[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 59.897591][ T27] audit: type=1800 audit(1579522993.789:25): pid=8753 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 59.918893][ T27] audit: type=1800 audit(1579522993.789:26): pid=8753 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 59.969495][ T27] audit: type=1800 audit(1579522993.789:27): pid=8753 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 '10.128.1.35' (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 syzkaller login: [ 69.219578][ C0] ================================================================== [ 69.227913][ C0] BUG: KASAN: slab-out-of-bounds in bitmap_ipmac_gc+0x173/0x5d0 [ 69.235561][ C0] Read of size 8 at addr ffff8880a6c290c0 by task kworker/0:180/3237 [ 69.243753][ C0] [ 69.246093][ C0] CPU: 0 PID: 3237 Comm: kworker/0:180 Not tainted 5.5.0-rc7-syzkaller #0 [ 69.254625][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.264752][ C0] Workqueue: events free_work executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 69.269435][ C0] Call Trace: [ 69.272727][ C0] [ 69.275594][ C0] dump_stack+0x1fb/0x318 [ 69.279938][ C0] print_address_description+0x74/0x5c0 [ 69.285503][ C0] ? vprintk_default+0x28/0x30 [ 69.290269][ C0] ? vprintk_func+0x158/0x170 [ 69.295131][ C0] ? printk+0x62/0x8d [ 69.299126][ C0] __kasan_report+0x149/0x1c0 [ 69.303820][ C0] ? bitmap_ipmac_gc+0x173/0x5d0 [ 69.308820][ C0] kasan_report+0x26/0x50 [ 69.313198][ C0] check_memory_region+0x2b6/0x2f0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 69.318474][ C0] __kasan_check_read+0x11/0x20 [ 69.323350][ C0] bitmap_ipmac_gc+0x173/0x5d0 [ 69.328139][ C0] ? bitmap_ipmac_create+0x840/0x840 [ 69.333469][ C0] call_timer_fn+0x95/0x170 [ 69.337997][ C0] ? bitmap_ipmac_create+0x840/0x840 [ 69.343286][ C0] __run_timers+0x776/0x970 [ 69.347934][ C0] ? check_preemption_disabled+0x44/0x260 [ 69.353774][ C0] ? debug_smp_processor_id+0x9/0x20 [ 69.359065][ C0] run_timer_softirq+0x4a/0x90 [ 69.363837][ C0] __do_softirq+0x283/0x7bd executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 69.368350][ C0] ? irq_exit+0x227/0x230 [ 69.372693][ C0] irq_exit+0x227/0x230 [ 69.376868][ C0] smp_apic_timer_interrupt+0x113/0x280 [ 69.382432][ C0] apic_timer_interrupt+0xf/0x20 [ 69.387372][ C0] [ 69.390320][ C0] RIP: 0010:kfree+0x15f/0x220 [ 69.395003][ C0] Code: f7 57 9d 0f 1f 44 00 00 e8 ae f9 c9 ff e9 87 00 00 00 e8 44 f7 c9 ff 48 83 3d 34 66 58 07 00 0f 84 b9 00 00 00 4c 89 f7 57 9d <0f> 1f 44 00 00 eb 68 c6 05 d0 8d 8e 07 01 48 c7 c7 26 4f c5 88 48 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 69.414695][ C0] RSP: 0018:ffffc9000981fbd8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 69.423096][ C0] RAX: ffff88809df68c14 RBX: ffff8880aa800380 RCX: ffffffff815bda87 [ 69.431066][ C0] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000282 [ 69.439159][ C0] RBP: ffffc9000981fc00 R08: ffff88809df68bd8 R09: fffffbfff13cd121 [ 69.447266][ C0] R10: fffffbfff13cd121 R11: 0000000000000000 R12: ffff8880a3353080 [ 69.455455][ C0] R13: 00fffe0000000200 R14: 0000000000000282 R15: ffffffff819e1c26 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 69.463441][ C0] ? kvfree+0x46/0x50 [ 69.471410][ C0] ? mark_lock+0x107/0x1650 [ 69.475916][ C0] kvfree+0x46/0x50 [ 69.479732][ C0] __vunmap+0x975/0xa10 [ 69.483917][ C0] free_work+0x66/0x90 [ 69.488026][ C0] process_one_work+0x7f5/0x10d0 [ 69.492997][ C0] worker_thread+0xbbc/0x1630 [ 69.497708][ C0] kthread+0x332/0x350 [ 69.502430][ C0] ? rcu_lock_release+0x30/0x30 [ 69.507368][ C0] ? kthread_blkcg+0xe0/0xe0 [ 69.511974][ C0] ret_from_fork+0x24/0x30 [ 69.516407][ C0] executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 69.518760][ C0] Allocated by task 8911: [ 69.523233][ C0] __kasan_kmalloc+0x118/0x1c0 [ 69.528109][ C0] kasan_kmalloc+0x9/0x10 [ 69.532441][ C0] __kmalloc+0x254/0x340 [ 69.536825][ C0] kzalloc+0x21/0x40 [ 69.540731][ C0] ip_set_alloc+0x32/0x60 [ 69.545081][ C0] bitmap_ipmac_create+0x3d9/0x840 [ 69.550241][ C0] ip_set_create+0x421/0xfd0 [ 69.554847][ C0] nfnetlink_rcv_msg+0x9ae/0xcd0 [ 69.559789][ C0] netlink_rcv_skb+0x19e/0x3e0 [ 69.564649][ C0] nfnetlink_rcv+0x1e0/0x1e50 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 69.569439][ C0] netlink_unicast+0x767/0x920 [ 69.574389][ C0] netlink_sendmsg+0xa2c/0xd50 [ 69.579168][ C0] ____sys_sendmsg+0x4f7/0x7f0 [ 69.584060][ C0] __sys_sendmsg+0x1ed/0x290 [ 69.588661][ C0] __x64_sys_sendmsg+0x7f/0x90 [ 69.593437][ C0] do_syscall_64+0xf7/0x1c0 [ 69.598280][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 69.604345][ C0] [ 69.606680][ C0] Freed by task 8650: [ 69.610683][ C0] __kasan_slab_free+0x12e/0x1e0 [ 69.615620][ C0] kasan_slab_free+0xe/0x10 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 69.620131][ C0] kfree+0x10d/0x220 [ 69.624050][ C0] tomoyo_find_next_domain+0xe45/0x1cc0 [ 69.629636][ C0] tomoyo_bprm_check_security+0xe3/0x130 [ 69.635303][ C0] security_bprm_check+0x50/0xb0 [ 69.640286][ C0] search_binary_handler+0x6a/0x5e0 [ 69.645604][ C0] __do_execve_file+0x1565/0x1cc0 [ 69.650645][ C0] __x64_sys_execve+0x94/0xb0 [ 69.655336][ C0] do_syscall_64+0xf7/0x1c0 [ 69.659852][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 69.665901][ C0] executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 69.668366][ C0] The buggy address belongs to the object at ffff8880a6c290c0 [ 69.668366][ C0] which belongs to the cache kmalloc-32 of size 32 [ 69.682871][ C0] The buggy address is located 0 bytes inside of [ 69.682871][ C0] 32-byte region [ffff8880a6c290c0, ffff8880a6c290e0) [ 69.695988][ C0] The buggy address belongs to the page: [ 69.701626][ C0] page:ffffea00029b0a40 refcount:1 mapcount:0 mapping:ffff8880aa8001c0 index:0xffff8880a6c29fc1 [ 69.712042][ C0] raw: 00fffe0000000200 ffffea000274dbc8 ffffea0002a5d708 ffff8880aa8001c0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 69.720641][ C0] raw: ffff8880a6c29fc1 ffff8880a6c29000 0000000100000013 0000000000000000 [ 69.729221][ C0] page dumped because: kasan: bad access detected [ 69.735643][ C0] [ 69.737973][ C0] Memory state around the buggy address: [ 69.743611][ C0] ffff8880a6c28f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 69.751682][ C0] ffff8880a6c29000: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc [ 69.759764][ C0] >ffff8880a6c29080: fb fb fb fb fc fc fc fc 04 fc fc fc 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 [ 69.767976][ C0] ^ [ 69.774142][ C0] ffff8880a6c29100: 00 00 fc fc fc fc fc fc fb fb fb fb fc fc