Warning: Permanently added '10.128.0.100' (ECDSA) to the list of known hosts. executing program syzkaller login: [ 838.851969] audit: type=1400 audit(1602227655.559:8): avc: denied { execmem } for pid=6497 comm="syz-executor115" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=process permissive=1 [ 838.887891] NILFS (loop0): broken superblock, retrying with spare superblock (blocksize = 1024) [ 838.899605] NILFS (loop0): broken superblock, retrying with spare superblock (blocksize = 2048) [ 838.910051] NILFS (loop0): mounting unchecked fs [ 838.918475] NILFS (loop0): recovery complete [ 838.925107] NILFS (loop0): segctord starting. Construction interval = 5 seconds, CP frequency < 30 seconds [ 986.559163] INFO: task syz-executor115:6497 blocked for more than 140 seconds. [ 986.566797] Not tainted 4.19.150-syzkaller #0 [ 986.572891] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 986.581324] syz-executor115 D27792 6497 6491 0x00000000 [ 986.587130] Call Trace: [ 986.590603] __schedule+0x8e5/0x22e0 [ 986.594321] ? io_schedule_timeout+0x140/0x140 [ 986.598890] schedule+0x8d/0x1b0 [ 986.603368] wb_wait_for_completion+0x175/0x1f0 [ 986.608167] ? block_dump___mark_inode_dirty+0x2b0/0x2b0 [ 986.614557] ? wait_woken+0x320/0x320 [ 986.618362] sync_inodes_sb+0x19d/0xa20 [ 986.623111] ? lock_downgrade+0x750/0x750 [ 986.627396] ? radix_tree_tagged+0x2e/0x70 [ 986.633122] ? __filemap_fdatawrite_range+0x198/0x350 [ 986.638354] ? writeback_inodes_sb_nr+0x30/0x30 [ 986.643935] ? get_nr_dirty_inodes+0x1fc/0x2d0 [ 986.648541] sync_filesystem+0x15c/0x250 [ 986.653876] generic_shutdown_super+0x70/0x370 [ 986.658456] kill_block_super+0x97/0xf0 [ 986.663136] deactivate_locked_super+0x8c/0x100 [ 986.667802] deactivate_super+0x174/0x1a0 [ 986.672789] ? deactivate_locked_super+0x100/0x100 [ 986.677764] ? dput+0x31/0x6a0 [ 986.681662] cleanup_mnt+0x1da/0x300 [ 986.685438] task_work_run+0x141/0x1c0 [ 986.690130] exit_to_usermode_loop+0x269/0x2c0 [ 986.694706] do_syscall_64+0x57c/0x670 [ 986.698583] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 986.704771] RIP: 0033:0x44e0f7 [ 986.707972] Code: Bad RIP value. [ 986.712009] RSP: 002b:00007ffcdcc3ee78 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6 [ 986.720210] RAX: 0000000000000000 RBX: 00000000000ccd22 RCX: 000000000044e0f7 [ 986.727470] RDX: 0000000000400d27 RSI: 0000000000000002 RDI: 00007ffcdcc3ef20 [ 986.736150] RBP: 0000000000001962 R08: 0000000000000000 R09: 0000000000000009 [ 986.743965] R10: 0000000000000005 R11: 0000000000000202 R12: 00007ffcdcc3ffd0 [ 986.751774] R13: 00000000020ff880 R14: 0000000000000000 R15: 0000000000000000 [ 986.759632] [ 986.759632] Showing all locks held in the system: [ 986.765974] 1 lock held by khungtaskd/1095: [ 986.771014] #0: 0000000021f2c890 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x291 [ 986.780576] 1 lock held by in:imklog/6175: [ 986.784799] #0: 000000009c92d6ec (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xe3/0x100 [ 986.793464] 2 locks held by syz-executor115/6497: [ 986.798297] #0: 0000000014b5a469 (&type->s_umount_key#59){+.+.}, at: deactivate_super+0x16c/0x1a0 [ 986.808212] #1: 000000004ec73461 (&bdi->wb_switch_rwsem){+.+.}, at: sync_inodes_sb+0x180/0xa20 [ 986.817586] 2 locks held by kworker/u4:0/6504: [ 986.822718] #0: 0000000078c7b08b ((wq_completion)"writeback"){+.+.