syzbot


general protection fault in fbcon_event_notify

Status: auto-closed as invalid on 2020/04/28 01:46
Reported-by: syzbot+75a72895ac3b23f53ccc@syzkaller.appspotmail.com
First crash: 1821d, last: 1801d

Sample crash report:
netlink: 'syz-executor.5': attribute type 2 has an invalid length.
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: 1518 Comm: syz-executor.3 Not tainted 4.19.91-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:fbcon_fb_blanked drivers/video/fbdev/core/fbcon.c:3248 [inline]
RIP: 0010:fbcon_event_notify+0xa88/0x1dba drivers/video/fbdev/core/fbcon.c:3374
Code: 0f 85 2b 13 00 00 48 8d 04 db 4c 8b 3c c5 20 ea 6c 8b 48 b8 00 00 00 00 00 fc ff df 49 8d bf 7c 03 00 00 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 fb 12 00 00
RSP: 0018:ffff88809eeff840 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: 000000000000003e RCX: ffffc900070c1000
RDX: 000000000000006f RSI: ffffffff838246fd RDI: 000000000000037c
RBP: ffff88809eeff8a0 R08: ffff888096aa6380 R09: 0000000000000002
R10: ffff888096aa6c50 R11: ffffffff8a776b38 R12: ffff888219743180
R13: ffff88809eeff9b8 R14: ffff8882196eb800 R15: 0000000000000000
FS:  00007fd5a4508700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc43d0a2848 CR3: 000000009593a000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 notifier_call_chain+0xc2/0x230 kernel/notifier.c:93
 __blocking_notifier_call_chain kernel/notifier.c:317 [inline]
 __blocking_notifier_call_chain kernel/notifier.c:304 [inline]
 blocking_notifier_call_chain kernel/notifier.c:328 [inline]
 blocking_notifier_call_chain+0x94/0xb0 kernel/notifier.c:325
 fb_notifier_call_chain+0x25/0x30 drivers/video/fbdev/core/fb_notify.c:45
 fb_blank+0x1b5/0x200 drivers/video/fbdev/core/fbmem.c:1070
 do_fb_ioctl+0x1d9/0xab0 drivers/video/fbdev/core/fbmem.c:1206
 fb_ioctl+0xe6/0x130 drivers/video/fbdev/core/fbmem.c:1230
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0xd5f/0x1380 fs/ioctl.c:688
 ksys_ioctl+0xab/0xd0 fs/ioctl.c:705
 __do_sys_ioctl fs/ioctl.c:712 [inline]
 __se_sys_ioctl fs/ioctl.c:710 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:710
 do_syscall_64+0xfd/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45a919
Code: ad b6 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 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fd5a4507c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000045a919
RDX: 00000000200001c0 RSI: 0000000000004611 RDI: 0000000000000005
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fd5a45086d4
R13: 00000000004c30e3 R14: 00000000004d8468 R15: 00000000ffffffff
Modules linked in:
---[ end trace db69dc497d7ea81b ]---
RIP: 0010:fbcon_fb_blanked drivers/video/fbdev/core/fbcon.c:3248 [inline]
RIP: 0010:fbcon_event_notify+0xa88/0x1dba drivers/video/fbdev/core/fbcon.c:3374
Code: 0f 85 2b 13 00 00 48 8d 04 db 4c 8b 3c c5 20 ea 6c 8b 48 b8 00 00 00 00 00 fc ff df 49 8d bf 7c 03 00 00 48 89 fa 48 c1 ea 03 <0f> b6 04 02 48 89 fa 83 e2 07 38 d0 7f 08 84 c0 0f 85 fb 12 00 00
RSP: 0018:ffff88809eeff840 EFLAGS: 00010207
RAX: dffffc0000000000 RBX: 000000000000003e RCX: ffffc900070c1000
RDX: 000000000000006f RSI: ffffffff838246fd RDI: 000000000000037c
RBP: ffff88809eeff8a0 R08: ffff888096aa6380 R09: 0000000000000002
R10: ffff888096aa6c50 R11: ffffffff8a776b38 R12: ffff888219743180
R13: ffff88809eeff9b8 R14: ffff8882196eb800 R15: 0000000000000000
FS:  00007fd5a4508700(0000) GS:ffff8880ae900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe2ad23ff0 CR3: 000000009593a000 CR4: 00000000001406e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400

Crashes (2):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/12/30 01:46 linux-4.19.y 672481c2deff af6b8ef8 .config console log report ci2-linux-4-19
2019/12/10 05:42 linux-4.19.y fb683b5e3f53 4b83c8fb .config console log report ci2-linux-4-19
* Struck through repros no longer work on HEAD.