INFO: task syz.0.1147:16909 blocked for more than 143 seconds.
Not tainted 6.14.0-rc7-syzkaller-00179-gb3ee1e460951 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.1147 state:D stack:26384 pid:16909 tgid:16908 ppid:11162 task_flags:0x400140 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5378 [inline]
__schedule+0x18bc/0x4c40 kernel/sched/core.c:6765
__schedule_loop kernel/sched/core.c:6842 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6857
request_wait_answer fs/fuse/dev.c:453 [inline]
__fuse_request_send fs/fuse/dev.c:467 [inline]
__fuse_simple_request+0xe2a/0x1850 fs/fuse/dev.c:561
fuse_simple_request fs/fuse/fuse_i.h:1197 [inline]
fuse_send_open fs/fuse/file.c:51 [inline]
fuse_file_open+0x626/0xb20 fs/fuse/file.c:146
fuse_do_open+0x4f/0xc0 fs/fuse/file.c:175
fuse_dir_open+0x110/0x220 fs/fuse/dir.c:1676
do_dentry_open+0xdec/0x1960 fs/open.c:956
vfs_open+0x3b/0x370 fs/open.c:1086
do_open fs/namei.c:3830 [inline]
path_openat+0x2c81/0x3590 fs/namei.c:3989
do_filp_open+0x27f/0x4e0 fs/namei.c:4016
do_sys_openat2+0x13e/0x1d0 fs/open.c:1428
do_sys_open fs/open.c:1443 [inline]
__do_sys_openat fs/open.c:1459 [inline]
__se_sys_openat fs/open.c:1454 [inline]
__x64_sys_openat+0x247/0x2a0 fs/open.c:1454
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f80e2b8bad0
RSP: 002b:00007f80e3ac8df0 EFLAGS: 00000293 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 0000000000010000 RCX: 00007f80e2b8bad0
RDX: 0000000000010000 RSI: 0000200000000000 RDI: 00000000ffffff9c
RBP: 0000200000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000293 R12: 0000200000000000
R13: 00007f80e3ac8eb0 R14: 0000000000000000 R15: 0000200000002280
Showing all locks held in the system:
2 locks held by kworker/u8:0/12:
1 lock held by khungtaskd/31:
#0: ffffffff8eb393e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8eb393e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8eb393e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6746
2 locks held by getty/5580:
#0: ffff888031c7c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002fde2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x616/0x1770 drivers/tty/n_tty.c:2211
2 locks held by kworker/u8:10/11714:
1 lock held by syz-executor/17235:
#0: ffffffff8eb3e8b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:334 [inline]
#0: ffffffff8eb3e8b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x451/0x820 kernel/rcu/tree_exp.h:996
2 locks held by dhcpcd/19426:
#0: ffff8880782a8808 (&sb->s_type->i_mutex_key#9){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:877 [inline]
#0: ffff8880782a8808 (&sb->s_type->i_mutex_key#9){+.+.}-{4:4}, at: __sock_release net/socket.c:646 [inline]
#0: ffff8880782a8808 (&sb->s_type->i_mutex_key#9){+.+.}-{4:4}, at: sock_close+0x90/0x240 net/socket.c:1398
#1: ffffffff8eb3e8b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:334 [inline]
#1: ffffffff8eb3e8b8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x451/0x820 kernel/rcu/tree_exp.h:996
2 locks held by syz.1.1361/19497:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.14.0-rc7-syzkaller-00179-gb3ee1e460951 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:236 [inline]
watchdog+0x1058/0x10a0 kernel/hung_task.c:399
kthread+0x7a9/0x920 kernel/kthread.c:464
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148
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: 19445 Comm: syz.8.1355 Not tainted 6.14.0-rc7-syzkaller-00179-gb3ee1e460951 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:lock_release+0x253/0xa30 kernel/locking/lockdep.c:5872
Code: 42 0f b6 04 38 84 c0 0f 85 78 05 00 00 8b 06 85 c0 0f 84 2e 02 00 00 48 89 34 24 48 89 54 24 08 48 89 5c 24 28 4c 89 64 24 10 <48> 89 44 24 38 8d 58 ff 4d 8d b5 f0 0a 00 00 4c 63 eb 41 83 fd 31
RSP: 0018:ffffc90002e56f80 EFLAGS: 00000002
RAX: 0000000000000002 RBX: 0000000000000246 RCX: ffffc90002e57003
RDX: 1ffff920005cae00 RSI: ffff8880798546e8 RDI: ffffffff8c802ce0
RBP: ffffc90002e570b8 R08: ffffffff903bd177 R09: 1ffffffff2077a2e
R10: dffffc0000000000 R11: fffffbfff2077a2f R12: 1ffff920005cadfc
R13: ffff888079853c00 R14: ffffffff8eb393e0 R15: dffffc0000000000
FS: 0000000000000000(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555e7af5c8 CR3: 00000000345b2000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
rcu_lock_release include/linux/rcupdate.h:347 [inline]
rcu_read_unlock include/linux/rcupdate.h:880 [inline]
page_ref_add_unless include/linux/page_ref.h:239 [inline]
folio_ref_add_unless include/linux/page_ref.h:248 [inline]
folio_try_get+0x223/0x350 include/linux/page_ref.h:264
find_get_entry mm/filemap.c:2039 [inline]
find_lock_entries+0x2bf/0xbb0 mm/filemap.c:2129
shmem_undo_range+0x2d4/0x1820 mm/shmem.c:1094
shmem_truncate_range mm/shmem.c:1224 [inline]
shmem_evict_inode+0x29b/0xa80 mm/shmem.c:1352
evict+0x4e8/0x9a0 fs/inode.c:796
__dentry_kill+0x20d/0x630 fs/dcache.c:643
dput+0x19f/0x2b0 fs/dcache.c:885
__fput+0x60b/0x9f0 fs/file_table.c:472
task_work_run+0x24f/0x310 kernel/task_work.c:227
exit_task_work include/linux/task_work.h:40 [inline]
do_exit+0xa2a/0x2940 kernel/exit.c:938
do_group_exit+0x207/0x2c0 kernel/exit.c:1087
get_signal+0x168c/0x1720 kernel/signal.c:3036
arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:337
exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
__syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
syscall_exit_to_user_mode+0xce/0x340 kernel/entry/common.c:218
do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8d3ef8bc1f
Code: Unable to access opcode bytes at 0x7f8d3ef8bbf5.
RSP: 002b:00007f8d3fe6adf0 EFLAGS: 00000293 ORIG_RAX: 0000000000000001
RAX: 0000000000f73000 RBX: 0000000001000000 RCX: 00007f8d3ef8bc1f
RDX: 0000000001000000 RSI: 00007f8d34800000 RDI: 0000000000000009
RBP: 0000000000000000 R08: 0000000000000000 R09: 00000000000050ed
R10: 000020000000a2c2 R11: 0000000000000293 R12: 0000000000000009
R13: 00007f8d3fe6aef0 R14: 00007f8d3fe6aeb0 R15: 00007f8d34800000