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-kasan-gce-3,10.128.0.20' (ECDSA) to the list of known hosts. net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz7.accept_dad = 0 net.ipv6.conf.syz3.accept_dad = 0 net.ipv6.conf.syz4.accept_dad = 0 net.ipv6.conf.syz1.accept_dad = 0 net.ipv6.conf.syz6.accept_dad = 0 net.ipv6.conf.syz2.accept_dad = 0 net.ipv6.conf.syz5.accept_dad = 0 net.ipv6.conf.syz0.router_solicitations = 0 net.ipv6.conf.syz7.router_solicitations = 0 net.ipv6.conf.syz3.router_solicitations = 0 net.ipv6.conf.syz6.router_solicitations = 0 net.ipv6.conf.syz1.router_solicitations = 0 net.ipv6.conf.syz2.router_solicitations = 0 net.ipv6.conf.syz4.router_solicitations = 0 net.ipv6.conf.syz5.router_solicitations = 0 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 37.515061] ================================================================== [ 37.516976] BUG: KASAN: use-after-free in aead_recvmsg+0x1827/0x1bc0 [ 37.518442] Write of size 4 at addr ffff8801c12ae3b4 by task syzkaller070698/4201 [ 37.520084] [ 37.520507] CPU: 0 PID: 4201 Comm: syzkaller070698 Not tainted 4.15.0-rc1+ #205 [ 37.522500] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.524305] Call Trace: [ 37.524670] dump_stack+0x194/0x257 [ 37.525168] ? arch_local_irq_restore+0x53/0x53 [ 37.525811] ? show_regs_print_info+0x65/0x65 [ 37.526416] ? pcrypt_aead_enc+0x100/0x100 [ 37.526985] ? aead_recvmsg+0x1827/0x1bc0 [ 37.527560] print_address_description+0x73/0x250 [ 37.528206] ? aead_recvmsg+0x1827/0x1bc0 [ 37.528762] kasan_report+0x25b/0x340 [ 37.529279] __asan_report_store4_noabort+0x17/0x20 [ 37.529945] aead_recvmsg+0x1827/0x1bc0 [ 37.530498] ? aead_release+0x50/0x50 [ 37.531021] ? selinux_socket_recvmsg+0x36/0x40 [ 37.531654] ? security_socket_recvmsg+0x91/0xc0 [ 37.532299] ? aead_release+0x50/0x50 [ 37.532813] sock_recvmsg+0xc9/0x110 [ 37.533324] sock_read_iter+0x361/0x560 [ 37.533862] ? sock_recvmsg+0x110/0x110 [ 37.534404] ? selinux_file_permission+0x82/0x460 [ 37.535061] ? rw_verify_area+0xe5/0x2b0 [ 37.535615] aio_read+0x2b0/0x3a0 [ 37.539042] ? aio_write+0x5a0/0x5a0 [ 37.542728] ? lock_downgrade+0x980/0x980 [ 37.546852] ? lock_release+0xda0/0xda0 [ 37.550825] ? __might_sleep+0x95/0x190 [ 37.554779] do_io_submit+0xf99/0x14f0 [ 37.558635] ? do_io_submit+0xf99/0x14f0 [ 37.562680] ? aio_read+0x3a0/0x3a0 [ 37.566286] ? mm_fault_error+0x2c0/0x2c0 [ 37.570412] ? lock_downgrade+0x980/0x980 [ 37.574534] ? SyS_io_setup+0x10e/0x390 [ 37.578483] ? do_page_fault+0xee/0x720 [ 37.582426] ? __do_page_fault+0xc90/0xc90 [ 37.586646] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 37.591639] SyS_io_submit+0x27/0x30 [ 37.595320] ? SyS_io_submit+0x27/0x30 [ 37.599177] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 37.603902] RIP: 0033:0x445429 [ 37.607061] RSP: 002b:00007ffd3e7ad908 EFLAGS: 00000213 ORIG_RAX: 00000000000000d1 [ 37.614736] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000445429 [ 37.621973] RDX: 0000000020738000 RSI: 0000000000000001 RDI: 00007fac97dfb000 [ 37.629209] RBP: 000000000000924f R08: 0000000000000000 R09: 0000000000000006 [ 37.636456] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000000000 [ 37.643701] R13: 0000000000402620 R14: 0000000000000000 R15: 0000000000000000 [ 37.650952] [ 37.652548] Allocated by task 4201: [ 37.656144] save_stack+0x43/0xd0 [ 37.659562] kasan_kmalloc+0xad/0xe0 [ 37.663244] __kmalloc+0x162/0x760 [ 37.666751] sock_kmalloc+0x112/0x190 [ 37.670521] af_alg_alloc_areq+0x74/0x2f0 [ 37.674642] aead_recvmsg+0x443/0x1bc0 [ 37.678505] sock_recvmsg+0xc9/0x110 [ 37.682188] sock_read_iter+0x361/0x560 [ 37.686135] aio_read+0x2b0/0x3a0 [ 37.689554] do_io_submit+0xf99/0x14f0 [ 37.693410] SyS_io_submit+0x27/0x30 [ 37.697094] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 37.701818] [ 37.703414] Freed by task 17: [ 37.706487] save_stack+0x43/0xd0 [ 37.709909] kasan_slab_free+0x71/0xc0 [ 37.713766] kfree+0xca/0x250 [ 37.716849] sock_kfree_s+0x29/0x60 [ 37.720448] af_alg_free_resources+0x6b/0x80 [ 37.724836] af_alg_async_cb+0xbc/0x160 [ 37.728783] pcrypt_aead_serial+0x75/0xa0 [ 37.732899] padata_serial_worker+0x476/0x750 [ 37.737371] process_one_work+0xbfd/0x1be0 [ 37.741570] worker_thread+0x223/0x1990 [ 37.745516] kthread+0x37a/0x440 [ 37.748855] ret_from_fork+0x24/0x30 [ 37.752533] [ 37.754131] The buggy address belongs to the object at ffff8801c12ae0c0 [ 37.754131] which belongs to the cache kmalloc-2048 of size 2048 [ 37.766927] The buggy address is located 756 bytes inside of [ 37.766927] 2048-byte region [ffff8801c12ae0c0, ffff8801c12ae8c0) [ 37.778851] The buggy address belongs to the page: [ 37.783750] page:00000000be9d3a3a count:1 mapcount:0 mapping:000000001fc03083 index:0x0 compound_mapcount: 0 [ 37.793686] flags: 0x2fffc0000008100(slab|head) [ 37.798322] raw: 02fffc0000008100 ffff8801c12ae0c0 0000000000000000 0000000100000003 [ 37.806172] raw: ffffea000704d3a0 ffffea0007033920 ffff8801db000c40 0000000000000000 [ 37.814020] page dumped because: kasan: bad access detected [ 37.819701] [ 37.821293] Memory state around the buggy address: [ 37.826189] ffff8801c12ae280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 37.833522] ffff8801c12ae300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 37.840854] >ffff8801c12ae380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 37.848177] ^ [ 37.853074] ffff8801c12ae400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 37.860402] ffff8801c12ae480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 37.867726] ================================================================== [ 37.875047] Disabling lock debugging due to kernel taint [ 37.880589] Kernel panic - not syncing: panic_on_warn set ... [ 37.880589] [ 37.887921] CPU: 0 PID: 4201 Comm: syzkaller070698 Tainted: G B 4.15.0-rc1+ #205 [ 37.896633] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 37.905955] Call Trace: [ 37.908508] dump_stack+0x194/0x257 [ 37.912101] ? arch_local_irq_restore+0x53/0x53 [ 37.916741] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 37.921467] ? vsnprintf+0x1ed/0x1900 [ 37.925241] ? aead_recvmsg+0x1740/0x1bc0 [ 37.929356] panic+0x1e4/0x41c [ 37.932514] ? refcount_error_report+0x214/0x214 [ 37.937236] ? add_taint+0x1c/0x50 [ 37.940743] ? add_taint+0x1c/0x50 [ 37.944247] ? aead_recvmsg+0x1827/0x1bc0 [ 37.948361] kasan_end_report+0x50/0x50 [ 37.952305] kasan_report+0x144/0x340 [ 37.956072] __asan_report_store4_noabort+0x17/0x20 [ 37.961055] aead_recvmsg+0x1827/0x1bc0 [ 37.965003] ? aead_release+0x50/0x50 [ 37.968777] ? selinux_socket_recvmsg+0x36/0x40 [ 37.973414] ? security_socket_recvmsg+0x91/0xc0 [ 37.978134] ? aead_release+0x50/0x50 [ 37.981904] sock_recvmsg+0xc9/0x110 [ 37.985589] sock_read_iter+0x361/0x560 [ 37.989531] ? sock_recvmsg+0x110/0x110 [ 37.993478] ? selinux_file_permission+0x82/0x460 [ 37.998295] ? rw_verify_area+0xe5/0x2b0 [ 38.002323] aio_read+0x2b0/0x3a0 [ 38.005743] ? aio_write+0x5a0/0x5a0 [ 38.009423] ? lock_downgrade+0x980/0x980 [ 38.013540] ? lock_release+0xda0/0xda0 [ 38.017487] ? __might_sleep+0x95/0x190 [ 38.021429] do_io_submit+0xf99/0x14f0 [ 38.025280] ? do_io_submit+0xf99/0x14f0 [ 38.029309] ? aio_read+0x3a0/0x3a0 [ 38.032902] ? mm_fault_error+0x2c0/0x2c0 [ 38.037019] ? lock_downgrade+0x980/0x980 [ 38.041145] ? SyS_io_setup+0x10e/0x390 [ 38.045104] ? do_page_fault+0xee/0x720 [ 38.049047] ? __do_page_fault+0xc90/0xc90 [ 38.053259] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 38.058242] SyS_io_submit+0x27/0x30 [ 38.061923] ? SyS_io_submit+0x27/0x30 [ 38.065776] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 38.070499] RIP: 0033:0x445429 [ 38.073656] RSP: 002b:00007ffd3e7ad908 EFLAGS: 00000213 ORIG_RAX: 00000000000000d1 [ 38.081333] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000445429 [ 38.088570] RDX: 0000000020738000 RSI: 0000000000000001 RDI: 00007fac97dfb000 [ 38.095804] RBP: 000000000000924f R08: 0000000000000000 R09: 0000000000000006 [ 38.103038] R10: 0000000000000000 R11: 0000000000000213 R12: 0000000000000000 [ 38.110274] R13: 0000000000402620 R14: 0000000000000000 R15: 0000000000000000 [ 38.117973] Dumping ftrace buffer: [ 38.121482] (ftrace buffer empty) [ 38.125158] Kernel Offset: disabled [ 38.128751] Rebooting in 86400 seconds..