[ 59.759913][ T25] audit: type=1800 audit(1575836896.354:25): pid=8790 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2414 res=0 [ 59.781132][ T25] audit: type=1800 audit(1575836896.354:26): pid=8790 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2457 res=0 [ 59.835846][ T25] audit: type=1800 audit(1575836896.354:27): pid=8790 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [ 60.329805][ T8855] sshd (8855) used greatest stack depth: 22888 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.23' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 69.617566][ T8942] ================================================================== [ 69.625916][ T8942] BUG: KASAN: null-ptr-deref in llcp_sock_getname+0x358/0x460 [ 69.633407][ T8942] Read of size 43 at addr 0000000000000000 by task syz-executor466/8942 [ 69.641705][ T8942] [ 69.644029][ T8942] CPU: 0 PID: 8942 Comm: syz-executor466 Not tainted 5.4.0-syzkaller #0 [ 69.652514][ T8942] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.662632][ T8942] Call Trace: [ 69.665922][ T8942] dump_stack+0x197/0x210 [ 69.670240][ T8942] ? llcp_sock_getname+0x358/0x460 [ 69.675339][ T8942] ? llcp_sock_getname+0x358/0x460 [ 69.680434][ T8942] __kasan_report.cold+0x5/0x41 [ 69.685272][ T8942] ? llcp_sock_getname+0x358/0x460 [ 69.690382][ T8942] kasan_report+0x12/0x20 [ 69.694693][ T8942] check_memory_region+0x134/0x1a0 [ 69.699791][ T8942] memcpy+0x24/0x50 [ 69.703586][ T8942] llcp_sock_getname+0x358/0x460 [ 69.708509][ T8942] __sys_getpeername+0x12b/0x290 [ 69.713430][ T8942] ? __ia32_sys_getsockname+0xb0/0xb0 [ 69.718790][ T8942] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 69.724233][ T8942] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 69.729683][ T8942] ? do_syscall_64+0x26/0x790 [ 69.734357][ T8942] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 69.740422][ T8942] ? do_syscall_64+0x26/0x790 [ 69.745097][ T8942] __x64_sys_getpeername+0x73/0xb0 [ 69.750203][ T8942] do_syscall_64+0xfa/0x790 [ 69.754724][ T8942] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 69.760605][ T8942] RIP: 0033:0x440349 [ 69.764493][ T8942] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 69.784104][ T8942] RSP: 002b:00007fff118b1118 EFLAGS: 00000246 ORIG_RAX: 0000000000000034 [ 69.793079][ T8942] RAX: ffffffffffffffda RBX: fe7f62c7329d9aaa RCX: 0000000000440349 [ 69.801149][ T8942] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 [ 69.809110][ T8942] RBP: 65e500001d7ef6cc R08: 00007fff118b1288 R09: 00007fff118b1288 [ 69.817071][ T8942] R10: 00007fff118b1288 R11: 0000000000000246 R12: 211e267fffffffff [ 69.825039][ T8942] R13: ffff000000004d02 R14: aac8030fa4d62b9c R15: d303a55487e71188 [ 69.833025][ T8942] ================================================================== [ 69.841070][ T8942] Disabling lock debugging due to kernel taint [ 69.848013][ T8942] Kernel panic - not syncing: panic_on_warn set ... [ 69.854626][ T8942] CPU: 0 PID: 8942 Comm: syz-executor466 Tainted: G B 5.4.0-syzkaller #0 [ 69.864504][ T8942] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 69.874539][ T8942] Call Trace: [ 69.877823][ T8942] dump_stack+0x197/0x210 [ 69.882165][ T8942] panic+0x2e3/0x75c [ 69.886036][ T8942] ? add_taint.cold+0x16/0x16 [ 69.890708][ T8942] ? llcp_sock_getname+0x358/0x460 [ 69.895801][ T8942] ? preempt_schedule+0x4b/0x60 [ 69.900651][ T8942] ? ___preempt_schedule+0x16/0x18 [ 69.905747][ T8942] ? trace_hardirqs_on+0x5e/0x240 [ 69.910773][ T8942] ? llcp_sock_getname+0x358/0x460 [ 69.915998][ T8942] end_report+0x47/0x4f [ 69.920237][ T8942] ? llcp_sock_getname+0x358/0x460 [ 69.925407][ T8942] __kasan_report.cold+0xe/0x41 [ 69.930419][ T8942] ? llcp_sock_getname+0x358/0x460 [ 69.935518][ T8942] kasan_report+0x12/0x20 [ 69.939881][ T8942] check_memory_region+0x134/0x1a0 [ 69.944980][ T8942] memcpy+0x24/0x50 [ 69.948771][ T8942] llcp_sock_getname+0x358/0x460 [ 69.953698][ T8942] __sys_getpeername+0x12b/0x290 [ 69.958615][ T8942] ? __ia32_sys_getsockname+0xb0/0xb0 [ 69.963971][ T8942] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 69.969407][ T8942] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 69.974858][ T8942] ? do_syscall_64+0x26/0x790 [ 69.979526][ T8942] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 69.985569][ T8942] ? do_syscall_64+0x26/0x790 [ 69.990227][ T8942] __x64_sys_getpeername+0x73/0xb0 [ 69.995314][ T8942] do_syscall_64+0xfa/0x790 [ 69.999796][ T8942] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 70.005665][ T8942] RIP: 0033:0x440349 [ 70.009541][ T8942] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 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 fb 13 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 70.029126][ T8942] RSP: 002b:00007fff118b1118 EFLAGS: 00000246 ORIG_RAX: 0000000000000034 [ 70.037517][ T8942] RAX: ffffffffffffffda RBX: fe7f62c7329d9aaa RCX: 0000000000440349 [ 70.045478][ T8942] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004 [ 70.053440][ T8942] RBP: 65e500001d7ef6cc R08: 00007fff118b1288 R09: 00007fff118b1288 [ 70.061389][ T8942] R10: 00007fff118b1288 R11: 0000000000000246 R12: 211e267fffffffff [ 70.069339][ T8942] R13: ffff000000004d02 R14: aac8030fa4d62b9c R15: d303a55487e71188 [ 70.078810][ T8942] Kernel Offset: disabled [ 70.083139][ T8942] Rebooting in 86400 seconds..