[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[ 16.029407] random: sshd: uninitialized urandom read (32 bytes read) [?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 19.463401] random: sshd: uninitialized urandom read (32 bytes read) [ 19.753776] random: sshd: uninitialized urandom read (32 bytes read) [ 20.434484] random: sshd: uninitialized urandom read (32 bytes read) [ 73.214676] random: sshd: uninitialized urandom read (32 bytes read) Warning: Permanently added '10.128.10.20' (ECDSA) to the list of known hosts. [ 79.132089] random: sshd: uninitialized urandom read (32 bytes read) executing program executing program [ 79.218800] IPVS: ftp: loaded support on port[0] = 21 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 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 executing program [ 81.364808] kasan: CONFIG_KASAN_INLINE enabled [ 81.366672] PANIC: double fault, error_code: 0x0 [ 81.369437] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 81.374215] CPU: 1 PID: 5412 Comm: syz-executor773 Not tainted 4.18.0-rc3+ #48 [ 81.381558] general protection fault: 0000 [#1] SMP KASAN [ 81.388887] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 81.388909] RIP: 0010:__lock_acquire+0x2e/0x5020 [ 81.394429] CPU: 0 PID: 4456 Comm: syz-executor773 Not tainted 4.18.0-rc3+ #48 [ 81.403762] Code: 41 [ 81.408621] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 81.415955] 57 41 [ 81.418376] RIP: 0010:debug_check_no_obj_freed+0x1b3/0x595 [ 81.427698] 89 cf [ 81.429835] Code: ff [ 81.435450] 41 56 [ 81.437604] 48 [ 81.439993] 41 [ 81.442132] c7 [ 81.443997] 55 [ 81.445866] c0 [ 81.447739] 49 [ 81.449605] c0 [ 81.451470] 89 fd [ 81.453345] 18 b3 [ 81.455238] 41 54 [ 81.457375] 8a [ 81.459504] 45 89 [ 81.461662] 4c [ 81.463519] cc 53 [ 81.465738] 8b [ 81.467594] 65 4c [ 81.469749] 24 [ 81.471609] 8b 34 [ 81.473749] 30 [ 81.475605] 25 40 [ 81.477736] 4d [ 81.479594] ee 01 [ 81.481726] 85 [ 81.483592] 00 48 [ 81.485722] e4 0f [ 81.487589] 83 e4 [ 81.489722] 84 [ 81.491850] f0 48 [ 81.494005] 9c [ 81.495873] 81 [ 81.498000] 02 [ 81.499863] ec [ 81.501722] 00 00 31 f6 4c 89 bd 68 ff ff ff 49 89 df 89 f3 4c 89 e0 48 c1 e8 03 <42> 80 3c 30 00 0f 85 a1 02 00 00 49 8d 7c 24 18 83 c3 01 4d 8b 2c [ 81.501827] RSP: 0000:ffff8801ac646ea8 EFLAGS: 00010002 [ 81.501836] RAX: 045e3d1fffffa7fd RBX: 0000000000000002 RCX: ffffffff816017d1 [ 81.501842] RDX: ff53850fdb84ffeb RSI: 0000000000000000 RDI: ffffffff8190e8ed [ 81.501847] RBP: ffff8801ac646f98 R08: fffffbfff156a6b2 R09: fffffbfff156a6b1 [ 81.501853] R10: fffffbfff156a6b1 R11: ffffffff8ab5358b R12: 22f1e8fffffd3fe9 [ 81.501858] R13: 22f1e8fffffd3fe9 R14: dffffc0000000000 R15: ffffffff8ab53588 [ 81.501866] FS: 0000000000000000(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 81.501872] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 81.501878] CR2: ffffffff88bee950 CR3: 00000001d7fe2000 CR4: 00000000001406f0 [ 81.501887] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 81.501892] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 81.501895] Call Trace: [ 81.501920] ? free_obj_work+0xbb0/0xbb0 [ 81.501931] ? up_write+0x7b/0x220 [ 81.501943] ? up_read+0x110/0x110 [ 81.501958] kmem_cache_free+0x216/0x2d0 [ 81.501969] unlink_anon_vmas+0x5f0/0xa60 [ 81.501980] ? __put_anon_vma+0x620/0x620 [ 81.501989] ? up_write+0x7b/0x220 [ 81.502006] free_pgtables+0x271/0x380 [ 81.502016] exit_mmap+0x2d1/0x5b0 [ 81.502025] ? __ia32_sys_munmap+0x80/0x80 [ 81.502042] mmput+0x265/0x620 [ 81.502053] ? lock_downgrade+0x8a1/0x8f0 [ 81.502062] ? set_mm_exe_file+0x200/0x200 [ 81.502073] ? kasan_check_read+0x11/0x20 [ 81.502082] ? do_raw_spin_unlock+0xa7/0x2f0 [ 81.502091] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 81.502101] ? kasan_check_write+0x14/0x20 [ 81.502109] ? do_raw_spin_lock+0xc1/0x200 [ 81.502119] do_exit+0xea9/0x2750 [ 81.502130] ? mm_update_next_owner+0x9a0/0x9a0 [ 81.502140] ? profiling_store+0xd0/0xd0 [ 81.502149] ? kasan_check_write+0x14/0x20 [ 81.502157] ? do_raw_spin_lock+0xc1/0x200 [ 81.502169] ? do_coredump+0x477/0x3fff [ 81.502179] ? kasan_check_write+0x14/0x20 [ 81.502187] ? do_raw_spin_lock+0xc1/0x200 [ 81.502210] ? _raw_read_unlock_irqrestore+0x60/0xc0 [ 81.502220] ? dump_align+0xa0/0xa0 [ 81.502229] ? save_stack+0xa9/0xd0 [ 81.502238] ? save_stack+0x43/0xd0 [ 81.502247] ? __kasan_slab_free+0x11a/0x170 [ 81.502254] ? kasan_slab_free+0xe/0x10 [ 81.502263] ? kmem_cache_free+0x86/0x2d0 [ 81.502270] ? __sigqueue_free.part.29+0x7d/0xa0 [ 81.502278] ? __dequeue_signal+0x530/0x7d0 [ 81.502285] ? dequeue_signal+0xbc/0x620 [ 81.502293] ? get_signal+0x3f1/0x1970 [ 81.502305] ? do_signal+0x9c/0x21c0 [ 81.502315] ? exit_to_usermode_loop+0x2e0/0x370 [ 81.502324] ? prepare_exit_to_usermode+0x342/0x3b0 [ 81.502334] ? kasan_check_read+0x11/0x20 [ 81.502342] ? do_raw_spin_unlock+0xa7/0x2f0 [ 81.502351] ? do_raw_spin_trylock+0x1c0/0x1c0 [ 81.502361] ? kasan_check_write+0x14/0x20 [ 81.502368] ? do_raw_spin_lock+0xc1/0x200 [ 81.502379] ? trace_hardirqs_off+0xd/0x10 [ 81.502388] ? _raw_spin_unlock_irqrestore+0x63/0xc0 [ 81.502401] ? trace_hardirqs_off+0xd/0x10 [ 81.502409] ? quarantine_put+0x10d/0x1b0 [ 81.502420] ? __kasan_slab_free+0x131/0x170 [ 81.502430] ? trace_hardirqs_off+0xd/0x10 [ 81.502439] ? kmem_cache_free+0x22e/0x2d0 [ 81.502447] ? __sigqueue_free.part.29+0x7d/0xa0 [ 81.502455] ? __dequeue_signal+0xf9/0x7d0 [ 81.502469] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 81.502479] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 81.502490] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 81.502505] ? proc_coredump_connector+0x4d0/0x610 [ 81.502514] ? lock_downgrade+0x8f0/0x8f0 [ 81.502523] ? proc_comm_connector+0x500/0x500 [ 81.502533] do_group_exit+0x177/0x440 [ 81.502542] ? __ia32_sys_exit+0x50/0x50 [ 81.502552] ? kasan_check_write+0x14/0x20 [ 81.502560] ? do_raw_spin_lock+0xc1/0x200 [ 81.502570] get_signal+0x88e/0x1970 [ 81.502581] ? ptrace_notify+0x130/0x130 [ 81.502589] ? force_sig_info+0x281/0x310 [ 81.502606] ? force_sig_info_fault.constprop.33+0x2b7/0x4a0 [ 81.502618] ? is_prefetch.isra.30+0x530/0x530 [ 81.502635] do_signal+0x9c/0x21c0 [ 81.504510] 60 [ 81.506390] ? debug_object_destroy+0x2b0/0x2b0 [ 81.519872] 03 00 [ 81.525229] ? setup_sigcontext+0x7d0/0x7d0 [ 81.532462] 00 [ 81.539716] ? bad_area_nosemaphore+0x33/0x40 [ 81.546954] 48 [ 81.554210] ? __do_page_fault+0x449/0xe50 [ 81.561449] 8b [ 81.569660] ? clock_was_set_work+0x30/0x30 [ 81.575519] 45 10 [ 81.582784] ? hrtimer_nanosleep+0x620/0x620 [ 81.590020] <89> [ 81.597288] exit_to_usermode_loop+0x2e0/0x370 [ 81.599836] 94 [ 81.603878] ? syscall_slow_exit_work+0x500/0x500 [ 81.607391] 24 [ 81.610913] ? syscall_return_slowpath+0x5e0/0x5e0 [ 81.614932] 80 00 [ 81.619070] ? syscall_return_slowpath+0x31d/0x5e0 [ 81.623176] 00 00 [ 81.626748] prepare_exit_to_usermode+0x342/0x3b0 [ 81.630593] 48 ba [ 81.634124] ? perf_trace_sys_enter+0xb10/0xb10 [ 81.638316] 00 00 [ 81.641499] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 