INFO: task kworker/u8:1:13 blocked for more than 143 seconds.
Tainted: G U 6.15.0-rc2-syzkaller-00037-g834a4a689699 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:1 state:D stack:23000 pid:13 tgid:13 ppid:2 task_flags:0x4248160 flags:0x00004000
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x116f/0x5de0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6860
io_schedule+0xbf/0x130 kernel/sched/core.c:7742
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:413 [inline]
ext4_wait_block_bitmap+0x14e/0x1f0 fs/ext4/balloc.c:580
ext4_read_block_bitmap+0x4e/0xa0 fs/ext4/balloc.c:603
ext4_mb_mark_context+0x11b/0xd40 fs/ext4/mballoc.c:3995
ext4_mb_mark_diskspace_used+0x466/0x8c0 fs/ext4/mballoc.c:4131
ext4_mb_new_blocks+0xa5b/0x4f00 fs/ext4/mballoc.c:6233
ext4_new_meta_blocks+0x30d/0x370 fs/ext4/balloc.c:750
ext4_ext_grow_indepth fs/ext4/extents.c:1329 [inline]
ext4_ext_create_new_leaf fs/ext4/extents.c:1433 [inline]
ext4_ext_insert_extent+0xd1d/0x4610 fs/ext4/extents.c:2115
ext4_ext_map_blocks+0x205b/0x5d60 fs/ext4/extents.c:4400
ext4_map_create_blocks fs/ext4/inode.c:520 [inline]
ext4_map_blocks+0x45b/0x1390 fs/ext4/inode.c:706
mpage_map_one_extent fs/ext4/inode.c:2224 [inline]
mpage_map_and_submit_extent fs/ext4/inode.c:2277 [inline]
ext4_do_writepages+0x1a2c/0x3490 fs/ext4/inode.c:2739
ext4_writepages+0x37a/0x7d0 fs/ext4/inode.c:2829
do_writepages+0x1b2/0x820 mm/page-writeback.c:2656
__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_old_data_flush fs/fs-writeback.c:2262 [inline]
wb_do_writeback fs/fs-writeback.c:2315 [inline]
wb_workfn+0x8ca/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+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c2/0x780 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/sda1-8:5173 blocked for more than 143 seconds.
Tainted: G U 6.15.0-rc2-syzkaller-00037-g834a4a689699 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:jbd2/sda1-8 state:D stack:26360 pid:5173 tgid:5173 ppid:2 task_flags:0x240040 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x116f/0x5de0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6860
jbd2_journal_wait_updates+0x11e/0x240 fs/jbd2/transaction.c:843
jbd2_journal_commit_transaction+0x828/0x6830 fs/jbd2/commit.c:454
kjournald2+0x1f4/0x760 fs/jbd2/journal.c:201
kthread+0x3c2/0x780 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:5829 blocked for more than 144 seconds.
Tainted: G U 6.15.0-rc2-syzkaller-00037-g834a4a689699 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:23112 pid:5829 tgid:5829 ppid:5827 task_flags:0x400100 flags:0x00000002
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x116f/0x5de0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6860
wait_transaction_locked+0x1a1/0x230 fs/jbd2/transaction.c:152
add_transaction_credits+0x110/0xe60 fs/jbd2/transaction.c:222
start_this_handle+0x3e7/0x1410 fs/jbd2/transaction.c:403
jbd2__journal_start+0x394/0x6a0 fs/jbd2/transaction.c:501
__ext4_journal_start_sb+0x195/0x690 fs/ext4/ext4_jbd2.c:114
__ext4_journal_start fs/ext4/ext4_jbd2.h:242 [inline]
ext4_dirty_inode+0xa1/0x130 fs/ext4/inode.c:6100
__mark_inode_dirty+0x1eb/0xe50 fs/fs-writeback.c:2527
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+0x35e/0x1750 fs/ext4/inode.c:6221
do_page_mkwrite+0x171/0x380 mm/memory.c:3287
wp_page_shared mm/memory.c:3688 [inline]
do_wp_page+0xb9e/0x59f0 mm/memory.c:3907
handle_pte_fault mm/memory.c:6013 [inline]
__handle_mm_fault+0x1ada/0x2a40 mm/memory.c:6140
handle_mm_fault+0x3fe/0xad0 mm/memory.c:6309
do_user_addr_fault+0x60c/0x1370 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: 0033:0x7fe3d44671e5
RSP: 002b:00007ffe053fe340 EFLAGS: 00010206
RAX: 00007fe3cdfde6c8 RBX: 00007ffe053fe440 RCX: 0000000000000000
RDX: 00007fe3cdfde6c4 RSI: 0000000000000008 RDI: 00007ffe053fe440
RBP: 00000000000003e6 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffe053fe420 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000021938 R14: fffffffffffde6c8 R15: 0000000000021938
INFO: task syz.2.203:6753 blocked for more than 144 seconds.
