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AJvYcCV/+8W1Ox7eRNz64gleLRn3JfE6tUAUdlzb2IO91awsF7W4ci0l7Vn004Sdt0YQDJvmx8a7rvebUz/jbrs=@vger.kernel.org X-Gm-Message-State: AOJu0YwfI33ai8ofYZbgaYcocyB/FGR114LBssaaqewl1CVNiVA213e5 0gbmggCfzglk++/sMQWx2ID6GFHJyqeg7N7vYgLSO5kHAeYCWNIG0Tq0zOhrHQEq2OQeu5AT7wy JkBA3kPJx5uN3bBot2jRd+XKWKuFqa33ZcYgzqbpMnL769BoNfdPg9BZTr68= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:198a:b0:65f:cda0:ed8f with SMTP id 006d021491bc7-66d0a95990amr6320115eaf.35.1770696508128; Mon, 09 Feb 2026 20:08:28 -0800 (PST) Date: Mon, 09 Feb 2026 20:08:28 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <698aaf3c.050a0220.3b3015.0088.GAE@google.com> Subject: [syzbot] [kernel?] WARNING in __mmdrop (2) From: syzbot To: andrealmeid@igalia.com, dave@stgolabs.net, dvhart@infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, peterz@infradead.org, syzkaller-bugs@googlegroups.com, tglx@kernel.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 05f7e89ab973 Linux 6.19 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1153465a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=df890e720d1bb80 dashboard link: https://syzkaller.appspot.com/bug?extid=237b5b985b78c1da9600 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=105297fa580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=120c12e6580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/ea9f39c5175d/disk-05f7e89a.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/734edeebfa32/vmlinux-05f7e89a.xz kernel image: https://storage.googleapis.com/syzbot-assets/a2cb36d849f0/bzImage-05f7e89a.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+237b5b985b78c1da9600@syzkaller.appspotmail.com ------------[ cut here ]------------ mm == current->mm WARNING: kernel/fork.c:720 at __mmdrop+0x5de/0x750 kernel/fork.c:720, CPU#0: syz.0.19/6013 Modules linked in: CPU: 0 UID: 0 PID: 6013 Comm: syz.0.19 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:__mmdrop+0x5de/0x750 kernel/fork.c:720 Code: 00 90 0f 0b e8 93 ef 41 00 90 0f 0b 90 e9 e9 fa ff ff e8 85 ef 41 00 48 89 df e8 dd 44 a9 00 e9 c0 fb ff ff e8 73 ef 41 00 90 <0f> 0b 90 e9 85 fa ff ff e8 65 ef 41 00 90 0f 0b 90 e9 5f fb ff ff RSP: 0018:ffffc90003baf8f8 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff88807aa93d40 RCX: ffffffff81d3fa45 RDX: ffff888078f73d00 RSI: ffffffff81c45eed RDI: ffff888078f74298 RBP: ffffc90003baf990 R08: 0000000000000001 R09: ffffed100f5527a8 R10: ffff88807aa93d43 R11: 0000000000000000 R12: ffff888078f73d00 R13: ffff888032e75b80 R14: ffff888032e75b80 R15: ffff8880b843bbf0 FS: 00007f9eec7116c0(0000) GS:ffff8881245e2000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2fa63fff CR3: 000000007623e000 CR4: 00000000003526f0 Call Trace: mmdrop include/linux/sched/mm.h:55 [inline] mmdrop_sched include/linux/sched/mm.h:83 [inline] mmdrop_lazy_tlb_sched include/linux/sched/mm.h:110 [inline] finish_task_switch.isra.0+0x76e/0xb70 kernel/sched/core.c:5143 context_switch kernel/sched/core.c:5263 [inline] __schedule+0xfee/0x5fa0 kernel/sched/core.c:6867 preempt_schedule_common+0x42/0xc0 kernel/sched/core.c:7051 preempt_schedule_thunk+0x16/0x30 arch/x86/entry/thunk.S:12 class_preempt_destructor include/linux/preempt.h:468 [inline] try_to_wake_up+0x644/0x1a60 kernel/sched/core.c:4070 wake_up_process kernel/sched/core.c:4349 [inline] wake_up_q+0xa1/0x130 kernel/sched/core.c:1087 futex_wake+0x460/0x530 kernel/futex/waitwake.c:198 do_futex+0x32b/0x350 kernel/futex/syscalls.c:135 __do_sys_futex kernel/futex/syscalls.c:207 [inline] __se_sys_futex kernel/futex/syscalls.c:188 [inline] __x64_sys_futex+0x34f/0x4d0 kernel/futex/syscalls.c:188 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xc9/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9eeb79af79 Code: Unable to access opcode bytes at 0x7f9eeb79af4f. RSP: 002b:00007f9eec7110e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca RAX: ffffffffffffffda RBX: 00007f9eeba15fa8 RCX: 00007f9eeb79af79 RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f9eeba15fac RBP: 00007f9eeba15fa0 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007f9eeba16038 R14: 00007ffc9832d5e0 R15: 00007ffc9832d6c8 --- 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@googlegroups.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 syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. 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