INFO: task syz.6.1539:10294 blocked for more than 143 seconds.
Not tainted 6.1.129-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.1539 state:D stack:27856 pid:10294 ppid:6866 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5243 [inline]
__schedule+0x143f/0x4570 kernel/sched/core.c:6560
schedule+0xbf/0x180 kernel/sched/core.c:6636
rwsem_down_write_slowpath+0xea1/0x14b0 kernel/locking/rwsem.c:1189
inode_lock include/linux/fs.h:758 [inline]
open_last_lookups fs/namei.c:3547 [inline]
path_openat+0x7b6/0x2e60 fs/namei.c:3780
do_filp_open+0x230/0x480 fs/namei.c:3810
do_sys_openat2+0x13b/0x4f0 fs/open.c:1318
do_sys_open fs/open.c:1334 [inline]
__do_sys_openat fs/open.c:1350 [inline]
__se_sys_openat fs/open.c:1345 [inline]
__x64_sys_openat+0x243/0x290 fs/open.c:1345
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7fc10ed8d169
RSP: 002b:00007fc10ebde038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007fc10efa6080 RCX: 00007fc10ed8d169
RDX: 000000000000275a RSI: 0000400000000040 RDI: ffffffffffffff9c
RBP: 00007fc10ee0e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fc10efa6080 R15: 00007fff95041ae8
Showing all locks held in the system:
1 lock held by rcu_tasks_kthre/12:
#0: ffffffff8d32e850 (rcu_tasks.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:517
1 lock held by rcu_tasks_trace/13:
#0: ffffffff8d32f050 (rcu_tasks_trace.tasks_gp_mutex){+.+.}-{3:3}, at: rcu_tasks_one_gp+0x29/0xe30 kernel/rcu/tasks.h:517
1 lock held by khungtaskd/28:
#0: ffffffff8d32e680 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:350 [inline]
#0: ffffffff8d32e680 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:791 [inline]
#0: ffffffff8d32e680 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x51/0x290 kernel/locking/lockdep.c:6510
3 locks held by kworker/u4:3/51:
2 locks held by syz.6.1539/10289:
2 locks held by syz.6.1539/10294:
#0: ffff888064a22460 (sb_writers#39){.+.+}-{0:0}, at: mnt_want_write+0x3b/0x80 fs/namespace.c:393
#1: ffff888055710188 (&type->i_mutex_dir_key#31){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
#1: ffff888055710188 (&type->i_mutex_dir_key#31){+.+.}-{3:3}, at: open_last_lookups fs/namei.c:3547 [inline]
#1: ffff888055710188 (&type->i_mutex_dir_key#31){+.+.}-{3:3}, at: path_openat+0x7b6/0x2e60 fs/namei.c:3780
2 locks held by getty/11358:
#0: ffff88814c975098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:244
#1: ffffc9000d0cb2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x54a/0x1620 drivers/tty/n_tty.c:2198
1 lock held by syz.1.1875/11636:
#0: ffff88807091be10 (&sb->s_type->i_mutex_key#22){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
#0: ffff88807091be10 (&sb->s_type->i_mutex_key#22){+.+.}-{3:3}, at: fuse_flush+0x274/0x950 fs/fuse/file.c:499
3 locks held by syz.1.1875/11637:
#0: ffff8880757fcae8 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2ba/0x360 fs/file.c:1032
#1: ffff8880792f2460 (sb_writers#15){.+.+}-{0:0}, at: vfs_write+0x269/0xbc0 fs/read_write.c:580
#2: ffff88807091be10 (&sb->s_type->i_mutex_key#22){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:758 [inline]
#2: ffff88807091be10 (&sb->s_type->i_mutex_key#22){+.+.}-{3:3}, at: fuse_cache_write_iter fs/fuse/file.c:1324 [inline]
#2: ffff88807091be10 (&sb->s_type->i_mutex_key#22){+.+.}-{3:3}, at: fuse_file_write_iter+0x2d0/0x10e0 fs/fuse/file.c:1656
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 28 Comm: khungtaskd Not tainted 6.1.129-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2cb lib/dump_stack.c:106
nmi_cpu_backtrace+0x4e1/0x560 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x1ca/0x430 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:220 [inline]
watchdog+0xf88/0xfd0 kernel/hung_task.c:377
kthread+0x28d/0x320 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 11644 Comm: syz.0.1873 Not tainted 6.1.129-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:__copy_msghdr net/socket.c:2405 [inline]
RIP: 0010:copy_msghdr_from_user+0x232/0x670 net/socket.c:2452
Code: b6 04 30 84 c0 0f 85 55 03 00 00 44 8b a4 24 90 00 00 00 49 8d 5f 44 48 89 d8 48 c1 e8 03 0f b6 04 30 84 c0 0f 85 5f 03 00 00 <44> 89 23 49 8d 7d 08 48 89 f8 48 c1 e8 03 0f b6 04 30 84 c0 0f 85
RSP: 0018:ffffc90004657980 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffffc90004657d64 RCX: ffff88802ab23b80
RDX: ffffc9000ed9b000 RSI: dffffc0000000000 RDI: ffffc90004657a10
RBP: ffffc90004657a90 R08: ffffffff889c0797 R09: fffff520008caf43
R10: 0000000000000000 R11: dffffc0000000001 R12: 0000000000000000
R13: ffffc900046579e0 R14: ffffc90004657c20 R15: ffffc90004657d20
FS: 00007efc18fde6c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ff48eb78ab8 CR3: 000000005fcae000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
recvmsg_copy_msghdr net/socket.c:2704 [inline]
___sys_recvmsg net/socket.c:2776 [inline]
do_recvmmsg+0x408/0xad0 net/socket.c:2874
__sys_recvmmsg net/socket.c:2953 [inline]
__do_sys_recvmmsg net/socket.c:2976 [inline]
__se_sys_recvmmsg net/socket.c:2969 [inline]
__x64_sys_recvmmsg+0x195/0x240 net/socket.c:2969
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7efc1918d169
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007efc18fde038 EFLAGS: 00000246 ORIG_RAX: 000000000000012b
RAX: ffffffffffffffda RBX: 00007efc193a6080 RCX: 00007efc1918d169
RDX: 0000000000010106 RSI: 00004000000000c0 RDI: 0000000000000007
RBP: 00007efc1920e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007efc193a6080 R15: 00007ffd6af5a838