INIT: Entering runlevel: 2 [info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added 'ci-upstream-mmots-kasan-gce-7,10.128.0.39' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 18.765887] [ 18.766286] ============================= [ 18.766896] WARNING: suspicious RCU usage [ 18.767569] 4.14.0-mm1+ #25 Not tainted [ 18.768173] ----------------------------- [ 18.768729] ./include/trace/events/kmem.h:142 suspicious rcu_dereference_check() usage! [ 18.769870] [ 18.769870] other info that might help us debug this: [ 18.769870] [ 18.770995] [ 18.770995] rcu_scheduler_active = 2, debug_locks = 1 [ 18.771929] 1 lock held by syzkaller365682/3045: [ 18.772599] #0: (sk_lock-AF_ALG){+.+.}, at: [] af_alg_wait_for_data+0x2f2/0x650 [ 18.773914] [ 18.773914] stack backtrace: [ 18.774574] CPU: 0 PID: 3045 Comm: syzkaller365682 Not tainted 4.14.0-mm1+ #25 [ 18.775560] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 18.776779] Call Trace: [ 18.777139] dump_stack+0x194/0x257 [ 18.777632] ? arch_local_irq_restore+0x53/0x53 [ 18.778270] lockdep_rcu_suspicious+0x123/0x170 [ 18.778905] ? blkcipher_walk_done+0x72b/0xde0 [ 18.779520] kfree+0x20a/0x250 [ 18.779955] blkcipher_walk_done+0x72b/0xde0 [ 18.780551] encrypt+0x20e/0x540 [ 18.781023] ? salsa20_ivsetup+0x40/0x40 [ 18.781593] ? salsa20_ivsetup+0x40/0x40 [ 18.782156] skcipher_decrypt_blkcipher+0x213/0x310 [ 18.782822] ? skcipher_decrypt_blkcipher+0x213/0x310 [ 18.783511] ? sock_kmalloc+0x11f/0x190 [ 18.784063] ? skcipher_encrypt_blkcipher+0x310/0x310 [ 18.784752] ? lock_sock_nested+0x91/0x110 [ 18.785321] ? memset+0x31/0x40 [ 18.785787] skcipher_recvmsg+0xb06/0xf30 [ 18.788504] ? skcipher_sendpage_nokey+0xa0/0xa0 [ 18.793242] ? skcipher_check_key.isra.4+0x61/0x200 [ 18.798229] skcipher_recvmsg_nokey+0x60/0x80 [ 18.802695] ? skcipher_recvmsg+0xf30/0xf30 [ 18.806986] sock_recvmsg+0xc9/0x110 [ 18.810667] ? __sock_recv_wifi_status+0x210/0x210 [ 18.815567] ___sys_recvmsg+0x29b/0x630 [ 18.819518] ? ___sys_sendmsg+0x8a0/0x8a0 [ 18.823661] ? fget_raw+0x20/0x20 [ 18.827086] ? __handle_mm_fault+0x3dd0/0x3dd0 [ 18.831637] ? vmacache_find+0x5f/0x280 [ 18.835590] ? up_read+0x1a/0x40 [ 18.838927] ? __do_page_fault+0x3d6/0xc90 [ 18.843127] ? trace_hardirqs_on+0xd/0x10 [ 18.847248] ? __fdget+0x18/0x20 [ 18.850588] __sys_recvmsg+0xe2/0x210 [ 18.854354] ? __sys_recvmsg+0xe2/0x210 [ 18.858296] ? SyS_sendmmsg+0x60/0x60 [ 18.862067] ? __do_page_fault+0xc90/0xc90 [ 18.866272] ? SyS_setsockopt+0x215/0x360 [ 18.870401] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 18.875395] SyS_recvmsg+0x2d/0x50 [ 18.878907] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 18.883628] RIP: 0033:0x43fe59 [ 18.886790] RSP: 002b:00007ffeb5bb17e8 EFLAGS: 00000217 ORIG_RAX: 000000000000002f [ 18.894464] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fe59 [ 18.901704] RDX: 0000000000002000 RSI: 0000000020222fc8 RDI: 0000000000000004 [ 18.908942] RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000 [ 18.916180] R10: 0000000000000010 R11: 0000000000000217 R12: 00000000004017c0 [ 18.923416] R13: 0000000000401850 R14: 0000000000000000 R15: 0000000000000000 [ 18.930763] BUG: unable to handle kernel NULL pointer dereference at 0000000000000074 [ 18.938727] IP: kfree+0xb2/0x250 [ 18.942061] PGD 1cc493067 P4D 1cc493067 PUD 1ce1ba067 PMD 0 [ 18.947833] Oops: 0000 [#1] SMP KASAN [ 18.951601] Dumping ftrace buffer: [ 18.955106] (ftrace buffer empty) [ 18.958784] Modules linked in: [ 18.961946] CPU: 0 PID: 3045 Comm: syzkaller365682 Not tainted 4.14.0-mm1+ #25 [ 