INFO: task syz-executor.4:7511 blocked for more than 143 seconds. Not tainted 6.1.0-rc1-syzkaller-00454-ga70385240892 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:25568 pid:7511 ppid:3623 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5191 [inline] __schedule+0xae9/0x53f0 kernel/sched/core.c:6503 schedule+0xda/0x1b0 kernel/sched/core.c:6579 wb_wait_for_completion+0x17e/0x240 fs/fs-writeback.c:191 __writeback_inodes_sb_nr+0x1d7/0x280 fs/fs-writeback.c:2620 try_to_writeback_inodes_sb+0x94/0xc0 fs/fs-writeback.c:2668 ext4_nonda_switch+0x1aa/0x1f0 fs/ext4/inode.c:2950 ext4_da_write_begin+0x16c/0xb50 fs/ext4/inode.c:2977 generic_perform_write+0x252/0x570 mm/filemap.c:3753 ext4_buffered_write_iter+0x15b/0x460 fs/ext4/file.c:285 ext4_file_write_iter+0x8b8/0x16e0 fs/ext4/file.c:700 __kernel_write_iter+0x25e/0x730 fs/read_write.c:517 dump_emit_page fs/coredump.c:857 [inline] dump_user_range+0x230/0x700 fs/coredump.c:908 elf_core_dump+0x26de/0x3510 fs/binfmt_elf.c:2311 do_coredump+0x26c5/0x3bc0 fs/coredump.c:755 get_signal+0x1be1/0x2430 kernel/signal.c:2844 arch_do_signal_or_restart+0x82/0x2300 arch/x86/kernel/signal.c:869 exit_to_user_mode_loop kernel/entry/common.c:168 [inline] exit_to_user_mode_prepare+0x15f/0x250 kernel/entry/common.c:203 irqentry_exit_to_user_mode+0x5/0x30 kernel/entry/common.c:309 asm_exc_general_protection+0x22/0x30 arch/x86/include/asm/idtentry.h:564 RIP: 0033:0x7f389188b601 RSP: 002b:0000000020000090 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007f38919abf80 RCX: 00007f389188b5f9 RDX: 00000000200000c0 RSI: 0000000020000090 RDI: 0000000040000000 RBP: 00007f38918e67b0 R08: 0000000020000140 R09: 0000000020000140 R10: 0000000020000100 R11: 0000000000000206 R12: 0000000000000000 R13: 00007fff99746ecf R14: 00007f3890fff300 R15: 0000000000022000 INFO: lockdep is turned off. NMI backtrace for cpu 1 CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.1.0-rc1-syzkaller-00454-ga70385240892 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/11/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x24/0x18a lib/nmi_backtrace.c:111 nmi_trigger_cpumask_backtrace+0x32f/0x3c0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline] watchdog+0xc71/0xfc0 kernel/hung_task.c:377 kthread+0x2e4/0x3a0 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline] NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline] NMI backtrace for cpu 0 skipped: idling at acpi_safe_halt drivers/acpi/processor_idle.c:112 [inline] NMI backtrace for cpu 0 skipped: idling at acpi_idle_do_entry+0x1fd/0x2a0 drivers/acpi/processor_idle.c:572