Hello, syzbot found the following issue on: HEAD commit: 260f6f4fda93 Merge tag 'drm-next-2025-07-30' of https://gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=102f69bc580000 kernel config: https://syzkaller.appspot.com/x/.config?x=af26dbd5a30735 dashboard link: https://syzkaller.appspot.com/bug?extid=99d4fec338b62b703891 compiler: arm-linux-gnueabi-gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: arm Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/98a89b9f34e4/non_bootable_disk-260f6f4f.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/091b40479433/vmlinux-260f6f4f.xz kernel image: https://storage.googleapis.com/syzbot-assets/54ef37cd1da7/zImage-260f6f4f.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+99d4fec338b62b703891@xxxxxxxxxxxxxxxxxxxxxxxxx ------------[ cut here ]------------ WARNING: CPU: 0 PID: 4102 at mm/highmem.c:622 kunmap_local_indexed+0x20c/0x224 mm/highmem.c:622 Modules linked in: Kernel panic - not syncing: kernel: panic_on_warn set ... CPU: 0 UID: 0 PID: 4102 Comm: syz.0.84 Not tainted 6.16.0-syzkaller #0 PREEMPT Hardware name: ARM-Versatile Express Call trace: [<80201a24>] (dump_backtrace) from [<80201b20>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257) r7:00000000 r6:8281f77c r5:00000000 r4:8224af5c [<80201b08>] (show_stack) from [<8021faf0>] (__dump_stack lib/dump_stack.c:94 [inline]) [<80201b08>] (show_stack) from [<8021faf0>] (dump_stack_lvl+0x54/0x7c lib/dump_stack.c:120) [<8021fa9c>] (dump_stack_lvl) from [<8021fb30>] (dump_stack+0x18/0x1c lib/dump_stack.c:129) r5:00000000 r4:82a6bd18 [<8021fb18>] (dump_stack) from [<80202624>] (vpanic+0x10c/0x360 kernel/panic.c:440) [<80202518>] (vpanic) from [<802028ac>] (trace_suspend_resume+0x0/0xd8 kernel/panic.c:574) r7:804bdb5c [<80202878>] (panic) from [<802548dc>] (check_panic_on_warn kernel/panic.c:333 [inline]) [<80202878>] (panic) from [<802548dc>] (get_taint+0x0/0x1c kernel/panic.c:328) r3:8280c684 r2:00000001 r1:82231a24 r0:822393ec [<80254868>] (check_panic_on_warn) from [<80254a40>] (__warn+0x80/0x188 kernel/panic.c:845) [<802549c0>] (__warn) from [<80254cc0>] (warn_slowpath_fmt+0x178/0x1f4 kernel/panic.c:872) r8:00000009 r7:82265508 r6:df9f9d1c r5:83a93000 r4:00000000 [<80254b4c>] (warn_slowpath_fmt) from [<804bdb5c>] (kunmap_local_indexed+0x20c/0x224 mm/highmem.c:622) r10:00000000 r9:deb56a18 r8:debb2f48 r7:00a00000 r6:00000003 r5:83a93000 r4:ffefd000 [<804bd950>] (kunmap_local_indexed) from [<80538be4>] (__kunmap_local include/linux/highmem-internal.h:102 [inline]) [<804bd950>] (kunmap_local_indexed) from [<80538be4>] (move_pages_pte mm/userfaultfd.c:1457 [inline]) [<804bd950>] (kunmap_local_indexed) from [<80538be4>] (move_pages+0xb24/0x19c8 mm/userfaultfd.c:1868) r7:00a00000 r6:00000000 r5:846e9ec4 r4:84add6c0 [<805380c0>] (move_pages) from [<805c02ec>] (userfaultfd_move fs/userfaultfd.c:1914 [inline]) [<805380c0>] (move_pages) from [<805c02ec>] (userfaultfd_ioctl+0xff8/0x21c4 fs/userfaultfd.c:2037) r10:84add6c0 r9:df9f9e98 r8:21000000 r7:00000001 r6:00000000 r5:20000040 r4:85955000 [<805bf2f4>] (userfaultfd_ioctl) from [<80568ccc>] (vfs_ioctl fs/ioctl.c:51 [inline]) [<805bf2f4>] (userfaultfd_ioctl) from [<80568ccc>] (do_vfs_ioctl fs/ioctl.c:552 [inline]) [<805bf2f4>] (userfaultfd_ioctl) from [<80568ccc>] (__do_sys_ioctl fs/ioctl.c:596 [inline]) [<805bf2f4>] (userfaultfd_ioctl) from [<80568ccc>] (sys_ioctl+0x130/0xba0 fs/ioctl.c:584) r10:83a93000 r9:00000003 r8:85935840 r7:20000040 r6:85935841 r5:00000000 r4:c028aa05 [<80568b9c>] (sys_ioctl) from [<80200060>] (ret_fast_syscall+0x0/0x1c arch/arm/mm/proc-v7.S:67) Exception stack(0xdf9f9fa8 to 0xdf9f9ff0) 9fa0: 00000000 00000000 00000003 c028aa05 20000040 00000000 9fc0: 00000000 00000000 002f6300 00000036 002e0000 00000000 00006364 76b450bc 9fe0: 76b44ec0 76b44eb0 000193a4 00131fc0 r10:00000036 r9:83a93000 r8:8020029c r7:00000036 r6:002f6300 r5:00000000 r4:00000000 Rebooting in 86400 seconds.. --- 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@xxxxxxxxxxxxxxxx. 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
