[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.27' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 1350.852269] audit: type=1400 audit(1603251541.323:8): avc: denied { execmem } for pid=6373 comm="syz-executor150" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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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program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 1386.391116] random: crng init done [ 1386.394692] random: 7 urandom warning(s) missed due to ratelimiting executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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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program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 1733.233101] ================================================================== [ 1733.240575] BUG: KASAN: use-after-free in __lock_acquire+0x2c57/0x3f20 [ 1733.247224] Read of size 8 at addr ffff8880a17de568 by task loop0/13421 [ 1733.253955] [ 1733.255567] CPU: 1 PID: 13421 Comm: loop0 Not tainted 4.14.198-syzkaller #0 [ 1733.262663] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1733.272002] Call Trace: [ 1733.274643] dump_stack+0x1b2/0x283 [ 1733.278289] print_address_description.cold+0x54/0x1d3 [ 1733.283552] kasan_report_error.cold+0x8a/0x194 [ 1733.288207] ? __lock_acquire+0x2c57/0x3f20 [ 1733.292509] __asan_report_load8_noabort+0x68/0x70 [ 1733.297485] ? check_preemption_disabled+0x10/0x240 [ 1733.302484] ? __lock_acquire+0x2c57/0x3f20 [ 1733.306786] __lock_acquire+0x2c57/0x3f20 [ 1733.311179] ? kasan_slab_free+0x12d/0x1a0 [ 1733.315394] ? kasan_slab_free+0xc3/0x1a0 [ 1733.319541] ? kmem_cache_free+0x7c/0x2b0 [ 1733.323704] ? mempool_free+0xcf/0x1d0 [ 1733.327630] ? bio_free+0x11f/0x1a0 [ 1733.331240] ? bio_put+0x59/0x70 [ 1733.334614] ? lbmIODone+0xca/0xe00 [ 1733.338223] ? bio_endio+0x27a/0x680 [ 1733.341943] ? blk_update_request+0x2d0/0xa30 [ 1733.346451] ? blk_mq_end_request+0x4c/0x1e0 [ 1733.350847] ? trace_hardirqs_on+0x10/0x10 [ 1733.355091] ? kthread_worker_fn+0x271/0x6c0 [ 1733.359479] ? kthread+0x30d/0x420 [ 1733.363031] ? ret_from_fork+0x24/0x30 [ 1733.366918] ? lock_acquire+0x170/0x3f0 [ 1733.370888] ? lock_downgrade+0x740/0x740 [ 1733.375068] ? current_time+0x89/0xb0 [ 1733.378856] lock_acquire+0x170/0x3f0 [ 1733.382710] ? __wake_up_common_lock+0x9d/0x140 [ 1733.387370] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 1733.392127] _raw_spin_lock_irqsave+0x8c/0xc0 [ 1733.396624] ? __wake_up_common_lock+0x9d/0x140 [ 1733.401274] __wake_up_common_lock+0x9d/0x140 [ 1733.405751] ? __wake_up_common+0x5d0/0x5d0 [ 1733.410057] ? _raw_spin_unlock_irqrestore+0xa3/0xe0 [ 1733.415164] lbmIODone+0x3c6/0xe00 [ 1733.418690] ? lock_acquire+0x170/0x3f0 [ 1733.422647] ? lock_downgrade+0x740/0x740 [ 1733.426777] ? lbmFree+0x100/0x100 [ 1733.430300] bio_endio+0x27a/0x680 [ 1733.433825] blk_update_request+0x2d0/0xa30 [ 1733.438143] blk_mq_end_request+0x4c/0x1e0 [ 1733.442367] __blk_mq_complete_request+0x30b/0x6c0 [ 