[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 15.017250] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.916104] random: sshd: uninitialized urandom read (32 bytes read) [ 19.191482] random: sshd: uninitialized urandom read (32 bytes read) [ 19.895590] random: sshd: uninitialized urandom read (32 bytes read) [ 48.432468] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.37' (ECDSA) to the list of known hosts. [ 53.880848] random: sshd: uninitialized urandom read (32 bytes read) executing program [ 53.968798] IPVS: ftp: loaded support on port[0] = 21 [ 53.996575] ================================================================== [ 54.004025] BUG: KASAN: slab-out-of-bounds in find_first_bit+0xf7/0x100 [ 54.010776] Read of size 8 at addr ffff8801d7240ad0 by task syz-executor953/4459 [ 54.018286] [ 54.019899] CPU: 0 PID: 4459 Comm: syz-executor953 Not tainted 4.18.0-rc3-next-20180706+ #1 [ 54.028393] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.037728] Call Trace: [ 54.040316] dump_stack+0x1c9/0x2b4 [ 54.043928] ? dump_stack_print_info.cold.2+0x52/0x52 [ 54.049101] ? printk+0xa7/0xcf [ 54.052374] ? kmsg_dump_rewind_nolock+0xe4/0xe4 [ 54.057117] ? find_first_bit+0xf7/0x100 [ 54.061169] print_address_description+0x6c/0x20b [ 54.065994] ? find_first_bit+0xf7/0x100 [ 54.070036] kasan_report.cold.7+0x242/0x30d [ 54.074446] __asan_report_load8_noabort+0x14/0x20 [ 54.079386] find_first_bit+0xf7/0x100 [ 54.083258] shrink_slab+0x5d0/0xdb0 [ 54.086957] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 54.092481] ? unregister_memcg_shrinker.isra.39+0x50/0x50 [ 54.098092] ? shrink_active_list+0x1830/0x1830 [ 54.102761] ? page_add_new_anon_rmap+0x870/0x870 [ 54.107591] ? save_stack+0xa9/0xd0 [ 54.111207] ? save_stack+0x43/0xd0 [ 54.114833] ? kernfs_fop_open+0xa7f/0x1020 [ 54.119140] ? do_dentry_open+0xa7d/0x11c0 [ 54.123375] ? trace_hardirqs_on+0x10/0x10 [ 54.127612] shrink_node+0x429/0x16a0 [ 54.131416] ? shrink_node_memcg+0x18f0/0x18f0 [ 54.135987] ? kvm_clock_read+0x25/0x30 [ 54.139963] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 54.144970] ? ktime_get_raw_ts64+0x4f0/0x4f0 [ 54.149450] ? xa_set_tag+0x40/0x40 [ 54.153065] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 54.158068] do_try_to_free_pages+0x3e7/0x1290 [ 54.162644] ? shrink_node+0x16a0/0x16a0 [ 54.166693] ? check_same_owner+0x340/0x340 [ 54.170998] ? trace_hardirqs_on+0x10/0x10 [ 54.175239] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 54.180764] ? _parse_integer+0x13b/0x190 [ 54.184903] try_to_free_mem_cgroup_pages+0x49d/0xc90 [ 54.190082] ? pointer_string+0x1b0/0x1b0 [ 54.194221] ? try_to_free_pages+0xb80/0xb80 [ 54.198622] ? memparse+0x171/0x1d0 [ 54.202249] ? get_options+0x380/0x380 [ 54.206126] ? kasan_kmalloc+0xc4/0xe0 [ 54.210022] ? __kmalloc+0x14e/0x760 [ 54.213726] ? kernfs_fop_write+0x33d/0x480 [ 54.218039] ? __vfs_write+0x117/0x9f0 [ 54.221914] ? vfs_write+0x1fc/0x560 [ 54.225614] ? ksys_write+0x101/0x260 [ 54.229422] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 54.234955] ? page_counter_memparse+0xb5/0x1e0 [ 54.239637] ? page_counter_set_low+0x180/0x180 [ 54.244298] ? cgroup_control+0x180/0x180 [ 54.248448] memory_high_write+0x283/0x310 [ 54.252679] ? mem_cgroup_css_released+0x140/0x140 [ 54.257600] ? lock_acquire+0x1e4/0x540 [ 54.261566] ? __might_fault+0x12b/0x1e0 [ 54.265617] cgroup_file_write+0x31f/0x840 [ 54.269837] ? mem_cgroup_css_released+0x140/0x140 [ 54.274752] ? cgroup_migrate_add_task+0xcd0/0xcd0 [ 54.279682] ? cgroup_migrate_add_task+0xcd0/0xcd0 [ 54.284596] kernfs_fop_write+0x2ba/0x480 [ 54.288729] __vfs_write+0x117/0x9f0 [ 54.292426] ? kernfs_fop_open+0x1020/0x1020 [ 54.296837] ? kernel_read+0x120/0x120 [ 54.300718] ? lock_release+0xa30/0xa30 [ 54.304674] ? check_same_owner+0x340/0x340 [ 54.309086] ? rcu_note_context_switch+0x730/0x730 [ 54.314009] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 54.319532] ? __sb_start_write+0x17f/0x300 [ 54.323846] vfs_write+0x1fc/0x560 [ 54.327385] ksys_write+0x101/0x260 [ 54.330997] ? __ia32_sys_read+0xb0/0xb0 [ 54.335046] __x64_sys_write+0x73/0xb0 [ 54.338918] do_syscall_64+0x1b9/0x820 [ 54.342793] ? syscall_return_slowpath+0x5e0/0x5e0 [ 54.347718] ? syscall_return_slowpath+0x31d/0x5e0 [ 54.352632] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 54.357650] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 54.363188] ? prepare_exit_to_usermode+0x291/0x3b0 [ 54.368199] ? perf_trace_sys_enter+0xb10/0xb10 [ 54.372854] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 54.377685] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 54.382870] RIP: 0033:0x441a29 [ 54.386043] Code: e8 ec b5 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 54.405172] RSP: 002b:00007fff65fadf68 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 54.412877] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441a29 [ 54.420151] RDX: 0000000000000001 RSI: 0000000020000000 RDI: 0000000000000004 [ 54.427406] RBP: 0000000000000000 R08: 0000000000000012 R09: 0000000000000006 [ 54.434667] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 [ 54.441923] R13: 6c616b7a79732f2e R14: 0000000000000000 R15: 0000000000000000 [ 54.449192] [ 54.450803] Allocated by task 4458: [ 54.454432] save_stack+0x43/0xd0 [ 54.457865] kasan_kmalloc+0xc4/0xe0 [ 54.461560] __kmalloc_node+0x47/0x70 [ 54.465342] kvmalloc_node+0x65/0xf0 [ 54.469057] mem_cgroup_css_online+0x169/0x3c0 [ 54.473640] online_css+0x10c/0x350 [ 54.477275] cgroup_apply_control_enable+0x777/0xe90 [ 54.482384] cgroup_mkdir+0x88a/0x1170 [ 54.486270] kernfs_iop_mkdir+0x159/0x1e0 [ 54.490400] vfs_mkdir+0x42e/0x6b0 [ 54.494011] do_mkdirat+0x27b/0x310 [ 54.497624] __x64_sys_mkdir+0x5c/0x80 [ 54.501494] do_syscall_64+0x1b9/0x820 [ 54.505375] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 54.510540] [ 54.512146] Freed by task 1: [ 54.515151] save_stack+0x43/0xd0 [ 54.518586] __kasan_slab_free+0x11a/0x170 [ 54.522810] kasan_slab_free+0xe/0x10 [ 54.526590] kfree+0xd9/0x260 [ 54.529690] acpi_ex_start_trace_method+0x133/0x335 [ 54.534712] acpi_ds_begin_method_execution+0x45/0x7ff [ 54.539972] acpi_ds_call_control_method+0x80/0x49f [ 54.544979] acpi_ps_parse_aml+0x245/0x86a [ 54.549201] acpi_ps_execute_method+0x521/0x597 [ 54.553852] acpi_ns_evaluate+0x717/0x9bc [ 54.557980] acpi_evaluate_object+0x48c/0x8cf [ 54.562466] acpi_evaluate_integer+0x129/0x280 [ 