INFO: task kworker/u8:10:1441 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:10 state:D stack:21176 pid:1441 tgid:1441 ppid:2 task_flags:0x4208060 flags:0x00080000
Workqueue: writeback wb_workfn (flush-btrfs-7)
Call Trace:
context_switch kernel/sched/core.c:5402 [inline]
__schedule+0x16f9/0x5500 kernel/sched/core.c:7204
__schedule_loop kernel/sched/core.c:7283 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7298
wait_extent_bit fs/btrfs/extent-io-tree.c:905 [inline]
btrfs_lock_extent_bits+0x59c/0x700 fs/btrfs/extent-io-tree.c:2008
btrfs_lock_extent fs/btrfs/extent-io-tree.h:152 [inline]
btrfs_invalidate_folio+0x440/0xc00 fs/btrfs/inode.c:7718
extent_writepage fs/btrfs/extent_io.c:1848 [inline]
extent_write_cache_pages fs/btrfs/extent_io.c:2552 [inline]
btrfs_writepages+0x12f3/0x2410 fs/btrfs/extent_io.c:2684
do_writepages+0x32e/0x550 mm/page-writeback.c:2571
__writeback_single_inode+0x133/0x10e0 fs/fs-writeback.c:1764
writeback_sb_inodes+0x97f/0x1980 fs/fs-writeback.c:2056
wb_writeback+0x445/0xb00 fs/fs-writeback.c:2241
wb_do_writeback fs/fs-writeback.c:2388 [inline]
wb_workfn+0x3fd/0xf20 fs/fs-writeback.c:2428
process_one_work+0x98b/0x1630 kernel/workqueue.c:3318
process_scheduled_works kernel/workqueue.c:3401 [inline]
worker_thread+0xb49/0x1140 kernel/workqueue.c:3482
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INFO: task syz.0.23:6023 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.23 state:D stack:22560 pid:6023 tgid:6022 ppid:5791 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5402 [inline]
__schedule+0x16f9/0x5500 kernel/sched/core.c:7204
__schedule_loop kernel/sched/core.c:7283 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7298
wb_wait_for_completion+0x3e8/0x790 fs/fs-writeback.c:227
__writeback_inodes_sb_nr+0x24c/0x2d0 fs/fs-writeback.c:2847
try_to_writeback_inodes_sb+0x9a/0xc0 fs/fs-writeback.c:2895
btrfs_start_delalloc_flush fs/btrfs/transaction.c:2182 [inline]
btrfs_commit_transaction+0x813/0x2fc0 fs/btrfs/transaction.c:2371
btrfs_sync_file+0xdf4/0x1230 fs/btrfs/file.c:1822
generic_write_sync include/linux/fs.h:2663 [inline]
btrfs_do_write_iter+0x6a9/0x840 fs/btrfs/file.c:1473
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x629/0xba0 fs/read_write.c:688
ksys_write+0x156/0x270 fs/read_write.c:740
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0x560 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f83febece59
RSP: 002b:00007f83fe246028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f83fee65fa0 RCX: 00007f83febece59
RDX: 000000000000029f RSI: 0000200000000200 RDI: 0000000000000004
RBP: 00007f83fec82d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f83fee66038 R14: 00007f83fee65fa0 R15: 00007ffe0dabfc88
INFO: task syz.0.23:6040 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.23 state:D stack:22768 pid:6040 tgid:6022 ppid:5791 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5402 [inline]
__schedule+0x16f9/0x5500 kernel/sched/core.c:7204
__schedule_loop kernel/sched/core.c:7283 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7298
wait_current_trans+0x39f/0x590 fs/btrfs/transaction.c:536
start_transaction+0xbd8/0x1820 fs/btrfs/transaction.c:716
clone_copy_inline_extent fs/btrfs/reflink.c:299 [inline]
btrfs_clone+0x1316/0x2540 fs/btrfs/reflink.c:574
btrfs_clone_files+0x271/0x3f0 fs/btrfs/reflink.c:795
