[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 12.435930] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.469968] random: sshd: uninitialized urandom read (32 bytes read) [ 22.688815] random: sshd: uninitialized urandom read (32 bytes read) [ 23.181450] random: sshd: uninitialized urandom read (32 bytes read) [ 44.487619] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.38' (ECDSA) to the list of known hosts. [ 50.158341] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 50.265619] IPVS: Creating netns size=2536 id=1 executing program executing program [ 50.288180] IPVS: Creating netns size=2536 id=2 executing program [ 50.310400] IPVS: Creating netns size=2536 id=3 executing program [ 50.334543] IPVS: Creating netns size=2536 id=4 executing program executing program [ 50.358286] IPVS: Creating netns size=2536 id=5 executing program executing program executing program [ 50.383245] IPVS: Creating netns size=2536 id=6 executing program [ 50.410125] IPVS: Creating netns size=2536 id=7 executing program executing program executing program [ 50.433783] IPVS: Creating netns size=2536 id=8 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 70.326703] ================================================================== [ 70.334112] BUG: KASAN: use-after-free in cpuacct_charge+0x328/0x360 [ 70.340589] Read of size 8 at addr ffff8801c45042e0 by task syz-executor156/3816 [ 70.348104] [ 70.349722] CPU: 0 PID: 3816 Comm: syz-executor156 Not tainted 4.9.122-g54068d6 #78 [ 70.357495] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 70.366836] ffff8801d91b7a08 ffffffff81eb8829 ffffea0007114100 ffff8801c45042e0 [ 70.374877] 0000000000000000 ffff8801c45042e0 0000000000000000 ffff8801d91b7a40 [ 70.382906] ffffffff8156b6be ffff8801c45042e0 0000000000000008 0000000000000000 [ 70.390933] Call Trace: [ 70.393506] [] dump_stack+0xc1/0x128 [ 70.398873] [] print_address_description+0x6c/0x234 [ 70.405526] [] kasan_report.cold.6+0x242/0x2fe [ 70.411742] [] ? cpuacct_charge+0x328/0x360 [ 70.417740] [] __asan_report_load8_noabort+0x14/0x20 [ 70.424482] [] cpuacct_charge+0x328/0x360 [ 70.430277] [] ? cpuacct_charge+0x7c/0x360 [ 70.436150] [] update_curr+0x28b/0x680 [ 70.441671] [] dequeue_task_fair+0xe3/0x1000 [ 70.447716] [] ? __lock_is_held+0xa2/0xf0 [ 70.453499] [] deactivate_task+0xfb/0x2e0 [ 70.459290] [] __schedule+0x981/0x1bd0 [ 70.464814] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 70.471724] [] schedule+0x7f/0x1b0 [ 70.476897] [] do_nanosleep+0x1f5/0x4d0 [ 70.482507] [] ? schedule_timeout_idle+0x90/0x90 [ 70.488901] [] ? memset+0x31/0x40 [ 70.493989] [] hrtimer_nanosleep+0x210/0x540 [ 70.500029] [] ? hrtimer_run_queues+0x1c0/0x1c0 [ 70.506330] [] ? enqueue_hrtimer+0x3a0/0x3a0 [ 70.512372] [] ? do_nanosleep+0x197/0x4d0 [ 70.518156] [] SyS_nanosleep+0xcc/0x120 [ 70.523772] [] ? hrtimer_nanosleep+0x540/0x540 [ 70.529989] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 70.536815] [] ? hrtimer_nanosleep+0x540/0x540 [ 70.543034] [] do_syscall_64+0x1a6/0x490 [ 70.548732] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 70.555639] [ 70.557253] Allocated by task 6358: [ 70.560871] save_stack_trace+0x16/0x20 [ 70.564831] save_stack+0x43/0xd0 [ 70.568264] kasan_kmalloc+0xc7/0xe0 [ 70.571969] kmem_cache_alloc_trace+0xfd/0x2b0 [ 70.576533] cgroup_migrate_prepare_dst+0x779/0x1810 [ 70.581618] cgroup_apply_control+0x35f/0x650 [ 70.586100] cgroup_subtree_control_write+0x9d2/0xf40 [ 70.591279] cgroup_file_write+0x10d/0x550 [ 70.595497] kernfs_fop_write+0x2ae/0x460 [ 70.600058] __vfs_write+0x115/0x580 [ 70.603749] vfs_write+0x187/0x530 [ 70.607262] SyS_write+0xd9/0x1c0 [ 70.610697] do_syscall_64+0x1a6/0x490 [ 70.614558] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 70.619686] [ 70.621298] Freed by task 0: [ 70.624301] save_stack_trace+0x16/0x20 [ 70.628262] save_stack+0x43/0xd0 [ 70.631707] kasan_slab_free+0x72/0xc0 [ 70.635578] kfree+0xfb/0x310 [ 70.638674] rcu_process_callbacks+0x9d5/0x12b0 [ 70.643335] __do_softirq+0x210/0x940 [ 70.647118] [ 70.648736] The buggy address belongs to the object at ffff8801c4504280 [ 70.648736] which belongs to the cache kmalloc-512 of size 512 [ 70.661398] The buggy address is located 96 bytes inside of [ 70.661398] 512-byte region [ffff8801c4504280, ffff8801c4504480) [ 70.673170] The buggy address belongs to the page: [ 70.678087] page:ffffea0007114100 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0 [ 70.688297] flags: 0x8000000000004080(slab|head) [ 70.693032] page dumped because: kasan: bad access detected [ 70.698721] [ 70.700331] Memory state around the buggy address: [ 70.705246] ffff8801c4504180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 70.712592] ffff8801c4504200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 70.719937] >ffff8801c4504280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 70.727284] ^ [ 70.733765] ffff8801c4504300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 70.741115] ffff8801c4504380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 70.748462] ================================================================== [ 70.755804] Disabling lock debugging due to kernel taint [ 70.761235] Kernel panic - not syncing: panic_on_warn set ... [ 70.761235] [ 70.768583] CPU: 0 PID: 3816 Comm: syz-executor156 Tainted: G B 4.9.122-g54068d6 #78 [ 70.777576] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 70.786917] ffff8801d91b7968 ffffffff81eb8829 ffffffff843c81db 00000000ffffffff [ 70.794973] 0000000000000000 0000000000000000 0000000000000000 ffff8801d91b7a28 [ 70.803000] ffffffff81423f35 0000000041b58ab3 ffffffff843bb838 ffffffff81423d76 [ 70.811028] Call Trace: [ 70.813615] [] dump_stack+0xc1/0x128 [ 70.818964] [] panic+0x1bf/0x3bc [ 70.823964] [] ? add_taint.cold.6+0x16/0x16 [ 70.829921] [] ? kasan_end_report+0x32/0x4f [ 70.835878] [] kasan_end_report+0x47/0x4f [ 70.841660] [] kasan_report.cold.6+0x76/0x2fe [ 70.847796] [] ? cpuacct_charge+0x328/0x360 [ 70.853763] [] __asan_report_load8_noabort+0x14/0x20 [ 70.860502] [] cpuacct_charge+0x328/0x360 [ 70.866375] [] ? cpuacct_charge+0x7c/0x360 [ 70.872248] [] update_curr+0x28b/0x680 [ 70.877779] [] dequeue_task_fair+0xe3/0x1000 [ 70.883824] [] ? __lock_is_held+0xa2/0xf0 [ 70.889611] [] deactivate_task+0xfb/0x2e0 [ 70.895396] [] __schedule+0x981/0x1bd0 [ 70.900920] [] ? _raw_spin_unlock_irqrestore+0x5a/0x70 [ 70.907831] [] schedule+0x7f/0x1b0 [ 70.913010] [] do_nanosleep+0x1f5/0x4d0 [ 70.918621] [] ? schedule_timeout_idle+0x90/0x90 [ 70.925011] [] ? memset+0x31/0x40 [ 70.930098] [] hrtimer_nanosleep+0x210/0x540 [ 70.936139] [] ? hrtimer_run_queues+0x1c0/0x1c0 [ 70.942444] [] ? enqueue_hrtimer+0x3a0/0x3a0 [ 70.948486] [] ? do_nanosleep+0x197/0x4d0 [ 70.954268] [] SyS_nanosleep+0xcc/0x120 [ 70.959889] [] ? hrtimer_nanosleep+0x540/0x540 [ 70.966108] [] ? trace_hardirqs_on_caller+0x38b/0x590 [ 70.972932] [] ? hrtimer_nanosleep+0x540/0x540 [ 70.979152] [] do_syscall_64+0x1a6/0x490 [ 70.984853] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 72.115731] Shutting down cpus with NMI [ 72.120041] Dumping ftrace buffer: [ 72.123564] (ftrace buffer empty) [ 72.127252] Kernel Offset: disabled [ 72.130857] Rebooting in 86400 seconds..