syzbot


BUG: corrupted list in vcs_remove_sysfs

Status: upstream: reported on 2022/10/03 07:55
Reported-by: syzbot+a1aa6dc8a74dbbaa251f@syzkaller.appspotmail.com
First crash: 59d, last: 59d

Sample crash report:
list_del corruption. prev->next should be ffff88807a8d9008, but was ffff88803a1e0540. (prev=ffff88803a1e0540)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:61!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 29413 Comm: syz-executor.0 Not tainted 6.0.0-rc7-syzkaller-00068-g49c13ed0316d #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
RIP: 0010:__list_del_entry_valid+0x118/0x130 lib/list_debug.c:59
Code: 05 0f 0b 48 c7 c7 20 6c 0a 8b 4c 89 fe 31 c0 e8 85 c8 fc 05 0f 0b 48 c7 c7 80 6c 0a 8b 4c 89 fe 48 89 d9 31 c0 e8 6f c8 fc 05 <0f> 0b 48 c7 c7 00 6d 0a 8b 4c 89 fe 4c 89 f1 31 c0 e8 59 c8 fc 05
RSP: 0018:ffffc90006237740 EFLAGS: 00010246
RAX: 000000000000006d RBX: ffff88803a1e0540 RCX: 07e0edd39d6fce00
RDX: ffffc900039b1000 RSI: 00000000000169a1 RDI: 00000000000169a2
RBP: 1ffff1100f51b204 R08: ffffffff816d5a8d R09: ffffed10173667f1
R10: ffffed10173667f1 R11: 1ffff110173667f0 R12: dffffc0000000000
R13: ffff88807a8d9000 R14: ffff88807afe9008 R15: ffff88807a8d9008
FS:  00007ff8983f1700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ed21000 CR3: 0000000017934000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __list_del_entry include/linux/list.h:134 [inline]
 list_del_init include/linux/list.h:206 [inline]
 kobj_kset_leave lib/kobject.c:175 [inline]
 __kobject_del+0x132/0x300 lib/kobject.c:592
 kobject_del+0x41/0x60 lib/kobject.c:611
 device_del+0xa10/0xbe0 drivers/base/core.c:3715
 device_unregister drivers/base/core.c:3736 [inline]
 device_destroy+0xad/0x180 drivers/base/core.c:4302
 vcs_remove_sysfs+0x1d/0x50 drivers/tty/vt/vc_screen.c:796
 vc_deallocate+0x1d2/0x3e0 drivers/tty/vt/vt.c:1399
 vt_disallocate_all+0x2b9/0x470 drivers/tty/vt/vt_ioctl.c:657
 vt_ioctl+0x1914/0x1d00 drivers/tty/vt/vt_ioctl.c:902
 tty_ioctl+0x874/0xc60 drivers/tty/tty_io.c:2778
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:870 [inline]
 __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7ff89728a5a9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff8983f1168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ff8973abf80 RCX: 00007ff89728a5a9
RDX: 0000000000000000 RSI: 0000000000005608 RDI: 0000000000000003
RBP: 00007ff8972e5560 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff8b4be86f R14: 00007ff8983f1300 R15: 0000000000022000
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_del_entry_valid+0x118/0x130 lib/list_debug.c:59
Code: 05 0f 0b 48 c7 c7 20 6c 0a 8b 4c 89 fe 31 c0 e8 85 c8 fc 05 0f 0b 48 c7 c7 80 6c 0a 8b 4c 89 fe 48 89 d9 31 c0 e8 6f c8 fc 05 <0f> 0b 48 c7 c7 00 6d 0a 8b 4c 89 fe 4c 89 f1 31 c0 e8 59 c8 fc 05
RSP: 0018:ffffc90006237740 EFLAGS: 00010246
RAX: 000000000000006d RBX: ffff88803a1e0540 RCX: 07e0edd39d6fce00
RDX: ffffc900039b1000 RSI: 00000000000169a1 RDI: 00000000000169a2
RBP: 1ffff1100f51b204 R08: ffffffff816d5a8d R09: ffffed10173667f1
R10: ffffed10173667f1 R11: 1ffff110173667f0 R12: dffffc0000000000
R13: ffff88807a8d9000 R14: ffff88807afe9008 R15: ffff88807a8d9008
FS:  00007ff8983f1700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2ed21000 CR3: 0000000017934000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (1):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-smack-root 2022/09/28 18:13 upstream 49c13ed0316d e2556bc3 .config log report info BUG: corrupted list in vcs_remove_sysfs
* Struck through repros no longer work on HEAD.