Warning: Permanently added '10.128.0.172' (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 [ 45.342266][ T2721] ================================================================== [ 45.350492][ T2721] BUG: KASAN: use-after-free in l2cap_chan_close+0x46/0xae0 [ 45.357777][ T2721] Read of size 8 at addr ffff88808ec44000 by task kworker/0:4/2721 [ 45.365666][ T2721] [ 45.368004][ T2721] CPU: 0 PID: 2721 Comm: kworker/0:4 Not tainted 5.7.0-rc6-syzkaller #0 [ 45.376318][ T2721] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.386382][ T2721] Workqueue: events do_enable_set executing program executing program executing program executing program [ 45.391408][ T2721] Call Trace: [ 45.394714][ T2721] dump_stack+0x1e9/0x30e [ 45.399040][ T2721] print_address_description+0x74/0x5c0 [ 45.404581][ T2721] ? printk+0x62/0x83 [ 45.408569][ T2721] ? vprintk_emit+0x339/0x3c0 [ 45.413249][ T2721] __kasan_report+0x103/0x1a0 [ 45.417927][ T2721] ? l2cap_chan_close+0x46/0xae0 [ 45.422904][ T2721] ? l2cap_chan_close+0x46/0xae0 [ 45.427846][ T2721] kasan_report+0x4d/0x80 [ 45.432175][ T2721] ? l2cap_chan_close+0x46/0xae0 [ 45.437116][ T2721] ? do_enable_set+0x62e/0x8d0 [ 45.441887][ T2721] ? process_one_work+0x76e/0xfd0 [ 45.446933][ T2721] ? worker_thread+0xa7f/0x1450 [ 45.451829][ T2721] ? kthread+0x353/0x380 [ 45.456060][ T2721] ? rcu_lock_release+0x20/0x20 [ 45.460884][ T2721] ? kthread_blkcg+0xd0/0xd0 [ 45.465461][ T2721] ? ret_from_fork+0x24/0x30 [ 45.470041][ T2721] [ 45.472359][ T2721] Allocated by task 2721: [ 45.476672][ T2721] __kasan_kmalloc+0x114/0x160 [ 45.481407][ T2721] kmem_cache_alloc_trace+0x234/0x300 [ 45.486775][ T2721] l2cap_chan_create+0x4c/0x320 [ 45.491598][ T2721] do_enable_set+0x673/0x8d0 [ 45.496160][ T2721] process_one_work+0x76e/0xfd0 [ 45.500989][ T2721] worker_thread+0xa7f/0x1450 [ 45.505732][ T2721] kthread+0x353/0x380 [ 45.509793][ T2721] ret_from_fork+0x24/0x30 [ 45.514176][ T2721] [ 45.516476][ T2721] Freed by task 3031: [ 45.520430][ T2721] __kasan_slab_free+0x125/0x190 [ 45.525360][ T2721] kfree+0x10a/0x220 [ 45.529233][ T2721] do_enable_set+0x63a/0x8d0 [ 45.533889][ T2721] process_one_work+0x76e/0xfd0 [ 45.538729][ T2721] worker_thread+0xa7f/0x1450 [ 45.543380][ T2721] kthread+0x353/0x380 [ 45.547428][ T2721] ret_from_fork+0x24/0x30 [ 45.551815][ T2721] [ 45.554119][ T2721] The buggy address belongs to the object at ffff88808ec44000 [ 45.554119][ T2721] which belongs to the cache kmalloc-2k of size 2048 [ 45.568141][ T2721] The buggy address is located 0 bytes inside of [ 45.568141][ T2721] 2048-byte region [ffff88808ec44000, ffff88808ec44800) [ 45.581292][ T2721] The buggy address belongs to the page: [ 45.586916][ T2721] page:ffffea00023b1100 refcount:1 mapcount:0 mapping:000000007d6d3db6 index:0x0 [ 45.595991][ T2721] flags: 0xfffe0000000200(slab) [ 45.600825][ T2721] raw: 00fffe0000000200 ffffea0002a2e448 ffffea00024ef448 ffff8880aa400e00 [ 45.609380][ T2721] raw: 0000000000000000 ffff88808ec44000 0000000100000001 0000000000000000 [ 45.617933][ T2721] page dumped because: kasan: bad access detected [ 45.624319][ T2721] [ 45.626636][ T2721] Memory state around the buggy address: [ 45.632257][ T2721] ffff88808ec43f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 45.640418][ T2721] ffff88808ec43f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 45.648451][ T2721] >ffff88808ec44000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 45.656483][ T2721] ^ [ 45.660535][ T2721] ffff88808ec44080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 45.668574][ T2721] ffff88808ec44100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 45.676617][ T2721] ================================================================== [ 45.684648][ T2721] Disabling lock debugging due to kernel taint executing program executing program executing program executing program executing program [ 45.695736][ T2721] Kernel panic - not syncing: panic_on_warn set ... [ 45.702349][ T2721] CPU: 0 PID: 2721 Comm: kworker/0:4 Tainted: G B 5.7.0-rc6-syzkaller #0 [ 45.712044][ T2721] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.722101][ T2721] Workqueue: events do_enable_set [ 45.727113][ T2721] Call Trace: [ 45.730391][ T2721] dump_stack+0x1e9/0x30e [ 45.734709][ T2721] panic+0x264/0x7a0 [ 45.738594][ T2721] ? trace_hardirqs_on+0x30/0x70 executing program executing program executing program executing program [ 45.743523][ T2721] __kasan_report+0x191/0x1a0 [ 45.748187][ T2721] ? l2cap_chan_close+0x46/0xae0 [ 45.753158][ T2721] ? l2cap_chan_close+0x46/0xae0 [ 45.758081][ T2721] kasan_report+0x4d/0x80 [ 45.762494][ T2721] ? l2cap_chan_close+0x46/0xae0 [ 45.767422][ T2721] ? do_enable_set+0x62e/0x8d0 [ 45.772179][ T2721] ? process_one_work+0x76e/0xfd0 [ 45.777759][ T2721] ? worker_thread+0xa7f/0x1450 [ 45.782606][ T2721] ? kthread+0x353/0x380 [ 45.786838][ T2721] ? rcu_lock_release+0x20/0x20 [ 45.791680][ T2721] ? kthread_blkcg+0xd0/0xd0 [ 45.796259][ T2721] ? ret_from_fork+0x24/0x30 [ 45.802341][ T2721] Kernel Offset: disabled [ 45.806715][ T2721] Rebooting in 86400 seconds..