INFO: task kworker/u4:6:1044 blocked for more than 143 seconds. Not tainted 6.7.0-rc4-syzkaller-00384-gb10a3ccaf6e3 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:6 state:D stack:19096 pid:1044 tgid:1044 ppid:2 flags:0x00004000 Workqueue: writeback wb_workfn (flush-btrfs-74) Call Trace: context_switch kernel/sched/core.c:5376 [inline] __schedule+0x1961/0x4ab0 kernel/sched/core.c:6688 __schedule_loop kernel/sched/core.c:6763 [inline] schedule+0x149/0x260 kernel/sched/core.c:6778 wait_extent_bit fs/btrfs/extent-io-tree.c:799 [inline] lock_extent+0x69d/0x850 fs/btrfs/extent-io-tree.c:1843 find_lock_delalloc_range+0x4b5/0x970 fs/btrfs/extent_io.c:393 writepage_delalloc+0x17f/0x470 fs/btrfs/extent_io.c:1183 __extent_writepage fs/btrfs/extent_io.c:1440 [inline] extent_write_cache_pages fs/btrfs/extent_io.c:2108 [inline] extent_writepages+0x1210/0x26a0 fs/btrfs/extent_io.c:2230 do_writepages+0x3a6/0x670 mm/page-writeback.c:2553 __writeback_single_inode+0x155/0xfc0 fs/fs-writeback.c:1625 writeback_sb_inodes+0x8e3/0x1220 fs/fs-writeback.c:1916 wb_writeback+0x44d/0xc70 fs/fs-writeback.c:2092 wb_do_writeback fs/fs-writeback.c:2239 [inline] wb_workfn+0x400/0xfb0 fs/fs-writeback.c:2279 process_one_work kernel/workqueue.c:2627 [inline] process_scheduled_works+0x90f/0x1420 kernel/workqueue.c:2700 worker_thread+0xa5f/0x1000 kernel/workqueue.c:2781 kthread+0x2d3/0x370 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 INFO: task syz-executor.4:8874 blocked for more than 144 seconds. Not tainted 6.7.0-rc4-syzkaller-00384-gb10a3ccaf6e3 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:23704 pid:8874 tgid:8872 ppid:5090 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5376 [inline] __schedule+0x1961/0x4ab0 kernel/sched/core.c:6688 __schedule_loop kernel/sched/core.c:6763 [inline] schedule+0x149/0x260 kernel/sched/core.c:6778 io_schedule+0x8c/0x100 kernel/sched/core.c:8998 folio_wait_bit_common+0x881/0x12b0 mm/filemap.c:1273 btrfs_page_mkwrite+0x4a4/0xd10 fs/btrfs/inode.c:8148 do_page_mkwrite+0x197/0x470 mm/memory.c:2944 wp_page_shared mm/memory.c:3339 [inline] do_wp_page+0x1d07/0x4d40 mm/memory.c:3479 handle_pte_fault mm/memory.c:5055 [inline] __handle_mm_fault mm/memory.c:5180 [inline] handle_mm_fault+0x1b1c/0x6680 mm/memory.c:5345 do_user_addr_fault arch/x86/mm/fault.c:1413 [inline] handle_page_fault arch/x86/mm/fault.c:1505 [inline] exc_page_fault+0x2ad/0x870 arch/x86/mm/fault.c:1561 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0010:rep_movs_alternative+0x33/0x70 arch/x86/lib/copy_user_64.S:58 Code: 40 83 f9 08 73 21 85 c9 74 0f 8a 06 88 07 48 ff c7 48 ff c6 48 ff c9 75 f1 c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 00 48 8b 06 <48> 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb RSP: 0018:ffffc90015aaf330 EFLAGS: 00050206 RAX: 0000000000000000 RBX: 0000000020000258 RCX: 0000000000000038 RDX: 0000000000000000 RSI: ffffc90015aaf3e0 RDI: 0000000020000220 RBP: ffffc90015aaf498 R08: ffffc90015aaf417 R09: 1ffff92002b55e82 R10: dffffc0000000000 R11: fffff52002b55e83 R12: 0000000000000038 R13: ffffc90015aaf3e0 R14: 0000000020000220 R15: ffffc90015aaf3e0 copy_user_generic arch/x86/include/asm/uaccess_64.h:112 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:133 [inline] _copy_to_user+0x86/0xa0 lib/usercopy.c:41 copy_to_user include/linux/uaccess.h:191 [inline] fiemap_fill_next_extent+0x235/0x410 fs/ioctl.c:145 emit_fiemap_extent+0x258/0x410 fs/btrfs/extent_io.c:2476 fiemap_process_hole+0x374/0xaf0 fs/btrfs/extent_io.c:2687 extent_fiemap+0xeae/0x1fe0 btrfs_fiemap+0x178/0x1e0 fs/btrfs/inode.c:7830 ioctl_fiemap fs/ioctl.c:220 [inline] do_vfs_ioctl+0x19ea/0x2b40 fs/ioctl.c:811 __do_sys_ioctl fs/ioctl.c:869 [inline] __se_sys_ioctl+0x81/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x45/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f770b07cba9 RSP: 002b:00007f770be430c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f770b19bf80 RCX: 00007f770b07cba9 RDX: 0000000020000200 RSI: 00000000c020660b RDI: 0000000000000004 