[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 47.959445][ T27] audit: type=1800 audit(1579380065.981:25): pid=8382 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 47.993596][ T27] audit: type=1800 audit(1579380065.981:26): pid=8382 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 48.027757][ T27] audit: type=1800 audit(1579380065.981:27): pid=8382 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.201' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 59.273563][ C0] ================================================================== [ 59.281744][ C0] BUG: KASAN: slab-out-of-bounds in bitmap_ip_gc+0x140/0x4b0 [ 59.289095][ C0] Read of size 8 at addr ffff8880a5336bc0 by task swapper/0/0 [ 59.296525][ C0] [ 59.298841][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.5.0-rc6-syzkaller #0 [ 59.306704][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.316738][ C0] Call Trace: [ 59.320051][ C0] [ 59.322884][ C0] dump_stack+0x1fb/0x318 [ 59.327196][ C0] print_address_description+0x74/0x5c0 [ 59.332723][ C0] ? vprintk_default+0x28/0x30 [ 59.337467][ C0] ? vprintk_func+0x158/0x170 [ 59.342123][ C0] ? printk+0x62/0x8d [ 59.346145][ C0] __kasan_report+0x149/0x1c0 [ 59.350808][ C0] ? bitmap_ip_gc+0x140/0x4b0 [ 59.355467][ C0] kasan_report+0x26/0x50 [ 59.359780][ C0] check_memory_region+0x2b6/0x2f0 [ 59.364872][ C0] __kasan_check_read+0x11/0x20 [ 59.369701][ C0] bitmap_ip_gc+0x140/0x4b0 [ 59.374184][ C0] ? bitmap_ip_create+0xac0/0xac0 [ 59.379189][ C0] call_timer_fn+0x95/0x170 [ 59.383674][ C0] ? bitmap_ip_create+0xac0/0xac0 [ 59.388677][ C0] __run_timers+0x776/0x970 [ 59.393167][ C0] ? check_preemption_disabled+0x44/0x260 [ 59.398907][ C0] ? debug_smp_processor_id+0x9/0x20 [ 59.404203][ C0] run_timer_softirq+0x4a/0x90 [ 59.408957][ C0] __do_softirq+0x283/0x7bd [ 59.413442][ C0] ? irq_exit+0x227/0x230 [ 59.417745][ C0] irq_exit+0x227/0x230 [ 59.421884][ C0] smp_apic_timer_interrupt+0x113/0x280 [ 59.427413][ C0] apic_timer_interrupt+0xf/0x20 [ 59.432326][ C0] [ 59.435244][ C0] RIP: 0010:native_safe_halt+0x12/0x20 [ 59.440681][ C0] Code: 89 d9 80 e1 07 80 c1 03 38 c1 7c ba 48 89 df e8 94 c6 b5 f9 eb b0 cc cc 55 48 89 e5 e9 07 00 00 00 0f 00 2d a2 a8 45 00 fb f4 <5d> c3 66 90 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 e9 07 00 00 [ 59.460263][ C0] RSP: 0018:ffffffff89007db8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 59.468650][ C0] RAX: 1ffffffff1215238 RBX: ffffffff89075a00 RCX: dffffc0000000000 [ 59.476599][ C0] RDX: 0000000000000000 RSI: ffffffff812bf90a RDI: ffffffff89076244 [ 59.484584][ C0] RBP: ffffffff89007db8 R08: ffffffff89076258 R09: fffffbfff120eb41 [ 59.492534][ C0] R10: fffffbfff120eb41 R11: 0000000000000000 R12: 1ffffffff120eb40 [ 59.500487][ C0] R13: dffffc0000000000 R14: dffffc0000000000 R15: 1ffffffff1215236 [ 59.508465][ C0] ? arch_cpu_idle+0xa/0x10 [ 59.512944][ C0] default_idle+0x50/0x70 [ 59.517250][ C0] arch_cpu_idle+0xa/0x10 [ 59.521624][ C0] default_idle_call+0x59/0xa0 [ 59.526388][ C0] do_idle+0x1ec/0x630 [ 59.530430][ C0] ? debug_smp_processor_id+0x1c/0x20 [ 59.535776][ C0] cpu_startup_entry+0x25/0x30 [ 59.540515][ C0] rest_init+0x29d/0x2b0 [ 59.544731][ C0] arch_call_rest_init+0xe/0x10 [ 59.549568][ C0] start_kernel+0x6d1/0x7d2 [ 59.554052][ C0] x86_64_start_reservations+0x18/0x2e [ 59.559491][ C0] x86_64_start_kernel+0x7a/0x7d [ 59.564407][ C0] secondary_startup_64+0xa4/0xb0 [ 59.569419][ C0] [ 59.571730][ C0] Allocated by task 8533: [ 59.576039][ C0] __kasan_kmalloc+0x118/0x1c0 [ 59.580832][ C0] kasan_kmalloc+0x9/0x10 [ 59.585141][ C0] __kmalloc+0x254/0x340 [ 59.589389][ C0] kzalloc+0x21/0x40 [ 59.593267][ C0] ip_set_alloc+0x32/0x60 [ 59.597579][ C0] bitmap_ip_create+0x48b/0xac0 [ 59.602401][ C0] ip_set_create+0x421/0xfd0 [ 59.606970][ C0] nfnetlink_rcv_msg+0x9ae/0xcd0 [ 59.611879][ C0] netlink_rcv_skb+0x19e/0x3e0 [ 59.616614][ C0] nfnetlink_rcv+0x1e0/0x1e50 [ 59.621261][ C0] netlink_unicast+0x767/0x920 [ 59.625997][ C0] netlink_sendmsg+0xa2c/0xd50 [ 59.630730][ C0] ____sys_sendmsg+0x4f7/0x7f0 [ 59.635465][ C0] __sys_sendmsg+0x1ed/0x290 [ 59.640025][ C0] __x64_sys_sendmsg+0x7f/0x90 [ 59.644794][ C0] do_syscall_64+0xf7/0x1c0 [ 59.649307][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 59.655171][ C0] [ 59.657475][ C0] Freed by task 8276: [ 59.661427][ C0] __kasan_slab_free+0x12e/0x1e0 [ 59.666354][ C0] kasan_slab_free+0xe/0x10 [ 59.670840][ C0] kfree+0x10d/0x220 [ 59.674714][ C0] load_elf_binary+0x19b6/0x36d0 [ 59.679624][ C0] search_binary_handler+0x190/0x5e0 [ 59.684877][ C0] __do_execve_file+0x1565/0x1cc0 [ 59.689909][ C0] __x64_sys_execve+0x94/0xb0 [ 59.694559][ C0] do_syscall_64+0xf7/0x1c0 [ 59.699041][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 59.704902][ C0] [ 59.707207][ C0] The buggy address belongs to the object at ffff8880a5336bc0 [ 59.707207][ C0] which belongs to the cache kmalloc-32 of size 32 [ 59.721065][ C0] The buggy address is located 0 bytes inside of [ 59.721065][ C0] 32-byte region [ffff8880a5336bc0, ffff8880a5336be0) [ 59.734053][ C0] The buggy address belongs to the page: [ 59.739677][ C0] page:ffffea000294cd80 refcount:1 mapcount:0 mapping:ffff8880aa8001c0 index:0xffff8880a5336fc1 [ 59.750120][ C0] raw: 00fffe0000000200 ffffea00029a1b48 ffffea0002941e88 ffff8880aa8001c0 [ 59.758702][ C0] raw: ffff8880a5336fc1 ffff8880a5336000 000000010000003f 0000000000000000 [ 59.767258][ C0] page dumped because: kasan: bad access detected [ 59.773681][ C0] [ 59.775991][ C0] Memory state around the buggy address: [ 59.781600][ C0] ffff8880a5336a80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc [ 59.789637][ C0] ffff8880a5336b00: fb fb fb fb fc fc fc fc 00 00 01 fc fc fc fc fc [ 59.797673][ C0] >ffff8880a5336b80: fb fb fb fb fc fc fc fc 04 fc fc fc fc fc fc fc [ 59.805710][ C0] ^ [ 59.811838][ C0] ffff8880a5336c00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc [ 59.819874][ C0] ffff8880a5336c80: 06 fc fc fc fc fc fc fc 05 fc fc fc fc fc fc fc [ 