Warning: Permanently added '10.128.1.14' (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 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 syzkaller login: [ 119.774005][ T2840] ================================================================== [ 119.782352][ T2840] BUG: KASAN: use-after-free in l2cap_chan_close+0x661/0xa10 [ 119.789747][ T2840] Read of size 1 at addr ffff8880a8e35020 by task kworker/1:104/2840 [ 119.797842][ T2840] [ 119.800184][ T2840] CPU: 1 PID: 2840 Comm: kworker/1:104 Not tainted 5.6.0-rc3-syzkaller #0 [ 119.808688][ T2840] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 119.818768][ T2840] Workqueue: events do_enable_set [ 119.823804][ T2840] Call Trace: [ 119.827117][ T2840] dump_stack+0x197/0x210 [ 119.831474][ T2840] ? l2cap_chan_close+0x661/0xa10 [ 119.836551][ T2840] print_address_description.constprop.0.cold+0xd4/0x30b [ 119.843595][ T2840] ? l2cap_chan_close+0x661/0xa10 [ 119.848652][ T2840] ? l2cap_chan_close+0x661/0xa10 [ 119.853701][ T2840] __kasan_report.cold+0x1b/0x32 [ 119.858667][ T2840] ? l2cap_chan_close+0x661/0xa10 [ 119.863715][ T2840] kasan_report+0x12/0x20 [ 119.868074][ T2840] __asan_report_load1_noabort+0x14/0x20 [ 119.873725][ T2840] l2cap_chan_close+0x661/0xa10 [ 119.878618][ T2840] ? __kasan_check_read+0x11/0x20 [ 119.883658][ T2840] ? l2cap_send_i_or_rr_or_rnr+0x330/0x330 [ 119.889558][ T2840] do_enable_set+0x53f/0x960 [ 119.894187][ T2840] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 119.900369][ T2840] ? lowpan_control_write+0x4b0/0x4b0 [ 119.905768][ T2840] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 119.911338][ T2840] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 119.917368][ T2840] ? trace_hardirqs_on+0x67/0x240 [ 119.922421][ T2840] process_one_work+0xa05/0x17a0 [ 119.927392][ T2840] ? mark_held_locks+0xf0/0xf0 [ 119.932193][ T2840] ? pwq_dec_nr_in_flight+0x320/0x320 [ 119.937668][ T2840] ? lock_acquire+0x190/0x410 [ 119.942382][ T2840] worker_thread+0x98/0xe40 [ 119.946932][ T2840] kthread+0x361/0x430 [ 119.951018][ T2840] ? process_one_work+0x17a0/0x17a0 [ 119.956269][ T2840] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 119.962063][ T2840] ret_from_fork+0x24/0x30 [ 119.966506][ T2840] [ 119.968846][ T2840] Allocated by task 2840: [ 119.973191][ T2840] save_stack+0x23/0x90 [ 119.977397][ T2840] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 119.986209][ T2840] kasan_kmalloc+0x9/0x10 [ 119.990561][ T2840] kmem_cache_alloc_trace+0x158/0x790 [ 119.995949][ T2840] l2cap_chan_create+0x45/0x3a0 [ 120.000812][ T2840] chan_create+0x10/0xe0 [ 120.005106][ T2840] do_enable_set+0x583/0x960 [ 120.009737][ T2840] process_one_work+0xa05/0x17a0 [ 120.014696][ T2840] worker_thread+0x98/0xe40 [ 120.019217][ T2840] kthread+0x361/0x430 [ 120.024299][ T2840] ret_from_fork+0x24/0x30 [ 120.028723][ T2840] [ 120.031056][ T2840] Freed by task 2690: [ 120.035065][ T2840] save_stack+0x23/0x90 [ 120.039234][ T2840] __kasan_slab_free+0x102/0x150 [ 120.044190][ T2840] kasan_slab_free+0xe/0x10 [ 120.048705][ T2840] kfree+0x10a/0x2c0 [ 120.052618][ T2840] l2cap_chan_put+0x1b7/0x240 [ 120.057373][ T2840] do_enable_set+0x54b/0x960 [ 120.062018][ T2840] process_one_work+0xa05/0x17a0 [ 120.066979][ T2840] worker_thread+0x98/0xe40 [ 120.071509][ T2840] kthread+0x361/0x430 [ 120.075596][ T2840] ret_from_fork+0x24/0x30 [ 120.080029][ T2840] [ 120.082377][ T2840] The buggy address belongs to the object at ffff8880a8e35000 [ 120.082377][ T2840] which belongs to the cache kmalloc-2k of size 2048 [ 120.096448][ T2840] The buggy address is located 