[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 73.671225][ T27] kauditd_printk_skb: 4 callbacks suppressed [ 73.671236][ T27] audit: type=1800 audit(1579577861.854:29): pid=9748 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 73.698114][ T27] audit: type=1800 audit(1579577861.854:30): pid=9748 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.167' (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 syzkaller login: [ 96.999957][ C0] ================================================================== [ 97.008411][ C0] BUG: KASAN: slab-out-of-bounds in bitmap_ipmac_gc+0x119/0x590 [ 97.016028][ C0] Read of size 8 at addr ffff88809e867280 by task syz-executor401/10276 [ 97.024392][ C0] [ 97.026724][ C0] CPU: 0 PID: 10276 Comm: syz-executor401 Not tainted 5.5.0-rc7-syzkaller #0 [ 97.035642][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 97.045740][ C0] Call Trace: [ 97.049026][ C0] [ 97.051897][ C0] dump_stack+0x197/0x210 [ 97.056237][ C0] ? bitmap_ipmac_gc+0x119/0x590 [ 97.061222][ C0] print_address_description.constprop.0.cold+0xd4/0x30b [ 97.068303][ C0] ? bitmap_ipmac_gc+0x119/0x590 [ 97.073231][ C0] ? bitmap_ipmac_gc+0x119/0x590 [ 97.078209][ C0] __kasan_report.cold+0x1b/0x41 [ 97.083157][ C0] ? bitmap_ipmac_gc+0x119/0x590 [ 97.088115][ C0] kasan_report+0x12/0x20 [ 97.092439][ C0] check_memory_region+0x134/0x1a0 [ 97.097538][ C0] __kasan_check_read+0x11/0x20 [ 97.102383][ C0] bitmap_ipmac_gc+0x119/0x590 [ 97.107195][ C0] call_timer_fn+0x1ac/0x780 [ 97.111773][ C0] ? bitmap_ipmac_list+0x1080/0x1080 [ 97.117046][ C0] ? msleep_interruptible+0x150/0x150 [ 97.122450][ C0] ? run_timer_softirq+0x6b1/0x1790 [ 97.127645][ C0] ? trace_hardirqs_on+0x67/0x240 [ 97.132654][ C0] ? bitmap_ipmac_list+0x1080/0x1080 [ 97.137932][ C0] ? bitmap_ipmac_list+0x1080/0x1080 [ 97.143223][ C0] run_timer_softirq+0x6c3/0x1790 [ 97.148246][ C0] ? add_timer+0x930/0x930 [ 97.152774][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 97.158925][ C0] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 97.164488][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 97.170482][ C0] ? trace_hardirqs_on+0x67/0x240 [ 97.175555][ C0] __do_softirq+0x262/0x98c [ 97.180227][ C0] ? sched_clock_cpu+0x1b/0x1b0 [ 97.185076][ C0] irq_exit+0x19b/0x1e0 [ 97.189280][ C0] smp_apic_timer_interrupt+0x1a3/0x610 [ 97.194823][ C0] apic_timer_interrupt+0xf/0x20 [ 97.199794][ C0] [ 97.202726][ C0] RIP: 0010:lock_is_held_type+0x272/0x320 [ 97.208654][ C0] Code: ff df c7 83 94 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 88 00 00 00 48 83 3d 9e 00 39 08 00 74 31 48 8b 7d c0 57 9d <0f> 1f 44 00 00 48 83 c4 20 44 89 e0 5b 41 5c 41 5d 41 5e 41 5f 5d [ 97.228380][ C0] RSP: 0000:ffffc90003857b00 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 97.236786][ C0] RAX: 1ffffffff1326673 RBX: ffff8880a2590340 RCX: ffff8880a2590bd8 [ 97.244958][ C0] RDX: dffffc0000000000 RSI: ffffffff899a3d80 RDI: 