[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 76.756214][ T27] audit: type=1800 audit(1579407179.187:25): pid=9360 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 76.776363][ T27] audit: type=1800 audit(1579407179.187:26): pid=9360 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 76.797388][ T27] audit: type=1800 audit(1579407179.187:27): pid=9360 uid=0 auid=4294967295 ses=4294967295 subj==unconfined 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 '10.128.0.226' (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 syzkaller login: [ 89.619191][ C0] ================================================================== [ 89.627452][ C0] BUG: KASAN: slab-out-of-bounds in bitmap_ip_gc+0x100/0x4f0 [ 89.634815][ C0] Read of size 8 at addr ffff8880a4933e80 by task swapper/0/0 [ 89.642298][ C0] [ 89.644625][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.5.0-rc5-syzkaller #0 [ 89.652538][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 89.662579][ C0] Call Trace: [ 89.665849][ C0] [ 89.668692][ C0] dump_stack+0x197/0x210 [ 89.673007][ C0] ? bitmap_ip_gc+0x100/0x4f0 [ 89.677695][ C0] print_address_description.constprop.0.cold+0xd4/0x30b [ 89.684718][ C0] ? bitmap_ip_gc+0x100/0x4f0 [ 89.689446][ C0] ? bitmap_ip_gc+0x100/0x4f0 [ 89.694116][ C0] __kasan_report.cold+0x1b/0x41 [ 89.699140][ C0] ? bitmap_ip_gc+0x100/0x4f0 [ 89.703829][ C0] kasan_report+0x12/0x20 [ 89.708146][ C0] check_memory_region+0x134/0x1a0 [ 89.713275][ C0] __kasan_check_read+0x11/0x20 [ 89.718121][ C0] bitmap_ip_gc+0x100/0x4f0 [ 89.722629][ C0] call_timer_fn+0x1ac/0x780 [ 89.727218][ C0] ? bitmap_ip_test+0x170/0x170 [ 89.732067][ C0] ? msleep_interruptible+0x150/0x150 [ 89.737458][ C0] ? run_timer_softirq+0x6b1/0x1790 [ 89.742653][ C0] ? trace_hardirqs_on+0x67/0x240 [ 89.747669][ C0] ? bitmap_ip_test+0x170/0x170 [ 89.752509][ C0] ? bitmap_ip_test+0x170/0x170 [ 89.757360][ C0] run_timer_softirq+0x6c3/0x1790 [ 89.762395][ C0] ? add_timer+0x930/0x930 [ 89.766798][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 89.772933][ C0] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 89.778476][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 89.784451][ C0] ? trace_hardirqs_on+0x67/0x240 [ 89.789467][ C0] __do_softirq+0x262/0x98c [ 89.793977][ C0] ? sched_clock_cpu+0x1b/0x1b0 [ 89.798890][ C0] irq_exit+0x19b/0x1e0 [ 89.803048][ C0] smp_apic_timer_interrupt+0x1a3/0x610 [ 89.808585][ C0] apic_timer_interrupt+0xf/0x20 [ 89.813499][ C0] [ 89.816442][ C0] RIP: 0010:native_safe_halt+0xe/0x10 [ 89.821796][ C0] Code: 08 76 de f9 eb 8a cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d a4 37 54 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 94 37 54 00 fb f4 cc 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 de 43 8e f9 e8 a9 [ 89.841387][ C0] RSP: 0018:ffffffff89807ce8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 89.849840][ C0] RAX: 1ffffffff132669e RBX: ffffffff8987a140 RCX: 0000000000000000 [ 89.857845][ C0] RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffffffff8987a9d4 [ 89.865972][ C0] RBP: ffffffff89807d18 R08: ffffffff8987a140 R09: 0000000000000000 [ 89.873933][ C0] R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 [ 89.881896][ C0] R13: ffffffff8a7b4c40 R14: 0000000000000000 R15: 0000000000000000 [ 89.889896][ C0] ? default_idle+0x4e/0x360 [ 89.894664][ C0] arch_cpu_idle+0xa/0x10 [ 89.899131][ C0] default_idle_call+0x84/0xb0 [ 89.903888][ C0] do_idle+0x3c8/0x6e0 [ 89.907943][ C0] ? arch_cpu_idle_exit+0x80/0x80 [ 89.912958][ C0] ? trace_hardirqs_on+0x67/0x240 [ 