INFO: task kworker/u8:1:13 blocked for more than 122 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:1 state:D stack:0 pid:13 tgid:13 ppid:2 flags:0x00004000
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
context_switch kernel/sched/core.c:6060 [inline]
__schedule+0x1496/0x20b0 kernel/sched/core.c:7880
__schedule_loop kernel/sched/core.c:7957 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7972
io_schedule+0x88/0xe0 kernel/sched/core.c:8786
bit_wait_io+0x17/0xd0 kernel/sched/wait_bit.c:209
__wait_on_bit_lock+0x241/0x5e0 kernel/sched/wait_bit.c:90
out_of_line_wait_on_bit_lock+0x139/0x190 kernel/sched/wait_bit.c:117
wait_on_bit_lock_io include/linux/wait_bit.h:208 [inline]
__lock_buffer+0x5d/0x70 fs/buffer.c:71
lock_buffer include/linux/buffer_head.h:434 [inline]
do_get_write_access+0x196/0xd70 fs/jbd2/transaction.c:972
jbd2_journal_get_write_access+0x268/0x3d0 fs/jbd2/transaction.c:1245
__ext4_journal_get_write_access+0x1b6/0x6a0 fs/ext4/ext4_jbd2.c:239
ext4_mb_mark_context+0x1f3/0xee0 fs/ext4/mballoc.c:4094
ext4_mb_mark_diskspace_used+0x3aa/0x830 fs/ext4/mballoc.c:4223
ext4_mb_new_blocks+0x840/0x36c0 fs/ext4/mballoc.c:6318
ext4_ext_map_blocks+0x14d9/0x6080 fs/ext4/extents.c:4437
ext4_map_create_blocks fs/ext4/inode.c:520 [inline]
ext4_map_blocks+0x873/0x17f0 fs/ext4/inode.c:706
mpage_map_one_extent fs/ext4/inode.c:2222 [inline]
mpage_map_and_submit_extent fs/ext4/inode.c:2275 [inline]
ext4_do_writepages+0x1c4a/0x39f0 fs/ext4/inode.c:2738
ext4_writepages+0x28c/0x550 fs/ext4/inode.c:2827
do_writepages+0x3d4/0x7f0 mm/page-writeback.c:2689
__writeback_single_inode+0xc8/0xba0 fs/fs-writeback.c:1674
writeback_sb_inodes+0x6a5/0xfb0 fs/fs-writeback.c:1970
__writeback_inodes_wb+0x129/0x280 fs/fs-writeback.c:2041
wb_writeback+0x3bb/0x850 fs/fs-writeback.c:2152
wb_check_background_flush fs/fs-writeback.c:2222 [inline]
wb_do_writeback fs/fs-writeback.c:2310 [inline]
wb_workfn+0xab0/0xef0 fs/fs-writeback.c:2337
process_one_work kernel/workqueue.c:3273 [inline]
process_scheduled_works+0x7f7/0x1060 kernel/workqueue.c:3354
worker_thread+0xc99/0x13f0 kernel/workqueue.c:3435
kthread+0x2c7/0x360 kernel/kthread.c:389
ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
INFO: task jbd2/sda1-8:73 blocked for more than 123 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:jbd2/sda1-8 state:D stack:0 pid:73 tgid:73 ppid:2 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:6060 [inline]
__schedule+0x1496/0x20b0 kernel/sched/core.c:7880
__schedule_loop kernel/sched/core.c:7957 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7972
jbd2_journal_wait_updates+0x198/0x280 fs/jbd2/transaction.c:847
jbd2_journal_commit_transaction+0x813/0x5510 fs/jbd2/commit.c:454
kjournald2+0x386/0x6a0 fs/jbd2/journal.c:201
kthread+0x2c7/0x360 kernel/kthread.c:389
ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
INFO: task syz-executor:286 blocked for more than 123 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:0 pid:286 tgid:286 ppid:285 flags:0x00000000
Call Trace:
context_switch kernel/sched/core.c:6060 [inline]
__schedule+0x1496/0x20b0 kernel/sched/core.c:7880
__schedule_loop kernel/sched/core.c:7957 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7972
wait_transaction_locked+0x19e/0x240 fs/jbd2/transaction.c:156
add_transaction_credits fs/jbd2/transaction.c:226 [inline]
start_this_handle+0x7de/0x2050 fs/jbd2/transaction.c:407
jbd2__journal_start+0x300/0x860 fs/jbd2/transaction.c:505
__ext4_journal_start_sb+0x111/0x3f0 fs/ext4/ext4_jbd2.c:112
__ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline]
ext4_dirty_inode+0x97/0x110 fs/ext4/inode.c:6100
__mark_inode_dirty+0x251/0xc50 fs/fs-writeback.c:2515
generic_update_time fs/inode.c:2056 [inline]
inode_update_time fs/inode.c:2069 [inline]
__file_update_time fs/inode.c:2258 [inline]
file_update_time+0x1d3/0x210 fs/inode.c:2288
ext4_page_mkwrite+0x2bf/0x1120 fs/ext4/inode.c:6221
do_page_mkwrite mm/memory.c:3263 [inline]
do_shared_fault mm/memory.c:5537 [inline]
do_fault mm/memory.c:5599 [inline]
do_pte_missing+0x12c4/0x4440 mm/memory.c:4069
handle_pte_fault mm/memory.c:5940 [inline]
__handle_mm_fault mm/memory.c:6083 [inline]
handle_mm_fault+0x1189/0x1ba0 mm/memory.c:6251
do_user_addr_fault+0x951/0x1230 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1479 [inline]
