INFO: task jbd2/sda1-8:4948 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:jbd2/sda1-8     state:D stack:26280 pid:4948  tgid:4948  ppid:2      task_flags:0x240040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5527 [inline]
 __schedule+0x17dd/0x5940 kernel/sched/core.c:7295
 __schedule_loop kernel/sched/core.c:7372 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7387
 jbd2_journal_wait_updates+0x19a/0x280 fs/jbd2/transaction.c:844
 jbd2_journal_commit_transaction+0x93f/0x5c80 fs/jbd2/commit.c:482
 kjournald2+0x3bc/0x740 fs/jbd2/journal.c:200
 kthread+0x38b/0x480 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
 </TASK>
INFO: task syz-executor:5607 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:22376 pid:5607  tgid:5607  ppid:5606   task_flags:0x400100 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5527 [inline]
 __schedule+0x17dd/0x5940 kernel/sched/core.c:7295
 __schedule_loop kernel/sched/core.c:7372 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7387
 wait_transaction_locked+0x1d6/0x280 fs/jbd2/transaction.c:152
 add_transaction_credits fs/jbd2/transaction.c:-1 [inline]
 start_this_handle+0x7e6/0x21f0 fs/jbd2/transaction.c:403
 jbd2__journal_start+0x2c0/0x5d0 fs/jbd2/transaction.c:502
 __ext4_journal_start_sb+0x205/0x780 fs/ext4/ext4_jbd2.c:122
 __ext4_journal_start fs/ext4/ext4_jbd2.h:238 [inline]
 ext4_dirty_inode+0x93/0x110 fs/ext4/inode.c:6733
 __mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2729
 generic_update_time fs/inode.c:2254 [inline]
 file_update_time_flags+0x399/0x440 fs/inode.c:2484
 ext4_page_mkwrite+0x21f/0x12c0 fs/ext4/inode.c:6902
 do_page_mkwrite+0x147/0x310 mm/memory.c:3779
 do_shared_fault mm/memory.c:6045 [inline]
 do_fault mm/memory.c:6107 [inline]
 do_pte_missing+0x757/0x34b0 mm/memory.c:4663
 handle_pte_fault mm/memory.c:6527 [inline]
 __handle_mm_fault mm/memory.c:6676 [inline]
 handle_mm_fault+0x1a53/0x3750 mm/memory.c:6843
 do_user_addr_fault+0xb35/0x1480 arch/x86/mm/fault.c:1343
 handle_page_fault arch/x86/mm/fault.c:1483 [inline]
 exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7f0e1d0701e3
RSP: 002b:00007ffd898b1730 EFLAGS: 00010206
RAX: 00007f0e1a3cdbe0 RBX: 00007ffd898b1860 RCX: 0000000000000000
RDX: 00007f0e1a3cdbdc RSI: 0000000000000008 RDI: 00007ffd898b1860
RBP: 00000000000003e6 R08: 0000000000000000 R09: 0000000000000000
R10: 00007ffd898b1840 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000032420 R14: fffffffffffcdbe0 R15: 0000000000000000
 </TASK>
INFO: task kworker/u8:14:5919 blocked in I/O wait for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:14   state:D stack:22848 pid:5919  tgid:5919  ppid:2      task_flags:0x4248060 flags:0x00080000
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5527 [inline]
 __schedule+0x17dd/0x5940 kernel/sched/core.c:7295
 __schedule_loop kernel/sched/core.c:7372 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7387
 io_schedule+0x7f/0xd0 kernel/sched/core.c:8059
 bit_wait_io+0x13/0x110 kernel/sched/wait_bit.c:258
 __wait_on_bit_lock+0xc9/0x5a0 kernel/sched/wait_bit.c:93
 out_of_line_wait_on_bit_lock+0x13b/0x190 kernel/sched/wait_bit.c:120
 lock_buffer include/linux/buffer_head.h:456 [inline]
 do_get_write_access+0x1b7/0x10c0 fs/jbd2/transaction.c:969
 jbd2_journal_get_write_access+0x1d7/0x230 fs/jbd2/transaction.c:1263
 __ext4_journal_get_write_access+0xec/0x620 fs/ext4/ext4_jbd2.c:249
 ext4_mb_mark_context+0x171/0xec0 fs/ext4/mballoc.c:4112