54.567045] acpi_bus_get_status_handle+0x26/0xa0 [ 54.571886] acpi_bus_check_add+0x3b5/0xb60 [ 54.576193] acpi_ns_walk_namespace+0x224/0x400 [ 54.580857] acpi_walk_namespace+0xf2/0x12c [ 54.585176] acpi_bus_scan+0x146/0x170 [ 54.589072] acpi_scan_init+0x403/0x8fe [ 54.593031] acpi_init+0x941/0xa19 [ 54.596575] do_one_initcall+0x127/0x913 [ 54.600629] kernel_init_freeable+0x49b/0x58e [ 54.605117] kernel_init+0x11/0x1b3 [ 54.608743] ret_from_fork+0x3a/0x50 [ 54.612435] [ 54.614067] The buggy address belongs to the object at ffff8801d7240ac0 [ 54.614067] which belongs to the cache kmalloc-32 of size 32 [ 54.626555] The buggy address is located 16 bytes inside of [ 54.626555] 32-byte region [ffff8801d7240ac0, ffff8801d7240ae0) [ 54.638250] The buggy address belongs to the page: [ 54.643175] page:ffffea00075c9000 count:1 mapcount:0 mapping:ffff8801da8001c0 index:0xffff8801d7240fc1 [ 54.652631] flags: 0x2fffc0000000100(slab) [ 54.656856] raw: 02fffc0000000100 ffffea00075c8ec8 ffffea00075c9108 ffff8801da8001c0 [ 54.664734] raw: ffff8801d7240fc1 ffff8801d7240000 000000010000003f 0000000000000000 [ 54.672597] page dumped because: kasan: bad access detected [ 54.678315] [ 54.679924] Memory state around the buggy address: [ 54.684874] ffff8801d7240980: 00 03 fc fc fc fc fc fc 00 00 00 fc fc fc fc fc [ 54.692221] ffff8801d7240a00: 00 03 fc fc fc fc fc fc 00 03 fc fc fc fc fc fc [ 54.699564] >ffff8801d7240a80: 00 07 fc fc fc fc fc fc 00 00 05 fc fc fc fc fc [ 54.706915] ^ [ 54.712866] ffff8801d7240b00: 00 00 00 fc fc fc fc fc 00 00 00 fc fc fc fc fc [ 54.720208] ffff8801d7240b80: 00 04 fc fc fc fc fc fc 00 00 00 fc fc fc fc fc [ 54.727558] ================================================================== [ 54.734999] Kernel panic - not syncing: panic_on_warn set ... [ 54.734999] [ 54.742366] CPU: 0 PID: 4459 Comm: syz-executor953 Tainted: G B 4.18.0-rc3-next-20180706+ #1 [ 54.752234] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.761573] Call Trace: [ 54.764160] dump_stack+0x1c9/0x2b4 [ 54.767770] ? dump_stack_print_info.cold.2+0x52/0x52 [ 54.773040] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 54.777797] panic+0x238/0x4e7 [ 54.780974] ? add_taint.cold.5+0x16/0x16 [ 54.785111] ? do_raw_spin_unlock+0xa7/0x2f0 [ 54.789518] ? find_first_bit+0xf7/0x100 [ 54.793562] kasan_end_report+0x47/0x4f [ 54.797517] kasan_report.cold.7+0x76/0x30d [ 54.801821] __asan_report_load8_noabort+0x14/0x20 [ 54.806746] find_first_bit+0xf7/0x100 [ 54.810646] shrink_slab+0x5d0/0xdb0 [ 54.814349] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 54.819891] ? unregister_memcg_shrinker.isra.39+0x50/0x50 [ 54.825507] ? shrink_active_list+0x1830/0x1830 [ 54.830178] ? page_add_new_anon_rmap+0x870/0x870 [ 54.835009] ? save_stack+0xa9/0xd0 [ 54.838626] ? save_stack+0x43/0xd0 [ 54.842249] ? kernfs_fop_open+0xa7f/0x1020 [ 54.846557] ? do_dentry_open+0xa7d/0x11c0 [ 54.850798] ? trace_hardirqs_on+0x10/0x10 [ 54.855049] shrink_node+0x429/0x16a0 [ 54.858846] ? shrink_node_memcg+0x18f0/0x18f0 [ 54.863416] ? kvm_clock_read+0x25/0x30 [ 54.867382] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 54.872390] ? ktime_get_raw_ts64+0x4f0/0x4f0 [ 54.876876] ? xa_set_tag+0x40/0x40 [ 