[ 40.499979] audit: type=1800 audit(1550989897.620:30): pid=7892 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:kernel_t:s0 op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 Starting mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 45.810613] kauditd_printk_skb: 4 callbacks suppressed [ 45.810629] audit: type=1400 audit(1550989902.970:35): avc: denied { map } for pid=8066 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.10.32' (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 [ 71.552118] audit: type=1400 audit(1550989928.710:36): avc: denied { map } for pid=8078 comm="syz-executor083" path="/root/syz-executor083334262" dev="sda1" ino=1426 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 74.709470] ================================================================== [ 74.716957] BUG: KASAN: use-after-free in __list_add_valid+0x9a/0xa0 [ 74.723444] Read of size 8 at addr ffff888095fccb20 by task syz-executor083/10269 [ 74.731043] [ 74.732688] CPU: 1 PID: 10269 Comm: syz-executor083 Not tainted 5.0.0-rc7+ #85 [ 74.740065] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 74.749404] Call Trace: [ 74.751980] dump_stack+0x172/0x1f0 [ 74.755592] ? __list_add_valid+0x9a/0xa0 [ 74.759735] print_address_description.cold+0x7c/0x20d [ 74.764996] ? __list_add_valid+0x9a/0xa0 [ 74.769128] ? __list_add_valid+0x9a/0xa0 [ 74.773259] kasan_report.cold+0x1b/0x40 [ 74.777305] ? __list_add_valid+0x9a/0xa0 [ 74.781441] __asan_report_load8_noabort+0x14/0x20 [ 74.786354] __list_add_valid+0x9a/0xa0 [ 74.790314] rdma_listen+0x63b/0x8e0 [ 74.794050] ucma_listen+0x14d/0x1c0 [ 74.797751] ? ucma_notify+0x190/0x190 [ 74.801638] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 74.807172] ? _copy_from_user+0xdd/0x150 [ 74.811304] ucma_write+0x2da/0x3c0 [ 74.814928] ? ucma_notify+0x190/0x190 [ 74.818798] ? ucma_open+0x290/0x290 [ 74.822503] __vfs_write+0x116/0x8e0 [ 74.826210] ? ucma_open+0x290/0x290 [ 74.829936] ? kernel_read+0x120/0x120 [ 74.833809] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 74.839350] ? __inode_security_revalidate+0xda/0x120 [ 74.844538] ? avc_policy_seqno+0xd/0x70 [ 74.848582] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 74.853584] ? selinux_file_permission+0x92/0x550 [ 74.858418] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 74.863943] ? security_file_permission+0x94/0x320 [ 74.868860] ? rw_verify_area+0x118/0x360 [ 74.873002] vfs_write+0x20c/0x580 [ 74.876531] ksys_write+0xea/0x1f0 [ 74.880056] ? __ia32_sys_read+0xb0/0xb0 [ 74.884108] ? do_syscall_64+0x26/0x610 [ 74.888078] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 74.893424] ? do_syscall_64+0x26/0x610 [ 74.897401] __x64_sys_write+0x73/0xb0 [ 74.901281] do_syscall_64+0x103/0x610 [ 74.905167] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 74.910344] RIP: 0033:0x440f59 [ 74.913521] Code: e8 cc ab 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 bb 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 74.932404] RSP: 002b:00007ffca358d798 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 74.940096] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000440f59 [ 74.947354] RDX: 0000000000000010 RSI: 00000000200001c0 RDI: 0000000000000003 [ 74.954618] RBP: 00000000000123b2 R08: 00000000004002c8 R09: 00000000004002c8 [ 74.961868] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000401ea0 [ 74.969135] R13: 0000000000401f30 R14: 0000000000000000 R15: 0000000000000000 [ 74.976393] [ 74.978012] Allocated by task 8083: [ 74.981628] save_stack+0x45/0xd0 [ 74.985066] __kasan_kmalloc.constprop.0+0xcf/0xe0 [ 74.989978] kasan_kmalloc+0x9/0x10 [ 74.993595] kmem_cache_alloc_trace+0x151/0x760 [ 74.998250] __rdma_create_id+0x5f/0x4e0 [ 75.002300] ucma_create_id+0x1de/0x640 [ 75.006258] ucma_write+0x2da/0x3c0 [ 75.009887] __vfs_write+0x116/0x8e0 [ 75.013697] vfs_write+0x20c/0x580 [ 75.017223] ksys_write+0xea/0x1f0 [ 75.020758] __x64_sys_write+0x73/0xb0 [ 75.024665] do_syscall_64+0x103/0x610 [ 75.028539] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 75.033708] [ 75.035356] Freed by task 8083: [ 75.038641] save_stack+0x45/0xd0 [ 75.042097] __kasan_slab_free+0x102/0x150 [ 75.046317] kasan_slab_free+0xe/0x10 [ 75.050119] kfree+0xcf/0x230 [ 75.053213] rdma_destroy_id+0x723/0xab0 [ 75.057261] ucma_close+0x115/0x320 [ 