18.969268] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 18.978587] task: ffff8801cda363c0 task.stack: ffff8801d4458000 [ 18.984614] RIP: 0010:kfree+0xb2/0x250 [ 18.988470] RSP: 0018:ffff8801d445f750 EFLAGS: 00010046 [ 18.993802] RAX: 0000000000000000 RBX: ffff8801d445f918 RCX: ffffffffffffffff [ 19.001042] RDX: ffffea00075117c0 RSI: 0000000000000000 RDI: ffff8801d445f918 [ 19.008283] RBP: ffff8801d445f770 R08: 1ffff1003a88be9c R09: 0000000000000000 [ 19.015528] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000286 [ 19.022763] R13: 0000000000000000 R14: ffff8801d445f918 R15: ffff8801d445f880 [ 19.029999] FS: 00000000011cb880(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000 [ 19.038196] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 19.044048] CR2: 0000000000000074 CR3: 00000001cc49c000 CR4: 00000000001406f0 [ 19.051288] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 19.058525] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 19.065763] Call Trace: [ 19.068323] blkcipher_walk_done+0x72b/0xde0 [ 19.072703] encrypt+0x20e/0x540 [ 19.076041] ? salsa20_ivsetup+0x40/0x40 [ 19.080078] ? salsa20_ivsetup+0x40/0x40 [ 19.084106] skcipher_decrypt_blkcipher+0x213/0x310 [ 19.089089] ? skcipher_decrypt_blkcipher+0x213/0x310 [ 19.094245] ? sock_kmalloc+0x11f/0x190 [ 19.098190] ? skcipher_encrypt_blkcipher+0x310/0x310 [ 19.103345] ? lock_sock_nested+0x91/0x110 [ 19.107548] ? memset+0x31/0x40 [ 19.110796] skcipher_recvmsg+0xb06/0xf30 [ 19.114914] ? skcipher_sendpage_nokey+0xa0/0xa0 [ 19.119638] ? skcipher_check_key.isra.4+0x61/0x200 [ 19.124624] skcipher_recvmsg_nokey+0x60/0x80 [ 19.129087] ? skcipher_recvmsg+0xf30/0xf30 [ 19.133374] sock_recvmsg+0xc9/0x110 [ 19.137054] ? __sock_recv_wifi_status+0x210/0x210 [ 19.141951] ___sys_recvmsg+0x29b/0x630 [ 19.145899] ? ___sys_sendmsg+0x8a0/0x8a0 [ 19.150031] ? fget_raw+0x20/0x20 [ 19.153452] ? __handle_mm_fault+0x3dd0/0x3dd0 [ 19.157999] ? vmacache_find+0x5f/0x280 [ 19.161949] ? up_read+0x1a/0x40 [ 19.165283] ? __do_page_fault+0x3d6/0xc90 [ 19.169482] ? trace_hardirqs_on+0xd/0x10 [ 19.173600] ? __fdget+0x18/0x20 [ 19.177439] __sys_recvmsg+0xe2/0x210 [ 19.181207] ? __sys_recvmsg+0xe2/0x210 [ 19.185150] ? SyS_sendmmsg+0x60/0x60 [ 19.188918] ? __do_page_fault+0xc90/0xc90 [ 19.193120] ? SyS_setsockopt+0x215/0x360 [ 19.197240] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 19.202227] SyS_recvmsg+0x2d/0x50 [ 19.205734] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 19.210453] RIP: 0033:0x43fe59 [ 19.213611] RSP: 002b:00007ffeb5bb17e8 EFLAGS: 00000217 ORIG_RAX: 000000000000002f [ 19.221283] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fe59 [ 19.228518] RDX: 0000000000002000 RSI: 0000000020222fc8 RDI: 0000000000000004 [ 19.235756] RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000 [ 19.242993] R10: 0000000000000010 R11: 0000000000000217 R12: 00000000004017c0 [ 19.250230] R13: 0000000000401850 R14: 0000000000000000 R15: 0000000000000000 [ 19.257472] Code: c2 48 b8 00 00 00 00 00 ea ff ff 48 89 df 48 c1 ea 0c 48 c1 e2 06 48 01 c2 48 8b 42 20 48 8d 48 ff a8 01 48 0f 45 d1 4c 8b 6a 30 <49> 63 75 74 e8 a5 64 af ff 48 89 de 4c 89 ef 4c 8b 75 08 e8 76 [ 19.276537] RIP: kfree+0xb2/0x250 RSP: ffff8801d445f750 [ 19.281863] CR2: 0000000000000074 [ 19.285284] ---[ end trace f6bb56d2f2568570 ]--- [ 19.290003] Kernel panic - not syncing: Fatal exception in interrupt [ 19.296906] Dumping ftrace buffer: [ 19.300413] (ftrace buffer empty) [ 19.304088] Kernel Offset: disabled [ 19.307680] Rebooting in 86400 seconds..