[....] Starting enhanced syslogd: rsyslogd[ 12.952210] audit: type=1400 audit(1515698987.476:5): avc: denied { syslog } for pid=3340 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[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.907199] audit: type=1400 audit(1515698993.431:6): avc: denied { map } for pid=3482 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.15.246' (ECDSA) to the list of known hosts. 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 [ 25.092540] audit: type=1400 audit(1515698999.616:7): avc: denied { map } for pid=3497 comm="syzkaller160942" path="/root/syzkaller160942701" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 25.136931] page:ffffea0007038040 count:0 mapcount:0 mapping: (null) index:0x0 [ 25.136948] flags: 0x2fffc0000000000() [ 25.136955] raw: 02fffc0000000000 0000000000000000 0000000000000000 00000000ffffffff [ 25.136960] raw: ffffea0007019ea0 ffffea0007022120 0000000000000000 0000000000000000 [ 25.136963] page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) <= 0) [ 25.137057] ------------[ cut here ]------------ [ 25.137060] kernel BUG at ./include/linux/mm.h:844! [ 25.137089] invalid opcode: 0000 [#1] SMP KASAN [ 25.137093] Dumping ftrace buffer: [ 25.137095] (ftrace buffer empty) [ 25.137097] Modules linked in: [ 25.137103] CPU: 0 PID: 3506 Comm: syzkaller160942 Not tainted 4.15.0-rc7+ #257 [ 25.137106] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.137116] RIP: 0010:mon_bin_vma_fault+0x2f4/0x400 [ 25.137119] RSP: 0018:ffff8801c086f510 EFLAGS: 00010203 [ 25.137122] RAX: 0000000000000000 RBX: 1ffff1003810dea4 RCX: 0000000000000000 [ 25.137125] RDX: 0000000000000000 RSI: 1ffff1003814add3 RDI: ffffed003810de90 [ 25.137127] RBP: ffff8801c086f5e8 R08: 1ffff1003810ddc6 R09: 0000000000000000 [ 25.137129] R10: dffffc0000000000 R11: 0000000000000000 R12: 1ffff1003810dea8 [ 25.137132] R13: dffffc0000000000 R14: ffff8801c086f840 R15: ffffea0007038040 [ 25.137136] FS: 00007fceecfad700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000 [ 25.137138] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 25.137141] CR2: 0000000020264000 CR3: 00000001c0881003 CR4: 00000000001606f0 [ 25.137145] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 25.137147] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 25.137149] Call Trace: [ 25.137156] ? mon_alloc_buff+0x1a0/0x1a0 [ 25.137165] ? finish_fault+0x1b4/0x2a0 [ 25.137172] ? lock_downgrade+0x980/0x980 [ 25.137177] ? do_swap_page+0x2c50/0x2c50 [ 25.137183] __do_fault+0xeb/0x30f [ 25.137189] ? pte_offset_kernel+0xc7/0xc7 [ 25.137197] ? check_noncircular+0x20/0x20 [ 25.137203] ? _raw_spin_unlock+0x22/0x30 [ 25.137210] __handle_mm_fault+0x1d8f/0x3ce0 [ 25.137216] ? __pmd_alloc+0x4e0/0x4e0 [ 25.137222] ? __save_stack_trace+0x7e/0xd0 [ 25.137229] ? find_held_lock+0x35/0x1d0 [ 25.137237] ? handle_mm_fault+0x248/0x8d0 [ 25.137242] ? lock_downgrade+0x980/0x980 [ 25.137257] handle_mm_fault+0x334/0x8d0 [ 25.137262] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 25.137267] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 25.137271] ? find_vma+0x30/0x150 [ 25.137279] __get_user_pages+0x50c/0x15f0 [ 25.137289] ? follow_page_mask+0x17f0/0x17f0 [ 25.137297] ? lock_acquire+0x1d5/0x580 [ 25.137300] ? lock_acquire+0x1d5/0x580 [ 25.137304] ? __mm_populate+0x2c7/0x450 [ 25.137311] ? lock_release+0xa40/0xa40 [ 25.137315] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 25.137322] ? rcu_note_context_switch+0x710/0x710 [ 25.137330] populate_vma_page_range+0x20e/0x2f0 [ 25.137335] ? get_user_pages+0xc0/0xc0 [ 25.137340] ? vmacache_find+0x5f/0x280 [ 25.137344] ? vmacache_update+0xfe/0x130 [ 25.137349] ? find_vma+0x30/0x150 [ 25.137354] __mm_populate+0x23a/0x450 [ 25.137361] ? populate_vma_page_range+0x2f0/0x2f0 [ 25.137365] ? down_read_killable+0x180/0x180 [ 25.137371] ? security_mmap_file+0x143/0x180 [ 25.137380] vm_mmap_pgoff+0x241/0x280 [ 25.137388] ? vma_is_stack_for_current+0xa0/0xa0 [ 25.137400] SyS_mmap_pgoff+0x462/0x5f0 [ 25.137407] ? find_mergeable_anon_vma+0xd0/0xd0 [ 25.137411] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.137418] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 25.137426] SyS_mmap+0x16/0x20 [ 25.137431] entry_SYSCALL_64_fastpath+0x23/0x9a [ 25.137434] RIP: 0033:0x449659 [ 25.137436] RSP: 002b:00007fceecfacd98 EFLAGS: 00000212 ORIG_RAX: 0000000000000009 [ 25.137440] RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000449659 [ 25.137442] RDX: 0000000001000004 RSI: 0000000000004000 RDI: 0000000020ac6000 [ 25.137444] RBP: 0000000000000000 R08: 0000000000000006 R09: 0000000000000000 [ 25.137446] R10: 0000000000008011 R11: 0000000000000212 R12: 00000000006dac20 [ 25.137449] R13: 6273752f7665642f R14: 00007fceecfad9c0 R15: 0000000000000005 [ 25.137458] Code: 00 44 89 e0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 41 bc 02 00 00 00 eb bb e8 cb 9c 94 fd 48 c7 c6 a0 b1 12 86 4c 89 ff e8 dc 89 bd fd <0f> 0b 48 89 95 28 ff ff ff 48 89 85 30 ff ff ff e8 a7 9c 94 fd [ 25.137532] RIP: mon_bin_vma_fault+0x2f4/0x400 RSP: ffff8801c086f510 [ 25.137539] ---[ end trace 7b41982eea98e944 ]--- [ 25.137542] Kernel panic - not syncing: Fatal exception [ 25.137955] Dumping ftrace buffer: [ 25.137957] (ftrace buffer empty) [ 25.137958] Kernel Offset: disabled [ 25.575041] Rebooting in 86400 seconds..