[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.60' (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 executing program 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program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 842.848358] ================================================================== [ 842.855778] BUG: KASAN: use-after-free in __lock_acquire+0x2cb4/0x3ff0 [ 842.862450] Read of size 8 at addr ffff8880aa791e68 by task loop2/23250 [ 842.869201] [ 842.870834] CPU: 0 PID: 23250 Comm: loop2 Not tainted 4.19.161-syzkaller #0 [ 842.877931] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 842.887755] Call Trace: [ 842.890439] dump_stack+0x1fc/0x2fe [ 842.894082] print_address_description.cold+0x54/0x219 [ 842.899344] kasan_report_error.cold+0x8a/0x1c7 [ 842.904020] ? __lock_acquire+0x2cb4/0x3ff0 [ 842.908360] __asan_report_load8_noabort+0x88/0x90 [ 842.913301] ? __lock_acquire+0x2cb4/0x3ff0 [ 842.917652] __lock_acquire+0x2cb4/0x3ff0 [ 842.922496] ? trace_hardirqs_off+0x64/0x200 [ 842.926889] ? __kasan_slab_free+0x186/0x1f0 [ 842.931294] ? kmem_cache_free+0x7f/0x260 [ 842.935456] ? mempool_free+0xe3/0x370 [ 842.939333] ? bio_free+0xee/0x140 [ 842.942853] ? mark_held_locks+0xf0/0xf0 [ 842.946896] ? blk_update_request+0x30f/0xaf0 [ 842.951387] ? blk_mq_end_request+0x4a/0x340 [ 842.955776] ? lo_complete_rq+0x201/0x2d0 [ 842.959918] ? blk_mq_complete_request+0x472/0x660 [ 842.964869] ? loop_queue_work+0x274/0x20c0 [ 842.969177] ? kthread_worker_fn+0x292/0x730 [ 842.973737] ? kthread+0x33f/0x460 [ 842.977258] ? ret_from_fork+0x24/0x30 [ 842.981125] ? debug_check_no_obj_freed+0x201/0x482 [ 842.986642] ? lock_downgrade+0x720/0x720 [ 842.990806] ? lock_acquire+0x170/0x3c0 [ 842.994773] lock_acquire+0x170/0x3c0 [ 842.998564] ? __wake_up_common_lock+0xb0/0x170 [ 843.003230] _raw_spin_lock_irqsave+0x8c/0xc0 [ 843.007968] ? __wake_up_common_lock+0xb0/0x170 [ 843.012635] __wake_up_common_lock+0xb0/0x170 [ 843.017110] ? __wake_up_common+0x650/0x650 [ 843.021506] ? _raw_spin_unlock_irqrestore+0xa3/0xe0 [ 843.026596] lbmIODone+0x44b/0xf40 [ 843.030139] ? lock_downgrade+0x720/0x720 [ 843.034916] ? lock_acquire+0x170/0x3c0 [ 843.038881] ? scale_cookie_change.isra.0+0x380/0x380 [ 843.044155] ? lbmFree+0x100/0x100 [ 843.047856] bio_endio+0x471/0x810 [ 843.051408] blk_update_request+0x30f/0xaf0 [ 843.055736] blk_mq_end_request+0x4a/0x340 [ 843.059957] lo_complete_rq+0x201/0x2d0 [ 843.063931] blk_mq_complete_request+0x472/0x660 [ 843.068672] loop_queue_work+0x274/0x20c0 [ 843.072801] ? finish_task_switch+0x118/0x780 [ 843.077361] ? switch_mm_irqs_off+0x2e5/0x1340 [ 843.081940] ? lo_fallocate.isra.0+0x170/0x170 [ 843.086508] ? kthread_worker_fn+0x217/0x730 [ 843.090898] ? kthread_worker_fn+0x3e4/0x730 [ 843.095289] ? _raw_spin_unlock_irq+0x24/0x80 [ 843.099783] kthread_worker_fn+0x292/0x730 [ 843.104014] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 