INFO: task kworker/u8:6:2912 blocked for more than 143 seconds.
Not tainted 6.14.0-syzkaller-01103-g2df0c02dab82 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:6 state:D stack:24552 pid:2912 tgid:2912 ppid:2 task_flags:0x4248060 flags:0x00004000
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
context_switch kernel/sched/core.c:5367 [inline]
__schedule+0x1129/0x5c00 kernel/sched/core.c:6748
__schedule_loop kernel/sched/core.c:6825 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6840
io_schedule+0xbf/0x130 kernel/sched/core.c:7722
folio_wait_bit_common+0x3d8/0x9c0 mm/filemap.c:1317
folio_lock include/linux/pagemap.h:1165 [inline]
mpage_prepare_extent_to_map+0xa0f/0x1460 fs/ext4/inode.c:2480
ext4_do_writepages+0x966/0x3360 fs/ext4/inode.c:2688
ext4_writepages+0x302/0x730 fs/ext4/inode.c:2824
do_writepages+0x1b2/0x820 mm/page-writeback.c:2687
__writeback_single_inode+0x160/0xfb0 fs/fs-writeback.c:1680
writeback_sb_inodes+0x601/0xf90 fs/fs-writeback.c:1976
__writeback_inodes_wb+0xf8/0x2d0 fs/fs-writeback.c:2047
wb_writeback+0x7f3/0xb70 fs/fs-writeback.c:2158
wb_check_background_flush fs/fs-writeback.c:2228 [inline]
wb_do_writeback fs/fs-writeback.c:2316 [inline]
wb_workfn+0x748/0xbe0 fs/fs-writeback.c:2343
process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c1/0xef0 kernel/workqueue.c:3400
kthread+0x3a4/0x760 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INFO: task jbd2/sda1-8:5172 blocked for more than 143 seconds.
Not tainted 6.14.0-syzkaller-01103-g2df0c02dab82 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:jbd2/sda1-8 state:D stack:26968 pid:5172 tgid:5172 ppid:2 task_flags:0x240040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5367 [inline]
__schedule+0x1129/0x5c00 kernel/sched/core.c:6748
__schedule_loop kernel/sched/core.c:6825 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6840
io_schedule+0xbf/0x130 kernel/sched/core.c:7722
bit_wait_io+0x15/0xe0 kernel/sched/wait_bit.c:247
__wait_on_bit+0x62/0x180 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0xd9/0x110 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
__wait_on_buffer+0x64/0x70 fs/buffer.c:123
wait_on_buffer include/linux/buffer_head.h:414 [inline]
jbd2_journal_commit_transaction+0x382c/0x6890 fs/jbd2/commit.c:810
kjournald2+0x1f4/0x760 fs/jbd2/journal.c:201
kthread+0x3a4/0x760 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INFO: task syz-executor:5822 blocked for more than 144 seconds.
Not tainted 6.14.0-syzkaller-01103-g2df0c02dab82 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:23312 pid:5822 tgid:5822 ppid:5820 task_flags:0x440100 flags:0x00000002
Call Trace:
context_switch kernel/sched/core.c:5367 [inline]
__schedule+0x1129/0x5c00 kernel/sched/core.c:6748
__schedule_loop kernel/sched/core.c:6825 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6840
io_schedule+0xbf/0x130 kernel/sched/core.c:7722
bit_wait_io+0x15/0xe0 kernel/sched/wait_bit.c:247
