Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.53' (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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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: [ 35.893510] ================================================================== [ 35.900973] BUG: KASAN: use-after-free in __list_add_valid+0x93/0xa0 [ 35.907540] Read of size 8 at addr ffff88809eaae1d8 by task syz-executor814/15752 [ 35.915139] [ 35.916777] CPU: 1 PID: 15752 Comm: syz-executor814 Not tainted 4.14.281-syzkaller #0 [ 35.924728] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 35.934208] Call Trace: [ 35.936781] dump_stack+0x1b2/0x281 [ 35.940505] print_address_description.cold+0x54/0x1d3 [ 35.945769] kasan_report_error.cold+0x8a/0x191 [ 35.950421] ? __list_add_valid+0x93/0xa0 [ 35.954546] __asan_report_load8_noabort+0x68/0x70 [ 35.959455] ? __list_add_valid+0x93/0xa0 [ 35.963578] __list_add_valid+0x93/0xa0 [ 35.967533] rdma_listen+0x656/0x9b0 [ 35.971223] ucma_listen+0x10b/0x170 [ 35.974912] ? ucma_bind_ip+0x150/0x150 [ 35.978869] ? _copy_from_user+0x96/0x100 [ 35.982996] ? ucma_bind_ip+0x150/0x150 [ 35.986949] ucma_write+0x206/0x2c0 [ 35.990553] ? ucma_set_ib_path+0x510/0x510 [ 35.994854] __vfs_write+0xe4/0x630 [ 35.998725] ? ucma_set_ib_path+0x510/0x510 [ 36.003039] ? kernel_read+0x110/0x110 [ 36.007036] ? common_file_perm+0x3ee/0x580 [ 36.011374] ? security_file_permission+0x82/0x1e0 [ 36.016282] ? rw_verify_area+0xe1/0x2a0 [ 36.020322] vfs_write+0x17f/0x4d0 [ 36.023840] SyS_write+0xf2/0x210 [ 36.027270] ? SyS_read+0x210/0x210 [ 36.030883] ? do_syscall_64+0x4c/0x640 [ 36.034846] ? SyS_read+0x210/0x210 [ 36.038454] do_syscall_64+0x1d5/0x640 [ 36.042324] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 36.047490] RIP: 0033:0x7f2c12535a39 [ 36.051175] RSP: 002b:00007f2c124c6318 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 36.058871] RAX: ffffffffffffffda RBX: 00007f2c125bd418 RCX: 00007f2c12535a39 [ 36.066119] RDX: 0000000000000010 RSI: 00000000200000c0 RDI: 0000000000000003 [ 36.073366] RBP: 00007f2c125bd410 R08: 00007f2c124c6700 R09: 0000000000000000 [ 36.080616] R10: 00007f2c124c6700 R11: 0000000000000246 R12: 006d635f616d6472 [ 36.087869] R13: 00007fffab6e23ff R14: 00007f2c124c6400 R15: 0000000000022000 [ 36.095122] [ 36.096725] Allocated by task 15746: [ 36.100423] kasan_kmalloc+0xeb/0x160 [ 36.104199] kmem_cache_alloc_trace+0x131/0x3d0 [ 36.108841] rdma_create_id+0x57/0x4c0 [ 36.112704] ucma_create_id+0x18b/0x500 [ 36.116655] ucma_write+0x206/0x2c0 [ 36.120258] __vfs_write+0xe4/0x630 [ 36.123858] vfs_write+0x17f/0x4d0 [ 36.127375] SyS_write+0xf2/0x210 [ 36.130822] do_syscall_64+0x1d5/0x640 [ 36.134690] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 36.139856] [ 36.141464] Freed by task 15748: [ 36.144808] kasan_slab_free+0xc3/0x1a0 [ 36.148760] kfree+0xc9/0x250 [ 36.151843] ucma_close+0x11a/0x340 [ 36.155444] __fput+0x25f/0x7a0 [ 36.158699] task_work_run+0x11f/0x190 [ 36.162565] do_exit+0xa44/0x2850 [ 36.166003] do_group_exit+0x100/0x2e0 [ 36.169880] get_signal+0x38d/0x1ca0 [ 36.173577] do_signal+0x7c/0x1550 [ 36.177098] exit_to_usermode_loop+0x160/0x200 [ 36.181662] do_syscall_64+0x4a3/0x640 [ 36.185531] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 36.190704] [ 36.192317] The buggy address belongs to the object at