843.108591] ? __kthread_init_worker+0xf0/0xf0 [ 843.113157] ? __kthread_parkme+0x133/0x1e0 [ 843.117460] ? loop_info64_to_compat+0x5e0/0x5e0 [ 843.122219] kthread+0x33f/0x460 [ 843.125658] ? kthread_park+0x180/0x180 [ 843.129810] ret_from_fork+0x24/0x30 [ 843.133509] [ 843.135121] Allocated by task 23238: [ 843.138903] kmem_cache_alloc_trace+0x12f/0x380 [ 843.143552] lmLogInit+0x301/0x13d0 [ 843.147161] lmLogOpen+0x718/0x11e0 [ 843.150767] jfs_mount_rw+0x286/0x4b0 [ 843.154557] jfs_fill_super+0x814/0xb50 [ 843.158536] mount_bdev+0x2fc/0x3b0 [ 843.162161] mount_fs+0xa3/0x30c [ 843.165508] vfs_kern_mount.part.0+0x68/0x470 [ 843.170097] do_mount+0x113c/0x2f10 [ 843.173711] ksys_mount+0xcf/0x130 [ 843.177234] __x64_sys_mount+0xba/0x150 [ 843.181193] do_syscall_64+0xf9/0x620 [ 843.184984] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 843.190159] [ 843.191787] Freed by task 23238: [ 843.195212] kfree+0xcc/0x210 [ 843.198307] lmLogInit+0xf85/0x13d0 [ 843.201919] lmLogOpen+0x718/0x11e0 [ 843.205529] jfs_mount_rw+0x286/0x4b0 [ 843.209395] jfs_fill_super+0x814/0xb50 [ 843.213368] mount_bdev+0x2fc/0x3b0 [ 843.216982] mount_fs+0xa3/0x30c [ 843.220356] vfs_kern_mount.part.0+0x68/0x470 [ 843.224833] do_mount+0x113c/0x2f10 [ 843.228440] ksys_mount+0xcf/0x130 [ 843.231977] __x64_sys_mount+0xba/0x150 [ 843.235935] do_syscall_64+0xf9/0x620 [ 843.239718] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 843.245070] [ 843.246679] The buggy address belongs to the object at ffff8880aa791e00 [ 843.246679] which belongs to the cache kmalloc-192 of size 192 [ 843.259319] The buggy address is located 104 bytes inside of [ 843.259319] 192-byte region [ffff8880aa791e00, ffff8880aa791ec0) [ 843.271183] The buggy address belongs to the page: [ 843.276109] page:ffffea0002a9e440 count:1 mapcount:0 mapping:ffff88813bff0040 index:0xffff8880aa791900 [ 843.285545] flags: 0xfff00000000100(slab) [ 843.289678] raw: 00fff00000000100 ffffea0002c29348 ffffea000273fe08 ffff88813bff0040 [ 843.297542] raw: ffff8880aa791900 ffff8880aa791000 000000010000000e 0000000000000000 [ 843.305411] page dumped because: kasan: bad access detected [ 843.311110] [ 843.312714] Memory state around the buggy address: [ 843.317637] ffff8880aa791d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 843.324976] ffff8880aa791d80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 843.332332] >ffff8880aa791e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 843.339667] ^ [ 843.346401] ffff8880aa791e80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 843.353781] ffff8880aa791f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 [ 843.361133] ================================================================== [ 843.368475] Disabling lock debugging due to kernel taint [ 843.373931] Kernel panic - not syncing: panic_on_warn set ... [ 843.373931] [ 843.381297] CPU: 0 PID: 23250 Comm: loop2 