INFO: task syz-executor.2:11678 blocked for more than 143 seconds.
Not tainted 6.8.0-rc6-syzkaller-00278-g58c806d867bf #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2 state:D stack:25776 pid:11678 tgid:11677 ppid:5092 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5400 [inline]
__schedule+0x177f/0x49a0 kernel/sched/core.c:6727
__schedule_loop kernel/sched/core.c:6802 [inline]
schedule+0x149/0x260 kernel/sched/core.c:6817
request_wait_answer fs/fuse/dev.c:407 [inline]
__fuse_request_send fs/fuse/dev.c:426 [inline]
fuse_simple_request+0x1198/0x1b90 fs/fuse/dev.c:513
fuse_dentry_revalidate+0x524/0xbc0 fs/fuse/dir.c:233
d_revalidate fs/namei.c:862 [inline]
__lookup_slow+0x1bb/0x3f0 fs/namei.c:1682
lookup_slow+0x53/0x70 fs/namei.c:1710
walk_component+0x2e1/0x410 fs/namei.c:2005
lookup_last fs/namei.c:2462 [inline]
path_lookupat+0x16f/0x450 fs/namei.c:2486
filename_lookup+0x255/0x610 fs/namei.c:2515
vfs_statx+0x105/0x4e0 fs/stat.c:244
do_statx fs/stat.c:681 [inline]
__do_sys_statx fs/stat.c:708 [inline]
__se_sys_statx fs/stat.c:699 [inline]
__x64_sys_statx+0x1a4/0x240 fs/stat.c:699
do_syscall_64+0xf9/0x240
entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7ff20f87dda9
RSP: 002b:00007ff2105340c8 EFLAGS: 00000246 ORIG_RAX: 000000000000014c
RAX: ffffffffffffffda RBX: 00007ff20f9abf80 RCX: 00007ff20f87dda9
RDX: 0000000000000000 RSI: 0000000020000000 RDI: ffffffffffffff9c
RBP: 00007ff20f8ca47a R08: 00000000200065c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007ff20f9abf80 R15: 00007ffd0e4aeac8
INFO: task syz-executor.2:11683 blocked for more than 143 seconds.
Not tainted 6.8.0-rc6-syzkaller-00278-g58c806d867bf #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor.2 state:D stack:24080 pid:11683 tgid:11677 ppid:5092 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5400 [inline]
__schedule+0x177f/0x49a0 kernel/sched/core.c:6727
__schedule_loop kernel/sched/core.c:6802 [inline]
schedule+0x149/0x260 kernel/sched/core.c:6817
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6874
rwsem_down_write_slowpath+0xeea/0x13b0 kernel/locking/rwsem.c:1178
__down_write_common+0x1ae/0x200 kernel/locking/rwsem.c:1306
inode_lock_nested include/linux/fs.h:839 [inline]
filename_create+0x260/0x540 fs/namei.c:3895
do_mkdirat+0xbd/0x3a0 fs/namei.c:4141
__do_sys_mkdirat fs/namei.c:4164 [inline]
__se_sys_mkdirat fs/namei.c:4162 [inline]
__x64_sys_mkdirat+0x89/0xa0 fs/namei.c:4162
do_syscall_64+0xf9/0x240
entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7ff20f87c8a7
RSP: 002b:00007ff210512ef8 EFLAGS: 00000202 ORIG_RAX: 0000000000000102
RAX: ffffffffffffffda RBX: 00007ff210512f80 RCX: 00007ff20f87c8a7
RDX: 00000000000001ff RSI: 0000000020000140 RDI: 00000000ffffff9c
RBP: 0000000020000200 R08: 0000000000000000 R09: 00000000000001c5
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000020000140
R13: 00007ff210512f40 R14: 00000000000001cb R15: 0000000020000500
Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8e130be0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#0: ffffffff8e130be0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#0: ffffffff8e130be0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614
2 locks held by getty/4806:
#0: ffff88802ee0a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900031332f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b4/0x1e10 drivers/tty/n_tty.c:2201
1 lock held by syz-executor.2/11678:
#0: ffff88805a825910 (&type->i_mutex_dir_key#32){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:814 [inline]
#0: ffff88805a825910 (&type->i_mutex_dir_key#32){.+.+}-{3:3}, at: lookup_slow+0x45/0x70 fs/namei.c:1709
