[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 14.721667] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.689771] random: sshd: uninitialized urandom read (32 bytes read) [ 20.261249] random: sshd: uninitialized urandom read (32 bytes read) [ 21.161341] random: sshd: uninitialized urandom read (32 bytes read) [ 102.029107] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.0.59' (ECDSA) to the list of known hosts. [ 107.387016] random: sshd: uninitialized urandom read (32 bytes read) RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported RTNETLINK answers: Operation not supported [ 107.468665] IPVS: Creating netns size=2536 id=1 Error: argument "bridge0" is wrong: Device does not exist Error: argument "bridge0" is wrong: Device does not exist Error: argument "bond0" is wrong: Device does not exist Error: argument "bond0" is wrong: Device does not exist [ 107.545449] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bridge: link is not ready [ 107.556384] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bridge: link is not ready Error: argument "team0" is wrong: Device does not exist Error: argument "team0" is wrong: Device does not exist [ 107.595994] IPv6: ADDRCONF(NETDEV_UP): veth0_to_bond: link is not ready [ 107.606901] IPv6: ADDRCONF(NETDEV_UP): veth1_to_bond: link is not ready [ 107.645990] IPv6: ADDRCONF(NETDEV_UP): veth0_to_team: link is not ready [ 107.657392] IPv6: ADDRCONF(NETDEV_UP): veth1_to_team: link is not ready [ 107.668782] IPv6: ADDRCONF(NETDEV_CHANGE): veth0_to_bridge: link becomes ready RTNETLINK answers: Operation not supported [ 107.689257] IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "bridge0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" Cannot find device "vcan0" RTNETLINK answers: Operation not supported Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gre0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "gretap0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6_vti0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6tnl0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gre0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "ip6gretap0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "erspan0" Cannot find device "bond0" Cannot find device "bond0" Cannot find device "bond0" Cannot find device "bond0" Cannot find device "team0" Cannot find device "team0" Cannot find device "team0" Cannot find device "team0" [ 108.123642] IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready [ 108.146322] IPv6: ADDRCONF(NETDEV_UP): veth1: link is not ready [ 108.152442] IPv6: ADDRCONF(NETDEV_CHANGE): veth1: link becomes ready [ 108.159497] IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready executing program executing program executing program executing program executing program [ 108.516027] syz-executor028 (4221) used greatest stack depth: 23448 bytes left executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 111.093193] random: crng init done executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program INIT: Id "6" respawning too fast: disabled for 5 minutes INIT: Id "5" respawning too fast: disabled for 5 minutes INIT: Id "2" respawning too fast: disabled for 5 minutes INIT: Id "3" respawning too fast: disabled for 5 minutes INIT: Id "4" respawning too fast: disabled for 5 minutes INIT: Id "1" respawning too fast: disabled for 5 minutes executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 117.258001] syz-executor028 (4865) used greatest stack depth: 23096 bytes left [ 117.307906] ------------[ cut here ]------------ [ 117.312692] kernel BUG at fs/ext4/inode.c:2630! [ 117.317332] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 117.322668] Dumping ftrace buffer: [ 117.326177] (ftrace buffer empty) [ 117.329860] Modules linked in: [ 117.333146] CPU: 1 PID: 4869 Comm: syz-executor028 Not tainted 4.9.100-ge14d1a3 #31 [ 117.340907] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 117.350231] task: ffff8801cd5d3000 task.stack: ffff8801cdf68000 [ 117.356258] RIP: 0010:[] [] mpage_prepare_extent_to_map+0x7f8/0xa40 [ 117.365972] RSP: 0018:ffff8801cdf6f3c0 EFLAGS: 00010293 [ 117.371392] RAX: ffff8801cd5d3000 RBX: ffffea0007199400 RCX: 0000000000000000 [ 117.378636] RDX: 0000000000000000 RSI: ffffffff8173cde8 RDI: ffffea0007199408 [ 117.385877] RBP: ffff8801cdf6f588 R08: ffff8801cd5d3938 R09: 0000000000000001 [ 117.393121] R10: 0000000000000000 R11: 1ffff10039aba722 R12: 0000000000000009 [ 117.400377] R13: 0000000000000000 R14: ffff8801cdf6f6f0 R15: dffffc0000000000 [ 117.407621] FS: 0000000000000000(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000 [ 117.415817] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 117.421668] CR2: 00007fbe3c1d2e78 CR3: 000000000461e000 CR4: 00000000001606f0 [ 117.428910] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 117.436153] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 117.443408] Stack: [ 117.445534] 1ffff10039bede88 ffff8801cdf6f6f8 ffff8801cdf6f460 ffff8801cdf6f700 [ 117.453525] 00000000cd5d38c0 ffff8801b67d2448 000000010000000c 7fffffffffffffff [ 117.461512] ffff8801cdf6f4a0 ffff8801cdf6f708 ffffea0007199410 ffffed0039bededf [ 117.469495] Call Trace: [ 117.472058] [] ? ext4_journalled_zero_new_buffers+0x3a0/0x3a0 [ 117.479565] [] ? __lock_is_held+0xa2/0xf0 [ 117.485345] [] ? __lock_is_held+0xa2/0xf0 [ 117.491120] [] ext4_writepages+0xdb9/0x2e50 [ 117.497061] [] ? do_writepages+0xef/0x1d0 [ 117.502830] [] ? __unwind_start+0x14d/0x3c0 [ 117.508789] [] ? unwind_next_frame+0x86/0xe0 [ 117.514820] [] ? ext4_mark_inode_dirty+0xb40/0xb40 [ 117.521371] [] ? __unwind_start+0x14d/0x3c0 [ 117.527324] [] ? depot_save_stack+0x132/0x460 [ 117.533440] [] ? ext4_mark_inode_dirty+0xb40/0xb40 [ 117.539991] [] do_writepages+0xef/0x1d0 [ 117.545586] [] ? page_writeback_cpu_online+0x20/0x20 [ 117.552310] [] ? exit_fs+0xe9/0x120 [ 117.557559] [] ? do_exit+0x9bb/0x27c0 [ 117.562979] [] ? do_group_exit+0x111/0x340 [ 117.568836] [] ? get_signal+0x4cf/0x1450 [ 117.574866] [] ? do_signal+0x87/0x19f0 [ 117.580376] [] ? exit_to_usermode_loop+0xe1/0x120 [ 117.586838] [] ? do_syscall_64+0x364/0x490 [ 117.592695] [] ? entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 117.599766] [] __filemap_fdatawrite_range+0x1b3/0x250 [ 117.606578] [] ? replace_page_cache_page+0x620/0x620 [ 117.613302] [] ? ext4_check_all_de+0xf0/0xf0 [ 117.619329] [] filemap_flush+0x23/0x30 [ 117.624837] [] ext4_alloc_da_blocks+0xd9/0x330 [ 117.631042] [] ext4_release_file+0x1ff/0x2e0 [ 117.637073] [] __fput+0x263/0x700 [ 117.642146] [] ____fput+0x15/0x20 [ 117.647233] [] task_work_run+0x10c/0x180 [ 117.653342] [] do_exit+0x9e1/0x27c0 [ 117.658594] [] ? debug_check_no_locks_freed+0x210/0x210 [ 117.665580] [] ? release_task.part.19+0x1210/0x1210 [ 117.672216] [] ? generic_file_read_iter+0x487/0x1a90 [ 117.678938] [] ? recalc_sigpending+0x72/0x90 [ 117.684969] [] do_group_exit+0x111/0x340 [ 117.690650] [] get_signal+0x4cf/0x1450 [ 117.696158] [] do_signal+0x87/0x19f0 [ 117.701496] [] ? __fsnotify_update_child_dentry_flags.part.1+0x300/0x300 [ 117.709959] [] ? selinux_file_permission+0x82/0x470 [ 117.716597] [] ? setup_sigcontext+0x7d0/0x7d0 [ 117.722714] [] ? do_futex+0x1770/0x1770 [ 117.728312] [] ? SyS_pread64+0xe8/0x170 [ 117.733909] [] ? exit_to_usermode_loop+0xac/0x120 [ 117.740384] [] exit_to_usermode_loop+0xe1/0x120 [ 117.746672] [] do_syscall_64+0x364/0x490 [ 117.752374] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 117.759267] Code: ff 48 8b 75 d0 65 48 33 34 25 28 00 00 00 0f 85 50 02 00 00 48 81 c4 a0 01 00 00 5b 41 5c 41 5d 41 5e 41 5f 5d c3 e8 18 fc c1 ff <0f> 0b e8 11 fc c1 ff 8b 95 18 ff ff ff 85 d2 75 7a e8 02 fc c1 [ 117.786029] RIP [] mpage_prepare_extent_to_map+0x7f8/0xa40 [ 117.793395] RSP [ 117.797197] ---[ end trace fe66a6160956dc6d ]--- [ 117.801930] Kernel panic - not syncing: Fatal exception [ 117.807650] Dumping ftrace buffer: [ 117.811163] (ftrace buffer empty) [ 117.814846] Kernel Offset: disabled [ 117.818444] Rebooting in 86400 seconds..