INFO: task kworker/u4:2:42 blocked for more than 143 seconds.
Not tainted 6.8.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u4:2 state:D stack:20616 pid:42 tgid:42 ppid:2 flags:0x00004000
Workqueue: writeback wb_workfn (flush-btrfs-18)
Call Trace:
context_switch kernel/sched/core.c:5400 [inline]
__schedule+0x177f/0x49a0 kernel/sched/core.c:6727
__schedule_loop kernel/sched/core.c:6802 [inline]
schedule+0x149/0x260 kernel/sched/core.c:6817
wait_extent_bit fs/btrfs/extent-io-tree.c:822 [inline]
lock_extent+0x69d/0x860 fs/btrfs/extent-io-tree.c:1868
find_lock_delalloc_range+0x4b5/0x970 fs/btrfs/extent_io.c:395
writepage_delalloc+0x17f/0x480 fs/btrfs/extent_io.c:1217
__extent_writepage fs/btrfs/extent_io.c:1475 [inline]
extent_write_cache_pages fs/btrfs/extent_io.c:2152 [inline]
extent_writepages+0x1159/0x2580 fs/btrfs/extent_io.c:2274
do_writepages+0x3aa/0x680 mm/page-writeback.c:2553
__writeback_single_inode+0x155/0xfd0 fs/fs-writeback.c:1625
writeback_sb_inodes+0x8e3/0x1220 fs/fs-writeback.c:1916
__writeback_inodes_wb+0x11b/0x260 fs/fs-writeback.c:1987
wb_writeback+0x461/0xc80 fs/fs-writeback.c:2094
wb_check_background_flush fs/fs-writeback.c:2164 [inline]
wb_do_writeback fs/fs-writeback.c:2252 [inline]
wb_workfn+0xc33/0xfb0 fs/fs-writeback.c:2279
process_one_work kernel/workqueue.c:2633 [inline]
process_scheduled_works+0x913/0x1420 kernel/workqueue.c:2706
worker_thread+0xa5f/0x1000 kernel/workqueue.c:2787
kthread+0x2ef/0x390 kernel/kthread.c:388
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242
INFO: task syz-executor.2:6070 blocked for more than 144 seconds.
Not tainted 6.8.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2 state:D stack:25112 pid:6070 tgid:6070 ppid:5082 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5400 [inline]
__schedule+0x177f/0x49a0 kernel/sched/core.c:6727
__schedule_loop kernel/sched/core.c:6802 [inline]
schedule+0x149/0x260 kernel/sched/core.c:6817
io_schedule+0x8c/0x110 kernel/sched/core.c:9023
folio_wait_bit_common+0x881/0x12b0 mm/filemap.c:1274
btrfs_page_mkwrite+0x60d/0x10c0 fs/btrfs/inode.c:8170
do_page_mkwrite+0x19b/0x480 mm/memory.c:2966
wp_page_shared mm/memory.c:3353 [inline]
do_wp_page+0x20e3/0x4c90 mm/memory.c:3493
handle_pte_fault mm/memory.c:5160 [inline]
__handle_mm_fault+0x26ad/0x72d0 mm/memory.c:5285
handle_mm_fault+0x27e/0x770 mm/memory.c:5450
do_user_addr_fault arch/x86/mm/fault.c:1364 [inline]
handle_page_fault arch/x86/mm/fault.c:1507 [inline]
exc_page_fault+0x456/0x870 arch/x86/mm/fault.c:1563
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0033:0x7f4257a5ee58
RSP: 002b:00007fffb2715ac8 EFLAGS: 00010246
RAX: 0000000020000000 RBX: 00007fffb2715bd8 RCX: 007761722f74656e
RDX: 0000000000000008 RSI: 007761722f74656e RDI: 0000000020000000
RBP: 0000000000000032 R08: 00007f4257a00000 R09: 0000000000000001
R10: 000000008135dba5 R11: 0000000000000246 R12: 00007f4257626538
R13: fffffffffffffffe R14: 00007f4257600000 R15: 00007f4257626540
INFO: task syz-executor.2:6128 blocked for more than 145 seconds.