Tainted: G U 6.15.0-rc2-syzkaller-00037-g834a4a689699 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.203 state:D stack:26488 pid:6753 tgid:6753 ppid:5840 task_flags:0x400040 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x116f/0x5de0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6860
wait_transaction_locked+0x1a1/0x230 fs/jbd2/transaction.c:152
add_transaction_credits+0x110/0xe60 fs/jbd2/transaction.c:222
start_this_handle+0x3e7/0x1410 fs/jbd2/transaction.c:403
jbd2__journal_start+0x394/0x6a0 fs/jbd2/transaction.c:501
__ext4_journal_start_sb+0x195/0x690 fs/ext4/ext4_jbd2.c:114
__ext4_journal_start fs/ext4/ext4_jbd2.h:242 [inline]
ext4_dirty_inode+0xa1/0x130 fs/ext4/inode.c:6100
__mark_inode_dirty+0x1eb/0xe50 fs/fs-writeback.c:2527
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+0x35e/0x1750 fs/ext4/inode.c:6221
do_page_mkwrite+0x171/0x380 mm/memory.c:3287
do_shared_fault mm/memory.c:5594 [inline]
do_fault mm/memory.c:5656 [inline]
do_pte_missing+0x29c/0x3fb0 mm/memory.c:4160
handle_pte_fault mm/memory.c:5997 [inline]
__handle_mm_fault+0x103d/0x2a40 mm/memory.c:6140
handle_mm_fault+0x3fe/0xad0 mm/memory.c:6309
do_user_addr_fault+0x60c/0x1370 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: 0033:0x7fe36fe6d2fa
RSP: 002b:00007ffe3292cd60 EFLAGS: 00010202
RAX: 0000001b30c15000 RBX: 00007fe370cd5720 RCX: 0000001b30c14ff8
RDX: 0000001b30820220 RSI: 0000000000000008 RDI: 00007fe370cd5720
RBP: ffffffff81f93516 R08: 00007fe3701a6038 R09: 00007fe370192000
R10: 00007fe36f5ff008 R11: 0000000000000007 R12: 0000000000000007
R13: 000000000000036b R14: ffffffff81f9347d R15: 0000000000000c9c
INFO: task syz.1.204:6757 blocked for more than 144 seconds.
Tainted: G U 6.15.0-rc2-syzkaller-00037-g834a4a689699 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.204 state:D stack:28792 pid:6757 tgid:6757 ppid:5839 task_flags:0x400040 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x116f/0x5de0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6860
wait_transaction_locked+0x1a1/0x230 fs/jbd2/transaction.c:152
add_transaction_credits+0x110/0xe60 fs/jbd2/transaction.c:222
start_this_handle+0x3e7/0x1410 fs/jbd2/transaction.c:403
jbd2__journal_start+0x394/0x6a0 fs/jbd2/transaction.c:501
__ext4_journal_start_sb+0x195/0x690 fs/ext4/ext4_jbd2.c:114
__ext4_journal_start fs/ext4/ext4_jbd2.h:242 [inline]
ext4_dirty_inode+0xa1/0x130 fs/ext4/inode.c:6100
__mark_inode_dirty+0x1eb/0xe50 fs/fs-writeback.c:2527
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+0x35e/0x1750 fs/ext4/inode.c:6221
do_page_mkwrite+0x171/0x380 mm/memory.c:3287
do_shared_fault mm/memory.c:5594 [inline]
do_fault mm/memory.c:5656 [inline]
do_pte_missing+0x29c/0x3fb0 mm/memory.c:4160
handle_pte_fault mm/memory.c:5997 [inline]
__handle_mm_fault+0x103d/0x2a40 mm/memory.c:6140
handle_mm_fault+0x3fe/0xad0 mm/memory.c:6309
do_user_addr_fault+0x60c/0x1370 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: 0033:0x7f5e7be63c9b
RSP: 002b:00007fffd4365620 EFLAGS: 00010246
RAX: 00000000003ffde8 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000001b30720000 RSI: 0000000000400000 RDI: 00007f5e7c096410
RBP: 0000000000000000 R08: 0000000000000004 R09: 0000000000040000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 00000000000927c0 R14: 000000000001db1e R15: 00007fffd43658d0
INFO: task syz.0.205:6759 blocked for more than 145 seconds.
