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 '10.128.0.39' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 31.477421] ================================================================== [ 31.484816] BUG: KMSAN: uninit-value in __crc32c_pcl_intel_finup+0x3b2/0x4b0 [ 31.491983] CPU: 1 PID: 3568 Comm: syzkaller917620 Not tainted 4.16.0+ #83 [ 31.498973] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.508326] Call Trace: [ 31.510898] dump_stack+0x185/0x1d0 [ 31.514507] ? __crc32c_pcl_intel_finup+0x3b2/0x4b0 [ 31.519504] kmsan_report+0x142/0x240 [ 31.523411] __msan_warning_32+0x6c/0xb0 [ 31.527456] __crc32c_pcl_intel_finup+0x3b2/0x4b0 [ 31.532280] crc32c_pcl_intel_finup+0xb5/0xe0 [ 31.536766] ? crc32c_pcl_intel_update+0x500/0x500 [ 31.541690] shash_ahash_finup+0x468/0xa30 [ 31.545908] shash_ahash_digest+0x5c6/0x600 [ 31.550213] shash_async_digest+0x11c/0x1b0 [ 31.554515] crypto_ahash_op+0x89a/0xc10 [ 31.558557] ? __kmalloc+0x23c/0x350 [ 31.562251] ? shash_async_finup+0x1b0/0x1b0 [ 31.566648] ? shash_async_finup+0x1b0/0x1b0 [ 31.571037] crypto_ahash_digest+0xe4/0x160 [ 31.575340] hash_sendpage+0xb40/0xe10 [ 31.579207] ? hash_recvmsg+0xd50/0xd50 [ 31.583161] sock_sendpage+0x1de/0x2c0 [ 31.587036] pipe_to_sendpage+0x31b/0x430 [ 31.591165] ? sock_fasync+0x2b0/0x2b0 [ 31.595036] ? propagate_umount+0x3a30/0x3a30 [ 31.599512] __splice_from_pipe+0x49a/0xf30 [ 31.603816] ? generic_splice_sendpage+0x2a0/0x2a0 [ 31.608731] ? __msan_metadata_ptr_for_load_4+0x10/0x20 [ 31.614090] generic_splice_sendpage+0x1c6/0x2a0 [ 31.618833] ? iter_file_splice_write+0x1710/0x1710 [ 31.623832] ? iter_file_splice_write+0x1710/0x1710 [ 31.628830] direct_splice_actor+0x19b/0x200 [ 31.633225] splice_direct_to_actor+0x764/0x1040 [ 31.637963] ? do_splice_direct+0x540/0x540 [ 31.642272] ? security_file_permission+0x28f/0x4b0 [ 31.647274] ? rw_verify_area+0x35e/0x580 [ 31.651407] do_splice_direct+0x335/0x540 [ 31.655544] do_sendfile+0x1067/0x1e40 [ 31.659420] SYSC_sendfile64+0x1b3/0x300 [ 31.663471] SyS_sendfile64+0x64/0x90 [ 31.667253] do_syscall_64+0x309/0x430 [ 31.671126] ? SYSC_sendfile+0x320/0x320 [ 31.675169] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 31.680339] RIP: 0033:0x440c19 [ 31.683507] RSP: 002b:00000000007dff78 EFLAGS: 00000217 ORIG_RAX: 0000000000000028 [ 31.691192] RAX: ffffffffffffffda RBX: 00007ffdc393df40 RCX: 0000000000440c19 [ 31.698443] RDX: 0000000020000240 RSI: 0000000000000005 RDI: 0000000000000004 [ 31.705695] RBP: 0000000000000000 R08: 0000000120080522 R09: 0000000120080522 [ 31.712949] R10: 0000000000000006 R11: 0000000000000217 R12: 00000000004023b0 [ 31.720212] R13: 0000000000402440 R14: 0000000000000000 R15: 0000000000000000 [ 31.727467] [ 31.729074] Uninit was created at: [ 31.732605] kmsan_alloc_meta_for_pages+0x161/0x3a0 [ 31.737614] kmsan_alloc_page+0x82/0xe0 [ 31.741578] __alloc_pages_nodemask+0xf5b/0x5dc0 [ 31.746312] alloc_pages_vma+0xcc8/0x1800 [ 31.750441] shmem_alloc_and_acct_page+0x6d5/0x1000 [ 31.755436] shmem_getpage_gfp+0x35db/0x5770 [ 