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 '10.128.10.34' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 41.441288] ================================================================== [ 41.448693] BUG: KMSAN: uninit-value in pointer+0x11e5/0x1410 [ 41.454564] CPU: 1 PID: 4535 Comm: syz-executor113 Not tainted 4.16.0+ #87 [ 41.461556] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.470897] Call Trace: [ 41.473478] dump_stack+0x185/0x1d0 [ 41.477095] ? pointer+0x11e5/0x1410 [ 41.480798] kmsan_report+0x142/0x240 [ 41.484585] __msan_warning_32+0x6c/0xb0 [ 41.488646] ? futex_wait_queue_me+0x401/0x710 [ 41.493218] pointer+0x11e5/0x1410 [ 41.496745] ? futex_wait_queue_me+0x476/0x710 [ 41.501308] vsnprintf+0xa2d/0x33c0 [ 41.504931] seq_printf+0x29f/0x420 [ 41.508552] ? save_stack_trace_tsk+0x26a/0x2f0 [ 41.513200] ? futex_wait_queue_me+0x476/0x710 [ 41.517771] ? futex_wait_queue_me+0x476/0x710 [ 41.522332] ? futex_wait_queue_me+0x476/0x710 [ 41.526892] proc_pid_stack+0x326/0x470 [ 41.530848] proc_single_show+0x1af/0x300 [ 41.534977] ? proc_pid_wchan+0x250/0x250 [ 41.539122] ? proc_single_open+0x90/0x90 [ 41.543247] seq_read+0xc7d/0x2260 [ 41.546778] ? __vfs_read+0xc9/0x9b0 [ 41.550476] ? seq_open+0x360/0x360 [ 41.554083] __vfs_read+0x1a5/0x9b0 [ 41.557694] vfs_read+0x36c/0x6c0 [ 41.561130] SYSC_pread64+0x275/0x310 [ 41.564910] SyS_pread64+0x65/0x90 [ 41.568429] do_syscall_64+0x309/0x430 [ 41.572304] ? SYSC_write+0x360/0x360 [ 41.576086] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 41.581281] RIP: 0033:0x445519 [ 41.584455] RSP: 002b:00007fbfe6580d18 EFLAGS: 00000246 ORIG_RAX: 0000000000000011 [ 41.592148] RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000445519 [ 41.599408] RDX: 00000000ffffff72 RSI: 0000000020003c00 RDI: 0000000000000003 [ 41.606674] RBP: 0000000000000000 R08: 65732f636f72702f R09: 65732f636f72702f [ 41.613933] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbfe6580d20 [ 41.621187] R13: 00000000006dac20 R14: 0000000000000000 R15: 0000000000000001 [ 41.628436] [ 41.630043] Uninit was stored to memory at: [ 41.634357] kmsan_internal_chain_origin+0x12b/0x210 [ 41.639455] __msan_chain_origin+0x69/0xc0 [ 41.643670] __save_stack_trace+0x829/0xb00 [ 41.647988] save_stack_trace_tsk+0x258/0x2f0 [ 41.652471] proc_pid_stack+0x26a/0x470 [ 41.656424] proc_single_show+0x1af/0x300 [ 41.660550] seq_read+0xc7d/0x2260 [ 41.664069] __vfs_read+0x1a5/0x9b0 [ 41.667674] vfs_read+0x36c/0x6c0 [ 41.671118] SYSC_pread64+0x275/0x310 [ 41.674910] SyS_pread64+0x65/0x90 [ 41.678442] do_syscall_64+0x309/0x430 [ 41.682317] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 41.687572] Uninit was stored to memory at: [ 41.691890] kmsan_internal_chain_origin+0x12b/0x210 [ 41.696974] __msan_chain_origin+0x69/0xc0 [ 41.701191] update_stack_state+0x959/0xa40 [ 