INFO: task syz-executor:5854 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:22104 pid:5854 tgid:5854 ppid:5853 task_flags:0x440100 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:7058
io_schedule+0xbf/0x130 kernel/sched/core.c:7903
bit_wait_io+0x15/0xe0 kernel/sched/wait_bit.c:250
__wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0xd9/0x110 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
do_get_write_access+0x93d/0x1320 fs/jbd2/transaction.c:1092
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1241
__ext4_journal_get_write_access+0x6a/0x340 fs/ext4/ext4_jbd2.c:242
ext4_reserve_inode_write+0x1be/0x340 fs/ext4/inode.c:6326
__ext4_mark_inode_dirty+0x197/0x870 fs/ext4/inode.c:6501
ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:6538
__mark_inode_dirty+0x1ee/0xe40 fs/fs-writeback.c:2527
generic_update_time+0xcf/0xf0 fs/inode.c:2063
inode_update_time fs/inode.c:2076 [inline]
__file_update_time fs/inode.c:2304 [inline]
file_update_time+0x17d/0x1c0 fs/inode.c:2334
ext4_page_mkwrite+0x33d/0x1880 fs/ext4/inode.c:6704
do_page_mkwrite+0x171/0x380 mm/memory.c:3361
wp_page_shared mm/memory.c:3762 [inline]
do_wp_page+0xb10/0x4f00 mm/memory.c:3981
handle_pte_fault mm/memory.c:6068 [inline]
__handle_mm_fault+0x1b2d/0x2a50 mm/memory.c:6195
handle_mm_fault+0x589/0xd10 mm/memory.c:6364
do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336
handle_page_fault arch/x86/mm/fault.c:1476 [inline]
exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f84844781ff
RSP: 002b:00007ffc2bff1090 EFLAGS: 00010202
RAX: 00007f8482c88000 RBX: 0000555585f13860 RCX: 0000000000000003
RDX: 1ffffffff047125b RSI: 0000555585f1f908 RDI: 0000000000000008
RBP: 00007ffc2bff1380 R08: 0000555585f1f908 R09: 000000000000224b
R10: 0000000000000001 R11: 00007ffc2bff1590 R12: 00007ffc2bff13e0
R13: 0000000000000004 R14: 00007ffc2bff1100 R15: 00007ffc2bff11d0
INFO: task kworker/u8:42:20084 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:kworker/u8:42 state:D stack:24408 pid:20084 tgid:20084 ppid:2 task_flags:0x4248060 flags:0x00004000
Workqueue: writeback wb_workfn (flush-8:0)
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:7058
io_schedule+0xbf/0x130 kernel/sched/core.c:7903
rq_qos_wait+0x22f/0x340 block/blk-rq-qos.c:307
__wbt_wait block/blk-wbt.c:596 [inline]
wbt_wait+0x1af/0x390 block/blk-wbt.c:656
__rq_qos_throttle+0x56/0xa0 block/blk-rq-qos.c:66
rq_qos_throttle block/blk-rq-qos.h:168 [inline]
rq_qos_throttle block/blk-rq-qos.h:163 [inline]
blk_mq_get_new_requests block/blk-mq.c:3033 [inline]
blk_mq_submit_bio+0x2174/0x2a10 block/blk-mq.c:3183
__submit_bio+0x3cf/0x690 block/blk-core.c:637
__submit_bio_noacct_mq block/blk-core.c:724 [inline]
submit_bio_noacct_nocheck+0x660/0xd30 block/blk-core.c:753
submit_bio_noacct+0xb49/0x1ed0 block/blk-core.c:876
ext4_io_submit fs/ext4/page-io.c:404 [inline]
io_submit_add_bh fs/ext4/page-io.c:445 [inline]
ext4_bio_write_folio+0x756/0x1dc0 fs/ext4/page-io.c:589
mpage_process_page_bufs+0x47c/0x8d0 fs/ext4/inode.c:2191
mpage_prepare_extent_to_map+0x79f/0x14d0 fs/ext4/inode.c:2736
ext4_do_writepages+0xa11/0x3cf0 fs/ext4/inode.c:2877
ext4_writepages+0x37a/0x7d0 fs/ext4/inode.c:3025
do_writepages+0x27a/0x600 mm/page-writeback.c:2634
__writeback_single_inode+0x160/0xfb0 fs/fs-writeback.c:1680
writeback_sb_inodes+0x60d/0xfa0 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:3236
process_scheduled_works kernel/workqueue.c:3319 [inline]
worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
