INFO: task syz-executor.0:2752 blocked for more than 143 seconds. Not tainted 5.10.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:13920 pid: 2752 ppid: 2338 flags:0x00000006 Call Trace: context_switch kernel/sched/core.c:4327 [inline] __schedule+0x2bf/0x7a0 kernel/sched/core.c:5078 schedule+0x41/0xa0 kernel/sched/core.c:5157 io_schedule+0x3d/0x60 kernel/sched/core.c:6852 wait_on_page_bit_common+0x12d/0x4a0 mm/filemap.c:1273 lock_page include/linux/pagemap.h:611 [inline] write_cache_pages+0x29c/0x480 mm/page-writeback.c:2213 iomap_writepages+0x17/0x30 fs/iomap/buffered-io.c:1565 gfs2_writepages+0x61/0xa0 fs/gfs2/aops.c:216 do_writepages+0x2c/0xb0 mm/page-writeback.c:2352 __filemap_fdatawrite_range+0xc0/0x100 mm/filemap.c:422 gfs2_ordered_write fs/gfs2/log.c:643 [inline] gfs2_log_flush+0x3b7/0xc60 fs/gfs2/log.c:996 gfs2_trans_end+0x14b/0x160 fs/gfs2/trans.c:122 gfs2_page_mkwrite+0x3c7/0x5d0 fs/gfs2/file.c:544 do_page_mkwrite+0x46/0x100 mm/memory.c:2714 do_shared_fault mm/memory.c:4081 [inline] do_fault mm/memory.c:4149 [inline] handle_pte_fault mm/memory.c:4385 [inline] __handle_mm_fault mm/memory.c:4520 [inline] handle_mm_fault+0xeb7/0x17d0 mm/memory.c:4618 do_user_addr_fault arch/x86/mm/fault.c:1393 [inline] handle_page_fault arch/x86/mm/fault.c:1450 [inline] exc_page_fault+0x1b2/0x590 arch/x86/mm/fault.c:1506 asm_exc_page_fault+0x1e/0x30 arch/x86/include/asm/idtentry.h:580 RIP: 0033:0x7f394d048331 RSP: 002b:00007fffbdf8d890 EFLAGS: 00010246 RAX: 0000000020000180 RBX: 0000000000000004 RCX: 0000000000000000 RDX: 0000000000000001 RSI: 0000000000000000 RDI: 00005555561c8360 RBP: 0000000000000004 R08: 0000000000000000 R09: 0000000000000000 R10: 00007fffbdf8da00 R11: 0000000000000246 R12: 00007f394cc2f930 R13: fffffffffffffffe R14: 00007f394cc1d000 R15: 00007f394cc2f938 Showing all locks held in the system: 1 lock held by khungtaskd/301: #0: ffffffff82fd7080 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x15/0xf2 kernel/locking/lockdep.c:6255 3 locks held by kworker/u4:2/303: #0: ffff888103548938 ((wq_completion)writeback){....}-{0:0}, at: wake_up_worker kernel/workqueue.c:837 [inline] #0: ffff888103548938 ((wq_completion)writeback){....}-{0:0}, at: process_one_work+0x1bc/0x430 kernel/workqueue.c:2238 #1: ffffc90000127e70 ((work_completion)(&(&wb->dwork)->work)){....}-{0:0}, at: wake_up_worker kernel/workqueue.c:837 [inline] #1: ffffc90000127e70 ((work_completion)(&(&wb->dwork)->work)){....}-{0:0}, at: process_one_work+0x1bc/0x430 kernel/workqueue.c:2238 #2: ffff88811a1bd0e0 (&type->s_umount_key#44){....}-{3:3}, at: trylock_super+0x11/0x50 fs/super.c:418 2 locks held by getty/1714: #0: ffff888103fd8898 (&tty->ldisc_sem){....}-{0:0}, at: tty_ldisc_ref_wait+0x1f/0x50 drivers/tty/tty_ldisc.c:266 #1: ffffc90002d4b2e8 (&ldata->atomic_read_lock){....}-{3:3}, at: n_tty_read+0xd4/0x9b0 drivers/tty/n_tty.c:2158 4 locks held by syz-executor.0/2752: #0: ffff888100faa858 (&mm->mmap_lock#2){....}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:117 [inline] #0: ffff888100faa858 (&mm->mmap_lock#2){....}-{3:3}, at: do_user_addr_fault arch/x86/mm/fault.c:1344 [inline] #0: ffff888100faa858 (&mm->mmap_lock#2){....}-{3:3}, at: handle_page_fault arch/x86/mm/fault.c:1450 [inline] #0: ffff888100faa858 (&mm->mmap_lock#2){....}-{3:3}, at: exc_page_fault+0x3f8/0x590 arch/x86/mm/fault.c:1506 #1: ffff88811a1bd548 (sb_pagefaults){....}-{0:0}, at: do_page_mkwrite+0x46/0x100 mm/memory.c:2714 #2: ffff88811a1bd640 (sb_internal#2){....}-{0:0}, at: gfs2_page_mkwrite+0x368/0x5d0 fs/gfs2/file.c:522 #3: ffff88810c6eb010 (&sdp->sd_log_flush_lock){....}-{3:3}, at: gfs2_log_flush+0x43/0xc60 fs/gfs2/log.c:961 1 lock held by gfs2_logd/2755: #0: ffff88810c6eb010 (&sdp->sd_log_flush_lock){....}-{3:3}, at: gfs2_log_flush+0x43/0xc60 fs/gfs2/log.c:961 2 locks held by gfs2_quotad/2756: #0: ffff88811a1bd640 (sb_internal#2){....}-{0:0}, at: gfs2_statfs_sync+0x16e/0x1c0 fs/gfs2/super.c:367 #1: ffff88810c6eb010 (&sdp->sd_log_flush_lock){....}-{3:3}, at: gfs2_log_reserve+0x1a5/0x2d0 fs/gfs2/log.c:475 4 locks held by syz-executor.0/6493: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 301 Comm: khungtaskd Not tainted 5.10.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/26/2023 Call Trace: __dump_stack lib/dump_stack.c:79 [inline] dump_stack+0x57/0x6a lib/dump_stack.c:120 nmi_cpu_backtrace.cold+0x32/0x69 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x81/0x90 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0x4b1/0x4c0 kernel/hung_task.c:294 kthread+0x116/0x130 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296 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:60 [inline] NMI backtrace for cpu 0 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:103 [inline] NMI backtrace for cpu 0 skipped: idling at acpi_safe_halt drivers/acpi/processor_idle.c:110 [inline] NMI backtrace for cpu 0 skipped: idling at acpi_idle_do_entry+0x4a/0x50 drivers/acpi/processor_idle.c:516