[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?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[1G[[32m ok [39;49m8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
Debian GNU/Linux 7 syzkaller ttyS0
Warning: Permanently added '10.128.0.95' (ECDSA) to the list of known hosts.
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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..