[....] Starting enhanced syslogd: rsyslogd[ 10.778456] audit: type=1400 audit(1514015757.767:5): avc: denied { syslog } for pid=2988 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 mcstransd: [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] 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: [ 16.235248] audit: type=1400 audit(1514015763.223:6): avc: denied { map } for pid=3128 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 'ci-upstream-kasan-gce-386-4,10.128.15.214' (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 executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 22.399699] audit: type=1400 audit(1514015769.388:7): avc: denied { map } for pid=3142 comm="syzkaller703910" path="/root/syzkaller703910460" 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 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 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 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 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 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 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 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 [ 25.556363] ================================================================== [ 25.563803] BUG: KASAN: use-after-free in disk_unblock_events+0x51/0x60 [ 25.570544] Read of size 8 at addr ffff8801c0c4d6c0 by task blkid/4088 [ 25.577190] [ 25.578806] CPU: 1 PID: 4088 Comm: blkid Not tainted 4.15.0-rc4+ #145 [ 25.585365] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 25.594706] Call Trace: [ 25.597286] dump_stack+0x194/0x257 [ 25.600913] ? arch_local_irq_restore+0x53/0x53 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 [ 25.605571] ? show_regs_print_info+0x18/0x18 [ 25.610064] ? kfree_const+0x31/0x40 [ 25.613773] ? disk_unblock_events+0x51/0x60 [ 25.618172] print_address_description+0x73/0x250 [ 25.623006] ? disk_unblock_events+0x51/0x60 [ 25.627404] kasan_report+0x25b/0x340 [ 25.631199] __asan_report_load8_noabort+0x14/0x20 [ 25.636117] disk_unblock_events+0x51/0x60 [ 25.640340] __blkdev_get+0x869/0x10e0 [ 25.644232] ? __blkdev_put+0x7f0/0x7f0 [ 25.648207] blkdev_get+0x3a1/0xad0 [ 25.651835] ? bd_link_disk_holder+0x8b0/0x8b0 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 [ 25.656402] ? do_raw_spin_trylock+0x190/0x190 [ 25.660977] ? errseq_sample+0xee/0x140 [ 25.664943] ? _copy_to_user+0xc0/0xc0 [ 25.668827] ? _raw_spin_unlock+0x22/0x30 [ 25.672974] blkdev_open+0x1c9/0x250 [ 25.676674] ? security_file_open+0x89/0x190 [ 25.681076] do_dentry_open+0x667/0xd40 [ 25.685047] ? bd_acquire+0x2c0/0x2c0 [ 25.688846] vfs_open+0x107/0x220 [ 25.692302] path_openat+0x1151/0x3530 [ 25.696199] ? path_lookupat+0xba0/0xba0 [ 25.700247] ? lock_downgrade+0x980/0x980 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 [ 25.704381] ? do_sys_open+0x2e7/0x6d0 [ 25.708271] ? find_held_lock+0x35/0x1d0 [ 25.712326] ? do_raw_spin_trylock+0x190/0x190 [ 25.716893] ? __lock_is_held+0xb6/0x140 [ 25.720943] ? _find_next_bit+0xee/0x120 [ 25.725010] ? _raw_spin_unlock+0x22/0x30 [ 25.729145] ? __alloc_fd+0x29b/0x750 [ 25.732951] do_filp_open+0x25b/0x3b0 [ 25.736745] ? may_open_dev+0xe0/0xe0 [ 25.740547] ? mpi_resize+0x200/0x200 [ 25.744346] ? get_unused_fd_flags+0x121/0x190 [ 25.748919] ? getname_flags+0x256/0x580 [ 25.752981] do_sys_open+0x502/0x6d0 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 [ 25.756680] ? do_sys_open+0x502/0x6d0 [ 25.760563] ? filp_open+0x70/0x70 [ 25.764090] ? entry_SYSCALL_64_fastpath+0x5/0x96 [ 