[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.34' (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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 51.686828] ================================================================== [ 51.694368] BUG: KASAN: use-after-free in __list_del_entry_valid+0xd6/0xef [ 51.701376] Read of size 8 at addr ffff888091a6d3e0 by task syz-executor194/9051 [ 51.708923] [ 51.711442] CPU: 1 PID: 9051 Comm: syz-executor194 Not tainted 4.14.175-syzkaller #0 [ 51.719318] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.729352] Call Trace: [ 51.731938] dump_stack+0x13e/0x194 [ 51.735557] ? __list_del_entry_valid+0xd6/0xef [ 51.740214] print_address_description.cold+0x7c/0x1e2 [ 51.745478] ? __list_del_entry_valid+0xd6/0xef [ 51.750184] kasan_report.cold+0xa9/0x2ae [ 51.754352] __list_del_entry_valid+0xd6/0xef [ 51.758835] cma_cancel_operation+0x280/0x940 [ 51.763317] rdma_destroy_id+0x8b/0xb50 [ 51.767316] ? trace_hardirqs_on_caller+0x3f6/0x590 [ 51.772333] ucma_close+0x105/0x300 [ 51.775948] ? ima_file_free+0x4f/0x330 [ 51.779934] ? ucma_free_ctx+0xa00/0xa00 [ 51.784025] __fput+0x25f/0x790 [ 51.787307] task_work_run+0x113/0x190 [ 51.791290] do_exit+0x9f2/0x2b00 [ 51.794737] ? mm_update_next_owner+0x5b0/0x5b0 [ 51.799390] ? get_signal+0x31c/0x1ca0 [ 51.803292] ? lock_downgrade+0x6e0/0x6e0 [ 51.807432] do_group_exit+0x100/0x310 [ 51.811308] get_signal+0x385/0x1ca0 [ 51.815120] ? ucma_write+0xf9/0x2c0 [ 51.818847] ? ucma_open+0x280/0x280 [ 51.822651] do_signal+0x7c/0x1690 [ 51.826181] ? fsnotify+0x897/0x1110 [ 51.829883] ? __vfs_write+0xec/0x630 [ 51.833738] ? ucma_open+0x280/0x280 [ 51.837457] ? setup_sigcontext+0x820/0x820 [ 51.841775] ? __fsnotify_update_child_dentry_flags.part.0+0x2e0/0x2e0 [ 51.848605] ? fsnotify+0x1110/0x1110 [ 51.852432] ? security_file_permission+0x82/0x1e0 [ 51.858045] ? SyS_futex+0x1e8/0x2c0 [ 51.861921] ? SyS_futex+0x1f2/0x2c0 [ 51.865628] ? fput+0xb/0x140 [ 51.868723] ? exit_to_usermode_loop+0x41/0x220 [ 51.873404] exit_to_usermode_loop+0x159/0x220 [ 51.877989] do_syscall_64+0x4a3/0x640 [ 51.881867] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 51.887057] RIP: 0033:0x4469d9 [ 51.890235] RSP: 002b:00007fec14272d08 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 51.897927] RAX: fffffffffffffe00 RBX: 00000000006dbc48 RCX: 00000000004469d9 [ 51.905213] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc48 [ 51.912557] RBP: 00000000006dbc40 R08: 0000000000000000 R09: 0000000000000000 [ 51.919813] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc4c [ 51.927190] R13: 00007fec14272d10 R14: 00007fec14272d10 R15: 0000000000000000 [ 51.934462] [ 51.936078] Allocated by task 9051: [ 51.939694] save_stack+0x32/0xa0 [ 51.943255] kasan_kmalloc+0xbf/0xe0 [ 51.947012] kmem_cache_alloc_trace+0x14d/0x7b0 [ 51.951729] rdma_create_id+0x57/0x4c0 [ 51.955619] ucma_create_id+0x18b/0x500 [ 51.959588] ucma_write+0x206/0x2c0 [ 51.963216] __vfs_write+0xe4/0x630 [ 51.966849] vfs_write+0x192/0x4e0 [ 51.970474] SyS_write+0xf2/0x210 [ 51.974011] do_syscall_64+0x1d5/0x640 [ 51.978013] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 51.983203] [ 51.984837] Freed by task 9051: [ 51.988115] save_stack+0x32/0xa0 [ 51.991548] kasan_slab_free+0x75/0xc0 [ 51.995429] kfree+0xcb/0x260 [ 51.998525] ucma_close+0x105/0x300 [ 52.002136] __fput+0x25f/0x790 [ 52.005398] task_work_run+0x113/0x190 [ 52.009271] do_exit+0x9f2/0x2b00 [ 52.012716] do_group_exit+0x100/0x310 [ 52.016590] get_signal+0x385/0x1ca0 [ 52.020288] do_signal+0x7c/0x1690 [ 52.023816] exit_to_usermode_loop+0x159/0x220 [ 52.028399] do_syscall_64+0x4a3/0x640 [ 52.032352] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 52.037975] [ 52.039596] The buggy address belongs to the object at ffff888091a6d200 [ 52.039596] which