[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 49.266347][ T27] audit: type=1800 audit(1579613796.726:25): pid=8372 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 49.289603][ T27] audit: type=1800 audit(1579613796.736:26): pid=8372 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 49.289622][ T27] audit: type=1800 audit(1579613796.736:27): pid=8372 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 '10.128.0.95' (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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 67.989649][ C1] ================================================================== [ 67.997862][ C1] BUG: KASAN: slab-out-of-bounds in bitmap_ipmac_gc+0x173/0x5d0 [ 68.005468][ C1] Read of size 8 at addr ffff8880a145e040 by task syz-executor828/9271 [ 68.013681][ C1] [ 68.015988][ C1] CPU: 1 PID: 9271 Comm: syz-executor828 Not tainted 5.5.0-rc7-syzkaller #0 [ 68.024738][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.034769][ C1] Call Trace: [ 68.038040][ C1] [ 68.040924][ C1] dump_stack+0x1fb/0x318 [ 68.045282][ C1] print_address_description+0x74/0x5c0 [ 68.050804][ C1] ? vprintk_default+0x28/0x30 [ 68.055583][ C1] ? vprintk_func+0x158/0x170 [ 68.060285][ C1] ? printk+0x62/0x8d [ 68.064248][ C1] __kasan_report+0x149/0x1c0 [ 68.068901][ C1] ? bitmap_ipmac_gc+0x173/0x5d0 [ 68.073816][ C1] kasan_report+0x26/0x50 [ 68.078120][ C1] check_memory_region+0x2b6/0x2f0 [ 68.083209][ C1] __kasan_check_read+0x11/0x20 [ 68.088057][ C1] bitmap_ipmac_gc+0x173/0x5d0 [ 68.092798][ C1] ? bitmap_ipmac_create+0x840/0x840 [ 68.098057][ C1] call_timer_fn+0x95/0x170 [ 68.102551][ C1] ? bitmap_ipmac_create+0x840/0x840 [ 68.107828][ C1] __run_timers+0x776/0x970 [ 68.112322][ C1] ? check_preemption_disabled+0x44/0x260 [ 68.118023][ C1] ? debug_smp_processor_id+0x9/0x20 [ 68.123291][ C1] run_timer_softirq+0x4a/0x90 [ 68.128034][ C1] __do_softirq+0x283/0x7bd [ 68.132524][ C1] ? irq_exit+0x227/0x230 [ 68.136837][ C1] irq_exit+0x227/0x230 [ 68.140968][ C1] smp_apic_timer_interrupt+0x113/0x280 [ 68.146486][ C1] apic_timer_interrupt+0xf/0x20 [ 68.151392][ C1] [ 68.154306][ C1] RIP: 0010:kmem_cache_free+0xc8/0xf0 [ 68.159651][ C1] Code: 58 07 00 74 42 4c 89 f7 57 9d 0f 1f 44 00 00 e8 be d6 c9 ff eb 19 e8 57 d4 c9 ff 48 83 3d 47 43 58 07 00 74 24 4c 89 f7 57 9d <0f> 1f 44 00 00 4c 89 e7 4c 89 fe e8 68 01 00 00 5b 41 5c 41 5e 41 [ 68.179229][ C1] RSP: 0018:ffffc90004dd79a0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 68.187613][ C1] RAX: ffff88809faa0c94 RBX: ffff8880aa812a80 RCX: ffff88809faa0400 [ 68.195570][ C1] RDX: 0000000000000000 RSI: ffffffff81a45c14 RDI: 0000000000000282 [ 68.203516][ C1] RBP: ffffc90004dd79c0 R08: ffff88809faa0c58 R09: ffffc90004dd77c4 [ 68.211474][ C1] R10: 0000000000000012 R11: 0000000000000000 R12: ffffffff81a45c14 [ 68.219682][ C1] R13: dffffc0000000000 R14: 0000000000000282 R15: ffff88808ede90b0 [ 68.227637][ C1] ? ptlock_free+0x44/0x50 [ 68.232030][ C1] ? ptlock_free+0x44/0x50 [ 68.236429][ C1] ptlock_free+0x44/0x50 [ 68.240671][ C1] ___pmd_free_tlb+0xb2/0x120 [ 68.245323][ C1] free_pgd_range+0xaa5/0xe90 [ 68.249974][ C1] ? debug_smp_processor_id+0x9/0x20 [ 68.255259][ C1] free_pgtables+0x2c0/0x300 [ 68.259840][ C1] exit_mmap+0x290/0x540 [ 68.264257][ C1] __mmput+0x120/0x3a0 [ 68.268310][ C1] mmput+0x5d/0x70 [ 68.272004][ C1] exit_mm+0x4f4/0x580 [ 68.276057][ C1] do_exit+0x572/0x2000 [ 68.280190][ C1] ? __up_read+0x231/0x740 [ 68.284589][ C1] do_group_exit+0x15c/0x2b0 [ 68.289157][ C1] __do_sys_exit_group+0x17/0x20 [ 68.294081][ C1] __se_sys_exit_group+0x14/0x20 [ 