Warning: Permanently added '10.128.1.30' (ECDSA) to the list of known hosts. syzkaller login: [ 89.967516][ T9893] IPVS: ftp: loaded support on port[0] = 21 [ 89.967523][ T9891] IPVS: ftp: loaded support on port[0] = 21 [ 89.976652][ T9887] IPVS: ftp: loaded support on port[0] = 21 [ 89.982562][ T9894] IPVS: ftp: loaded support on port[0] = 21 [ 89.988321][ T9895] IPVS: ftp: loaded support on port[0] = 21 [ 89.994307][ T9892] 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 executing program executing program executing program executing program executing program executing program executing program [ 90.482065][ T2888] ================================================================== [ 90.490855][ T2888] BUG: KASAN: use-after-free in refcount_warn_saturate+0x1f/0x1f0 [ 90.499104][ T2888] Write of size 4 at addr ffff888090eb4018 by task kworker/1:24/2888 [ 90.508121][ T2888] [ 90.510470][ T2888] CPU: 1 PID: 2888 Comm: kworker/1:24 Not tainted 5.6.0-rc3-syzkaller #0 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 90.520212][ T2888] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 90.533079][ T2888] Workqueue: events do_enable_set [ 90.539950][ T2888] Call Trace: [ 90.543270][ T2888] dump_stack+0x197/0x210 [ 90.548064][ T2888] ? refcount_warn_saturate+0x1f/0x1f0 [ 90.553559][ T2888] print_address_description.constprop.0.cold+0xd4/0x30b [ 90.560703][ T2888] ? refcount_warn_saturate+0x1f/0x1f0 [ 90.566195][ T2888] ? refcount_warn_saturate+0x1f/0x1f0 [ 90.571724][ T2888] __kasan_report.cold+0x1b/0x32 [ 90.576699][ T2888] ? refcount_warn_saturate+0x1f/0x1f0 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 90.582196][ T2888] kasan_report+0x12/0x20 [ 90.586646][ T2888] check_memory_region+0x134/0x1a0 [ 90.591787][ T2888] __kasan_check_write+0x14/0x20 [ 90.596760][ T2888] refcount_warn_saturate+0x1f/0x1f0 [ 90.602275][ T2888] l2cap_chan_put+0x1d9/0x240 [ 90.607014][ T2888] do_enable_set+0x54b/0x960 [ 90.611645][ T2888] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 90.617830][ T2888] ? lowpan_control_write+0x4b0/0x4b0 [ 90.623235][ T2888] ? rcu_read_lock_sched_held+0x9c/0xd0 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 90.628815][ T2888] ? rcu_read_lock_any_held.part.0+0x50/0x50 [ 90.634825][ T2888] ? trace_hardirqs_on+0x67/0x240 [ 90.640610][ T2888] process_one_work+0xa05/0x17a0 [ 90.647617][ T2888] ? mark_held_locks+0xf0/0xf0 [ 90.652576][ T2888] ? pwq_dec_nr_in_flight+0x320/0x320 [ 90.658096][ T2888] ? lock_acquire+0x190/0x410 [ 90.662840][ T2888] worker_thread+0x98/0xe40 [ 90.667393][ T2888] kthread+0x361/0x430 [ 90.671603][ T2888] ? process_one_work+0x17a0/0x17a0 [ 90.676821][ T2888] ? kthread_mod_delayed_work+0x1f0/0x1f0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 90.682588][ T2888] ret_from_fork+0x24/0x30 [ 90.687298][ T2888] [ 90.689657][ T2888] Allocated by task 2888: [ 90.694024][ T2888] save_stack+0x23/0x90 [ 90.698317][ T2888] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 90.703972][ T2888] kasan_kmalloc+0x9/0x10 [ 90.708447][ T2888] kmem_cache_alloc_trace+0x158/0x790 [ 90.713843][ T2888] l2cap_chan_create+0x45/0x3a0 [ 90.718760][ T2888] chan_create+0x10/0xe0 [ 90.723019][ T2888] do_enable_set+0x583/0x960 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 90.727631][ T2888] process_one_work+0xa05/0x17a0 [ 90.733553][ T2888] worker_thread+0x98/0xe40 [ 90.738070][ T2888] kthread+0x361/0x430 [ 90.742150][ T2888] ret_from_fork+0x24/0x30 [ 90.746568][ T2888] [ 90.748904][ T2888] Freed by task 2975: [ 90.752900][ T2888] save_stack+0x23/0x90 [ 90.757075][ T2888] __kasan_slab_free+0x102/0x150 [ 90.762029][ T2888] kasan_slab_free+0xe/0x10 [ 90.766549][ T2888] kfree+0x10a/0x2c0 [ 90.770463][ T2888] l2cap_chan_put+0x1b7/0x240 [ 90.775496][ T2888] do_enable_set+0x54b/0x960 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 90.780127][ T2888] process_one_work+0xa05/0x17a0 [ 90.786127][ T2888] worker_thread+0x98/0xe40 [ 90.791095][ T2888] kthread+0x361/0x430 [ 90.795357][ T2888] ret_from_fork+0x24/0x30 [ 90.799777][ T2888] [ 90.802112][ T2888] The buggy address belongs to the object at ffff888090eb4000 [ 90.802112][ T2888] which belongs to the cache kmalloc-2k of size 2048 [ 90.816179][ T2888] The buggy address is located 24 bytes inside of [ 90.816179][ T2888] 2048-byte region [ffff888090eb4000, ffff888090eb4800) executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 90.829460][ T2888] The buggy address belongs to the page: [ 90.835113][ T2888] page:ffffea000243ad00 refcount:1 mapcount:0 mapping:ffff8880aa400e00 index:0x0 [ 90.844320][ T2888] flags: 0xfffe0000000200(slab) [ 90.849188][ T2888] raw: 00fffe0000000200 ffffea0002694048 ffffea000241e648 ffff8880aa400e00 [ 90.857818][ T2888] raw: 0000000000000000 ffff888090eb4000 0000000100000001 0000000000000000 [ 90.866420][ T2888] page dumped because: kasan: bad access detected [ 90.872927][ T2888] [ 90.875259][ T2888] 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 [ 90.881857][ T2888] ffff888090eb3f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 90.889937][ T2888] ffff888090eb3f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 90.898019][ T2888] >ffff888090eb4000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 90.906088][ T2888] ^ [ 90.910979][ T2888] ffff888090eb4080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 90.919056][ T2888] ffff888090eb4100: 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 90.927136][ T2888] ================================================================== [ 90.935232][ T2888] 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 91.722783][ T2888] Kernel panic - not syncing: panic_on_warn set ... [ 91.729479][ T2888] CPU: 1 PID: 2888 Comm: kworker/1:24 Tainted: G B 5.6.0-rc3-syzkaller #0 [ 91.739459][ T2888] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 91.749535][ T2888] Workqueue: events do_enable_set [ 91.754656][ T2888] Call Trace: [ 91.758067][ T2888] dump_stack+0x197/0x210 [ 91.762428][ T2888] panic+0x2e3/0x75c [ 91.766351][ T2888] ? add_taint.cold+0x16/0x16 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 91.771059][ T2888] ? refcount_warn_saturate+0x1f/0x1f0 [ 91.776542][ T2888] ? preempt_schedule+0x4b/0x60 [ 91.781416][ T2888] ? ___preempt_schedule+0x16/0x18 [ 91.786550][ T2888] ? trace_hardirqs_on+0x5e/0x240 [ 91.791592][ T2888] ? refcount_warn_saturate+0x1f/0x1f0 [ 91.797072][ T2888] end_report+0x47/0x4f [ 91.801245][ T2888] ? refcount_warn_saturate+0x1f/0x1f0 [ 91.806724][ T2888] __kasan_report.cold+0xe/0x32 [ 91.811811][ T2888] ? refcount_warn_saturate+0x1f/0x1f0 [ 91.817300][ T2888] kasan_report+0x12/0x20 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 91.821661][ T2888] check_memory_region+0x134/0x1a0 [ 91.826794][ T2888] __kasan_check_write+0x14/0x20 [ 91.831859][ T2888] refcount_warn_saturate+0x1f/0x1f0 [ 91.837178][ T2888] l2cap_chan_put+0x1d9/0x240 [ 91.841893][ T2888] do_enable_set+0x54b/0x960 [ 91.846530][ T2888] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 91.852729][ T2888] ? lowpan_control_write+0x4b0/0x4b0 [ 91.858124][ T2888] ? rcu_read_lock_sched_held+0x9c/0xd0 [ 91.865688][ T2888] ? rcu_read_lock_any_held.part.0+0x50/0x50 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 91.871691][ T2888] ? trace_hardirqs_on+0x67/0x240 [ 91.876772][ T2888] process_one_work+0xa05/0x17a0 [ 91.881751][ T2888] ? mark_held_locks+0xf0/0xf0 [ 91.886546][ T2888] ? pwq_dec_nr_in_flight+0x320/0x320 [ 91.891931][ T2888] ? lock_acquire+0x190/0x410 [ 91.896669][ T2888] worker_thread+0x98/0xe40 [ 91.901217][ T2888] kthread+0x361/0x430 [ 91.905304][ T2888] ? process_one_work+0x17a0/0x17a0 [ 91.910517][ T2888] ? kthread_mod_delayed_work+0x1f0/0x1f0 [ 91.916291][ T2888] ret_from_fork+0x24/0x30 [ 91.921835][ T2888] Kernel Offset: disabled [ 91.926175][ T2888] Rebooting in 86400 seconds..