INFO: task syz.1.419:9892 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.419 state:D stack:24120 pid:9892 tgid:9891 ppid:8231 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x14de/0x5210 kernel/sched/core.c:6907
__schedule_loop kernel/sched/core.c:6989 [inline]
rt_mutex_schedule+0x76/0xf0 kernel/sched/core.c:7285
rt_mutex_slowlock_block kernel/locking/rtmutex.c:1647 [inline]
__rt_mutex_slowlock kernel/locking/rtmutex.c:1721 [inline]
__rt_mutex_slowlock_locked+0x1f8f/0x25c0 kernel/locking/rtmutex.c:1760
rt_mutex_slowlock+0xbd/0x170 kernel/locking/rtmutex.c:1800
__rt_mutex_lock kernel/locking/rtmutex.c:1815 [inline]
rwbase_write_lock+0x14d/0x730 kernel/locking/rwbase_rt.c:244
inode_lock include/linux/fs.h:1028 [inline]
generic_file_write_iter+0x11f/0x690 mm/filemap.c:4454
iter_file_splice_write+0x9a0/0x1100 fs/splice.c:738
do_splice_from fs/splice.c:938 [inline]
direct_splice_actor+0x104/0x160 fs/splice.c:1161
splice_direct_to_actor+0x545/0xc80 fs/splice.c:1105
do_splice_direct_actor fs/splice.c:1204 [inline]
do_splice_direct+0x19b/0x2a0 fs/splice.c:1230
do_sendfile+0x547/0x7e0 fs/read_write.c:1372
__do_sys_sendfile64 fs/read_write.c:1433 [inline]
__se_sys_sendfile64+0x144/0x1a0 fs/read_write.c:1419
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f12700fbf79
RSP: 002b:00007f126e356028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f1270375fa0 RCX: 00007f12700fbf79
RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000005
RBP: 00007f12701927e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020fffe82 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1270376038 R14: 00007f1270375fa0 R15: 00007ffef1914ce8
INFO: task syz.1.419:9893 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.419 state:D stack:24328 pid:9893 tgid:9891 ppid:8231 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5295 [inline]
__schedule+0x14de/0x5210 kernel/sched/core.c:6907
__schedule_loop kernel/sched/core.c:6989 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7004
io_schedule+0x80/0xe0 kernel/sched/core.c:7831
folio_wait_bit_common+0x6dd/0xbc0 mm/filemap.c:1323
folio_lock include/linux/pagemap.h:1170 [inline]
release_metapage+0x103/0xab0 fs/jfs/jfs_metapage.c:870
discard_metapage fs/jfs/jfs_metapage.h:88 [inline]
__get_metapage+0x9a3/0xde0 fs/jfs/jfs_metapage.c:753
xt_getpage fs/jfs/jfs_xtree.c:116 [inline]
xtSearch+0x154/0x1cf0 fs/jfs/jfs_xtree.c:270
xtLookup+0x295/0x860 fs/jfs/jfs_xtree.c:168
jfs_get_block+0x25b/0xad0 fs/jfs/inode.c:224
get_more_blocks fs/direct-io.c:648 [inline]
do_direct_IO fs/direct-io.c:936 [inline]
__blockdev_direct_IO+0x1671/0x3330 fs/direct-io.c:1243
blockdev_direct_IO include/linux/fs.h:3104 [inline]
jfs_direct_IO+0x11b/0x220 fs/jfs/inode.c:339
generic_file_direct_write+0x1dc/0x3e0 mm/filemap.c:4248
__generic_file_write_iter+0x120/0x240 mm/filemap.c:4417
generic_file_write_iter+0x14b/0x690 mm/filemap.c:4457
iter_file_splice_write+0x9a0/0x1100 fs/splice.c:738
do_splice_from fs/splice.c:938 [inline]
direct_splice_actor+0x104/0x160 fs/splice.c:1161
splice_direct_to_actor+0x545/0xc80 fs/splice.c:1105
do_splice_direct_actor fs/splice.c:1204 [inline]
do_splice_direct+0x19b/0x2a0 fs/splice.c:1230
do_sendfile+0x547/0x7e0 fs/read_write.c:1372
__do_sys_sendfile64 fs/read_write.c:1433 [inline]
__se_sys_sendfile64+0x144/0x1a0 fs/read_write.c:1419
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f12700fbf79
RSP: 002b:00007f126e335028 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f1270376090 RCX: 00007f12700fbf79
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 0000000000000008
RBP: 00007f12701927e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000020fffe82 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1270376128 R14: 00007f1270376090 R15: 00007ffef1914ce8
Showing all locks held in the system:
3 locks held by kworker/u8:0/12:
1 lock held by khungtaskd/37:
#0: ffffffff8dbcd480 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#0: ffffffff8dbcd480 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#0: ffffffff8dbcd480 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
5 locks held by kworker/u8:5/1101:
#0: ffff88801b28c138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3250 [inline]
#0: ffff88801b28c138 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0 kernel/workqueue.c:3358
#1: ffffc9000461fc40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3251 [inline]
#1: ffffc9000461fc40 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0 kernel/workqueue.c:3358
