bisecting fixing commit since 359c92c02bfae1a6f1e8e37c298e518fd256642c
building syzkaller on a75b198cd071926905c294db80393240f55a9a0f
testing commit 359c92c02bfae1a6f1e8e37c298e518fd256642c with gcc (GCC) 8.1.0
kernel signature: 07de2fd7635464998634259344775491d6487cee342dd8a8d758574ea57f6195
all runs: crashed: general protection fault in fbcon_cursor
testing current HEAD 5ad0ec0b86525d0c5d3d250d3cfad7f183b00cfa
testing commit 5ad0ec0b86525d0c5d3d250d3cfad7f183b00cfa with gcc (GCC) 8.1.0
kernel signature: 7b1786987ab28228221f18789ec9a2f4773cbcb4ffab67b21909d1f543ada8c9
all runs: crashed: general protection fault in fbcon_cursor
revisions tested: 2, total time: 21m15.3132911s (build: 12m32.529884909s, test: 7m53.093869944s)
the crash still happens on HEAD
commit msg: Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
crash: general protection fault in fbcon_cursor
general protection fault, probably for non-canonical address 0xdffffc0020000001: 0000 [#1] PREEMPT SMP KASAN
KASAN: probably user-memory-access in range [0x0000000100000008-0x000000010000000f]
CPU: 0 PID: 2800 Comm: kworker/0:16 Not tainted 5.6.0-rc6-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events console_callback
RIP: 0010:fbcon_cursor+0x10f/0x570 drivers/video/fbdev/core/fbcon.c:1387
Code: df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 0b 04 00 00 4c 8b ab a0 03 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <0f> b6 14 02 4c 89 e8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 d9
RSP: 0018:ffffc9000845fb28 EFLAGS: 00010203
RAX: dffffc0000000000 RBX: ffff888084083000 RCX: 0000000000000002
RDX: 0000000020000001 RSI: 0000000000000001 RDI: ffff8880840833a0
RBP: ffffc9000845fb68 R08: 0000000000000000 R09: 000000000000001f
R10: ffffed10431e8103 R11: ffff888218f4081f R12: ffff888218f9e000
R13: 000000010000000c R14: ffff888218f9e468 R15: ffff888218f8c800
FS:  0000000000000000(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc2b8891000 CR3: 0000000086670000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 set_cursor+0x192/0x200 drivers/tty/vt/vt.c:908
 redraw_screen+0x555/0x720 drivers/tty/vt/vt.c:1024
 complete_change_console+0xfd/0x300 drivers/tty/vt/vt_ioctl.c:1269
 change_console+0x141/0x240 drivers/tty/vt/vt_ioctl.c:1394
 console_callback+0x307/0x370 drivers/tty/vt/vt.c:2835
 process_one_work+0x88b/0x1680 kernel/workqueue.c:2266
 worker_thread+0x85/0xb60 kernel/workqueue.c:2412
 kthread+0x331/0x3f0 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Modules linked in:
---[ end trace 1101491565e6f4f7 ]---
RIP: 0010:fbcon_cursor+0x10f/0x570 drivers/video/fbdev/core/fbcon.c:1387
Code: df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 0b 04 00 00 4c 8b ab a0 03 00 00 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1 ea 03 <0f> b6 14 02 4c 89 e8 83 e0 07 83 c0 01 38 d0 7c 08 84 d2 0f 85 d9
RSP: 0018:ffffc9000845fb28 EFLAGS: 00010203
RAX: dffffc0000000000 RBX: ffff888084083000 RCX: 0000000000000002
RDX: 0000000020000001 RSI: 0000000000000001 RDI: ffff8880840833a0
RBP: ffffc9000845fb68 R08: 0000000000000000 R09: 000000000000001f
R10: ffffed10431e8103 R11: ffff888218f4081f R12: ffff888218f9e000
R13: 000000010000000c R14: ffff888218f9e468 R15: ffff888218f8c800
FS:  0000000000000000(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc2b8891000 CR3: 0000000086670000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400