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Message-ID: <675519e0.050a0220.2477f.0025.GAE@google.com> Date: Sat, 07 Dec 2024 20:00:32 -0800 From: syzbot <syzbot+66bde8e1e4161d4b2cca@...kaller.appspotmail.com> To: deller@....de, dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org, simona@...ll.ch, syzkaller-bugs@...glegroups.com Subject: [syzbot] [fbdev?] BUG: unable to handle kernel paging request in bitfill_aligned (4) Hello, syzbot found the following issue on: HEAD commit: 4a5df3796467 Merge tag 'mm-hotfixes-stable-2024-11-16-15-3.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=149b5378580000 kernel config: https://syzkaller.appspot.com/x/.config?x=4fca5d6b7cd3e6f dashboard link: https://syzkaller.appspot.com/bug?extid=66bde8e1e4161d4b2cca compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-4a5df379.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/06ed0d86cf9b/vmlinux-4a5df379.xz kernel image: https://storage.googleapis.com/syzbot-assets/ffbf9a25c303/bzImage-4a5df379.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+66bde8e1e4161d4b2cca@...kaller.appspotmail.com BUG: unable to handle page fault for address: ffffc90004f81000 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 1b000067 P4D 1b000067 PUD 1c281067 PMD 2508d067 PTE 0 Oops: Oops: 0002 [#1] PREEMPT SMP KASAN NOPTI CPU: 2 UID: 0 PID: 7998 Comm: syz.4.504 Not tainted 6.12.0-rc7-syzkaller-00212-g4a5df3796467 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:memset64 arch/x86/include/asm/string_64.h:60 [inline] RIP: 0010:memset_l include/linux/string.h:240 [inline] RIP: 0010:bitfill_aligned drivers/video/fbdev/core/sysfillrect.c:53 [inline] RIP: 0010:bitfill_aligned+0x183/0x210 drivers/video/fbdev/core/sysfillrect.c:25 Code: 44 24 08 48 31 d0 49 89 45 f8 44 89 e0 29 e8 29 c3 e8 31 51 b4 fc 89 d8 31 d2 4c 89 ef 41 f7 f4 48 89 c3 48 89 c1 48 8b 04 24 <f3> 48 ab 31 ff 4c 89 f6 e8 80 53 b4 fc 4d 85 f6 0f 84 6a ff ff ff RSP: 0018:ffffc90003a7f6b8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000208 RCX: 0000000000000008 RDX: 0000000000000000 RSI: ffffffff84d92a2f RDI: ffffc90004f81000 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000040 R13: ffffc90004f80000 R14: 0000000000000000 R15: 0000000000008200 FS: 00007fc3433a96c0(0000) GS:ffff88806a800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffc90004f81000 CR3: 000000004c6ac000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> sys_fillrect+0x47b/0x900 drivers/video/fbdev/core/sysfillrect.c:284 drm_fbdev_shmem_defio_fillrect+0x22/0x140 drivers/gpu/drm/drm_fbdev_shmem.c:39 bit_clear_margins+0x302/0x4f0 drivers/video/fbdev/core/bitblit.c:232 fbcon_clear_margins.constprop.0+0x1d0/0x290 drivers/video/fbdev/core/fbcon.c:1319 fbcon_switch+0xa30/0x14f0 drivers/video/fbdev/core/fbcon.c:2190 redraw_screen+0x2bf/0x760 drivers/tty/vt/vt.c:957 fbcon_set_disp+0x7cc/0xe00 drivers/video/fbdev/core/fbcon.c:1412 con2fb_init_display drivers/video/fbdev/core/fbcon.c:812 [inline] set_con2fb_map+0x6fd/0x1060 drivers/video/fbdev/core/fbcon.c:885 fbcon_set_con2fb_map_ioctl+0x16d/0x220 drivers/video/fbdev/core/fbcon.c:3112 do_fb_ioctl+0x32a/0x7d0 drivers/video/fbdev/core/fb_chrdev.c:138 fb_ioctl+0xe5/0x150 drivers/video/fbdev/core/fb_chrdev.c:169 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl fs/ioctl.c:893 [inline] __x64_sys_ioctl+0x18f/0x220 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fc34257e719 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fc3433a9038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fc342736130 RCX: 00007fc34257e719 RDX: 00000000200005c0 RSI: 0000000000004610 RDI: 0000000000000004 RBP: 00007fc3425f175e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007fc342736130 R15: 00007ffee2ee6ad8 </TASK> Modules linked in: CR2: ffffc90004f81000 ---[ end trace 0000000000000000 ]--- RIP: 0010:memset64 arch/x86/include/asm/string_64.h:60 [inline] RIP: 0010:memset_l include/linux/string.h:240 [inline] RIP: 0010:bitfill_aligned drivers/video/fbdev/core/sysfillrect.c:53 [inline] RIP: 0010:bitfill_aligned+0x183/0x210 drivers/video/fbdev/core/sysfillrect.c:25 Code: 44 24 08 48 31 d0 49 89 45 f8 44 89 e0 29 e8 29 c3 e8 31 51 b4 fc 89 d8 31 d2 4c 89 ef 41 f7 f4 48 89 c3 48 89 c1 48 8b 04 24 <f3> 48 ab 31 ff 4c 89 f6 e8 80 53 b4 fc 4d 85 f6 0f 84 6a ff ff ff RSP: 0018:ffffc90003a7f6b8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000208 RCX: 0000000000000008 RDX: 0000000000000000 RSI: ffffffff84d92a2f RDI: ffffc90004f81000 RBP: 0000000000000000 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000040 R13: ffffc90004f80000 R14: 0000000000000000 R15: 0000000000008200 FS: 00007fc3433a96c0(0000) GS:ffff88806a800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffc90004f81000 CR3: 000000004c6ac000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 44 24 08 rex.R and $0x8,%al 3: 48 31 d0 xor %rdx,%rax 6: 49 89 45 f8 mov %rax,-0x8(%r13) a: 44 89 e0 mov %r12d,%eax d: 29 e8 sub %ebp,%eax f: 29 c3 sub %eax,%ebx 11: e8 31 51 b4 fc call 0xfcb45147 16: 89 d8 mov %ebx,%eax 18: 31 d2 xor %edx,%edx 1a: 4c 89 ef mov %r13,%rdi 1d: 41 f7 f4 div %r12d 20: 48 89 c3 mov %rax,%rbx 23: 48 89 c1 mov %rax,%rcx 26: 48 8b 04 24 mov (%rsp),%rax * 2a: f3 48 ab rep stos %rax,%es:(%rdi) <-- trapping instruction 2d: 31 ff xor %edi,%edi 2f: 4c 89 f6 mov %r14,%rsi 32: e8 80 53 b4 fc call 0xfcb453b7 37: 4d 85 f6 test %r14,%r14 3a: 0f 84 6a ff ff ff je 0xffffffaa --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
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