 ext4_mb_mark_diskspace_used+0x338/0x760 fs/ext4/mballoc.c:4241
 ext4_mb_new_blocks+0x1062/0x4520 fs/ext4/mballoc.c:6329
 ext4_ext_map_blocks+0x13f1/0x5680 fs/ext4/extents.c:4469
 ext4_map_create_blocks+0x116/0x530 fs/ext4/inode.c:630
 ext4_map_blocks+0x791/0x12c0 fs/ext4/inode.c:823
 mpage_map_one_extent fs/ext4/inode.c:2379 [inline]
 mpage_map_and_submit_extent fs/ext4/inode.c:2469 [inline]
 ext4_do_writepages+0x2398/0x4770 fs/ext4/inode.c:2938
 ext4_writepages+0x1fe/0x4e0 fs/ext4/inode.c:3032
 do_writepages+0x338/0x560 mm/page-writeback.c:2560
 __writeback_single_inode+0x136/0x1220 fs/fs-writeback.c:1788
 writeback_sb_inodes+0x9de/0x1af0 fs/fs-writeback.c:2099
 __writeback_inodes_wb+0x114/0x240 fs/fs-writeback.c:2175
 wb_writeback+0x42f/0xad0 fs/fs-writeback.c:2286
 wb_check_old_data_flush fs/fs-writeback.c:2390 [inline]
 wb_do_writeback fs/fs-writeback.c:2469 [inline]
 wb_workfn+0xc92/0x10f0 fs/fs-writeback.c:2497
 process_one_work kernel/workqueue.c:3407 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3490
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3571
 kthread+0x38b/0x480 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
 </TASK>
INFO: task syz.2.33:6004 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.2.33        state:D stack:25288 pid:6004  tgid:6004  ppid:5618   task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5527 [inline]
 __schedule+0x17dd/0x5940 kernel/sched/core.c:7295
 __schedule_loop kernel/sched/core.c:7372 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7387
 wait_transaction_locked+0x1d6/0x280 fs/jbd2/transaction.c:152
 add_transaction_credits fs/jbd2/transaction.c:-1 [inline]
 start_this_handle+0x7e6/0x21f0 fs/jbd2/transaction.c:403
 jbd2__journal_start+0x2c0/0x5d0 fs/jbd2/transaction.c:502
 __ext4_journal_start_sb+0x205/0x780 fs/ext4/ext4_jbd2.c:122
 __ext4_journal_start fs/ext4/ext4_jbd2.h:238 [inline]
 ext4_dirty_inode+0x93/0x110 fs/ext4/inode.c:6733
 __mark_inode_dirty+0x3a8/0x13b0 fs/fs-writeback.c:2729
 generic_update_time fs/inode.c:2254 [inline]
 file_update_time_flags+0x399/0x440 fs/inode.c:2484
 ext4_page_mkwrite+0x21f/0x12c0 fs/ext4/inode.c:6902
 do_page_mkwrite+0x147/0x310 mm/memory.c:3779
 do_shared_fault mm/memory.c:6045 [inline]
 do_fault mm/memory.c:6107 [inline]
 do_pte_missing+0x757/0x34b0 mm/memory.c:4663
 handle_pte_fault mm/memory.c:6527 [inline]
 __handle_mm_fault mm/memory.c:6676 [inline]
 handle_mm_fault+0x1a53/0x3750 mm/memory.c:6843
 do_user_addr_fault+0xb35/0x1480 arch/x86/mm/fault.c:1343
 handle_page_fault arch/x86/mm/fault.c:1483 [inline]
 exc_page_fault+0x6a/0xc0 arch/x86/mm/fault.c:1536
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:595
RIP: 0033:0x7f265046baa3
RSP: 002b:00007ffe422f6b60 EFLAGS: 00010246
RAX: 000000000003fde8 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000001b33a24000 RSI: 0000000000040000 RDI: 00007f26507e0708
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 00007ffe422f6df0
 </TASK>

Showing all locks held in the system:
locks held by khungtaskd/34: 1, last CPU#0:
 #0: ffffffff8ed5db60 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff8ed5db60 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8ed5db60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6871
locks held by getty/5376: 2, on CPU#0:
 #0: ffff8880342c30a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000322b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360 drivers/tty/n_tty.c:2211
locks held by syz-executor/5607: 2, on CPU#0:
