[ 74.583768][ T27] audit: type=1800 audit(1579684986.547:26): pid=9615 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 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. [ 75.568805][ T27] kauditd_printk_skb: 2 callbacks suppressed [ 75.568816][ T27] audit: type=1800 audit(1579684987.557:29): pid=9615 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 [ 75.595646][ T27] audit: type=1800 audit(1579684987.557:30): pid=9615 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 '10.128.0.155' (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 executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 85.833611][ C1] ================================================================== [ 85.841932][ C1] BUG: KASAN: slab-out-of-bounds in bitmap_ipmac_gc+0x119/0x590 [ 85.849585][ C1] Read of size 8 at addr ffff8880a6b800c0 by task swapper/1/0 [ 85.857015][ C1] [ 85.859328][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.5.0-rc7-syzkaller #0 [ 85.867212][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 85.877365][ C1] Call Trace: [ 85.880639][ C1] [ 85.883489][ C1] dump_stack+0x197/0x210 [ 85.887810][ C1] ? bitmap_ipmac_gc+0x119/0x590 [ 85.892789][ C1] print_address_description.constprop.0.cold+0xd4/0x30b [ 85.899820][ C1] ? bitmap_ipmac_gc+0x119/0x590 [ 85.904754][ C1] ? bitmap_ipmac_gc+0x119/0x590 [ 85.909684][ C1] __kasan_report.cold+0x1b/0x41 [ 85.914648][ C1] ? bitmap_ipmac_gc+0x119/0x590 [ 85.919572][ C1] kasan_report+0x12/0x20 [ 85.923891][ C1] check_memory_region+0x134/0x1a0 [ 85.928996][ C1] __kasan_check_read+0x11/0x20 [ 85.933835][ C1] bitmap_ipmac_gc+0x119/0x590 [ 85.938616][ C1] call_timer_fn+0x1ac/0x780 [ 85.943200][ C1] ? bitmap_ipmac_list+0x1080/0x1080 [ 85.948482][ C1] ? msleep_interruptible+0x150/0x150 [ 85.953842][ C1] ? run_timer_softirq+0x6b1/0x1790 [ 85.959036][ C1] ? trace_hardirqs_on+0x67/0x240 [ 85.964051][ C1] ? bitmap_ipmac_list+0x1080/0x1080 [ 85.969315][ C1] ? bitmap_ipmac_list+0x1080/0x1080 [ 85.974596][ C1] run_timer_softirq+0x6c3/0x1790 [ 85.979623][ C1] ? add_timer+0x930/0x930 [ 85.984069][ C1] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 85.990221][ C1] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 85.995758][ C1] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 86.001733][ C1] ? trace_hardirqs_on+0x67/0x240 [ 86.006782][ C1] __do_softirq+0x262/0x98c [ 86.011286][ C1] ? sched_clock_cpu+0x1b/0x1b0 [ 86.016176][ C1] irq_exit+0x19b/0x1e0 [ 86.020333][ C1] smp_apic_timer_interrupt+0x1a3/0x610 [ 86.025872][ C1] apic_timer_interrupt+0xf/0x20 [ 86.031051][ C1] [ 86.033977][ C1] RIP: 0010:native_safe_halt+0xe/0x10 [ 86.039332][ C1] Code: b8 80 de f9 eb 8a cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d c4 41 54 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d b4 41 54 00 fb f4 cc 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 be 4d 8e f9 e8 49 [ 86.058959][ C1] RSP: 0018:ffffc90000d3fd68 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 [ 86.067364][ C1] RAX: 1ffffffff1326676 RBX: ffff8880a99fc340 RCX: 0000000000000000 [ 86.075336][ C1] RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffff8880a99fcbd4 [ 86.083289][ C1] RBP: ffffc90000d3fd98 R08: ffff8880a99fc340 R09: 0000000000000000 [ 86.091238][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 [ 86.099189][ C1] R13: ffffffff8a7b4e80 R14: 0000000000000000 R15: 0000000000000001 [ 86.107158][ C1] ? default_idle+0x4e/0x360 [ 86.111785][ C1] arch_cpu_idle+0xa/0x10 [ 86.116094][ C1] default_idle_call+0x84/0xb0 [ 86.120837][ C1] do_idle+0x3c8/0x6e0 [ 86.124888][ C1] ? arch_cpu_idle_exit+0x80/0x80 [ 86.129900][ C1] ? _raw_spin_unlock_irqrestore+0x9f/0xe0 [ 86.135685][ C1] ? complete+0x61/0x80 [ 86.139818][ C1] cpu_startup_entry+0x1b/0x20 [ 86.144559][ C1] start_secondary+0x2f4/0x410 [ 86.149820][ C1] ? set_cpu_sibling_map+0x2140/0x2140 [ 86.155263][ C1] secondary_startup_64+0xa4/0xb0 [ 86.160266][ C1] [ 86.162570][ C1] Allocated by task 9769: [ 86.166909][ C1] save_stack+0x23/0x90 [ 86.171038][ C1] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 86.176643][ C1] kasan_kmalloc+0x9/0x10 [ 86.180949][ C1] __kmalloc+0x163/0x770 [ 86.185168][ C1] ip_set_alloc+0x38/0x5e [ 86.189506][ C1] bitmap_ipmac_create+0x4e8/0xa00 [ 86.194633][ C1] ip_set_create+0x6f1/0x1500 [ 86.199286][ C1] nfnetlink_rcv_msg+0xcf2/0xfb0 [ 86.204235][ C1] netlink_rcv_skb+0x177/0x450 [ 86.208976][ C1] nfnetlink_rcv+0x1ba/0x460 [ 86.213540][ C1] netlink_unicast+0x58c/0x7d0 [ 86.218278][ C1] netlink_sendmsg+0x91c/0xea0 [ 86.223061][ C1] sock_sendmsg+0xd7/0x130 [ 86.227452][ C1] ____sys_sendmsg+0x753/0x880 [ 86.232206][ C1] ___sys_sendmsg+0x100/0x170 [ 86.236899][ C1] __sys_sendmsg+0x105/0x1d0 [ 86.241487][ C1] __x64_sys_sendmsg+0x78/0xb0 [ 86.248780][ C1] do_syscall_64+0xfa/0x790 [ 86.253286][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 86.259164][ C1] [ 86.261515][ C1] Freed by task 9497: [ 86.265498][ C1] save_stack+0x23/0x90 [ 86.269632][ C1] __kasan_slab_free+0x102/0x150 [ 86.274549][ C1] kasan_slab_free+0xe/0x10 [ 86.279032][ C1] kfree+0x10a/0x2c0 [ 86.282909][ C1] single_release+0x95/0xc0 [ 86.287391][ C1] __fput+0x2ff/0x890 [ 86.291348][ C1] ____fput+0x16/0x20 [ 86.295309][ C1] task_work_run+0x145/0x1c0 [ 86.299874][ C1] exit_to_usermode_loop+0x316/0x380 [ 86.305135][ C1] do_syscall_64+0x676/0x790 [ 86.309704][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 86.315566][ C1] [ 86.317912][ C1] The buggy address belongs to the object at ffff8880a6b800c0 [ 86.317912][ C1] which belongs to the cache kmalloc-32 of size 32 [ 86.331775][ C1] The buggy address is located 0 bytes inside of [ 86.331775][ C1] 32-byte region [ffff8880a6b800c0, ffff8880a6b800e0) [ 86.344823][ C1] The buggy address belongs to the page: [ 86.350441][ C1] page:ffffea00029ae000 refcount:1 mapcount:0 mapping:ffff8880aa4001c0 index:0xffff8880a6b80fc1 [ 86.360826][ C1] raw: 00fffe0000000200 ffffea00027e8bc8 ffffea0002a1a0c8 ffff8880aa4001c0 [ 86.369386][ C1] raw: ffff8880a6b80fc1 ffff8880a6b80000 0000000100000023 0000000000000000 [ 86.377942][ C1] page dumped because: kasan: bad access detected [ 86.384325][ C1] [ 86.386644][ C1] Memory state around the buggy address: [ 86.392264][ C1] ffff8880a6b7ff80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 86.400407][ C1] ffff8880a6b80000: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc [ 86.408473][ C1] >ffff8880a6b80080: 00 01 fc fc fc fc fc fc 04 fc fc fc fc fc fc fc [ 86.416628][ C1] ^ [ 86.422779][ C1] ffff8880a6b80100: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 86.430830][ C1] ffff8880a6b80180: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc [ 86.438880][ C1] ================================================================== [ 86.446990][ C1] Disabling lock debugging due to kernel taint [ 86.453188][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 86.459775][ C1] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G