Warning: Permanently added '10.128.0.56' (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 syzkaller login: [ 94.680436][ T9509] ================================================================== [ 94.689048][ T9509] BUG: KASAN: use-after-free in get_work_pool+0x19/0x1a0 [ 94.689065][ T9509] Read of size 8 at addr ffff888094619008 by task syz-executor702/9509 [ 94.689068][ T9509] [ 94.689083][ T9509] CPU: 1 PID: 9509 Comm: syz-executor702 Not tainted 5.6.0-rc4-syzkaller #0 [ 94.689090][ T9509] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 94.689095][ T9509] Call Trace: [ 94.689112][ T9509] dump_stack+0x188/0x20d [ 94.689125][ T9509] ? get_work_pool+0x19/0x1a0 [ 94.689138][ T9509] ? get_work_pool+0x19/0x1a0 [ 94.689156][ T9509] print_address_description.constprop.0.cold+0xd3/0x315 [ 94.689167][ T9509] ? get_work_pool+0x19/0x1a0 [ 94.689180][ T9509] ? get_work_pool+0x19/0x1a0 [ 94.689193][ T9509] __kasan_report.cold+0x1a/0x32 [ 94.689210][ T9509] ? get_work_pool+0x19/0x1a0 [ 94.689227][ T9509] kasan_report+0xe/0x20 [ 94.689242][ T9509] check_memory_region+0x128/0x190 [ 94.689256][ T9509] get_work_pool+0x19/0x1a0 [ 94.689271][ T9509] __flush_work+0x15f/0xa70 [ 94.689292][ T9509] ? queue_delayed_work_on+0x210/0x210 [ 94.795327][ T9509] ? try_to_grab_pending+0x26c/0x8e0 [ 94.800654][ T9509] ? mark_lock+0xbc/0x1220 [ 94.805087][ T9509] ? rcu_read_lock_held+0x9c/0xb0 [ 94.810396][ T9509] ? mark_lock+0xbc/0x1220 [ 94.814831][ T9509] ? mark_held_locks+0x9f/0xe0 [ 94.819615][ T9509] ? mark_held_locks+0x9f/0xe0 [ 94.824392][ T9509] __cancel_work_timer+0x3a2/0x500 [ 94.829504][ T9509] ? mod_delayed_work_on+0x1f0/0x1f0 [ 94.834908][ T9509] ? console_unlock+0x7a6/0xf00 [ 94.839817][ T9509] ? lockdep_hardirqs_on+0x417/0x5d0 [ 94.845359][ T9509] ? console_unlock+0x7eb/0xf00 [ 94.850197][ T9509] ? con_shutdown+0x3d/0x90 [ 94.854692][ T9509] release_tty+0x253/0x450 [ 94.859444][ T9509] tty_release_struct+0x37/0x50 [ 94.864282][ T9509] tty_release+0xbc7/0xe90 [ 94.868714][ T9509] ? do_tty_hangup+0x30/0x30 [ 94.873285][ T9509] __fput+0x2da/0x850 [ 94.877259][ T9509] task_work_run+0x13f/0x1b0 [ 94.881836][ T9509] do_exit+0xb59/0x2db0 [ 94.886007][ T9509] ? mm_update_next_owner+0x7a0/0x7a0 [ 94.891724][ T9509] ? up_read+0x1ab/0x750 [ 94.895948][ T9509] ? mark_held_locks+0x9f/0xe0 [ 94.900708][ T9509] ? down_read_non_owner+0x470/0x470 [ 94.906160][ T9509] do_group_exit+0x125/0x340 [ 94.910788][ T9509] __ia32_sys_exit_group+0x3a/0x50 [ 94.916062][ T9509] do_fast_syscall_32+0x270/0xe8f [ 94.921172][ T9509] entry_SYSENTER_compat+0x70/0x7f [ 94.926296][ T9509] [ 94.928612][ T9509] Allocated by task 9509: [ 94.932931][ T9509] save_stack+0x1b/0x80 [ 94.937084][ T9509] __kasan_kmalloc.constprop.0+0xbf/0xd0 [ 94.942710][ T9509] kmem_cache_alloc_trace+0x153/0x7d0 [ 94.948080][ T9509] vc_allocate+0x1e2/0x6e0 [ 94.952478][ T9509] con_install+0x4f/0x400 [ 94.956808][ T9509] tty_init_dev+0xf5/0x460 [ 94.961204][ T9509] tty_open+0x47f/0xb30 [ 94.965347][ T9509] chrdev_open+0x219/0x5c0 [ 94.969766][ T9509] do_dentry_open+0x4a2/0x1250 [ 94.974529][ T9509] path_openat+0x122a/0x32b0 [ 94.979101][ T9509] do_filp_open+0x192/0x260 [ 94.983629][ T9509] do_sys_openat2+0x54c/0x740 [ 94.988407][ T9509] do_sys_open+0xc3/0x140 [ 94.992758][ T9509] do_fast_syscall_32+0x270/0xe8f [ 94.998562][ T9509] entry_SYSENTER_compat+0x70/0x7f [ 95.003651][ T9509] [ 95.006035][ T9509] Freed by task 9514: [ 95.010026][ T9509] save_stack+0x1b/0x80 [ 95.014178][ T9509] __kasan_slab_free+0xf7/0x140 [ 95.019015][ T9509] kfree+0x109/0x2b0 [ 95.022918][ T9509] vt_disallocate_all+0x293/0x3b0 [ 95.027933][ T9509] vt_ioctl+0xb79/0x2470 [ 95.032197][ T9509] vt_compat_ioctl+0x410/0x710 [ 95.036962][ T9509] tty_compat_ioctl+0x19c/0x410 [ 95.041814][ T9509] __ia32_compat_sys_ioctl+0x23d/0x2b0 [ 95.047448][ T9509] do_fast_syscall_32+0x270/0xe8f [ 95.052565][ T9509] entry_SYSENTER_compat+0x70/0x7f [ 95.057711][ T9509] [ 95.060072][ T9509] The