exc_page_fault+0x58/0xc0 arch/x86/mm/fault.c:1534
asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f9ba4f6d207
RSP: 002b:00007ffd02549c68 EFLAGS: 00010206
RAX: 00007f9ba2a00000 RBX: 0000555582097a80 RCX: 000000000000055a
RDX: 000000000000255a RSI: 00005555821086d0 RDI: 00007f9ba2a02000
RBP: 00007ffd02549c80 R08: 00007f9ba2a00000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 000055558209b0a0
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
INFO: task syz.3.19:374 blocked for more than 124 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.19 state:D stack:0 pid:374 tgid:374 ppid:298 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:6060 [inline]
__schedule+0x1496/0x20b0 kernel/sched/core.c:7880
__schedule_loop kernel/sched/core.c:7957 [inline]
schedule+0xc5/0x240 kernel/sched/core.c:7972
wait_transaction_locked+0x19e/0x240 fs/jbd2/transaction.c:156
add_transaction_credits fs/jbd2/transaction.c:226 [inline]
start_this_handle+0x7de/0x2050 fs/jbd2/transaction.c:407
jbd2__journal_start+0x300/0x860 fs/jbd2/transaction.c:505
__ext4_journal_start_sb+0x111/0x3f0 fs/ext4/ext4_jbd2.c:112
__ext4_journal_start fs/ext4/ext4_jbd2.h:326 [inline]
ext4_dirty_inode+0x97/0x110 fs/ext4/inode.c:6100
__mark_inode_dirty+0x251/0xc50 fs/fs-writeback.c:2515
generic_update_time fs/inode.c:2056 [inline]
inode_update_time fs/inode.c:2069 [inline]
__file_update_time fs/inode.c:2258 [inline]
file_update_time+0x1d3/0x210 fs/inode.c:2288
ext4_page_mkwrite+0x2bf/0x1120 fs/ext4/inode.c:6221
do_page_mkwrite mm/memory.c:3263 [inline]
do_shared_fault mm/memory.c:5537 [inline]
do_fault mm/memory.c:5599 [inline]
do_pte_missing+0x12c4/0x4440 mm/memory.c:4069
handle_pte_fault mm/memory.c:5940 [inline]
__handle_mm_fault mm/memory.c:6083 [inline]
handle_mm_fault+0x1189/0x1ba0 mm/memory.c:6251
do_user_addr_fault+0x951/0x1230 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1479 [inline]
exc_page_fault+0x58/0xc0 arch/x86/mm/fault.c:1534
asm_exc_page_fault+0x2b/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7fe23b672729
RSP: 002b:00007ffdb519ab90 EFLAGS: 00010202
RAX: 0000001b2f422000 RBX: ffffffff827357ff RCX: 0000001b2f421ff8
RDX: 0000001b2f024224 RSI: 0000000000000008 RDI: 00007fe23c555720
RBP: 0000000000000374 R08: 00007fe23ba10000 R09: 00007fe23ba12000
R10: 0000000082735803 R11: 00000000000000ff R12: 00007fe23ba25f40
R13: 0000000000008b98 R14: ffffffff827357ff R15: 00007fe23c555720
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 c4896d72d1fb51cdc6291d08376a37fd8080d7bb
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
__dump_stack+0x21/0x30 lib/dump_stack.c:94
dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120
dump_stack+0x19/0x20 lib/dump_stack.c:129
nmi_cpu_backtrace+0x2ba/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:62
arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline]
watchdog+0xe45/0xf90 kernel/hung_task.c:423
kthread+0x2c7/0x360 kernel/kthread.c:389
ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Not tainted syzkaller #0 c4896d72d1fb51cdc6291d08376a37fd8080d7bb
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:116
Code: cc cc cc cc cc cc cc b8 68 06 71 8f 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 23 19 43 00 55 48 89 e5 fb f4 <5d> c3 cc cc cc cc cc cc cc cc cc cc cc b8 00 00 00 00 90 90 90 90
RSP: 0018:ffffc900001a7e00 EFLAGS: 000002c2
RAX: ffff8881f6f00000 RBX: ffff88810366a600 RCX: ffffffff85a444fd
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 000000000004737c
RBP: ffffc900001a7e00 R08: ffff8881f6f395eb R09: 1ffff1103ede72bd
R10: dffffc0000000000 R11: ffffed103ede72be R12: 0000000000000000
R13: 1ffff110206cd4c0 R14: dffffc0000000000 R15: ffffffff87ecbfe8
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f11def99492 CR3: 000000010cb5c000 CR4: 00000000003526b0
Call Trace:
arch_safe_halt arch/x86/include/asm/paravirt.h:-1 [inline]
default_idle+0x17/0x30 arch/x86/kernel/process.c:754
arch_cpu_idle+0xd/0x20 arch/x86/kernel/process.c:791
default_idle_call+0x3e/0x80 kernel/sched/idle.c:117
cpuidle_idle_call kernel/sched/idle.c:193 [inline]
do_idle+0x2fc/0x570 kernel/sched/idle.c:346
cpu_startup_entry+0x47/0x60 kernel/sched/idle.c:445
start_secondary+0x12e/0x140 arch/x86/kernel/smpboot.c:314
common_startup_64+0x13b/0x157