59.827907][ C0] ================================================================== [ 59.835943][ C0] Disabling lock debugging due to kernel taint [ 59.842139][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 59.848714][ C0] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G B 5.5.0-rc6-syzkaller #0 [ 59.857973][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 59.868042][ C0] Call Trace: [ 59.871296][ C0] [ 59.874125][ C0] dump_stack+0x1fb/0x318 [ 59.878427][ C0] panic+0x264/0x7a9 [ 59.882338][ C0] ? __kasan_report+0x193/0x1c0 [ 59.887160][ C0] ? trace_hardirqs_on+0x34/0x80 [ 59.892068][ C0] ? _raw_spin_unlock_irqrestore+0xa8/0xe0 [ 59.897854][ C0] __kasan_report+0x1b9/0x1c0 [ 59.902499][ C0] ? bitmap_ip_gc+0x140/0x4b0 [ 59.907146][ C0] kasan_report+0x26/0x50 [ 59.911447][ C0] check_memory_region+0x2b6/0x2f0 [ 59.916527][ C0] __kasan_check_read+0x11/0x20 [ 59.921347][ C0] bitmap_ip_gc+0x140/0x4b0 [ 59.925857][ C0] ? bitmap_ip_create+0xac0/0xac0 [ 59.930862][ C0] call_timer_fn+0x95/0x170 [ 59.935340][ C0] ? bitmap_ip_create+0xac0/0xac0 [ 59.940339][ C0] __run_timers+0x776/0x970 [ 59.944820][ C0] ? check_preemption_disabled+0x44/0x260 [ 59.950505][ C0] ? debug_smp_processor_id+0x9/0x20 [ 59.955757][ C0] run_timer_softirq+0x4a/0x90 [ 59.960489][ C0] __do_softirq+0x283/0x7bd [ 59.964958][ C0] ? irq_exit+0x227/0x230 [ 59.969257][ C0] irq_exit+0x227/0x230 [ 59.973384][ C0] smp_apic_timer_interrupt+0x113/0x280 [ 59.978896][ C0] apic_timer_interrupt+0xf/0x20 [ 59.983799][ C0] [ 59.986722][ C0] RIP: 0010:native_safe_halt+0x12/0x20 [ 59.992149][ C0] Code: 89 d9 80 e1 07 80 c1 03 38 c1 7c ba 48 89 df e8 94 c6 b5 f9 eb b0 cc cc 55 48 89 e5 e9 07 00 00 00 0f 00 2d a2 a8 45 00 fb f4 <5d> c3 66 90 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 e9 07 00 00 [ 60.011720][ C0] RSP: 0018:ffffffff89007db8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 60.020111][ C0] RAX: 1ffffffff1215238 RBX: ffffffff89075a00 RCX: dffffc0000000000 [ 60.028053][ C0] RDX: 0000000000000000 RSI: ffffffff812bf90a RDI: ffffffff89076244 [ 60.035996][ C0] RBP: ffffffff89007db8 R08: ffffffff89076258 R09: fffffbfff120eb41 [ 60.043936][ C0] R10: fffffbfff120eb41 R11: 0000000000000000 R12: 1ffffffff120eb40 [ 60.051889][ C0] R13: dffffc0000000000 R14: dffffc0000000000 R15: 1ffffffff1215236 [ 60.059838][ C0] ? arch_cpu_idle+0xa/0x10 [ 60.064311][ C0] default_idle+0x50/0x70 [ 60.068643][ C0] arch_cpu_idle+0xa/0x10 [ 60.072965][ C0] default_idle_call+0x59/0xa0 [ 60.077701][ C0] do_idle+0x1ec/0x630 [ 60.081742][ C0] ? debug_smp_processor_id+0x1c/0x20 [ 60.087174][ C0] cpu_startup_entry+0x25/0x30 [ 60.091909][ C0] rest_init+0x29d/0x2b0 [ 60.096128][ C0] arch_call_rest_init+0xe/0x10 [ 60.100947][ C0] start_kernel+0x6d1/0x7d2 [ 60.105420][ C0] x86_64_start_reservations+0x18/0x2e [ 60.110852][ C0] x86_64_start_kernel+0x7a/0x7d [ 60.115764][ C0] secondary_startup_64+0xa4/0xb0 [ 60.122020][ C0] Kernel Offset: disabled [ 60.126354][ C0] Rebooting in 86400 seconds..