Warning: Permanently added '10.128.10.50' (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 syzkaller login: [ 70.354780][ T9064] ================================================================== [ 70.363052][ T9064] BUG: KASAN: use-after-free in try_to_grab_pending+0x115/0x910 [ 70.370687][ T9064] Write of size 8 at addr ffff888091419008 by task syz-executor658/9064 [ 70.379019][ T9064] [ 70.381358][ T9064] CPU: 1 PID: 9064 Comm: syz-executor658 Not tainted 5.4.0-syzkaller #0 [ 70.389681][ T9064] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 70.399743][ T9064] Call Trace: [ 70.403040][ T9064] dump_stack+0x197/0x210 [ 70.407638][ T9064] ? try_to_grab_pending+0x115/0x910 [ 70.412939][ T9064] print_address_description.constprop.0.cold+0xd4/0x30b [ 70.419968][ T9064] ? try_to_grab_pending+0x115/0x910 [ 70.425258][ T9064] ? try_to_grab_pending+0x115/0x910 [ 70.430555][ T9064] __kasan_report.cold+0x1b/0x41 [ 70.435501][ T9064] ? try_to_grab_pending+0x115/0x910 [ 70.440789][ T9064] kasan_report+0x12/0x20 [ 70.445124][ T9064] check_memory_region+0x134/0x1a0 [ 70.450241][ T9064] __kasan_check_write+0x14/0x20 [ 70.455185][ T9064] try_to_grab_pending+0x115/0x910 [ 70.460301][ T9064] ? __kasan_check_read+0x11/0x20 [ 70.465340][ T9064] __cancel_work_timer+0xc4/0x540 [ 70.470378][ T9064] ? mod_delayed_work_on+0x200/0x200 [ 70.475673][ T9064] ? console_unlock+0x7dc/0xf00 [ 70.480531][ T9064] ? get_work_pool+0x1b0/0x1b0 [ 70.485311][ T9064] cancel_work_sync+0x18/0x20 [ 70.489996][ T9064] tty_buffer_cancel_work+0x16/0x20 [ 70.495199][ T9064] release_tty+0x261/0x470 [ 70.499625][ T9064] tty_release_struct+0x3c/0x50 [ 70.504484][ T9064] tty_release+0xbcb/0xe90 [ 70.508930][ T9064] __fput+0x2ff/0x890 [ 70.512923][ T9064] ? do_tty_hangup+0x30/0x30 [ 70.517524][ T9064] ____fput+0x16/0x20 [ 70.521519][ T9064] task_work_run+0x145/0x1c0 [ 70.526238][ T9064] do_exit+0x8e7/0x2ef0 [ 70.530425][ T9064] ? mm_update_next_owner+0x7c0/0x7c0 [ 70.535817][ T9064] ? down_read_non_owner+0x490/0x490 [ 70.541122][ T9064] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 70.547384][ T9064] ? handle_mm_fault+0x4ab/0xa50 executing program [ 70.552342][ T9064] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 70.557820][ T9064] do_group_exit+0x135/0x360 [ 70.562440][ T9064] __ia32_sys_exit_group+0x44/0x50 [ 70.567572][ T9064] do_fast_syscall_32+0x27b/0xe16 [ 70.572612][ T9064] entry_SYSENTER_compat+0x70/0x7f [ 70.577753][ T9064] RIP: 0023:0xf7f14a39 [ 70.581830][ T9064] Code: Bad RIP value. [ 70.585897][ T9064] RSP: 002b:00000000ffed556c EFLAGS: 00000296 ORIG_RAX: 00000000000000fc [ 70.594412][ T9064] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000080ed298 [ 70.602390][ T9064] RDX: 0000000000000000 RSI: 00000000080d6fdc RDI: 00000000080ed2a0 [ 70.610476][ T9064] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 70.618430][ T9064] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 70.626386][ T9064] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 70.634885][ T9064] [ 70.637196][ T9064] Allocated by task 9064: [ 70.641512][ T9064] save_stack+0x23/0x90 [ 70.645702][ T9064] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 70.651330][ T9064] kasan_kmalloc+0x9/0x10 [ 70.655656][ T9064] kmem_cache_alloc_trace+0x158/0x790 [ 70.661014][ T9064] vc_allocate+0x1fc/0x760 [ 70.665470][ T9064] con_install+0x52/0x410 [ 70.669815][ T9064] tty_init_dev+0xf9/0x470 [ 70.674217][ T9064] tty_open+0x4a5/0xbb0 [ 70.678370][ T9064] chrdev_open+0x245/0x6b0 [ 70.682784][ T9064] do_dentry_open+0x4e6/0x1380 [ 70.687539][ T9064] vfs_open+0xa0/0xd0 [ 70.691505][ T9064] path_openat+0x10df/0x4500 [ 70.696075][ T9064] do_filp_open+0x1a1/0x280 [ 70.700585][ T9064] do_sys_open+0x3fe/0x5d0 [ 70.704980][ T9064] __ia32_compat_sys_open+0x79/0xb0 [ 70.710172][ T9064] do_fast_syscall_32+0x27b/0xe16 [ 70.715179][ T9064] entry_SYSENTER_compat+0x70/0x7f [ 70.720274][ T9064] [ 70.722596][ T9064] Freed by task 9080: [ 70.726579][ T9064] save_stack+0x23/0x90 [ 70.730729][ T9064] __kasan_slab_free+0x102/0x150 [ 70.735660][ T9064] kasan_slab_free+0xe/0x10 [ 70.740139][ T9064] kfree+0x10a/0x2c0 [ 70.744041][ T9064] vt_disallocate_all+0x2bd/0x3e0 [ 70.749053][ T9064] vt_ioctl+0xc38/0x26d0 [ 70.753295][ T9064] vt_compat_ioctl+0x457/0x7a0 [ 70.758057][ T9064] tty_compat_ioctl+0x1b0/0x420 [ 70.762894][ T9064] __ia32_compat_sys_ioctl+0x233/0x610 [ 70.768341][ T9064] do_fast_syscall_32+0x27b/0xe16 [ 70.773349][ T9064] entry_SYSENTER_compat+0x70/0x7f [ 70.778434][ T9064] [ 70.780759][ T9064] The buggy address belongs to the object at ffff888091419000 [ 70.780759][ T9064] which belongs to the cache kmalloc-2k of size 2048 [ 70.794805][ T9064] The buggy address is located 8 bytes inside of [ 70.794805][ T9064] 2048-byte region [ffff888091419000, ffff888091419800) [ 70.807969][ T9064] The buggy address belongs to the page: [ 70.813596][ T9064] page:ffffea0002450640 refcount:1 mapcount:0 mapping:ffff8880aa400e00 index:0x0 [ 70.822696][ T9064] raw: 00fffe0000000200 ffffea00023b4448 ffffea00029c4c08 ffff8880aa400e00 [ 70.831271][ T9064] raw: 0000000000000000 ffff888091419000 0000000100000001 0000000000000000 [ 70.839846][ T9064] page dumped because: kasan: bad access detected [ 70.846240][ T9064] [ 70.848560][ T9064] Memory state around the buggy address: [ 70.854197][ T9064] ffff888091418f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 70.862244][ T9064] ffff888091418f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 70.870288][ T9064] >ffff888091419000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 70.878335][ T9064] ^ [ 70.882668][ T9064] ffff888091419080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 70.890722][ T9064] ffff888091419100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 70.898757][ T9064] ================================================================== [ 70.906802][ T9064] Disabling lock debugging due to kernel taint [ 70.912968][ T9064] Kernel panic - not syncing: panic_on_warn set ... [ 70.919567][ T9064] CPU: 1 PID: 9064 Comm: syz-executor658 Tainted: G B 5.4.0-syzkaller #0 [ 70.929262][ T9064] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 70.939302][ T9064] Call Trace: [ 70.942581][ T9064] dump_stack+0x197/0x210 [ 70.946895][ T9064] panic+0x2e3/0x75c [ 70.950779][ T9064] ? add_taint.cold+0x16/0x16 [ 70.955444][ T9064] ? try_to_grab_pending+0x115/0x910 [ 70.960796][ T9064] ? trace_hardirqs_off+0x62/0x240 [ 70.966526][ T9064] ? trace_hardirqs_off+0x59/0x240 [ 70.971664][ T9064] ? try_to_grab_pending+0x115/0x910 [ 70.976971][ T9064] end_report+0x47/0x4f [ 70.981150][ T9064] ? try_to_grab_pending+0x115/0x910 [ 70.986555][ T9064] __kasan_report.cold+0xe/0x41 [ 70.991416][ T9064] ? try_to_grab_pending+0x115/0x910 [ 70.996679][ T9064] kasan_report+0x12/0x20 [ 71.000992][ T9064] check_memory_region+0x134/0x1a0 [ 71.006168][ T9064] __kasan_check_write+0x14/0x20 [ 71.011084][ T9064] try_to_grab_pending+0x115/0x910 [ 71.016172][ T9064] ? __kasan_check_read+0x11/0x20 [ 71.021171][ T9064] __cancel_work_timer+0xc4/0x540 [ 71.026181][ T9064] ? mod_delayed_work_on+0x200/0x200 [ 71.031447][ T9064] ? console_unlock+0x7dc/0xf00 [ 71.036272][ T9064] ? get_work_pool+0x1b0/0x1b0 [ 71.041013][ T9064] cancel_work_sync+0x18/0x20 [ 71.045671][ T9064] tty_buffer_cancel_work+0x16/0x20 [ 71.050850][ T9064] release_tty+0x261/0x470 [ 71.055250][ T9064] tty_release_struct+0x3c/0x50 [ 71.060081][ T9064] tty_release+0xbcb/0xe90 [ 71.064475][ T9064] __fput+0x2ff/0x890 [ 71.068434][ T9064] ? do_tty_hangup+0x30/0x30 [ 71.073007][ T9064] ____fput+0x16/0x20 [ 71.076967][ T9064] task_work_run+0x145/0x1c0 [ 71.081616][ T9064] do_exit+0x8e7/0x2ef0 [ 71.085773][ T9064] ? mm_update_next_owner+0x7c0/0x7c0 [ 71.091149][ T9064] ? down_read_non_owner+0x490/0x490 [ 71.096421][ T9064] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 71.107021][ T9064] ? handle_mm_fault+0x4ab/0xa50 [ 71.111946][ T9064] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 71.117471][ T9064] do_group_exit+0x135/0x360 [ 71.122047][ T9064] __ia32_sys_exit_group+0x44/0x50 [ 71.127138][ T9064] do_fast_syscall_32+0x27b/0xe16 [ 71.132141][ T9064] entry_SYSENTER_compat+0x70/0x7f [ 71.137228][ T9064] RIP: 0023:0xf7f14a39 [ 71.141295][ T9064] Code: Bad RIP value. [ 71.145361][ T9064] RSP: 002b:00000000ffed556c EFLAGS: 00000296 ORIG_RAX: 00000000000000fc [ 71.153755][ T9064] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000080ed298 [ 71.161843][ T9064] RDX: 0000000000000000 RSI: 00000000080d6fdc RDI: 00000000080ed2a0 [ 71.169814][ T9064] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 71.177770][ T9064] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 71.185720][ T9064] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 71.195147][ T9064] Kernel Offset: disabled [ 71.199538][ T9064] Rebooting in 86400 seconds..