Tainted: G B 4.19.161-syzkaller #0 [ 843.389765] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 843.399099] Call Trace: [ 843.401674] dump_stack+0x1fc/0x2fe [ 843.405288] panic+0x26a/0x50e [ 843.408464] ? __warn_printk+0xf3/0xf3 [ 843.412344] ? lock_downgrade+0x720/0x720 [ 843.416515] ? print_shadow_for_address+0xb8/0x114 [ 843.421426] ? trace_hardirqs_off+0x64/0x200 [ 843.425818] kasan_end_report+0x43/0x49 [ 843.429967] kasan_report_error.cold+0xa7/0x1c7 [ 843.434762] ? __lock_acquire+0x2cb4/0x3ff0 [ 843.439074] __asan_report_load8_noabort+0x88/0x90 [ 843.443999] ? __lock_acquire+0x2cb4/0x3ff0 [ 843.448305] __lock_acquire+0x2cb4/0x3ff0 [ 843.452463] ? trace_hardirqs_off+0x64/0x200 [ 843.457205] ? __kasan_slab_free+0x186/0x1f0 [ 843.461592] ? kmem_cache_free+0x7f/0x260 [ 843.465721] ? mempool_free+0xe3/0x370 [ 843.469587] ? bio_free+0xee/0x140 [ 843.473106] ? mark_held_locks+0xf0/0xf0 [ 843.477161] ? blk_update_request+0x30f/0xaf0 [ 843.481645] ? blk_mq_end_request+0x4a/0x340 [ 843.486211] ? lo_complete_rq+0x201/0x2d0 [ 843.490354] ? blk_mq_complete_request+0x472/0x660 [ 843.495285] ? loop_queue_work+0x274/0x20c0 [ 843.499604] ? kthread_worker_fn+0x292/0x730 [ 843.503996] ? kthread+0x33f/0x460 [ 843.507516] ? ret_from_fork+0x24/0x30 [ 843.511388] ? debug_check_no_obj_freed+0x201/0x482 [ 843.516386] ? lock_downgrade+0x720/0x720 [ 843.520510] ? lock_acquire+0x170/0x3c0 [ 843.524469] lock_acquire+0x170/0x3c0 [ 843.528268] ? __wake_up_common_lock+0xb0/0x170 [ 843.532920] _raw_spin_lock_irqsave+0x8c/0xc0 [ 843.537397] ? __wake_up_common_lock+0xb0/0x170 [ 843.542046] __wake_up_common_lock+0xb0/0x170 [ 843.546521] ? __wake_up_common+0x650/0x650 [ 843.550844] ? _raw_spin_unlock_irqrestore+0xa3/0xe0 [ 843.555944] lbmIODone+0x44b/0xf40 [ 843.559579] ? lock_downgrade+0x720/0x720 [ 843.563705] ? lock_acquire+0x170/0x3c0 [ 843.567662] ? scale_cookie_change.isra.0+0x380/0x380 [ 843.572831] ? lbmFree+0x100/0x100 [ 843.576361] bio_endio+0x471/0x810 [ 843.579972] blk_update_request+0x30f/0xaf0 [ 843.584275] blk_mq_end_request+0x4a/0x340 [ 843.588493] lo_complete_rq+0x201/0x2d0 [ 843.592451] blk_mq_complete_request+0x472/0x660 [ 843.597189] loop_queue_work+0x274/0x20c0 [ 843.601319] ? finish_task_switch+0x118/0x780 [ 843.605811] ? switch_mm_irqs_off+0x2e5/0x1340 [ 843.610374] ? lo_fallocate.isra.0+0x170/0x170 [ 843.614937] ? kthread_worker_fn+0x217/0x730 [ 843.619337] ? kthread_worker_fn+0x3e4/0x730 [ 843.623740] ? _raw_spin_unlock_irq+0x24/0x80 [ 843.628214] kthread_worker_fn+0x292/0x730 [ 843.632444] ? lockdep_hardirqs_on+0x3a8/0x5c0 [ 843.637027] ? __kthread_init_worker+0xf0/0xf0 [ 843.641599] ? __kthread_parkme+0x133/0x1e0 [ 843.645901] ? loop_info64_to_compat+0x5e0/0x5e0 [ 843.650638] kthread+0x33f/0x460 [ 843.654003] ? kthread_park+0x180/0x180 [ 843.658003] ret_from_fork+0x24/0x30 [ 843.662608] Kernel Offset: disabled [ 843.666220] Rebooting in 86400 seconds..