[ 36.976749] audit: type=1800 audit(1550851713.093:27): pid=7551 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2436 res=0 [ 37.001274] audit: type=1800 audit(1550851713.103:28): pid=7551 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2417 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c. [ 37.509175] audit: type=1800 audit(1550851713.693:29): pid=7551 uid=0 auid=4294967295 ses=4294967295 subj=_ op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 37.528068] audit: type=1800 audit(1550851713.693:30): pid=7551 uid=0 auid=4294967295 ses=4294967295 subj=_ 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 '10.128.0.205' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program syzkaller login: [ 1110.380623] hrtimer: interrupt took 43746 ns [ 1243.394415] rcu: rcu_check_gp_start_stall: g5060->5064 gar:13284 ga:13298 f0x1 gs:1 rcu_preempt->state:0x0 [ 1243.404581] WARNING: CPU: 0 PID: 7725 at kernel/rcu/tree.c:2666 rcu_check_gp_start_stall.cold+0x7f/0xb1 [ 1243.414116] Kernel panic - not syncing: panic_on_warn set ... [ 1243.420009] CPU: 0 PID: 7725 Comm: syz-executor653 Not tainted 5.0.0-rc7+ #82 [ 1243.427295] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 1243.436665] Call Trace: [ 1243.439252] <IRQ> [ 1243.441421] dump_stack+0x172/0x1f0 [ 1243.445072] ? rcu_check_callbacks.cold+0x9f9/0xa4a [ 1243.450098] panic+0x2cb/0x65c [ 1243.453296] ? __warn_printk+0xf3/0xf3 [ 1243.457200] ? rcu_check_gp_start_stall.cold+0x7f/0xb1 [ 1243.462505] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 1243.468061] ? __warn.cold+0x5/0x45 [ 1243.471694] ? __warn+0xe8/0x1d0 [ 1243.475072] ? rcu_check_gp_start_stall.cold+0x7f/0xb1 [ 1243.480354] __warn.cold+0x20/0x45 [ 1243.483921] ? wake_up_klogd+0x99/0xd0 [ 1243.487821] ? rcu_check_gp_start_stall.cold+0x7f/0xb1 [ 1243.493111] report_bug+0x263/0x2b0 [ 1243.496748] do_error_trap+0x11b/0x200 [ 1243.500648] do_invalid_op+0x37/0x50 [ 1243.504369] ? rcu_check_gp_start_stall.cold+0x7f/0xb1 [ 1243.509660] invalid_op+0x14/0x20 [ 1243.513170] RIP: 0010:rcu_check_gp_start_stall.cold+0x7f/0xb1 [ 1243.519075] Code: 48 8b 0d 93 ae 3b 07 4c 2b 0d 1c c4 3b 07 50 0f bf 05 a4 c1 3b 07 48 8b 15 45 c1 3b 07 4c 2b 05 0e c4 3b 07 50 e8 a4 c5 fb ff <0f> 0b 48 83 c4 20 49 81 fc 00 69 9a 88 74 0c 48 c7 c7 00 69 9a 88 [ 1243.537984] RSP: 0018:ffff8880ae807dc0 EFLAGS: 00010086 [ 1243.543350] RAX: 000000000000005e RBX: ffff8880aa254280 RCX: 0000000000000000 [ 1243.550631] RDX: 0000000000000000 RSI: ffffffff815a92c6 RDI: ffffed1015d00faa [ 1243.557916] RBP: ffff8880ae807e00 R08: 000000000000005e R09: ffffed1015d05021 [ 1243.565189] R10: ffffed1015d05020 R11: ffff8880ae828107 R12: ffffffff889a6900 [ 1243.572471] R13: 0000000100017001 R14: 0000000000000286 R15: dffffc0000000000 [ 1243.579778] ? vprintk_func+0x86/0x189 [ 1243.583718] rcu_process_callbacks+0x3ba/0x1390 [ 1243.588405] ? rcu_check_gp_start_stall+0x240/0x240 [ 1243.593425] ? __lock_is_held+0xb6/0x140 [ 1243.597499] ? check_preemption_disabled+0x48/0x290 [ 1243.602533] ? rcu_lockdep_current_cpu_online+0xe3/0x130 [ 1243.608002] __do_softirq+0x266/0x95a [ 1243.611819] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 1243.617367] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 1243.622953] irq_exit+0x180/0x1d0 [ 1243.626415] smp_apic_timer_interrupt+0x14a/0x570 [ 1243.631272] apic_timer_interrupt+0xf/0x20 [ 1243.635509] </IRQ> [ 1243.637758] RIP: 0010:ktime_get_coarse_real_ts64+0x11e/0x2b0 [ 1243.643568] Code: 82 92 88 48 c1 e8 03 42 80 3c 30 00 0f 85 7a 01 00 00 48 83 3d d2 26 31 07 00 0f 84 0d 01 00 00 e8 57 85 0e 00 4c 89 ef 57 9d <0f> 1f 44 00 00 e8 48 85 0e 00 44 8b 2d 81 cb 39 07 31 ff 44 89 ee [ 1243.662580] RSP: 0018:ffff88808cec7448 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 [ 1243.670318] RAX: ffff8880873c2480 RBX: ffff88808cec74b0 RCX: 1ffff11010e785a9 [ 1243.678116] RDX: 0000000000000000 RSI: ffffffff81615c29 RDI: 