buggy address belongs to the object at ffff888094619000 [ 95.060072][ T9509] which belongs to the cache kmalloc-2k of size 2048 [ 95.074156][ T9509] The buggy address is located 8 bytes inside of [ 95.074156][ T9509] 2048-byte region [ffff888094619000, ffff888094619800) [ 95.087369][ T9509] The buggy address belongs to the page: [ 95.093038][ T9509] page:ffffea0002518640 refcount:1 mapcount:0 mapping:ffff8880aa000e00 index:0x0 [ 95.102152][ T9509] flags: 0xfffe0000000200(slab) [ 95.106997][ T9509] raw: 00fffe0000000200 ffffea0002807948 ffffea000288d648 ffff8880aa000e00 [ 95.115565][ T9509] raw: 0000000000000000 ffff888094619000 0000000100000001 0000000000000000 [ 95.124126][ T9509] page dumped because: kasan: bad access detected [ 95.130513][ T9509] [ 95.132839][ T9509] Memory state around the buggy address: [ 95.138450][ T9509] ffff888094618f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 95.146499][ T9509] ffff888094618f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 95.154549][ T9509] >ffff888094619000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 95.162590][ T9509] ^ [ 95.166952][ T9509] ffff888094619080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 95.175002][ T9509] ffff888094619100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 95.183043][ T9509] ================================================================== [ 95.191132][ T9509] Disabling lock debugging due to kernel taint [ 95.197931][ T9509] Kernel panic - not syncing: panic_on_warn set ... [ 95.204515][ T9509] CPU: 1 PID: 9509 Comm: syz-executor702 Tainted: G B 5.6.0-rc4-syzkaller #0 [ 95.214555][ T9509] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 95.224597][ T9509] Call Trace: [ 95.227898][ T9509] dump_stack+0x188/0x20d [ 95.232317][ T9509] panic+0x2e3/0x75c [ 95.236309][ T9509] ? add_taint.cold+0x16/0x16 [ 95.240979][ T9509] ? preempt_schedule_common+0x5e/0xc0 [ 95.246426][ T9509] ? get_work_pool+0x19/0x1a0 [ 95.251088][ T9509] ? ___preempt_schedule+0x16/0x18 [ 95.265232][ T9509] ? trace_hardirqs_on+0x55/0x220 [ 95.270242][ T9509] ? get_work_pool+0x19/0x1a0 [ 95.274916][ T9509] end_report+0x43/0x49 [ 95.279052][ T9509] ? get_work_pool+0x19/0x1a0 [ 95.283711][ T9509] __kasan_report.cold+0xd/0x32 [ 95.288562][ T9509] ? get_work_pool+0x19/0x1a0 [ 95.293241][ T9509] kasan_report+0xe/0x20 [ 95.297471][ T9509] check_memory_region+0x128/0x190 [ 95.302584][ T9509] get_work_pool+0x19/0x1a0 [ 95.307775][ T9509] __flush_work+0x15f/0xa70 [ 95.313836][ T9509] ? queue_delayed_work_on+0x210/0x210 [ 95.319287][ T9509] ? try_to_grab_pending+0x26c/0x8e0 [ 95.324552][ T9509] ? mark_lock+0xbc/0x1220 [ 95.328956][ T9509] ? rcu_read_lock_held+0x9c/0xb0 [ 95.333957][ T9509] ? mark_lock+0xbc/0x1220 [ 95.338362][ T9509] ? mark_held_locks+0x9f/0xe0 [ 95.343117][ T9509] ? mark_held_locks+0x9f/0xe0 [ 95.347862][ T9509] __cancel_work_timer+0x3a2/0x500 [ 95.352964][ T9509] ? mod_delayed_work_on+0x1f0/0x1f0 [ 95.358448][ T9509] ? console_unlock+0x7a6/0xf00 [ 95.363293][ T9509] ? lockdep_hardirqs_on+0x417/0x5d0 [ 95.368573][ T9509] ? console_unlock+0x7eb/0xf00 [ 95.373405][ T9509] ? con_shutdown+0x3d/0x90 [ 95.377910][ T9509] release_tty+0x253/0x450 [ 95.382310][ T9509] tty_release_struct+0x37/0x50 [ 95.387145][ T9509] tty_release+0xbc7/0xe90 [ 95.391565][ T9509] ? do_tty_hangup+0x30/0x30 [ 95.396141][ T9509] __fput+0x2da/0x850 [ 95.400107][ T9509] task_work_run+0x13f/0x1b0 [ 95.404691][ T9509] do_exit+0xb59/0x2db0 [ 95.408846][ T9509] ? mm_update_next_owner+0x7a0/0x7a0 [ 95.414201][ T9509] ? up_read+0x1ab/0x750 [ 95.418420][ T9509] ? mark_held_locks+0x9f/0xe0 [ 95.423163][ T9509] ? down_read_non_owner+0x470/0x470 [ 95.428443][ T9509] do_group_exit+0x125/0x340 [ 95.433015][ T9509] __ia32_sys_exit_group+0x3a/0x50 [ 95.438106][ T9509] do_fast_syscall_32+0x270/0xe8f [ 95.443120][ T9509] entry_SYSENTER_compat+0x70/0x7f [ 95.449604][ T9509] Kernel Offset: disabled [ 95.453940][ T9509] Rebooting in 86400 seconds..