[[0;32m OK [0m] Reached target Login Prompts.
[[0;32m OK [0m] Reached target Multi-User System.
[[0;32m OK [0m] Reached target Graphical Interface.
Starting Update UTMP about System Runlevel Changes...
[[0;32m OK [0m] Started Update UTMP about System Runlevel Changes.
Debian GNU/Linux 9 syzkaller ttyS0
Warning: Permanently added '10.128.0.222' (ECDSA) to the list of known hosts.
2021/12/03 12:02:01 fuzzer started
2021/12/03 12:02:01 connecting to host at 10.128.0.169:33213
2021/12/03 12:02:01 checking machine...
2021/12/03 12:02:01 checking revisions...
2021/12/03 12:02:01 testing simple program...
syzkaller login: [ 70.870156][ T6526] cgroup: Unknown subsys name 'net'
[ 70.876922][ T6526]
[ 70.879272][ T6526] =========================
[ 70.884283][ T6526] WARNING: held lock freed!
[ 70.888782][ T6526] 5.16.0-rc3-next-20211203-syzkaller #0 Not tainted
[ 70.895394][ T6526] -------------------------
[ 70.899886][ T6526] syz-executor/6526 is freeing memory ffff88801c8d5c00-ffff88801c8d5dff, with a lock still held there!
[ 70.911034][ T6526] ffff88801c8d5d48 (&root->kernfs_rwsem){++++}-{3:3}, at: kernfs_destroy_root+0x81/0xb0
[ 70.920796][ T6526] 2 locks held by syz-executor/6526:
[ 70.926065][ T6526] #0: ffffffff8bbc4e48 (cgroup_mutex){+.+.}-{3:3}, at: cgroup_lock_and_drain_offline+0xa5/0x900
[ 70.936686][ T6526] #1: ffff88801c8d5d48 (&root->kernfs_rwsem){++++}-{3:3}, at: kernfs_destroy_root+0x81/0xb0
[ 70.946854][ T6526]
[ 70.946854][ T6526] stack backtrace:
[ 70.952731][ T6526] CPU: 0 PID: 6526 Comm: syz-executor Not tainted 5.16.0-rc3-next-20211203-syzkaller #0
[ 70.962428][ T6526] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 70.972464][ T6526] Call Trace:
[ 70.975818][ T6526]
[ 70.978734][ T6526] dump_stack_lvl+0xcd/0x134
[ 70.983317][ T6526] debug_check_no_locks_freed.cold+0x9d/0xa9
[ 70.989290][ T6526] ? lockdep_hardirqs_on+0x79/0x100
[ 70.994579][ T6526] slab_free_freelist_hook+0x73/0x1c0
[ 70.999952][ T6526] ? kernfs_put.part.0+0x331/0x540
[ 71.005076][ T6526] kfree+0xd0/0x4b0
[ 71.008874][ T6526] ? kmem_cache_free+0xdd/0x580
[ 71.013715][ T6526] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70
[ 71.019961][ T6526] kernfs_put.part.0+0x331/0x540
[ 71.024970][ T6526] kernfs_put+0x42/0x50
[ 71.029114][ T6526] __kernfs_remove+0x7a3/0xb20
[ 71.033885][ T6526] ? kernfs_next_descendant_post+0x2f0/0x2f0
[ 71.039959][ T6526] ? down_write+0xde/0x150
[ 71.044482][ T6526] ? down_write_killable_nested+0x180/0x180
[ 71.050370][ T6526] kernfs_destroy_root+0x89/0xb0
[ 71.055310][ T6526] cgroup_setup_root+0x3a6/0xad0
[ 71.060344][ T6526] ? rebind_subsystems+0x10e0/0x10e0
[ 71.065644][ T6526] ? __sanitizer_cov_trace_const_cmp1+0x22/0x80
[ 71.071904][ T6526] cgroup1_get_tree+0xd33/0x1390
[ 71.076888][ T6526] vfs_get_tree+0x89/0x2f0
[ 71.081398][ T6526] path_mount+0x1320/0x1fa0
[ 71.085901][ T6526] ? kmem_cache_free+0xdd/0x580
[ 71.090772][ T6526] ? finish_automount+0xaf0/0xaf0
[ 71.095789][ T6526] ? putname+0xfe/0x140
[ 71.099946][ T6526] __x64_sys_mount+0x27f/0x300
[ 71.106191][ T6526] ? copy_mnt_ns+0xae0/0xae0
[ 71.110793][ T6526] ? syscall_enter_from_user_mode+0x21/0x70
[ 71.116677][ T6526] do_syscall_64+0x35/0xb0
[ 71.121076][ T6526] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 71.126952][ T6526] RIP: 0033:0x7ff07e4f804a
[ 71.131357][ T6526] Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
[ 71.151299][ T6526] RSP: 002b:00007ffc96a013a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
