[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 10.561881] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. [ 11.650946] random: crng init done Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.12' (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 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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 syzkaller login: [ 110.457514] ================================================================== [ 110.458723] BUG: KASAN: use-after-free in disk_unblock_events+0x51/0x60 [ 110.459664] Read of size 8 at addr ffff8801c92540e0 by task blkid/7360 [ 110.460621] [ 110.460879] CPU: 0 PID: 7360 Comm: blkid Not tainted 4.9.128+ #41 [ 110.461772] ffff8801c80df6f8 ffffffff81af2469 ffffea0007249400 ffff8801c92540e0 [ 110.463091] 0000000000000000 ffff8801c92540e0 0000000000000000 ffff8801c80df730 [ 110.464707] ffffffff814e13cb ffff8801c92540e0 0000000000000008 0000000000000000 [ 110.466169] Call Trace: [ 110.466662] [] dump_stack+0xc1/0x128 [ 110.467665] [] print_address_description+0x6c/0x234 [ 110.468930] [] kasan_report.cold.6+0x242/0x2fe [ 110.470061] [] ? disk_unblock_events+0x51/0x60 [ 110.471183] [] __asan_report_load8_noabort+0x14/0x20 [ 110.472438] [] disk_unblock_events+0x51/0x60 [ 110.473490] [] __blkdev_get+0x6b6/0xd60 [ 110.474488] [] ? __blkdev_put+0x840/0x840 [ 110.475460] [] ? fsnotify+0x114/0x1100 [ 110.476412] [] blkdev_get+0x2da/0x920 [ 110.477412] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 110.483274] [] ? bd_may_claim+0xd0/0xd0 [ 110.488885] [] ? bd_acquire+0x27/0x250 [ 110.494398] [] ? bd_acquire+0x88/0x250 [ 110.499915] [] ? _raw_spin_unlock+0x2c/0x50 [ 110.505867] [] blkdev_open+0x1a5/0x250 [ 110.511403] [] do_dentry_open+0x3ef/0xc90 [ 110.517199] [] ? blkdev_get_by_dev+0x70/0x70 [ 110.523254] [] vfs_open+0x11c/0x210 [ 110.528521] [] ? may_open.isra.20+0x14f/0x2a0 [ 110.534650] [] path_openat+0x542/0x2790 [ 110.540268] [] ? path_mountpoint+0x6c0/0x6c0 [ 110.546325] [] ? trace_hardirqs_on+0x10/0x10 [ 110.552383] [] ? expand_files.part.3+0x3a9/0x6d0 [ 110.558785] [] do_filp_open+0x197/0x270 [ 110.564410] [] ? may_open_dev+0xe0/0xe0 [ 110.570033] [] ? _raw_spin_unlock+0x2c/0x50 [ 110.576000] [] ? __alloc_fd+0x1d7/0x4a0 [ 110.581623] [] do_sys_open+0x30d/0x5c0 [ 110.587332] [] ? filp_open+0x70/0x70 [ 110.592694] [] ? up_read+0x1a/0x40 [ 110.597887] [] SyS_open+0x2d/0x40 [ 110.602981] [] ? do_sys_open+0x5c0/0x5c0 [ 110.608676] [] do_syscall_64+0x19f/0x480 [ 110.614389] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 110.621328] [ 110.622945] Allocated by task 7351: [ 110.626575] save_stack_trace+0x16/0x20 [ 110.630545] kasan_kmalloc.part.1+0x62/0xf0 [ 110.634878] kasan_kmalloc+0xaf/0xc0 [ 110.638589] kmem_cache_alloc_trace+0x117/0x2e0 [ 110.643254] alloc_disk_node+0x54/0x3a0 [ 110.647223] alloc_disk+0x18/0x20 [ 110.650663] loop_add+0x33b/0x770 [ 110.654098] loop_probe+0x14f/0x180 [ 110.657720] kobj_lookup+0x223/0x410 [ 110.661423] get_gendisk+0x39/0x2d0 [ 110.665031] blkdev_get+0xf6/0x920 [ 110.668570] blkdev_open+0x1a5/0x250 [ 110.672275] do_dentry_open+0x3ef/0xc90 [ 110.676232] vfs_open+0x11c/0x210 [ 110.679672] path_openat+0x542/0x2790 [ 110.683468] do_filp_open+0x197/0x270 [ 110.687258] do_sys_open+0x30d/0x5c0 [ 110.690956] SyS_open+0x2d/0x40 [ 110.694222] do_syscall_64+0x19f/0x480 [ 110.698090] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 110.703169] [ 110.704786] Freed by task 7360: [ 110.708060] save_stack_trace+0x16/0x20 [ 110.712016] kasan_slab_free+0xac/0x190 [ 110.715976] kfree+0xfb/0x310 [ 110.719078] disk_release+0x259/0x330 [ 110.722868] device_release+0x7e/0x220 [ 110.726740] kobject_put+0x148/0x250 [ 110.730449] put_disk+0x23/0x30 [ 110.733718] __blkdev_get+0x616/0xd60 [ 110.737499] blkdev_get+0x2da/0x920 [ 110.741117] blkdev_open+0x1a5/0x250 [ 110.744827] do_dentry_open+0x3ef/0xc90 [ 110.748784] vfs_open+0x11c/0x210 [ 110.752225] path_openat+0x542/0x2790 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 110.756021] do_filp_open+0x197/0x270 [ 110.759819] do_sys_open+0x30d/0x5c0 [ 110.763527] SyS_open+0x2d/0x40 [ 110.766820] do_syscall_64+0x19f/0x480 [ 110.770703] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 110.775818] [ 110.777427] The buggy address belongs to the object at ffff8801c9253b80 [ 110.777427] which belongs to the cache kmalloc-2048 of size 2048 [ 110.790248] The buggy address is located 1376 bytes inside of [ 110.790248] 2048-byte region [ffff8801c9253b80, ffff8801c9254380) [ 110.802295] The buggy address belongs to the page: [ 110.802308] page:ffffea0007249400 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0 [ 110.802312] flags: 0x4000000000004080(slab|head) [ 110.802314] page dumped because: kasan: bad access detected [ 110.802316] [ 110.802317] Memory state around the buggy address: [ 110.802324] ffff8801c9253f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 110.802328] ffff8801c9254000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 110.802333] >ffff8801c9254080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 110.802336] ^ [ 110.802341] ffff8801c9254100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 110.802346] ffff8801c9254180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 110.802348] ================================================================== [ 110.802350] Disabling lock debugging due to kernel taint [ 110.807801] Kernel panic - not syncing: panic_on_warn set ... [ 110.807801] [ 110.807819] CPU: 0 PID: 7360 Comm: blkid Tainted: G B 4.9.128+ #41 [ 110.807832] ffff8801c80df658 ffffffff81af2469 ffffffff82c34968 00000000ffffffff [ 110.807842] 0000000000000000 0000000000000000 0000000000000000 ffff8801c80df718 [ 110.807851] ffffffff813df985 0000000041b58ab3 ffffffff82c2896b ffffffff813df7c6 [ 110.807853] Call Trace: [ 110.807867] [] dump_stack+0xc1/0x128 [ 110.807876] [] panic+0x1bf/0x39f [ 110.807884] [] ? add_taint.cold.6+0x16/0x16 [ 110.807895] [] ? ___preempt_schedule+0x16/0x18 [ 110.807905] [] kasan_end_report+0x47/0x4f [ 110.807913] [] kasan_report.cold.6+0x76/0x2fe [ 110.807921] [] ? disk_unblock_events+0x51/0x60 [ 110.807930] [] __asan_report_load8_noabort+0x14/0x20 [ 110.807938] [] disk_unblock_events+0x51/0x60 [ 110.807945] [] __blkdev_get+0x6b6/0xd60 [ 110.807953] [] ? __blkdev_put+0x840/0x840 [ 110.807961] [] ? fsnotify+0x114/0x1100 [ 110.807968] [] blkdev_get+0x2da/0x920 [ 110.807977] [] ? debug_lockdep_rcu_enabled+0x77/0x90 [ 110.807984] [] ? bd_may_claim+0xd0/0xd0 [ 110.807990] [] ? bd_acquire+0x27/0x250 [ 110.807997] [] ? bd_acquire+0x88/0x250 [ 110.808007] [] ? _raw_spin_unlock+0x2c/0x50 [ 110.808014] [] blkdev_open+0x1a5/0x250 [ 110.808021] [] do_dentry_open+0x3ef/0xc90 [ 110.808028] [] ? blkdev_get_by_dev+0x70/0x70 [ 110.808036] [] vfs_open+0x11c/0x210 [ 110.808044] [] ? may_open.isra.20+0x14f/0x2a0 [ 110.808059] [] path_openat+0x542/0x2790 [ 110.808067] [] ? path_mountpoint+0x6c0/0x6c0 [ 110.808076] [] ? trace_hardirqs_on+0x10/0x10 [ 110.808085] [] ? expand_files.part.3+0x3a9/0x6d0 [ 110.808092] [] do_filp_open+0x197/0x270 [ 110.808100] [] ? may_open_dev+0xe0/0xe0 [ 110.808108] [] ? _raw_spin_unlock+0x2c/0x50 [ 110.808115] [] ? __alloc_fd+0x1d7/0x4a0 [ 110.808123] [] do_sys_open+0x30d/0x5c0 [ 110.808131] [] ? filp_open+0x70/0x70 [ 110.808140] [] ? up_read+0x1a/0x40 [ 110.808148] [] SyS_open+0x2d/0x40 [ 110.808156] [] ? do_sys_open+0x5c0/0x5c0 [ 110.808163] [] do_syscall_64+0x19f/0x480 [ 110.808171] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 110.808214] Kernel Offset: disabled [ 111.153989] Rebooting in 86400 seconds..