[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[   18.338392] random: sshd: uninitialized urandom read (32 bytes read)
[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

syzkaller login: [   20.249529] random: sshd: uninitialized urandom read (32 bytes read)
[   20.547832] random: sshd: uninitialized urandom read (32 bytes read)
[   21.268275] random: sshd: uninitialized urandom read (32 bytes read)
[   21.422934] random: sshd: uninitialized urandom read (32 bytes read)
Warning: Permanently added '10.128.10.53' (ECDSA) to the list of known hosts.
[   26.800725] random: sshd: uninitialized urandom read (32 bytes read)
2018/04/27 12:10:39 parsed 1 programs
2018/04/27 12:10:39 executed programs: 0
[   27.276178] IPVS: ftp: loaded support on port[0] = 21
[   27.286379] IPVS: ftp: loaded support on port[0] = 21
[   27.311474] IPVS: ftp: loaded support on port[0] = 21
[   27.327684] IPVS: ftp: loaded support on port[0] = 21
[   27.333705] IPVS: ftp: loaded support on port[0] = 21
[   27.346247] IPVS: ftp: loaded support on port[0] = 21
[   27.361121] IPVS: ftp: loaded support on port[0] = 21
[   27.372713] IPVS: ftp: loaded support on port[0] = 21
[   27.462238] loop: Write error at byte offset 0, length 4096.
[   27.468322] print_req_error: I/O error, dev loop0, sector 0
[   27.474550] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   27.484657] loop: Write error at byte offset 0, length 4096.
[   27.490567] print_req_error: I/O error, dev loop0, sector 0
[   27.496343] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   27.510100] loop: Write error at byte offset 0, length 4096.
[   27.516083] print_req_error: I/O error, dev loop0, sector 0
[   27.521876] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   27.583492] loop: Write error at byte offset 0, length 4096.
[   27.589436] print_req_error: I/O error, dev loop0, sector 0
[   27.595213] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   27.604333] loop: Write error at byte offset 0, length 4096.
[   27.610238] print_req_error: I/O error, dev loop0, sector 0
[   27.616095] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   27.627192] loop: Write error at byte offset 0, length 4096.
[   27.633097] print_req_error: I/O error, dev loop0, sector 0
[   27.638890] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   27.647067] loop: Write error at byte offset 0, length 4096.
[   27.653009] print_req_error: I/O error, dev loop0, sector 0
[   27.658839] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   27.667163] loop: Write error at byte offset 0, length 4096.
[   27.673078] print_req_error: I/O error, dev loop0, sector 0
[   27.678866] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   27.740960] loop: Write error at byte offset 0, length 4096.
[   27.746987] print_req_error: I/O error, dev loop0, sector 0
[   27.752778] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   27.760794] loop: Write error at byte offset 0, length 4096.
[   27.766715] print_req_error: I/O error, dev loop0, sector 0
[   27.772478] Buffer I/O error on dev loop0, logical block 0, lost async page write
2018/04/27 12:10:44 executed programs: 301
[   32.463270] lo_write_bvec: 904 callbacks suppressed
[   32.463277] loop: Write error at byte offset 0, length 4096.
[   32.475767] print_req_error: 904 callbacks suppressed
[   32.475776] print_req_error: I/O error, dev loop0, sector 0
[   32.486811] buffer_io_error: 904 callbacks suppressed
[   32.486821] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   32.500098] loop: Write error at byte offset 0, length 4096.
[   32.505971] print_req_error: I/O error, dev loop0, sector 0
[   32.511755] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   32.525197] loop: Write error at byte offset 0, length 4096.
[   32.531126] print_req_error: I/O error, dev loop0, sector 0
[   32.536917] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   32.547423] loop: Write error at byte offset 0, length 4096.
[   32.553371] print_req_error: I/O error, dev loop0, sector 0
[   32.559139] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   32.568130] loop: Write error at byte offset 0, length 4096.
[   32.574085] print_req_error: I/O error, dev loop0, sector 0
[   32.579869] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   32.587984] loop: Write error at byte offset 0, length 4096.
[   32.593912] print_req_error: I/O error, dev loop0, sector 0
[   32.599689] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   32.611220] loop: Write error at byte offset 0, length 4096.
[   32.617094] print_req_error: I/O error, dev loop0, sector 0
[   32.622859] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   32.631284] loop: Write error at byte offset 0, length 4096.
[   32.637192] print_req_error: I/O error, dev loop0, sector 0
[   32.643036] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   32.652598] loop: Write error at byte offset 0, length 4096.
