[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 71.320487][ T27] audit: type=1800 audit(1579686151.759:25): pid=9664 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 71.352175][ T27] audit: type=1800 audit(1579686151.769:26): pid=9664 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 71.415600][ T27] audit: type=1800 audit(1579686151.769:27): pid=9664 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 '10.128.0.14' (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 syzkaller login: [ 88.792338][ C1] ================================================================== [ 88.800586][ C1] BUG: KASAN: slab-out-of-bounds in bitmap_ipmac_gc+0x119/0x590 [ 88.808220][ C1] Read of size 8 at addr ffff8880a370e900 by task ksoftirqd/1/16 [ 88.815909][ C1] [ 88.818224][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.5.0-rc7-syzkaller #0 [ 88.826350][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 88.836384][ C1] Call Trace: [ 88.839658][ C1] dump_stack+0x197/0x210 [ 88.843966][ C1] ? bitmap_ipmac_gc+0x119/0x590 [ 88.848884][ C1] print_address_description.constprop.0.cold+0xd4/0x30b [ 88.855900][ C1] ? bitmap_ipmac_gc+0x119/0x590 [ 88.860888][ C1] ? bitmap_ipmac_gc+0x119/0x590 [ 88.865832][ C1] __kasan_report.cold+0x1b/0x41 [ 88.870756][ C1] ? bitmap_ipmac_gc+0x119/0x590 [ 88.875677][ C1] kasan_report+0x12/0x20 [ 88.880016][ C1] check_memory_region+0x134/0x1a0 [ 88.885113][ C1] __kasan_check_read+0x11/0x20 [ 88.889943][ C1] bitmap_ipmac_gc+0x119/0x590 [ 88.894692][ C1] call_timer_fn+0x1ac/0x780 [ 88.899333][ C1] ? bitmap_ipmac_list+0x1080/0x1080 [ 88.904793][ C1] ? msleep_interruptible+0x150/0x150 [ 88.910165][ C1] ? run_timer_softirq+0x6b1/0x1790 [ 88.915352][ C1] ? trace_hardirqs_on+0x67/0x240 [ 88.920360][ C1] ? bitmap_ipmac_list+0x1080/0x1080 [ 88.925630][ C1] ? bitmap_ipmac_list+0x1080/0x1080 [ 88.930904][ C1] run_timer_softirq+0x6c3/0x1790 [ 88.935919][ C1] ? add_timer+0x930/0x930 [ 88.940343][ C1] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 88.946665][ C1] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 88.952191][ C1] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 88.958247][ C1] ? trace_hardirqs_on+0x67/0x240 [ 88.963254][ C1] __do_softirq+0x262/0x98c [ 88.967741][ C1] ? takeover_tasklets+0x820/0x820 [ 88.972828][ C1] run_ksoftirqd+0x8e/0x110 [ 88.977320][ C1] smpboot_thread_fn+0x6a3/0xa40 [ 88.982239][ C1] ? __smpboot_create_thread.part.0+0x340/0x340 [ 88.988466][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 88.994688][ C1] ? __kthread_parkme+0x108/0x1c0 [ 88.999689][ C1] ? __kasan_check_read+0x11/0x20 [ 89.004701][ C1] kthread+0x361/0x430 [ 89.008747][ C1] ? __smpboot_create_thread.part.0+0x340/0x340 [ 89.014964][ C1] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 89.020670][ C1] ret_from_fork+0x24/0x30 [ 89.025066][ C1] [ 89.027374][ C1] Allocated by task 9822: [ 89.031679][ C1] save_stack+0x23/0x90 [ 89.035811][ C1] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 89.041416][ C1] kasan_kmalloc+0x9/0x10 [ 89.045721][ C1] __kmalloc+0x163/0x770 [ 89.049949][ C1] ip_set_alloc+0x38/0x5e [ 89.054252][ C1] bitmap_ipmac_create+0x4e8/0xa00 [ 89.059335][ C1] ip_set_create+0x6f1/0x1500 [ 89.063991][ C1] nfnetlink_rcv_msg+0xcf2/0xfb0 [ 89.068900][ C1] netlink_rcv_skb+0x177/0x450 [ 89.073638][ C1] nfnetlink_rcv+0x1ba/0x460 [ 89.078200][ C1] netlink_unicast+0x58c/0x7d0 [ 89.082936][ C1] netlink_sendmsg+0x91c/0xea0 [ 89.087681][ C1] sock_sendmsg+0xd7/0x130 [ 89.092078][ C1] ____sys_sendmsg+0x753/0x880 [ 89.096829][ C1] ___sys_sendmsg+0x100/0x170 [ 89.101481][ C1] __sys_sendmsg+0x105/0x1d0 [ 89.106047][ C1] __x64_sys_sendmsg+0x78/0xb0 [ 89.110790][ C1] do_syscall_64+0xfa/0x790 [ 89.115271][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 89.121132][ C1] [ 89.123439][ C1] Freed by task 9546: [ 89.127414][ C1] save_stack+0x23/0x90 [ 89.131545][ C1] __kasan_slab_free+0x102/0x150 [ 89.136471][ C1] kasan_slab_free+0xe/0x10 [ 89.140963][ C1] kfree+0x10a/0x2c0 [ 89.144840][ C1] single_release+0x95/0xc0 [ 89.149338][ C1] __fput+0x2ff/0x890 [ 89.153303][ C1] ____fput+0x16/0x20 [ 89.157263][ C1] task_work_run+0x145/0x1c0 [ 89.161834][ C1] exit_to_usermode_loop+0x316/0x380 [ 89.167154][ C1] do_syscall_64+0x676/0x790 [ 89.171726][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 89.177594][ C1] [ 89.179905][ C1] The buggy address belongs to the object at ffff8880a370e900 [ 89.179905][ C1] which belongs to the cache kmalloc-32 of size 32 [ 89.193814][ C1] The buggy address is located 0 bytes inside of [ 89.193814][ C1] 32-byte region [ffff8880a370e900, ffff8880a370e920) [ 89.206795][ C1] The buggy address belongs to the page: [ 89.212417][ C1] page:ffffea00028dc380 refcount:1 mapcount:0 mapping:ffff8880aa4001c0 index:0xffff8880a370efc1 [ 89.222804][ C1] raw: 00fffe0000000200 ffffea00029c8e88 ffffea0002a64b88 ffff8880aa4001c0 [ 89.231373][ C1] raw: ffff8880a370efc1 ffff8880a370e000 000000010000003e 0000000000000000 [ 89.239946][ C1] page dumped because: kasan: bad access detected [ 89.246341][ C1] [ 89.248645][ C1] Memory state around the buggy address: [ 89.254253][ C1] ffff8880a370e800: 00 00 fc fc fc fc fc fc fb fb fb fb fc fc fc fc [ 89.262290][ C1] ffff8880a370e880: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc [ 89.270324][ C1] >ffff8880a370e900: 04 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc [ 89.278710][ C1] ^ [ 89.282760][ C1] ffff8880a370e980: 00 00 00 06 fc fc fc fc 00 00 00 00 fc fc fc fc executing program executing program executing program executing program executing program executing program executing program executing program [ 89.290795][ C1] ffff8880a370ea00: fb fb fb fb fc fc fc fc 02 fc fc fc fc fc fc fc [ 89.298827][ C1] ================================================================== [ 89.306870][ C1] Disabling lock debugging due to kernel taint [ 89.313072][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 89.319662][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Tainted: G B 5.5.0-rc7-syzkaller #0 [ 89.329195][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 89.339241][ C1] Call Trace: [ 89.342537][ C1] dump_stack+0x197/0x210 [ 89.346869][ C1] panic+0x2e3/0x75c [ 89.350759][ C1] ? add_taint.cold+0x16/0x16 [ 89.355438][ C1] ? retint_kernel+0x2b/0x2b [ 89.360032][ C1] ? trace_hardirqs_on+0x5e/0x240 [ 89.365058][ C1] ? bitmap_ipmac_gc+0x119/0x590 [ 89.369994][ C1] end_report+0x47/0x4f [ 89.374154][ C1] ? bitmap_ipmac_gc+0x119/0x590 [ 89.379090][ C1] __kasan_report.cold+0xe/0x41 [ 89.383940][ C1] ? bitmap_ipmac_gc+0x119/0x590 [ 89.388869][ C1] kasan_report+0x12/0x20 [ 89.393189][ C1] check_memory_region+0x134/0x1a0 [ 89.398297][ C1] __kasan_check_read+0x11/0x20 [ 89.403145][ C1] bitmap_ipmac_gc+0x119/0x590 [ 89.407917][ C1] call_timer_fn+0x1ac/0x780 [ 89.412508][ C1] ? bitmap_ipmac_list+0x1080/0x1080 [ 89.417795][ C1] ? msleep_interruptible+0x150/0x150 [ 89.423165][ C1] ? run_timer_softirq+0x6b1/0x1790 [ 89.428368][ C1] ? trace_hardirqs_on+0x67/0x240 [ 89.433391][ C1] ? bitmap_ipmac_list+0x1080/0x1080 [ 89.438672][ C1] ? bitmap_ipmac_list+0x1080/0x1080 [ 89.443962][ C1] run_timer_softirq+0x6c3/0x1790 [ 89.448990][ C1] ? add_timer+0x930/0x930 [ 89.453401][ C1] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 89.459551][ C1] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 89.465094][ C1] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 89.471069][ C1] ? trace_hardirqs_on+0x67/0x240 [ 89.476087][ C1] __do_softirq+0x262/0x98c [ 89.480597][ C1] ? takeover_tasklets+0x820/0x820 [ 89.485704][ C1] run_ksoftirqd+0x8e/0x110 [ 89.490206][ C1] smpboot_thread_fn+0x6a3/0xa40 [ 89.495159][ C1] ? __smpboot_create_thread.part.0+0x340/0x340 [ 89.501399][ C1] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 89.507639][ C1] ? __kthread_parkme+0x108/0x1c0 [ 89.512669][ C1] ? __kasan_check_read+0x11/0x20 [ 89.517692][ C1] kthread+0x361/0x430 [ 89.521766][ C1] ? __smpboot_create_thread.part.0+0x340/0x340 [ 89.527996][ C1] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 89.533705][ C1] ret_from_fork+0x24/0x30 [ 89.539756][ C1] Kernel Offset: disabled [ 89.544094][ C1] Rebooting in 86400 seconds..