btrfs_remap_file_range+0x76b/0x1320 fs/btrfs/reflink.c:948
vfs_clone_file_range+0x435/0x7b0 fs/remap_range.c:403
ioctl_file_clone fs/ioctl.c:239 [inline]
ioctl_file_clone_range fs/ioctl.c:257 [inline]
do_vfs_ioctl+0xe15/0x1540 fs/ioctl.c:544
__do_sys_ioctl fs/ioctl.c:595 [inline]
__se_sys_ioctl+0x82/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0x560 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f83febece59
RSP: 002b:00007f83fe225028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f83fee66090 RCX: 00007f83febece59
RDX: 00002000000000c0 RSI: 000000004020940d RDI: 0000000000000004
RBP: 00007f83fec82d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f83fee66128 R14: 00007f83fee66090 R15: 00007ffe0dabfc88
Showing all locks held in the system:
1 lock held by khungtaskd/38:
#0: ffffffff8dfcabc0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8dfcabc0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#0: ffffffff8dfcabc0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6777
2 locks held by kworker/u8:10/1441:
#0: ffff88801eefc138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x897/0x1630 kernel/workqueue.c:3293
#1: ffffc90006d67c40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x8be/0x1630 kernel/workqueue.c:3294
2 locks held by getty/5367:
#0: ffff888032e580a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90003cc62e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x462/0x13a0 drivers/tty/n_tty.c:2211
2 locks held by kworker/u8:4/5735:
#0: ffff88813fe84138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x897/0x1630 kernel/workqueue.c:3293
#1: ffffc90004e9fc40 (connector_reaper_work){+.+.}-{0:0}, at: process_one_work+0x8be/0x1630 kernel/workqueue.c:3294
6 locks held by syz.0.23/6023:
#0: ffff888037e7b728 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x252/0x320 fs/file.c:1260
#1: ffff888020b96480 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2733 [inline]
#1: ffff888020b96480 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x22d/0xba0 fs/read_write.c:684
#2: ffff888020b96770 (sb_internal#2){.+.+}-{0:0}, at: btrfs_sync_file+0xcae/0x1230 fs/btrfs/file.c:1729
#3: ffff88805958b110 (btrfs_trans_num_writers){++++}-{0:0}, at: join_transaction+0x612/0xd50 fs/btrfs/transaction.c:299
#4: ffff88805958b138 (btrfs_trans_num_extwriters){++++}-{0:0}, at: join_transaction+0x612/0xd50 fs/btrfs/transaction.c:299
#5: ffff888020b960d0 (&type->s_umount_key#55){++++}-{4:4}, at: try_to_writeback_inodes_sb+0x22/0xc0 fs/fs-writeback.c:2892
4 locks held by syz.0.23/6040:
#0: ffff888020b96480 (sb_writers#12){.+.+}-{0:0}, at: ioctl_file_clone fs/ioctl.c:239 [inline]
#0: ffff888020b96480 (sb_writers#12){.+.+}-{0:0}, at: ioctl_file_clone_range fs/ioctl.c:257 [inline]
#0: ffff888020b96480 (sb_writers#12){.+.+}-{0:0}, at: do_vfs_ioctl+0xe15/0x1540 fs/ioctl.c:544
#1: ffff88805906f6b0 (&sb->s_type->i_mutex_key#24){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
#1: ffff88805906f6b0 (&sb->s_type->i_mutex_key#24){+.+.}-{4:4}, at: btrfs_inode_lock+0x51/0xe0 fs/btrfs/inode.c:368
#2: ffff88805906f510 (&ei->i_mmap_lock){+.+.}-{4:4}, at: btrfs_inode_lock+0xcb/0xe0 fs/btrfs/inode.c:371
#3: ffff888020b96770 (sb_internal#2){.+.+}-{0:0}, at: clone_copy_inline_extent fs/btrfs/reflink.c:299 [inline]
#3: ffff888020b96770 (sb_internal#2){.+.+}-{0:0}, at: btrfs_clone+0x1316/0x2540 fs/btrfs/reflink.c:574
