[....] Starting enhanced syslogd: rsyslogd[ 11.324990] audit: type=1400 audit(1516082430.942:4): avc: denied { syslog } for pid=3180 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 Warning: Permanently added '10.128.0.29' (ECDSA) to the list of known hosts. executing program executing program executing program executing program syzkaller login: [ 38.677994] ================================================================== [ 38.679137] BUG: KASAN: slab-out-of-bounds in sg_remove_request+0x103/0x120 [ 38.680098] Read of size 8 at addr ffff8801c8024340 by task syzkaller140590/3349 [ 38.681095] [ 38.681332] CPU: 1 PID: 3349 Comm: syzkaller140590 Not tainted 4.9.76-g8dec074 #23 [ 38.682341] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.683609] ffff8801c9d47a50 ffffffff81d93169 ffffea0007200900 ffff8801c8024340 [ 38.684831] 0000000000000000 ffff8801c8024340 ffff8801c9c28238 ffff8801c9d47a88 [ 38.685979] ffffffff8153cb43 ffff8801c8024340 0000000000000008 0000000000000000 [ 38.687214] Call Trace: [ 38.687577] [] dump_stack+0xc1/0x128 [ 38.688292] [] print_address_description+0x73/0x280 [ 38.689172] [] kasan_report+0x275/0x360 [ 38.689927] [] ? sg_remove_request+0x103/0x120 [ 38.690751] [] __asan_report_load8_noabort+0x14/0x20 [ 38.691666] [] sg_remove_request+0x103/0x120 [ 38.692499] [] sg_finish_rem_req+0x295/0x340 [ 38.693315] [] sg_read+0xa1c/0x1440 [ 38.694026] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 38.694970] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 38.695959] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 38.696840] [] __vfs_read+0x103/0x670 [ 38.697565] [] ? default_llseek+0x290/0x290 [ 38.698386] [] ? fsnotify+0x86/0xf30 [ 38.703721] [] ? fsnotify+0xf30/0xf30 [ 38.709155] [] ? avc_policy_seqno+0x9/0x20 [ 38.715008] [] ? selinux_file_permission+0x82/0x460 [ 38.721652] [] ? security_file_permission+0x89/0x1e0 [ 38.728376] [] ? rw_verify_area+0xe5/0x2b0 [ 38.734232] [] vfs_read+0x11e/0x380 [ 38.739477] [] SyS_read+0xd9/0x1b0 [ 38.744636] [] ? vfs_copy_file_range+0x740/0x740 [ 38.751012] [] ? do_fast_syscall_32+0xcf/0x890 [ 38.757215] [] ? vfs_copy_file_range+0x740/0x740 [ 38.763591] [] do_fast_syscall_32+0x2f7/0x890 [ 38.769707] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.776345] [] entry_SYSENTER_compat+0x74/0x83 [ 38.782550] [ 38.784145] Allocated by task 0: [ 38.787478] (stack is not available) [ 38.791156] [ 38.792750] Freed by task 0: [ 38.795736] (stack is not available) [ 38.799415] [ 38.801014] The buggy address belongs to the object at ffff8801c8024300 [ 38.801014] which belongs to the cache fasync_cache of size 96 [ 38.813642] The buggy address is located 64 bytes inside of [ 38.813642] 96-byte region [ffff8801c8024300, ffff8801c8024360) [ 38.825311] The buggy address belongs to the page: [ 38.830211] page:ffffea0007200900 count:1 mapcount:0 mapping: (null) index:0x0 [ 38.838455] flags: 0x8000000000000080(slab) [ 38.842754] page dumped because: kasan: bad access detected [ 38.848433] [ 38.850027] Memory state around the buggy address: [ 38.854933] ffff8801c8024200: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc [ 38.862260] ffff8801c8024280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 38.869590] >ffff8801c8024300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 38.876916] ^ [ 38.882334] ffff8801c8024380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 38.889661] ffff8801c8024400: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 38.897002] ================================================================== [ 38.904328] Disabling lock debugging due to kernel taint [ 38.910648] Kernel panic - not syncing: panic_on_warn set ... [ 38.910648] [ 38.918001] CPU: 1 PID: 3349 Comm: syzkaller140590 Tainted: G B 4.9.76-g8dec074 #23 [ 38.926912] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.936936] ffff8801c9d479a8 ffffffff81d93169 ffffffff84195c2f ffff8801c9d47a80 [ 38.944909] 0000000000000000 ffff8801c8024340 ffff8801c9c28238 ffff8801c9d47a70 [ 38.952889] ffffffff8142e371 0000000041b58ab3 ffffffff84189690 ffffffff8142e1b5 [ 38.960853] Call Trace: [ 38.963413] [] dump_stack+0xc1/0x128 [ 38.968757] [] panic+0x1bc/0x3a8 [ 38.973743] [] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7 [ 38.981945] [] ? preempt_schedule+0x25/0x30 [ 38.987885] [] ? ___preempt_schedule+0x16/0x18 [ 38.994106] [] kasan_end_report+0x50/0x50 [ 38.999905] [] kasan_report+0x167/0x360 [ 39.005499] [] ? sg_remove_request+0x103/0x120 [ 39.011702] [] __asan_report_load8_noabort+0x14/0x20 [ 39.018424] [] sg_remove_request+0x103/0x120 [ 39.024453] [] sg_finish_rem_req+0x295/0x340 [ 39.030480] [] sg_read+0xa1c/0x1440 [ 39.035726] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 39.042367] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 39.049369] [] ? sg_proc_seq_show_debug+0xd10/0xd10 [ 39.056007] [] __vfs_read+0x103/0x670 [ 39.061434] [] ? default_llseek+0x290/0x290 [ 39.067380] [] ? fsnotify+0x86/0xf30 [ 39.072789] [] ? fsnotify+0xf30/0xf30 [ 39.078211] [] ? avc_policy_seqno+0x9/0x20 [ 39.084064] [] ? selinux_file_permission+0x82/0x460 [ 39.090700] [] ? security_file_permission+0x89/0x1e0 [ 39.097423] [] ? rw_verify_area+0xe5/0x2b0 [ 39.103278] [] vfs_read+0x11e/0x380 [ 39.108523] [] SyS_read+0xd9/0x1b0 [ 39.113683] [] ? vfs_copy_file_range+0x740/0x740 [ 39.120059] [] ? do_fast_syscall_32+0xcf/0x890 [ 39.126263] [] ? vfs_copy_file_range+0x740/0x740 [ 39.132639] [] do_fast_syscall_32+0x2f7/0x890 [ 39.138752] [] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 39.145399] [] entry_SYSENTER_compat+0x74/0x83 [ 39.151999] Dumping ftrace buffer: [ 39.155510] (ftrace buffer empty) [ 39.159189] Kernel Offset: disabled [ 39.162785] Rebooting in 86400 seconds..