[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 88.300580][ T27] audit: type=1800 audit(1580288574.382:25): pid=9382 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 88.340934][ T27] audit: type=1800 audit(1580288574.382:26): pid=9382 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 88.340959][ T27] audit: type=1800 audit(1580288574.382:27): pid=9382 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 '10.128.0.241' (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 syzkaller login: [ 102.621037][ C0] ================================================================== [ 102.629381][ C0] BUG: KASAN: slab-out-of-bounds in bitmap_ip_gc+0x100/0x4f0 [ 102.637294][ C0] Read of size 8 at addr ffff8880958a9bc0 by task syz-executor979/9860 [ 102.645535][ C0] [ 102.647960][ C0] CPU: 0 PID: 9860 Comm: syz-executor979 Not tainted 5.5.0-rc6-next-20200116-syzkaller #0 [ 102.657958][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 102.668064][ C0] Call Trace: [ 102.671367][ C0] [ 102.674237][ C0] dump_stack+0x197/0x210 [ 102.678574][ C0] ? bitmap_ip_gc+0x100/0x4f0 [ 102.683735][ C0] print_address_description.constprop.0.cold+0xd4/0x30b [ 102.690926][ C0] ? bitmap_ip_gc+0x100/0x4f0 [ 102.695601][ C0] ? bitmap_ip_gc+0x100/0x4f0 [ 102.700407][ C0] __kasan_report.cold+0x1b/0x32 [ 102.705430][ C0] ? bitmap_ip_gc+0x100/0x4f0 [ 102.710111][ C0] kasan_report+0x12/0x20 [ 102.714496][ C0] check_memory_region+0x134/0x1a0 [ 102.719747][ C0] __kasan_check_read+0x11/0x20 [ 102.724603][ C0] bitmap_ip_gc+0x100/0x4f0 [ 102.729104][ C0] call_timer_fn+0x1ac/0x780 [ 102.733747][ C0] ? bitmap_ip_test+0x170/0x170 [ 102.738881][ C0] ? msleep_interruptible+0x150/0x150 [ 102.744244][ C0] ? run_timer_softirq+0x6b1/0x1790 [ 102.749595][ C0] ? trace_hardirqs_on+0x67/0x240 [ 102.754918][ C0] ? bitmap_ip_test+0x170/0x170 [ 102.759866][ C0] ? bitmap_ip_test+0x170/0x170 [ 102.764725][ C0] run_timer_softirq+0x6c3/0x1790 [ 102.769849][ C0] ? add_timer+0x930/0x930 [ 102.774413][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 102.780562][ C0] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 102.786158][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 102.792157][ C0] ? trace_hardirqs_on+0x67/0x240 [ 102.797185][ C0] __do_softirq+0x262/0x98c [ 102.801679][ C0] ? sched_clock_cpu+0x1b/0x1b0 [ 102.806594][ C0] irq_exit+0x19b/0x1e0 [ 102.810800][ C0] smp_apic_timer_interrupt+0x1a3/0x610 [ 102.816350][ C0] apic_timer_interrupt+0xf/0x20 [ 102.821318][ C0] [ 102.824374][ C0] RIP: 0010:do_page_fault+0xa31/0x12e1 [ 102.829864][ C0] Code: ff df 48 c1 e8 03 80 3c 10 00 0f 85 af 07 00 00 48 83 3d e9 b4 7f 08 00 0f 84 06 06 00 00 e8 26 92 41 00 fb 66 0f 1f 44 00 00 45 c0 54 00 00 00 e9 6e f8 ff ff e8 0e 92 41 00 48 8b 45 c8 48 [ 102.849492][ C0] RSP: 0000:ffffc90007e47ed8 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 [ 102.858422][ C0] RAX: ffff88809bfd8600 RBX: 00000000006d1000 RCX: 0000000000000000 [ 102.866394][ C0] RDX: 0000000000000000 RSI: ffffffff813405aa RDI: ffff88809bfd8e9c [ 102.874475][ C0] RBP: ffffc90007e47f48 R08: ffff88809bfd8600 R09: 0000000000000000 [ 102.882941][ C0] R10: 0000000000000000 R11: 0000000000000000 R12: 00000000006d1680 [ 102.890984][ C0] R13: ffffc90007e47f58 R14: 0000000000000007 R15: ffffc90007e47fe0 [ 102.898980][ C0] ? do_page_fault+0xa2a/0x12e1 [ 102.904000][ C0] ? do_page_fault+0xa2a/0x12e1 [ 102.908858][ C0] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 102.914542][ C0] page_fault+0x39/0x40 [ 102.918688][ C0] RIP: 0033:0x43fee1 [ 102.922575][ C0] Code: 00 01 00 00 00 74 23 66 90 48 8b 03 48 8b 50 18 48 85 d2 74 05 ff d2 48 8b 03 48 8b 5b 08 c7 40 28 01 00 00 00 48 85 db 75 df 05 95 17 29 00 00 