[....] Starting enhanced syslogd: rsyslogd[ 11.608107] audit: type=1400 audit(1515484983.599:4): avc: denied { syslog } for pid=3184 comm="rsyslogd" capability=34 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1 [?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.52' (ECDSA) to the list of known hosts. net.ipv6.conf.syz6.accept_dad = 0 net.ipv6.conf.syz4.accept_dad = 0 net.ipv6.conf.syz3.accept_dad = 0 net.ipv6.conf.syz7.accept_dad = 0 net.ipv6.conf.syz1.accept_dad = 0 net.ipv6.conf.syz2.accept_dad = 0 net.ipv6.conf.syz6.router_solicitations = 0 net.ipv6.conf.syz5.accept_dad = 0 net.ipv6.conf.syz0.accept_dad = 0 net.ipv6.conf.syz4.router_solicitations = 0 net.ipv6.conf.syz3.router_solicitations = 0 net.ipv6.conf.syz7.router_solicitations = 0 net.ipv6.conf.syz5.router_solicitations = 0 net.ipv6.conf.syz2.router_solicitations = 0 net.ipv6.conf.syz0.router_solicitations = 0 net.ipv6.conf.syz1.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 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: [ 20.226192] kasan: CONFIG_KASAN_INLINE enabled [ 20.226755] BUG: spinlock bad magic on CPU#0, syzkaller247132/3336 [ 20.226763] lock: 0xffff8801bdcd8018, .magic: dead4eac, .owner: /-1, .owner_cpu: -1 [ 20.226769] CPU: 0 PID: 3336 Comm: syzkaller247132 Not tainted 4.9.75-gb54d99a #18 [ 20.226772] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 20.226783] ffff8801db207898 ffffffff81d93049 ffff8801bdcd8018 ffff8801c9230000 [ 20.226790] 0000000000000001 0000000000000001 0000000000000000 ffff8801db2078d8 [ 20.226797] ffffffff812476ed ffffffff81222a2e 0000000000000000 0000000000000000 [ 20.226799] Call Trace: [ 20.226810] [ 20.226811] [] dump_stack+0xc1/0x128 [ 20.226819] [] spin_dump+0x14d/0x280 [ 20.226824] [] ? __wake_up+0x1e/0x50 [ 20.226830] [] do_raw_spin_lock+0x174/0x1e0 [ 20.226837] [] _raw_spin_lock_irqsave+0x56/0x70 [ 20.226842] [] ? __wake_up+0x1e/0x50 [ 20.226847] [] __wake_up+0x1e/0x50 [ 20.226854] [] sg_rq_end_io+0x5dc/0xbc0 [ 20.226859] [] ? sg_release+0x1e0/0x1e0 [ 20.226866] [] ? blk_account_io_done+0xb4/0x860 [ 20.226875] [] ? sg_free_table_chained+0x71/0x80 [ 20.226880] [] ? sg_release+0x1e0/0x1e0 [ 20.226887] [] __blk_mq_end_request+0x54/0xc0 [ 20.226894] [] scsi_end_request+0x135/0x5c0 [ 20.226900] [] scsi_io_completion+0x15de/0x1730 [ 20.226906] [] ? scsi_unblock_requests+0x50/0x50 [ 20.226913] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 20.226919] [] scsi_finish_command+0x3b8/0x530 [ 20.226924] [] scsi_softirq_done+0x250/0x350 [ 20.226930] [] __blk_mq_complete_request+0x205/0x4b0 [ 20.226936] [] blk_mq_complete_request+0x65/0x80 [ 20.226942] [] scsi_mq_done+0xce/0x320 [ 20.226948] [] virtscsi_complete_cmd+0x5cf/0x7f0 [ 20.226954] [] ? virtscsi_remove+0x140/0x140 [ 20.226959] [] virtscsi_vq_done+0xc9/0x170 [ 20.226965] [] ? virtscsi_target_destroy+0x50/0x50 [ 20.226970] [] virtscsi_req_done+0xa7/0xd0 [ 20.226975] [] ? virtscsi_vq_done+0x170/0x170 [ 20.226982] [] vring_interrupt+0x109/0x150 [ 20.226988] [] ? vring_create_virtqueue+0x3f0/0x3f0 [ 20.226995] [] __handle_irq_event_percpu+0xef/0x800 [ 20.227001] [] handle_irq_event_percpu+0x74/0x150 [ 20.227006] [] ? __handle_irq_event_percpu+0x800/0x800 [ 20.227012] [] ? handle_irq_event+0x9f/0x140 [ 20.227018] [] handle_irq_event+0xa7/0x140 [ 20.227023] [] handle_edge_irq+0x1fa/0x8e0 [ 20.227031] [] handle_irq+0x24e/0x3b0 [ 20.227038] [] ? check_preemption_disabled+0x3b/0x200 [ 20.227044] [] do_IRQ+0x89/0x1b0 [ 20.227049] [] common_interrupt+0xa0/0xa0 [ 20.227057] [ 20.227057] [] ? clear_page_c_e+0x7/0x10 [ 20.227063] [] ? clear_huge_page+0xe9/0x470 [ 20.227069] [] ? __raw_spin_lock_init+0x2d/0x100 [ 20.227076] [] do_huge_pmd_anonymous_page+0x6c2/0x10d0 [ 20.227082] [] handle_mm_fault+0x158b/0x2530 [ 20.227089] [] ? __inode_security_revalidate+0xd9/0x130 [ 20.227094] [] ? __pmd_alloc+0x410/0x410 [ 20.227100] [] ? __lock_is_held+0xa1/0xf0 [ 20.227107] [] __do_page_fault+0x5c2/0xd40 [ 20.227114] [] ? mm_fault_error+0x2c0/0x2c0 [ 20.227120] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 20.227126] [] do_page_fault+0x27/0x30 [ 20.227131] [] page_fault+0x28/0x30 [ 20.262356] kasan: CONFIG_KASAN_INLINE enabled [ 20.262359] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 20.262367] general protection fault: 0000 [#1] PREEMPT SMP KASAN [ 20.262371] Dumping ftrace buffer: [ 20.262374] (ftrace buffer empty) [ 20.262378] Modules linked in: [ 20.262385] CPU: 0 PID: 3334 Comm: syzkaller247132 Not tainted 4.9.75-gb54d99a #18 [ 20.262388] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 20.262392] task: ffff8801c9b9e000 task.stack: ffff8801c8770000 [ 20.262407] RIP: 0010:[] [] __free_pages+0x21/0x80 [ 20.262410] RSP: 0018:ffff8801c8777940 EFLAGS: 00010a07 [ 20.262414] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff8266631b [ 20.262418] RDX: 1bd5a9d5a0000003 RSI: 0000000000000002 RDI: dead4ead0000001c [ 20.262421] RBP: ffff8801c8777950 R08: 0000000000000001 R09: 0000000000000000 [ 20.262425] R10: 0000000000000000 R11: ffff8801c9b9e000 R12: 0000000000000004 [ 20.262428] R13: 0000000000000020 R14: ffff8801bdd72100 R15: dffffc0000000000 [ 20.262434] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000009b6f840 [ 20.262438] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 20.262441] CR2: 0000000020536000 CR3: 00000001c88b8000 CR4: 0000000000160670 [ 20.262447] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 20.262450] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 20.262451] Stack: [ 20.262461] ffff8801c9b9e000 ffff8801bdd72258 ffff8801c87779b0 ffffffff82666341 [ 20.262470] ffff8801bdd72270 ffffed0037bae44b ffffed0037bae44e ffff8801bdd72268 [ 20.262478] dead4ead00000000 ffff8801bdd72240 0000000000000000 0000000000000000 [ 20.262479] Call Trace: [ 20.262489] [] sg_remove_scat.isra.19+0x1c1/0x2d0 [ 20.262495] [] sg_finish_rem_req+0x2b5/0x340 [ 20.262502] [] sg_new_read.isra.20+0x39/0x3e0 [ 20.262507] [] ? sg_get_rq_mark+0x142/0x190 [ 20.262513] [] sg_read+0x8bd/0x1440 [ 20.262521] [] ? kasan_unpoison_shadow+0x35/0x50 [ 20.262528] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 20.262536] [] ? fsnotify+0xf30/0xf30 [ 20.262545] [] ? avc_policy_seqno+0x9/0x20 [ 20.262554] [] do_loop_readv_writev.part.17+0x141/0x1e0 [ 20.262560] [] ? security_file_permission+0x89/0x1e0 [ 20.262566] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 20.262572] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 20.262579] [] compat_do_readv_writev+0x522/0x760 [ 20.262585] [] ? do_pwritev+0x1a0/0x1a0 [ 20.262595] [] ? _raw_spin_unlock+0x2c/0x50 [ 20.262602] [] ? handle_mm_fault+0x6ee/0x2530 [ 20.262607] [] ? __pmd_alloc+0x410/0x410 [ 20.262613] [] ? fsnotify+0x86/0xf30 [ 20.262620] [] ? fsnotify+0xf30/0xf30 [ 20.262626] [] compat_readv+0xe3/0x150 [ 20.262633] [] do_compat_readv+0xf4/0x1d0 [ 20.262639] [] ? compat_readv+0x150/0x150 [ 20.262646] [] compat_SyS_readv+0x26/0x30 [ 20.262652] [] ? SyS_pwritev2+0x80/0x80 [ 20.262660] [] do_fast_syscall_32+0x2f7/0x890 [ 20.262666] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 20.262672] [] entry_SYSENTER_compat+0x74/0x83 [ 20.262769] Code: e9 27 fc ff ff 0f 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 48 89 fb 48 83 c7 1c 48 89 fa 48 83 ec 08 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 3d [ 20.262776] RIP [] __free_pages+0x21/0x80 [ 20.262778] RSP [ 20.262785] ---[ end trace afabfd5f48ab9cf2 ]--- [ 20.262788] Kernel panic - not syncing: Fatal exception [ 20.265636] Dumping ftrace buffer: [ 20.265638] (ftrace buffer empty) [ 20.265640] Kernel Offset: disabled [ 21.022866] Rebooting in 86400 seconds..