__wait_on_bit+0x62/0x180 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0xd9/0x110 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
do_get_write_access+0x93d/0x12a0 fs/jbd2/transaction.c:1096
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1245
__ext4_journal_get_write_access+0x6a/0x340 fs/ext4/ext4_jbd2.c:239
ext4_reserve_inode_write+0x13b/0x270 fs/ext4/inode.c:5835
__ext4_mark_inode_dirty+0x197/0x870 fs/ext4/inode.c:6009
ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:6046
__mark_inode_dirty+0x1eb/0xe50 fs/fs-writeback.c:2515
generic_update_time+0xcf/0xf0 fs/inode.c:2064
inode_update_time fs/inode.c:2077 [inline]
__file_update_time fs/inode.c:2305 [inline]
file_update_time+0x17d/0x1c0 fs/inode.c:2335
ext4_page_mkwrite+0x367/0x1760 fs/ext4/inode.c:6164
do_page_mkwrite+0x177/0x380 mm/memory.c:3256
wp_page_shared mm/memory.c:3657 [inline]
do_wp_page+0xc47/0x4820 mm/memory.c:3807
handle_pte_fault mm/memory.c:5904 [inline]
__handle_mm_fault+0x1ae0/0x2a50 mm/memory.c:6031
handle_mm_fault+0x3fa/0xaa0 mm/memory.c:6200
do_user_addr_fault+0x609/0x1430 arch/x86/mm/fault.c:1337
handle_page_fault arch/x86/mm/fault.c:1480 [inline]
exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1538
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7fe4f9e765ef
RSP: 002b:00007ffd87e760d0 EFLAGS: 00010202
RAX: 00007fe4f8ef0000 RBX: 000055556deb4d70 RCX: 0000000000000004
RDX: 1ffffffff0430274 RSI: 000055556deb4d58 RDI: 0000000000000010
RBP: 00007ffd87e763c0 R08: 000055556deb4d60 R09: 000000000000204e
R10: 0000000000000001 R11: 00007ffd87e765d0 R12: 00007ffd87e76420
R13: 0000000000000004 R14: 00007ffd87e76140 R15: 00007ffd87e76210
INFO: task syz.0.3971:25349 blocked for more than 144 seconds.
Not tainted 6.14.0-syzkaller-01103-g2df0c02dab82 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.3971 state:D stack:29192 pid:25349 tgid:25347 ppid:15339 task_flags:0x400040 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5367 [inline]
__schedule+0x1129/0x5c00 kernel/sched/core.c:6748
__schedule_loop kernel/sched/core.c:6825 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6840
io_schedule+0xbf/0x130 kernel/sched/core.c:7722
folio_wait_bit_common+0x3d8/0x9c0 mm/filemap.c:1317
folio_wait_writeback+0x3c/0x90 mm/page-writeback.c:3179
__filemap_fdatawait_range+0x11f/0x200 mm/filemap.c:541
file_write_and_wait_range+0x101/0x140 mm/filemap.c:800
ext4_sync_file+0x282/0xed0 fs/ext4/fsync.c:158
vfs_fsync_range+0x136/0x220 fs/sync.c:187
__do_sys_msync+0x3d1/0x5c0 mm/msync.c:96
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f11da18d169
RSP: 002b:00007f11daff8038 EFLAGS: 00000246 ORIG_RAX: 000000000000001a
RAX: ffffffffffffffda RBX: 00007f11da3a6080 RCX: 00007f11da18d169
RDX: 0000000000000006 RSI: 0000002000000005 RDI: 0000000000000000
RBP: 00007f11da20e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f11da3a6080 R15: 00007ffdeb6cd5d8
INFO: task syz.1.3975:25368 blocked for more than 144 seconds.