00 00 00 48 8d 65 e0 44 89 e8 5b 41 5c 41 5d [ 102.942232][ C0] RSP: 002b:00007ffc58219090 EFLAGS: 00010246 [ 102.948989][ C0] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000043fdfa [ 102.956955][ C0] RDX: 0000003926448565 RSI: 0000000000000000 RDI: 0000000001200011 [ 102.964953][ C0] RBP: 00007ffc582190b0 R08: 0000000000000000 R09: 00000000013e6880 [ 102.973277][ C0] R10: 00000000013e6b50 R11: 0000000000000246 R12: 0000000000000000 [ 102.981501][ C0] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 102.989595][ C0] [ 102.991943][ C0] Allocated by task 9534: [ 102.996322][ C0] save_stack+0x23/0x90 [ 103.000567][ C0] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 103.006261][ C0] kasan_kmalloc+0x9/0x10 [ 103.010589][ C0] __kmalloc+0x163/0x770 [ 103.014820][ C0] ip_set_alloc+0x38/0x5e [ 103.019229][ C0] bitmap_ip_create+0x6ec/0xc20 [ 103.024166][ C0] ip_set_create+0x6f1/0x1500 [ 103.028984][ C0] nfnetlink_rcv_msg+0xcf2/0xfb0 [ 103.033912][ C0] netlink_rcv_skb+0x177/0x450 [ 103.038959][ C0] nfnetlink_rcv+0x1ba/0x460 [ 103.043548][ C0] netlink_unicast+0x59e/0x7e0 [ 103.048297][ C0] netlink_sendmsg+0x91c/0xea0 [ 103.053065][ C0] sock_sendmsg+0xd7/0x130 [ 103.057477][ C0] ____sys_sendmsg+0x753/0x880 [ 103.062277][ C0] ___sys_sendmsg+0x100/0x170 [ 103.067197][ C0] __sys_sendmsg+0x105/0x1d0 [ 103.071789][ C0] __x64_sys_sendmsg+0x78/0xb0 [ 103.076671][ C0] do_syscall_64+0xfa/0x790 [ 103.081202][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 103.087301][ C0] [ 103.089634][ C0] Freed by task 4232: [ 103.093705][ C0] save_stack+0x23/0x90 [ 103.097876][ C0] __kasan_slab_free+0x102/0x150 [ 103.102926][ C0] kasan_slab_free+0xe/0x10 [ 103.107415][ C0] kfree+0x10a/0x2c0 [ 103.111430][ C0] tty_ldisc_put+0x4e/0x80 [ 103.115842][ C0] tty_ldisc_kill+0xc3/0x160 [ 103.120481][ C0] tty_ldisc_release+0xe9/0x2b0 [ 103.125420][ C0] tty_release_struct+0x1b/0x50 [ 103.130327][ C0] tty_release+0xbcb/0xe90 [ 103.134786][ C0] __fput+0x2ff/0x890 [ 103.138812][ C0] ____fput+0x16/0x20 [ 103.142831][ C0] task_work_run+0x145/0x1c0 [ 103.147630][ C0] exit_to_usermode_loop+0x316/0x380 [ 103.152930][ C0] do_syscall_64+0x676/0x790 [ 103.158466][ C0] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 103.164568][ C0] [ 103.167366][ C0] The buggy address belongs to the object at ffff8880958a9bc0 [ 103.167366][ C0] which belongs to the cache kmalloc-32 of size 32 [ 103.181879][ C0] The buggy address is located 0 bytes inside of [ 103.181879][ C0] 32-byte region [ffff8880958a9bc0, ffff8880958a9be0) [ 103.195156][ C0] The buggy address belongs to the page: [ 103.201099][ C0] page:ffffea0002562a40 refcount:1 mapcount:0 mapping:ffff8880aa4001c0 index:0xffff8880958a9fc1 [ 103.211545][ C0] flags: 0xfffe0000000200(slab) [ 103.216396][ C0] raw: 00fffe0000000200 ffffea0002790688 ffffea000255e6c8 ffff8880aa4001c0 [ 103.225093][ C0] raw: ffff8880958a9fc1 ffff8880958a9000 0000000100000029 0000000000000000 [ 103.233709][ C0] page dumped because: kasan: bad access detected [ 103.240208][ C0] [ 103.242523][ C0] Memory state around the buggy address: [ 103.248150][ C0] ffff8880958a9a80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc [ 103.256388][ C0] ffff8880958a9b00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc [ 103.264658][ C0] >ffff8880958a9b80: fb fb fb fb fc fc fc fc 04 fc fc fc fc fc fc fc [ 103.274219][ C0] ^ [ 103.280367][ C0] ffff8880958a9c00: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc [ 103.288425][ C0] ffff8880958a9c80: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc [ 103.296654][ C0] ================================================================== [ 103.304715][ C0] Disabling lock debugging due to kernel