kthread+0x3c2/0x780 kernel/kthread.c:463
ret_from_fork+0x56d/0x730 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
INFO: task syz-executor:14788 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor state:D stack:23304 pid:14788 tgid:14788 ppid:14733 task_flags:0x440140 flags:0x00004000
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:7058
io_schedule+0xbf/0x130 kernel/sched/core.c:7903
bit_wait_io+0x15/0xe0 kernel/sched/wait_bit.c:250
__wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0xd9/0x110 kernel/sched/wait_bit.c:67
wait_on_bit_io include/linux/wait_bit.h:105 [inline]
do_get_write_access+0x93d/0x1320 fs/jbd2/transaction.c:1092
jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1241
__ext4_journal_get_write_access+0x6a/0x340 fs/ext4/ext4_jbd2.c:242
__ext4_new_inode+0x17db/0x4f00 fs/ext4/ialloc.c:1132
ext4_mkdir+0x283/0xb80 fs/ext4/namei.c:3007
vfs_mkdir+0x590/0x8c0 fs/namei.c:4366
do_mkdirat+0x304/0x3e0 fs/namei.c:4399
__do_sys_mkdirat fs/namei.c:4416 [inline]
__se_sys_mkdirat fs/namei.c:4414 [inline]
__x64_sys_mkdirat+0x83/0xb0 fs/namei.c:4414
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f940e98d617
RSP: 002b:00007ffc74373878 EFLAGS: 00000202 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007f940ea123a5 RCX: 00007f940e98d617
RDX: 00000000000001ff RSI: 00007f940ea123a5 RDI: 00000000ffffff9c
RBP: 00007f940ebe67b8 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000008
R13: 0000000000000003 R14: 0000000000000009 R15: 0000000000000000
INFO: task syz.7.6439:15036 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.7.6439 state:D stack:27672 pid:15036 tgid:15011 ppid:10063 task_flags:0x400040 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:7058
io_schedule+0xbf/0x130 kernel/sched/core.c:7903
folio_wait_bit_common+0x3d6/0x9e0 mm/filemap.c:1317
folio_wait_writeback+0x3c/0x90 mm/page-writeback.c:3124
__filemap_fdatawait_range+0x11f/0x200 mm/filemap.c:539
file_write_and_wait_range+0x101/0x140 mm/filemap.c:798
ext4_sync_file+0x310/0xf10 fs/ext4/fsync.c:154
vfs_fsync_range+0x139/0x220 fs/sync.c:187
__do_sys_msync+0x3cb/0x5c0 mm/msync.c:96
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f536698eec9
RSP: 002b:00007f536777a038 EFLAGS: 00000246 ORIG_RAX: 000000000000001a
RAX: ffffffffffffffda RBX: 00007f5366be6360 RCX: 00007f536698eec9
RDX: 0000000400000004 RSI: 01800000ff000000 RDI: 000000001ffff000
RBP: 00007f5366a11f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f5366be63f8 R14: 00007f5366be6360 R15: 00007ffc519a7a88
INFO: task dhcpcd:15027 blocked for more than 144 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:dhcpcd state:D stack:25976 pid:15027 tgid:15027 ppid:5531 task_flags:0x400040 flags:0x00004002
Call Trace:
context_switch kernel/sched/core.c:5357 [inline]
__schedule+0x1190/0x5de0 kernel/sched/core.c:6961
__schedule_loop kernel/sched/core.c:7043 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:7058
io_schedule+0xbf/0x130 kernel/sched/core.c:7903
bit_wait_io+0x15/0xe0 kernel/sched/wait_bit.c:250
__wait_on_bit+0x65/0x180 kernel/sched/wait_bit.c:52
out_of_line_wait_on_bit+0xd9/0x110 kernel/sched/wait_bit.c:67
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:420 [inline]
__ext4_get_inode_loc+0x1085/0x1540 fs/ext4/inode.c:4961
ext4_get_inode_loc+0xbd/0x160 fs/ext4/inode.c:4994
ext4_xattr_ibody_get+0x106/0x4b0 fs/ext4/xattr.c:644
ext4_xattr_get+0x165/0x780 fs/ext4/xattr.c:705
__vfs_getxattr+0x13a/0x1a0 fs/xattr.c:423
get_vfs_caps_from_disk+0x140/0x550 security/commoncap.c:684
