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-net-kasan-gce-6,10.128.0.51' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 27.268248] [ 27.269925] ============================= [ 27.274222] WARNING: suspicious RCU usage [ 27.278366] 4.15.0-rc1+ #133 Not tainted [ 27.282426] ----------------------------- [ 27.286567] ./include/trace/events/kmem.h:142 suspicious rcu_dereference_check() usage! [ 27.294726] [ 27.294726] other info that might help us debug this: [ 27.294726] [ 27.302886] [ 27.302886] rcu_scheduler_active = 2, debug_locks = 1 [ 27.309566] 1 lock held by syzkaller407190/3092: [ 27.314397] #0: (sk_lock-AF_ALG){+.+.}, at: [<0000000072aab5ab>] af_alg_wait_for_data+0x2f2/0x650 [ 27.323599] [ 27.323599] stack backtrace: [ 27.328084] CPU: 1 PID: 3092 Comm: syzkaller407190 Not tainted 4.15.0-rc1+ #133 [ 27.335497] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.344817] Call Trace: [ 27.347378] dump_stack+0x194/0x257 [ 27.350976] ? arch_local_irq_restore+0x53/0x53 [ 27.355625] lockdep_rcu_suspicious+0x123/0x170 [ 27.360328] ? blkcipher_walk_done+0x72b/0xde0 [ 27.364880] kfree+0x20a/0x250 [ 27.368042] blkcipher_walk_done+0x72b/0xde0 [ 27.372423] encrypt+0x50a/0xaf0 [ 27.375763] ? salsa20_encrypt_bytes+0x300/0x300 [ 27.380506] ? salsa20_encrypt_bytes+0x300/0x300 [ 27.385227] skcipher_decrypt_blkcipher+0x213/0x310 [ 27.390223] ? skcipher_decrypt_blkcipher+0x213/0x310 [ 27.395379] ? sock_kmalloc+0x11f/0x190 [ 27.399322] ? skcipher_encrypt_blkcipher+0x310/0x310 [ 27.404480] ? lock_sock_nested+0x91/0x110 [ 27.408683] ? memset+0x31/0x40 [ 27.411935] skcipher_recvmsg+0xa54/0xf20 [ 27.416068] ? skcipher_release+0x50/0x50 [ 27.420189] ? selinux_socket_recvmsg+0x36/0x40 [ 27.424827] ? security_socket_recvmsg+0x91/0xc0 [ 27.429555] ? skcipher_release+0x50/0x50 [ 27.433671] sock_recvmsg+0xc9/0x110 [ 27.437353] ? __sock_recv_wifi_status+0x210/0x210 [ 27.442254] ___sys_recvmsg+0x29b/0x630 [ 27.446215] ? ___sys_sendmsg+0x8a0/0x8a0 [ 27.450352] ? __handle_mm_fault+0x3ad0/0x3ad0 [ 27.454901] ? vmacache_find+0x5f/0x280 [ 27.458850] ? up_read+0x1a/0x40 [ 27.462198] ? __do_page_fault+0x3d6/0xc90 [ 27.466407] ? fd_install+0x4d/0x60 [ 27.470027] ? __fdget+0x18/0x20 [ 27.473365] __sys_recvmsg+0xe2/0x210 [ 27.477134] ? __sys_recvmsg+0xe2/0x210 [ 27.481078] ? SyS_sendmmsg+0x60/0x60 [ 27.484849] ? __do_page_fault+0xc90/0xc90 [ 27.489056] ? SyS_setsockopt+0x215/0x360 [ 27.493190] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.498187] SyS_recvmsg+0x2d/0x50 [ 27.501700] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 27.506425] RIP: 0033:0x43fe99 [ 27.509585] RSP: 002b:00007ffd73544e78 EFLAGS: 00000207 ORIG_RAX: 000000000000002f [ 27.517266] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fe99 [ 27.524505] RDX: 0000000000000000 RSI: 0000000020d63fc8 RDI: 0000000000000004 [ 27.531745] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 27.538982] R10: 0000000000000000 R11: 0000000000000207 R12: 0000000000401800 [ 27.546221] R13: 0000000000401890 R14: 0000000000000000 R15: 0000000000000000 [ 27.553543] BUG: unable to handle kernel NULL pointer dereference at 000000003a72ae69 [ 27.561502] IP: kfree+0xb2/0x250 [ 27.564836] PGD 1cb1a8067 P4D 1cb1a8067 PUD 1cbfc7067 PMD 0 [ 27.570606] Oops: 0000 [#1] SMP KASAN [ 27.574373] Dumping ftrace buffer: [ 27.577877] (ftrace buffer empty) [ 27.581551] Modules linked in: [ 27.584709] CPU: 1 PID: 3092 Comm: syzkaller407190 Not tainted 