[ 71.159711][ T6526] RAX: ffffffffffffffda RBX: 00007ffc96a01538 RCX: 00007ff07e4f804a
[ 71.167688][ T6526] RDX: 00007ff07e55b012 RSI: 00007ff07e5512cc RDI: 00007ff07e54fd71
[ 71.175651][ T6526] RBP: 00007ff07e5512cc R08: 00007ff07e551429 R09: 0000000000000026
[ 71.183612][ T6526] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc96a013b0
[ 71.191571][ T6526] R13: 00007ffc96a01558 R14: 00007ffc96a01480 R15: 00007ff07e551423
[ 71.199566][ T6526]
[ 71.204285][ T6526] ==================================================================
[ 71.212348][ T6526] BUG: KASAN: use-after-free in up_write+0x3ac/0x470
[ 71.219040][ T6526] Read of size 8 at addr ffff88801c8d5d40 by task syz-executor/6526
[ 71.227010][ T6526]
[ 71.229316][ T6526] CPU: 0 PID: 6526 Comm: syz-executor Not tainted 5.16.0-rc3-next-20211203-syzkaller #0
[ 71.239124][ T6526] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 71.249163][ T6526] Call Trace:
[ 71.252427][ T6526]
[ 71.255344][ T6526] dump_stack_lvl+0xcd/0x134
[ 71.260017][ T6526] print_address_description.constprop.0.cold+0xa5/0x3ed
[ 71.267044][ T6526] ? up_write+0x3ac/0x470
[ 71.271360][ T6526] ? up_write+0x3ac/0x470
[ 71.275676][ T6526] kasan_report.cold+0x83/0xdf
[ 71.280439][ T6526] ? up_write+0x3ac/0x470
[ 71.284848][ T6526] up_write+0x3ac/0x470
[ 71.288993][ T6526] cgroup_setup_root+0x3a6/0xad0
[ 71.293935][ T6526] ? rebind_subsystems+0x10e0/0x10e0
[ 71.299306][ T6526] ? __sanitizer_cov_trace_const_cmp1+0x22/0x80
[ 71.305537][ T6526] cgroup1_get_tree+0xd33/0x1390
[ 71.310554][ T6526] vfs_get_tree+0x89/0x2f0
[ 71.314959][ T6526] path_mount+0x1320/0x1fa0
[ 71.319451][ T6526] ? kmem_cache_free+0xdd/0x580
[ 71.324292][ T6526] ? finish_automount+0xaf0/0xaf0
[ 71.329306][ T6526] ? putname+0xfe/0x140
[ 71.333463][ T6526] __x64_sys_mount+0x27f/0x300
[ 71.338220][ T6526] ? copy_mnt_ns+0xae0/0xae0
[ 71.342810][ T6526] ? syscall_enter_from_user_mode+0x21/0x70
[ 71.348698][ T6526] do_syscall_64+0x35/0xb0
[ 71.353113][ T6526] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 71.359001][ T6526] RIP: 0033:0x7ff07e4f804a
[ 71.363402][ T6526] Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
[ 71.382993][ T6526] RSP: 002b:00007ffc96a013a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
[ 71.391744][ T6526] RAX: ffffffffffffffda RBX: 00007ffc96a01538 RCX: 00007ff07e4f804a
[ 71.399715][ T6526] RDX: 00007ff07e55b012 RSI: 00007ff07e5512cc RDI: 00007ff07e54fd71
[ 71.407669][ T6526] RBP: 00007ff07e5512cc R08: 00007ff07e551429 R09: 0000000000000026
[ 71.415734][ T6526] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc96a013b0
[ 71.423693][ T6526] R13: 00007ffc96a01558 R14: 00007ffc96a01480 R15: 00007ff07e551423
[ 71.431656][ T6526]
[ 71.434657][ T6526]
[ 71.436961][ T6526] Allocated by task 6526:
[ 71.441268][ T6526] kasan_save_stack+0x1e/0x40
[ 71.445940][ T6526] __kasan_kmalloc+0xa9/0xd0
[ 71.450531][ T6526] kernfs_create_root+0x4c/0x410
[ 71.455458][ T6526] cgroup_setup_root+0x243/0xad0
[ 71.460382][ T6526] cgroup1_get_tree+0xd33/0x1390
[ 71.465304][ T6526] vfs_get_tree+0x89/0x2f0
[ 71.469710][ T6526] path_mount+0x1320/0x1fa0
[ 71.474209][ T6526] __x64_sys_mount+0x27f/0x300
[ 71.478974][ T6526] do_syscall_64+0x35/0xb0
[ 71.483379][ T6526] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 71.489344][ T6526]
[ 71.491657][ T6526] Freed by task 6526:
[ 71.495614][ T6526] kasan_save_stack+0x1e/0x40
