[ 16.334551] random: sshd: uninitialized urandom read (32 bytes read, 32 bits of entropy available) [....] 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: [ 21.082464] random: sshd: uninitialized urandom read (32 bytes read, 36 bits of entropy available) [ 21.397035] random: sshd: uninitialized urandom read (32 bytes read, 37 bits of entropy available) [ 22.114157] random: sshd: uninitialized urandom read (32 bytes read, 74 bits of entropy available) [ 22.284724] random: sshd: uninitialized urandom read (32 bytes read, 79 bits of entropy available) Warning: Permanently added '10.128.0.11' (ECDSA) to the list of known hosts. [ 27.657835] random: sshd: uninitialized urandom read (32 bytes read, 87 bits of entropy available) executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 27.761701] kasan: CONFIG_KASAN_INLINE enabled[ 27.761898] BUG: spinlock bad magic on CPU#0, syzkaller057331/3326 [ 27.761907] lock: 0xffff8800b408a118, .magic: dead4eac, .owner: /-1, .owner_cpu: -1 [ 27.761914] CPU: 0 PID: 3326 Comm: syzkaller057331 Not tainted 4.4.111-g7902639 #18 [ 27.761917] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.761920] 0000000000000000 3f6bff638adf114d ffff8801db2078d8 ffffffff81d0509d [ 27.761928] ffff8800b408a118 ffff8801d11adf00 0000000000000001 0000000000000001 [ 27.761935] 0000000000000000 ffff8801db207918 ffffffff81245acd 0000000000000000 [ 27.761942] Call Trace: [ 27.761944] [] dump_stack+0xc1/0x124 [ 27.761965] [] spin_dump+0x14d/0x280 [ 27.761971] [] do_raw_spin_lock+0x228/0x2c0 [ 27.761979] [] _raw_spin_lock_irqsave+0x56/0x70 [ 27.761987] [] ? __wake_up+0x1e/0x50 [ 27.761992] [] __wake_up+0x1e/0x50 [ 27.762000] [] sg_rq_end_io+0x5dc/0xbc0 [ 27.762006] [] ? sg_release+0x1f0/0x1f0 [ 27.762015] [] ? blk_account_io_done+0xb1/0x860 [ 27.762021] [] ? blk_update_request+0x64e/0xce0 [ 27.762027] [] ? sg_release+0x1f0/0x1f0 [ 27.762035] [] __blk_mq_end_request+0x54/0xc0 [ 27.762043] [] scsi_end_request+0x135/0x5b0 [ 27.762049] [] scsi_io_completion+0x15c3/0x1710 [ 27.762056] [] ? scsi_unblock_requests+0x50/0x50 [ 27.762062] [] ? debug_check_no_locks_freed+0x2c0/0x2c0 [ 27.762067] [] scsi_finish_command+0x3af/0x520 [ 27.762074] [] scsi_softirq_done+0x250/0x350 [ 27.762080] [] __blk_mq_complete_request+0x205/0x500 [ 27.762087] [] blk_mq_complete_request+0x5b/0x70 [ 27.762092] [] scsi_mq_done+0xfb/0x3c0 [ 27.762099] [] virtscsi_complete_cmd+0x5cf/0x7f0 [ 27.762106] [] ? virtscsi_remove+0x140/0x140 [ 27.762112] [] virtscsi_vq_done+0xc9/0x170 [ 27.762118] [] ? virtscsi_target_destroy+0x50/0x50 [ 27.762125] [] virtscsi_req_done+0xa7/0xd0 [ 27.762131] [] ? virtscsi_vq_done+0x170/0x170 [ 27.762138] [] vring_interrupt+0x109/0x150 [ 27.762143] [] ? vring_new_virtqueue+0x7c0/0x7c0 [ 27.762151] [] handle_irq_event_percpu+0xf1/0x960 [ 27.762157] [] handle_irq_event+0xa7/0x140 [ 27.762163] [] handle_edge_irq+0x1fa/0x8e0 [ 27.762170] [] ? __local_bh_enable+0x32/0x60 [ 27.762177] [] handle_irq+0x250/0x3a0 [ 27.762183] [] ? check_preemption_disabled+0x3b/0x200 [ 27.762190] [] do_IRQ+0x89/0x1b0 [ 27.762196] [] common_interrupt+0xa0/0xa0 [ 27.762197] [] ? clear_page_c_e+0x7/0x10 [ 27.762215] [] ? clear_huge_page+0xf3/0x4b0 [ 27.762221] [] ? __raw_spin_lock_init+0x2d/0x100 [ 27.762229] [] do_huge_pmd_anonymous_page+0x270/0xa10 [ 27.762235] [] handle_mm_fault+0x271a/0x3190 [ 27.762243] [] ? rw_verify_area+0x100/0x2f0 [ 27.762250] [] ? copy_page_range+0x14a0/0x14a0 [ 27.762256] [] ? vmacache_find+0x59/0x290 [ 27.762265] [] __do_page_fault+0x35b/0xa00 [ 27.762272] [] do_page_fault+0x27/0x30 [ 27.762278] [] page_fault+0x28/0x30 [ 27.774141] kasan: CONFIG_KASAN_INLINE enabledkasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN [ 27.774160] Dumping ftrace buffer: [ 27.774164] (ftrace buffer empty) [ 27.774166] Modules linked in: [ 27.774175] CPU: 0 PID: 3330 Comm: syzkaller057331 Not tainted 4.4.111-g7902639 #18 [ 27.774178] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 27.774182] task: ffff8801d18e17c0 task.stack: ffff8800b40c0000 [ 27.774185] RIP: 0010:[] [] __free_pages+0x21/0x90 [ 27.774200] RSP: 0018:ffff8800b40c7970 EFLAGS: 00010a07 [ 27.774204] RAX: dffffc0000000000 RBX: dead4ead00000000 RCX: ffffffff825b9ebb [ 27.774207] RDX: 1bd5a9d5a0000003 RSI: 0000000000000001 RDI: dead4ead0000001c [ 27.774210] RBP: ffff8800b40c7980 R08: 0000000000000000 R09: 0000000000000000 [ 27.774214] R10: 0000000000000000 R11: 1ffff10016818f0e R12: 0000000000000004 [ 27.774217] R13: 0000000000000020 R14: ffff8801d1374200 R15: dffffc0000000000 [ 27.774222] FS: 0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:0000000009e4a840 [ 27.774226] CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 [ 27.774229] CR2: 0000000020977000 CR3: 00000000b4c26000 CR4: 0000000000160670 [ 27.774235] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 27.774238] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 27.774240] Stack: [ 27.774241] 0000000000000000 ffff8801d1374358 ffff8800b40c79e0 ffffffff825b9ee1 [ 27.774250] ffff8801d1374370 ffffed003a26e86b ffffed003a26e86e ffff8801d1374368 [ 27.774257] dead4ead00000000 ffff8801d1374340 0000000000000000 0000000000000000 [ 27.774264] Call Trace: [ 27.774275] [] sg_remove_scat.isra.17+0x1c1/0x2d0 [ 27.774281] [] sg_finish_rem_req+0x2b5/0x340 [ 27.774288] [] sg_new_read.isra.18+0x39/0x3c0 [ 27.774294] [] ? sg_get_rq_mark+0x142/0x190 [ 27.774300] [] sg_read+0x8c2/0x1490 [ 27.774306] [] ? sg_ioctl+0x2c20/0x2c20 [ 27.774313] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.774319] [] ? fsnotify+0xee0/0xee0 [ 27.774328] [] ? avc_policy_seqno+0x9/0x20 [ 27.774337] [] do_loop_readv_writev+0x141/0x1e0 [ 27.774343] [] ? security_file_permission+0x89/0x1e0 [ 27.774350] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.774357] [] ? sg_proc_seq_show_debug+0xd30/0xd30 [ 27.774363] [] compat_do_readv_writev+0x5df/0x6e0 [ 27.774369] [] ? vfs_writev+0xb0/0xb0 [ 27.774376] [] ? __lru_cache_add+0x164/0x240 [ 27.774384] [] ? _raw_spin_unlock+0x2c/0x50 [ 27.774391] [] ? rw_verify_area+0x100/0x2f0 [ 27.774397] [] compat_readv+0xd9/0x140 [ 27.774403] [] compat_SyS_readv+0xd8/0x1b0 [ 27.774408] [] ? SyS_pwritev+0x230/0x230 [ 27.774413] [] ? SyS_pwritev+0x230/0x230 [ 27.774421] [] do_fast_syscall_32+0x314/0x890 [ 27.774427] [] sysenter_flags_fixed+0xd/0x17 [ 27.774429] Code: 96 a4 0c 00 e9 78 fd ff ff 90 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 53 48 89 fb 48 83 c7 1c 48 89 fa 48 83 ec 08 48 c1 ea 03 <0f> b6 14 02 48 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 49 [ 27.774528] RIP [] __free_pages+0x21/0x90 [ 27.774535] RSP [ 27.774541] ---[ end trace e97663df7b497249 ]--- [ 27.774545] Kernel panic - not syncing: Fatal exception [ 27.781632] Dumping ftrace buffer: [ 27.781634] (ftrace buffer empty) [ 27.781636] Kernel Offset: disabled [ 28.487406] Rebooting in 86400 seconds..