1 lock held by btrfs-transacti/6038:
#0: ffff888059588d98 (&fs_info->transaction_kthread_mutex){+.+.}-{4:4}, at: transaction_kthread+0xe6/0x450 fs/btrfs/disk-io.c:1521
1 lock held by udevd/6084:
#0: ffff88803d2aba30 (&mm->mmap_lock){++++}-{4:4}, at: mmap_write_lock_killable include/linux/mmap_lock.h:554 [inline]
#0: ffff88803d2aba30 (&mm->mmap_lock){++++}-{4:4}, at: vm_mmap_pgoff+0x237/0x4f0 mm/util.c:579
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 38 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:119
nmi_trigger_cpumask_backtrace+0x17a/0x380 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xfd3/0x1030 kernel/hung_task.c:561
kthread+0x388/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 6084 Comm: udevd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:__lock_acquire+0x19/0x2d10 kernel/locking/lockdep.c:5083
Code: cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 55 41 57 41 56 41 55 41 54 53 48 81 ec e8 00 00 00 65 48 8b 05 f7 5b d2 10 <48> 89 84 24 e0 00 00 00 65 48 8b 05 cf 5b d2 10 48 89 44 24 08 31
RSP: 0018:ffffc90004f6e9b8 EFLAGS: 00000096
RAX: 7bf29eef6b12dd00 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff99ac9418
RBP: ffffffff84b8ea04 R08: 0000000000000001 R09: 0000000000000001
R10: dffffc0000000000 R11: fffffbfff1f17d7f R12: 0000000000000000
R13: ffffffff99ac9418 R14: 0000000000000001 R15: 0000000000000046
FS: 00007f1ead091880(0000) GS:ffff888125fec000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f1eac727000 CR3: 00000000290e4000 CR4: 00000000003526f0
Call Trace:
lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5870
__raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:132 [inline]
_raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:166
debug_object_active_state+0xa4/0x260 lib/debugobjects.c:1073
debug_rcu_head_queue kernel/rcu/rcu.h:237 [inline]
kvfree_call_rcu+0x5a/0x3c0 mm/slab_common.c:1961
ma_free_rcu lib/maple_tree.c:173 [inline]
mas_free lib/maple_tree.c:1153 [inline]
mas_replace_node lib/maple_tree.c:1595 [inline]
mas_wr_node_store lib/maple_tree.c:3201 [inline]
mas_wr_store_entry+0x52fe/0x7fc0 lib/maple_tree.c:3531
mas_store_prealloc+0x69c/0xa20 lib/maple_tree.c:4936
commit_merge+0x564/0x660 mm/vma.c:766
vma_merge_existing_range mm/vma.c:988 [inline]
vma_modify+0x162c/0x1f20 mm/vma.c:1676
vma_modify_flags+0x24b/0x330 mm/vma.c:1719
mprotect_fixup+0x62a/0xb60 mm/mprotect.c:789
do_mprotect_pkey+0x8d5/0xd20 mm/mprotect.c:967
__do_sys_mprotect mm/mprotect.c:988 [inline]
__se_sys_mprotect mm/mprotect.c:985 [inline]
__x64_sys_mprotect+0x80/0x90 mm/mprotect.c:985
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x15f/0x560 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1ead1f5fe7
Code: ef e8 3d fa ff ff 84 c0 75 b9 31 db 48 83 c4 08 48 89 d8 5b 5d 41 5c 41 5d 41 5e 41 5f c3 0f 1f 44 00 00 b8 0a 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d e1 2d 0d 00 f7 d8 64 89 01 48
RSP: 002b:00007fff52ae8578 EFLAGS: 00000246 ORIG_RAX: 000000000000000a
RAX: ffffffffffffffda RBX: 0000000000000200 RCX: 00007f1ead1f5fe7
RDX: 0000000000000001 RSI: 0000000000000200 RDI: 00007f1eac727000
RBP: 0000557b07279050 R08: 0000000000000000 R09: 0000000000000200
R10: 0000557b072790b0 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000080000 R14: 0000557b07278e28 R15: 00007f1ead8d539c