[ 71.500278][ T6526] kasan_set_track+0x21/0x30
[ 71.504857][ T6526] kasan_set_free_info+0x20/0x30
[ 71.510212][ T6526] ____kasan_slab_free+0x166/0x1a0
[ 71.515311][ T6526] slab_free_freelist_hook+0x8b/0x1c0
[ 71.520759][ T6526] kfree+0xd0/0x4b0
[ 71.524552][ T6526] kernfs_put.part.0+0x331/0x540
[ 71.529492][ T6526] kernfs_put+0x42/0x50
[ 71.533637][ T6526] __kernfs_remove+0x7a3/0xb20
[ 71.538387][ T6526] kernfs_destroy_root+0x89/0xb0
[ 71.543310][ T6526] cgroup_setup_root+0x3a6/0xad0
[ 71.548234][ T6526] cgroup1_get_tree+0xd33/0x1390
[ 71.553158][ T6526] vfs_get_tree+0x89/0x2f0
[ 71.557560][ T6526] path_mount+0x1320/0x1fa0
[ 71.562088][ T6526] __x64_sys_mount+0x27f/0x300
[ 71.566842][ T6526] do_syscall_64+0x35/0xb0
[ 71.571246][ T6526] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 71.577130][ T6526]
[ 71.579453][ T6526] The buggy address belongs to the object at ffff88801c8d5c00
[ 71.579453][ T6526] which belongs to the cache kmalloc-512 of size 512
[ 71.593488][ T6526] The buggy address is located 320 bytes inside of
[ 71.593488][ T6526] 512-byte region [ffff88801c8d5c00, ffff88801c8d5e00)
[ 71.606756][ T6526] The buggy address belongs to the page:
[ 71.612364][ T6526] page:ffffea0000723500 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x1c8d4
[ 71.622495][ T6526] head:ffffea0000723500 order:2 compound_mapcount:0 compound_pincount:0
[ 71.631148][ T6526] flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
[ 71.639122][ T6526] raw: 00fff00000010200 dead000000000100 dead000000000122 ffff888010c41c80
[ 71.647689][ T6526] raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
[ 71.656248][ T6526] page dumped because: kasan: bad access detected
[ 71.662639][ T6526] page_owner tracks the page as allocated
[ 71.668421][ T6526] page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 8, ts 8568647134, free_ts 0
[ 71.686289][ T6526] get_page_from_freelist+0xa72/0x2f40
[ 71.691830][ T6526] __alloc_pages+0x1b2/0x500
[ 71.696427][ T6526] alloc_pages+0x1aa/0x310
[ 71.700842][ T6526] new_slab+0x28d/0x3a0
[ 71.704988][ T6526] ___slab_alloc+0x6be/0xd60
[ 71.709564][ T6526] __slab_alloc.constprop.0+0x4d/0xa0
[ 71.714924][ T6526] kmem_cache_alloc_node_trace+0x116/0x300
[ 71.720718][ T6526] blkg_alloc+0x88/0x670
[ 71.725053][ T6526] blkcg_init_queue+0x24/0x780
[ 71.729820][ T6526] blk_alloc_queue+0x44c/0x620
[ 71.734583][ T6526] blk_mq_init_queue+0x38/0xd0
[ 71.739336][ T6526] scsi_alloc_sdev+0x814/0xd60
[ 71.744102][ T6526] scsi_probe_and_add_lun+0x200b/0x3590
[ 71.749659][ T6526] __scsi_scan_target+0x21f/0xdb0
[ 71.754683][ T6526] scsi_scan_channel+0x148/0x1e0
[ 71.759612][ T6526] scsi_scan_host_selected+0x2df/0x3b0
[ 71.765065][ T6526] page_owner free stack trace missing
[ 71.770532][ T6526]
[ 71.772835][ T6526] Memory state around the buggy address:
[ 71.778714][ T6526] ffff88801c8d5c00: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 71.786758][ T6526] ffff88801c8d5c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 71.794983][ T6526] >ffff88801c8d5d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 71.803021][ T6526] ^
[ 71.809323][ T6526] ffff88801c8d5d80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 71.817365][ T6526] ffff88801c8d5e00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 71.825407][ T6526] ==================================================================
[ 71.835981][ T6526] Kernel panic - not syncing: panic_on_warn set ...