31.759830] shmem_fallocate+0xde2/0x1610 [ 31.763957] vfs_fallocate+0x9dc/0xde0 [ 31.767831] SYSC_fallocate+0x119/0x1d0 [ 31.771794] SyS_fallocate+0x64/0x90 [ 31.775487] do_syscall_64+0x309/0x430 [ 31.779360] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 31.784526] ================================================================== [ 31.791860] Disabling lock debugging due to kernel taint [ 31.797285] Kernel panic - not syncing: panic_on_warn set ... [ 31.797285] [ 31.804641] CPU: 1 PID: 3568 Comm: syzkaller917620 Tainted: G B 4.16.0+ #83 [ 31.812933] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.822267] Call Trace: [ 31.824841] dump_stack+0x185/0x1d0 [ 31.828447] panic+0x39d/0x940 [ 31.831634] ? __crc32c_pcl_intel_finup+0x3b2/0x4b0 [ 31.836633] kmsan_report+0x238/0x240 [ 31.840419] __msan_warning_32+0x6c/0xb0 [ 31.844475] __crc32c_pcl_intel_finup+0x3b2/0x4b0 [ 31.849316] crc32c_pcl_intel_finup+0xb5/0xe0 [ 31.853801] ? crc32c_pcl_intel_update+0x500/0x500 [ 31.858713] shash_ahash_finup+0x468/0xa30 [ 31.862936] shash_ahash_digest+0x5c6/0x600 [ 31.867240] shash_async_digest+0x11c/0x1b0 [ 31.871547] crypto_ahash_op+0x89a/0xc10 [ 31.875592] ? __kmalloc+0x23c/0x350 [ 31.879285] ? shash_async_finup+0x1b0/0x1b0 [ 31.883673] ? shash_async_finup+0x1b0/0x1b0 [ 31.888062] crypto_ahash_digest+0xe4/0x160 [ 31.892365] hash_sendpage+0xb40/0xe10 [ 31.896240] ? hash_recvmsg+0xd50/0xd50 [ 31.900195] sock_sendpage+0x1de/0x2c0 [ 31.904832] pipe_to_sendpage+0x31b/0x430 [ 31.909000] ? sock_fasync+0x2b0/0x2b0 [ 31.912900] ? propagate_umount+0x3a30/0x3a30 [ 31.917425] __splice_from_pipe+0x49a/0xf30 [ 31.921747] ? generic_splice_sendpage+0x2a0/0x2a0 [ 31.926661] ? __msan_metadata_ptr_for_load_4+0x10/0x20 [ 31.932009] generic_splice_sendpage+0x1c6/0x2a0 [ 31.936749] ? iter_file_splice_write+0x1710/0x1710 [ 31.941746] ? iter_file_splice_write+0x1710/0x1710 [ 31.946742] direct_splice_actor+0x19b/0x200 [ 31.951136] splice_direct_to_actor+0x764/0x1040 [ 31.955870] ? do_splice_direct+0x540/0x540 [ 31.960174] ? security_file_permission+0x28f/0x4b0 [ 31.965172] ? rw_verify_area+0x35e/0x580 [ 31.969303] do_splice_direct+0x335/0x540 [ 31.973435] do_sendfile+0x1067/0x1e40 [ 31.977323] SYSC_sendfile64+0x1b3/0x300 [ 31.981378] SyS_sendfile64+0x64/0x90 [ 31.985160] do_syscall_64+0x309/0x430 [ 31.989038] ? SYSC_sendfile+0x320/0x320 [ 31.993099] entry_SYSCALL_64_after_hwframe+0x3d/0xa2 [ 31.998275] RIP: 0033:0x440c19 [ 32.001444] RSP: 002b:00000000007dff78 EFLAGS: 00000217 ORIG_RAX: 0000000000000028 [ 32.009133] RAX: ffffffffffffffda RBX: 00007ffdc393df40 RCX: 0000000000440c19 [ 32.016383] RDX: 0000000020000240 RSI: 0000000000000005 RDI: 0000000000000004 [ 32.023639] RBP: 0000000000000000 R08: 0000000120080522 R09: 0000000120080522 [ 32.030890] R10: 0000000000000006 R11: 0000000000000217 R12: 00000000004023b0 [ 32.038145] R13: 0000000000402440 R14: 0000000000000000 R15: 0000000000000000 [ 32.046011] Dumping ftrace buffer: [ 32.049536] (ftrace buffer empty) [ 32.053222] Kernel Offset: disabled [ 32.056836] Rebooting in 86400 seconds..