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-executor398:8002 blocked for more than 140 seconds. Not tainted 4.14.304-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor398 D27952 8002 8000 0x00000000 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_timeout+0x80a/0xe90 kernel/time/timer.c:1724 do_wait_for_common kernel/sched/completion.c:91 [inline] __wait_for_common kernel/sched/completion.c:112 [inline] wait_for_common+0x272/0x430 kernel/sched/completion.c:123 kthread_stop+0xce/0x640 kernel/kthread.c:555 ext4_put_super+0x865/0xf00 fs/ext4/super.c:988 generic_shutdown_super+0x144/0x370 fs/super.c:446 kill_block_super+0x95/0xe0 fs/super.c:1161 deactivate_locked_super+0x6c/0xd0 fs/super.c:319 deactivate_super+0x7f/0xa0 fs/super.c:350 cleanup_mnt+0x186/0x2c0 fs/namespace.c:1183 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x5e/0xd3 RIP: 0033:0x7fb82c678ce7 RSP: 002b:00007fff0778d8c8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007fb82c678ce7 RDX: 00007fff0778d98c RSI: 000000000000000a RDI: 00007fff0778d980 RBP: 00007fff0778d980 R08: 00000000ffffffff R09: 00007fff0778d760 R10: 0000555556580683 R11: 0000000000000202 R12: 00007fff0778e9f0 R13: 00005555565805f0 R14: 00007fff0778d8f0 R15: 0000000000000a97 Showing all locks held in the system: 1 lock held by khungtaskd/1534: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 1 lock held by syz-executor398/8002: #0: (&type->s_umount_key#35){++++}, at: [] deactivate_super+0x77/0xa0 fs/super.c:349 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1534 Comm: khungtaskd Not tainted 4.14.304-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x180 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x5b9/0xb40 kernel/hung_task.c:274 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:406 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 4624 Comm: systemd-journal Not tainted 4.14.304-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023 task: ffff8880a17d0140 task.stack: ffff8880a17d8000 RIP: 0010:___bpf_prog_run+0x86/0x5630 kernel/bpf/core.c:1006 RSP: 0018:ffff8880a17dfa48 EFLAGS: 00000a06 RAX: 1ffff9200035042e RBX: dffffc0000000000 RCX: ffff8880a17dfe68 RDX: ffffc90001a82170 RSI: ffffc90001a82030 RDI: ffffc90001a8216c RBP: ffff8880a17dfb58 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffffffff878f1680 R13: 1ffff110142fbf50 R14: ffffc90001a82170 R15: 0000000000000002 FS: 00007f905c25c8c0(0000) GS:ffff8880ba400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f9059789000 CR3: 00000000a1042000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: Code: 48 8d 47 30 48 89 44 24 18 48 c1 e8 03 48 01 d8 c7 44 24 14 00 00 00 00 48 89 04 24 e8 34 ee f6 ff 4c 89 f0 4c 89 f2 48 c1 e8 03 <83> e2 07 0f b6 04 18 38 d0 7f 08 84 c0 0f 85 61 3e 00 00 45 0f