0000000000000282 [ 97.252925][ C0] RBP: ffffc90003857b48 R08: ffff8880a2590340 R09: ffffed1015d0703d [ 97.260953][ C0] R10: ffffed1015d0703c R11: ffff8880ae8381e3 R12: 0000000000000000 [ 97.268929][ C0] R13: ffff8880a2590bd8 R14: ffffffff899a3d80 R15: 0000000000000001 [ 97.276981][ C0] ? ___might_sleep+0x163/0x2c0 [ 97.282108][ C0] ___might_sleep+0x242/0x2c0 [ 97.286776][ C0] clear_huge_page+0xa0/0x3e0 [ 97.291448][ C0] do_huge_pmd_anonymous_page+0x6a6/0x1a50 [ 97.297242][ C0] ? mark_lock+0xc2/0x1220 [ 97.301654][ C0] ? prep_transhuge_page+0xa0/0xa0 [ 97.306765][ C0] __handle_mm_fault+0x3145/0x3cc0 [ 97.312184][ C0] ? apply_to_existing_page_range+0x50/0x50 [ 97.318078][ C0] ? handle_mm_fault+0x292/0xa50 [ 97.323017][ C0] ? handle_mm_fault+0x7a0/0xa50 [ 97.328059][ C0] ? __kasan_check_read+0x11/0x20 [ 97.333081][ C0] handle_mm_fault+0x3b2/0xa50 [ 97.337991][ C0] __do_page_fault+0x536/0xd80 [ 97.342753][ C0] do_page_fault+0x38/0x590 [ 97.347378][ C0] page_fault+0x39/0x40 [ 97.351528][ C0] RIP: 0023:0x80485cf [ 97.355506][ C0] Code: 6a 0c 6a 03 6a 10 68 67 01 00 00 e8 8b 6b 02 00 83 c4 20 83 f8 ff 74 0d a3 68 c0 0e 08 c1 f8 1f a3 6c c0 0e 08 b8 98 03 00 20 05 00 03 00 20 00 00 00 00 c7 05 04 03 00 20 00 00 00 00 c7 05 [ 97.375278][ C0] RSP: 002b:00000000ff9a4f80 EFLAGS: 00010246 [ 97.383536][ C0] RAX: 0000000020000398 RBX: 0000000000000000 RCX: 0000000000000003 [ 97.391509][ C0] RDX: 000000000000000c RSI: 0000000000017ac4 RDI: 0000000000000000 [ 97.399483][ C0] RBP: 00000000ff9a4fa8 R08: 0000000000000000 R09: 0000000000000000 [ 97.407451][ C0] R10: 0000000000000000 R11: 0000000000000207 R12: 0000000000000000 [ 97.415439][ C0] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 97.423414][ C0] [ 97.426916][ C0] Allocated by task 9906: [ 97.431351][ C0] save_stack+0x23/0x90 [ 97.435503][ C0] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 97.441127][ C0] kasan_kmalloc+0x9/0x10 [ 97.445517][ C0] __kmalloc+0x163/0x770 [ 97.449835][ C0] ip_set_alloc+0x38/0x5e [ 97.454253][ C0] bitmap_ipmac_create+0x4e8/0xa00 [ 97.459357][ C0] ip_set_create+0x6f1/0x1500 [ 97.464030][ C0] nfnetlink_rcv_msg+0xcf2/0xfb0 [ 97.469019][ C0] netlink_rcv_skb+0x177/0x450 [ 97.473777][ C0] nfnetlink_rcv+0x1ba/0x460 [ 97.478369][ C0] netlink_unicast+0x58c/0x7d0 [ 97.483130][ C0] netlink_sendmsg+0x91c/0xea0 [ 97.487881][ C0] sock_sendmsg+0xd7/0x130 [ 97.492288][ C0] ____sys_sendmsg+0x753/0x880 [ 97.497041][ C0] ___sys_sendmsg+0x100/0x170 [ 97.501724][ C0] __sys_sendmsg+0x105/0x1d0 [ 97.506314][ C0] __ia32_compat_sys_sendmsg+0x7a/0xb0 [ 97.511939][ C0] do_fast_syscall_32+0x27b/0xe16 [ 97.516954][ C0] entry_SYSENTER_compat+0x70/0x7f [ 97.522049][ C0] [ 97.524372][ C0] Freed by task 9630: [ 97.528342][ C0] save_stack+0x23/0x90 [ 97.532481][ C0] __kasan_slab_free+0x102/0x150 [ 97.537415][ C0] kasan_slab_free+0xe/0x10 [ 97.541913][ C0] kfree+0x10a/0x2c0 [ 97.545800][ C0] single_release+0x95/0xc0 [ 97.550292][ C0] __fput+0x2ff/0x890 [ 97.554260][ C0] ____fput+0x16/0x20 [ 97.558236][ C0] task_work_run+0x145/0x1c0 [ 97.562824][ C0] exit_to_usermode_loop+0x316/0x380 [ 97.568099][ C0] do_syscall_64+0x676/0x790 [ 97.572694][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 97.578568][ C0] [ 97.580890][ C0] The buggy address belongs to the object at ffff88809e867280 [ 97.580890][ C0] which belongs to the cache kmalloc-32 of size 32 [ 97.594767][ C0] The buggy address is located 0 bytes inside of [ 97.594767][ C0] 32-byte region [ffff88809e867280, ffff88809e8672a0) [ 97.607797][ C0] The buggy address belongs to the page: [ 97.613531][ C0] page:ffffea00027a19c0 refcount:1 mapcount:0 mapping:ffff8880aa4001c0 index:0xffff88809e867fc1 [ 97.623959][ C0] raw: 00fffe0000000200 ffffea0002522dc8 ffffea00025391c8 ffff8880aa4001c0 [ 97.632537][ C0] raw: ffff88809e867fc1 ffff88809e867000 000000010000001d 0000000000000000 [ 97.641146][ C0] page dumped because: kasan: bad access detected [ 97.647555][ C0] [ 97.649873][ C0] Memory state around the buggy address: [ 97.655509][ C0] ffff88809e867180: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc [ 97.663563][ C0] ffff88809e867200: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc [ 97.671650][ C0] >ffff88809e867280: 04 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc [ 97.679701][ C0] ^ [ 97.683924][ C0] ffff88809e867300: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc [ 97.692072][ C0] ffff88809e867380: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc [ 97.700125][ C0] ================================================================== [ 97.708266][ C0] Disabling lock debugging due to kernel taint [ 97.714560][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 97.721170][ C0] CPU: 0 PID: 10276 Comm: syz-executor401 Tainted: G B 5.5.0-rc7-syzkaller #0 [ 97.731362][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 97.741559][ C0] Call Trace: [ 97.744827][ C0] [ 97.747663][ C0] dump_stack+0x197/0x210 [ 97.751983][ C0] panic+0x2e3/0x75c [ 97.755915][ C0] ? add_taint.cold+0x16/0x16 [ 97.760583][ C0] ? retint_kernel+0x2b/0x2b [ 97.765172][ C0] ? trace_hardirqs_on+0x5e/0x240 [ 97.770274][ C0] ? bitmap_ipmac_gc+0x119/0x590 [ 97.775267][ C0] end_report+0x47/0x4f [ 97.779449][ C0] ? bitmap_ipmac_gc+0x119/0x590 [ 97.784383][ C0] __kasan_report.cold+0xe/0x41 [ 97.789415][ C0] ? bitmap_ipmac_gc+0x119/0x590 [ 97.794342][ C0] kasan_report+0x12/0x20 [ 97.798662][ C0] check_memory_region+0x134/0x1a0 [ 97.803861][ C0] __kasan_check_read+0x11/0x20 [ 97.808698][ C0] bitmap_ipmac_gc+0x119/0x590 [ 97.813453][ C0] call_timer_fn+0x1ac/0x780 [ 97.818052][ C0] ? bitmap_ipmac_list+0x1080/0x1080 [ 97.823527][ C0] ? msleep_interruptible+0x150/0x150 [ 97.828896][ C0] ? run_timer_softirq+0x6b1/0x1790 [ 97.834185][ C0] ? trace_hardirqs_on+0x67/0x240 [ 97.839203][ C0] ? bitmap_ipmac_list+0x1080/0x1080 [ 97.844623][ C0] ? bitmap_ipmac_list+0x1080/0x1080 [ 97.849903][ C0] run_timer_softirq+0x6c3/0x1790 [ 97.854922][ C0] ? add_timer+0x930/0x930 [ 97.859418][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 97.865623][ C0] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 97.871207][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 97.877174][ C0] ? trace_hardirqs_on+0x67/0x240 [ 97.882224][ C0] __do_softirq+0x262/0x98c [ 97.886739][ C0] ? sched_clock_cpu+0x1b/0x1b0 [ 97.891575][ C0] irq_exit+0x19b/0x1e0 [ 97.895719][ C0] smp_apic_timer_interrupt+0x1a3/0x610 [ 97.901284][ C0] apic_timer_interrupt+0xf/0x20 [ 97.906258][ C0] [ 97.909184][ C0] RIP: 0010:lock_is_held_type+0x272/0x320 [ 97.914897][ C0] Code: ff df c7 83 94 08 00 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 88 00 00 00 48 83 3d 9e 00 39 08 00 74 31 48 8b 7d c0 57 9d <0f> 1f 44 00 00 48 83 c4 20 44 89 e0 5b 41 5c 41 5d 41 5e 41 5f 5d [ 97.934596][ C0] RSP: 0000:ffffc90003857b00 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 97.943606][ C0] RAX: 1ffffffff1326673 RBX: ffff8880a2590340 RCX: ffff8880a2590bd8 [ 97.951809][ C0] RDX: dffffc0000000000 RSI: ffffffff899a3d80 RDI: 0000000000000282 [ 97.959774][ C0] RBP: ffffc90003857b48 R08: ffff8880a2590340 R09: ffffed1015d0703d [ 97.967735][ C0] R10: ffffed1015d0703c R11: ffff8880ae8381e3 R12: 0000000000000000 [ 97.976132][ C0] R13: ffff8880a2590bd8 R14: ffffffff899a3d80 R15: 0000000000000001 [ 97.984147][ C0] ? ___might_sleep+0x163/0x2c0 [ 97.988985][ C0] ___might_sleep+0x242/0x2c0 [ 97.993645][ C0] clear_huge_page+0xa0/0x3e0 [ 97.998409][ C0] do_huge_pmd_anonymous_page+0x6a6/0x1a50 [ 98.004281][ C0] ? mark_lock+0xc2/0x1220 [ 98.008686][ C0] ? prep_transhuge_page+0xa0/0xa0 [ 98.013790][ C0] __handle_mm_fault+0x3145/0x3cc0 [ 98.018910][ C0] ? apply_to_existing_page_range+0x50/0x50 [ 98.024795][ C0] ? handle_mm_fault+0x292/0xa50 [ 98.029726][ C0] ? handle_mm_fault+0x7a0/0xa50 [ 98.034660][ C0] ? __kasan_check_read+0x11/0x20 [ 98.039687][ C0] handle_mm_fault+0x3b2/0xa50 [ 98.044562][ C0] __do_page_fault+0x536/0xd80 [ 98.049323][ C0] do_page_fault+0x38/0x590 [ 98.053820][ C0] page_fault+0x39/0x40 [ 98.058071][ C0] RIP: 0023:0x80485cf [ 98.062211][ C0] Code: 6a 0c 6a 03 6a 10 68 67 01 00 00 e8 8b 6b 02 00 83 c4 20 83 f8 ff 74 0d a3 68 c0 0e 08 c1 f8 1f a3 6c c0 0e 08 b8 98 03 00 20 05 00 03 00 20 00 00 00 00 c7 05 04 03 00 20 00 00 00 00 c7 05 [ 98.081802][ C0] RSP: 002b:00000000ff9a4f80 EFLAGS: 00010246 [ 98.087864][ C0] RAX: 0000000020000398 RBX: 0000000000000000 RCX: 0000000000000003 [ 98.095824][ C0] RDX: 000000000000000c RSI: 0000000000017ac4 RDI: 0000000000000000 [ 98.103986][ C0] RBP: 00000000ff9a4fa8 R08: 0000000000000000 R09: 0000000000000000 [ 98.111987][ C0] R10: 0000000000000000 R11: 0000000000000207 R12: 0000000000000000 [ 98.120037][ C0] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 98.129871][ C0] Kernel Offset: disabled [ 98.134213][ C0] Rebooting in 86400 seconds..