[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 55.635555][ T27] audit: type=1800 audit(1579869767.667:25): pid=8505 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 55.655207][ T27] audit: type=1800 audit(1579869767.667:26): pid=8505 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 55.703956][ T27] audit: type=1800 audit(1579869767.667:27): pid=8505 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 '10.128.0.178' (ECDSA) to the list of known hosts. executing program executing program syzkaller login: [ 65.819448][ T8657] ================================================================== [ 65.829536][ T8657] BUG: KASAN: slab-out-of-bounds in bitmap_ipmac_destroy+0x1d2/0x3c0 [ 65.841885][ T8657] Read of size 8 at addr ffff8880a71e5e00 by task syz-executor455/8657 [ 65.851553][ T8657] [ 65.854492][ T8657] CPU: 1 PID: 8657 Comm: syz-executor455 Not tainted 5.5.0-rc7-syzkaller #0 [ 65.866861][ T8657] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 65.877395][ T8657] Call Trace: [ 65.880902][ T8657] dump_stack+0x1fb/0x318 [ 65.885602][ T8657] print_address_description+0x74/0x5c0 [ 65.891229][ T8657] ? vprintk_default+0x28/0x30 [ 65.896519][ T8657] ? vprintk_func+0x158/0x170 [ 65.902771][ T8657] ? printk+0x62/0x8d [ 65.907261][ T8657] __kasan_report+0x149/0x1c0 [ 65.913015][ T8657] ? bitmap_ipmac_destroy+0x1d2/0x3c0 [ 65.918703][ T8657] ? __kmalloc+0x26c/0x340 [ 65.924560][ T8657] kasan_report+0x26/0x50 [ 65.929316][ T8657] ? __kmalloc+0x26c/0x340 [ 65.934387][ T8657] check_memory_region+0x2b6/0x2f0 [ 65.941091][ T8657] __kasan_check_read+0x11/0x20 [ 65.947084][ T8657] bitmap_ipmac_destroy+0x1d2/0x3c0 [ 65.952526][ T8657] ip_set_create+0xae0/0xfd0 [ 65.957856][ T8657] ? ip_set_protocol+0x5b0/0x5b0 [ 65.963208][ T8657] nfnetlink_rcv_msg+0x9ae/0xcd0 [ 65.970281][ T8657] ? cap_capable+0x25b/0x290 [ 65.976313][ T8657] ? cap_capable+0x25b/0x290 [ 65.981313][ T8657] netlink_rcv_skb+0x19e/0x3e0 [ 65.987954][ T8657] ? nfnetlink_bind+0x250/0x250 [ 65.993977][ T8657] nfnetlink_rcv+0x1e0/0x1e50 [ 65.999104][ T8657] ? rcu_lock_release+0x9/0x30 [ 66.004257][ T8657] ? rcu_lock_release+0x21/0x30 [ 66.009761][ T8657] ? netlink_deliver_tap+0x142/0x880 [ 66.015483][ T8657] netlink_unicast+0x767/0x920 [ 66.020358][ T8657] netlink_sendmsg+0xa2c/0xd50 [ 66.025678][ T8657] ? netlink_getsockopt+0x9f0/0x9f0 [ 66.031164][ T8657] ____sys_sendmsg+0x4f7/0x7f0 [ 66.036457][ T8657] __sys_sendmsg+0x1ed/0x290 [ 66.041228][ T8657] ? up_read+0x1d/0x20 [ 66.045484][ T8657] ? do_user_addr_fault+0x654/0xaf0 [ 66.051176][ T8657] ? check_preemption_disabled+0xb4/0x260 [ 66.057087][ T8657] ? debug_smp_processor_id+0x9/0x20 [ 66.062487][ T8657] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 66.068173][ T8657] ? trace_irq_disable_rcuidle+0x23/0x1e0 [ 66.073889][ T8657] ? do_syscall_64+0x1d/0x1c0 [ 66.078560][ T8657] __x64_sys_sendmsg+0x7f/0x90 [ 66.083584][ T8657] do_syscall_64+0xf7/0x1c0 [ 66.088243][ T8657] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 66.094292][ T8657] RIP: 0033:0x4413f9 [ 66.098179][ T8657] Code: e8 fc ab 