[   32.658588] print_req_error: I/O error, dev loop0, sector 0
[   32.664347] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   32.672337] loop: Write error at byte offset 0, length 4096.
[   32.678222] print_req_error: I/O error, dev loop0, sector 0
[   32.684006] Buffer I/O error on dev loop0, logical block 0, lost async page write
2018/04/27 12:10:49 executed programs: 616
[   37.466987] lo_write_bvec: 920 callbacks suppressed
[   37.466994] loop: Write error at byte offset 0, length 4096.
[   37.478056] print_req_error: 920 callbacks suppressed
[   37.478069] print_req_error: I/O error, dev loop0, sector 0
[   37.489189] buffer_io_error: 920 callbacks suppressed
[   37.489198] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   37.504218] loop: Write error at byte offset 0, length 4096.
[   37.510095] print_req_error: I/O error, dev loop0, sector 0
[   37.515890] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   37.525127] loop: Write error at byte offset 0, length 4096.
[   37.531065] print_req_error: I/O error, dev loop0, sector 0
[   37.536888] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   37.547646] loop: Write error at byte offset 0, length 4096.
[   37.553541] print_req_error: I/O error, dev loop0, sector 0
[   37.559313] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   37.568262] loop: Write error at byte offset 0, length 4096.
[   37.574134] print_req_error: I/O error, dev loop0, sector 0
[   37.579985] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   37.588198] loop: Write error at byte offset 0, length 4096.
[   37.594066] print_req_error: I/O error, dev loop0, sector 0
[   37.599855] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   37.610531] loop: Write error at byte offset 0, length 4096.
[   37.616400] print_req_error: I/O error, dev loop0, sector 0
[   37.622184] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   37.630772] loop: Write error at byte offset 0, length 4096.
[   37.636701] print_req_error: I/O error, dev loop0, sector 0
[   37.642473] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   37.650656] loop: Write error at byte offset 0, length 4096.
[   37.656573] print_req_error: I/O error, dev loop0, sector 0
[   37.662341] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   37.670425] loop: Write error at byte offset 0, length 4096.
[   37.676293] print_req_error: I/O error, dev loop0, sector 0
[   37.682193] Buffer I/O error on dev loop0, logical block 0, lost async page write
2018/04/27 12:10:54 executed programs: 930
[   42.474486] lo_write_bvec: 930 callbacks suppressed
[   42.474493] loop: Write error at byte offset 0, length 4096.
[   42.485424] print_req_error: 930 callbacks suppressed
[   42.485433] print_req_error: I/O error, dev loop0, sector 0
[   42.496420] buffer_io_error: 930 callbacks suppressed
[   42.496429] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   42.510103] loop: Write error at byte offset 0, length 4096.
[   42.515969] print_req_error: I/O error, dev loop0, sector 0
[   42.521738] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   42.542064] loop: Write error at byte offset 0, length 4096.
[   42.547970] print_req_error: I/O error, dev loop0, sector 0
[   42.553804] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   42.561748] loop: Write error at byte offset 0, length 4096.
[   42.567636] print_req_error: I/O error, dev loop0, sector 0
[   42.573418] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   42.581428] loop: Write error at byte offset 0, length 4096.
[   42.587307] print_req_error: I/O error, dev loop0, sector 0
[   42.593058] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   42.604563] loop: Write error at byte offset 0, length 4096.
[   42.610431] print_req_error: I/O error, dev loop0, sector 0
[   42.616189] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   42.624341] loop: Write error at byte offset 0, length 4096.
[   42.630272] print_req_error: I/O error, dev loop0, sector 0
[   42.636046] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   42.644142] loop: Write error at byte offset 0, length 4096.
[   42.649998] print_req_error: I/O error, dev loop0, sector 0
[   42.655768] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   42.663862] loop: Write error at byte offset 0, length 4096.
[   42.669775] print_req_error: I/O error, dev loop0, sector 0
[   42.675541] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   42.685160] loop: Write error at byte offset 0, length 4096.
[   42.691048] print_req_error: I/O error, dev loop0, sector 0
[   42.696829] Buffer I/O error on dev loop0, logical block 0, lost async page write
2018/04/27 12:10:59 executed programs: 1245
[   47.479226] lo_write_bvec: 911 callbacks suppressed
[   47.479234] loop: Write error at byte offset 0, length 4096.
