Warning: Permanently added '10.128.0.27' (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 syzkaller login: [ 41.830321][ T2788] ================================================================== [ 41.838564][ T2788] BUG: KASAN: use-after-free in l2cap_chan_close+0x46/0xae0 [ 41.845848][ T2788] Read of size 8 at addr ffff8880a6b7d000 by task kworker/0:4/2788 [ 41.853752][ T2788] [ 41.856131][ T2788] CPU: 0 PID: 2788 Comm: kworker/0:4 Not tainted 5.7.0-rc1-syzkaller #0 [ 41.864461][ T2788] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.874528][ T2788] Workqueue: events do_enable_set executing program executing program executing program executing program [ 41.879567][ T2788] Call Trace: [ 41.882855][ T2788] dump_stack+0x1e9/0x30e [ 41.887186][ T2788] print_address_description+0x74/0x5c0 [ 41.892731][ T2788] ? printk+0x62/0x83 [ 41.896713][ T2788] ? vprintk_emit+0x339/0x3c0 [ 41.901401][ T2788] __kasan_report+0x103/0x1a0 [ 41.906082][ T2788] ? l2cap_chan_close+0x46/0xae0 [ 41.911024][ T2788] ? l2cap_chan_close+0x46/0xae0 [ 41.915960][ T2788] kasan_report+0x4d/0x80 [ 41.920462][ T2788] ? lock_acquire+0x169/0x480 [ 41.925140][ T2788] ? l2cap_chan_close+0x46/0xae0 executing program executing program executing program [ 41.930089][ T2788] ? do_enable_set+0x62e/0x8d0 [ 41.934858][ T2788] ? rcu_read_lock_sched_held+0x106/0x170 [ 41.940575][ T2788] ? process_one_work+0x76e/0xfd0 [ 41.945639][ T2788] ? worker_thread+0xa7f/0x1450 [ 41.950510][ T2788] ? kthread+0x353/0x380 [ 41.954758][ T2788] ? rcu_lock_release+0x20/0x20 [ 41.959605][ T2788] ? kthread_blkcg+0xd0/0xd0 [ 41.964237][ T2788] ? ret_from_fork+0x24/0x30 [ 41.968841][ T2788] [ 41.971167][ T2788] Allocated by task 2788: [ 41.975492][ T2788] __kasan_kmalloc+0x114/0x160 [ 41.980258][ T2788] kmem_cache_alloc_trace+0x234/0x300 [ 41.985631][ T2788] l2cap_chan_create+0x4c/0x320 [ 41.990481][ T2788] do_enable_set+0x673/0x8d0 [ 41.995072][ T2788] process_one_work+0x76e/0xfd0 [ 41.999923][ T2788] worker_thread+0xa7f/0x1450 [ 42.004610][ T2788] kthread+0x353/0x380 [ 42.008679][ T2788] ret_from_fork+0x24/0x30 [ 42.013087][ T2788] [ 42.015413][ T2788] Freed by task 23: [ 42.019216][ T2788] __kasan_slab_free+0x125/0x190 [ 42.024147][ T2788] kfree+0x10a/0x220 [ 42.028041][ T2788] do_enable_set+0x63a/0x8d0 [ 42.032626][ T2788] process_one_work+0x76e/0xfd0 [ 42.037995][ T2788] worker_thread+0xa7f/0x1450 [ 42.042672][ T2788] kthread+0x353/0x380 [ 42.046745][ T2788] ret_from_fork+0x24/0x30 [ 42.051152][ T2788] [ 42.053481][ T2788] The buggy address belongs to the object at ffff8880a6b7d000 [ 42.053481][ T2788] which belongs to the cache kmalloc-2k of size 2048 [ 42.067987][ T2788] The buggy address is located 0 bytes inside of [ 42.067987][ T2788] 2048-byte region [ffff8880a6b7d000, ffff8880a6b7d800) [ 42.082187][ T2788] The buggy address belongs to the page: [ 42.087824][ T2788] page:ffffea00029adf40 refcount:1 mapcount:0 mapping:000000003958a0e7 index:0x0 [ 42.097020][ T2788] flags: 0xfffe0000000200(slab) [ 42.101883][ T2788] raw: 00fffe0000000200 ffffea00029adf08 ffffea00029adf88 ffff8880aa400e00 [ 42.110503][ T2788] raw: 0000000000000000 ffff8880a6b7d000 0000000100000001 0000000000000000 [ 42.120042][ T2788] page dumped because: kasan: bad access detected [ 42.126452][ T2788] [ 42.128780][ T2788] Memory state around the buggy address: [ 42.135294][ T2788] ffff8880a6b7cf00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 42.143370][ T2788] ffff8880a6b7cf80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 42.152286][ T2788] >ffff8880a6b7d000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 42.160346][ T2788] ^ [ 42.164520][ T2788] ffff8880a6b7d080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 42.172585][ T2788] ffff8880a6b7d100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 42.180658][ T2788] ================================================================== [ 42.188721][ T2788] Disabling lock debugging due to kernel taint executing program executing program executing program [ 42.224470][ T2788] Kernel panic - not syncing: panic_on_warn set ... [ 42.231095][ T2788] CPU: 0 PID: 2788 Comm: kworker/0:4 Tainted: G B 5.7.0-rc1-syzkaller #0 [ 42.240800][ T2788] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.250856][ T2788] Workqueue: events do_enable_set [ 42.255872][ T2788] Call Trace: [ 42.259158][ T2788] dump_stack+0x1e9/0x30e [ 42.263485][ T2788] panic+0x264/0x7a0 [ 42.267382][ T2788] ? trace_hardirqs_on+0x30/0x70 executing program executing program executing program executing program [ 42.272310][ T2788] __kasan_report+0x191/0x1a0 [ 42.277012][ T2788] ? l2cap_chan_close+0x46/0xae0 [ 42.281946][ T2788] ? l2cap_chan_close+0x46/0xae0 [ 42.286882][ T2788] kasan_report+0x4d/0x80 [ 42.291207][ T2788] ? lock_acquire+0x169/0x480 [ 42.295890][ T2788] ? l2cap_chan_close+0x46/0xae0 [ 42.300923][ T2788] ? do_enable_set+0x62e/0x8d0 [ 42.305696][ T2788] ? rcu_read_lock_sched_held+0x106/0x170 [ 42.311409][ T2788] ? process_one_work+0x76e/0xfd0 [ 42.316434][ T2788] ? worker_thread+0xa7f/0x1450 executing program [ 42.321287][ T2788] ? kthread+0x353/0x380 [ 42.325623][ T2788] ? rcu_lock_release+0x20/0x20 [ 42.330471][ T2788] ? kthread_blkcg+0xd0/0xd0 [ 42.335053][ T2788] ? ret_from_fork+0x24/0x30 [ 42.341007][ T2788] Kernel Offset: disabled [ 42.345343][ T2788] Rebooting in 86400 seconds..