[ 34.187644][ T26] audit: type=1800 audit(1550867722.261:27): pid=7420 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 34.207947][ T26] audit: type=1800 audit(1550867722.281:28): pid=7420 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2417 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.016270][ T26] audit: type=1800 audit(1550867723.091:29): pid=7420 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 35.038599][ T26] audit: type=1800 audit(1550867723.091:30): pid=7420 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.250' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 44.314160][ T7573] page:ffffea00029574c0 count:0 mapcount:0 mapping:0000000000000000 index:0x0 [ 44.323156][ T7573] flags: 0x1fffc0000000000() [ 44.327849][ T7573] raw: 01fffc0000000000 ffffea00029e5948 ffffea000290f108 0000000000000000 [ 44.336561][ T7573] raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000 [ 44.345387][ T7573] page dumped because: VM_BUG_ON_PAGE(page_ref_count(page) == 0) [ 44.353305][ T7573] ------------[ cut here ]------------ [ 44.358757][ T7573] kernel BUG at include/linux/mm.h:579! [ 44.364974][ T7573] invalid opcode: 0000 [#1] PREEMPT SMP KASAN [ 44.371044][ T7573] CPU: 0 PID: 7573 Comm: syz-executor020 Not tainted 5.0.0-rc7-next-20190222 #41 [ 44.380135][ T7573] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.390201][ T7573] RIP: 0010:generic_pipe_buf_release+0x120/0x160 [ 44.396519][ T7573] Code: bd ff 4c 89 e7 e8 60 44 db ff e8 9b 28 bd ff 5b 41 5c 41 5d 5d c3 e8 8f 28 bd ff 48 c7 c6 e0 97 75 87 4c 89 e7 e8 90 dc e4 ff <0f> 0b e8 79 28 bd ff 4d 8d 65 ff e9 3d ff ff ff 48 89 df e8 58 f9 [ 44.416116][ T7573] RSP: 0018:ffff8880a1bd7920 EFLAGS: 00010293 [ 44.422167][ T7573] RAX: ffff8880879483c0 RBX: ffffea00029574f4 RCX: 0000000000000000 [ 44.430115][ T7573] RDX: 0000000000000000 RSI: ffffffff81981a22 RDI: ffffea00029574f8 [ 44.438167][ T7573] RBP: ffff8880a1bd7938 R08: 000000000000003e R09: 0000000000000000 [ 44.446128][ T7573] R10: 0000000000000000 R11: 0000000000000000 R12: ffffea00029574c0 [ 44.454089][ T7573] R13: 0000000000000000 R14: ffff88808d5c3580 R15: ffff8880a47f36c0 [ 44.462086][ T7573] FS: 000000000107d880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 44.471011][ T7573] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 44.477666][ T7573] CR2: 000000000043e580 CR3: 000000008d548000 CR4: 00000000001406f0 [ 44.485626][ T7573] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 44.493583][ T7573] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 44.501538][ T7573] Call Trace: [ 44.504828][ T7573] iter_file_splice_write+0x7d1/0xbe0 [ 44.510191][ T7573] ? atime_needs_update+0x5f0/0x5f0 [ 44.515896][ T7573] ? page_cache_pipe_buf_confirm+0x2b0/0x2b0 [ 44.521944][ T7573] ? rw_verify_area+0x118/0x360 [ 44.526791][ T7573] ? page_cache_pipe_buf_confirm+0x2b0/0x2b0 [ 44.532763][ T7573] direct_splice_actor+0x126/0x1a0 [ 44.537859][ T7573] splice_direct_to_actor+0x369/0x970 [ 44.543310][ T7573] ? generic_pipe_buf_nosteal+0x10/0x10 [ 44.548845][ T7573] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 44.555068][ T7573] ? do_splice_to+0x190/0x190 [ 44.559727][ T7573] ? rw_verify_area+0x118/0x360 [ 44.564610][ T7573] do_splice_direct+0x1da/0x2a0 [ 44.569479][ T7573] ? splice_direct_to_actor+0x970/0x970 [ 44.575019][ T7573] ? rw_verify_area+0x118/0x360 [ 44.579846][ T7573] do_sendfile+0x597/0xd00 [ 44.584256][ T7573] ? do_compat_pwritev64+0x1c0/0x1c0 [ 44.589531][ T7573] ? __fget_light+0x1a9/0x230 [ 44.594196][ T7573] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 44.600532][ T7573] __x64_sys_sendfile64+0x1dd/0x220 [ 44.605765][ T7573] ? __ia32_sys_sendfile+0x230/0x230 [ 44.611040][ T7573] ? do_syscall_64+0x26/0x610 [ 44.615699][ T7573] ? lockdep_hardirqs_on+0x418/0x5d0 [ 44.620974][ T7573] ? trace_hardirqs_on+0x67/0x230 [ 44.626037][ T7573] do_syscall_64+0x103/0x610 [ 44.630812][ T7573] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 44.636701][ T7573] RIP: 0033:0x443d49 [ 44.640668][ T7573] Code: 18 89 d0 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 7b d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00 [ 44.660526][ T7573] RSP: 002b:00007fff2d255148 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 [ 44.668928][ T7573] RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000443d49 [ 44.677093][ T7573] RDX: 0000000000000000 RSI: 0000000000000003 RDI: 0000000000000003 [ 44.685057][ T7573] RBP: 00000000006ce018 R08: 00000000004002e0 R09: 00000000004002e0 [ 44.693020][ T7573] R10: 0000000102000000 R11: 0000000000000246 R12: 0000000000401a50 [ 44.700983][ T7573] R13: 0000000000401ae0 R14: 0000000000000000 R15: 0000000000000000 [ 44.708945][ T7573] Modules linked in: [ 44.713244][ T7573] ---[ end trace 8d0406376aea898a ]--- [ 44.718725][ T7573] RIP: 0010:generic_pipe_buf_release+0x120/0x160 [ 44.725114][ T7573] Code: bd ff 4c 89 e7 e8 60 44 db ff e8 9b 28 bd ff 5b 41 5c 41 5d 5d c3 e8 8f 28 bd ff 48 c7 c6 e0 97 75 87 4c 89 e7 e8 90 dc e4 ff <0f> 0b e8 79 28 bd ff 4d 8d 65 ff e9 3d ff ff ff 48 89 df e8 58 f9 [ 44.744763][ T7573] RSP: 0018:ffff8880a1bd7920 EFLAGS: 00010293 [ 44.750819][ T7573] RAX: ffff8880879483c0 RBX: ffffea00029574f4 RCX: 0000000000000000 [ 44.758827][ T7573] RDX: 0000000000000000 RSI: ffffffff81981a22 RDI: ffffea00029574f8 [ 44.766862][ T7573] RBP: ffff8880a1bd7938 R08: 000000000000003e R09: 0000000000000000 [ 44.774859][ T7573] R10: 0000000000000000 R11: 0000000000000000 R12: ffffea00029574c0 [ 44.782895][ T7573] R13: 0000000000000000 R14: ffff88808d5c3580 R15: ffff8880a47f36c0 [ 44.790910][ T7573] FS: 000000000107d880(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 [ 44.800663][ T7573] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 44.807309][ T7573] CR2: 000000000043e580 CR3: 000000008d548000 CR4: 00000000001406f0 [ 44.815313][ T7573] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 44.823493][ T7573] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 44.831498][ T7573] Kernel panic - not syncing: Fatal exception [ 44.838630][ T7573] Kernel Offset: disabled [ 44.843100][ T7573] Rebooting in 86400 seconds..