/28 closed as invalid on 2017/10/18 09:51
linux-4.14 BUG: unable to handle kernel NULL pointer dereference in qlist_free_all 2 1649d 1682d 0/1 auto-closed as invalid on 2020/09/17 07:42
upstream BUG: unable to handle kernel paging request in qlist_free_all (7) kernel 20 1086d 1307d 0/28 auto-closed as invalid on 2022/03/03 13:56
linux-4.14 BUG: unable to handle kernel NULL pointer dereference in qlist_free_all (2) 3 1289d 1314d 0/1 auto-closed as invalid on 2021/09/12 03:17
upstream BUG: unable to handle kernel NULL pointer dereference in qlist_free_all (5) fs 19 2403d 2460d 0/28 closed as invalid on 2018/05/26 17:43
upstream BUG: unable to handle kernel NULL pointer dereference in qlist_free_all (3) mm 8 2547d 2563d 0/28 closed as invalid on 2017/12/05 10:45

Sample crash report:
BUG: kernel NULL pointer dereference, address: 0000000000000080
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 5140a067 P4D 5140a067 PUD 5ba34067 PMD 0 
Oops: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 15187 Comm: syz-executor.4 Not tainted 5.9.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:qlink_to_object mm/kasan/quarantine.c:137 [inline]
RIP: 0010:qlink_free mm/kasan/quarantine.c:142 [inline]
RIP: 0010:qlist_free_all+0x36/0x170 mm/kasan/quarantine.c:168
Code: 53 48 83 ec 10 48 8b 37 48 85 f6 0f 84 36 01 00 00 49 bf 00 00 00 00 00 fc ff df 48 85 ed 49 89 fd 48 89 ef 0f 84 97 00 00 00 <48> 63 87 80 00 00 00 4c 8b 26 48 29 c6 48 83 3d 35 54 45 08 00 0f
RSP: 0018:ffffc90018d5fcf8 EFLAGS: 00010246
RAX: ffffea0000000000 RBX: 0000000000000286 RCX: ffffea0000000007
RDX: 0000000000000000 RSI: ffff888000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888000000000
R13: ffffc90018d5fd40 R14: 0000000000000200 R15: dffffc0000000000
FS:  00007f8797d16700(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000080 CR3: 00000000a6e29000 CR4: 00000000001526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 quarantine_reduce+0x17e/0x200 mm/kasan/quarantine.c:261
 __kasan_kmalloc.constprop.0+0x9e/0xd0 mm/kasan/common.c:442
 slab_post_alloc_hook mm/slab.h:518 [inline]
 slab_alloc mm/slab.c:3316 [inline]
 kmem_cache_alloc_trace+0x13d/0x300 mm/slab.c:3552
 kmalloc include/linux/slab.h:554 [inline]
 kzalloc include/linux/slab.h:666 [inline]
 kvm_create_vm_debugfs arch/x86/kvm/../../../virt/kvm/kvm_main.c:708 [inline]
 kvm_dev_ioctl_create_vm arch/x86/kvm/../../../virt/kvm/kvm_main.c:3939 [inline]
 kvm_dev_ioctl+0x7d7/0x13a0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:3966
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl fs/ioctl.c:739 [inline]
 __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:739
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45dd99
Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f8797d15c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000011180 RCX: 000000000045dd99
RDX: 0000000000000000 RSI: 000000000000ae01 RDI: 0000000000000004
RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c
R13: 000000000169fb6f R14: 00007f8797d169c0 R15: 000000000118bf2c
Modules linked in:
CR2: 0000000000000080
---[ end trace 478bf344c33695ed ]---
RIP: 0010:qlink_to_object mm/kasan/quarantine.c:137 [inline]
RIP: 0010:qlink_free mm/kasan/quarantine.c:142 [inline]
RIP: 0010:qlist_free_all+0x36/0x170 mm/kasan/quarantine.c:168
Code: 53 48 83 ec 10 48 8b 37 48 85 f6 0f 84 36 01 00 00 49 bf 00 00 00 00 00 fc ff df 48 85 ed 49 89 fd 48 89 ef 0f 84 97 00 00 00 <48> 63 87 80 00 00 00 4c 8b 26 48 29 c6 48 83 3d 35 54 45 08 00 0f
RSP: 0018:ffffc90018d5fcf8 EFLAGS: 00010246
RAX: ffffea0000000000 RBX: 0000000000000286 RCX: ffffea0000000007
RDX: 0000000000000000 RSI: ffff888000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000000 R12: ffff888000000000
R13: ffffc90018d5fd40 R14: 0000000000000200 R15: dffffc0000000000
FS:  00007f8797d16700(0000) GS:ffff8880ae400000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f18366c3008 CR3: 00000000a6e29000 CR4: 00000000001526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (11):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2020/10/02 15:55 upstream 472e5b056f00 4969d6ca .config console log report info ci-upstream-kasan-gce
2020/10/01 20:30 upstream fcadab740480 9602ddf4 .config console log report info ci-upstream-kasan-gce
2020/09/21 11:15 upstream ba4f184e126b 9e1fa68e .config console log report info ci-upstream-kasan-gce
2020/09/20 04:43 upstream eb5f95f1593f 53ce8104 .config console log report info ci-upstream-kasan-gce
2020/09/18 22:06 upstream 92ab97adeefc 53ce8104 .config console log report info ci-upstream-kasan-gce
2020/09/10 20:41 upstream 7fe10096c150 409809d8 .config console log report ci-upstream-kasan-gce-root
2020/09/10 06:26 upstream 34d4ddd359db 409809d8 .config console log report ci-upstream-kasan-gce
2020/09/05 04:49 upstream 59126901f200 abf9ba4f .config console log report ci-upstream-kasan-gce
2020/08/31 19:04 upstream f75aef392f86 d5a3ae1f .config console log report ci-upstream-kasan-gce
2020/08/19 03:11 upstream 18445bf405cb e1c29030 .config console log report ci-upstream-kasan-gce-386
2020/08/12 18:41 upstream fb893de323e2 bc15f7db .config console log report ci-upstream-kasan-gce-386
* Struck through repros no longer work on HEAD.