89.918754][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 89.924988][ C0] ? debug_smp_processor_id+0x33/0x18a [ 89.930445][ C0] cpu_startup_entry+0x1b/0x20 [ 89.935461][ C0] rest_init+0x23b/0x371 [ 89.939693][ C0] arch_call_rest_init+0xe/0x1b [ 89.944543][ C0] start_kernel+0x904/0x943 [ 89.949084][ C0] ? mem_encrypt_init+0xb/0xb [ 89.953757][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 89.960718][ C0] ? x86_family+0x41/0x50 [ 89.965039][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 89.971283][ C0] x86_64_start_reservations+0x29/0x2b [ 89.976742][ C0] x86_64_start_kernel+0x77/0x7b [ 89.981668][ C0] secondary_startup_64+0xa4/0xb0 [ 89.987284][ C0] [ 89.989603][ C0] Allocated by task 9513: [ 89.993931][ C0] save_stack+0x23/0x90 [ 89.998083][ C0] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 90.004980][ C0] kasan_kmalloc+0x9/0x10 [ 90.009397][ C0] __kmalloc+0x163/0x770 [ 90.013637][ C0] ip_set_alloc+0x38/0x5e [ 90.017952][ C0] bitmap_ip_create+0x6ec/0xc20 [ 90.022792][ C0] ip_set_create+0x6f1/0x1500 [ 90.027454][ C0] nfnetlink_rcv_msg+0xcf2/0xfb0 [ 90.032486][ C0] netlink_rcv_skb+0x177/0x450 [ 90.037238][ C0] nfnetlink_rcv+0x1ba/0x460 [ 90.041932][ C0] netlink_unicast+0x58c/0x7d0 [ 90.046684][ C0] netlink_sendmsg+0x91c/0xea0 [ 90.051429][ C0] sock_sendmsg+0xd7/0x130 [ 90.055835][ C0] ____sys_sendmsg+0x753/0x880 [ 90.060611][ C0] ___sys_sendmsg+0x100/0x170 [ 90.065413][ C0] __sys_sendmsg+0x105/0x1d0 [ 90.069997][ C0] __x64_sys_sendmsg+0x78/0xb0 [ 90.074751][ C0] do_syscall_64+0xfa/0x790 [ 90.079245][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 90.085218][ C0] [ 90.087675][ C0] Freed by task 9253: [ 90.091712][ C0] save_stack+0x23/0x90 [ 90.095881][ C0] __kasan_slab_free+0x102/0x150 [ 90.101670][ C0] kasan_slab_free+0xe/0x10 [ 90.106163][ C0] kfree+0x10a/0x2c0 [ 90.110045][ C0] load_elf_binary+0x61c/0x5310 [ 90.116349][ C0] search_binary_handler+0x16d/0x570 [ 90.122167][ C0] __do_execve_file.isra.0+0x1329/0x22b0 [ 90.127827][ C0] __x64_sys_execve+0x8f/0xc0 [ 90.132540][ C0] do_syscall_64+0xfa/0x790 [ 90.137039][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 90.142962][ C0] [ 90.145327][ C0] The buggy address belongs to the object at ffff8880a4933e80 [ 90.145327][ C0] which belongs to the cache kmalloc-32 of size 32 [ 90.159293][ C0] The buggy address is located 0 bytes inside of [ 90.159293][ C0] 32-byte region [ffff8880a4933e80, ffff8880a4933ea0) [ 90.172439][ C0] The buggy address belongs to the page: [ 90.178058][ C0] page:ffffea0002924cc0 refcount:1 mapcount:0 mapping:ffff8880aa4001c0 index:0xffff8880a4933fc1 [ 90.188559][ C0] raw: 00fffe0000000200 ffffea000252c3c8 ffffea00027d6108 ffff8880aa4001c0 [ 90.197485][ C0] raw: ffff8880a4933fc1 ffff8880a4933000 0000000100000037 0000000000000000 [ 90.206332][ C0] page dumped because: kasan: bad access detected [ 90.212729][ C0] [ 90.215066][ C0] Memory state around the buggy address: [ 90.220707][ C0] ffff8880a4933d80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc [ 90.228834][ C0] ffff8880a4933e00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc [ 90.237637][ C0] >ffff8880a4933e80: 04 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc [ 90.245795][ C0] ^ [ 90.250086][ C0] ffff8880a4933f00: 06 fc fc fc fc fc fc fc 00 01 fc fc fc fc fc fc [ 90.258338][ C0] ffff8880a4933f80: 00 00 fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 90.266387][ C0] ================================================================== [ 90.274490][ C0] Disabling lock debugging due to kernel taint [ 90.280774][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 