fc fc [ 69.784217][ C0] ffff8880a6c29180: fb fb fb fb fc fc fc fc 00 00 01 fc fc fc fc fc [ 69.792279][ C0] ================================================================== [ 69.800343][ C0] Disabling lock debugging due to kernel taint [ 69.806553][ C0] Kernel panic - not syncing: panic_on_warn set ... executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 69.813148][ C0] CPU: 0 PID: 3237 Comm: kworker/0:180 Tainted: G B 5.5.0-rc7-syzkaller #0 [ 69.823020][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.833203][ C0] Workqueue: events free_work [ 69.837878][ C0] Call Trace: [ 69.841151][ C0] [ 69.844013][ C0] dump_stack+0x1fb/0x318 [ 69.848347][ C0] panic+0x264/0x7a9 [ 69.852247][ C0] ? __kasan_report+0x193/0x1c0 [ 69.857103][ C0] ? trace_hardirqs_on+0x34/0x80 [ 69.862168][ C0] ? _raw_spin_unlock_irqrestore+0xa8/0xe0 [ 69.867981][ C0] __kasan_report+0x1b9/0x1c0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 69.872664][ C0] ? bitmap_ipmac_gc+0x173/0x5d0 [ 69.877629][ C0] kasan_report+0x26/0x50 [ 69.881968][ C0] check_memory_region+0x2b6/0x2f0 [ 69.887085][ C0] __kasan_check_read+0x11/0x20 [ 69.891952][ C0] bitmap_ipmac_gc+0x173/0x5d0 [ 69.896741][ C0] ? bitmap_ipmac_create+0x840/0x840 [ 69.902048][ C0] call_timer_fn+0x95/0x170 [ 69.906572][ C0] ? bitmap_ipmac_create+0x840/0x840 [ 69.911873][ C0] __run_timers+0x776/0x970 [ 69.916587][ C0] ? check_preemption_disabled+0x44/0x260 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 69.922350][ C0] ? debug_smp_processor_id+0x9/0x20 [ 69.927639][ C0] run_timer_softirq+0x4a/0x90 [ 69.932399][ C0] __do_softirq+0x283/0x7bd [ 69.936913][ C0] ? irq_exit+0x227/0x230 [ 69.941252][ C0] irq_exit+0x227/0x230 [ 69.945534][ C0] smp_apic_timer_interrupt+0x113/0x280 [ 69.951175][ C0] apic_timer_interrupt+0xf/0x20 [ 69.956110][ C0] [ 69.959061][ C0] RIP: 0010:kfree+0x15f/0x220 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 69.963746][ C0] Code: f7 57 9d 0f 1f 44 00 00 e8 ae f9 c9 ff e9 87 00 00 00 e8 44 f7 c9 ff 48 83 3d 34 66 58 07 00 0f 84 b9 00 00 00 4c 89 f7 57 9d <0f> 1f 44 00 00 eb 68 c6 05 d0 8d 8e 07 01 48 c7 c7 26 4f c5 88 48 [ 69.983568][ C0] RSP: 0018:ffffc9000981fbd8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 69.992091][ C0] RAX: ffff88809df68c14 RBX: ffff8880aa800380 RCX: ffffffff815bda87 [ 70.000169][ C0] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000282 [ 70.008273][ C0] RBP: ffffc9000981fc00 R08: ffff88809df68bd8 R09: fffffbfff13cd121 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 70.016377][ C0] R10: fffffbfff13cd121 R11: 0000000000000000 R12: ffff8880a3353080 [ 70.024372][ C0] R13: 00fffe0000000200 R14: 0000000000000282 R15: ffffffff819e1c26 [ 70.032355][ C0] ? kvfree+0x46/0x50 [ 70.036391][ C0] ? mark_lock+0x107/0x1650 [ 70.040904][ C0] kvfree+0x46/0x50 [ 70.044720][ C0] __vunmap+0x975/0xa10 [ 70.048883][ C0] free_work+0x66/0x90 [ 70.052970][ C0] process_one_work+0x7f5/0x10d0 [ 70.057937][ C0] worker_thread+0xbbc/0x1630 [ 70.062618][ C0] kthread+0x332/0x350 [ 70.066683][ C0] ? rcu_lock_release+0x30/0x30 executing program [ 70.071541][ C0] ? kthread_blkcg+0xe0/0xe0 [ 70.076148][ C0] ret_from_fork+0x24/0x30 [ 70.081526][ C0] Kernel Offset: disabled [ 70.085879][ C0] Rebooting in 86400 seconds..