75.060872] __fput+0x2df/0x8d0 [ 75.064141] ____fput+0x16/0x20 [ 75.067404] task_work_run+0x14a/0x1c0 [ 75.071278] exit_to_usermode_loop+0x273/0x2c0 [ 75.075845] do_syscall_64+0x52d/0x610 [ 75.079715] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 75.084884] [ 75.086521] The buggy address belongs to the object at ffff888095fcc940 [ 75.086521] which belongs to the cache kmalloc-2k of size 2048 [ 75.099192] The buggy address is located 480 bytes inside of [ 75.099192] 2048-byte region [ffff888095fcc940, ffff888095fcd140) [ 75.111142] The buggy address belongs to the page: [ 75.116058] page:ffffea000257f300 count:1 mapcount:0 mapping:ffff88812c3f0c40 index:0x0 compound_mapcount: 0 [ 75.126024] flags: 0x1fffc0000010200(slab|head) [ 75.130678] raw: 01fffc0000010200 ffffea0002027b88 ffffea0002565a08 ffff88812c3f0c40 [ 75.138550] raw: 0000000000000000 ffff888095fcc0c0 0000000100000003 0000000000000000 [ 75.146418] page dumped because: kasan: bad access detected [ 75.152104] [ 75.153731] Memory state around the buggy address: [ 75.158644] ffff888095fcca00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 75.165986] ffff888095fcca80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 75.173329] >ffff888095fccb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 75.180667] ^ [ 75.185088] ffff888095fccb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 75.192449] ffff888095fccc00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 75.199790] ================================================================== [ 75.207128] Disabling lock debugging due to kernel taint [ 75.212671] Kernel panic - not syncing: panic_on_warn set ... [ 75.218560] CPU: 1 PID: 10269 Comm: syz-executor083 Tainted: G B 5.0.0-rc7+ #85 [ 75.227291] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 75.236629] Call Trace: [ 75.239207] dump_stack+0x172/0x1f0 [ 75.242826] panic+0x2cb/0x65c [ 75.246005] ? __warn_printk+0xf3/0xf3 [ 75.249879] ? trace_hardirqs_on+0x5e/0x230 [ 75.254211] ? trace_hardirqs_on+0x5e/0x230 [ 75.258520] ? __list_add_valid+0x9a/0xa0 [ 75.262656] end_report+0x47/0x4f [ 75.266100] ? __list_add_valid+0x9a/0xa0 [ 75.270247] kasan_report.cold+0xe/0x40 [ 75.274209] ? __list_add_valid+0x9a/0xa0 [ 75.278345] __asan_report_load8_noabort+0x14/0x20 [ 75.283259] __list_add_valid+0x9a/0xa0 [ 75.287221] rdma_listen+0x63b/0x8e0 [ 75.290923] ucma_listen+0x14d/0x1c0 [ 75.294629] ? ucma_notify+0x190/0x190 [ 75.298508] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 75.304030] ? _copy_from_user+0xdd/0x150 [ 75.308162] ucma_write+0x2da/0x3c0 [ 75.311773] ? ucma_notify+0x190/0x190 [ 75.315661] ? ucma_open+0x290/0x290 [ 75.319364] __vfs_write+0x116/0x8e0 [ 75.323063] ? ucma_open+0x290/0x290 [ 75.326761] ? kernel_read+0x120/0x120 [ 75.330630] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 75.336150] ? __inode_security_revalidate+0xda/0x120 [ 75.341325] ? avc_policy_seqno+0xd/0x70 [ 75.345370] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 75.350391] ? selinux_file_permission+0x92/0x550 [ 75.355236] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 75.360762] ? security_file_permission+0x94/0x320 [ 75.365685] ? rw_verify_area+0x118/0x360 [ 75.369815] vfs_write+0x20c/0x580 [ 75.373338] ksys_write+0xea/0x1f0 [ 75.376876] ? __ia32_sys_read+0xb0/0xb0 [ 75.380920] ? do_syscall_64+0x26/0x610 [ 75.384879] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 75.390241] ? do_syscall_64+0x26/0x610 [ 75.394201] __x64_sys_write+0x73/0xb0 [ 75.398071] do_syscall_64+0x103/0x610 [ 75.401942] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 75.411272] RIP: 0033:0x440f59 [ 75.414448] Code: e8 cc ab 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 bb 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 75.433344] RSP: 002b:00007ffca358d798 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 [ 75.441030] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000440f59 [ 75.448284] RDX: 0000000000000010 RSI: 00000000200001c0 RDI: 0000000000000003 [ 75.455547] RBP: 00000000000123b2 R08: 00000000004002c8 R09: 00000000004002c8 [ 75.462795] R10: 00000000004002c8 R11: 0000000000000246 R12: 0000000000401ea0 [ 75.470045] R13: 0000000000401f30 R14: 0000000000000000 R15: 0000000000000000 [ 75.478286] Kernel Offset: disabled [ 75.481911] Rebooting in 86400 seconds..