41.705493] unwind_next_frame+0x618/0xe50 [ 41.709732] __save_stack_trace+0x734/0xb00 [ 41.714051] save_stack_trace_tsk+0x258/0x2f0 [ 41.719122] proc_pid_stack+0x26a/0x470 [ 41.723088] proc_single_show+0x1af/0x300 [ 41.727236] seq_read+0xc7d/0x2260 [ 41.730759] __vfs_read+0x1a5/0x9b0 [ 41.734375] vfs_read+0x36c/0x6c0 [ 41.737813] SYSC_pread64+0x275/0x310 [ 41.741595] SyS_pread64+0x65/0x90 [ 41.745125] do_syscall_64+0x309/0x430 [ 41.749002] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 41.754177] Local variable description: ----flags.i.i.i@rcu_all_qs [ 41.760471] Variable was created at: [ 41.764170] rcu_all_qs+0x32/0x1f0 [ 41.767691] _cond_resched+0x3c/0xd0 [ 41.771377] ================================================================== [ 41.778708] Disabling lock debugging due to kernel taint [ 41.784145] Kernel panic - not syncing: panic_on_warn set ... [ 41.784145] [ 41.791497] CPU: 1 PID: 4535 Comm: syz-executor113 Tainted: G B 4.16.0+ #87 [ 41.799912] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 41.809253] Call Trace: [ 41.811851] dump_stack+0x185/0x1d0 [ 41.815470] panic+0x39d/0x940 [ 41.818663] ? pointer+0x11e5/0x1410 [ 41.822364] kmsan_report+0x238/0x240 [ 41.826154] __msan_warning_32+0x6c/0xb0 [ 41.830211] ? futex_wait_queue_me+0x401/0x710 [ 41.834779] pointer+0x11e5/0x1410 [ 41.838307] ? futex_wait_queue_me+0x476/0x710 [ 41.842963] vsnprintf+0xa2d/0x33c0 [ 41.846581] seq_printf+0x29f/0x420 [ 41.850203] ? save_stack_trace_tsk+0x26a/0x2f0 [ 41.854861] ? futex_wait_queue_me+0x476/0x710 [ 41.859432] ? futex_wait_queue_me+0x476/0x710 [ 41.864004] ? futex_wait_queue_me+0x476/0x710 [ 41.868607] proc_pid_stack+0x326/0x470 [ 41.872579] proc_single_show+0x1af/0x300 [ 41.876707] ? proc_pid_wchan+0x250/0x250 [ 41.880841] ? proc_single_open+0x90/0x90 [ 41.884989] seq_read+0xc7d/0x2260 [ 41.888521] ? __vfs_read+0xc9/0x9b0 [ 41.892220] ? seq_open+0x360/0x360 [ 41.895836] __vfs_read+0x1a5/0x9b0 [ 41.899463] vfs_read+0x36c/0x6c0 [ 41.902901] SYSC_pread64+0x275/0x310 [ 41.906778] SyS_pread64+0x65/0x90 [ 41.910300] do_syscall_64+0x309/0x430 [ 41.914169] ? SYSC_write+0x360/0x360 [ 41.917975] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 41.923144] RIP: 0033:0x445519 [ 41.926312] RSP: 002b:00007fbfe6580d18 EFLAGS: 00000246 ORIG_RAX: 0000000000000011 [ 41.934007] RAX: ffffffffffffffda RBX: 00000000006dac24 RCX: 0000000000445519 [ 41.941274] RDX: 00000000ffffff72 RSI: 0000000020003c00 RDI: 0000000000000003 [ 41.948532] RBP: 0000000000000000 R08: 65732f636f72702f R09: 65732f636f72702f [ 41.955802] R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbfe6580d20 [ 41.963074] R13: 00000000006dac20 R14: 0000000000000000 R15: 0000000000000001 [ 41.970793] Dumping ftrace buffer: [ 41.974320] (ftrace buffer empty) [ 41.978022] Kernel Offset: disabled [ 41.981910] Rebooting in 86400 seconds..