[info] Using makefile-style concurrent boot in runlevel 2. [....] Starting enhanced syslogd: rsyslogd[ 9.144368] rsyslogd (2922) used greatest stack depth: 15544 bytes left [?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-next-kasan-gce-6,10.128.0.34' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 32.600165] [ 32.600511] ============================= [ 32.601186] WARNING: suspicious RCU usage [ 32.601766] 4.14.0-next-20171124+ #51 Not tainted [ 32.602428] ----------------------------- [ 32.602996] ./include/trace/events/kmem.h:142 suspicious rcu_dereference_check() usage! [ 32.604150] [ 32.604150] other info that might help us debug this: [ 32.604150] [ 32.605245] [ 32.605245] rcu_scheduler_active = 2, debug_locks = 1 [ 32.606305] 1 lock held by syzkaller632005/3049: [ 32.607032] #0: (sk_lock-AF_ALG){+.+.}, at: [] af_alg_wait_for_data+0x2f2/0x650 [ 32.608293] [ 32.608293] stack backtrace: [ 32.608894] CPU: 0 PID: 3049 Comm: syzkaller632005 Not tainted 4.14.0-next-20171124+ #51 [ 32.609983] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.611218] Call Trace: [ 32.611574] dump_stack+0x194/0x257 [ 32.612064] ? arch_local_irq_restore+0x53/0x53 [ 32.612718] lockdep_rcu_suspicious+0x123/0x170 [ 32.613340] ? blkcipher_walk_done+0x72b/0xde0 [ 32.613953] kfree+0x20a/0x250 [ 32.614388] blkcipher_walk_done+0x72b/0xde0 [ 32.614986] encrypt+0x20e/0x540 [ 32.615444] ? salsa20_ivsetup+0x40/0x40 [ 32.616005] ? salsa20_ivsetup+0x40/0x40 [ 32.616549] skcipher_decrypt_blkcipher+0x213/0x310 [ 32.617213] ? skcipher_decrypt_blkcipher+0x213/0x310 [ 32.617903] ? sock_kmalloc+0x11f/0x190 [ 32.618438] ? skcipher_encrypt_blkcipher+0x310/0x310 [ 32.619125] ? lock_sock_nested+0x91/0x110 [ 32.619694] ? memset+0x31/0x40 [ 32.620143] skcipher_recvmsg+0xb06/0xf30 [ 32.620713] ? skcipher_sendpage_nokey+0xa0/0xa0 [ 32.625442] ? skcipher_check_key.isra.4+0x61/0x200 [ 32.630428] skcipher_recvmsg_nokey+0x60/0x80 [ 32.634900] ? skcipher_recvmsg+0xf30/0xf30 [ 32.639188] sock_recvmsg+0xc9/0x110 [ 32.642866] ? __sock_recv_wifi_status+0x210/0x210 [ 32.647763] ___sys_recvmsg+0x29b/0x630 [ 32.651710] ? ___sys_sendmsg+0x8a0/0x8a0 [ 32.655843] ? fget_raw+0x20/0x20 [ 32.659264] ? __handle_mm_fault+0x3dd0/0x3dd0 [ 32.663811] ? vmacache_find+0x5f/0x280 [ 32.667757] ? up_read+0x1a/0x40 [ 32.671090] ? __do_page_fault+0x3d6/0xc90 [ 32.675289] ? trace_hardirqs_on+0xd/0x10 [ 32.679410] ? __fdget+0x18/0x20 [ 32.682746] __sys_recvmsg+0xe2/0x210 [ 32.686510] ? __sys_recvmsg+0xe2/0x210 [ 32.690453] ? SyS_sendmmsg+0x60/0x60 [ 32.694224] ? __do_page_fault+0xc90/0xc90 [ 32.698426] ? SyS_setsockopt+0x215/0x360 [ 32.702553] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 32.707541] SyS_recvmsg+0x2d/0x50 [ 32.711055] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 32.715774] RIP: 0033:0x43fe59 [ 32.718929] RSP: 002b:00007fff5248aa88 EFLAGS: 00000217 ORIG_RAX: 000000000000002f [ 32.726603] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fe59 [ 32.733836] RDX: 0000000000002000 RSI: 0000000020222fc8 RDI: 0000000000000004 [ 32.741072] RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000 [ 32.748307] R10: 0000000000000010 R11: 0000000000000217 R12: 00000000004017c0 [ 32.755545] R13: 0000000000401850 R14: 0000000000000000 R15: 0000000000000000 [ 32.762870] BUG: unable to handle kernel NULL pointer dereference at 0000000000000074 [ 32.770817] IP: kfree+0xb2/0x250 [ 32.774143] PGD 1cddc8067 P4D 1cddc8067 PUD 1ce910067 PMD 0 [ 32.779908] Oops: 0000 [#1] SMP KASAN [ 32.783674] Dumping ftrace buffer: [ 32.787174] (ftrace buffer empty) [ 