2 locks held by syz-executor.2/11683:
#0: ffff88805ad06420 (sb_writers#37){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:409
#1: ffff88805a825910 (&type->i_mutex_dir_key#32/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:839 [inline]
#1: ffff88805a825910 (&type->i_mutex_dir_key#32/1){+.+.}-{3:3}, at: filename_create+0x260/0x540 fs/namei.c:3895
1 lock held by syz-executor.3/11909:
#0: ffff88805c6c3750 (&type->i_mutex_dir_key#32){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:814 [inline]
#0: ffff88805c6c3750 (&type->i_mutex_dir_key#32){.+.+}-{3:3}, at: lookup_slow+0x45/0x70 fs/namei.c:1709
2 locks held by syz-executor.3/11914:
#0: ffff88802ec62420 (sb_writers#37){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:409
#1: ffff88805c6c3750 (&type->i_mutex_dir_key#32/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:839 [inline]
#1: ffff88805c6c3750 (&type->i_mutex_dir_key#32/1){+.+.}-{3:3}, at: filename_create+0x260/0x540 fs/namei.c:3895
1 lock held by syz-executor.2/11989:
#0: ffff88805c6c1590 (&type->i_mutex_dir_key#32){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:814 [inline]
#0: ffff88805c6c1590 (&type->i_mutex_dir_key#32){.+.+}-{3:3}, at: lookup_slow+0x45/0x70 fs/namei.c:1709
2 locks held by syz-executor.2/11993:
#0: ffff888066778420 (sb_writers#37){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:409
#1: ffff88805c6c1590 (&type->i_mutex_dir_key#32/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:839 [inline]
#1: ffff88805c6c1590 (&type->i_mutex_dir_key#32/1){+.+.}-{3:3}, at: filename_create+0x260/0x540 fs/namei.c:3895
1 lock held by syz-executor.3/12082:
#0: ffff88805c6c1c50 (&type->i_mutex_dir_key#32){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:814 [inline]
#0: ffff88805c6c1c50 (&type->i_mutex_dir_key#32){.+.+}-{3:3}, at: lookup_slow+0x45/0x70 fs/namei.c:1709
2 locks held by syz-executor.3/12089:
#0: ffff8880455f8420 (sb_writers#37){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:409
#1: ffff88805c6c1c50 (&type->i_mutex_dir_key#32/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:839 [inline]
#1: ffff88805c6c1c50 (&type->i_mutex_dir_key#32/1){+.+.}-{3:3}, at: filename_create+0x260/0x540 fs/namei.c:3895
1 lock held by syz-executor.2/12200:
#0: ffff88805a827410 (&type->i_mutex_dir_key#32){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:814 [inline]
#0: ffff88805a827410 (&type->i_mutex_dir_key#32){.+.+}-{3:3}, at: lookup_slow+0x45/0x70 fs/namei.c:1709
2 locks held by syz-executor.2/12206:
#0: ffff88807e404420 (sb_writers#37){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:409
#1: ffff88805a827410 (&type->i_mutex_dir_key#32/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:839 [inline]
#1: ffff88805a827410 (&type->i_mutex_dir_key#32/1){+.+.}-{3:3}, at: filename_create+0x260/0x540 fs/namei.c:3895
1 lock held by syz-executor.3/12327:
#0: ffff88805a821c50 (&type->i_mutex_dir_key#32){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:814 [inline]
#0: ffff88805a821c50 (&type->i_mutex_dir_key#32){.+.+}-{3:3}, at: lookup_slow+0x45/0x70 fs/namei.c:1709
2 locks held by syz-executor.3/12332:
#0: ffff888048b96420 (sb_writers#37){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:409
#1: ffff88805a821c50 (&type->i_mutex_dir_key#32/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:839 [inline]
#1: ffff88805a821c50 (&type->i_mutex_dir_key#32/1){+.+.}-{3:3}, at: filename_create+0x260/0x540 fs/namei.c:3895
1 lock held by syz-executor.2/12471:
#0: ffff88805c6c3e10 (&type->i_mutex_dir_key#32){.+.+}-{3:3}, at: inode_lock_shared include/linux/fs.h:814 [inline]