belongs to the cache kmalloc-1024 of size 1024 [ 52.052941] The buggy address is located 480 bytes inside of [ 52.052941] 1024-byte region [ffff888091a6d200, ffff888091a6d600) [ 52.065457] The buggy address belongs to the page: [ 52.070526] page:ffffea0002469b00 count:1 mapcount:0 mapping:ffff888091a6c000 index:0x0 compound_mapcount: 0 [ 52.080918] flags: 0xfffe0000008100(slab|head) [ 52.085506] raw: 00fffe0000008100 ffff888091a6c000 0000000000000000 0000000100000007 [ 52.093380] raw: ffffea0002446e20 ffff88812fe54848 ffff88812fe56ac0 0000000000000000 [ 52.101331] page dumped because: kasan: bad access detected [ 52.107022] [ 52.108629] Memory state around the buggy address: [ 52.113539] ffff888091a6d280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 52.120879] ffff888091a6d300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 52.128261] >ffff888091a6d380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 52.135609] ^ [ 52.142262] ffff888091a6d400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 52.149619] ffff888091a6d480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 52.156970] ================================================================== [ 52.164311] Disabling lock debugging due to kernel taint [ 52.171491] Kernel panic - not syncing: panic_on_warn set ... [ 52.171491] [ 52.178877] CPU: 1 PID: 9051 Comm: syz-executor194 Tainted: G B 4.14.175-syzkaller #0 [ 52.187974] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.197416] Call Trace: [ 52.200005] dump_stack+0x13e/0x194 [ 52.203636] panic+0x1f9/0x42d [ 52.206903] ? add_taint.cold+0x16/0x16 [ 52.210861] ? preempt_schedule_common+0x4a/0xc0 [ 52.215597] ? __list_del_entry_valid+0xd6/0xef [ 52.220260] ? ___preempt_schedule+0x16/0x18 [ 52.224660] ? __list_del_entry_valid+0xd6/0xef [ 52.229354] kasan_end_report+0x43/0x49 [ 52.233324] kasan_report.cold+0x12f/0x2ae [ 52.237543] __list_del_entry_valid+0xd6/0xef [ 52.242046] cma_cancel_operation+0x280/0x940 [ 52.246527] rdma_destroy_id+0x8b/0xb50 [ 52.250498] ? trace_hardirqs_on_caller+0x3f6/0x590 [ 52.255555] ucma_close+0x105/0x300 [ 52.259185] ? ima_file_free+0x4f/0x330 [ 52.263142] ? ucma_free_ctx+0xa00/0xa00 [ 52.267200] __fput+0x25f/0x790 [ 52.270589] task_work_run+0x113/0x190 [ 52.274488] do_exit+0x9f2/0x2b00 [ 52.277924] ? mm_update_next_owner+0x5b0/0x5b0 [ 52.282584] ? get_signal+0x31c/0x1ca0 [ 52.286488] ? lock_downgrade+0x6e0/0x6e0 [ 52.290620] do_group_exit+0x100/0x310 [ 52.294504] get_signal+0x385/0x1ca0 [ 52.298355] ? ucma_write+0xf9/0x2c0 [ 52.302074] ? ucma_open+0x280/0x280 [ 52.305792] do_signal+0x7c/0x1690 [ 52.309327] ? fsnotify+0x897/0x1110 [ 52.313044] ? __vfs_write+0xec/0x630 [ 52.316830] ? ucma_open+0x280/0x280 [ 52.320532] ? setup_sigcontext+0x820/0x820 [ 52.324847] ? __fsnotify_update_child_dentry_flags.part.0+0x2e0/0x2e0 [ 52.331503] ? fsnotify+0x1110/0x1110 [ 52.335291] ? security_file_permission+0x82/0x1e0 [ 52.340220] ? SyS_futex+0x1e8/0x2c0 [ 52.343916] ? SyS_futex+0x1f2/0x2c0 [ 52.347621] ? fput+0xb/0x140 [ 52.350723] ? exit_to_usermode_loop+0x41/0x220 [ 52.355373] exit_to_usermode_loop+0x159/0x220 [ 52.359937] do_syscall_64+0x4a3/0x640 [ 52.363811] entry_SYSCALL_64_after_hwframe+0x42/0xb7 [ 52.368980] RIP: 0033:0x4469d9 [ 52.372166] RSP: 002b:00007fec14272d08 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca [ 52.379857] RAX: fffffffffffffe00 RBX: 00000000006dbc48 RCX: 00000000004469d9 [ 52.387220] RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00000000006dbc48 [ 52.394474] RBP: 00000000006dbc40 R08: 0000000000000000 R09: 0000000000000000 [ 52.402033] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006dbc4c [ 52.409302] R13: 00007fec14272d10 R14: 00007fec14272d10 R15: 0000000000000000 [ 52.418018] Kernel Offset: disabled [ 52.421766] Rebooting in 86400 seconds..