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memory leak in fbcon_set_font (3)

Status: upstream: reported C repro on 2023/05/25 11:17
Subsystems: fbdev
[Documentation on labels]
Reported-by: syzbot+6fda7f092994bd03fad1@syzkaller.appspotmail.com
First crash: 1122d, last: 70d
▶ ▼ ✨ AI Jobs (4)
ID Workflow Result Correct Bug Created Started Finished Revision Error
674570a5-77cb-466c-aec1-de5a4300f34f assessment-security 💥 memory leak in fbcon_set_font (3) 2026/06/14 01:34 2026/06/14 01:34 2026/06/14 01:48 4f06757f683a802254a4c8edbfe67ff801904c5e 
failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/833d73ea7d9d32a86d...
truncated to first 200 bytes; open job for full error
dfbc7905-7af1-402e-a050-8f72b948640f assessment-security 💥 memory leak in fbcon_set_font (3) 2026/06/09 16:48 2026/06/09 16:48 2026/06/09 17:03 c36c07f6c1f2230a36374cbd22235f635e8f9284 
failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/833d73ea7d9d32a86d...
truncated to first 200 bytes; open job for full error
aa1ec564-7065-47bf-bec9-7045c4f80556 assessment-security 💥 memory leak in fbcon_set_font (3) 2026/06/02 11:22 2026/06/02 11:22 2026/06/02 11:43 1095583bae1d2729a3b4be301cb6ddc85ced9e38 
failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/833d73ea7d9d32a86d...
truncated to first 200 bytes; open job for full error
29ef04b2-90f1-49c6-ad24-f6fc15f39ee8 assessment-security 💥 memory leak in fbcon_set_font (3) 2026/05/24 14:14 2026/05/24 14:14 2026/05/24 14:39 c69befb30ac10e158cc9d1557b508ee3f0eca1de 
failed to run ["make" "KERNELVERSION=syzkaller" "KERNELRELEASE=syzkaller" "LOCALVERSION=-syzkaller" "-j" "32" "ARCH=x86_64" "CC=ccache clang" "LD=ld.lld" "O=/app/workdir/cache/build/833d73ea7d9d32a86d...
truncated to first 200 bytes; open job for full error
▶ ▼ Discussions (2)
Title Replies (including bot) Last reply
[syzbot] Monthly fbdev report (Apr 2026) 0 (1) 2026/04/20 07:05
[syzbot] [fbdev?] memory leak in fbcon_set_font (3) 0 (1) 2023/05/25 11:17
▶ ▼ Similar bugs (2)
Kernel Title Rank 🛈 Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream memory leak in fbcon_set_font fbdev 3 C 1 1980d 1980d 0/29 auto-obsoleted due to no activity on 2022/10/03 19:40
upstream memory leak in fbcon_set_font (2) fbdev 3 C 1 1290d 1289d 22/29 fixed on 2023/02/24 13:50
▶ ▼ Last patch testing requests (10)
Created Duration User Patch Repo Result
2026/06/16 20:53 33m retest repro upstream OK log
2026/04/07 15:31 18m retest repro upstream report log
2026/01/27 14:19 12m retest repro upstream report log
2025/11/18 13:46 17m retest repro upstream report log
2025/09/09 08:53 11m retest repro upstream report log
2025/07/01 07:45 42m retest repro upstream report log
2025/04/22 05:40 16m retest repro upstream report log
2025/02/11 05:12 20m retest repro upstream report log
2024/12/03 03:45 24m retest repro upstream report log
2024/09/23 00:14 11m retest repro upstream report log

Sample crash report:
BUG: memory leak
unreferenced object 0xffff88810eb60000 (size 26640):
  comm "syz-executor100", pid 4988, jiffies 4294944215 (age 14.910s)
  hex dump (first 32 bytes):
    03 cc 4b ef 00 00 00 00 00 68 00 00 01 00 00 00  ..K......h......
    0d e4 73 70 56 3e d4 50 e7 4f ba 9e e1 5c c0 c3  ..spV>.P.O...\..
  backtrace:
    [<ffffffff815460d7>] __do_kmalloc_node mm/slab_common.c:954 [inline]
    [<ffffffff815460d7>] __kmalloc+0xb7/0x120 mm/slab_common.c:979
    [<ffffffff826405bd>] kmalloc include/linux/slab.h:563 [inline]
    [<ffffffff826405bd>] fbcon_set_font+0x1ed/0x4a0 drivers/video/fbdev/core/fbcon.c:2502
    [<ffffffff8278ad5e>] con_font_set drivers/tty/vt/vt.c:4626 [inline]
    [<ffffffff8278ad5e>] con_font_op+0x5ae/0x730 drivers/tty/vt/vt.c:4673
    [<ffffffff82774b78>] vt_k_ioctl drivers/tty/vt/vt_ioctl.c:474 [inline]
    [<ffffffff82774b78>] vt_ioctl+0x468/0x1d90 drivers/tty/vt/vt_ioctl.c:752
    [<ffffffff82757161>] tty_ioctl+0x4c1/0xd00 drivers/tty/tty_io.c:2777
    [<ffffffff8167fa80>] vfs_ioctl fs/ioctl.c:51 [inline]
    [<ffffffff8167fa80>] __do_sys_ioctl fs/ioctl.c:870 [inline]
    [<ffffffff8167fa80>] __se_sys_ioctl fs/ioctl.c:856 [inline]
    [<ffffffff8167fa80>] __x64_sys_ioctl+0x100/0x140 fs/ioctl.c:856
    [<ffffffff84a14749>] do_syscall_x64 arch/x86/entry/common.c:50 [inline]
    [<ffffffff84a14749>] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
    [<ffffffff84c0008b>] entry_SYSCALL_64_after_hwframe+0x63/0xcd

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/05/21 11:12 upstream 0dd2a6fb1e34 4bce1a3e .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-gce-leak memory leak in fbcon_set_font
* Struck through repros no longer work on HEAD.