================================================================== BUG: KASAN: vmalloc-out-of-bounds in fb_write_offset drivers/video/fbdev/core/sysmem.h:30 [inline] BUG: KASAN: vmalloc-out-of-bounds in bitfill drivers/video/fbdev/core/fb_fillrect.h:133 [inline] BUG: KASAN: vmalloc-out-of-bounds in fb_fillrect_static drivers/video/fbdev/core/fb_fillrect.h:219 [inline] BUG: KASAN: vmalloc-out-of-bounds in fb_fillrect drivers/video/fbdev/core/fb_fillrect.h:278 [inline] BUG: KASAN: vmalloc-out-of-bounds in sys_fillrect+0x16b4/0x1aac drivers/video/fbdev/core/sysfillrect.c:24 Write of size 8 at addr ffff800093e19000 by task syz.5.874/9283 CPU: 1 UID: 0 PID: 9283 Comm: syz.5.874 Tainted: G L syzkaller #0 PREEMPT Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/23/2026 Call trace: show_stack+0x2c/0x3c arch/arm64/kernel/stacktrace.c:499 (C) __dump_stack+0x30 __dump_stack+0x30/0x40 lib/dump_stack.c:94 dump_stack_lvl+0xd8/0x12c lib/dump_stack.c:120 print_address_description+0xb0/0x238 mm/kasan/report.c:378 print_report+0x68/0x84 mm/kasan/report.c:482 kasan_report+0x8c/0xc4 mm/kasan/report.c:595 __asan_report_store8_noabort+0x20/0x2c mm/kasan/report_generic.c:386 fb_write_offset drivers/video/fbdev/core/sysmem.h:30 [inline] bitfill drivers/video/fbdev/core/fb_fillrect.h:133 [inline] fb_fillrect_static drivers/video/fbdev/core/fb_fillrect.h:219 [inline] fb_fillrect drivers/video/fbdev/core/fb_fillrect.h:278 [inline] sys_fillrect+0x16b4/0x1aac drivers/video/fbdev/core/sysfillrect.c:24 drm_fbdev_shmem_defio_fillrect+0x38/0x144 drivers/gpu/drm/drm_fbdev_shmem.c:39 bit_clear+0x134/0x1cc drivers/video/fbdev/core/bitblit.c:72 __fbcon_clear+0x38c/0x648 drivers/video/fbdev/core/fbcon.c:1382 fbcon_scroll+0x270/0x464 drivers/video/fbdev/core/fbcon.c:-1 con_scroll+0x18c/0x330 drivers/tty/vt/vt.c:616 csi_M drivers/tty/vt/vt.c:2193 [inline] csi_ECMA+0xea8/0x3074 drivers/tty/vt/vt.c:2616 do_con_trol drivers/tty/vt/vt.c:-1 [inline] do_con_write+0x3184/0x426c drivers/tty/vt/vt.c:3328 con_put_char+0x8c/0xd0 drivers/tty/vt/vt.c:3672 tty_put_char+0xcc/0x148 drivers/tty/tty_io.c:3144 do_output_char+0x504/0x7a4 drivers/tty/n_tty.c:459 process_output drivers/tty/n_tty.c:482 [inline] n_tty_write+0xa20/0xd90 drivers/tty/n_tty.c:2377 iterate_tty_write drivers/tty/tty_io.c:1008 [inline] file_tty_write+0x3dc/0x66c drivers/tty/tty_io.c:1056 tty_write+0x44/0x54 drivers/tty/tty_io.c:1077 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x51c/0xa0c fs/read_write.c:687 ksys_write+0x12c/0x228 fs/read_write.c:739 __do_sys_write fs/read_write.c:750 [inline] __se_sys_write fs/read_write.c:747 [inline] __arm64_sys_write+0x84/0x98 fs/read_write.c:747 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606 The buggy address belongs to a 0-page vmalloc region starting at 0xffff800093b19000 allocated at drm_gem_shmem_vmap_locked+0x45c/0x690 drivers/gpu/drm/drm_gem_shmem_helper.c:415 Memory state around the buggy address: ffff800093e18f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ffff800093e18f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 >ffff800093e19000: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ^ ffff800093e19080: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ffff800093e19100: f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 ================================================================== Unable to handle kernel paging request at virtual address ffff800093e19000 KASAN: probably user-memory-access in range [0x000000049f0c8000-0x000000049f0c8007] Mem abort info: ESR = 0x0000000096000047 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x07: level 3 translation fault Data abort info: ISV = 0, ISS = 0x00000047, ISS2 = 0x00000000 CM = 0, WnR = 1, TnD = 0, TagAccess = 0 GCS = 0, Overlay = 0, DirtyBit = 0 swapper pgtable: 4k pages, 48-bit VAs, pgdp=00000002196a1000 [ffff800093e19000] pgd=0000000000000000, p4d=100000021f9b7003, pud=100000021f9b8003, pmd=1000000107376403, pte=0000000000000000 