[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 51.677187][ T23] audit: type=1800 audit(1579416682.300:25): pid=8391 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 51.696212][ T23] audit: type=1800 audit(1579416682.300:26): pid=8391 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 51.755867][ T23] audit: type=1800 audit(1579416682.300:27): pid=8391 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 '10.128.1.38' (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 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executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 74.593428][ C1] ================================================================== [ 74.601778][ C1] BUG: KASAN: slab-out-of-bounds in bitmap_port_gc+0x140/0x4b0 [ 74.609305][ C1] Read of size 8 at addr ffff88809fb38540 by task swapper/1/0 [ 74.616775][ C1] [ 74.619095][ C1] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.5.0-rc6-syzkaller #0 [ 74.626978][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.637065][ C1] Call Trace: [ 74.640365][ C1] [ 74.643226][ C1] dump_stack+0x1fb/0x318 [ 74.647556][ C1] print_address_description+0x74/0x5c0 [ 74.653094][ C1] ? vprintk_default+0x28/0x30 [ 74.657849][ C1] ? vprintk_func+0x158/0x170 [ 74.662570][ C1] ? printk+0x62/0x8d [ 74.666535][ C1] __kasan_report+0x149/0x1c0 [ 74.671208][ C1] ? bitmap_port_gc+0x140/0x4b0 [ 74.676040][ C1] kasan_report+0x26/0x50 [ 74.680344][ C1] check_memory_region+0x2b6/0x2f0 [ 74.685442][ C1] __kasan_check_read+0x11/0x20 [ 74.690355][ C1] bitmap_port_gc+0x140/0x4b0 [ 74.695022][ C1] ? bitmap_port_create+0x790/0x790 [ 74.700196][ C1] call_timer_fn+0x95/0x170 [ 74.704685][ C1] ? bitmap_port_create+0x790/0x790 [ 74.709870][ C1] __run_timers+0x776/0x970 [ 74.714376][ C1] ? check_preemption_disabled+0x44/0x260 [ 74.720080][ C1] ? debug_smp_processor_id+0x9/0x20 [ 74.725452][ C1] run_timer_softirq+0x4a/0x90 [ 74.730202][ C1] __do_softirq+0x283/0x7bd [ 74.735412][ C1] ? irq_exit+0x227/0x230 [ 74.739781][ C1] irq_exit+0x227/0x230 [ 74.743923][ C1] smp_apic_timer_interrupt+0x113/0x280 [ 74.749456][ C1] apic_timer_interrupt+0xf/0x20 [ 74.754377][ C1] [ 74.757302][ C1] RIP: 0010:native_safe_halt+0x12/0x20 [ 74.762741][ C1] Code: 89 d9 80 e1 07 80 c1 03 38 c1 7c ba 48 89 df e8 a4 c5 b5 f9 eb b0 cc cc 55 48 89 e5 e9 07 00 00 00 0f 00 2d 42 a8 45 00 fb f4 <5d> c3 66 90 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 e9 07 00 00 [ 74.782334][ C1] RSP: 0018:ffffc90000d3fe08 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 74.790731][ C1] RAX: 1ffffffff1215228 RBX: ffff8880a9dfa340 RCX: dffffc0000000000 [ 74.798748][ C1] RDX: 0000000000000000 RSI: ffffffff812bf90a RDI: ffff8880a9dfab84 [ 74.806704][ C1] RBP: ffffc90000d3fe08 R08: ffff8880a9dfab98 R09: ffffed10153bf469 [ 74.814662][ C1] R10: ffffed10153bf469 R11: 0000000000000000 R12: 1ffff110153bf468 [ 74.822619][ C1] R13: dffffc0000000000 