[  OK  ] Reached target Login Prompts.
[  OK  ] Reached target Multi-User System.
[  OK  ] Reached target Graphical Interface.
         Starting Update UTMP about System Runlevel Changes...
[  OK  ] Started Update UTMP about System Runlevel Changes.


Debian GNU/Linux 9 syzkaller ttyS0

Warning: Permanently added '10.128.1.21' (ECDSA) to the list of known hosts.
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syzkaller login: [  527.129173][ T6953] ==================================================================
[  527.137677][ T6953] BUG: KASAN: use-after-free in kobject_put+0x220/0x270
[  527.144635][ T6953] Read of size 1 at addr ffff888098fe283c by task syz-executor476/6953
[  527.152879][ T6953] 
[  527.155228][ T6953] CPU: 0 PID: 6953 Comm: syz-executor476 Not tainted 5.9.0-rc2-next-20200828-syzkaller #0
[  527.165145][ T6953] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  527.175279][ T6953] Call Trace:
executing program
executing program
[  527.178594][ T6953]  dump_stack+0x18f/0x20d
[  527.182937][ T6953]  ? kobject_put+0x220/0x270
[  527.187543][ T6953]  ? kobject_put+0x220/0x270
[  527.192371][ T6953]  print_address_description.constprop.0.cold+0xae/0x497
[  527.199488][ T6953]  ? vprintk_func+0x97/0x1a6
[  527.204097][ T6953]  ? kobject_put+0x220/0x270
[  527.208745][ T6953]  ? kobject_put+0x220/0x270
[  527.213357][ T6953]  kasan_report.cold+0x1f/0x37
[  527.218111][ T6953]  ? kobject_put+0x220/0x270
[  527.222711][ T6953]  kobject_put+0x220/0x270
[  527.227186][ T6953]  delete_partition+0x134/0x220
[  527.232062][ T6953]  bdev_del_partition+0x18b/0x1d0
[  527.237169][ T6953]  blkpg_do_ioctl+0x2d6/0x330
[  527.241852][ T6953]  ? blkdev_pr_preempt+0x260/0x260
[  527.246988][ T6953]  blkdev_ioctl+0x58a/0x700
[  527.251501][ T6953]  ? blkdev_common_ioctl+0x1760/0x1760
[  527.257069][ T6953]  ? __fget_files+0x294/0x400
[  527.261773][ T6953]  block_ioctl+0xf9/0x140
[  527.266191][ T6953]  ? blkdev_fallocate+0x3f0/0x3f0
[  527.271266][ T6953]  __x64_sys_ioctl+0x193/0x200
[  527.276146][ T6953]  do_syscall_64+0x2d/0x70
[  527.280624][ T6953]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  527.286533][ T6953] RIP: 0033:0x446959
[  527.290415][ T6953] Code: e8 0c e8 ff ff 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 db 06 fc ff c3 66 2e 0f 1f 84 00 00 00 00
[  527.310055][ T6953] RSP: 002b:00007ff78aa55d98 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  527.318469][ T6953] RAX: ffffffffffffffda RBX: 00000000006dbc38 RCX: 0000000000446959
[  527.326430][ T6953] RDX: 0000000020000000 RSI: 0000000000001269 RDI: 0000000000000005
[  527.334394][ T6953] RBP: 00000000006dbc30 R08: 00007ff78aa56700 R09: 0000000000000000
[  527.342375][ T6953] R10: 00007ff78aa56700 R11: 0000000000000246 R12: 00000000006dbc3c
[  527.350347][ T6953] R13: 00000000000000a9 R14: 00b747111e42e3ec R15: 02ba2b7a04b8ac00
[  527.358313][ T6953] 
[  527.360697][ T6953] Allocated by task 6941:
[  527.365033][ T6953]  kasan_save_stack+0x1b/0x40
[  527.369758][ T6953]  __kasan_kmalloc.constprop.0+0xbf/0xd0
[  527.375405][ T6953]  kmem_cache_alloc_trace+0x16e/0x2c0
[  527.380802][ T6953]  kobject_create_and_add+0x42/0xb0
[  527.386019][ T6953]  add_partition+0x989/0xd80
[  527.390646][ T6953]  bdev_add_partition+0xb6/0x130
[  527.395579][ T6953]  blkpg_do_ioctl+0x2be/0x330
[  527.400370][ T6953]  blkdev_ioctl+0x58a/0x700
[  527.404920][ T6953]  block_ioctl+0xf9/0x140
[  527.409270][ T6953]  __x64_sys_ioctl+0x193/0x200
[  527.414043][ T6953]  do_syscall_64+0x2d/0x70
[  527.418452][ T6953]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  527.424320][ T6953] 
[  527.426645][ T6953] Freed by task 6952:
[  527.430615][ T6953]  kasan_save_stack+0x1b/0x40
[  527.435278][ T6953]  kasan_set_track+0x1c/0x30
[  527.439853][ T6953]  kasan_set_free_info+0x1b/0x30
[  527.444784][ T6953]  __kasan_slab_free+0xd8/0x120
[  527.449629][ T6953]  kfree+0x103/0x2c0
[  527.453508][ T6953]  kobject_put+0x171/0x270
[  527.457918][ T6953]  delete_partition+0x134/0x220
[  527.462769][ T6953]  bdev_del_partition+0x18b/0x1d0
[  527.467806][ T6953]  blkpg_do_ioctl+0x2d6/0x330
[  527.472480][ T6953]  blkdev_ioctl+0x58a/0x700
[  527.476971][ T6953]  block_ioctl+0xf9/0x140