RBP: 00007f770b0c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f770b19bf80 R15: 00007ffe13833318 INFO: task syz-executor.4:8921 blocked for more than 145 seconds. Not tainted 6.7.0-rc4-syzkaller-00384-gb10a3ccaf6e3 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:27824 pid:8921 tgid:8872 ppid:5090 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5376 [inline] __schedule+0x1961/0x4ab0 kernel/sched/core.c:6688 __schedule_loop kernel/sched/core.c:6763 [inline] schedule+0x149/0x260 kernel/sched/core.c:6778 wb_wait_for_completion+0x166/0x290 fs/fs-writeback.c:192 __writeback_inodes_sb_nr+0x2d2/0x370 fs/fs-writeback.c:2672 sync_filesystem+0xa4/0x220 fs/sync.c:54 btrfs_remount+0x231/0x14b0 fs/btrfs/super.c:1652 reconfigure_super+0x440/0x870 fs/super.c:1143 vfs_cmd_reconfigure fs/fsopen.c:267 [inline] vfs_fsconfig_locked fs/fsopen.c:296 [inline] __do_sys_fsconfig fs/fsopen.c:476 [inline] __se_sys_fsconfig+0xab5/0xec0 fs/fsopen.c:349 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x45/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f770b07cba9 RSP: 002b:00007f770be220c8 EFLAGS: 00000246 ORIG_RAX: 00000000000001af RAX: ffffffffffffffda RBX: 00007f770b19c050 RCX: 00007f770b07cba9 RDX: 0000000000000000 RSI: 0000000000000007 RDI: 0000000000000006 RBP: 00007f770b0c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f770b19c050 R15: 00007ffe13833318 Showing all locks held in the system: 3 locks held by kworker/u4:2/28: 1 lock held by khungtaskd/30: #0: ffffffff8d92d060 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline] #0: ffffffff8d92d060 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline] #0: ffffffff8d92d060 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614 2 locks held by kworker/u4:6/1044: #0: ffff88801aa4dd38 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2602 [inline] #0: ffff88801aa4dd38 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2700 #1: ffffc90004937d20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2602 [inline] #1: ffffc90004937d20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2700 3 locks held by kworker/u4:8/2428: 2 locks held by kworker/1:2/2517: #0: ffff888012c72938 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2602 [inline] #0: ffff888012c72938 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2700 #1: ffffc9000a3f7d20 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2602 [inline] #1: ffffc9000a3f7d20 ((work_completion)(&rew->rew_work)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2700 2 locks held by getty/4819: #0: ffff88814b1ea0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b4/0x1e10 drivers/tty/n_tty.c:2201 1 lock held by syz-executor.0/5086: 1 lock held by syz-executor.1/5087: #0: ffff8880266240e0 (&type->s_umount_key#52){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff8880266240e0 (&type->s_umount_key#52){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff8880266240e0 (&type->s_umount_key#52){++++}-{3:3}, at: deactivate_super+0xad/0xf0 fs/super.c:516 4 locks held by syz-executor.4/8874: #0: ffff88803bd68588 (&sb->s_type->i_mutex_key#23){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:812 [inline] #0: ffff88803bd68588 (&sb->s_type->i_mutex_key#23){++++}-{3:3}, at: btrfs_inode_lock+0x60/0xd0 fs/btrfs/inode.c:370 #1: ffff88802a4f0b20 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:165 [inline] #1: ffff88802a4f0b20 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5372 [inline] #1: ffff88802a4f0b20 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2d0 mm/memory.c:5432 #2: ffff88801e6c2510 (sb_pagefaults#3){.+.+}-{0:0}, at: do_page_mkwrite+0x197/0x470 mm/memory.c:2944 #3: ffff88803bd68410 (&ei->i_mmap_lock){++++}-{3:3}, at: btrfs_page_mkwrite+0x49c/0xd10 fs/btrfs/inode.c:8147 2 locks held by syz-executor.4/8921: #0: ffff888075e1c470 (&fc->uapi_mutex){+.+.}-{3:3}, at: __do_sys_fsconfig fs/fsopen.c:474 [inline] #0: ffff888075e1c470 (&fc->uapi_mutex){+.+.