[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.116' (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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 803.854402] ================================================================== [ 803.861815] BUG: KASAN: use-after-free in __lock_acquire+0x2c57/0x3f20 [ 803.868473] Read of size 8 at addr ffff8880a928ae68 by task loop5/25644 [ 803.875214] [ 803.876838] CPU: 1 PID: 25644 Comm: loop5 Not tainted 4.14.218-syzkaller #0 [ 803.883927] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 803.893273] Call Trace: [ 803.895975] dump_stack+0x1b2/0x281 [ 803.899599] print_address_description.cold+0x54/0x1d3 [ 803.904871] kasan_report_error.cold+0x8a/0x191 [ 803.909537] ? __lock_acquire+0x2c57/0x3f20 [ 803.913852] __asan_report_load8_noabort+0x68/0x70 [ 803.919325] ? check_preemption_disabled+0x10/0x240 [ 803.924336] ? __lock_acquire+0x2c57/0x3f20 [ 803.928649] __lock_acquire+0x2c57/0x3f20 [ 803.932791] ? kasan_slab_free+0x12d/0x1a0 [ 803.937019] ? kasan_slab_free+0xc3/0x1a0 [ 803.941156] ? kmem_cache_free+0x7c/0x2b0 [ 803.945298] ? mempool_free+0xcf/0x1d0 [ 803.949178] ? bio_free+0x11f/0x1a0 [ 803.952793] ? bio_put+0x59/0x70 [ 803.956152] ? lbmIODone+0xca/0xe00 [ 803.959803] ? bio_endio+0x27a/0x680 [ 803.963504] ? blk_update_request+0x2d0/0xa30 [ 803.967989] ? blk_mq_end_request+0x4c/0x1e0 [ 803.972394] ? trace_hardirqs_on+0x10/0x10 [ 803.976622] ? kthread_worker_fn+0x271/0x6c0 [ 803.981024] ? kthread+0x30d/0x420 [ 803.984563] ? ret_from_fork+0x24/0x30 [ 803.988473] ? lock_acquire+0x170/0x3f0 [ 803.992443] ? lock_downgrade+0x740/0x740 [ 803.996585] ? current_time+0x89/0xb0 [ 804.000378] lock_acquire+0x170/0x3f0 [ 804.004173] ? __wake_up_common_lock+0x9d/0x140 [ 804.008857] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 804.013627] _raw_spin_lock_irqsave+0x8c/0xc0 [ 804.018118] ? __wake_up_common_lock+0x9d/0x140 [ 804.022801] __wake_up_common_lock+0x9d/0x140 [ 804.027291] ? __wake_up_common+0x5d0/0x5d0 [ 804.031609] ? _raw_spin_unlock_irqrestore+0xa3/0xe0 [ 804.036707] lbmIODone+0x3c6/0xe00 [ 804.040247] ? lock_acquire+0x170/0x3f0 [ 804.044299] ? lock_downgrade+0x740/0x740 [ 804.048437] ? lbmFree+0x100/0x100 [ 804.051970] bio_endio+0x27a/0x680 [ 804.055503] blk_update_request+0x2d0/0xa30 [ 804.059818] blk_mq_end_request+0x4c/0x1e0 [ 804.064048] __blk_mq_complete_request+0x30b/0x6c0 [ 804.068974] blk_mq_complete_request+0x52/0x60 [ 804.073548] loop_queue_work+0x227/0x1e80 [ 804.077691] ? finish_task_switch+0x178/0x610 [ 804.082207] ? finish_task_switch+0x14d/0x610 [ 804.086695] ? lo_fallocate.isra.0+0x120/0x120 [ 804.091267] ? __schedule+0x893/0x1de0 [ 804.095321] ? lock_acquire+0x170/0x3f0 [ 804.099327] ? _raw_spin_unlock_irq+0x24/0x80 [ 804.103813] kthread_worker_fn+0x271/0x6c0 [ 804.108048] ? __kthread_init_worker+0xf0/0xf0 [ 804.112650] ? loop_get_status64+0x100/0x100 [ 804.117055] kthread+0x30d/0x420 [ 804.120415] ? kthread_create_on_node+0xd0/0xd0 [ 804.125076] ret_from_fork+0x24/0x30 [ 804.128865] [ 804.130485] Allocated by task 25628: [ 804.134191] kasan_kmalloc+0xeb/0x160 [ 804.137984] kmem_cache_alloc_trace+0x131/0x3d0 [ 804.142672] lmLogInit+0x2f1/0x12f0 [ 804.146289] lmLogOpen+0x6b1/0x10e0 [ 804.149910] jfs_mount_rw+0x236/0x430 [ 804.153701] jfs_fill_super+0x78a/0xab0 [ 804.157665] mount_bdev+0x2b3/0x360 [ 804.161370] mount_fs+0x92/0x2a0 [ 804.164727] vfs_kern_mount.part.0+0x5b/0x470 [ 804.169219] do_mount+0xe53/0x2a00 [ 804.172751] SyS_mount+0xa8/0x120 [ 804.176197] do_syscall_64+0x1d5/0x640 [ 804.180105] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 804.185280] [ 804.186895] Freed by task 25628: [ 804.190257] kasan_slab_free+0xc3/0x1a0 [ 804.194262] kfree+0xc9/0x250 [ 804.197360] lmLogInit+0xeaf/0x12f0 [ 804.200977] lmLogOpen+0x6b1/0x10e0 [ 804.204592] jfs_mount_rw+0x236/0x430 [ 804.208384] jfs_fill_super+0x78a/0xab0 [ 804.212348] mount_bdev+0x2b3/0x360 [ 804.215964] mount_fs+0x92/0x2a0 [ 804.219319] vfs_kern_mount.part.0+0x5b/0x470 [ 804.223810] do_mount+0xe53/0x2a00 [ 804.227340] SyS_mount+0xa8/0x120 [ 804.230786] do_syscall_64+0x1d5/0x640 [ 804.234664] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 804.239837] [ 