Hello, syzbot found the following issue on: HEAD commit: 1fda5bb66ad8 bpf: Do not allocate percpu memory at init st.. git tree: bpf console+strace: https://syzkaller.appspot.com/x/log.txt?x=12d99420e80000 kernel config: https://syzkaller.appspot.com/x/.config?x=2ae0ccd6bfde5eb0 dashboard link: https://syzkaller.appspot.com/bug?extid=72aa0161922eba61b50e compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16dff22f680000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1027dc70e80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/3e24d257ce8d/disk-1fda5bb6.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/eaa9caffb0e4/vmlinux-1fda5bb6.xz kernel image: https://storage.googleapis.com/syzbot-assets/16182bbed726/bzImage-1fda5bb6.xz The issue was bisected to: commit ca247283781d754216395a41c5e8be8ec79a5f1c Author: Andy Lutomirski <luto@xxxxxxxxxx> Date: Wed Feb 10 02:33:45 2021 +0000 x86/fault: Don't run fixups for SMAP violations bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=103d92db680000 final oops: https://syzkaller.appspot.com/x/report.txt?x=123d92db680000 console output: https://syzkaller.appspot.com/x/log.txt?x=143d92db680000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+72aa0161922eba61b50e@xxxxxxxxxxxxxxxxxxxxxxxxx Fixes: ca247283781d ("x86/fault: Don't run fixups for SMAP violations") BUG: unable to handle page fault for address: ffffffffff600000 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD cd7a067 P4D cd7a067 PUD cd7c067 PMD cd9f067 PTE 0 Oops: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 5071 Comm: syz-executor322 Not tainted 6.6.0-syzkaller-15867-g1fda5bb66ad8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 RIP: 0010:copy_from_kernel_nofault mm/maccess.c:36 [inline] RIP: 0010:copy_from_kernel_nofault+0x86/0x240 mm/maccess.c:24 Code: ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 ab 01 00 00 41 83 85 6c 17 00 00 01 eb 1e e8 ba 23 cf ff <48> 8b 45 00 49 89 04 24 48 83 c5 08 49 83 c4 08 48 83 eb 08 e8 a1 RSP: 0018:ffffc900038d7ae8 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000008 RCX: ffffffff81b8690c RDX: ffff888016ab0000 RSI: ffffffff81b868e6 RDI: 0000000000000007 RBP: ffffffffff600000 R08: 0000000000000007 R09: 0000000000000007 R10: 0000000000000008 R11: 0000000000000001 R12: ffffc900038d7b30 R13: ffff888016ab0000 R14: dffffc0000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600000 CR3: 000000000cd77000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> bpf_probe_read_kernel_common include/linux/bpf.h:2747 [inline] ____bpf_probe_read_kernel kernel/trace/bpf_trace.c:236 [inline] bpf_probe_read_kernel+0x26/0x70 kernel/trace/bpf_trace.c:233 bpf_prog_bd8b22826c103b08+0x42/0x44 bpf_dispatcher_nop_func include/linux/bpf.h:1196 [inline] __bpf_prog_run include/linux/filter.h:651 [inline] bpf_prog_run include/linux/filter.h:658 [inline] __bpf_trace_run kernel/trace/bpf_trace.c:2307 [inline] bpf_trace_run2+0x14e/0x410 kernel/trace/bpf_trace.c:2346 trace_kfree include/trace/events/kmem.h:94 [inline] kfree+0xec/0x150 mm/slab_common.c:1043 vma_numab_state_free include/linux/mm.h:638 [inline] __vm_area_free+0x3e/0x140 kernel/fork.c:525 remove_vma+0x128/0x170 mm/mmap.c:146 exit_mmap+0x453/0xa70 mm/mmap.c:3332 __mmput+0x12a/0x4d0 kernel/fork.c:1349 mmput+0x62/0x70 kernel/fork.c:1371 exit_mm kernel/exit.c:567 [inline] do_exit+0x9ad/0x2ae0 kernel/exit.c:858 do_group_exit+0xd4/0x2a0 kernel/exit.c:1021 __do_sys_exit_group kernel/exit.c:1032 [inline] __se_sys_exit_group kernel/exit.c:1030 [inline] __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1030 do_syscall_x64 arch/x86/entry/common.c:51 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7fe1c24c2dc9 Code: Unable to access opcode bytes at 0x7fe1c24c2d9f. RSP: 002b:00007ffd4d4b8dc8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fe1c24c2dc9 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 00007fe1c253e290 R08: ffffffffffffffb8 R09: 0000000000000006 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fe1c253e290 R13: 0000000000000000 R14: 00007fe1c253ece0 R15: 00007fe1c2494030 </TASK> Modules linked in: CR2: ffffffffff600000 ---[ end trace 0000000000000000 ]--- RIP: 0010:copy_from_kernel_nofault mm/maccess.c:36 [inline] RIP: 0010:copy_from_kernel_nofault+0x86/0x240 mm/maccess.c:24 Code: ea 03 0f b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 ab 01 00 00 41 83 85 6c 17 00 00 01 eb 1e e8 ba 23 cf ff <48> 8b 45 00 49 89 04 24 48 83 c5 08 49 83 c4 08 48 83 eb 08 e8 a1 RSP: 0018:ffffc900038d7ae8 EFLAGS: 00010293 RAX: 0000000000000000 RBX: 0000000000000008 RCX: ffffffff81b8690c RDX: ffff888016ab0000 RSI: ffffffff81b868e6 RDI: 0000000000000007 RBP: ffffffffff600000 R08: 0000000000000007 R09: 0000000000000007 R10: 0000000000000008 R11: 0000000000000001 R12: ffffc900038d7b30 R13: ffff888016ab0000 R14: dffffc0000000000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: ffffffffff600000 CR3: 000000000cd77000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 03 0f add (%rdi),%ecx 2: b6 14 mov $0x14,%dh 4: 02 48 89 add -0x77(%rax),%cl 7: f8 clc 8: 83 e0 07 and $0x7,%eax b: 83 c0 03 add $0x3,%eax e: 38 d0 cmp %dl,%al 10: 7c 08 jl 0x1a 12: 84 d2 test %dl,%dl 14: 0f 85 ab 01 00 00 jne 0x1c5 1a: 41 83 85 6c 17 00 00 addl $0x1,0x176c(%r13) 21: 01 22: eb 1e jmp 0x42 24: e8 ba 23 cf ff call 0xffcf23e3 * 29: 48 8b 45 00 mov 0x0(%rbp),%rax <-- trapping instruction 2d: 49 89 04 24 mov %rax,(%r12) 31: 48 83 c5 08 add $0x8,%rbp 35: 49 83 c4 08 add $0x8,%r12 39: 48 83 eb 08 sub $0x8,%rbx 3d: e8 .byte 0xe8 3e: a1 .byte 0xa1 --- 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. For information about bisection process see: https://goo.gl/tpsmEJ#bisection 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