Not tainted 6.8.0-rc4-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2 state:D stack:22448 pid:6128 tgid:6070 ppid:5082 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5400 [inline]
__schedule+0x177f/0x49a0 kernel/sched/core.c:6727
__schedule_loop kernel/sched/core.c:6802 [inline]
schedule+0x149/0x260 kernel/sched/core.c:6817
wait_extent_bit fs/btrfs/extent-io-tree.c:822 [inline]
lock_extent+0x69d/0x860 fs/btrfs/extent-io-tree.c:1868
btrfs_page_mkwrite+0x743/0x10c0 fs/btrfs/inode.c:8180
do_page_mkwrite+0x19b/0x480 mm/memory.c:2966
wp_page_shared mm/memory.c:3353 [inline]
do_wp_page+0x20e3/0x4c90 mm/memory.c:3493
handle_pte_fault mm/memory.c:5160 [inline]
__handle_mm_fault+0x26ad/0x72d0 mm/memory.c:5285
handle_mm_fault+0x27e/0x770 mm/memory.c:5450
do_user_addr_fault arch/x86/mm/fault.c:1415 [inline]
handle_page_fault arch/x86/mm/fault.c:1507 [inline]
exc_page_fault+0x2ad/0x870 arch/x86/mm/fault.c:1563
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 cc cc cc cc 66 0f 1f 84 00 00 00 00 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: 0000:ffffc900143a7530 EFLAGS: 00050206
RAX: 0000000000000000 RBX: 0000000020000598 RCX: 0000000000000038
RDX: 0000000000000000 RSI: ffffc900143a75e0 RDI: 0000000020000560
RBP: ffffc900143a7690 R08: ffffc900143a7617 R09: 1ffff92002874ec2
R10: dffffc0000000000 R11: fffff52002874ec3 R12: 0000000000000038
R13: ffffc900143a75e0 R14: 0000000020000560 R15: ffffc900143a75e0
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+0x86/0xb0 lib/usercopy.c:41
copy_to_user include/linux/uaccess.h:191 [inline]
fiemap_fill_next_extent+0x235/0x410 fs/ioctl.c:145
emit_last_fiemap_cache fs/btrfs/extent_io.c:2555 [inline]
extent_fiemap+0x1b9c/0x1fe0 fs/btrfs/extent_io.c:3082
btrfs_fiemap+0x178/0x1f0 fs/btrfs/inode.c:7848
ioctl_fiemap fs/ioctl.c:220 [inline]
do_vfs_ioctl+0x1a02/0x2b60 fs/ioctl.c:811
__do_sys_ioctl fs/ioctl.c:869 [inline]
__se_sys_ioctl+0x81/0x170 fs/ioctl.c:857
do_syscall_64+0xf9/0x240
entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f4257a7dda9
RSP: 002b:00007f425889d0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f4257bac050 RCX: 00007f4257a7dda9
RDX: 0000000020000540 RSI: 00000000c020660b RDI: 0000000000000004
RBP: 00007f4257aca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f4257bac050 R15: 00007fffb27159e8
Showing all locks held in the system:
3 locks held by kworker/u4:1/12:
1 lock held by khungtaskd/29:
#0: ffffffff8e130ae0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#0: ffffffff8e130ae0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#0: ffffffff8e130ae0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
3 locks held by kworker/u4:2/42:
#0: ffff8880192b5d38 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline]
#0: ffff8880192b5d38 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706
#1: ffffc90000b2fd20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:2608 [inline]
#1: ffffc90000b2fd20 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x1420 kernel/workqueue.c:2706
#2: ffff8880779560e0 (&type->s_umount_key#54){++++}-{3:3}, at: super_trylock_shared+0x22/0xf0 fs/super.c:566
2 locks held by getty/4811:
#0: ffff88802b18d0a0 (&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
3 locks held by syz-executor.4/5081:
#0: ffff88802c7d20e0 (&type->s_umount_key#54){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline]
#0: ffff88802c7d20e0 (&type->s_umount_key#54){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline]
#0: ffff88802c7d20e0 (&type->s_umount_key#54){++++}-{3:3}, at: deactivate_super+0xb5/0xf0 fs/super.c:509
#1: ffff88802ff38a08 (&fs_info->ordered_operations_mutex){+.+.}-{3:3}, at: btrfs_wait_ordered_roots+0x104/0x950 fs/btrfs/ordered-data.c:745
#2: ffff888076da47a0 (&root->ordered_extent_mutex){+.+.}-{3:3}, at: btrfs_wait_ordered_extents+0x1f3/0xe20 fs/btrfs/ordered-data.c:693
1 lock held by syz-executor.0/5088:
#0: ffffffff8e136478 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:292 [inline]
#0: ffffffff8e136478 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3a3/0x890 kernel/rcu/tree_exp.h:995
3 locks held by syz-executor.2/6070:
#0: ffff888018bcf7b0 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read include/linux/mm.h:663 [inline]
#0: ffff888018bcf7b0 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x2f9/0x730 mm/memory.c:5606