25.768920] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 25.773936] SyS_open+0x2d/0x40 [ 25.777204] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 25.781941] RIP: 0033:0x7f847ae26120 [ 25.785634] RSP: 002b:00007ffef10dcc88 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 25.793328] RAX: ffffffffffffffda RBX: 00007f847b30787c RCX: 00007f847ae26120 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 [ 25.800585] RDX: 00007ffef10def45 RSI: 0000000000000000 RDI: 00007ffef10def45 [ 25.807839] RBP: 00007ffef10def3d R08: 0000000000000078 R09: 0000000000000000 [ 25.815097] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000403738 [ 25.822353] R13: 0000000000000001 R14: 0000000000000000 R15: 00007f847b0fca20 [ 25.829639] [ 25.831249] Allocated by task 4073: [ 25.834865] save_stack+0x43/0xd0 [ 25.838315] kasan_kmalloc+0xad/0xe0 [ 25.842022] kmem_cache_alloc_node_trace+0x150/0x750 [ 25.847112] __alloc_disk_node+0xb4/0x4e0 [ 25.852118] loop_add+0x44c/0xa70 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 [ 25.855557] loop_probe+0x16d/0x1a0 [ 25.859171] kobj_lookup+0x2ac/0x410 [ 25.862870] get_gendisk+0x37/0x2c0 [ 25.866483] __blkdev_get+0x3ea/0x10e0 [ 25.870367] blkdev_get+0x5ca/0xad0 [ 25.873978] blkdev_open+0x1c9/0x250 [ 25.877676] do_dentry_open+0x667/0xd40 [ 25.881637] vfs_open+0x107/0x220 [ 25.885078] path_openat+0x1151/0x3530 [ 25.888951] do_filp_open+0x25b/0x3b0 [ 25.892739] do_sys_open+0x502/0x6d0 [ 25.896442] compat_SyS_open+0x2a/0x40 [ 25.900317] do_fast_syscall_32+0x3ee/0xf9d 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 [ 25.904627] entry_SYSENTER_compat+0x54/0x63 [ 25.909012] [ 25.910619] Freed by task 4088: [ 25.913887] save_stack+0x43/0xd0 [ 25.917330] kasan_slab_free+0x71/0xc0 [ 25.921205] kfree+0xd6/0x260 [ 25.924292] disk_release+0x327/0x410 [ 25.928075] device_release+0x7c/0x210 [ 25.932293] kobject_put+0x14c/0x250 [ 25.935991] put_disk+0x23/0x30 [ 25.939255] __blkdev_get+0x7c9/0x10e0 [ 25.943140] blkdev_get+0x3a1/0xad0 [ 25.946749] blkdev_open+0x1c9/0x250 [ 25.950451] do_dentry_open+0x667/0xd40 [ 25.954410] vfs_open+0x107/0x220 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 [ 25.957848] path_openat+0x1151/0x3530 [ 25.961731] do_filp_open+0x25b/0x3b0 [ 25.965521] do_sys_open+0x502/0x6d0 [ 25.969216] SyS_open+0x2d/0x40 [ 25.972489] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 25.977221] [ 25.978839] The buggy address belongs to the object at ffff8801c0c4d140 [ 25.978839] which belongs to the cache kmalloc-2048 of size 2048 [ 25.991654] The buggy address is located 1408 bytes inside of [ 25.991654] 2048-byte region [ffff8801c0c4d140, ffff8801c0c4d940) 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 [ 26.003685] The buggy address belongs to the page: [ 26.008600] page:00000000a59c3557 count:1 mapcount:0 mapping:0000000067c7572a index:0x0 compound_mapcount: 0 [ 26.018559] flags: 0x2fffc0000008100(slab|head) [ 26.023216] raw: 02fffc0000008100 ffff8801c0c4c040 0000000000000000 0000000100000003 [ 26.031090] raw: ffffea0007033aa0 ffffea0007030320 ffff8801db000c40 0000000000000000 [ 26.038960] page dumped because: kasan: bad access detected [ 26.044655] [ 26.046271] Memory state around the buggy address: [ 26.051192] ffff8801c0c4d580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb 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 [ 26.058539] ffff8801c0c4d600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.065887] >ffff8801c0c4d680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.073229] ^ [ 