INFO: task syz.6.1159:14704 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.1159 state:D stack:24768 pid:14704 tgid:14703 ppid:11507 task_flags:0x400140 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5298 [inline]
__schedule+0x1553/0x5240 kernel/sched/core.c:6911
__schedule_loop kernel/sched/core.c:6993 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7008
io_schedule+0x80/0xe0 kernel/sched/core.c:7835
__lock_metapage fs/jfs/jfs_metapage.c:52 [inline]
lock_metapage+0x1ff/0x400 fs/jfs/jfs_metapage.c:66
__get_metapage+0x49a/0xde0 fs/jfs/jfs_metapage.c:748
dtSearch+0x591/0x21b0 fs/jfs/jfs_dtree.c:624
jfs_lookup+0x1b0/0x420 fs/jfs/namei.c:1464
__lookup_slow+0x2d2/0x440 fs/namei.c:1916
lookup_slow+0x53/0x70 fs/namei.c:1933
walk_component fs/namei.c:2279 [inline]
lookup_last fs/namei.c:2786 [inline]
path_lookupat+0x3f5/0x8c0 fs/namei.c:2810
filename_lookup+0x256/0x5d0 fs/namei.c:2839
__do_sys_chdir fs/open.c:559 [inline]
__se_sys_chdir+0xa8/0x2a0 fs/open.c:552
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: 0033:0x7f170295c819
RSP: 002b:00007f1700bb6028 EFLAGS: 00000246 ORIG_RAX: 0000000000000050
RAX: ffffffffffffffda RBX: 00007f1702bd5fa0 RCX: 00007f170295c819
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000200000000140
RBP: 00007f17029f2c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1702bd6038 R14: 00007f1702bd5fa0 R15: 00007ffea3742108
INFO: task syz.6.1159:14755 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.1159 state:D stack:26440 pid:14755 tgid:14703 ppid:11507 task_flags:0x400040 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5298 [inline]
__schedule+0x1553/0x5240 kernel/sched/core.c:6911
__schedule_loop kernel/sched/core.c:6993 [inline]
rt_mutex_schedule+0x76/0xf0 kernel/sched/core.c:7289
rwbase_write_lock+0x3da/0x730 kernel/locking/rwbase_rt.c:272
inode_lock include/linux/fs.h:1028 [inline]
open_last_lookups fs/namei.c:4586 [inline]
path_openat+0xb5e/0x38a0 fs/namei.c:4833
do_file_open+0x23e/0x4a0 fs/namei.c:4865
do_sys_openat2+0x113/0x200 fs/open.c:1366
do_sys_open fs/open.c:1372 [inline]
__do_sys_openat fs/open.c:1388 [inline]
__se_sys_openat fs/open.c:1383 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1383
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: 0033:0x7f170295c819
RSP: 002b:00007f1700b74028 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f1702bd6180 RCX: 00007f170295c819
RDX: 000000000000275a RSI: 00002000000000c0 RDI: ffffffffffffff9c
RBP: 00007f17029f2c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f1702bd6218 R14: 00007f1702bd6180 R15: 00007ffea3742108
Showing all locks held in the system:
1 lock held by khungtaskd/38:
#0: ffffffff8ddcb980 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
#0: ffffffff8ddcb980 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline]
#0: ffffffff8ddcb980 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5551:
#0: ffff888028ecd0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90003e8b2e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x462/0x13c0 drivers/tty/n_tty.c:2211
1 lock held by syz.6.1159/14704:
#0: ffff88805e378f78 (&type->i_mutex_dir_key#16){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:1043 [inline]
#0: ffff88805e378f78 (&type->i_mutex_dir_key#16){++++}-{4:4}, at: lookup_slow+0x46/0x70 fs/namei.c:1932
2 locks held by syz.6.1159/14755:
#0: ffff88805bc62480 (sb_writers#25){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:493