[   47.490364] print_req_error: 911 callbacks suppressed
[   47.490372] print_req_error: I/O error, dev loop0, sector 0
[   47.501360] buffer_io_error: 911 callbacks suppressed
[   47.501370] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   47.515342] loop: Write error at byte offset 0, length 4096.
[   47.521226] print_req_error: I/O error, dev loop0, sector 0
[   47.527009] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   47.534979] loop: Write error at byte offset 0, length 4096.
[   47.540921] print_req_error: I/O error, dev loop0, sector 0
[   47.546801] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   47.558338] loop: Write error at byte offset 0, length 4096.
[   47.564300] print_req_error: I/O error, dev loop0, sector 0
[   47.570088] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   47.578147] loop: Write error at byte offset 0, length 4096.
[   47.584010] print_req_error: I/O error, dev loop0, sector 0
[   47.589888] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   47.597829] loop: Write error at byte offset 0, length 4096.
[   47.603716] print_req_error: I/O error, dev loop0, sector 0
[   47.609499] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   47.617490] loop: Write error at byte offset 0, length 4096.
[   47.623977] print_req_error: I/O error, dev loop0, sector 0
[   47.629738] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   47.637706] loop: Write error at byte offset 0, length 4096.
[   47.643593] print_req_error: I/O error, dev loop0, sector 0
[   47.649332] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   47.657377] loop: Write error at byte offset 0, length 4096.
[   47.663256] print_req_error: I/O error, dev loop0, sector 0
[   47.669085] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   47.677249] loop: Write error at byte offset 0, length 4096.
[   47.683167] print_req_error: I/O error, dev loop0, sector 0
[   47.688949] Buffer I/O error on dev loop0, logical block 0, lost async page write
[   49.097764] WARNING: CPU: 0 PID: 9917 at fs/buffer.c:1079 mark_buffer_dirty+0x555/0x6b0
[   49.105962] Kernel panic - not syncing: panic_on_warn set ...
[   49.105962] 
[   49.113335] CPU: 0 PID: 9917 Comm: syz-executor2 Not tainted 4.17.0-rc2+ #44
[   49.120526] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   49.129879] Call Trace:
[   49.132476]  dump_stack+0x1b9/0x294
[   49.136115]  ? dump_stack_print_info.cold.2+0x52/0x52
[   49.141321]  ? mark_buffer_dirty+0x4f0/0x6b0
[   49.145736]  panic+0x22f/0x4de
[   49.148935]  ? add_taint.cold.5+0x16/0x16
[   49.153102]  ? __warn.cold.8+0x148/0x1b3
[   49.157173]  ? __warn.cold.8+0x117/0x1b3
[   49.161230]  ? mark_buffer_dirty+0x555/0x6b0
[   49.165627]  __warn.cold.8+0x163/0x1b3
[   49.169515]  ? mark_buffer_dirty+0x555/0x6b0
[   49.173930]  report_bug+0x252/0x2d0
[   49.177566]  do_error_trap+0x1de/0x490
[   49.181463]  ? math_error+0x420/0x420
[   49.185283]  ? check_same_owner+0x320/0x320
[   49.189614]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   49.194452]  do_invalid_op+0x1b/0x20
[   49.198170]  invalid_op+0x14/0x20
[   49.201624] RIP: 0010:mark_buffer_dirty+0x555/0x6b0
[   49.206635] RSP: 0018:ffff8801b76cf028 EFLAGS: 00010293
[   49.212008] RAX: ffff8801b0464740 RBX: ffff8801b8b43e70 RCX: ffffffff81cf57bf
[   49.219281] RDX: 0000000000000000 RSI: ffffffff81cf5c65 RDI: 0000000000000007
[   49.226541] RBP: ffff8801b76cf138 R08: ffff8801b0464740 R09: ffffea0006bd8c00
[   49.233799] R10: ffffed0035ec6000 R11: ffff8801af630006 R12: 1ffff10036ed9e06
[   49.241061] R13: 0000000000000000 R14: ffff8801b76cf110 R15: dffffc0000000000
[   49.248341]  ? mark_buffer_dirty+0xaf/0x6b0
[   49.252653]  ? mark_buffer_dirty+0x555/0x6b0