54.880509] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 54.885529] do_try_to_free_pages+0x3e7/0x1290 [ 54.890113] ? shrink_node+0x16a0/0x16a0 [ 54.894183] ? check_same_owner+0x340/0x340 [ 54.898498] ? trace_hardirqs_on+0x10/0x10 [ 54.902733] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 54.908269] ? _parse_integer+0x13b/0x190 [ 54.912409] try_to_free_mem_cgroup_pages+0x49d/0xc90 [ 54.917586] ? pointer_string+0x1b0/0x1b0 [ 54.921728] ? try_to_free_pages+0xb80/0xb80 [ 54.926125] ? memparse+0x171/0x1d0 [ 54.929752] ? get_options+0x380/0x380 [ 54.933620] ? kasan_kmalloc+0xc4/0xe0 [ 54.937491] ? __kmalloc+0x14e/0x760 [ 54.941197] ? kernfs_fop_write+0x33d/0x480 [ 54.945500] ? __vfs_write+0x117/0x9f0 [ 54.949372] ? vfs_write+0x1fc/0x560 [ 54.953074] ? ksys_write+0x101/0x260 [ 54.956878] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 54.962418] ? page_counter_memparse+0xb5/0x1e0 [ 54.967083] ? page_counter_set_low+0x180/0x180 [ 54.971739] ? cgroup_control+0x180/0x180 [ 54.975877] memory_high_write+0x283/0x310 [ 54.980101] ? mem_cgroup_css_released+0x140/0x140 [ 54.985015] ? lock_acquire+0x1e4/0x540 [ 54.988974] ? __might_fault+0x12b/0x1e0 [ 54.993023] cgroup_file_write+0x31f/0x840 [ 54.997249] ? mem_cgroup_css_released+0x140/0x140 [ 55.002164] ? cgroup_migrate_add_task+0xcd0/0xcd0 [ 55.007081] ? cgroup_migrate_add_task+0xcd0/0xcd0 [ 55.011997] kernfs_fop_write+0x2ba/0x480 [ 55.016139] __vfs_write+0x117/0x9f0 [ 55.019840] ? kernfs_fop_open+0x1020/0x1020 [ 55.024247] ? kernel_read+0x120/0x120 [ 55.028144] ? lock_release+0xa30/0xa30 [ 55.032100] ? check_same_owner+0x340/0x340 [ 55.036411] ? rcu_note_context_switch+0x730/0x730 [ 55.041328] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 55.046850] ? __sb_start_write+0x17f/0x300 [ 55.051167] vfs_write+0x1fc/0x560 [ 55.054689] ksys_write+0x101/0x260 [ 55.058301] ? __ia32_sys_read+0xb0/0xb0 [ 55.062362] __x64_sys_write+0x73/0xb0 [ 55.066326] do_syscall_64+0x1b9/0x820 [ 55.070202] ? syscall_return_slowpath+0x5e0/0x5e0 [ 55.075117] ? syscall_return_slowpath+0x31d/0x5e0 [ 55.080049] ? prepare_exit_to_usermode+0x3b0/0x3b0 [ 55.085057] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 55.090582] ? prepare_exit_to_usermode+0x291/0x3b0 [ 55.095673] ? perf_trace_sys_enter+0xb10/0xb10 [ 55.100328] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 55.105158] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 55.110333] RIP: 0033:0x441a29 [ 55.113506] Code: e8 ec b5 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b 08 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 55.132633] RSP: 002b:00007fff65fadf68 EFLAGS: 00000202 ORIG_RAX: 0000000000000001 [ 55.140326] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441a29 [ 55.147576] RDX: 0000000000000001 RSI: 0000000020000000 RDI: 0000000000000004 [ 55.154841] RBP: 0000000000000000 R08: 0000000000000012 R09: 0000000000000006 [ 55.162108] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000 [ 55.169367] R13: 6c616b7a79732f2e R14: 0000000000000000 R15: 0000000000000000 [ 55.177034] Dumping ftrace buffer: [ 55.180562] (ftrace buffer empty) [ 55.184257] Kernel Offset: disabled [ 55.187864] Rebooting in 86400 seconds..