[info] Using makefile-style concurrent boot in runlevel 2. [ 18.423537] bootlogs (3411) used greatest stack depth: 54784 bytes left [....] 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 '10.128.0.35' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 42.309167] ================================================================== [ 42.316558] BUG: KMSAN: uninit-value in crc_t10dif_generic+0x155/0x1b0 [ 42.323203] CPU: 1 PID: 3567 Comm: syzkaller396147 Not tainted 4.16.0+ #83 [ 42.330193] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.339532] Call Trace: [ 42.342101] dump_stack+0x185/0x1d0 [ 42.345714] ? crc_t10dif_generic+0x155/0x1b0 [ 42.350188] kmsan_report+0x142/0x240 [ 42.353973] __msan_warning_32+0x6c/0xb0 [ 42.358015] crc_t10dif_generic+0x155/0x1b0 [ 42.362317] chksum_finup+0xc6/0x150 [ 42.366010] ? chksum_final+0xe0/0xe0 [ 42.369791] shash_ahash_finup+0x468/0xa30 [ 42.374011] shash_ahash_digest+0x5c6/0x600 [ 42.378314] shash_async_digest+0x11c/0x1b0 [ 42.382614] crypto_ahash_op+0x89a/0xc10 [ 42.386655] ? __kmalloc+0x23c/0x350 [ 42.390349] ? shash_async_finup+0x1b0/0x1b0 [ 42.394740] ? shash_async_finup+0x1b0/0x1b0 [ 42.399135] crypto_ahash_digest+0xe4/0x160 [ 42.403441] hash_sendpage+0xb40/0xe10 [ 42.407308] ? hash_recvmsg+0xd50/0xd50 [ 42.411261] sock_sendpage+0x1de/0x2c0 [ 42.415131] pipe_to_sendpage+0x31b/0x430 [ 42.419256] ? sock_fasync+0x2b0/0x2b0 [ 42.423126] ? propagate_umount+0x3a30/0x3a30 [ 42.427599] __splice_from_pipe+0x49a/0xf30 [ 42.431906] ? generic_splice_sendpage+0x2a0/0x2a0 [ 42.436821] ? __msan_metadata_ptr_for_load_4+0x10/0x20 [ 42.442162] generic_splice_sendpage+0x1c6/0x2a0 [ 42.446903] ? iter_file_splice_write+0x1710/0x1710 [ 42.451899] ? iter_file_splice_write+0x1710/0x1710 [ 42.456897] direct_splice_actor+0x19b/0x200 [ 42.461289] splice_direct_to_actor+0x764/0x1040 [ 42.466024] ? do_splice_direct+0x540/0x540 [ 42.470326] ? security_file_permission+0x28f/0x4b0 [ 42.475332] ? rw_verify_area+0x35e/0x580 [ 42.479470] do_splice_direct+0x335/0x540 [ 42.483604] do_sendfile+0x1067/0x1e40 [ 42.487480] SYSC_sendfile64+0x1b3/0x300 [ 42.491521] SyS_sendfile64+0x64/0x90 [ 42.495303] do_syscall_64+0x309/0x430 [ 42.499175] ? SYSC_sendfile+0x320/0x320 [ 42.503228] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 42.508396] RIP: 0033:0x440c19 [ 42.511573] RSP: 002b:00000000007dff78 EFLAGS: 00000217 ORIG_RAX: 0000000000000028 [ 42.519260] RAX: ffffffffffffffda RBX: 00007fffe8f64eb0 RCX: 0000000000440c19 [ 42.526511] RDX: 0000000020e64ff8 RSI: 0000000000000005 RDI: 0000000000000004 [ 42.533763] RBP: 0000000000000000 R08: 0000000120080522 R09: 0000000120080522 [ 42.541010] R10: 0000000000000008 R11: 0000000000000217 R12: 00000000004023b0 [ 42.548258] R13: 0000000000402440 R14: 0000000000000000 R15: 0000000000000000 [ 42.555511] [ 42.557117] Uninit was created at: [ 42.560642] kmsan_alloc_meta_for_pages+0x161/0x3a0 [ 42.565636] kmsan_alloc_page+0x82/0xe0 [ 42.569592] __alloc_pages_nodemask+0xf5b/0x5dc0 [ 42.574327] alloc_pages_vma+0xcc8/0x1800 [ 42.578455] shmem_alloc_and_acct_page+0x6d5/0x1000 [ 