linux-kernel - [syzbot] [bpf?] WARNING in trace_suspend

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Message-ID: <688b8332.a00a0220.26d0e1.0044.GAE@google.com>
Date: Thu, 31 Jul 2025 07:52:34 -0700
From: syzbot <syzbot+99d4fec338b62b703891@...kaller.appspotmail.com>
To: akpm@...ux-foundation.org, andrii@...nel.org, ast@...nel.org, 
	bpf@...r.kernel.org, daniel@...earbox.net, linux-kernel@...r.kernel.org, 
	linux-mm@...ck.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [bpf?] WARNING in trace_suspend_resume

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@...kaller.appspotmail.com

------------[ 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..


---
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