taint [ 103.311008][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 103.317802][ C0] CPU: 0 PID: 9860 Comm: syz-executor979 Tainted: G B 5.5.0-rc6-next-20200116-syzkaller #0 [ 103.329085][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 103.339481][ C0] Call Trace: [ 103.343200][ C0] [ 103.346177][ C0] dump_stack+0x197/0x210 [ 103.350529][ C0] panic+0x2e3/0x75c [ 103.354475][ C0] ? add_taint.cold+0x16/0x16 [ 103.359166][ C0] ? retint_kernel+0x2b/0x2b [ 103.363747][ C0] ? trace_hardirqs_on+0x5e/0x240 [ 103.368786][ C0] ? bitmap_ip_gc+0x100/0x4f0 [ 103.373486][ C0] end_report+0x47/0x4f [ 103.377725][ C0] ? bitmap_ip_gc+0x100/0x4f0 [ 103.382513][ C0] __kasan_report.cold+0xe/0x32 [ 103.387552][ C0] ? bitmap_ip_gc+0x100/0x4f0 [ 103.392594][ C0] kasan_report+0x12/0x20 [ 103.396926][ C0] check_memory_region+0x134/0x1a0 [ 103.402034][ C0] __kasan_check_read+0x11/0x20 [ 103.407048][ C0] bitmap_ip_gc+0x100/0x4f0 [ 103.411666][ C0] call_timer_fn+0x1ac/0x780 [ 103.416353][ C0] ? bitmap_ip_test+0x170/0x170 [ 103.421214][ C0] ? msleep_interruptible+0x150/0x150 [ 103.426575][ C0] ? run_timer_softirq+0x6b1/0x1790 [ 103.431772][ C0] ? trace_hardirqs_on+0x67/0x240 [ 103.436786][ C0] ? bitmap_ip_test+0x170/0x170 [ 103.441631][ C0] ? bitmap_ip_test+0x170/0x170 [ 103.446484][ C0] run_timer_softirq+0x6c3/0x1790 [ 103.451690][ C0] ? add_timer+0x930/0x930 [ 103.456107][ C0] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 103.462655][ C0] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 103.468222][ C0] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 103.474263][ C0] ? trace_hardirqs_on+0x67/0x240 [ 103.480155][ C0] __do_softirq+0x262/0x98c [ 103.484656][ C0] ? sched_clock_cpu+0x1b/0x1b0 [ 103.489676][ C0] irq_exit+0x19b/0x1e0 [ 103.493827][ C0] smp_apic_timer_interrupt+0x1a3/0x610 [ 103.499353][ C0] apic_timer_interrupt+0xf/0x20 [ 103.504313][ C0] [ 103.507278][ C0] RIP: 0010:do_page_fault+0xa31/0x12e1 [ 103.512795][ C0] Code: ff df 48 c1 e8 03 80 3c 10 00 0f 85 af 07 00 00 48 83 3d e9 b4 7f 08 00 0f 84 06 06 00 00 e8 26 92 41 00 fb 66 0f 1f 44 00 00 45 c0 54 00 00 00 e9 6e f8 ff ff e8 0e 92 41 00 48 8b 45 c8 48 [ 103.532506][ C0] RSP: 0000:ffffc90007e47ed8 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 [ 103.540909][ C0] RAX: ffff88809bfd8600 RBX: 00000000006d1000 RCX: 0000000000000000 [ 103.548927][ C0] RDX: 0000000000000000 RSI: ffffffff813405aa RDI: ffff88809bfd8e9c [ 103.556942][ C0] RBP: ffffc90007e47f48 R08: ffff88809bfd8600 R09: 0000000000000000 [ 103.565122][ C0] R10: 0000000000000000 R11: 0000000000000000 R12: 00000000006d1680 [ 103.573085][ C0] R13: ffffc90007e47f58 R14: 0000000000000007 R15: ffffc90007e47fe0 [ 103.581117][ C0] ? do_page_fault+0xa2a/0x12e1 [ 103.586005][ C0] ? do_page_fault+0xa2a/0x12e1 [ 103.590855][ C0] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 103.596425][ C0] page_fault+0x39/0x40 [ 103.600562][ C0] RIP: 0033:0x43fee1 [ 103.604446][ C0] Code: 00 01 00 00 00 74 23 66 90 48 8b 03 48 8b 50 18 48 85 d2 74 05 ff d2 48 8b 03 48 8b 5b 08 c7 40 28 01 00 00 00 48 85 db 75 df 05 95 17 29 00 00 00 00 00 48 8d 65 e0 44 89 e8 5b 41 5c 41 5d [ 103.624330][ C0] RSP: 002b:00007ffc58219090 EFLAGS: 00010246 [ 103.630379][ C0] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000043fdfa [ 103.638345][ C0] RDX: 0000003926448565 RSI: 0000000000000000 RDI: 0000000001200011 [ 103.646310][ C0] RBP: 00007ffc582190b0 R08: 0000000000000000 R09: 00000000013e6880 [ 103.654373][ C0] R10: 00000000013e6b50 R11: 0000000000000246 R12: 0000000000000000 [ 103.662334][ C0] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 103.671730][ C0] Kernel Offset: disabled [ 103.676070][ C0] Rebooting in 86400 seconds..