Tainted: G U 6.15.0-rc2-syzkaller-00037-g834a4a689699 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.205 state:D stack:28184 pid:6759 tgid:6759 ppid:5838 task_flags:0x400040 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5382 [inline]
__schedule+0x116f/0x5de0 kernel/sched/core.c:6767
__schedule_loop kernel/sched/core.c:6845 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6860
wait_transaction_locked+0x1a1/0x230 fs/jbd2/transaction.c:152
add_transaction_credits+0x110/0xe60 fs/jbd2/transaction.c:222
start_this_handle+0x3e7/0x1410 fs/jbd2/transaction.c:403
jbd2__journal_start+0x394/0x6a0 fs/jbd2/transaction.c:501
__ext4_journal_start_sb+0x195/0x690 fs/ext4/ext4_jbd2.c:114
__ext4_journal_start fs/ext4/ext4_jbd2.h:242 [inline]
ext4_dirty_inode+0xa1/0x130 fs/ext4/inode.c:6100
__mark_inode_dirty+0x1eb/0xe50 fs/fs-writeback.c:2527
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+0x35e/0x1750 fs/ext4/inode.c:6221
do_page_mkwrite+0x171/0x380 mm/memory.c:3287
do_shared_fault mm/memory.c:5594 [inline]
do_fault mm/memory.c:5656 [inline]
do_pte_missing+0x29c/0x3fb0 mm/memory.c:4160
handle_pte_fault mm/memory.c:5997 [inline]
__handle_mm_fault+0x103d/0x2a40 mm/memory.c:6140
handle_mm_fault+0x3fe/0xad0 mm/memory.c:6309
do_user_addr_fault+0x60c/0x1370 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: 0033:0x7f730ba63c9b
RSP: 002b:00007ffd9a163a90 EFLAGS: 00010246
RAX: 000000000003fde8 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000001b30620000 RSI: 0000000000040000 RDI: 00007f730bc96410
RBP: 0000000000000000 R08: 0000000000000009 R09: 00007ffd9a1637d5
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 00000000000927c0 R14: 000000000001dbba R15: 00007ffd9a163d40
Showing all locks held in the system:
6 locks held by kworker/u8:1/13:
#0: ffff8880216f9948 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1: ffffc90000127d18 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
#2: ffff888033c820e0 (&type->s_umount_key#32){++++}-{4:4}, at: super_trylock_shared+0x1e/0xf0 fs/super.c:562
#3: ffff888033c84b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: do_writepages+0x1b2/0x820 mm/page-writeback.c:2656
#4: ffff888033c86950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x5e4/0x1410 fs/jbd2/transaction.c:444
#5: ffff88807a98dbf0 (&ei->i_data_sem){++++}-{4:4}, at: ext4_map_blocks+0x355/0x1390 fs/ext4/inode.c:705
1 lock held by khungtaskd/31:
#0: ffffffff8e3c15c0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e3c15c0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e3c15c0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6764
2 locks held by getty/5589:
#0: ffff88814d1eb0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc9000332e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41b/0x14f0 drivers/tty/n_tty.c:2222
2 locks held by syz-executor/5829:
#0: ffff88803311dbc8 (vm_lock){++++}-{0:0}, at: do_user_addr_fault+0x452/0x1370 arch/x86/mm/fault.c:1328
#1: ffff888033c82518 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x171/0x380 mm/memory.c:3287
2 locks held by syz.2.203/6753:
#0: ffff88807d992a88 (vm_lock){++++}-{0:0}, at: do_user_addr_fault+0x452/0x1370 arch/x86/mm/fault.c:1328
#1: ffff888033c82518 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x171/0x380 mm/memory.c:3287
2 locks held by syz.1.204/6757:
#0: ffff88801f712448 (vm_lock){++++}-{0:0}, at: do_user_addr_fault+0x452/0x1370 arch/x86/mm/fault.c:1328
#1: ffff888033c82518 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x171/0x380 mm/memory.c:3287
2 locks held by syz.0.205/6759:
#0: ffff88803432da88 (vm_lock){++++}-{0:0}, at: do_user_addr_fault+0x452/0x1370 arch/x86/mm/fault.c:1328
#1: ffff888033c82518 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x171/0x380 mm/memory.c:3287
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Tainted: G U 6.15.0-rc2-syzkaller-00037-g834a4a689699 #0 PREEMPT(full)
Tainted: [U]=USER
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:274 [inline]
watchdog+0xf70/0x12c0 kernel/hung_task.c:437
kthread+0x3c2/0x780 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
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G U 6.15.0-rc2-syzkaller-00037-g834a4a689699 #0 PREEMPT(full)
Tainted: [U]=USER
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:81
Code: 55 5f 02 c3 cc cc cc cc 0f 1f 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 93 bc 19 00 fb f4 cc cc cc cc 66 2e 0f 1f 84 00 00 00 00 00 66 90 90 90 90 90 90
RSP: 0018:ffffc90000197df8 EFLAGS: 000002c6
RAX: 00000000001380ef RBX: 0000000000000001 RCX: ffffffff8b703439
RDX: 0000000000000000 RSI: ffffffff8dbeb4ff RDI: ffffffff8bf45100
RBP: ffffed1003b59b40 R08: 0000000000000001 R09: ffffed10170a65bd
R10: ffff8880b8532deb R11: 0000000000000000 R12: 0000000000000001
R13: ffff88801dacda00 R14: ffffffff90868010 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff888124ab7000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000559bd6482680 CR3: 000000000e182000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:107 [inline]
default_idle+0x13/0x20 arch/x86/kernel/process.c:748
default_idle_call+0x6d/0xb0 kernel/sched/idle.c:117
cpuidle_idle_call kernel/sched/idle.c:185 [inline]
do_idle+0x391/0x510 kernel/sched/idle.c:325
cpu_startup_entry+0x4f/0x60 kernel/sched/idle.c:423
start_secondary+0x21d/0x2b0 arch/x86/kernel/smpboot.c:315
common_startup_64+0x13e/0x148