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Message-ID: <68fc15d5.050a0220.346f24.01a4.GAE@google.com> Date: Fri, 24 Oct 2025 17:12:05 -0700 From: syzbot <syzbot+2479e53d0db9b32ae2aa@...kaller.appspotmail.com> To: hdanton@...a.com, kvm@...r.kernel.org, linux-kernel@...r.kernel.org, seanjc@...gle.com, syzkaller-bugs@...glegroups.com, tabba@...gle.com, xiaoyao.li@...el.com Subject: Re: [syzbot] [kvm?] KASAN: slab-use-after-free Write in kvm_gmem_release Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: WARNING in get_data ------------[ cut here ]------------ WARNING: kernel/printk/printk_ringbuffer.c:1278 at get_data+0x48a/0x840 kernel/printk/printk_ringbuffer.c:1278, CPU#1: udevd/5199 Modules linked in: CPU: 1 UID: 0 PID: 5199 Comm: udevd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:get_data+0x48a/0x840 kernel/printk/printk_ringbuffer.c:1278 Code: 83 c4 f8 48 b8 00 00 00 00 00 fc ff df 41 0f b6 04 07 84 c0 0f 85 ee 01 00 00 44 89 65 00 49 83 c5 08 eb 13 e8 57 cd 1e 00 90 <0f> 0b 90 eb 05 e8 4c cd 1e 00 45 31 ed 4c 89 e8 48 83 c4 28 5b 41 RSP: 0018:ffffc90000a08560 EFLAGS: 00010006 RAX: ffffffff81a16c59 RBX: 00003fffffffffff RCX: ffff88807e471e40 RDX: 0000000000010000 RSI: 00003fffffffffff RDI: 0000000000000000 RBP: 0000000000000012 R08: 0000000000001005 R09: 0000002047c57766 R10: 0000002047c57766 R11: 0000196a8200002e R12: 0000000000000012 R13: 0000000000000000 R14: ffffc90000a086a8 R15: 1ffffffff1bcaa96 FS: 00007fa682a1a880(0000) GS:ffff888126022000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30c63fff CR3: 000000007e4be000 CR4: 00000000003526f0 Call Trace: <IRQ> copy_data kernel/printk/printk_ringbuffer.c:1857 [inline] prb_read kernel/printk/printk_ringbuffer.c:1966 [inline] _prb_read_valid+0x672/0xa90 kernel/printk/printk_ringbuffer.c:2143 prb_read_valid+0x3c/0x60 kernel/printk/printk_ringbuffer.c:2215 printk_get_next_message+0x15c/0x7b0 kernel/printk/printk.c:2978 console_emit_next_record kernel/printk/printk.c:3065 [inline] console_flush_one_record kernel/printk/printk.c:3197 [inline] console_flush_all+0x4cc/0xb10 kernel/printk/printk.c:3271 __console_flush_and_unlock kernel/printk/printk.c:3301 [inline] console_unlock+0xbb/0x190 kernel/printk/printk.c:3341 wake_up_klogd_work_func+0xa8/0x130 kernel/printk/printk.c:4550 irq_work_single+0xe1/0x240 kernel/irq_work.c:221 irq_work_run_list kernel/irq_work.c:252 [inline] irq_work_tick+0x2c2/0x360 kernel/irq_work.c:277 update_process_times+0x264/0x2f0 kernel/time/timer.c:2476 tick_sched_handle kernel/time/tick-sched.c:276 [inline] tick_nohz_handler+0x39a/0x520 kernel/time/tick-sched.c:297 __run_hrtimer kernel/time/hrtimer.c:1777 [inline] __hrtimer_run_queues+0x4e0/0xc60 kernel/time/hrtimer.c:1841 hrtimer_interrupt+0x45b/0xaa0 kernel/time/hrtimer.c:1903 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline] __sysvec_apic_timer_interrupt+0x10b/0x410 arch/x86/kernel/apic/apic.c:1058 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1052 [inline] sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1052 </IRQ> <TASK> asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:__sanitizer_cov_trace_cmp4+0x4/0x90 kernel/kcov.c:288 Code: 89 74 11 18 48 89 44 11 20 e9 48 ca 8b 09 cc 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <48> 8b 04 24 65 48 8b 14 25 08 e0 6f 92 65 8b 0d a8 a4 af 10 81 e1 RSP: 0018:ffffc900030e7d00 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000040 RCX: 0000000000000000 RDX: ffff88807e471e40 RSI: 0000000000000040 RDI: 000000000000000c RBP: 000000000000000c R08: 0000000000000003 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff5200061cf90 R12: ffff88807ea4d320 R13: dffffc0000000000 R14: ffff88807ea4d3c0 R15: 0000000000000000 alloc_fd+0x2f3/0x6c0 fs/file.c:595 do_sys_openat2+0xfc/0x1c0 fs/open.c:1435 do_sys_open fs/open.c:1452 [inline] __do_sys_openat fs/open.c:1468 [inline] __se_sys_openat fs/open.c:1463 [inline] __x64_sys_openat+0x138/0x170 fs/open.c:1463 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa6822a7407 Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff RSP: 002b:00007fffd29370d0 EFLAGS: 00000202 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fa682a1a880 RCX: 00007fa6822a7407 RDX: 0000000000080000 RSI: 00007fffd2937250 RDI: ffffffffffffff9c RBP: 0000000000000008 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000202 R12: 00005600f32347f5 R13: 00005600f32347f5 R14: 0000000000000001 R15: 0000000000000000 </TASK> ---------------- Code disassembly (best guess): 0: 89 74 11 18 mov %esi,0x18(%rcx,%rdx,1) 4: 48 89 44 11 20 mov %rax,0x20(%rcx,%rdx,1) 9: e9 48 ca 8b 09 jmp 0x98bca56 e: cc int3 f: 0f 1f 80 00 00 00 00 nopl 0x0(%rax) 16: 90 nop 17: 90 nop 18: 90 nop 19: 90 nop 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 90 nop 1e: 90 nop 1f: 90 nop 20: 90 nop 21: 90 nop 22: 90 nop 23: 90 nop 24: 90 nop 25: 90 nop 26: f3 0f 1e fa endbr64 * 2a: 48 8b 04 24 mov (%rsp),%rax <-- trapping instruction 2e: 65 48 8b 14 25 08 e0 mov %gs:0xffffffff926fe008,%rdx 35: 6f 92 37: 65 8b 0d a8 a4 af 10 mov %gs:0x10afa4a8(%rip),%ecx # 0x10afa4e6 3e: 81 .byte 0x81 3f: e1 .byte 0xe1 Tested on: commit: 72fb0170 Add linux-next specific files for 20251024 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=14b2e3cd980000 kernel config: https://syzkaller.appspot.com/x/.config?x=bcaf4aad77308158 dashboard link: https://syzkaller.appspot.com/bug?extid=2479e53d0db9b32ae2aa compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 patch: https://syzkaller.appspot.com/x/patch.diff?x=13d98be2580000
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