0000000000000293 [ 1243.685392] RBP: ffff88808cec7480 R08: ffff8880873c2480 R09: ffff8880873c2d48 [ 1243.692675] R10: 0000000000000000 R11: 0000000000000000 R12: fffffbfff112505d [ 1243.699969] R13: 0000000000000293 R14: dffffc0000000000 R15: 1ffffffff112505f [ 1243.707313] ? ktime_get_coarse_real_ts64+0x119/0x2b0 [ 1243.712536] current_time+0x6b/0x140 [ 1243.716327] ? timespec64_trunc+0x180/0x180 [ 1243.720683] ? file_remove_privs+0x213/0x480 [ 1243.725127] ? dentry_needs_remove_privs.part.0+0x80/0x80 [ 1243.730692] file_update_time+0x119/0x4f0 [ 1243.734875] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 1243.739918] ? current_time+0x140/0x140 [ 1243.743925] ? generic_write_check_limits+0x2a0/0x2a0 [ 1243.749140] ? lock_acquire+0x16f/0x3f0 [ 1243.753134] ? ext4_file_write_iter+0x250/0x1160 [ 1243.757918] __generic_file_write_iter+0x1cf/0x630 [ 1243.762884] ext4_file_write_iter+0x33f/0x1160 [ 1243.767498] ? ext4_file_mmap+0x410/0x410 [ 1243.771666] ? iter_file_splice_write+0x16e/0xbe0 [ 1243.776535] ? splice_direct_to_actor+0x369/0x970 [ 1243.781868] ? do_splice_direct+0x1da/0x2a0 [ 1243.786210] ? do_sendfile+0x597/0xd00 [ 1243.790131] ? __x64_sys_sendfile64+0x15a/0x220 [ 1243.794828] ? do_syscall_64+0x103/0x610 [ 1243.799400] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1243.804812] ? mark_held_locks+0x100/0x100 [ 1243.809071] ? current_time+0x6b/0x140 [ 1243.812978] ? find_held_lock+0x35/0x130 [ 1243.817067] do_iter_readv_writev+0x5e0/0x8e0 [ 1243.821594] ? vfs_dedupe_file_range+0x780/0x780 [ 1243.826360] ? __lock_is_held+0xb6/0x140 [ 1243.830439] ? rw_verify_area+0x118/0x360 [ 1243.834616] do_iter_write+0x184/0x610 [ 1243.838516] ? rcu_read_lock_sched_held+0x110/0x130 [ 1243.843546] ? __kmalloc+0x5d5/0x740 [ 1243.847283] vfs_iter_write+0x77/0xb0 [ 1243.851104] iter_file_splice_write+0x667/0xbe0 [ 1243.855804] ? atime_needs_update+0x5f0/0x5f0 [ 1243.860353] ? page_cache_pipe_buf_confirm+0x2b0/0x2b0 [ 1243.865664] ? rw_verify_area+0x118/0x360 [ 1243.869831] ? page_cache_pipe_buf_confirm+0x2b0/0x2b0 [ 1243.875127] direct_splice_actor+0x126/0x1a0 [ 1243.879566] splice_direct_to_actor+0x369/0x970 [ 1243.884269] ? generic_pipe_buf_nosteal+0x10/0x10 [ 1243.889131] ? do_splice_to+0x190/0x190 [ 1243.893127] ? rw_verify_area+0x118/0x360 [ 1243.897302] do_splice_direct+0x1da/0x2a0 [ 1243.901468] ? splice_direct_to_actor+0x970/0x970 [ 1243.906333] ? rcu_read_lock_sched_held+0x110/0x130 [ 1243.911374] ? rcu_sync_lockdep_assert+0x73/0xb0 [ 1243.916143] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 1243.921732] ? __sb_start_write+0x1ac/0x360 [ 1243.926117] do_sendfile+0x597/0xd00 [ 1243.929850] ? do_compat_pwritev64+0x1c0/0x1c0 [ 1243.934455] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 1243.940008] ? _copy_from_user+0xdd/0x150 [ 1243.944244] __x64_sys_sendfile64+0x15a/0x220 [ 1243.948842] ? __ia32_sys_sendfile+0x230/0x230 [ 1243.953439] ? do_syscall_64+0x26/0x610 [ 1243.957451] ? lockdep_hardirqs_on+0x415/0x5d0 [ 1243.962047] ? trace_hardirqs_on+0x67/0x230 [ 1243.966382] do_syscall_64+0x103/0x610 [ 1243.970286] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 1243.975483] RIP: 0033:0x446a59 [ 1243.978686] Code: e8 dc e6 ff ff 48 83 c4 18 c3 0f 1f 80 00 00 00 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 4b 07 fc ff c3 66 2e 0f 1f 84 00 00 00 00 [ 1243.997604] RSP: 002b:00007f44528abdb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 [ 1244.005334] RAX: ffffffffffffffda RBX: 00000000006dcc28 RCX: 0000000000446a59 [ 1244.012619] RDX: 0000000020000000 RSI: 0000000000000003 RDI: 0000000000000003 [ 1244.019910] RBP: 00000000006dcc20 R08: 0000000000000000 R09: 0000000000000000 [ 1244.027209] R10: 00008080fffffffe R11: 0000000000000246 R12: 00000000006dcc2c [ 1244.034513] R13: 00007ffc5728919f R14: 00007f44528ac9c0 R15: 20c49ba5e353f7cf [ 1244.043167] Kernel Offset: disabled [ 1244.046905] Rebooting in 86400 seconds..