EXT4-fs (loop0): re-mounted. Opts: (null) EXT4-fs (loop0): re-mounted. Opts: (null) EXT4-fs (loop0): re-mounted. Opts: (null) EXT4-fs (loop0): re-mounted. Opts: (null) INFO: task syz-executor388:8109 blocked for more than 140 seconds. Not tainted 4.19.191-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor388 D27744 8109 8107 0x00000000 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 schedule_timeout+0x92d/0xfe0 kernel/time/timer.c:1794 do_wait_for_common kernel/sched/completion.c:83 [inline] __wait_for_common kernel/sched/completion.c:104 [inline] wait_for_common+0x29c/0x470 kernel/sched/completion.c:115 kthread_stop+0x109/0x6b0 kernel/kthread.c:588 ext4_put_super+0x93c/0x1010 fs/ext4/super.c:1054 generic_shutdown_super+0x144/0x370 fs/super.c:456 kill_block_super+0x97/0xf0 fs/super.c:1185 deactivate_locked_super+0x94/0x160 fs/super.c:329 deactivate_super+0x174/0x1a0 fs/super.c:360 cleanup_mnt+0x1a8/0x290 fs/namespace.c:1098 task_work_run+0x148/0x1c0 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:193 [inline] exit_to_usermode_loop+0x251/0x2a0 arch/x86/entry/common.c:167 prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline] syscall_return_slowpath arch/x86/entry/common.c:271 [inline] do_syscall_64+0x538/0x620 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4461d7 Code: Bad RIP value. RSP: 002b:00007ffdbf70f8a8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00000000000e04e7 RCX: 00000000004461d7 RDX: 00007ffdbf70f96b RSI: 0000000000000002 RDI: 00007ffdbf70f960 RBP: 00007ffdbf70f960 R08: 00000000ffffffff R09: 00007ffdbf70f740 R10: 000000000185f663 R11: 0000000000000202 R12: 00007ffdbf7109d0 R13: 000000000185f5f0 R14: 00007ffdbf70f8d0 R15: 0000000000000314 Showing all locks held in the system: 1 lock held by khungtaskd/1570: #0: 00000000fcf5113a (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7799: #0: 000000009009cf18 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 1 lock held by syz-executor388/8109: #0: 000000006cadba91 (&type->s_umount_key#36){++++}, at: deactivate_super+0x16c/0x1a0 fs/super.c:359 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1570 Comm: khungtaskd Not tainted 4.19.191-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4693 Comm: systemd-journal Not tainted 4.19.191-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:_raw_spin_lock+0x0/0x40 kernel/locking/spinlock.c:143 Code: 58 82 f1 89 e8 21 18 80 f9 e9 2d fe ff ff 48 89 df e8 14 18 80 f9 e9 63 fe ff ff 4c 89 ef e8 27 19 80 f9 e9 2e ff ff ff 90 90 <55> 48 89 fd bf 01 00 00 00 e8 e2 47 29 f9 45 31 c9 41 b8 01 00 00 RSP: 0018:ffff8880a0d3fc40 EFLAGS: 00000082 RAX: 0000000000000001 RBX: 0000000000000001 RCX: 0000000000000000 RDX: dffffc0000000000 RSI: 00000000ffffffff RDI: ffff8880ba02b040 RBP: ffff8880a0d3fd10 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000005 R11: 0000000000000000 R12: ffff8880a0d325c0 R13: 000000000002b040 R14: ffff8880a0d38000 R15: ffff8880ba02b040 FS: 00007f0f2b0798c0(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0f2848c000 CR3: 00000000a137f000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: rq_lock kernel/sched/sched.h:1824 [inline] __schedule+0x1f9/0x2040 kernel/sched/core.c:3455 preempt_schedule_irq+0xb0/0x140 kernel/sched/core.c:3744 retint_kernel+0x1b/0x2d RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:789 [inline] RIP: 0010:slab_alloc mm/slab.c:3390 [inline] RIP: 0010:kmem_cache_alloc+0x2c4/0x370 mm/slab.c:3557 Code: 00 48 c7 c7 db 43 b8 89 e8 19 83 a9 ff e9 b5 fd ff ff e8 df ad cf ff 48 83 3d 4f 93 59 08 00 0f 84 ae 00 00 00 4c 89 ff 57 9d <0f> 1f 44 00 00 e9 1c fe ff ff 65 ff 05 fb ef 69 7e 48 8b 05 4c ea RSP: 0018:ffff8880a0d3fdf8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000007 RBX: 00000000006000c0 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000282 RBP: 00000000006000c0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880b3cba800 R13: ffff88823b843380 R14: ffff88823b843380 R15: 0000000000000282 getname_flags+0xce/0x590 fs/namei.c:140 getname fs/namei.c:211 [inline] user_path_create fs/namei.c:3696 [inline] do_mkdirat+0x8d/0x2d0 fs/namei.c:3834 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f0f2a334687 Code: 00 b8 ff ff ff ff c3 0f 1f 40 00 48 8b 05 09 d8 2b 00 64 c7 00 5f 00 00 00 b8 ff ff ff ff c3 0f 1f 40 00 b8 53 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 d7 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007fff61747458 EFLAGS: 00000293 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 00007fff6174a4c0 RCX: 00007f0f2a334687 RDX: 0000000000000000 RSI: 00000000000001ed RDI: 0000562d0f8058a0 RBP: 00007fff61747490 R08: 0000562d0df743e5 R09: 0000000000000018 R10: 0000000000000069 R11: 0000000000000293 R12: 0000000000000000 R13: 0000000000000001 R14: 0000562d0f8058a0 R15: 00007fff61747ad0