#1: ffff888077956518 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x19b/0x480 mm/memory.c:2966
#2: ffff888034bab920 (&ei->i_mmap_lock){++++}-{3:3}, at: btrfs_page_mkwrite+0x603/0x10c0 fs/btrfs/inode.c:8169
4 locks held by syz-executor.2/6128:
#0: ffff888034baba98 (&sb->s_type->i_mutex_key#22){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:812 [inline]
#0: ffff888034baba98 (&sb->s_type->i_mutex_key#22){++++}-{3:3}, at: btrfs_inode_lock+0x60/0xe0 fs/btrfs/inode.c:379
#1: ffff8880244701a0 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:165 [inline]
#1: ffff8880244701a0 (&mm->mmap_lock){++++}-{3:3}, at: get_mmap_lock_carefully mm/memory.c:5477 [inline]
#1: ffff8880244701a0 (&mm->mmap_lock){++++}-{3:3}, at: lock_mm_and_find_vma+0x32/0x2e0 mm/memory.c:5537
#2: ffff888077956518 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x19b/0x480 mm/memory.c:2966
#3: ffff888034bab920 (&ei->i_mmap_lock){++++}-{3:3}, at: btrfs_page_mkwrite+0x603/0x10c0 fs/btrfs/inode.c:8169
3 locks held by udevd/7703:
1 lock held by btrfs-cleaner/8953:
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.8.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106
nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 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+0x2ef/0x390 kernel/kthread.c:388
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:242
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 5088 Comm: syz-executor.0 Not tainted 6.8.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0010:btrfs_add_delayed_tree_ref+0x0/0xfb0 fs/btrfs/delayed-ref.c:1015
Code: 8c 31 fe ff ff 48 c7 c7 bc 61 84 8f e8 59 63 3d fe e9 20 fe ff ff 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 55 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 e4 e0 48
RSP: 0018:ffffc900045068b8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff000000000002 RCX: ffff88802a468000
RDX: 0000000000000000 RSI: ffffc90004506960 RDI: ffff888034834c30
RBP: ffffc90004506a30 R08: ffffffff83c947ce R09: 1ffff11010eddc97
R10: dffffc0000000000 R11: ffffed1010eddc98 R12: ffff000000000100
R13: dffffc0000000000 R14: 0000000000000002 R15: ffffc90004506960
FS: 000055555588e480(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055a7ada85c28 CR3: 000000001f3cc000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
btrfs_free_tree_block+0x3b1/0xd40 fs/btrfs/extent-tree.c:3461
btrfs_force_cow_block+0xf37/0x1b70 fs/btrfs/ctree.c:626
btrfs_cow_block+0x35e/0xa20 fs/btrfs/ctree.c:749
btrfs_search_slot+0xbdd/0x30c0 fs/btrfs/ctree.c:2104
lookup_inline_extent_backref+0x409/0x1660 fs/btrfs/extent-tree.c:830
lookup_extent_backref fs/btrfs/extent-tree.c:1062 [inline]
__btrfs_free_extent+0x2f3/0x3910 fs/btrfs/extent-tree.c:3137
run_delayed_tree_ref fs/btrfs/extent-tree.c:1773 [inline]
run_one_delayed_ref fs/btrfs/extent-tree.c:1800 [inline]
btrfs_run_delayed_refs_for_head fs/btrfs/extent-tree.c:2065 [inline]
__btrfs_run_delayed_refs+0x130d/0x46c0 fs/btrfs/extent-tree.c:2135
btrfs_run_delayed_refs+0xe3/0x2c0 fs/btrfs/extent-tree.c:2247
commit_cowonly_roots+0x66b/0x860 fs/btrfs/transaction.c:1416
btrfs_commit_transaction+0xff5/0x3740 fs/btrfs/transaction.c:2485
close_ctree+0x3dd/0xd40 fs/btrfs/disk-io.c:4327
generic_shutdown_super+0x136/0x2d0 fs/super.c:646
kill_anon_super+0x3b/0x70 fs/super.c:1230
btrfs_kill_super+0x41/0x50 fs/btrfs/super.c:2093
deactivate_locked_super+0xc4/0x130 fs/super.c:477
cleanup_mnt+0x426/0x4c0 fs/namespace.c:1267
task_work_run+0x24e/0x310 kernel/task_work.c:180
resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
exit_to_user_mode_loop kernel/entry/common.c:108 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:201 [inline]
syscall_exit_to_user_mode+0x167/0x370 kernel/entry/common.c:212
do_syscall_64+0x108/0x240 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7f6cece7f0d7
Code: b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 b0 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007ffd9da3a6f8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f6cece7f0d7
RDX: 0000000000000000 RSI: 000000000000000a RDI: 00007ffd9da3a7b0
RBP: 00007ffd9da3a7b0 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffd9da3b870
R13: 00007f6cecec93b9 R14: 00007f6cecedd5e0 R15: 0000000000000001