804.241456] The buggy address belongs to the object at ffff8880a928ae00 [ 804.241456] which belongs to the cache kmalloc-192 of size 192 [ 804.254101] The buggy address is located 104 bytes inside of [ 804.254101] 192-byte region [ffff8880a928ae00, ffff8880a928aec0) [ 804.265965] The buggy address belongs to the page: [ 804.270915] page:ffffea0002a4a280 count:1 mapcount:0 mapping:ffff8880a928a000 index:0x0 [ 804.279046] flags: 0xfff00000000100(slab) [ 804.283187] raw: 00fff00000000100 ffff8880a928a000 0000000000000000 0000000100000010 [ 804.291061] raw: ffffea000278e3a0 ffffea000274eae0 ffff88813fe80040 0000000000000000 [ 804.298928] page dumped because: kasan: bad access detected [ 804.304627] [ 804.306240] Memory state around the buggy address: [ 804.311158] ffff8880a928ad00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 804.318768] ffff8880a928ad80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 804.326117] >ffff8880a928ae00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 804.333462] ^ [ 804.340202] ffff8880a928ae80: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 804.347551] ffff8880a928af00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 804.354906] ================================================================== [ 804.362253] Disabling lock debugging due to kernel taint [ 804.367698] Kernel panic - not syncing: panic_on_warn set ... [ 804.367698] [ 804.375051] CPU: 1 PID: 25644 Comm: loop5 Tainted: G B 4.14.218-syzkaller #0 [ 804.383352] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 804.392694] Call Trace: [ 804.395294] dump_stack+0x1b2/0x281 [ 804.398915] panic+0x1f9/0x42d [ 804.402099] ? add_taint.cold+0x16/0x16 [ 804.406067] ? lock_downgrade+0x740/0x740 [ 804.410207] kasan_end_report+0x43/0x49 [ 804.414176] kasan_report_error.cold+0xa7/0x191 [ 804.418836] ? __lock_acquire+0x2c57/0x3f20 [ 804.423163] __asan_report_load8_noabort+0x68/0x70 [ 804.428087] ? check_preemption_disabled+0x10/0x240 [ 804.433098] ? __lock_acquire+0x2c57/0x3f20 [ 804.437435] __lock_acquire+0x2c57/0x3f20 [ 804.441601] ? kasan_slab_free+0x12d/0x1a0 [ 804.445828] ? kasan_slab_free+0xc3/0x1a0 [ 804.449968] ? kmem_cache_free+0x7c/0x2b0 [ 804.454121] ? mempool_free+0xcf/0x1d0 [ 804.458003] ? bio_free+0x11f/0x1a0 [ 804.461621] ? bio_put+0x59/0x70 [ 804.464975] ? lbmIODone+0xca/0xe00 [ 804.468598] ? bio_endio+0x27a/0x680 [ 804.472299] ? blk_update_request+0x2d0/0xa30 [ 804.476786] ? blk_mq_end_request+0x4c/0x1e0 [ 804.481188] ? trace_hardirqs_on+0x10/0x10 [ 804.485412] ? kthread_worker_fn+0x271/0x6c0 [ 804.489810] ? kthread+0x30d/0x420 [ 804.493341] ? ret_from_fork+0x24/0x30 [ 804.497220] ? lock_acquire+0x170/0x3f0 [ 804.501183] ? lock_downgrade+0x740/0x740 [ 804.505328] ? current_time+0x89/0xb0 [ 804.509120] lock_acquire+0x170/0x3f0 [ 804.512912] ? __wake_up_common_lock+0x9d/0x140 [ 804.517573] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 804.522322] _raw_spin_lock_irqsave+0x8c/0xc0 [ 804.526812] ? __wake_up_common_lock+0x9d/0x140 [ 804.531472] __wake_up_common_lock+0x9d/0x140 [ 804.535961] ? __wake_up_common+0x5d0/0x5d0 [ 804.540289] ? _raw_spin_unlock_irqrestore+0xa3/0xe0 [ 804.545382] lbmIODone+0x3c6/0xe00 [ 804.548918] ? lock_acquire+0x170/0x3f0 [ 804.552882] ? lock_downgrade+0x740/0x740 [ 804.557019] ? lbmFree+0x100/0x100 [ 804.560554] bio_endio+0x27a/0x680 [ 804.564085] blk_update_request+0x2d0/0xa30 [ 804.568404] blk_mq_end_request+0x4c/0x1e0 [ 804.572632] __blk_mq_complete_request+0x30b/0x6c0 [ 804.577556] blk_mq_complete_request+0x52/0x60 [ 804.582131] loop_queue_work+0x227/0x1e80 [ 804.586277] ? finish_task_switch+0x178/0x610 [ 804.590761] ? finish_task_switch+0x14d/0x610 [ 804.595246] ? lo_fallocate.isra.0+0x120/0x120 [ 804.599817] ? __schedule+0x893/0x1de0 [ 804.603698] ? lock_acquire+0x170/0x3f0 [ 804.607666] ? _raw_spin_unlock_irq+0x24/0x80 [ 804.612155] kthread_worker_fn+0x271/0x6c0 [ 804.616382] ? __kthread_init_worker+0xf0/0xf0 [ 804.621337] ? loop_get_status64+0x100/0x100 [ 804.625737] kthread+0x30d/0x420 [ 804.629095] ? kthread_create_on_node+0xd0/0xd0 [ 804.633764] ret_from_fork+0x24/0x30 [ 804.638469] Kernel Offset: disabled [ 804.642213] Rebooting in 86400 seconds..