Warning: Permanently added '10.128.0.127' (ECDSA) to the list of known hosts. syzkaller login: [ 42.534571][ T6817] IPVS: ftp: loaded support on port[0] = 21 [ 42.534783][ T6814] IPVS: ftp: loaded support on port[0] = 21 [ 42.543156][ T6819] IPVS: ftp: loaded support on port[0] = 21 [ 42.554844][ T6816] IPVS: ftp: loaded support on port[0] = 21 [ 42.569091][ T6818] IPVS: ftp: loaded support on port[0] = 21 [ 42.577577][ T6812] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 42.962108][ T2547] ================================================================== [ 42.970406][ T2547] BUG: KASAN: use-after-free in l2cap_chan_close+0x46/0xae0 [ 42.977689][ T2547] Read of size 8 at addr ffff88809768a000 by task kworker/0:2/2547 [ 42.985567][ T2547] [ 42.987899][ T2547] CPU: 0 PID: 2547 Comm: kworker/0:2 Not tainted 5.8.0-syzkaller #0 [ 42.995865][ T2547] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.005922][ T2547] Workqueue: events do_enable_set executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 43.010939][ T2547] Call Trace: [ 43.014227][ T2547] dump_stack+0x1f0/0x31e [ 43.018568][ T2547] print_address_description+0x66/0x5a0 [ 43.024111][ T2547] ? vprintk_emit+0x342/0x3c0 [ 43.028799][ T2547] ? printk+0x62/0x83 [ 43.032780][ T2547] ? vprintk_emit+0x339/0x3c0 [ 43.037458][ T2547] kasan_report+0x132/0x1d0 [ 43.041962][ T2547] ? l2cap_chan_close+0x46/0xae0 [ 43.046896][ T2547] ? lock_acquire+0x160/0x730 [ 43.051570][ T2547] l2cap_chan_close+0x46/0xae0 [ 43.056337][ T2547] do_enable_set+0x662/0x900 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 43.060931][ T2547] ? lock_is_held_type+0xb3/0xe0 [ 43.065871][ T2547] process_one_work+0x789/0xfc0 [ 43.070738][ T2547] worker_thread+0xaa4/0x1460 [ 43.075456][ T2547] ? _raw_spin_unlock_irqrestore+0x6f/0xd0 [ 43.081268][ T2547] kthread+0x37e/0x3a0 [ 43.085332][ T2547] ? rcu_lock_release+0x20/0x20 [ 43.090176][ T2547] ? kthread_blkcg+0xd0/0xd0 [ 43.094769][ T2547] ret_from_fork+0x1f/0x30 [ 43.099182][ T2547] [ 43.101507][ T2547] Allocated by task 23: [ 43.105656][ T2547] __kasan_kmalloc+0x103/0x140 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 43.110411][ T2547] kmem_cache_alloc_trace+0x234/0x300 [ 43.115780][ T2547] l2cap_chan_create+0x4c/0x320 [ 43.120623][ T2547] do_enable_set+0x6a7/0x900 [ 43.125207][ T2547] process_one_work+0x789/0xfc0 [ 43.130057][ T2547] worker_thread+0xaa4/0x1460 [ 43.134726][ T2547] kthread+0x37e/0x3a0 [ 43.138798][ T2547] ret_from_fork+0x1f/0x30 [ 43.143198][ T2547] [ 43.145522][ T2547] Freed by task 23: [ 43.149326][ T2547] __kasan_slab_free+0x114/0x170 [ 43.154250][ T2547] kfree+0x10a/0x220 [ 43.158140][ T2547] do_enable_set+0x66e/0x900 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 43.162727][ T2547] process_one_work+0x789/0xfc0 [ 43.167580][ T2547] worker_thread+0xaa4/0x1460 [ 43.172245][ T2547] kthread+0x37e/0x3a0 [ 43.176305][ T2547] ret_from_fork+0x1f/0x30 [ 43.180703][ T2547] [ 43.183032][ T2547] The buggy address belongs to the object at ffff88809768a000 [ 43.183032][ T2547] which belongs to the cache kmalloc-2k of size 2048 [ 43.197073][ T2547] The buggy address is located 0 bytes inside of [ 43.197073][ T2547] 2048-byte region [ffff88809768a000, ffff88809768a800) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 43.210247][ T2547] The buggy address belongs to the page: [ 43.215886][ T2547] page:ffffea00025da280 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 [ 43.225081][ T2547] flags: 0xfffe0000000200(slab) [ 43.229932][ T2547] raw: 00fffe0000000200 ffffea00029e4648 ffffea00025c11c8 ffff8880aa400e00 [ 43.238516][ T2547] raw: 0000000000000000 ffff88809768a000 0000000100000001 0000000000000000 [ 43.247091][ T2547] page dumped because: kasan: bad access detected [ 43.253491][ T2547] [ 43.255810][ T2547] Memory state around the buggy address: executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 43.261432][ T2547] ffff888097689f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 43.269486][ T2547] ffff888097689f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 43.277538][ T2547] >ffff88809768a000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 43.285585][ T2547] ^ [ 43.289645][ T2547] ffff88809768a080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 43.297697][ T2547] ffff88809768a100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 43.305749][ T2547] ================================================================== executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 43.313798][ T2547] Disabling lock debugging due to kernel taint executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 43.396404][ T2547] Kernel panic - not syncing: panic_on_warn set ... [ 43.403032][ T2547] CPU: 0 PID: 2547 Comm: kworker/0:2 Tainted: G B 5.8.0-syzkaller #0 [ 43.412383][ T2547] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.422444][ T2547] Workqueue: events do_enable_set [ 43.427453][ T2547] Call Trace: [ 43.430917][ T2547] dump_stack+0x1f0/0x31e [ 43.435236][ T2547] panic+0x264/0x7a0 [ 43.439133][ T2547] ? trace_hardirqs_on+0x30/0x80 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 43.444185][ T2547] kasan_report+0x1c9/0x1d0 [ 43.448679][ T2547] ? l2cap_chan_close+0x46/0xae0 [ 43.453614][ T2547] ? lock_acquire+0x160/0x730 [ 43.458287][ T2547] l2cap_chan_close+0x46/0xae0 [ 43.463170][ T2547] do_enable_set+0x662/0x900 [ 43.467753][ T2547] ? lock_is_held_type+0xb3/0xe0 [ 43.472684][ T2547] process_one_work+0x789/0xfc0 [ 43.477545][ T2547] worker_thread+0xaa4/0x1460 [ 43.482218][ T2547] ? _raw_spin_unlock_irqrestore+0x6f/0xd0 [ 43.488021][ T2547] kthread+0x37e/0x3a0 [ 43.492083][ T2547] ? rcu_lock_release+0x20/0x20 executing program executing program executing program [ 43.496924][ T2547] ? kthread_blkcg+0xd0/0xd0 [ 43.501505][ T2547] ret_from_fork+0x1f/0x30 [ 43.507163][ T2547] Kernel Offset: disabled [ 43.511518][ T2547] Rebooting in 86400 seconds..