1733.447294] blk_mq_complete_request+0x52/0x60 [ 1733.451924] loop_queue_work+0x227/0x1e80 [ 1733.456077] ? finish_task_switch+0x178/0x610 [ 1733.460556] ? finish_task_switch+0x14d/0x610 [ 1733.465033] ? lo_fallocate.isra.0+0x120/0x120 [ 1733.469608] ? __schedule+0x893/0x1de0 [ 1733.473478] ? lock_acquire+0x170/0x3f0 [ 1733.477435] ? _raw_spin_unlock_irq+0x24/0x80 [ 1733.481919] kthread_worker_fn+0x271/0x6c0 [ 1733.486135] ? __kthread_init_worker+0xf0/0xf0 [ 1733.490712] ? loop_get_status64+0x100/0x100 [ 1733.495107] kthread+0x30d/0x420 [ 1733.498457] ? kthread_create_on_node+0xd0/0xd0 [ 1733.503113] ret_from_fork+0x24/0x30 [ 1733.506808] [ 1733.508413] Allocated by task 13420: [ 1733.512127] kasan_kmalloc+0xeb/0x160 [ 1733.515909] kmem_cache_alloc_trace+0x131/0x3d0 [ 1733.520619] lmLogInit+0x2f1/0x12f0 [ 1733.524228] lmLogOpen+0x6b1/0x10e0 [ 1733.527836] jfs_mount_rw+0x236/0x430 [ 1733.531616] jfs_fill_super+0x78a/0xab0 [ 1733.535640] mount_bdev+0x2b3/0x360 [ 1733.539260] mount_fs+0x92/0x2a0 [ 1733.542606] vfs_kern_mount.part.0+0x5b/0x470 [ 1733.547099] do_mount+0xe53/0x2a00 [ 1733.550620] SyS_mount+0xa8/0x120 [ 1733.554058] do_syscall_64+0x1d5/0x640 [ 1733.557926] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1733.563104] [ 1733.564727] Freed by task 13420: [ 1733.568081] kasan_slab_free+0xc3/0x1a0 [ 1733.572032] kfree+0xc9/0x250 [ 1733.575126] lmLogInit+0xeaf/0x12f0 [ 1733.578743] lmLogOpen+0x6b1/0x10e0 [ 1733.582362] jfs_mount_rw+0x236/0x430 [ 1733.586152] jfs_fill_super+0x78a/0xab0 [ 1733.590121] mount_bdev+0x2b3/0x360 [ 1733.593740] mount_fs+0x92/0x2a0 [ 1733.597117] vfs_kern_mount.part.0+0x5b/0x470 [ 1733.601597] do_mount+0xe53/0x2a00 [ 1733.605141] SyS_mount+0xa8/0x120 [ 1733.608593] do_syscall_64+0x1d5/0x640 [ 1733.612472] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 1733.617653] [ 1733.619266] The buggy address belongs to the object at ffff8880a17de500 [ 1733.619266] which belongs to the cache kmalloc-192 of size 192 [ 1733.632278] The buggy address is located 104 bytes inside of [ 1733.632278] 192-byte region [ffff8880a17de500, ffff8880a17de5c0) [ 1733.650809] The buggy address belongs to the page: [ 1733.655720] page:ffffea000285f780 count:1 mapcount:0 mapping:ffff8880a17de000 index:0x0 [ 1733.663933] flags: 0xfffe0000000100(slab) [ 1733.668077] raw: 00fffe0000000100 ffff8880a17de000 0000000000000000 0000000100000010 [ 1733.675954] raw: ffffea00023af820 ffffea00022c2820 ffff88812fe50040 0000000000000000 [ 1733.683824] page dumped because: kasan: bad access detected [ 1733.689511] [ 1733.691116] Memory state around the buggy address: [ 1733.696111] ffff8880a17de400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1733.703469] ffff8880a17de480: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 1733.710824] >ffff8880a17de500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1733.718164] ^ [ 1733.724906] ffff8880a17de580: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc [ 1733.732360] ffff8880a17de600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 