B 5.5.0-rc7-syzkaller #0 [ 86.469043][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 86.479085][ C1] Call Trace: [ 86.482366][ C1] executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 86.485222][ C1] dump_stack+0x197/0x210 [ 86.489560][ C1] panic+0x2e3/0x75c [ 86.493460][ C1] ? add_taint.cold+0x16/0x16 [ 86.498143][ C1] ? retint_kernel+0x2b/0x2b [ 86.502849][ C1] ? trace_hardirqs_on+0x5e/0x240 [ 86.507885][ C1] ? bitmap_ipmac_gc+0x119/0x590 [ 86.512928][ C1] end_report+0x47/0x4f [ 86.517090][ C1] ? bitmap_ipmac_gc+0x119/0x590 [ 86.522023][ C1] __kasan_report.cold+0xe/0x41 [ 86.526873][ C1] ? bitmap_ipmac_gc+0x119/0x590 [ 86.531809][ C1] kasan_report+0x12/0x20 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 86.536135][ C1] check_memory_region+0x134/0x1a0 [ 86.541250][ C1] __kasan_check_read+0x11/0x20 [ 86.546109][ C1] bitmap_ipmac_gc+0x119/0x590 [ 86.550873][ C1] call_timer_fn+0x1ac/0x780 [ 86.555459][ C1] ? bitmap_ipmac_list+0x1080/0x1080 [ 86.560753][ C1] ? msleep_interruptible+0x150/0x150 [ 86.566131][ C1] ? run_timer_softirq+0x6b1/0x1790 [ 86.571340][ C1] ? trace_hardirqs_on+0x67/0x240 [ 86.576369][ C1] ? bitmap_ipmac_list+0x1080/0x1080 [ 86.581656][ C1] ? bitmap_ipmac_list+0x1080/0x1080 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 86.586948][ C1] run_timer_softirq+0x6c3/0x1790 [ 86.591981][ C1] ? add_timer+0x930/0x930 [ 86.596404][ C1] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 86.602564][ C1] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 86.608123][ C1] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 86.614112][ C1] ? trace_hardirqs_on+0x67/0x240 [ 86.619140][ C1] __do_softirq+0x262/0x98c [ 86.623647][ C1] ? sched_clock_cpu+0x1b/0x1b0 [ 86.628505][ C1] irq_exit+0x19b/0x1e0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 86.632668][ C1] smp_apic_timer_interrupt+0x1a3/0x610 [ 86.638218][ C1] apic_timer_interrupt+0xf/0x20 [ 86.643149][ C1] [ 86.646096][ C1] RIP: 0010:native_safe_halt+0xe/0x10 [ 86.651459][ C1] Code: b8 80 de f9 eb 8a cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d c4 41 54 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d b4 41 54 00 fb f4 cc 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 be 4d 8e f9 e8 49 [ 86.671050][ C1] RSP: 0018:ffffc90000d3fd68 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 [ 86.679460][ C1] RAX: 1ffffffff1326676 RBX: ffff8880a99fc340 RCX: 0000000000000000 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 86.687428][ C1] RDX: dffffc0000000000 RSI: 0000000000000006 RDI: ffff8880a99fcbd4 [ 86.695400][ C1] RBP: ffffc90000d3fd98 R08: ffff8880a99fc340 R09: 0000000000000000 [ 86.703372][ C1] R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000 [ 86.711339][ C1] R13: ffffffff8a7b4e80 R14: 0000000000000000 R15: 0000000000000001 [ 86.719321][ C1] ? default_idle+0x4e/0x360 [ 86.723916][ C1] arch_cpu_idle+0xa/0x10 [ 86.728334][ C1] default_idle_call+0x84/0xb0 [ 86.733099][ C1] do_idle+0x3c8/0x6e0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 86.737164][ C1] ? arch_cpu_idle_exit+0x80/0x80 [ 86.742181][ C1] ? _raw_spin_unlock_irqrestore+0x9f/0xe0 [ 86.747988][ C1] ? complete+0x61/0x80 [ 86.752146][ C1] cpu_startup_entry+0x1b/0x20 [ 86.756908][ C1] start_secondary+0x2f4/0x410 [ 86.761676][ C1] ? set_cpu_sibling_map+0x2140/0x2140 [ 86.767141][ C1] secondary_startup_64+0xa4/0xb0 [ 86.773432][ C1] Kernel Offset: disabled [ 86.777795][ C1] Rebooting in 86400 seconds..