Not tainted 6.14.0-syzkaller-01103-g2df0c02dab82 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.3975 state:D stack:26584 pid:25368 tgid:25368 ppid:20145 task_flags:0x440040 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5367 [inline]
__schedule+0x1129/0x5c00 kernel/sched/core.c:6748
__schedule_loop kernel/sched/core.c:6825 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6840
io_schedule+0xbf/0x130 kernel/sched/core.c:7722
bit_wait_io+0x15/0xe0 kernel/sched/wait_bit.c:247
__wait_on_bit+0x62/0x180 kernel/sched/wait_bit.c:49
out_of_line_wait_on_bit+0xd9/0x110 kernel/sched/wait_bit.c:64
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
do_get_write_access+0x93d/0x12a0 fs/jbd2/transaction.c:1096
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1245
__ext4_journal_get_write_access+0x6a/0x340 fs/ext4/ext4_jbd2.c:239
ext4_reserve_inode_write+0x13b/0x270 fs/ext4/inode.c:5835
__ext4_mark_inode_dirty+0x197/0x870 fs/ext4/inode.c:6009
ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:6046
__mark_inode_dirty+0x1eb/0xe50 fs/fs-writeback.c:2515
generic_update_time+0xcf/0xf0 fs/inode.c:2064
inode_update_time fs/inode.c:2077 [inline]
__file_update_time fs/inode.c:2305 [inline]
file_update_time+0x17d/0x1c0 fs/inode.c:2335
ext4_page_mkwrite+0x367/0x1760 fs/ext4/inode.c:6164
do_page_mkwrite+0x177/0x380 mm/memory.c:3256
do_shared_fault mm/memory.c:5485 [inline]
do_fault mm/memory.c:5547 [inline]
do_pte_missing+0x29c/0x3ea0 mm/memory.c:4059
handle_pte_fault mm/memory.c:5888 [inline]
__handle_mm_fault+0x1043/0x2a50 mm/memory.c:6031
handle_mm_fault+0x3fa/0xaa0 mm/memory.c:6200
do_user_addr_fault+0x609/0x1430 arch/x86/mm/fault.c:1337
handle_page_fault arch/x86/mm/fault.c:1480 [inline]
exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1538
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f381ca6d2fa
RSP: 002b:00007ffff7acd1a0 EFLAGS: 00010202
RAX: 0000001b2e6f5000 RBX: 00007f381d8d5720 RCX: 0000001b2e6f4ff8
RDX: 0000001b2e320220 RSI: 0000000000000008 RDI: 00007f381d8d5720
RBP: ffffffff82056220 R08: 00007f381cda6038 R09: 00007f381cd92000
R10: 00007f381c1ff008 R11: 0000000000000016 R12: 0000000000000016
R13: 000000000000047e R14: ffffffff82056922 R15: 0000000000031609
INFO: task syz.9.3974:25371 blocked for more than 144 seconds.
Not tainted 6.14.0-syzkaller-01103-g2df0c02dab82 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.9.3974 state:D stack:28344 pid:25371 tgid:25370 ppid:19940 task_flags:0x440040 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5367 [inline]
__schedule+0x1129/0x5c00 kernel/sched/core.c:6748
__schedule_loop kernel/sched/core.c:6825 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6840
io_schedule+0xbf/0x130 kernel/sched/core.c:7722
folio_wait_bit_common+0x3d8/0x9c0 mm/filemap.c:1317
folio_wait_writeback+0x3c/0x90 mm/page-writeback.c:3179
mpage_prepare_extent_to_map+0x535/0x1460 fs/ext4/inode.c:2496
ext4_do_writepages+0x966/0x3360 fs/ext4/inode.c:2688
ext4_writepages+0x302/0x730 fs/ext4/inode.c:2824
do_writepages+0x1b2/0x820 mm/page-writeback.c:2687
filemap_fdatawrite_wbc mm/filemap.c:388 [inline]
filemap_fdatawrite_wbc+0x104/0x160 mm/filemap.c:378
__filemap_fdatawrite_range+0xb2/0xf0 mm/filemap.c:421
file_write_and_wait_range+0xca/0x140 mm/filemap.c:796
ext4_sync_file+0x282/0xed0 fs/ext4/fsync.c:158
vfs_fsync_range+0x136/0x220 fs/sync.c:187
__do_sys_msync+0x3d1/0x5c0 mm/msync.c:96
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f364198d169
RSP: 002b:00007f36428d0038 EFLAGS: 00000246 ORIG_RAX: 000000000000001a
RAX: ffffffffffffffda RBX: 00007f3641ba5fa0 RCX: 00007f364198d169
RDX: 0000000400000004 RSI: 0180000000000000 RDI: 000000001ffff000
RBP: 00007f3641a0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f3641ba5fa0 R15: 00007ffe59e9acf8
INFO: task syz.9.3974:25372 blocked for more than 145 seconds.