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 9b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 66.118186][ T8657] RSP: 002b:00007ffdcc88fa08 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 66.127069][ T8657] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004413f9 [ 66.135284][ T8657] RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000003 [ 66.143403][ T8657] RBP: 00000000000100d9 R08: 00000000004002c8 R09: 00000000004002c8 [ 66.151721][ T8657] R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000402220 [ 66.160188][ T8657] R13: 00000000004022b0 R14: 0000000000000000 R15: 0000000000000000 [ 66.168669][ T8657] [ 66.171078][ T8657] Allocated by task 8657: [ 66.175411][ T8657] __kasan_kmalloc+0x118/0x1c0 [ 66.180251][ T8657] kasan_kmalloc+0x9/0x10 [ 66.185004][ T8657] __kmalloc+0x254/0x340 [ 66.189473][ T8657] kzalloc+0x21/0x40 [ 66.193664][ T8657] ip_set_alloc+0x32/0x60 [ 66.198109][ T8657] bitmap_ipmac_create+0x3d9/0x840 [ 66.203690][ T8657] ip_set_create+0x421/0xfd0 [ 66.208311][ T8657] nfnetlink_rcv_msg+0x9ae/0xcd0 [ 66.213656][ T8657] netlink_rcv_skb+0x19e/0x3e0 [ 66.218698][ T8657] nfnetlink_rcv+0x1e0/0x1e50 [ 66.223885][ T8657] netlink_unicast+0x767/0x920 [ 66.228802][ T8657] netlink_sendmsg+0xa2c/0xd50 [ 66.233582][ T8657] ____sys_sendmsg+0x4f7/0x7f0 [ 66.238496][ T8657] __sys_sendmsg+0x1ed/0x290 [ 66.243376][ T8657] __x64_sys_sendmsg+0x7f/0x90 [ 66.248135][ T8657] do_syscall_64+0xf7/0x1c0 [ 66.252795][ T8657] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 66.258878][ T8657] [ 66.261603][ T8657] Freed by task 0: [ 66.265315][ T8657] (stack is not available) [ 66.269938][ T8657] [ 66.272411][ T8657] The buggy address belongs to the object at ffff8880a71e4000 [ 66.272411][ T8657] which belongs to the cache kmalloc-8k of size 8192 [ 66.288959][ T8657] The buggy address is located 7680 bytes inside of [ 66.288959][ T8657] 8192-byte region [ffff8880a71e4000, ffff8880a71e6000) [ 66.302966][ T8657] The buggy address belongs to the page: [ 66.308756][ T8657] page:ffffea00029c7900 refcount:1 mapcount:0 mapping:ffff8880aa8021c0 index:0x0 compound_mapcount: 0 [ 66.319834][ T8657] raw: 00fffe0000010200 ffffea000230b908 ffff8880aa801b48 ffff8880aa8021c0 [ 66.328611][ T8657] raw: 0000000000000000 ffff8880a71e4000 0000000100000001 0000000000000000 [ 66.337594][ T8657] page dumped because: kasan: bad access detected [ 66.344059][ T8657] [ 66.346629][ T8657] Memory state around the buggy address: [ 66.352664][ T8657] ffff8880a71e5d00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 66.360718][ T8657] ffff8880a71e5d80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 66.370024][ T8657] >ffff8880a71e5e00: 04 fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 66.378735][ T8657] ^ [ 66.383525][ T8657] ffff8880a71e5e80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 66.391577][ T8657] ffff8880a71e5f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 66.400026][ T8657] ================================================================== [ 66.408753][ T8657] Disabling lock debugging