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X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6992351f.050a0220.2757fb.0035.GAE@google.com> Subject: [syzbot] [cgroups?] general protection fault in rebuild_sched_domains_locked From: syzbot To: cgroups@vger.kernel.org, chenridong@huaweicloud.com, hannes@cmpxchg.org, linux-kernel@vger.kernel.org, longman@redhat.com, mkoutny@suse.com, syzkaller-bugs@googlegroups.com, tj@kernel.org Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: 37a93dd5c49b Merge tag 'net-next-7.0' of git://git.kernel... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1649d073980000 kernel config: https://syzkaller.appspot.com/x/.config?x=a512b4a06724b76a dashboard link: https://syzkaller.appspot.com/bug?extid=460792609a79c085f79f 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=152086e6580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=139c2eef980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/0dedaafff2ad/disk-37a93dd5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/aa7fae081497/vmlinux-37a93dd5.xz kernel image: https://storage.googleapis.com/syzbot-assets/9096b39b53e1/bzImage-37a93dd5.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+460792609a79c085f79f@syzkaller.appspotmail.com R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fe00de15fac R14: 00007fe00de15fa0 R15: 00007fe00de15fa0 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 UID: 0 PID: 5994 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:bitmap_subset include/linux/bitmap.h:433 [inline] RIP: 0010:cpumask_subset include/linux/cpumask.h:836 [inline] RIP: 0010:rebuild_sched_domains_locked+0x2aa/0x980 kernel/cgroup/cpuset.c:967 Code: 7d 05 00 41 83 c4 01 89 de 48 83 c5 08 44 89 e7 e8 fb 76 05 00 41 39 dc 0f 8d 4c 04 00 00 e8 fd 7c 05 00 48 89 e8 48 c1 e8 03 <42> 80 3c 30 00 0f 85 1d 06 00 00 48 8b 04 24 48 23 45 00 31 ff 44 RSP: 0018:ffffc90003ecfbc0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000020 RDX: ffff888028de0000 RSI: ffffffff8200f003 RDI: ffffffff8df14f28 RBP: 0000000000000000 R08: 0000000000000cc0 R09: 00000000ffffffff R10: ffffffff8e7d95b3 R11: 0000000000000001 R12: 0000000000000000 R13: 00000000000f4240 R14: dffffc0000000000 R15: 0000000000000000 FS: 000055555c694500(0000) GS:ffff8881246a5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2f463fff CR3: 000000003704c000 CR4: 00000000003526f0 Call Trace: rebuild_sched_domains_cpuslocked kernel/cgroup/cpuset.c:983 [inline] rebuild_sched_domains+0x21/0x40 kernel/cgroup/cpuset.c:990 sched_rt_handler+0xb5/0xe0 kernel/sched/rt.c:2911 proc_sys_call_handler+0x47f/0x5a0 fs/proc/proc_sysctl.c:600 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x6ac/0x1070 fs/read_write.c:688 ksys_write+0x12a/0x250 fs/read_write.c:740 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fe00db9bf79 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff27bcda88 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fe00de15fa0 RCX: 00007fe00db9bf79 RDX: 00000000000000f6 RSI: 0000200000000000 RDI: 0000000000000003 RBP: 00007fff27bcdaf0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fe00de15fac R14: 00007fe00de15fa0 R15: 00007fe00de15fa0 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:bitmap_subset include/linux/bitmap.h:433 [inline] RIP: 0010:cpumask_subset include/linux/cpumask.h:836 [inline] RIP: 0010:rebuild_sched_domains_locked+0x2aa/0x980 kernel/cgroup/cpuset.c:967 Code: 7d 05 00 41 83 c4 01 89 de 48 83 c5 08 44 89 e7 e8 fb 76 05 00 41 39 dc 0f 8d 4c 04 00 00 e8 fd 7c 05 00 48 89 e8 48 c1 e8 03 <42> 80 3c 30 00 0f 85 1d 06 00 00 48 8b 04 24 48 23 45 00 31 ff 44 RSP: 0018:ffffc90003ecfbc0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000020 RDX: ffff888028de0000 RSI: ffffffff8200f003 RDI: ffffffff8df14f28 RBP: 0000000000000000 R08: 0000000000000cc0 R09: 00000000ffffffff R10: ffffffff8e7d95b3 R11: 0000000000000001 R12: 0000000000000000 R13: 00000000000f4240 R14: dffffc0000000000 R15: 0000000000000000 FS: 000055555c694500(0000) GS:ffff8881246a5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b2f463fff CR3: 000000003704c000 CR4: 00000000003526f0 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 05 00 41 83 c4 add $0xc4834100,%eax 5: 01 89 de 48 83 c5 add %ecx,-0x3a7cb722(%rcx) b: 08 44 89 e7 or %al,-0x19(%rcx,%rcx,4) f: e8 fb 76 05 00 call 0x5770f 14: 41 39 dc cmp %ebx,%r12d 17: 0f 8d 4c 04 00 00 jge 0x469 1d: e8 fd 7c 05 00 call 0x57d1f 22: 48 89 e8 mov %rbp,%rax 25: 48 c1 e8 03 shr $0x3,%rax * 29: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) <-- trapping instruction 2e: 0f 85 1d 06 00 00 jne 0x651 34: 48 8b 04 24 mov (%rsp),%rax 38: 48 23 45 00 and 0x0(%rbp),%rax 3c: 31 ff xor %edi,%edi 3e: 44 rex.R --- 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