get_file_caps security/commoncap.c:775 [inline]
cap_bprm_creds_from_file+0x66b/0x1cd0 security/commoncap.c:921
security_bprm_creds_from_file+0x1e3/0x210 security/security.c:1285
bprm_creds_from_file fs/exec.c:1595 [inline]
begin_new_exec+0x11c/0x38b0 fs/exec.c:1105
load_elf_binary+0x8e7/0x4fe0 fs/binfmt_elf.c:995
search_binary_handler fs/exec.c:1670 [inline]
exec_binprm fs/exec.c:1702 [inline]
bprm_execve fs/exec.c:1754 [inline]
bprm_execve+0x8bb/0x1640 fs/exec.c:1730
do_execveat_common.isra.0+0x4a5/0x610 fs/exec.c:1860
do_execve fs/exec.c:1934 [inline]
__do_sys_execve fs/exec.c:2010 [inline]
__se_sys_execve fs/exec.c:2005 [inline]
__x64_sys_execve+0x8e/0xb0 fs/exec.c:2005
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f352c05b107
RSP: 002b:00007f352bec4e68 EFLAGS: 00000202 ORIG_RAX: 000000000000003b
RAX: ffffffffffffffda RBX: 00007ffe3dd39010 RCX: 00007f352c05b107
RDX: 000055613a510ae0 RSI: 00007ffe3dd39200 RDI: 000055612c4276bd
RBP: 00007f352bec4ff0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000008 R11: 0000000000000202 R12: 0000000000000001
R13: 00007ffe3dd38cf0 R14: 00007f352bec4f20 R15: 0000000000000040
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e5c1520 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e5c1520 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e5c1520 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6775
3 locks held by syz-executor/5854:
#0: ffff8880750141c8 (vm_lock){++++}-{0:0}, at: lock_vma_under_rcu+0x11b/0x530 mm/mmap_lock.c:147
#1: ffff888034f7a520 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x171/0x380 mm/memory.c:3361
#2: ffff888034f7e950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x5e4/0x1410 fs/jbd2/transaction.c:444
4 locks held by kworker/u8:42/20084:
#0: ffff888140aad148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3211
#1: ffffc90003d4fd10 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3212
#2: ffff888034f7a0e0 (&type->s_umount_key#31){++++}-{4:4}, at: super_trylock_shared+0x1e/0xf0 fs/super.c:563
#3: ffff888034f7cb98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: do_writepages+0x27a/0x600 mm/page-writeback.c:2634
2 locks held by getty/25529:
#0: ffff888034b0e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc900032242f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41b/0x14f0 drivers/tty/n_tty.c:2222
3 locks held by syz-executor/14788:
#0: ffff888034f7a428 (sb_writers#4){.+.+}-{0:0}, at: filename_create+0x10e/0x4a0 fs/namei.c:4132
#1: ffff88805bd46380 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:915 [inline]
#1: ffff88805bd46380 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: filename_create+0x1bb/0x4a0 fs/namei.c:4139
#2: ffff888034f7e950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x5e4/0x1410 fs/jbd2/transaction.c:444
2 locks held by dhcpcd/15027:
#0: ffff8880317ddd08 (&sig->cred_guard_mutex){+.+.}-{4:4}, at: prepare_bprm_creds fs/exec.c:1361 [inline]
#0: ffff8880317ddd08 (&sig->cred_guard_mutex){+.+.}-{4:4}, at: bprm_execve+0xa4/0x1640 fs/exec.c:1734
#1: ffff888033153098 (&ei->xattr_sem){.+.+}-{4:4}, at: ext4_xattr_get+0x14d/0x780 fs/ext4/xattr.c:704
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
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:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:328 [inline]
watchdog+0xf0e/0x1260 kernel/hung_task.c:491
kthread+0x3c2/0x780 kernel/kthread.c:463
ret_from_fork+0x56d/0x730 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245