#2: ffff8880441020d0 (&type->s_umount_key#93){++++}-{4:4}, at: super_trylock_shared+0x20/0xf0 fs/super.c:565
#3: ffff888060c281e8 (&jfs_ip->commit_mutex){+.+.}-{4:4}, at: jfs_commit_inode+0x1ca/0x530 fs/jfs/inode.c:108
#4: ffff88803bb8a150 (&(log)->loglock){+.+.}-{4:4}, at: lmLog+0x78/0xa30 fs/jfs/jfs_logmgr.c:236
8 locks held by kworker/u8:8/1363:
2 locks held by getty/5548:
#0: ffff888036d170a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000421e2e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x462/0x13c0 drivers/tty/n_tty.c:2211
2 locks held by syz.1.419/9892:
#0: ffff888044102480 (sb_writers#32){.+.+}-{0:0}, at: direct_splice_actor+0x49/0x160 fs/splice.c:1160
#1: ffff888060c285b8 (&sb->s_type->i_mutex_key#42){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline]
#1: ffff888060c285b8 (&sb->s_type->i_mutex_key#42){+.+.}-{4:4}, at: generic_file_write_iter+0x11f/0x690 mm/filemap.c:4454
3 locks held by syz.1.419/9893:
#0: ffff888044102480 (sb_writers#32){.+.+}-{0:0}, at: direct_splice_actor+0x49/0x160 fs/splice.c:1160
#1: ffff888060c285b8 (&sb->s_type->i_mutex_key#42){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline]
#1: ffff888060c285b8 (&sb->s_type->i_mutex_key#42){+.+.}-{4:4}, at: generic_file_write_iter+0x11f/0x690 mm/filemap.c:4454
#2: ffff888060c28168 (&jfs_ip->rdwrlock#3){++++}-{4:4}, at: jfs_get_block+0x164/0xad0 fs/jfs/inode.c:221
2 locks held by syz.4.429/10069:
#0: ffff8880441020d0 (&type->s_umount_key#93){++++}-{4:4}, at: __super_lock fs/super.c:60 [inline]
#0: ffff8880441020d0 (&type->s_umount_key#93){++++}-{4:4}, at: super_lock+0x2d6/0x3d0 fs/super.c:122
#1: ffff88803bb8a150 (&(log)->loglock){+.+.}-{4:4}, at: jfs_syncpt+0x25/0x90 fs/jfs/jfs_logmgr.c:1039
2 locks held by kworker/u8:13/10750:
#0: ffff88813fe74138 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3250 [inline]
#0: ffff88813fe74138 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17a0 kernel/workqueue.c:3358
#1: ffffc9000570fc40 (connector_reaper_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3251 [inline]
#1: ffffc9000570fc40 (connector_reaper_work){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17a0 kernel/workqueue.c:3358
2 locks held by syz-executor/10815:
#0: ffff88804eb6e0d0 (&type->s_umount_key#61){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff88804eb6e0d0 (&type->s_umount_key#61){++++}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff88804eb6e0d0 (&type->s_umount_key#61){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
#1: ffff88804eb6eb08 (&s->s_sync_lock){+.+.}-{4:4}, at: wait_sb_inodes fs/fs-writeback.c:2739 [inline]
#1: ffff88804eb6eb08 (&s->s_sync_lock){+.+.}-{4:4}, at: sync_inodes_sb+0x288/0xc10 fs/fs-writeback.c:2927
2 locks held by syz-executor/10869:
2 locks held by udevd/11144:
2 locks held by syz.7.566/11387:
2 locks held by udevadm/11418:
1 lock held by rm/11426:
2 locks held by syz.1.569/11428:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:161 [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:346 [inline]
watchdog+0xf90/0xfe0 kernel/hung_task.c:515
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 18 Comm: rcu_preempt Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:check_wait_context kernel/locking/lockdep.c:-1 [inline]
RIP: 0010:__lock_acquire+0x3b3/0x2cf0 kernel/locking/lockdep.c:5187
Code: 85 c0 74 1c 83 3d 70 27 aa 0d 00 75 13 48 8d 3d e3 2e ad 0d 48 c7 c6 e9 94 45 8d 67 48 0f b9 3a 90 31 c0 0f b6 98 c4 00 00 00 <41> 8b 45 20 25 ff 1f 00 00 48 0f a3 05 8c 60 91 11 73 17 48 69 c0
RSP: 0018:ffffc90000177ab8 EFLAGS: 00000002
RAX: ffffffff92d1c748 RBX: 0000000000000002 RCX: 000000000000006b
RDX: 0000000000080000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffffff81a99159 R09: ffffffff8dbd2f98
R10: dffffc0000000000 R11: fffffbfff1e9250f R12: 000000000000006b
R13: ffff88801ce94768 R14: ffff88801ce93c00 R15: ffff88801ce94768
FS: 0000000000000000(0000) GS:ffff888126595000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f20e0db7dac CR3: 0000000034442000 CR4: 00000000003526f0
Call Trace:
lock_acquire+0x106/0x330 kernel/locking/lockdep.c:5868
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:142 [inline]
_raw_spin_lock_irq+0x3d/0x50 kernel/locking/spinlock.c:170
rcu_gp_cleanup+0x59/0xe60 kernel/rcu/tree.c:2162
rcu_gp_kthread+0xac/0x2b0 kernel/rcu/tree.c:2301
kthread+0x388/0x470 kernel/kthread.c:467
ret_from_fork+0x51e/0xb90 arch/x86/kernel/process.c:158
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245