[  527.481287][ T6953]  __x64_sys_ioctl+0x193/0x200
[  527.486035][ T6953]  do_syscall_64+0x2d/0x70
[  527.490449][ T6953]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  527.496323][ T6953] 
[  527.498651][ T6953] The buggy address belongs to the object at ffff888098fe2800
[  527.498651][ T6953]  which belongs to the cache kmalloc-64 of size 64
[  527.512535][ T6953] The buggy address is located 60 bytes inside of
[  527.512535][ T6953]  64-byte region [ffff888098fe2800, ffff888098fe2840)
[  527.525618][ T6953] The buggy address belongs to the page:
[  527.531262][ T6953] page:0000000054665c2f refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x98fe2
[  527.541419][ T6953] flags: 0xfffe0000000200(slab)
[  527.546271][ T6953] raw: 00fffe0000000200 ffffea0002a4af08 ffffea000298e688 ffff8880aa040200
[  527.554850][ T6953] raw: 0000000000000000 ffff888098fe2000 0000000100000020 0000000000000000
[  527.563432][ T6953] page dumped because: kasan: bad access detected
[  527.569848][ T6953] 
[  527.572163][ T6953] Memory state around the buggy address:
[  527.577872][ T6953]  ffff888098fe2700: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
[  527.585925][ T6953]  ffff888098fe2780: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
[  527.595368][ T6953] >ffff888098fe2800: fa fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc
[  527.603413][ T6953]                                         ^
[  527.609304][ T6953]  ffff888098fe2880: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
[  527.617384][ T6953]  ffff888098fe2900: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc
[  527.625449][ T6953] ==================================================================
[  527.633635][ T6953] Disabling lock debugging due to kernel taint
[  527.644028][ T6953] Kernel panic - not syncing: panic_on_warn set ...
[  527.650641][ T6953] CPU: 0 PID: 6953 Comm: syz-executor476 Tainted: G    B             5.9.0-rc2-next-20200828-syzkaller #0
[  527.661922][ T6953] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  527.672554][ T6953] Call Trace:
[  527.675864][ T6953]  dump_stack+0x18f/0x20d
[  527.680182][ T6953]  ? kobject_put+0x160/0x270
[  527.684831][ T6953]  panic+0x2e3/0x75c
[  527.688737][ T6953]  ? __warn_printk+0xf3/0xf3
[  527.693374][ T6953]  ? preempt_schedule_common+0x59/0xc0
[  527.698836][ T6953]  ? kobject_put+0x220/0x270
[  527.703487][ T6953]  ? preempt_schedule_thunk+0x16/0x18
[  527.708881][ T6953]  ? trace_hardirqs_on+0x55/0x220
[  527.713893][ T6953]  ? kobject_put+0x220/0x270
[  527.718474][ T6953]  ? kobject_put+0x220/0x270
[  527.723070][ T6953]  end_report+0x4d/0x53
[  527.727246][ T6953]  kasan_report.cold+0xd/0x37
[  527.731924][ T6953]  ? kobject_put+0x220/0x270
[  527.736507][ T6953]  kobject_put+0x220/0x270
[  527.741466][ T6953]  delete_partition+0x134/0x220
[  527.747112][ T6953]  bdev_del_partition+0x18b/0x1d0
[  527.752173][ T6953]  blkpg_do_ioctl+0x2d6/0x330
[  527.756840][ T6953]  ? blkdev_pr_preempt+0x260/0x260
[  527.761964][ T6953]  blkdev_ioctl+0x58a/0x700
[  527.766470][ T6953]  ? blkdev_common_ioctl+0x1760/0x1760
[  527.772984][ T6953]  ? __fget_files+0x294/0x400
[  527.777664][ T6953]  block_ioctl+0xf9/0x140
[  527.782003][ T6953]  ? blkdev_fallocate+0x3f0/0x3f0
[  527.787064][ T6953]  __x64_sys_ioctl+0x193/0x200
[  527.791840][ T6953]  do_syscall_64+0x2d/0x70
[  527.796254][ T6953]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  527.802175][ T6953] RIP: 0033:0x446959
[  527.806054][ T6953] Code: e8 0c e8 ff ff 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 db 06 fc ff c3 66 2e 0f 1f 84 00 00 00 00
[  527.825748][ T6953] RSP: 002b:00007ff78aa55d98 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  527.834157][ T6953] RAX: ffffffffffffffda RBX: 00000000006dbc38 RCX: 0000000000446959
[  527.842123][ T6953] RDX: 0000000020000000 RSI: 0000000000001269 RDI: 0000000000000005
[  527.850087][ T6953] RBP: 00000000006dbc30 R08: 00007ff78aa56700 R09: 0000000000000000
[  527.858049][ T6953] R10: 00007ff78aa56700 R11: 0000000000000246 R12: 00000000006dbc3c
[  527.866066][ T6953] R13: 00000000000000a9 R14: 00b747111e42e3ec R15: 02ba2b7a04b8ac00
[  527.875197][ T6953] Kernel Offset: disabled
[  527.879536][ T6953] Rebooting in 86400 seconds..