90.287524][ C0] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G B 5.5.0-rc5-syzkaller #0 [ 90.296914][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 90.307043][ C0] Call Trace: [ 90.310317][ C0] [ 90.313162][ C0] dump_stack+0x197/0x210 [ 90.317569][ C0] panic+0x2e3/0x75c [ 90.321453][ C0] ? add_taint.cold+0x16/0x16 [ 90.326182][ C0] ? retint_kernel+0x2b/0x2b [ 90.331294][ C0] ? trace_hardirqs_on+0x5e/0x240 [ 90.336303][ C0] ? bitmap_ip_gc+0x100/0x4f0 [ 90.340970][ C0] end_report+0x47/0x4f [ 90.345112][ C0] ? bitmap_ip_gc+0x100/0x4f0 [ 90.349775][ C0] __kasan_report.cold+0xe/0x41 [ 90.354616][ C0] ? bitmap_ip_gc+0x100/0x4f0 [ 90.359767][ C0] kasan_report+0x12/0x20 [ 90.364081][ C0] check_memory_region+0x134/0x1a0 [ 90.369413][ C0] __kasan_check_read+0x11/0x20 [ 90.374252][ C0] bitmap_ip_gc+0x100/0x4f0 [ 90.378850][ C0] call_timer_fn+0x1ac/0x780 [ 90.383429][ C0] ? bitmap_ip_test+0x170/0x170 [ 90.388284][ C0] ? msleep_interruptible+0x150/0x150 [ 90.393792][ C0] ? run_timer_softirq+0x6b1/0x1790 [ 90.399361][ C0] ? trace_hardirqs_on+0x67/0x240 [ 90.404390][ C0] ? bitmap_ip_test+0x170/0x170 [ 90.409227][ C0] ? bitmap_ip_test+0x170/0x170 [ 90.414072][ C0] run_timer_softirq+0x6c3/0x1790 [ 90.419085][ C0] ? add_timer+0x930/0x930 [ 90.423771][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 90.429934][ C0] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 90.435463][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 90.441431][ C0] ? trace_hardirqs_on+0x67/0x240 [ 90.446471][ C0] __do_softirq+0x262/0x98c [ 90.451224][ C0] ? sched_clock_cpu+0x1b/0x1b0 [ 90.456060][ C0] irq_exit+0x19b/0x1e0 [ 90.460205][ C0] smp_apic_timer_interrupt+0x1a3/0x610 [ 90.465734][ C0] apic_timer_interrupt+0xf/0x20 [ 90.470665][ C0] [ 90.473618][ C0] RIP: 0010:native_safe_halt+0xe/0x10 [ 90.479314][ C0] Code: 08 76 de f9 eb 8a cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d a4 37 54 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 94 37 54 00 fb f4 cc 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 de 43 8e f9 e8 a9 [ 90.499211][ C0] RSP: 0018:ffffffff89807ce8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 90.507891][ C0] RAX: 1ffffffff132669e RBX: ffffffff8987a140 RCX: 0000000000000000 [ 90.516044][ C0] RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffffffff8987a9d4 [ 90.524070][ C0] RBP: ffffffff89807d18 R08: ffffffff8987a140 R09: 0000000000000000 [ 90.532035][ C0] R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 [ 90.539999][ C0] R13: ffffffff8a7b4c40 R14: 0000000000000000 R15: 0000000000000000 [ 90.548012][ C0] ? default_idle+0x4e/0x360 [ 90.552583][ C0] arch_cpu_idle+0xa/0x10 [ 90.556901][ C0] default_idle_call+0x84/0xb0 [ 90.561693][ C0] do_idle+0x3c8/0x6e0 [ 90.565741][ C0] ? arch_cpu_idle_exit+0x80/0x80 [ 90.570871][ C0] ? trace_hardirqs_on+0x67/0x240 [ 90.575918][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 90.582145][ C0] ? debug_smp_processor_id+0x33/0x18a [ 90.587589][ C0] cpu_startup_entry+0x1b/0x20 [ 90.592335][ C0] rest_init+0x23b/0x371 [ 90.596575][ C0] arch_call_rest_init+0xe/0x1b [ 90.601412][ C0] start_kernel+0x904/0x943 [ 90.605896][ C0] ? mem_encrypt_init+0xb/0xb [ 90.610557][ C0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 90.616827][ C0] ? x86_family+0x41/0x50 [ 90.621145][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 90.627374][ C0] x86_64_start_reservations+0x29/0x2b [ 90.632873][ C0] x86_64_start_kernel+0x77/0x7b [ 90.637842][ C0] secondary_startup_64+0xa4/0xb0 [ 90.644401][ C0] Kernel Offset: disabled [ 90.648742][ C0] Rebooting in 86400 seconds..