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Tue, 17 Mar 2026 13:39:24 -0700 (PDT) Date: Tue, 17 Mar 2026 13:39:24 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <69b9bbfc.050a0220.248e02.0151.GAE@google.com> Subject: [syzbot] [kernel?] WARNING in exit_mm From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: b84a0ebe421c Add linux-next specific files for 20260313 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=15fb1602580000 kernel config: https://syzkaller.appspot.com/x/.config?x=e7280ad1f68b2dce dashboard link: https://syzkaller.appspot.com/bug?extid=295a8715dd1bfadef8bf compiler: Debian clang version 21.1.8 (++20251221033036+2078da43e25a-1~exp1~20251221153213.50), Debian LLD 21.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=177918ba580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/09145161a8a9/disk-b84a0ebe.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/b64c254e474c/vmlinux-b84a0ebe.xz kernel image: https://storage.googleapis.com/syzbot-assets/a7c33f5f7f45/bzImage-b84a0ebe.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+295a8715dd1bfadef8bf@syzkaller.appspotmail.com ------------[ cut here ]------------ DEBUG_RWSEMS_WARN_ON(tmp < 0): count = 0xfffffffffffffffe, magic = 0xffff8880369e4150, owner = 0x1, curr 0xffff88801f7f8000, list not empty WARNING: kernel/locking/rwsem.c:1389 at __up_read+0x307/0x6b0 kernel/locking/rwsem.c:1389, CPU#0: syz.0.17/5989 Modules linked in: CPU: 0 UID: 0 PID: 5989 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 RIP: 0010:__up_read+0x3f5/0x6b0 kernel/locking/rwsem.c:1389 Code: 8b 49 c7 c2 e0 f3 ec 8b 4c 0f 44 d0 48 8b 7c 24 38 48 c7 c6 60 f6 ec 8b 48 8b 54 24 30 4c 89 f1 4d 89 f8 4c 8b 4c 24 28 41 52 <67> 48 0f b9 3a 48 83 c4 08 e8 0d 23 15 03 e9 72 fe ff ff 48 8d 1d RSP: 0018:ffffc90004577c18 EFLAGS: 00010246 RAX: ffffffff8becf400 RBX: ffff8880369e41a8 RCX: ffff8880369e4150 RDX: fffffffffffffffe RSI: ffffffff8becf660 RDI: ffffffff90579f10 RBP: ffffc90004577cf0 R08: 0000000000000001 R09: ffff88801f7f8000 R10: ffffffff8becf400 R11: ffffed1006d3c82c R12: fffffffffffffffe R13: 1ffff920008aef8c R14: ffff8880369e4150 R15: 0000000000000001 FS: 0000000000000000(0000) GS:ffff888124de0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f7e9c747e20 CR3: 0000000078264000 CR4: 00000000003526f0 Call Trace: mmap_read_unlock include/linux/mmap_lock.h:619 [inline] exit_mm+0x17e/0x250 kernel/exit.c:579 do_exit+0x8b9/0x2490 kernel/exit.c:962 do_group_exit+0x21b/0x2d0 kernel/exit.c:1116 __do_sys_exit_group kernel/exit.c:1127 [inline] __se_sys_exit_group kernel/exit.c:1125 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1125 x64_sys_call+0x221a/0x2240 arch/x86/include/generated/asm/syscalls_64.h:232 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7e9b99c799 Code: Unable to access opcode bytes at 0x7f7e9b99c76f. RSP: 002b:00007ffca98be868 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f7e9b99c799 RDX: 0000000000000064 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000003 R08: 0000000000000000 R09: 00007f7e9bbe63e0 R10: 0000000000000006 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f7e9bbe63e0 R14: 0000000000000003 R15: 00007ffca98be920 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 49 c7 c2 e0 f3 ec 8b mov $0xffffffff8becf3e0,%r10 7: 4c 0f 44 d0 cmove %rax,%r10 b: 48 8b 7c 24 38 mov 0x38(%rsp),%rdi 10: 48 c7 c6 60 f6 ec 8b mov $0xffffffff8becf660,%rsi 17: 48 8b 54 24 30 mov 0x30(%rsp),%rdx 1c: 4c 89 f1 mov %r14,%rcx 1f: 4d 89 f8 mov %r15,%r8 22: 4c 8b 4c 24 28 mov 0x28(%rsp),%r9 27: 41 52 push %r10 * 29: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2e: 48 83 c4 08 add $0x8,%rsp 32: e8 0d 23 15 03 call 0x3152344 37: e9 72 fe ff ff jmp 0xfffffeae 3c: 48 rex.W 3d: 8d .byte 0x8d 3e: 1d .byte 0x1d --- 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