26.078662] ffff8801c0c4d700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.086008] ffff8801c0c4d780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 26.093527] ================================================================== [ 26.100872] Disabling lock debugging due to kernel taint 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 [ 26.106390] Kernel panic - not syncing: panic_on_warn set ... [ 26.106390] [ 26.113737] CPU: 1 PID: 4088 Comm: blkid Tainted: G B 4.15.0-rc4+ #145 [ 26.121599] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 26.131543] Call Trace: [ 26.134126] dump_stack+0x194/0x257 [ 26.137750] ? arch_local_irq_restore+0x53/0x53 [ 26.142405] ? kasan_end_report+0x32/0x50 [ 26.146541] ? trace_hardirqs_on_thunk+0x1a/0x1c [ 26.151286] ? vsnprintf+0x1ed/0x1900 [ 26.155079] ? del_gendisk+0x9e0/0xa40 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 [ 26.158951] panic+0x1e4/0x41c [ 26.162136] ? refcount_error_report+0x214/0x214 [ 26.166887] ? add_taint+0x1c/0x50 [ 26.170420] ? add_taint+0x1c/0x50 [ 26.173952] ? disk_unblock_events+0x51/0x60 [ 26.178348] kasan_end_report+0x50/0x50 [ 26.182313] kasan_report+0x144/0x340 [ 26.186115] __asan_report_load8_noabort+0x14/0x20 [ 26.191033] disk_unblock_events+0x51/0x60 [ 26.195256] __blkdev_get+0x869/0x10e0 [ 26.199138] ? __blkdev_put+0x7f0/0x7f0 [ 26.203108] blkdev_get+0x3a1/0xad0 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 [ 26.206728] ? bd_link_disk_holder+0x8b0/0x8b0 [ 26.211296] ? do_raw_spin_trylock+0x190/0x190 [ 26.215867] ? errseq_sample+0xee/0x140 [ 26.219833] ? _copy_to_user+0xc0/0xc0 [ 26.223727] ? _raw_spin_unlock+0x22/0x30 [ 26.227866] blkdev_open+0x1c9/0x250 [ 26.231568] ? security_file_open+0x89/0x190 [ 26.235966] do_dentry_open+0x667/0xd40 [ 26.239934] ? bd_acquire+0x2c0/0x2c0 [ 26.243725] vfs_open+0x107/0x220 [ 26.247167] path_openat+0x1151/0x3530 [ 26.251046] ? path_lookupat+0xba0/0xba0 [ 26.255092] ? lock_downgrade+0x980/0x980 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 [ 26.259242] ? do_sys_open+0x2e7/0x6d0 [ 26.263116] ? find_held_lock+0x35/0x1d0 [ 26.267161] ? do_raw_spin_trylock+0x190/0x190 [ 26.271727] ? __lock_is_held+0xb6/0x140 [ 26.275775] ? _find_next_bit+0xee/0x120 [ 26.279831] ? _raw_spin_unlock+0x22/0x30 [ 26.283968] ? __alloc_fd+0x29b/0x750 [ 26.287764] do_filp_open+0x25b/0x3b0 [ 26.291552] ? may_open_dev+0xe0/0xe0 [ 26.295345] ? mpi_resize+0x200/0x200 [ 26.299133] ? get_unused_fd_flags+0x121/0x190 [ 26.303703] ? getname_flags+0x256/0x580 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 [ 26.307755] do_sys_open+0x502/0x6d0 [ 26.311456] ? do_sys_open+0x502/0x6d0 [ 26.315340] ? filp_open+0x70/0x70 [ 26.318874] ? entry_SYSCALL_64_fastpath+0x5/0x96 [ 26.323708] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 26.328718] SyS_open+0x2d/0x40 [ 26.331983] entry_SYSCALL_64_fastpath+0x1f/0x96 [ 26.336727] RIP: 0033:0x7f847ae26120 [ 26.340423] RSP: 002b:00007ffef10dcc88 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 26.348115] RAX: ffffffffffffffda RBX: 00007f847b30787c RCX: 00007f847ae26120 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 26.355373] RDX: 00007ffef10def45 RSI: 0000000000000000 RDI: 00007ffef10def45 [ 26.362627] RBP: 00007ffef10def3d R08: 0000000000000078 R09: 0000000000000000 [ 26.369880] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000403738 [ 26.377139] R13: 0000000000000001 R14: 0000000000000000 R15: 00007f847b0fca20 [ 26.384771] Dumping ftrace buffer: [ 26.388290] (ftrace buffer empty) [ 26.391962] Kernel Offset: disabled [ 26.395554] Rebooting in 86400 seconds..