ffff88809eaae000 [ 36.192317] which belongs to the cache kmalloc-1024 of size 1024 [ 36.205135] The buggy address is located 472 bytes inside of [ 36.205135] 1024-byte region [ffff88809eaae000, ffff88809eaae400) [ 36.217083] The buggy address belongs to the page: [ 36.222025] page:ffffea00027aab80 count:1 mapcount:0 mapping:ffff88809eaae000 index:0x0 compound_mapcount: 0 [ 36.231979] flags: 0xfff00000008100(slab|head) [ 36.236542] raw: 00fff00000008100 ffff88809eaae000 0000000000000000 0000000100000007 [ 36.244400] raw: ffffea000251e120 ffffea00027ac8a0 ffff88813fe74ac0 0000000000000000 [ 36.252252] page dumped because: kasan: bad access detected [ 36.257946] [ 36.259689] Memory state around the buggy address: [ 36.264599] ffff88809eaae080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 36.271938] ffff88809eaae100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 36.279623] >ffff88809eaae180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 36.286962] ^ [ 36.293361] ffff88809eaae200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 36.300704] ffff88809eaae280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 36.308041] ================================================================== [ 36.315381] Disabling lock debugging due to kernel taint [ 36.321491] Kernel panic - not syncing: panic_on_warn set ... [ 36.321491] [ 36.328848] CPU: 1 PID: 15752 Comm: syz-executor814 Tainted: G B 4.14.281-syzkaller #0 [ 36.338020] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 36.347360] Call Trace: [ 36.349933] dump_stack+0x1b2/0x281 [ 36.353540] panic+0x1f9/0x42d [ 36.356711] ? add_taint.cold+0x16/0x16 [ 36.360742] ? ___preempt_schedule+0x16/0x18 [ 36.365134] kasan_end_report+0x43/0x49 [ 36.369093] kasan_report_error.cold+0xa7/0x191 [ 36.373739] ? __list_add_valid+0x93/0xa0 [ 36.377861] __asan_report_load8_noabort+0x68/0x70 [ 36.382768] ? __list_add_valid+0x93/0xa0 [ 36.386898] __list_add_valid+0x93/0xa0 [ 36.390850] rdma_listen+0x656/0x9b0 [ 36.394539] ucma_listen+0x10b/0x170 [ 36.398226] ? ucma_bind_ip+0x150/0x150 [ 36.402179] ? _copy_from_user+0x96/0x100 [ 36.406323] ? ucma_bind_ip+0x150/0x150 [ 36.410271] ucma_write+0x206/0x2c0 [ 36.413872] ? ucma_set_ib_path+0x510/0x510 [ 36.418175] __vfs_write+0xe4/0x630 [ 36.421777] ? ucma_set_ib_path+0x510/0x510 [ 36.426071] ? kernel_read+0x110/0x110 [ 36.429936] ? common_file_perm+0x3ee/0x580 [ 36.434243] ? security_file_permission+0x82/0x1e0 [ 36.439148] ? rw_verify_area+0xe1/0x2a0 [ 36.443186] vfs_write+0x17f/0x4d0 [ 36.446704] SyS_write+0xf2/0x210 [ 36.450132] ? SyS_read+0x210/0x210 [ 36.453740] ? do_syscall_64+0x4c/0x640 [ 36.457689] ? SyS_read+0x210/0x210 [ 36.461290] do_syscall_64+0x1d5/0x640 [ 36.465259] entry_SYSCALL_64_after_hwframe+0x46/0xbb [ 36.470423] RIP: 0033:0x7f2c12535a39 [ 36.474236] RSP: 002b:00007f2c124c6318 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 36.481928] RAX: ffffffffffffffda RBX: 00007f2c125bd418 RCX: 00007f2c12535a39 [ 36.489185] RDX: 0000000000000010 RSI: 00000000200000c0 RDI: 0000000000000003 [ 36.496439] RBP: 00007f2c125bd410 R08: 00007f2c124c6700 R09: 0000000000000000 [ 36.503689] R10: 00007f2c124c6700 R11: 0000000000000246 R12: 006d635f616d6472 [ 36.511036] R13: 00007fffab6e23ff R14: 00007f2c124c6400 R15: 0000000000022000 [ 36.518487] Kernel Offset: disabled [ 36.522106] Rebooting in 86400 seconds..