[ 71.842712][ T6526] CPU: 1 PID: 6526 Comm: syz-executor Tainted: G B 5.16.0-rc3-next-20211203-syzkaller #0
[ 71.853916][ T6526] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 71.864057][ T6526] Call Trace:
[ 71.867331][ T6526]
[ 71.870258][ T6526] dump_stack_lvl+0xcd/0x134
[ 71.874861][ T6526] panic+0x2b0/0x6dd
[ 71.878752][ T6526] ? __warn_printk+0xf3/0xf3
[ 71.883333][ T6526] ? preempt_schedule_common+0x59/0xc0
[ 71.888782][ T6526] ? up_write+0x3ac/0x470
[ 71.893159][ T6526] ? preempt_schedule_thunk+0x16/0x18
[ 71.898517][ T6526] ? trace_hardirqs_on+0x38/0x1c0
[ 71.903529][ T6526] ? trace_hardirqs_on+0x51/0x1c0
[ 71.908547][ T6526] ? up_write+0x3ac/0x470
[ 71.912878][ T6526] ? up_write+0x3ac/0x470
[ 71.917194][ T6526] end_report.cold+0x63/0x6f
[ 71.921772][ T6526] kasan_report.cold+0x71/0xdf
[ 71.926526][ T6526] ? up_write+0x3ac/0x470
[ 71.930855][ T6526] up_write+0x3ac/0x470
[ 71.934996][ T6526] cgroup_setup_root+0x3a6/0xad0
[ 71.939934][ T6526] ? rebind_subsystems+0x10e0/0x10e0
[ 71.945241][ T6526] ? __sanitizer_cov_trace_const_cmp1+0x22/0x80
[ 71.951499][ T6526] cgroup1_get_tree+0xd33/0x1390
[ 71.956548][ T6526] vfs_get_tree+0x89/0x2f0
[ 71.960967][ T6526] path_mount+0x1320/0x1fa0
[ 71.965475][ T6526] ? kmem_cache_free+0xdd/0x580
[ 71.970329][ T6526] ? finish_automount+0xaf0/0xaf0
[ 71.975346][ T6526] ? putname+0xfe/0x140
[ 71.980194][ T6526] __x64_sys_mount+0x27f/0x300
[ 71.986526][ T6526] ? copy_mnt_ns+0xae0/0xae0
[ 71.991121][ T6526] ? syscall_enter_from_user_mode+0x21/0x70
[ 71.997101][ T6526] do_syscall_64+0x35/0xb0
[ 72.001507][ T6526] entry_SYSCALL_64_after_hwframe+0x44/0xae
[ 72.007389][ T6526] RIP: 0033:0x7ff07e4f804a
[ 72.011878][ T6526] Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48
[ 72.031470][ T6526] RSP: 002b:00007ffc96a013a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
[ 72.039868][ T6526] RAX: ffffffffffffffda RBX: 00007ffc96a01538 RCX: 00007ff07e4f804a
[ 72.047836][ T6526] RDX: 00007ff07e55b012 RSI: 00007ff07e5512cc RDI: 00007ff07e54fd71
[ 72.055879][ T6526] RBP: 00007ff07e5512cc R08: 00007ff07e551429 R09: 0000000000000026
[ 72.063843][ T6526] R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc96a013b0
[ 72.071812][ T6526] R13: 00007ffc96a01558 R14: 00007ffc96a01480 R15: 00007ff07e551423
[ 72.079789][ T6526]
[ 72.083064][ T6526] Kernel Offset: disabled
[ 72.087446][ T6526] Rebooting in 86400 seconds..