32 bytes inside of [ 120.096448][ T2840] 2048-byte region [ffff8880a8e35000, ffff8880a8e35800) [ 120.109736][ T2840] The buggy address belongs to the page: [ 120.115384][ T2840] page:ffffea0002a38d40 refcount:1 mapcount:0 mapping:ffff8880aa400e00 index:0x0 [ 120.124502][ T2840] flags: 0xfffe0000000200(slab) [ 120.129375][ T2840] raw: 00fffe0000000200 ffffea0002807ec8 ffffea0002a0b448 ffff8880aa400e00 [ 120.137980][ T2840] raw: 0000000000000000 ffff8880a8e35000 0000000100000001 0000000000000000 [ 120.146611][ T2840] page dumped because: kasan: bad access detected [ 120.153033][ T2840] [ 120.155406][ T2840] Memory state around the buggy address: [ 120.161057][ T2840] ffff8880a8e34f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 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 [ 120.169146][ T2840] ffff8880a8e34f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 120.177253][ T2840] >ffff8880a8e35000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 120.185338][ T2840] ^ [ 120.190467][ T2840] ffff8880a8e35080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 120.198549][ T2840] ffff8880a8e35100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 120.206621][ T2840] ================================================================== [ 120.214698][ T2840] 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 [ 120.233491][ T2840] Kernel panic - not syncing: panic_on_warn set ... [ 120.240137][ T2840] CPU: 1 PID: 2840 Comm: kworker/1:104 Tainted: G B 5.6.0-rc3-syzkaller #0 [ 120.250028][ T2840] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 120.260106][ T2840] Workqueue: events do_enable_set [ 120.265167][ T2840] Call Trace: [ 120.268483][ T2840] dump_stack+0x197/0x210 [ 120.272834][ T2840] panic+0x2e3/0x75c [ 120.276746][ T2840] ? add_taint.cold+0x16/0x16 executing program executing program executing program executing program executing program [ 120.281445][ T2840] ? l2cap_chan_close+0x661/0xa10 [ 120.290831][ T2840] ? preempt_schedule+0x4b/0x60 [ 120.295701][ T2840] ? ___preempt_schedule+0x16/0x18 [ 120.300840][ T2840] ? trace_hardirqs_on+0x5e/0x240 [ 120.305886][ T2840] ? l2cap_chan_close+0x661/0xa10 [ 120.310931][ T2840] end_report+0x47/0x4f [ 120.315103][ T2840] ? l2cap_chan_close+0x661/0xa10 [ 120.320142][ T2840] __kasan_report.cold+0xe/0x32 [ 120.325010][ T2840] ? l2cap_chan_close+0x661/0xa10 [ 120.330055][ T2840] kasan_report+0x12/0x20 [ 120.334401][ T2840] __asan_report_load1_noabort+0x14/0x20 [ 120.340055][ T2840] l2cap_chan_close+0x661/0xa10 [ 120.344923][ T2840] ? __kasan_check_read+0x11/0x20 [ 120.349968][ T2840] ? l2cap_send_i_or_rr_or_rnr+0x330/0x330 [ 120.355802][ T2840] do_enable_set+0x53f/0x960 [ 120.360416][ T2840] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 120.366586][ T2840] ? lowpan_control_write+0x4b0/0x4b0 [ 120.371978][ T2840] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 120.377557][ T2840] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 120.383562][ T2840] ? trace_hardirqs_on+0x67/0x240 [ 120.388606][ T2840] process_one_work+0xa05/0x17a0 [ 120.393561][ T2840] ? mark_held_locks+0xf0/0xf0 [ 120.398343][ T2840] ? pwq_dec_nr_in_flight+0x320/0x320 [ 120.403721][ T2840] ? lock_acquire+0x190/0x410 [ 120.408409][ T2840] worker_thread+0x98/0xe40 [ 120.412934][ T2840] kthread+0x361/0x430 [ 120.417012][ T2840] ? process_one_work+0x17a0/0x17a0 [ 120.422222][ T2840] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 120.427957][ T2840] ret_from_fork+0x24/0x30 [ 120.433323][ T2840] Kernel Offset: disabled [ 120.437689][ T2840] Rebooting in 86400 seconds..