due to kernel taint [ 66.415670][ T8657] Kernel panic - not syncing: panic_on_warn set ... [ 66.422326][ T8657] CPU: 1 PID: 8657 Comm: syz-executor455 Tainted: G B 5.5.0-rc7-syzkaller #0 [ 66.432814][ T8657] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 66.443126][ T8657] Call Trace: [ 66.446690][ T8657] dump_stack+0x1fb/0x318 [ 66.451016][ T8657] panic+0x264/0x7a9 [ 66.455088][ T8657] ? __kasan_report+0x193/0x1c0 [ 66.460087][ T8657] ? trace_hardirqs_on+0x34/0x80 [ 66.465259][ T8657] ? __kasan_report+0x193/0x1c0 [ 66.470097][ T8657] __kasan_report+0x1b9/0x1c0 [ 66.475021][ T8657] ? bitmap_ipmac_destroy+0x1d2/0x3c0 [ 66.480500][ T8657] ? __kmalloc+0x26c/0x340 [ 66.484982][ T8657] kasan_report+0x26/0x50 [ 66.489306][ T8657] ? __kmalloc+0x26c/0x340 [ 66.493800][ T8657] check_memory_region+0x2b6/0x2f0 [ 66.499190][ T8657] __kasan_check_read+0x11/0x20 [ 66.504031][ T8657] bitmap_ipmac_destroy+0x1d2/0x3c0 [ 66.509220][ T8657] ip_set_create+0xae0/0xfd0 [ 66.514105][ T8657] ? ip_set_protocol+0x5b0/0x5b0 [ 66.519033][ T8657] nfnetlink_rcv_msg+0x9ae/0xcd0 [ 66.524300][ T8657] ? cap_capable+0x25b/0x290 [ 66.529294][ T8657] ? cap_capable+0x25b/0x290 [ 66.534166][ T8657] netlink_rcv_skb+0x19e/0x3e0 [ 66.539749][ T8657] ? nfnetlink_bind+0x250/0x250 [ 66.545049][ T8657] nfnetlink_rcv+0x1e0/0x1e50 [ 66.550710][ T8657] ? rcu_lock_release+0x9/0x30 [ 66.556032][ T8657] ? rcu_lock_release+0x21/0x30 [ 66.561625][ T8657] ? netlink_deliver_tap+0x142/0x880 [ 66.567158][ T8657] netlink_unicast+0x767/0x920 [ 66.573882][ T8657] netlink_sendmsg+0xa2c/0xd50 [ 66.579450][ T8657] ? netlink_getsockopt+0x9f0/0x9f0 [ 66.585702][ T8657] ____sys_sendmsg+0x4f7/0x7f0 [ 66.591097][ T8657] __sys_sendmsg+0x1ed/0x290 [ 66.596030][ T8657] ? up_read+0x1d/0x20 [ 66.600867][ T8657] ? do_user_addr_fault+0x654/0xaf0 [ 66.607022][ T8657] ? check_preemption_disabled+0xb4/0x260 [ 66.614461][ T8657] ? debug_smp_processor_id+0x9/0x20 [ 66.620282][ T8657] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 66.626005][ T8657] ? trace_irq_disable_rcuidle+0x23/0x1e0 [ 66.632091][ T8657] ? do_syscall_64+0x1d/0x1c0 [ 66.637716][ T8657] __x64_sys_sendmsg+0x7f/0x90 [ 66.643455][ T8657] do_syscall_64+0xf7/0x1c0 [ 66.648453][ T8657] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 66.654840][ T8657] RIP: 0033:0x4413f9 [ 66.659009][ T8657] Code: e8 fc ab 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 9b 09 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 66.681035][ T8657] RSP: 002b:00007ffdcc88fa08 EFLAGS: 00000246 ORIG_RAX: 000000000000002e [ 66.690090][ T8657] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000004413f9 [ 66.700491][ T8657] RDX: 0000000000000000 RSI: 0000000020000300 RDI: 0000000000000003 [ 66.709314][ T8657] RBP: 00000000000100d9 R08: 00000000004002c8 R09: 00000000004002c8 [ 66.717783][ T8657] R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000402220 [ 66.726118][ T8657] R13: 00000000004022b0 R14: 0000000000000000 R15: 0000000000000000 [ 66.737725][ T8657] Kernel Offset: disabled [ 66.744331][ T8657] Rebooting in 86400 seconds..