[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.243160] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.080813] random: sshd: uninitialized urandom read (32 bytes read) [ 19.580376] random: sshd: uninitialized urandom read (32 bytes read) [ 20.480104] random: sshd: uninitialized urandom read (32 bytes read) [ 20.609998] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.61' (ECDSA) to the list of known hosts. [ 26.568160] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 34.859416] ================================================================== [ 34.866825] BUG: KASAN: use-after-free in work_is_static_object+0x39/0x40 [ 34.873752] Read of size 8 at addr ffff8801c03efca0 by task kworker/1:2/4418 [ 34.880932] [ 34.882557] CPU: 1 PID: 4418 Comm: kworker/1:2 Not tainted 4.9.111-g03c70fe #10 [ 34.889984] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.899346] Workqueue: events p9_poll_workfn [ 34.903860] ffff8801d462f9c8 ffffffff81eb2729 ffffea000700fb80 ffff8801c03efca0 [ 34.911875] 0000000000000000 ffff8801c03efca0 0000000000000000 ffff8801d462fa00 [ 34.919890] ffffffff81567b59 ffff8801c03efca0 0000000000000008 0000000000000000 [ 34.927902] Call Trace: [ 34.930481] [] dump_stack+0xc1/0x128 [ 34.935827] [] print_address_description+0x6c/0x234 [ 34.942473] [] kasan_report.cold.6+0x242/0x2fe [ 34.948692] [] ? work_is_static_object+0x39/0x40 [ 34.955075] [] __asan_report_load8_noabort+0x14/0x20 [ 34.961808] [] work_is_static_object+0x39/0x40 [ 34.968025] [] debug_object_activate+0x22d/0x4e0 [ 34.974420] [] ? debug_object_assert_init+0x380/0x380 [ 34.981248] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 34.988070] [] __queue_work+0x48/0xf10 [ 34.993588] [] ? p9_pollwake+0x110/0x110 [ 34.999287] [] queue_work_on+0x97/0xa0 [ 35.004800] [] p9_poll_workfn+0x28a/0x330 [ 35.010581] [] process_one_work+0x7e1/0x1500 [ 35.016625] [] ? process_one_work+0x728/0x1500 [ 35.022841] [] ? pwq_dec_nr_in_flight+0x2e0/0x2e0 [ 35.029323] [] worker_thread+0xd6/0x10a0 [ 35.035029] [] ? __schedule+0x655/0x1bd0 [ 35.040732] [] kthread+0x26d/0x300 [ 35.045898] [] ? process_one_work+0x1500/0x1500 [ 35.052194] [] ? kthread_park+0xa0/0xa0 [ 35.057801] [] ? kthread_park+0xa0/0xa0 [ 35.063407] [] ? kthread_park+0xa0/0xa0 [ 35.069023] [] ret_from_fork+0x5c/0x70 [ 35.074542] [ 35.076153] Allocated by task 7490: [ 35.079764] save_stack_trace+0x16/0x20 [ 35.083729] save_stack+0x43/0xd0 [ 35.087168] kasan_kmalloc+0xc7/0xe0 [ 35.090871] kmem_cache_alloc_trace+0xfd/0x2b0 [ 35.095435] p9_fd_create+0xf3/0x330 [ 35.099141] p9_client_create+0x6ff/0x10a0 [ 35.103354] v9fs_session_init+0x333/0x13a0 [ 35.107653] v9fs_mount+0x7d/0x810 [ 35.111171] mount_fs+0x28c/0x370 [ 35.114601] vfs_kern_mount.part.29+0xd1/0x3d0 [ 35.119159] do_mount+0x3c9/0x2740 [ 35.122674] compat_SyS_mount+0x4fc/0xff0 [ 35.126793] do_fast_syscall_32+0x2f7/0x870 [ 35.131092] entry_SYSENTER_compat+0x90/0xa2 [ 35.135480] [ 35.137085] Freed by task 7490: [ 35.140351] save_stack_trace+0x16/0x20 [ 35.144314] save_stack+0x43/0xd0 [ 35.147743] kasan_slab_free+0x72/0xc0 [ 35.151643] kfree+0xfb/0x310 [ 35.154734] p9_fd_close+0x298/0x330 [ 35.158437] p9_client_create+0x825/0x10a0 [ 35.162659] v9fs_session_init+0x333/0x13a0 [ 35.166967] v9fs_mount+0x7d/0x810 [ 35.170491] mount_fs+0x28c/0x370 [ 35.173926] vfs_kern_mount.part.29+0xd1/0x3d0 [ 35.178494] do_mount+0x3c9/0x2740 [ 35.182009] compat_SyS_mount+0x4fc/0xff0 [ 35.186145] do_fast_syscall_32+0x2f7/0x870 [ 35.190443] entry_SYSENTER_compat+0x90/0xa2 [ 35.194819] [ 35.196422] The buggy address belongs to the object at ffff8801c03efb80 [ 35.196422] which belongs to the cache kmalloc-512 of size 512 [ 35.209145] The buggy address is located 288 bytes inside of [ 35.209145] 512-byte region [ffff8801c03efb80, ffff8801c03efd80) [ 35.221001] The buggy address belongs to the page: [ 35.225910] page:ffffea000700fb80 count:1 mapcount:0 mapping: (null) index:0xffff8801c03ef900 compound_mapcount: 0 [ 35.237390] flags: 0x8000000000004080(slab|head) [ 35.242123] page dumped because: kasan: bad access detected [ 35.247805] [ 35.249432] Memory state around the buggy address: [ 35.254439] ffff8801c03efb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 35.261784] ffff8801c03efc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 35.269122] >ffff8801c03efc80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 35.276460] ^ [ 35.280841] ffff8801c03efd00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 35.288175] ffff8801c03efd80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 35.295509] ================================================================== [ 35.302851] Disabling lock debugging due to kernel taint [ 35.308283] Kernel panic - not syncing: panic_on_warn set ... [ 35.308283] [ 35.315709] CPU: 1 PID: 4418 Comm: kworker/1:2 Tainted: G B 4.9.111-g03c70fe #10 [ 35.324342] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.333681] Workqueue: events p9_poll_workfn [ 35.338185] ffff8801d462f928 ffffffff81eb2729 ffffffff843c71a7 00000000ffffffff [ 35.346294] 0000000000000000 0000000000000001 0000000000000000 ffff8801d462f9e8 [ 35.354286] ffffffff814219f5 0000000041b58ab3 ffffffff843ba8c0 ffffffff81421836 [ 35.362267] Call Trace: [ 35.364833] [] dump_stack+0xc1/0x128 [ 35.370170] [] panic+0x1bf/0x3bc [ 35.375166] [] ? add_taint.cold.6+0x16/0x16 [ 35.381121] [] ? kasan_end_report+0x32/0x4f [ 35.387075] [] kasan_end_report+0x47/0x4f [ 35.392848] [] kasan_report.cold.6+0x76/0x2fe [ 35.399315] [] ? work_is_static_object+0x39/0x40 [ 35.405705] [] __asan_report_load8_noabort+0x14/0x20 [ 35.412430] [] work_is_static_object+0x39/0x40 [ 35.418639] [] debug_object_activate+0x22d/0x4e0 [ 35.425027] [] ? debug_object_assert_init+0x380/0x380 [ 35.431856] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 35.438672] [] __queue_work+0x48/0xf10 [ 35.444184] [] ? p9_pollwake+0x110/0x110 [ 35.449870] [] queue_work_on+0x97/0xa0 [ 35.455390] [] p9_poll_workfn+0x28a/0x330 [ 35.461171] [] process_one_work+0x7e1/0x1500 [ 35.467211] [] ? process_one_work+0x728/0x1500 [ 35.473432] [] ? pwq_dec_nr_in_flight+0x2e0/0x2e0 [ 35.479916] [] worker_thread+0xd6/0x10a0 [ 35.485604] [] ? __schedule+0x655/0x1bd0 [ 35.491301] [] kthread+0x26d/0x300 [ 35.496478] [] ? process_one_work+0x1500/0x1500 [ 35.502773] [] ? kthread_park+0xa0/0xa0 [ 35.508370] [] ? kthread_park+0xa0/0xa0 [ 35.513978] [] ? kthread_park+0xa0/0xa0 [ 35.519573] [] ret_from_fork+0x5c/0x70 [ 35.525792] Dumping ftrace buffer: [ 35.529309] (ftrace buffer empty) [ 35.532989] Kernel Offset: disabled [ 35.536587] Rebooting in 86400 seconds..