Not tainted 6.14.0-syzkaller-01103-g2df0c02dab82 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.9.3974 state:D stack:28264 pid:25372 tgid:25370 ppid:19940 task_flags:0x440040 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5367 [inline]
__schedule+0x1129/0x5c00 kernel/sched/core.c:6748
__schedule_loop kernel/sched/core.c:6825 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6840
io_schedule+0xbf/0x130 kernel/sched/core.c:7722
folio_wait_bit_common+0x3d8/0x9c0 mm/filemap.c:1317
folio_lock include/linux/pagemap.h:1165 [inline]
mpage_prepare_extent_to_map+0xa0f/0x1460 fs/ext4/inode.c:2480
ext4_do_writepages+0x966/0x3360 fs/ext4/inode.c:2688
ext4_writepages+0x302/0x730 fs/ext4/inode.c:2824
do_writepages+0x1b2/0x820 mm/page-writeback.c:2687
filemap_fdatawrite_wbc mm/filemap.c:388 [inline]
filemap_fdatawrite_wbc+0x104/0x160 mm/filemap.c:378
__filemap_fdatawrite_range+0xb2/0xf0 mm/filemap.c:421
file_write_and_wait_range+0xca/0x140 mm/filemap.c:796
ext4_sync_file+0x282/0xed0 fs/ext4/fsync.c:158
vfs_fsync_range+0x136/0x220 fs/sync.c:187
__do_sys_msync+0x3d1/0x5c0 mm/msync.c:96
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x260 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f364198d169
RSP: 002b:00007f36428af038 EFLAGS: 00000246 ORIG_RAX: 000000000000001a
RAX: ffffffffffffffda RBX: 00007f3641ba6080 RCX: 00007f364198d169
RDX: 0000000400000004 RSI: 0180000000000000 RDI: 000000001ffff000
RBP: 00007f3641a0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f3641ba6080 R15: 00007ffe59e9acf8
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e1be0c0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e1be0c0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e1be0c0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6761
4 locks held by kworker/u8:6/2912:
#0: ffff8881412ec948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1: ffffc9000bf0fd18 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
#2: ffff88814ed760e0 (&type->s_umount_key#31){++++}-{4:4}, at: super_trylock_shared+0x1e/0xf0 fs/super.c:562
#3: ffff88814ed78b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: do_writepages+0x1b2/0x820 mm/page-writeback.c:2687
3 locks held by syz-executor/5822:
#0: ffff88802f0f0220 (&vma->vm_lock->lock){++++}-{4:4}, at: vma_start_read include/linux/mm.h:717 [inline]
#0: ffff88802f0f0220 (&vma->vm_lock->lock){++++}-{4:4}, at: lock_vma_under_rcu+0x13d/0x980 mm/memory.c:6366
#1: ffff88814ed76518 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x177/0x380 mm/memory.c:3256
#2: ffff88814ed7a950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x5e4/0x1480 fs/jbd2/transaction.c:448
2 locks held by getty/23308:
#0: ffff88803511a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc900045fb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0xfa1/0x1450 drivers/tty/n_tty.c:2211
3 locks held by syz.1.3975/25368:
#0: ffff88808228b658 (&vma->vm_lock->lock){++++}-{4:4}, at: vma_start_read include/linux/mm.h:717 [inline]
#0: ffff88808228b658 (&vma->vm_lock->lock){++++}-{4:4}, at: lock_vma_under_rcu+0x13d/0x980 mm/memory.c:6366
#1: ffff88814ed76518 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x177/0x380 mm/memory.c:3256
#2: ffff88814ed7a950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x5e4/0x1480 fs/jbd2/transaction.c:448
1 lock held by syz.9.3974/25371:
#0: ffff88814ed78b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: do_writepages+0x1b2/0x820 mm/page-writeback.c:2687
1 lock held by syz.9.3974/25372:
#0: ffff88814ed78b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: do_writepages+0x1b2/0x820 mm/page-writeback.c:2687
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.14.0-syzkaller-01103-g2df0c02dab82 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:236 [inline]
watchdog+0xf70/0x12c0 kernel/hung_task.c:399
kthread+0x3a4/0x760 kernel/kthread.c:464
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
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 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:48 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:106 [inline]
NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt+0x1a/0x20 drivers/acpi/processor_idle.c:111