81.645966] 00 [ 81.650182] ? page_fault+0x8/0x30 [ 81.654289] 00 00 [ 81.658692] retint_user+0x8/0x18 [ 81.663240] fc ff [ 81.667466] RIP: 0033:K512_4+0x38d0/0x120c74 [ 81.671664] df [ 81.675089] Code: [ 81.679742] 48 [ 81.684558] 5f [ 81.688766] 89 [ 81.692974] 75 [ 81.696920] 84 [ 81.701125] 20 [ 81.705367] 24 [ 81.710447] 36 [ 81.714047] 98 [ 81.717646] 37 [ 81.725657] 32 [ 81.729601] RSP: 0018:ffff8801b57e1f50 EFLAGS: 00010086 [ 81.733729] 20 [ 81.738459] RAX: 0000000000000000 RBX: 1ffff10036afc467 RCX: 0000000000000002 [ 81.742841] 38 [ 81.746871] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff88f92620 [ 81.746881] RBP: ffff8801b57e22e0 R08: 0000000000000000 R09: 0000000000000000 [ 81.750745] 20 [ 81.754435] R10: ffff8801b85ff1b8 R11: ffff8801daf236b3 R12: 0000000000000000 [ 81.759167] 33 [ 81.764159] R13: ffffffff88f92620 R14: ffff8801cb864380 R15: 0000000000000002 [ 81.768273] 20 [ 81.772658] FS: 00007f149fde5700(0000) GS:ffff8801daf00000(0000) knlGS:0000000000000000 [ 81.777204] 5f [ 81.781415] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 81.785616] 5f [ 81.789832] CR2: ffff8801b57e1f48 CR3: 0000000008e6a000 CR4: 00000000001406e0 [ 81.794910] 75 [ 81.799129] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 81.803246] 20 [ 81.807631] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 81.811832] 37 [ 81.816038] Call Trace: [ 81.820763] 33 [ 81.824972] Kernel panic - not syncing: Machine halted. [ 81.830479] 36 20 38 20 33 20 5f 5f 75 20 38 30 30 20 38 20 33 20 5f 5f 75 20 00 00 00 <35> 20 33 32 20 38 20 33 20 5f 5f 75 20 39 36 20 38 20 33 20 5f 5f [ 82.144967] RSP: 002b:00007fff3c0ff260 EFLAGS: 00010217 [ 82.150311] RAX: 0000000000000000 RBX: 000000000000023c RCX: 0000000000472ca0 [ 82.157560] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00007fff3c0ff260 [ 82.164809] RBP: 000000000000023c R08: 0000000000000001 R09: 000000000206f880 [ 82.172059] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000000be [ 82.179322] R13: 0000000000013db7 R14: 0000000000000000 R15: 0000000000000000 [ 82.186577] Modules linked in: [ 82.189754] Dumping ftrace buffer: [ 82.193270] (ftrace buffer empty) [ 82.196974] ---[ end trace 0275be8b44460feb ]--- [ 82.201721] RIP: 0010:debug_check_no_obj_freed+0x1b3/0x595 [ 82.207319] Code: ff 48 c7 c0 c0 18 b3 8a 4c 8b 24 30 4d 85 e4 0f 84 9c 02 00 00 31 f6 4c 89 bd 68 ff ff ff 49 89 df 89 f3 4c 89 e0 48 c1 e8 03 <42> 80 3c 30 00 0f 85 a1 02 00 00 49 8d 7c 24 18 83 c3 01 4d 8b 2c [ 82.226504] RSP: 0000:ffff8801ac646ea8 EFLAGS: 00010002 [ 82.231863] RAX: 045e3d1fffffa7fd RBX: 0000000000000002 RCX: ffffffff816017d1 [ 82.239117] RDX: ff53850fdb84ffeb RSI: 0000000000000000 RDI: ffffffff8190e8ed [ 82.246368] RBP: ffff8801ac646f98 R08: fffffbfff156a6b2 R09: fffffbfff156a6b1 [ 82.253627] R10: fffffbfff156a6b1 R11: ffffffff8ab5358b R12: 22f1e8fffffd3fe9 [ 82.260878] R13: 22f1e8fffffd3fe9 R14: dffffc0000000000 R15: ffffffff8ab53588 [ 82.268140] FS: 0000000000000000(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000 [ 82.276349] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 82.282211] CR2: ffffffff88bee950 CR3: 00000001d7fe2000 CR4: 00000000001406f0 [ 82.289465] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 82.296715] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 82.905958] Shutting down cpus with NMI [ 82.910453] Dumping ftrace buffer: [ 82.913972] (ftrace buffer empty) [ 82.917659] Kernel Offset: disabled [ 82.921266] Rebooting in 86400 seconds..