}-{3:3}, at: __se_sys_fsconfig+0x8e6/0xec0 fs/fsopen.c:349 #1: ffff88801e6c20e0 (&type->s_umount_key#78){++++}-{3:3}, at: vfs_cmd_reconfigure fs/fsopen.c:266 [inline] #1: ffff88801e6c20e0 (&type->s_umount_key#78){++++}-{3:3}, at: vfs_fsconfig_locked fs/fsopen.c:296 [inline] #1: ffff88801e6c20e0 (&type->s_umount_key#78){++++}-{3:3}, at: __do_sys_fsconfig fs/fsopen.c:476 [inline] #1: ffff88801e6c20e0 (&type->s_umount_key#78){++++}-{3:3}, at: __se_sys_fsconfig+0xaab/0xec0 fs/fsopen.c:349 1 lock held by syz-executor.2/9849: #0: ffff88801e6c20e0 (&type->s_umount_key#78){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88801e6c20e0 (&type->s_umount_key#78){++++}-{3:3}, at: super_lock+0x176/0x3a0 fs/super.c:117 1 lock held by syz-executor.2/9855: #0: ffff88801e6c20e0 (&type->s_umount_key#78){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88801e6c20e0 (&type->s_umount_key#78){++++}-{3:3}, at: super_lock+0x176/0x3a0 fs/super.c:117 1 lock held by syz-executor.3/9980: #0: ffff88801e6c20e0 (&type->s_umount_key#78){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88801e6c20e0 (&type->s_umount_key#78){++++}-{3:3}, at: super_lock+0x176/0x3a0 fs/super.c:117 1 lock held by syz-executor.3/9982: #0: ffff88801e6c20e0 (&type->s_umount_key#78){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88801e6c20e0 (&type->s_umount_key#78){++++}-{3:3}, at: super_lock+0x176/0x3a0 fs/super.c:117 2 locks held by syz-executor.5/9990: 1 lock held by syz-executor.0/9993: 2 locks held by syz-executor.1/9995: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 30 Comm: khungtaskd Not tainted 6.7.0-rc4-syzkaller-00384-gb10a3ccaf6e3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 nmi_cpu_backtrace+0x498/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x198/0x310 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xfaf/0xff0 kernel/hung_task.c:379 kthread+0x2d3/0x370 kernel/kthread.c:388 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 9991 Comm: syz-executor.2 Not tainted 6.7.0-rc4-syzkaller-00384-gb10a3ccaf6e3 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 RIP: 0010:clear_page_erms+0xb/0x10 arch/x86/lib/clear_page_64.S:50 Code: 48 89 47 20 48 89 47 28 48 89 47 30 48 89 47 38 48 8d 7f 40 75 d9 90 c3 0f 1f 80 00 00 00 00 f3 0f 1e fa b9 00 10 00 00 31 c0 aa c3 66 90 f3 0f 1e fa 48 83 f9 40 73 36 83 f9 08 73 0f 85 c9 RSP: 0018:ffffc9000a6477d8 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000d40 RDX: ffff8880549df000 RSI: 0000000000000001 RDI: ffff8880549df2c0 RBP: ffffc9000a647a90 R08: ffffea00015277f7 R09: 0000000000000000 R10: ffffed100a93be00 R11: fffff940002a4eff R12: 0000000000000001 R13: 0000000000000001 R14: ffffea00015277c0 R15: 0000000000000000 FS: 0000555555e48480(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fcf6d79bf40 CR3: 000000001c513000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: clear_page arch/x86/include/asm/page_64.h:53 [inline] clear_highpage_kasan_tagged include/linux/highmem.h:248 [inline] kernel_init_pages mm/page_alloc.c:1072 [inline] post_alloc_hook+0xf8/0x210 mm/page_alloc.c:1535 prep_new_page mm/page_alloc.c:1544 [inline] get_page_from_freelist+0x33ea/0x3570 mm/page_alloc.c:3312 __alloc_pages+0x255/0x680 mm/page_alloc.c:4568 alloc_pages_mpol+0x3de/0x640 mm/mempolicy.c:2133 vm_area_alloc_pages mm/vmalloc.c:3063 [inline] __vmalloc_area_node mm/vmalloc.c:3139 [inline] __vmalloc_node_range+0x9a3/0x14a0 mm/vmalloc.c:3320 vmalloc_user+0x74/0x80 mm/vmalloc.c:3474 kcov_ioctl+0x59/0x630 kernel/kcov.c:704 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xf8/0x170 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x45/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7fcf6d67c90b Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00 RSP: 002b:00007ffeb12f0070 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fcf6d67c90b RDX: 0000000000040000 RSI: ffffffff80086301 RDI: 00000000000000d7 RBP: 00007fcf6d79bf40 R08: 00000000000000da R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffeb12f07a8 R13: 0000000000000003 R14: 00007fcf6d79c9d8 R15: 000000000000000c