}, at: process_one_work+0x692/0x14e0 [ 986.832784] #1: 00000000fc6b733d ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0x6c8/0x14e0 [ 986.843832] [ 986.845455] ============================================= [ 986.845455] [ 986.853349] NMI backtrace for cpu 1 [ 986.856976] CPU: 1 PID: 1095 Comm: khungtaskd Not tainted 4.19.150-syzkaller #0 [ 986.864417] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 986.873753] Call Trace: [ 986.876327] dump_stack+0x22c/0x33e [ 986.879946] nmi_cpu_backtrace.cold+0x18/0x3d [ 986.884486] ? nmi_cpu_backtrace_handler+0x10/0x10 [ 986.889434] nmi_trigger_cpumask_backtrace+0x1a6/0x1eb [ 986.894725] watchdog+0xa62/0x1020 [ 986.898248] ? reset_hung_task_detector+0x30/0x30 [ 986.903071] kthread+0x33f/0x460 [ 986.906427] ? kthread_park+0x180/0x180 [ 986.910384] ret_from_fork+0x24/0x30 [ 986.914219] Sending NMI from CPU 1 to CPUs 0: [ 986.919084] NMI backtrace for cpu 0 [ 986.919090] CPU: 0 PID: 3718 Comm: systemd-journal Not tainted 4.19.150-syzkaller #0 [ 986.919096] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 986.919100] RIP: 0010:__sanitizer_cov_trace_pc+0x22/0x50 [ 986.919110] Code: 00 00 e9 39 ec ff ff 90 48 8b 34 24 65 48 8b 04 25 40 ee 01 00 65 8b 15 5c 1b 90 7e 81 e2 00 01 1f 00 75 2b 8b 90 e0 12 00 00 <83> fa 02 75 20 48 8b 88 e8 12 00 00 8b 80 e4 12 00 00 48 8b 11 48 [ 986.919114] RSP: 0018:ffff8880942a7dd8 EFLAGS: 00000246 [ 986.919121] RAX: ffff888093cd2180 RBX: ffff888094b3c3c0 RCX: ffffffff81bd6094 [ 986.919125] RDX: 0000000000000000 RSI: ffffffff81bd60a2 RDI: 0000000000000004 [ 986.919130] RBP: 0000000000000014 R08: 0000000000000001 R09: 0000000000000040 [ 986.919135] R10: 0000000000000004 R11: 0000000000000000 R12: 0000000000000040 [ 986.919139] R13: ffff888094b3c418 R14: 0000000000000000 R15: 0000000000004000 [ 986.919145] FS: 00007fd86f11b8c0(0000) GS:ffff8880ae200000(0000) knlGS:0000000000000000 [ 986.919149] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 986.919153] CR2: 00007fd86c4c5000 CR3: 0000000094246000 CR4: 00000000001406f0 [ 986.919158] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 986.919163] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 986.919165] Call Trace: [ 986.919168] __alloc_fd+0x1e2/0x590 [ 986.919171] do_sys_open+0x297/0x520 [ 986.919174] ? filp_open+0x70/0x70 [ 986.919178] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe [ 986.919182] ? trace_hardirqs_off_caller+0x6e/0x210 [ 986.919185] ? do_syscall_64+0x21/0x670 [ 986.919188] do_syscall_64+0xf9/0x670 [ 986.919192] entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 986.919195] RIP: 0033:0x7fd86e6ab840 [ 986.919206] Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 [ 986.919209] RSP: 002b:00007ffd093268d8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 986.919217] RAX: ffffffffffffffda RBX: 00007ffd09326be0 RCX: 00007fd86e6ab840 [ 986.919222] RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 0000560ee3d17ab0 [ 986.919227] RBP: 000000000000000d R08: 000000000000c0ff R09: 00000000ffffffff [ 986.919231] R10: 0000000000000069 R11: 0000000000000246 R12: 00000000ffffffff [ 986.919236] R13: 0000560ee3d0c060 R14: 00007ffd09326ba0 R15: 0000560ee3d18f80 [ 986.920695] Kernel panic - not syncing: hung_task: blocked tasks [ 987.151933] CPU: 1 PID: 1095 Comm: khungtaskd Not tainted 4.19.150-syzkaller #0 [ 987.159368] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 987.168699] Call Trace: [ 987.171274] dump_stack+0x22c/0x33e [ 987.174982] panic+0x2ac/0x565 [ 987.178156] ? __warn_printk+0xf3/0xf3 [ 987.182026] ? nmi_cpu_backtrace_handler+0x10/0x10 [ 987.186935] ? ___preempt_schedule+0x16/0x18 [ 987.191330] ? watchdog+0xa62/0x1020 [ 987.195026] ? nmi_trigger_cpumask_backtrace+0x15e/0x1eb [ 987.200469] watchdog+0xa73/0x1020 [ 987.203990] ? reset_hung_task_detector+0x30/0x30 [ 987.208813] kthread+0x33f/0x460 [ 987.212160] ? kthread_park+0x180/0x180 [ 987.216112] ret_from_fork+0x24/0x30 [ 987.221405] Kernel Offset: disabled [ 987.225552] Rebooting in 86400 seconds..