[   49.257079]  ? mark_buffer_dirty+0x555/0x6b0
[   49.261488]  ? __set_page_dirty_buffers+0x410/0x410
[   49.266500]  ? check_disk_change+0x140/0x140
[   49.270900]  ? __breadahead+0x150/0x150
[   49.274864]  __block_commit_write.isra.35+0x19a/0x390
[   49.280055]  ? mark_buffer_dirty_inode+0x5a0/0x5a0
[   49.284983]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   49.293650]  ? wait_for_stable_page+0x186/0x350
[   49.298407]  block_write_end+0xa5/0x260
[   49.302382]  ? page_zero_new_buffers+0x660/0x660
[   49.307134]  ? memcpy_from_page+0x8e/0xf0
[   49.311367]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   49.316913]  blkdev_write_end+0xc5/0x2d0
[   49.320984]  ? blkdev_bio_end_io+0x800/0x800
[   49.325394]  ? csum_and_copy_from_iter_full+0x1090/0x1090
[   49.330928]  ? current_kernel_time64+0x242/0x2f0
[   49.335684]  ? blkdev_write_begin+0x3c/0x50
[   49.340007]  ? blkdev_bio_end_io+0x800/0x800
[   49.344448]  generic_perform_write+0x4c9/0x6a0
[   49.349026]  ? generic_update_time+0x255/0x420
[   49.353621]  ? add_page_wait_queue+0x2a0/0x2a0
[   49.358200]  ? current_time+0xc0/0xc0
[   49.361987]  ? blk_lld_busy+0x70/0x70
[   49.365799]  __generic_file_write_iter+0x26e/0x630
[   49.371853]  ? kasan_kmalloc+0xc4/0xe0
[   49.375737]  ? __kmalloc+0x14e/0x760
[   49.379449]  blkdev_write_iter+0x233/0x420
[   49.383681]  ? blkdev_close+0xb0/0xb0
[   49.387473]  do_iter_readv_writev+0x859/0xa50
[   49.391956]  ? vfs_dedupe_file_range+0xa00/0xa00
[   49.396706]  ? rw_verify_area+0x118/0x360
[   49.401295]  do_iter_write+0x185/0x5f0
[   49.405170]  ? rcu_read_lock_sched_held+0x108/0x120
[   49.410169]  ? __kmalloc+0x5f9/0x760
[   49.413866]  ? __mutex_init+0x1ef/0x280
[   49.417835]  vfs_iter_write+0x77/0xb0
[   49.421641]  iter_file_splice_write+0x8cb/0xff0
[   49.426316]  ? do_vmsplice+0x1b0/0x1b0
[   49.430219]  ? rw_verify_area+0x118/0x360
[   49.434351]  ? do_vmsplice+0x1b0/0x1b0
[   49.438240]  direct_splice_actor+0x128/0x190
[   49.442636]  splice_direct_to_actor+0x310/0x8d0
[   49.447297]  ? pipe_to_sendpage+0x3f0/0x3f0
[   49.451627]  ? do_splice_to+0x190/0x190
[   49.455596]  ? rw_verify_area+0x118/0x360
[   49.459730]  do_splice_direct+0x2cc/0x400
[   49.463880]  ? splice_direct_to_actor+0x8d0/0x8d0
[   49.468731]  ? rw_verify_area+0x118/0x360
[   49.472882]  do_sendfile+0x60f/0xe00
[   49.476598]  ? do_compat_pwritev64+0x1b0/0x1b0
[   49.481171]  ? __might_sleep+0x95/0x190
[   49.485145]  __ia32_compat_sys_sendfile+0x187/0x290
[   49.490148]  ? __ia32_sys_sendfile64+0x240/0x240
[   49.494912]  ? do_fast_syscall_32+0x148/0xf9b
[   49.500882]  do_fast_syscall_32+0x345/0xf9b
[   49.505192]  ? do_int80_syscall_32+0x880/0x880
[   49.509762]  ? _raw_spin_unlock_irq+0x27/0x70
[   49.514243]  ? finish_task_switch+0x1ca/0x810
[   49.518742]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   49.524279]  ? syscall_return_slowpath+0x30f/0x5c0
[   49.529227]  ? sysret32_from_system_call+0x5/0x46
[   49.534078]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   49.538925]  entry_SYSENTER_compat+0x70/0x7f
[   49.543325] RIP: 0023:0xf7f5bcb9
[   49.546677] RSP: 002b:00000000f7f570ac EFLAGS: 00000282 ORIG_RAX: 00000000000000bb
[   49.554377] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000004
[   49.561638] RDX: 0000000020000000 RSI: 0000000000000007 RDI: 0000000000000000
[   49.568905] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[   49.576175] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[   49.583439] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[   49.591365] Dumping ftrace buffer:
[   49.594946]    (ftrace buffer empty)
[   49.598636] Kernel Offset: disabled
[   49.602245] Rebooting in 86400 seconds..