Internal error: Oops: 0000000096000047 [#1] SMP Modules linked in: CPU: 1 UID: 0 PID: 9283 Comm: syz.5.874 Tainted: G B L syzkaller #0 PREEMPT Tainted: [B]=BAD_PAGE, [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/23/2026 pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) pc : fb_write_offset drivers/video/fbdev/core/sysmem.h:30 [inline] pc : bitfill drivers/video/fbdev/core/fb_fillrect.h:133 [inline] pc : fb_fillrect_static drivers/video/fbdev/core/fb_fillrect.h:219 [inline] pc : fb_fillrect drivers/video/fbdev/core/fb_fillrect.h:278 [inline] pc : sys_fillrect+0x16b8/0x1aac drivers/video/fbdev/core/sysfillrect.c:24 lr : fb_write_offset drivers/video/fbdev/core/sysmem.h:30 [inline] lr : bitfill drivers/video/fbdev/core/fb_fillrect.h:133 [inline] lr : fb_fillrect_static drivers/video/fbdev/core/fb_fillrect.h:219 [inline] lr : fb_fillrect drivers/video/fbdev/core/fb_fillrect.h:278 [inline] lr : sys_fillrect+0x16b4/0x1aac drivers/video/fbdev/core/sysfillrect.c:24 sp : ffff800093e36fe0 x29: ffff800093e37020 x28: ffffffffffffffff x27: ffff800093e19000 x26: 0000000000000004 x25: 0000000000000180 x24: 0000000000000004 x23: 0000000000000100 x22: 0000000000000000 x21: 0000000000000000 x20: ffff800093e19000 x19: dfff800000000000 x18: 0000000000000000 x17: 3d3d3d3d3d3d3d3d x16: 3d3d3d3d3d3d3d3d x15: 3d3d3d3d3d3d3d3d x14: 0000000000004fbc x13: 0000000000000001 x12: 0000000000000000 x11: 0000000000000000 x10: 0000000000080000 x9 : 0000000000000000 x8 : ffff000122e79d80 x7 : 0000000000000000 x6 : ffff800080482944 x5 : 0000000000000000 x4 : 0000000000000000 x3 : ffff8000802f310c x2 : 0000000000000000 x1 : ffff000122e79d80 x0 : ffff800093e19000 Call trace: fb_write_offset drivers/video/fbdev/core/sysmem.h:30 [inline] (P) bitfill drivers/video/fbdev/core/fb_fillrect.h:133 [inline] (P) fb_fillrect_static drivers/video/fbdev/core/fb_fillrect.h:219 [inline] (P) fb_fillrect drivers/video/fbdev/core/fb_fillrect.h:278 [inline] (P) sys_fillrect+0x16b8/0x1aac drivers/video/fbdev/core/sysfillrect.c:24 (P) drm_fbdev_shmem_defio_fillrect+0x38/0x144 drivers/gpu/drm/drm_fbdev_shmem.c:39 bit_clear+0x134/0x1cc drivers/video/fbdev/core/bitblit.c:72 __fbcon_clear+0x38c/0x648 drivers/video/fbdev/core/fbcon.c:1382 fbcon_scroll+0x270/0x464 drivers/video/fbdev/core/fbcon.c:-1 con_scroll+0x18c/0x330 drivers/tty/vt/vt.c:616 csi_M drivers/tty/vt/vt.c:2193 [inline] csi_ECMA+0xea8/0x3074 drivers/tty/vt/vt.c:2616 do_con_trol drivers/tty/vt/vt.c:-1 [inline] do_con_write+0x3184/0x426c drivers/tty/vt/vt.c:3328 con_put_char+0x8c/0xd0 drivers/tty/vt/vt.c:3672 tty_put_char+0xcc/0x148 drivers/tty/tty_io.c:3144 do_output_char+0x504/0x7a4 drivers/tty/n_tty.c:459 process_output drivers/tty/n_tty.c:482 [inline] n_tty_write+0xa20/0xd90 drivers/tty/n_tty.c:2377 iterate_tty_write drivers/tty/tty_io.c:1008 [inline] file_tty_write+0x3dc/0x66c drivers/tty/tty_io.c:1056 tty_write+0x44/0x54 drivers/tty/tty_io.c:1077 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x51c/0xa0c fs/read_write.c:687 ksys_write+0x12c/0x228 fs/read_write.c:739 __do_sys_write fs/read_write.c:750 [inline] __se_sys_write fs/read_write.c:747 [inline] __arm64_sys_write+0x84/0x98 fs/read_write.c:747 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x244 arch/arm64/kernel/syscall.c:49 el0_svc_common+0xec/0x23c arch/arm64/kernel/syscall.c:121 do_el0_svc+0x4c/0x5c arch/arm64/kernel/syscall.c:140 el0_svc+0x60/0x1d8 arch/arm64/kernel/entry-common.c:796 el0t_64_sync_handler+0x44/0x104 arch/arm64/kernel/entry-common.c:815 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:606 Code: 34000068 aa1b03e0 97b7c119 aa1b03e0 (f8008415) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 34000068 cbz w8, 0xc 4: aa1b03e0 mov x0, x27 8: 97b7c119 bl 0xfffffffffedf046c c: aa1b03e0 mov x0, x27 * 10: f8008415 str x21, [x0], #8 <-- trapping instruction