68.298992][ C1] __x64_sys_exit_group+0x3b/0x40 [ 68.303988][ C1] do_syscall_64+0xf7/0x1c0 [ 68.308467][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 68.314333][ C1] RIP: 0033:0x440068 [ 68.318228][ C1] Code: Bad RIP value. [ 68.322286][ C1] RSP: 002b:00007fff0740e958 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 68.330671][ C1] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440068 [ 68.338614][ C1] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 68.346567][ C1] RBP: 00000000004bf8f0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 68.354523][ C1] R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000001 [ 68.362468][ C1] R13: 00000000006d1180 R14: 0000000000000000 R15: 0000000000000000 [ 68.370423][ C1] [ 68.372728][ C1] Allocated by task 8525: [ 68.377034][ C1] __kasan_kmalloc+0x118/0x1c0 [ 68.381772][ C1] kasan_kmalloc+0x9/0x10 [ 68.386078][ C1] __kmalloc+0x254/0x340 [ 68.390298][ C1] kzalloc+0x21/0x40 [ 68.394164][ C1] ip_set_alloc+0x32/0x60 [ 68.398467][ C1] bitmap_ipmac_create+0x3d9/0x840 [ 68.403551][ C1] ip_set_create+0x421/0xfd0 [ 68.408133][ C1] nfnetlink_rcv_msg+0x9ae/0xcd0 [ 68.413045][ C1] netlink_rcv_skb+0x19e/0x3e0 [ 68.417779][ C1] nfnetlink_rcv+0x1e0/0x1e50 [ 68.422431][ C1] netlink_unicast+0x767/0x920 [ 68.427165][ C1] netlink_sendmsg+0xa2c/0xd50 [ 68.431919][ C1] ____sys_sendmsg+0x4f7/0x7f0 [ 68.436663][ C1] __sys_sendmsg+0x1ed/0x290 [ 68.441226][ C1] __x64_sys_sendmsg+0x7f/0x90 [ 68.445966][ C1] do_syscall_64+0xf7/0x1c0 [ 68.450442][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 68.456315][ C1] [ 68.458619][ C1] Freed by task 8246: [ 68.462573][ C1] __kasan_slab_free+0x12e/0x1e0 [ 68.467483][ C1] kasan_slab_free+0xe/0x10 [ 68.471959][ C1] kfree+0x10d/0x220 [ 68.475826][ C1] single_release+0x91/0xa0 [ 68.480306][ C1] __fput+0x2e4/0x740 [ 68.484280][ C1] ____fput+0x15/0x20 [ 68.488247][ C1] task_work_run+0x176/0x1b0 [ 68.492827][ C1] prepare_exit_to_usermode+0x480/0x5b0 [ 68.498455][ C1] syscall_return_slowpath+0x113/0x4a0 [ 68.503884][ C1] do_syscall_64+0x11f/0x1c0 [ 68.508449][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 68.514321][ C1] [ 68.516635][ C1] The buggy address belongs to the object at ffff8880a145e040 [ 68.516635][ C1] which belongs to the cache kmalloc-32 of size 32 [ 68.530484][ C1] The buggy address is located 0 bytes inside of [ 68.530484][ C1] 32-byte region [ffff8880a145e040, ffff8880a145e060) [ 68.543463][ C1] The buggy address belongs to the page: [ 68.549069][ C1] page:ffffea0002851780 refcount:1 mapcount:0 mapping:ffff8880aa8001c0 index:0xffff8880a145efc1 [ 68.559469][ C1] raw: 00fffe0000000200 ffffea0002509e48 ffffea0002575188 ffff8880aa8001c0 [ 68.568036][ C1] raw: ffff8880a145efc1 ffff8880a145e000 000000010000003d 0000000000000000 [ 68.576600][ C1] page dumped because: kasan: bad access detected [ 68.582983][ C1] [ 68.585284][ C1] Memory state around the buggy address: [ 68.590890][ C1] ffff8880a145df00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 68.598922][ C1] ffff8880a145df80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 68.606964][ C1] >ffff8880a145e000: 02 fc fc fc fc fc fc fc 04 fc fc fc fc fc fc fc [ 68.615006][ C1] ^ [ 68.621134][ C1] ffff8880a145e080: fb fb fb fb fc fc fc fc 07 fc fc fc fc fc fc fc [ 68.629171][ C1] ffff8880a145e100: 07 fc fc fc fc fc fc fc 07 fc fc fc fc fc fc fc [ 68.637263][ C1] ================================================================== [ 68.645302][ C1] Disabling lock debugging due to kernel taint [ 68.651505][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 68.658082][ C1] CPU: 1 PID: 9271 Comm: syz-executor828 Tainted: G B 5.5.0-rc7-syzkaller #0 [ 68.668251][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.678283][ C1] Call Trace: [ 68.681737][ C1] [ 68.684659][ C1] dump_stack+0x1fb/0x318 [ 68.689082][ C1] panic+0x264/0x7a9 [ 68.692964][ C1] ? __kasan_report+0x193/0x1c0 [ 68.697789][ C1] ? trace_hardirqs_on+0x34/0x80 [ 68.702750][ C1] ? _raw_spin_unlock_irqrestore+0xa8/0xe0 [ 68.708572][ C1] __kasan_report+0x1b9/0x1c0 [ 68.713223][ C1] ? bitmap_ipmac_gc+0x173/0x5d0 [ 68.718133][ C1] kasan_report+0x26/0x50 [ 68.722439][ C1] check_memory_region+0x2b6/0x2f0 [ 68.728125][ C1] __kasan_check_read+0x11/0x20 [ 68.732951][ C1] bitmap_ipmac_gc+0x173/0x5d0 [ 68.737697][ C1] ? bitmap_ipmac_create+0x840/0x840 [ 68.742961][ C1] call_timer_fn+0x95/0x170 [ 68.747439][ C1] ? bitmap_ipmac_create+0x840/0x840 [ 68.752755][ C1] __run_timers+0x776/0x970 [ 68.757243][ C1] ? check_preemption_disabled+0x44/0x260 [ 68.762942][ C1] ? debug_smp_processor_id+0x9/0x20 [ 68.768200][ C1] run_timer_softirq+0x4a/0x90 [ 68.772955][ C1] __do_softirq+0x283/0x7bd [ 68.777456][ C1] ? irq_exit+0x227/0x230 [ 68.781768][ C1] irq_exit+0x227/0x230 [ 68.786016][ C1] smp_apic_timer_interrupt+0x113/0x280 [ 68.791553][ C1] apic_timer_interrupt+0xf/0x20 [ 68.796461][ C1] [ 68.799380][ C1] RIP: 0010:kmem_cache_free+0xc8/0xf0 [ 68.804724][ C1] Code: 58 07 00 74 42 4c 89 f7 57 9d 0f 1f 44 00 00 e8 be d6 c9 ff eb 19 e8 57 d4 c9 ff 48 83 3d 47 43 58 07 00 74 24 4c 89 f7 57 9d <0f> 1f 44 00 00 4c 89 e7 4c 89 fe e8 68 01 00 00 5b 41 5c 41 5e 41 [ 68.824308][ C1] RSP: 0018:ffffc90004dd79a0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 68.832730][ C1] RAX: ffff88809faa0c94 RBX: ffff8880aa812a80 RCX: ffff88809faa0400 [ 68.840721][ C1] RDX: 0000000000000000 RSI: ffffffff81a45c14 RDI: 0000000000000282 [ 68.848691][ C1] RBP: ffffc90004dd79c0 R08: ffff88809faa0c58 R09: ffffc90004dd77c4 [ 68.856640][ C1] R10: 0000000000000012 R11: 0000000000000000 R12: ffffffff81a45c14 [ 68.864673][ C1] R13: dffffc0000000000 R14: 0000000000000282 R15: ffff88808ede90b0 [ 68.872627][ C1] ? ptlock_free+0x44/0x50 [ 68.877019][ C1] ? ptlock_free+0x44/0x50 [ 68.881429][ C1] ptlock_free+0x44/0x50 [ 68.885646][ C1] ___pmd_free_tlb+0xb2/0x120 [ 68.890294][ C1] free_pgd_range+0xaa5/0xe90 [ 68.894944][ C1] ? debug_smp_processor_id+0x9/0x20 [ 68.900206][ C1] free_pgtables+0x2c0/0x300 [ 68.904767][ C1] exit_mmap+0x290/0x540 [ 68.908985][ C1] __mmput+0x120/0x3a0 [ 68.913035][ C1] mmput+0x5d/0x70 [ 68.916735][ C1] exit_mm+0x4f4/0x580 [ 68.920786][ C1] do_exit+0x572/0x2000 [ 68.924921][ C1] ? __up_read+0x231/0x740 [ 68.929329][ C1] do_group_exit+0x15c/0x2b0 [ 68.933905][ C1] __do_sys_exit_group+0x17/0x20 [ 68.938814][ C1] __se_sys_exit_group+0x14/0x20 [ 68.943721][ C1] __x64_sys_exit_group+0x3b/0x40 [ 68.948717][ C1] do_syscall_64+0xf7/0x1c0 [ 68.953201][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 68.959164][ C1] RIP: 0033:0x440068 [ 68.963046][ C1] Code: Bad RIP value. [ 68.967086][ C1] RSP: 002b:00007fff0740e958 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 [ 68.975473][ C1] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440068 [ 68.983415][ C1] RDX: 0000000000000000 RSI: 000000000000003c RDI: 0000000000000000 [ 68.991361][ C1] RBP: 00000000004bf8f0 R08: 00000000000000e7 R09: ffffffffffffffd0 [ 68.999316][ C1] R10: 0000000000000004 R11: 0000000000000246 R12: 0000000000000001 [ 69.007272][ C1] R13: 00000000006d1180 R14: 0000000000000000 R15: 0000000000000000 [ 69.016685][ C1] Kernel Offset: disabled [ 69.021007][ C1] Rebooting in 86400 seconds..