#1: ffff88805e378f78 (&type->i_mutex_dir_key#16){++++}-{4:4}, at: inode_lock include/linux/fs.h:1028 [inline]
#1: ffff88805e378f78 (&type->i_mutex_dir_key#16){++++}-{4:4}, at: open_last_lookups fs/namei.c:4586 [inline]
#1: ffff88805e378f78 (&type->i_mutex_dir_key#16){++++}-{4:4}, at: path_openat+0xb5e/0x38a0 fs/namei.c:4833
1 lock held by syz-executor/14855:
#0: ffff888039a360d0 (&type->s_umount_key#71){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline]
#0: ffff888039a360d0 (&type->s_umount_key#71){++++}-{4:4}, at: __super_lock_excl fs/super.c:73 [inline]
#0: ffff888039a360d0 (&type->s_umount_key#71){++++}-{4:4}, at: deactivate_super+0xa9/0xe0 fs/super.c:508
2 locks held by syz.8.1373/16592:
2 locks held by syz.3.1374/16602:
3 locks held by syz.9.1376/16607:
1 lock held by dhcpcd-run-hook/16609:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 38 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
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+0xfd9/0x1030 kernel/hung_task.c:515
kthread+0x388/0x470 kernel/kthread.c:436
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 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 16607 Comm: syz.9.1376 Not tainted syzkaller #0 PREEMPT_{RT,(full)}
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4896 [inline]
RIP: 0010:__lock_acquire+0x584/0x2cf0 kernel/locking/lockdep.c:5187
Code: c7 c6 2c 9f 67 8d 67 48 0f b9 3a 90 31 c9 0f b6 81 c4 00 00 00 84 c0 0f 84 77 ff ff ff 41 0f b6 f4 0f b6 d0 40 38 c6 0f 42 d6 <80> b9 c6 00 00 00 02 0f 84 60 ff ff ff 89 d0 e9 59 ff ff ff 48 c7
RSP: 0018:ffffc9000634f6f0 EFLAGS: 00000002
RAX: 0000000000000004 RBX: ffff88801ff82a80 RCX: ffffffff92fe12d0
RDX: 0000000000000004 RSI: 0000000000000005 RDI: 0000000000000000
RBP: ffff88801ff82a88 R08: ffffffff822f6729 R09: ffffffff8ddcb980
R10: dffffc0000000000 R11: fffffbfff1ed4e77 R12: 00000000ffffff05
R13: ffff88801ff82a88 R14: ffff88801ff81e80 R15: 0000000000000001
FS: 00007f912f08e6c0(0000) GS:ffff888126432000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fadab4c3000 CR3: 0000000043fe4000 CR4: 00000000003526f0
Call Trace:
lock_acquire+0xf0/0x2e0 kernel/locking/lockdep.c:5868
rcu_lock_acquire include/linux/rcupdate.h:312 [inline]
rcu_read_lock include/linux/rcupdate.h:850 [inline]
percpu_ref_put_many include/linux/percpu-refcount.h:330 [inline]
percpu_ref_put+0x35/0x180 include/linux/percpu-refcount.h:351
css_put include/linux/cgroup_refcnt.h:79 [inline]
__mem_cgroup_charge+0x149/0x1e0 mm/memcontrol.c:4762
mem_cgroup_charge include/linux/memcontrol.h:664 [inline]
shmem_alloc_and_add_folio mm/shmem.c:1982 [inline]
shmem_get_folio_gfp+0x75f/0x1a80 mm/shmem.c:2567
shmem_get_folio mm/shmem.c:2673 [inline]
shmem_write_begin+0x166/0x320 mm/shmem.c:3327
generic_perform_write+0x2af/0x8b0 mm/filemap.c:4319
shmem_file_write_iter+0xfb/0x120 mm/shmem.c:3502
new_sync_write fs/read_write.c:595 [inline]
vfs_write+0x629/0xba0 fs/read_write.c:688
ksys_write+0x156/0x270 fs/read_write.c:740
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: 0033:0x7f9130dfd04e
Code: 08 0f 85 a5 a8 ff ff 49 89 fb 48 89 f0 48 89 d7 48 89 ce 4c 89 c2 4d 89 ca 4c 8b 44 24 08 4c 8b 4c 24 10 4c 89 5c 24 08 0f 05 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 80 00 00 00 00 48 83 ec 08
RSP: 002b:00007f912f08dda8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f912f08e6c0 RCX: 00007f9130dfd04e
RDX: 0000000001000000 RSI: 00007f9126c6e000 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000003
R13: 00007f912f08dee0 R14: 00007f912f08dea0 R15: 00007f9126c6e000