 #0: ffff88807476c808 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:309
 #1: ffff8880341c4558 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
 #1: ffff8880341c4558 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1fd/0x12c0 fs/ext4/inode.c:6901
locks held by kworker/u8:14/5919: 6, on CPU#1:
 #0: ffff88801feff140 ((wq_completion)writeback){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffff88801feff140 ((wq_completion)writeback){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffff88801feff140 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3372 [inline]
 #0: ffff88801feff140 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3490
 #1: ffffc9000522fc40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #1: ffffc9000522fc40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #1: ffffc9000522fc40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3372 [inline]
 #1: ffffc9000522fc40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x97a/0x1630 kernel/workqueue.c:3490
 #2: ffff8880341c40e8 (&type->s_umount_key#34){++++}-{4:4}, at: super_trylock_shared+0x23/0xf0 fs/super.c:674
 #3: ffff8880341c2c98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: ext4_writepages+0x1f1/0x4e0 fs/ext4/inode.c:3031
 #4: ffff8880341c0938 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x1fb0/0x21f0 fs/jbd2/transaction.c:444
 #5: ffff888076498b28 (&ei->i_data_sem#2){++++}-{4:4}, at: ext4_map_blocks+0x77d/0x12c0 fs/ext4/inode.c:822
locks held by syz.2.33/6004: 2, on CPU#1:
 #0: ffff88807f61ca88 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x1d1/0x500 mm/mmap_lock.c:309
 #1: ffff8880341c4558 (sb_pagefaults){.+.+}-{0:0}, at: sb_start_pagefault include/linux/fs/super.h:159 [inline]
 #1: ffff8880341c4558 (sb_pagefaults){.+.+}-{0:0}, at: ext4_page_mkwrite+0x1fd/0x12c0 fs/ext4/inode.c:6901

=============================================

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 34 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:123
 nmi_trigger_cpumask_backtrace+0x17d/0x390 lib/nmi_backtrace.c:66
 trigger_all_cpu_backtrace include/linux/nmi.h:164 [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:377 [inline]
 watchdog+0x1058/0x10d0 kernel/hung_task.c:598
 kthread+0x38b/0x480 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
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:64
Code: 3c 8c 02 c3 cc cc cc cc cc cc cc 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 13 a1 20 00 fb f4 <e9> 4c 10 03 00 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffc900001c7e40 EFLAGS: 00000246
RAX: 0000000000237da5 RBX: ffffffff819c0490 RCX: 8000000000000001
RDX: 0000000000000001 RSI: ffffffff8e47d8da RDI: ffffffff8c6dc080
RBP: ffffc900001c7f10 R08: ffff8880b8733a1b R09: 1ffff110170e6743
R10: dffffc0000000000 R11: ffffed10170e6744 R12: 0000000000000000
R13: 1ffff11003cd53e8 R14: 1ffff92000038fd0 R15: dffffc0000000000
FS:  0000000000000000(0000) GS:ffff888124db7000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005625c09ad660 CR3: 000000000eb48000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/kernel/process.c:767 [inline]
 default_idle+0x9/0x20 arch/x86/kernel/process.c:768
 default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:199 [inline]
 do_idle+0x2e0/0x540 kernel/sched/idle.c:355
 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:454
 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312
 common_startup_64+0x13e/0x157
 </TASK>