RBP: 00007f81e7637b70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f81e7826038 R14: 00007f81e7825fa0 R15: 00007fff2595be28 ------------[ cut here ]------------ failed to allocate ring buffer on CPU 1 WARNING: kernel/trace/ring_buffer.c:8095 at trace_rb_cpu_prepare+0x330/0x3c0 kernel/trace/ring_buffer.c:8094, CPU#0: syz.2.1338/9031 Modules linked in: CPU: 0 UID: 0 PID: 9031 Comm: syz.2.1338 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026 RIP: 0010:trace_rb_cpu_prepare+0x332/0x3c0 kernel/trace/ring_buffer.c:8094 Code: 08 f0 48 0f ab 03 31 c0 48 83 c4 30 5b 41 5c 41 5d 41 5e 41 5f 5d e9 4d 77 41 0a cc e8 87 21 fc ff 48 8d 3d 60 16 f5 0f 89 ee <67> 48 0f b9 3a b8 f4 ff ff ff eb d2 e8 6d 21 fc ff e9 ef fe ff ff RSP: 0018:ffffc9000398f7b0 EFLAGS: 00010287 RAX: ffffffff81cd1299 RBX: dffffc0000000000 RCX: 0000000000080000 RDX: ffffc90005ee9000 RSI: 0000000000000001 RDI: ffffffff91c22900 RBP: 0000000000000001 R08: ffffffff91be54bf R09: 1ffffffff237ca97 R10: dffffc0000000000 R11: fffffbfff237ca98 R12: 0000000000000000 R13: ffff88813fe49188 R14: ffff88807a8318a8 R15: 0000000000000000 FS: 00007f81e843e6c0(0000) GS:ffff8881233f0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000110c3d7269 CR3: 00000000783c2000 CR4: 00000000003526f0 Call Trace: cpuhp_invoke_callback+0x498/0x810 kernel/cpu.c:204 cpuhp_issue_call+0x3f0/0x750 kernel/cpu.c:-1 __cpuhp_state_add_instance_cpuslocked+0x225/0x560 kernel/cpu.c:2423 __cpuhp_state_add_instance+0x25/0x40 kernel/cpu.c:2444 cpuhp_state_add_instance include/linux/cpuhotplug.h:377 [inline] alloc_buffer+0x188f/0x1d70 kernel/trace/ring_buffer.c:2922 __ring_buffer_alloc+0x2c/0x40 kernel/trace/ring_buffer.c:2964 allocate_trace_buffer+0x1d2/0x950 kernel/trace/trace.c:8535 allocate_trace_buffers kernel/trace/trace.c:8568 [inline] trace_array_create_systems+0x590/0xe60 kernel/trace/trace.c:8746 trace_array_create kernel/trace/trace.c:8789 [inline] instance_mkdir+0xd5/0x140 kernel/trace/trace.c:8804 tracefs_syscall_mkdir+0x11a/0x190 fs/tracefs/inode.c:121 vfs_mkdir+0x411/0x660 fs/namei.c:5428 filename_mkdirat+0x284/0x550 fs/namei.c:5461 __do_sys_mkdirat fs/namei.c:5482 [inline] __se_sys_mkdirat+0x35/0x150 fs/namei.c:5479 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x16a/0x530 arch/x86/entry/syscall_64.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x00007f81e759fb19 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:00007f81e843e028 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f81e7825fa0 RCX: 00007f81e759fb19 RDX: 00000000000001ff RSI: 00002000000002c0 RDI: ffffffffffffff9c RBP: 00007f81e7637b70 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f81e7826038 R14: 00007f81e7825fa0 R15: 00007fff2595be28 ---------------- Code disassembly (best guess): 0: 08 f0 or %dh,%al 2: 48 0f ab 03 bts %rax,(%rbx) 6: 31 c0 xor %eax,%eax 8: 48 83 c4 30 add $0x30,%rsp c: 5b pop %rbx d: 41 5c pop %r12 f: 41 5d pop %r13 11: 41 5e pop %r14 13: 41 5f pop %r15 15: 5d pop %rbp 16: e9 4d 77 41 0a jmp 0xa417768 1b: cc int3 1c: e8 87 21 fc ff call 0xfffc21a8 21: 48 8d 3d 60 16 f5 0f lea 0xff51660(%rip),%rdi # 0xff51688 28: 89 ee mov %ebp,%esi * 2a: 67 48 0f b9 3a ud1 (%edx),%rdi <-- trapping instruction 2f: b8 f4 ff ff ff mov $0xfffffff4,%eax 34: eb d2 jmp 0x8 36: e8 6d 21 fc ff call 0xfffc21a8 3b: e9 ef fe ff ff jmp 0xffffff2f