42.583452] shmem_getpage_gfp+0x35db/0x5770 [ 42.587843] shmem_fallocate+0xde2/0x1610 [ 42.591970] vfs_fallocate+0x9dc/0xde0 [ 42.595832] SYSC_fallocate+0x119/0x1d0 [ 42.599787] SyS_fallocate+0x64/0x90 [ 42.603480] do_syscall_64+0x309/0x430 [ 42.607347] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 42.612512] ================================================================== [ 42.619843] Disabling lock debugging due to kernel taint [ 42.625267] Kernel panic - not syncing: panic_on_warn set ... [ 42.625267] [ 42.632610] CPU: 1 PID: 3567 Comm: syzkaller396147 Tainted: G B 4.16.0+ #83 [ 42.640898] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 42.650228] Call Trace: [ 42.652796] dump_stack+0x185/0x1d0 [ 42.656401] panic+0x39d/0x940 [ 42.659584] ? crc_t10dif_generic+0x155/0x1b0 [ 42.664057] kmsan_report+0x238/0x240 [ 42.667839] __msan_warning_32+0x6c/0xb0 [ 42.671877] crc_t10dif_generic+0x155/0x1b0 [ 42.676180] chksum_finup+0xc6/0x150 [ 42.679872] ? chksum_final+0xe0/0xe0 [ 42.683650] shash_ahash_finup+0x468/0xa30 [ 42.687868] shash_ahash_digest+0x5c6/0x600 [ 42.692171] shash_async_digest+0x11c/0x1b0 [ 42.696472] crypto_ahash_op+0x89a/0xc10 [ 42.700514] ? __kmalloc+0x23c/0x350 [ 42.704212] ? shash_async_finup+0x1b0/0x1b0 [ 42.708603] ? shash_async_finup+0x1b0/0x1b0 [ 42.712991] crypto_ahash_digest+0xe4/0x160 [ 42.717289] hash_sendpage+0xb40/0xe10 [ 42.721155] ? hash_recvmsg+0xd50/0xd50 [ 42.725115] sock_sendpage+0x1de/0x2c0 [ 42.728998] pipe_to_sendpage+0x31b/0x430 [ 42.733127] ? sock_fasync+0x2b0/0x2b0 [ 42.736997] ? propagate_umount+0x3a30/0x3a30 [ 42.741469] __splice_from_pipe+0x49a/0xf30 [ 42.745769] ? generic_splice_sendpage+0x2a0/0x2a0 [ 42.750685] ? __msan_metadata_ptr_for_load_4+0x10/0x20 [ 42.756033] generic_splice_sendpage+0x1c6/0x2a0 [ 42.760773] ? iter_file_splice_write+0x1710/0x1710 [ 42.765771] ? iter_file_splice_write+0x1710/0x1710 [ 42.770766] direct_splice_actor+0x19b/0x200 [ 42.775157] splice_direct_to_actor+0x764/0x1040 [ 42.779904] ? do_splice_direct+0x540/0x540 [ 42.784210] ? security_file_permission+0x28f/0x4b0 [ 42.789206] ? rw_verify_area+0x35e/0x580 [ 42.793334] do_splice_direct+0x335/0x540 [ 42.797462] do_sendfile+0x1067/0x1e40 [ 42.801332] SYSC_sendfile64+0x1b3/0x300 [ 42.805377] SyS_sendfile64+0x64/0x90 [ 42.809156] do_syscall_64+0x309/0x430 [ 42.813031] ? SYSC_sendfile+0x320/0x320 [ 42.817075] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 42.822241] RIP: 0033:0x440c19 [ 42.825409] RSP: 002b:00000000007dff78 EFLAGS: 00000217 ORIG_RAX: 0000000000000028 [ 42.833100] RAX: ffffffffffffffda RBX: 00007fffe8f64eb0 RCX: 0000000000440c19 [ 42.840348] RDX: 0000000020e64ff8 RSI: 0000000000000005 RDI: 0000000000000004 [ 42.847594] RBP: 0000000000000000 R08: 0000000120080522 R09: 0000000120080522 [ 42.854841] R10: 0000000000000008 R11: 0000000000000217 R12: 00000000004023b0 [ 42.862089] R13: 0000000000402440 R14: 0000000000000000 R15: 0000000000000000 [ 42.869745] Dumping ftrace buffer: [ 42.873261] (ftrace buffer empty) [ 42.876953] Kernel Offset: disabled [ 42.880563] Rebooting in 86400 seconds..