R14: dffffc0000000000 R15: 1ffffffff1215226 [ 74.830601][ C1] ? arch_cpu_idle+0xa/0x10 [ 74.835117][ C1] default_idle+0x50/0x70 [ 74.839446][ C1] arch_cpu_idle+0xa/0x10 [ 74.843766][ C1] default_idle_call+0x59/0xa0 [ 74.848581][ C1] do_idle+0x1ec/0x630 [ 74.852647][ C1] cpu_startup_entry+0x25/0x30 [ 74.857468][ C1] start_secondary+0x384/0x410 [ 74.862219][ C1] secondary_startup_64+0xa4/0xb0 [ 74.867223][ C1] [ 74.869562][ C1] Allocated by task 8542: [ 74.873891][ C1] __kasan_kmalloc+0x118/0x1c0 [ 74.878638][ C1] kasan_kmalloc+0x9/0x10 [ 74.882995][ C1] __kmalloc+0x254/0x340 [ 74.887212][ C1] kzalloc+0x21/0x40 [ 74.891220][ C1] ip_set_alloc+0x32/0x60 [ 74.895542][ C1] bitmap_port_create+0x32c/0x790 [ 74.900548][ C1] ip_set_create+0x421/0xfd0 [ 74.905124][ C1] nfnetlink_rcv_msg+0x9ae/0xcd0 [ 74.910094][ C1] netlink_rcv_skb+0x19e/0x3e0 [ 74.914836][ C1] nfnetlink_rcv+0x1e0/0x1e50 [ 74.919485][ C1] netlink_unicast+0x767/0x920 [ 74.924230][ C1] netlink_sendmsg+0xa2c/0xd50 [ 74.928974][ C1] ____sys_sendmsg+0x4f7/0x7f0 [ 74.934268][ C1] __sys_sendmsg+0x1ed/0x290 [ 74.938952][ C1] __x64_sys_sendmsg+0x7f/0x90 [ 74.943754][ C1] do_syscall_64+0xf7/0x1c0 [ 74.948238][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 74.954107][ C1] [ 74.956426][ C1] Freed by task 8219: [ 74.960423][ C1] __kasan_slab_free+0x12e/0x1e0 [ 74.965344][ C1] kasan_slab_free+0xe/0x10 [ 74.969845][ C1] kfree+0x10d/0x220 [ 74.973726][ C1] single_release+0x91/0xa0 [ 74.978209][ C1] __fput+0x2e4/0x740 [ 74.982240][ C1] ____fput+0x15/0x20 [ 74.986219][ C1] task_work_run+0x176/0x1b0 [ 74.990841][ C1] prepare_exit_to_usermode+0x480/0x5b0 [ 74.996368][ C1] syscall_return_slowpath+0x113/0x4a0 [ 75.001826][ C1] do_syscall_64+0x11f/0x1c0 [ 75.006393][ C1] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 75.012276][ C1] [ 75.014595][ C1] The buggy address belongs to the object at ffff88809fb38540 [ 75.014595][ C1] which belongs to the cache kmalloc-32 of size 32 [ 75.028503][ C1] The buggy address is located 0 bytes inside of [ 75.028503][ C1] 32-byte region [ffff88809fb38540, ffff88809fb38560) [ 75.041524][ C1] The buggy address belongs to the page: [ 75.047145][ C1] page:ffffea00027ece00 refcount:1 mapcount:0 mapping:ffff8880aa8001c0 index:0xffff88809fb38fc1 [ 75.057576][ C1] raw: 00fffe0000000200 ffffea00026839c8 ffffea0002790548 ffff8880aa8001c0 [ 75.066143][ C1] raw: ffff88809fb38fc1 ffff88809fb38000 000000010000003e 0000000000000000 [ 75.074827][ C1] page dumped because: kasan: bad access detected [ 75.081220][ C1] [ 75.083532][ C1] Memory state around the buggy address: [ 75.089146][ C1] ffff88809fb38400: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc [ 75.097192][ C1] ffff88809fb38480: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc [ 75.105283][ C1] >ffff88809fb38500: fb fb fb fb fc fc fc fc 04 fc fc fc fc fc fc fc [ 75.113338][ C1] ^ [ 75.119607][ C1] ffff88809fb38580: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc [ 75.127659][ C1] ffff88809fb38600: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc [ 75.136041][ C1] ================================================================== [ 75.144079][ C1] Disabling lock debugging due to kernel taint [ 75.150261][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 75.156835][ C1] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G B 5.5.0-rc6-syzkaller #0 [ 75.166155][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 75.176182][ C1] Call Trace: [ 75.179440][ C1] [ 75.182269][ C1] dump_stack+0x1fb/0x318 [ 75.186582][ C1] panic+0x264/0x7a9 [ 75.190451][ C1] ? __kasan_report+0x193/0x1c0 [ 75.195282][ C1] ? trace_hardirqs_on+0x34/0x80 [ 75.200196][ C1] ? _raw_spin_unlock_irqrestore+0xa8/0xe0 [ 75.205984][ C1] __kasan_report+0x1b9/0x1c0 [ 75.210648][ C1] ? bitmap_port_gc+0x140/0x4b0 [ 75.215480][ C1] kasan_report+0x26/0x50 [ 75.219790][ C1] check_memory_region+0x2b6/0x2f0 [ 75.224882][ C1] __kasan_check_read+0x11/0x20 [ 75.229717][ C1] bitmap_port_gc+0x140/0x4b0 [ 75.234379][ C1] ? bitmap_port_create+0x790/0x790 [ 75.239560][ C1] call_timer_fn+0x95/0x170 [ 75.244047][ C1] ? bitmap_port_create+0x790/0x790 [ 75.249280][ C1] __run_timers+0x776/0x970 [ 75.253897][ C1] ? check_preemption_disabled+0x44/0x260 [ 75.259597][ C1] ? debug_smp_processor_id+0x9/0x20 [ 75.264864][ C1] run_timer_softirq+0x4a/0x90 [ 75.269618][ C1] __do_softirq+0x283/0x7bd [ 75.274096][ C1] ? irq_exit+0x227/0x230 [ 75.278427][ C1] irq_exit+0x227/0x230 [ 75.282557][ C1] smp_apic_timer_interrupt+0x113/0x280 [ 75.288117][ C1] apic_timer_interrupt+0xf/0x20 [ 75.293066][ C1] [ 75.295999][ C1] RIP: 0010:native_safe_halt+0x12/0x20 [ 75.301481][ C1] Code: 89 d9 80 e1 07 80 c1 03 38 c1 7c ba 48 89 df e8 a4 c5 b5 f9 eb b0 cc cc 55 48 89 e5 e9 07 00 00 00 0f 00 2d 42 a8 45 00 fb f4 <5d> c3 66 90 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 e9 07 00 00 [ 75.321063][ C1] RSP: 0018:ffffc90000d3fe08 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 [ 75.329449][ C1] RAX: 1ffffffff1215228 RBX: ffff8880a9dfa340 RCX: dffffc0000000000 [ 75.337432][ C1] RDX: 0000000000000000 RSI: ffffffff812bf90a RDI: ffff8880a9dfab84 [ 75.345387][ C1] RBP: ffffc90000d3fe08 R08: ffff8880a9dfab98 R09: ffffed10153bf469 [ 75.353351][ C1] R10: ffffed10153bf469 R11: 0000000000000000 R12: 1ffff110153bf468 [ 75.361413][ C1] R13: dffffc0000000000 R14: dffffc0000000000 R15: 1ffffffff1215226 [ 75.369375][ C1] ? arch_cpu_idle+0xa/0x10 [ 75.373864][ C1] default_idle+0x50/0x70 [ 75.378239][ C1] arch_cpu_idle+0xa/0x10 [ 75.382599][ C1] default_idle_call+0x59/0xa0 [ 75.387345][ C1] do_idle+0x1ec/0x630 [ 75.391439][ C1] cpu_startup_entry+0x25/0x30 [ 75.396189][ C1] start_secondary+0x384/0x410 [ 75.400938][ C1] secondary_startup_64+0xa4/0xb0 [ 75.407417][ C1] Kernel Offset: disabled [ 75.411784][ C1] Rebooting in 86400 seconds..