4.15.0-rc1+ #133 [ 27.592117] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.601436] task: 00000000b9f6d75c task.stack: 00000000940cdd0d [ 27.607466] RIP: 0010:kfree+0xb2/0x250 [ 27.611316] RSP: 0018:ffff8801bf44f780 EFLAGS: 00010046 [ 27.616645] RAX: 0000000000000000 RBX: ffff8801bf44f948 RCX: ffffffffffffffff [ 27.623880] RDX: ffffea0006fd13c0 RSI: 0000000000000000 RDI: ffff8801bf44f948 [ 27.631115] RBP: ffff8801bf44f7a0 R08: 1ffff10037e89ea2 R09: 0000000000000000 [ 27.638352] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000286 [ 27.645587] R13: 0000000000000000 R14: ffff8801bf44f948 R15: ffff8801bf44f8b0 [ 27.652824] FS: 000000000087b880(0000) GS:ffff8801db500000(0000) knlGS:0000000000000000 [ 27.661025] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.666872] CR2: 0000000000000074 CR3: 00000001cb2b4000 CR4: 00000000001406e0 [ 27.674109] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.681344] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.688577] Call Trace: [ 27.691134] blkcipher_walk_done+0x72b/0xde0 [ 27.695511] encrypt+0x50a/0xaf0 [ 27.698845] ? salsa20_encrypt_bytes+0x300/0x300 [ 27.703574] ? salsa20_encrypt_bytes+0x300/0x300 [ 27.708304] skcipher_decrypt_blkcipher+0x213/0x310 [ 27.713291] ? skcipher_decrypt_blkcipher+0x213/0x310 [ 27.718447] ? sock_kmalloc+0x11f/0x190 [ 27.722387] ? skcipher_encrypt_blkcipher+0x310/0x310 [ 27.727539] ? lock_sock_nested+0x91/0x110 [ 27.731740] ? memset+0x31/0x40 [ 27.734986] skcipher_recvmsg+0xa54/0xf20 [ 27.739105] ? skcipher_release+0x50/0x50 [ 27.743219] ? selinux_socket_recvmsg+0x36/0x40 [ 27.747855] ? security_socket_recvmsg+0x91/0xc0 [ 27.752576] ? skcipher_release+0x50/0x50 [ 27.756695] sock_recvmsg+0xc9/0x110 [ 27.760382] ? __sock_recv_wifi_status+0x210/0x210 [ 27.765278] ___sys_recvmsg+0x29b/0x630 [ 27.769227] ? ___sys_sendmsg+0x8a0/0x8a0 [ 27.773349] ? __handle_mm_fault+0x3ad0/0x3ad0 [ 27.777895] ? vmacache_find+0x5f/0x280 [ 27.781838] ? up_read+0x1a/0x40 [ 27.785171] ? __do_page_fault+0x3d6/0xc90 [ 27.789369] ? fd_install+0x4d/0x60 [ 27.792967] ? __fdget+0x18/0x20 [ 27.796300] __sys_recvmsg+0xe2/0x210 [ 27.800065] ? __sys_recvmsg+0xe2/0x210 [ 27.804004] ? SyS_sendmmsg+0x60/0x60 [ 27.807772] ? __do_page_fault+0xc90/0xc90 [ 27.811980] ? SyS_setsockopt+0x215/0x360 [ 27.816099] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 27.821083] SyS_recvmsg+0x2d/0x50 [ 27.824591] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 27.829309] RIP: 0033:0x43fe99 [ 27.832462] RSP: 002b:00007ffd73544e78 EFLAGS: 00000207 ORIG_RAX: 000000000000002f [ 27.840144] RAX: ffffffffffffffda RBX: 00000000004002c8 RCX: 000000000043fe99 [ 27.847379] RDX: 0000000000000000 RSI: 0000000020d63fc8 RDI: 0000000000000004 [ 27.854614] RBP: 00000000006ca018 R08: 0000000000000000 R09: 0000000000000000 [ 27.861857] R10: 0000000000000000 R11: 0000000000000207 R12: 0000000000401800 [ 27.869090] R13: 0000000000401890 R14: 0000000000000000 R15: 0000000000000000 [ 27.876331] 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 95 75 af ff 48 89 de 4c 89 ef 4c 8b 75 08 e8 06 [ 27.895417] RIP: kfree+0xb2/0x250 RSP: ffff8801bf44f780 [ 27.900746] CR2: 0000000000000074 [ 27.904168] ---[ end trace f2bae6aa675ba074 ]--- [ 27.908886] Kernel panic - not syncing: Fatal exception in interrupt [ 27.915370] Dumping ftrace buffer: [ 27.918883] (ftrace buffer empty) [ 27.922557] Kernel Offset: disabled [ 27.926150] Rebooting in 86400 seconds..