1733.739698] ================================================================== [ 1733.747036] Disabling lock debugging due to kernel taint [ 1733.752997] Kernel panic - not syncing: panic_on_warn set ... [ 1733.752997] [ 1733.761335] CPU: 1 PID: 13421 Comm: loop0 Tainted: G B 4.14.198-syzkaller #0 [ 1733.771065] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1733.780495] Call Trace: [ 1733.783075] dump_stack+0x1b2/0x283 [ 1733.786951] panic+0x1f9/0x42d [ 1733.790146] ? add_taint.cold+0x16/0x16 [ 1733.794120] ? lock_downgrade+0x740/0x740 [ 1733.798255] kasan_end_report+0x43/0x49 [ 1733.802650] kasan_report_error.cold+0xa7/0x194 [ 1733.807321] ? __lock_acquire+0x2c57/0x3f20 [ 1733.811660] __asan_report_load8_noabort+0x68/0x70 [ 1733.816599] ? check_preemption_disabled+0x10/0x240 [ 1733.821603] ? __lock_acquire+0x2c57/0x3f20 [ 1733.825915] __lock_acquire+0x2c57/0x3f20 [ 1733.830060] ? kasan_slab_free+0x12d/0x1a0 [ 1733.834283] ? kasan_slab_free+0xc3/0x1a0 [ 1733.838419] ? kmem_cache_free+0x7c/0x2b0 [ 1733.842566] ? mempool_free+0xcf/0x1d0 [ 1733.846439] ? bio_free+0x11f/0x1a0 [ 1733.850046] ? bio_put+0x59/0x70 [ 1733.853409] ? lbmIODone+0xca/0xe00 [ 1733.857041] ? bio_endio+0x27a/0x680 [ 1733.860743] ? blk_update_request+0x2d0/0xa30 [ 1733.865239] ? blk_mq_end_request+0x4c/0x1e0 [ 1733.869655] ? trace_hardirqs_on+0x10/0x10 [ 1733.874033] ? kthread_worker_fn+0x271/0x6c0 [ 1733.878431] ? kthread+0x30d/0x420 [ 1733.881966] ? ret_from_fork+0x24/0x30 [ 1733.885869] ? lock_acquire+0x170/0x3f0 [ 1733.889853] ? lock_downgrade+0x740/0x740 [ 1733.893986] ? current_time+0x89/0xb0 [ 1733.897773] lock_acquire+0x170/0x3f0 [ 1733.901739] ? __wake_up_common_lock+0x9d/0x140 [ 1733.906399] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 1733.912373] _raw_spin_lock_irqsave+0x8c/0xc0 [ 1733.916875] ? __wake_up_common_lock+0x9d/0x140 [ 1733.921549] __wake_up_common_lock+0x9d/0x140 [ 1733.926030] ? __wake_up_common+0x5d0/0x5d0 [ 1733.930536] ? _raw_spin_unlock_irqrestore+0xa3/0xe0 [ 1733.935623] lbmIODone+0x3c6/0xe00 [ 1733.939156] ? lock_acquire+0x170/0x3f0 [ 1733.943147] ? lock_downgrade+0x740/0x740 [ 1733.947456] ? lbmFree+0x100/0x100 [ 1733.950979] bio_endio+0x27a/0x680 [ 1733.954704] blk_update_request+0x2d0/0xa30 [ 1733.959035] blk_mq_end_request+0x4c/0x1e0 [ 1733.963272] __blk_mq_complete_request+0x30b/0x6c0 [ 1733.968201] blk_mq_complete_request+0x52/0x60 [ 1733.972770] loop_queue_work+0x227/0x1e80 [ 1733.976903] ? finish_task_switch+0x178/0x610 [ 1733.981471] ? finish_task_switch+0x14d/0x610 [ 1733.985948] ? lo_fallocate.isra.0+0x120/0x120 [ 1733.990780] ? __schedule+0x893/0x1de0 [ 1733.994773] ? lock_acquire+0x170/0x3f0 [ 1733.999092] ? _raw_spin_unlock_irq+0x24/0x80 [ 1734.003588] kthread_worker_fn+0x271/0x6c0 [ 1734.007846] ? __kthread_init_worker+0xf0/0xf0 [ 1734.012416] ? loop_get_status64+0x100/0x100 [ 1734.016822] kthread+0x30d/0x420 [ 1734.020176] ? kthread_create_on_node+0xd0/0xd0 [ 1734.024843] ret_from_fork+0x24/0x30 [ 1734.029906] Kernel Offset: disabled [ 1734.033522] Rebooting in 86400 seconds..