Starting mcstransd: [ 8.932186] random: sshd: uninitialized urandom read (32 bytes read) [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 31.551520] random: sshd: uninitialized urandom read (32 bytes read) [ 31.964142] random: sshd: uninitialized urandom read (32 bytes read) [ 32.119530] random: crng init done Warning: Permanently added '10.128.0.99' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 38.973985] ------------[ cut here ]------------ [ 38.978751] kernel BUG at fs/ext4/fsync.c:103! [ 38.983312] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 38.988672] Modules linked in: [ 38.991974] CPU: 1 PID: 2080 Comm: syz-executor138 Not tainted 4.9.148+ #1 [ 38.998957] task: ffff8801cf2b2f80 task.stack: ffff8801cef58000 [ 39.004989] RIP: 0010:[] [] ext4_sync_file+0x7f8/0x10a0 [ 39.013675] RSP: 0018:ffff8801db707af0 EFLAGS: 00010206 [ 39.019099] RAX: ffff8801cf2b2f80 RBX: ffff8801ca73ca80 RCX: dffffc0000000000 [ 39.026344] RDX: 0000000000000100 RSI: ffffffff816b8b98 RDI: ffff8801cf2b3fb8 [ 39.033593] RBP: ffff8801db707b38 R08: 0000000000000000 R09: ffff8801cf2b3878 [ 39.040839] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801cf1f5800 [ 39.048086] R13: ffff8801ca73caa8 R14: ffff8801d5cdd500 R15: 0000000000000000 [ 39.055343] FS: 0000000001b63880(0000) GS:ffff8801db700000(0000) knlGS:0000000000000000 [ 39.055348] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 39.055352] CR2: 0000000021000000 CR3: 00000001cf358000 CR4: 00000000001606b0 [ 39.055360] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 39.055364] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 39.055365] Stack: [ 39.055381] ffff8801ca73cb58 000000000000ffff 0000000000000000 ffff880100000001 [ 39.055399] ffffffff816b83a0 ffff8801cf1f5800 0000000000000001 0000000000000000 [ 39.055407] 000000000000ffff ffff8801db707b88 ffffffff815b37f1 e9e627954b055420 [ 39.055409] Call Trace: [ 39.055421] [ 39.055422] [] ? ext4_llseek+0x8e0/0x8e0 [ 39.055431] [] vfs_fsync_range+0x111/0x260 [ 39.055438] [] dio_complete+0x376/0x6e0 [ 39.055446] [] ? trace_hardirqs_on_caller+0x260/0x5a0 [ 39.055453] [] ? ext4_update_bh_state+0xf0/0xf0 [ 39.055460] [] dio_bio_end_aio+0x124/0x390 [ 39.055466] [] ? dio_complete+0x6e0/0x6e0 [ 39.055475] [] bio_endio+0x1ad/0x200 [ 39.055482] [] blk_update_request+0x24e/0x9d0 [ 39.055491] [] scsi_end_request+0x9c/0x5c0 [ 39.055499] [] scsi_io_completion+0x275/0x17e0 [ 39.055507] [] ? scsi_unblock_requests+0x50/0x50 [ 39.055514] [] ? check_preemption_disabled+0x3c/0x200 [ 39.055521] [] ? scsi_handle_queue_ramp_up+0x32a/0x430 [ 39.055529] [] ? sd_completed_bytes+0x3f0/0x3f0 [ 39.055536] [] scsi_finish_command+0x3ad/0x520 [ 39.055543] [] scsi_softirq_done+0x259/0x370 [ 39.055550] [] ? trace_hardirqs_on_caller+0x260/0x5a0 [ 39.055557] [] blk_done_softirq+0x27e/0x3e0 [ 39.055564] [] ? trigger_softirq+0x210/0x210 [ 39.055572] [] __do_softirq+0x22d/0x964 [ 39.055580] [] ? check_preemption_disabled+0x3c/0x200 [ 39.055587] [] irq_exit+0x119/0x160 [ 39.055594] [] do_IRQ+0x111/0x1d0 [ 39.055601] [] common_interrupt+0x9d/0x9d [ 39.055609] [ 39.055610] [] ? lock_acquire+0x176/0x3d0 [ 39.055616] [] ? ext4_map_blocks+0x77a/0x1710 [ 39.055622] [] down_write+0x41/0xa0 [ 39.055628] [] ? ext4_map_blocks+0x77a/0x1710 [ 39.055634] [] ext4_map_blocks+0x77a/0x1710 [ 39.055642] [] ? mpage_process_page_bufs+0x4a0/0x4a0 [ 39.055666] [] ? ext4_issue_zeroout+0x150/0x150 [ 39.055673] [] ? check_preemption_disabled+0x3c/0x200 [ 39.055694] [] ext4_writepages+0x155e/0x2d20 [ 39.055700] [] ? do_writepages+0xfc/0x1e0 [ 39.055707] [] ? ext4_mark_inode_dirty+0xb30/0xb30 [ 39.055713] [] ? __lock_acquire+0x5e5/0x4350 [ 39.055719] [] ? trace_hardirqs_on+0x10/0x10 [ 39.055725] [] ? trace_hardirqs_on+0x10/0x10 [ 39.055732] [] ? ext4_mark_inode_dirty+0xb30/0xb30 [ 39.055737] [] do_writepages+0xfc/0x1e0 [ 39.055743] [] ? page_writeback_cpu_online+0x20/0x20 [ 39.055749] [] ? dput.part.0+0x3e6/0x7c0 [ 39.055756] [] ? check_preemption_disabled+0x3c/0x200 [ 39.055762] [] ? dput.part.0+0x145/0x7c0 [ 39.055769] [] __filemap_fdatawrite_range+0x1ad/0x260 [ 39.055790] [] ? replace_page_cache_page+0x600/0x600 [ 39.055797] [] ? check_preemption_disabled+0x3c/0x200 [ 39.055819] [] ? check_preemption_disabled+0x3c/0x200 [ 39.055826] [] ? ext4_check_all_de+0xf0/0xf0 [ 39.055832] [] filemap_flush+0x24/0x30 [ 39.055839] [] ext4_alloc_da_blocks+0xd6/0x340 [ 39.055846] [] ext4_release_file+0x1ff/0x2e0 [ 39.055853] [] __fput+0x274/0x720 [ 39.055859] [] ____fput+0x16/0x20 [ 39.055866] [] task_work_run+0x108/0x180 [ 39.055875] [] exit_to_usermode_loop+0x13b/0x160 [ 39.055881] [] do_syscall_64+0x3f7/0x570 [ 39.055888] [] entry_SYSCALL_64_after_swapgs+0x5d/0xdb [ 39.055998] Code: 00 0f 85 03 08 00 00 49 8b bd 28 01 00 00 31 d2 be c0 00 40 02 e8 89 d5 42 00 45 85 e4 44 0f 44 e0 e9 ef fa ff ff e8 98 27 c6 ff <0f> 0b e8 91 27 c6 ff 65 8b 15 8a d5 95 7e 89 d2 48 0f a3 15 c8 [ 39.056006] RIP [] ext4_sync_file+0x7f8/0x10a0 [ 39.056008] RSP [ 39.056076] ---[ end trace 6b6bb05cdaf8665d ]--- [ 39.056081] Kernel panic - not syncing: Fatal exception in interrupt [ 39.063910] Kernel Offset: disabled [ 39.526022] Rebooting in 86400 seconds..