32.790846] Modules linked in: [ 32.794007] CPU: 0 PID: 3049 Comm: syzkaller632005 Not tainted 4.14.0-next-20171124+ #51 [ 32.802193] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 32.811510] task: ffff8801cd38e4c0 task.stack: ffff8801cd2a0000 [ 32.817535] RIP: 0010:kfree+0xb2/0x250 [ 32.821382] RSP: 0018:ffff8801cd2a7750 EFLAGS: 00010046 [ 32.826707] RAX: 0000000000000000 RBX: ffff8801cd2a7918 RCX: ffffffffffffffff [ 32.833940] RDX: ffffea000734a9c0 RSI: 0000000000000000 RDI: ffff8801cd2a7918 [ 32.841177] RBP: ffff8801cd2a7770 R08: 1ffff10039a54e9c R09: 0000000000000000 [ 32.848410] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000286 [ 32.855643] R13: 0000000000000000 R14: ffff8801cd2a7918 R15: ffff8801cd2a7880 [ 32.862877] FS: 00000000014e1880(0000) GS:ffff8801db400000(0000) knlGS:0000000000000000 [ 32.871068] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 32.876913] CR2: 0000000000000074 CR3: 00000001cdd44000 CR4: 00000000001406f0 [ 32.884149] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 32.891385] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 32.898618] Call Trace: [ 32.901173] blkcipher_walk_done+0x72b/0xde0 [ 32.905551] encrypt+0x20e/0x540 [ 32.908884] ? salsa20_ivsetup+0x40/0x40 [ 32.912921] ? salsa20_ivsetup+0x40/0x40 [ 32.916953] skcipher_decrypt_blkcipher+0x213/0x310 [ 32.921931] ? skcipher_decrypt_blkcipher+0x213/0x310 [ 32.927085] ? sock_kmalloc+0x11f/0x190 [ 32.931023] ? skcipher_encrypt_blkcipher+0x310/0x310 [ 32.936176] ? lock_sock_nested+0x91/0x110 [ 32.940392] ? memset+0x31/0x40 [ 32.943645] skcipher_recvmsg+0xb06/0xf30 [ 32.947770] ? skcipher_sendpage_nokey+0xa0/0xa0 [ 32.952893] ? skcipher_check_key.isra.4+0x61/0x200 [ 32.957874] skcipher_recvmsg_nokey+0x60/0x80 [ 32.962341] ? skcipher_recvmsg+0xf30/0xf30 [ 32.966628] sock_recvmsg+0xc9/0x110 [ 32.970303] ? __sock_recv_wifi_status+0x210/0x210 [ 32.975202] ___sys_recvmsg+0x29b/0x630 [ 32.979143] ? ___sys_sendmsg+0x8a0/0x8a0 [ 32.983264] ? fget_raw+0x20/0x20 [ 32.986681] ? __handle_mm_fault+0x3dd0/0x3dd0 [ 32.991225] ? vmacache_find+0x5f/0x280 [ 32.995166] ? up_read+0x1a/0x40 [ 32.998495] ? __do_page_fault+0x3d6/0xc90 [ 33.002691] ? trace_hardirqs_on+0xd/0x10 [ 33.006803] ? __fdget+0x18/0x20 [ 33.010134] __sys_recvmsg+0xe2/0x210 [ 33.013896] ? __sys_recvmsg+0xe2/0x210 [ 33.017834] ? SyS_sendmmsg+0x60/0x60 [ 33.021599] ? __do_page_fault+0xc90/0xc90 [ 33.025798] ? SyS_setsockopt+0x215/0x360 [ 33.029914] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 33.034900] SyS_recvmsg+0x2d/0x50 [ 33.038404] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 33.043124] RIP: 0033:0x43fe59 [ 33.046277] RSP: 002b:00007fff5248aa88 EFLAGS: 00000217 ORIG_RAX: 000000000000002f [ 33.053948] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fe59 [ 33.061182] RDX: 0000000000002000 RSI: 0000000020222fc8 RDI: 0000000000000004 [ 33.068416] RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000 [ 33.075650] R10: 0000000000000010 R11: 0000000000000217 R12: 00000000004017c0 [ 33.082883] R13: 0000000000401850 R14: 0000000000000000 R15: 0000000000000000 [ 33.090122] 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 59 af ff 48 89 de 4c 89 ef 4c 8b 75 08 e8 76 [ 33.109184] RIP: kfree+0xb2/0x250 RSP: ffff8801cd2a7750 [ 33.114506] CR2: 0000000000000074 [ 33.117925] ---[ end trace ef5cc6f059e06a5f ]--- [ 33.122647] Kernel panic - not syncing: Fatal exception in interrupt [ 33.129130] Dumping ftrace buffer: [ 33.132635] (ftrace buffer empty) [ 33.136308] Kernel Offset: disabled [ 33.139899] Rebooting in 86400 seconds..