#0: ffff88805c6c3e10 (&type->i_mutex_dir_key#32){.+.+}-{3:3}, at: lookup_slow+0x45/0x70 fs/namei.c:1709
2 locks held by syz-executor.2/12475:
#0: ffff888033a8a420 (sb_writers#37){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:409
#1: ffff88805c6c3e10 (&type->i_mutex_dir_key#32/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:839 [inline]
#1: ffff88805c6c3e10 (&type->i_mutex_dir_key#32/1){+.+.}-{3:3}, at: filename_create+0x260/0x540 fs/namei.c:3895
2 locks held by syz-executor.4/12630:
1 lock held by syz-executor.1/12629:
#0: ffffffff8e136578 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:292 [inline]
#0: ffffffff8e136578 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x3a3/0x890 kernel/rcu/tree_exp.h:995
1 lock held by syz-executor.0/12631:
#0: ffff8880b943c918 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:559
2 locks held by syz-executor.3/12685:
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.8.0-rc6-syzkaller-00278-g58c806d867bf #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106
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:160 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
watchdog+0xfaf/0xff0 kernel/hung_task.c:379
kthread+0x2ef/0x390 kernel/kthread.c:388
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1b/0x30 arch/x86/entry/entry_64.S:243
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 4490 Comm: syslogd Not tainted 6.8.0-rc6-syzkaller-00278-g58c806d867bf #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024
RIP: 0010:lookup_chain_cache kernel/locking/lockdep.c:3762 [inline]
RIP: 0010:lookup_chain_cache_add kernel/locking/lockdep.c:3782 [inline]
RIP: 0010:validate_chain+0x1b1/0x58e0 kernel/locking/lockdep.c:3837
Code: 0b 90 90 90 48 b8 eb 83 b5 80 46 86 c8 61 49 0f af c6 48 c1 e8 2f 48 8d 1c c5 a0 83 b1 92 48 89 d8 48 c1 e8 03 48 89 44 24 60 <42> 80 3c 20 00 74 08 48 89 df e8 40 73 80 00 48 89 5c 24 40 48 8b
RSP: 0018:ffffc9000310f2a0 EFLAGS: 00000802
RAX: 1ffffffff256b304 RBX: ffffffff92b59820 RCX: ffffffff8171c88b
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff92c584c0
RBP: ffffc9000310f5a0 R08: ffffffff92c584c7 R09: 1ffffffff258b098
R10: dffffc0000000000 R11: fffffbfff258b099 R12: dffffc0000000000
R13: ffff888064e728a0 R14: 8b8d15331af7f34d R15: ffff888064e71dc0
FS: 00007fd0dcb03380(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30e2a000 CR3: 000000002d130000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
__lock_acquire+0x1345/0x1fd0 kernel/locking/lockdep.c:5137
lock_acquire+0x1e3/0x530 kernel/locking/lockdep.c:5754
__mutex_lock_common kernel/locking/mutex.c:608 [inline]
__mutex_lock+0x136/0xd70 kernel/locking/mutex.c:752
__unix_dgram_recvmsg+0x251/0x12c0 net/unix/af_unix.c:2365
sock_recvmsg_nosec net/socket.c:1046 [inline]
sock_recvmsg+0x22f/0x280 net/socket.c:1068
sock_read_iter+0x2ca/0x3e0 net/socket.c:1138
call_read_iter include/linux/fs.h:2081 [inline]
new_sync_read fs/read_write.c:395 [inline]
vfs_read+0x978/0xb70 fs/read_write.c:476
ksys_read+0x1a0/0x2c0 fs/read_write.c:619
do_syscall_64+0xf9/0x240
entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7fd0dcc57b6a
Code: 00 3d 00 00 41 00 75 0d 50 48 8d 3d 2d 08 0a 00 e8 ea 7d 01 00 31 c0 e9 07 ff ff ff 64 8b 04 25 18 00 00 00 85 c0 75 1b 0f 05 <48> 3d 00 f0 ff ff 76 6c 48 8b 15 8f a2 0d 00 f7 d8 64 89 02 48 83
RSP: 002b:00007ffdbce4cd08 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007fd0dcc57b6a
RDX: 00000000000000ff RSI: 000056170983b950 RDI: 0000000000000000
RBP: 000056170983b910 R08: 0000000000000001 R09: 0000000000000000
R10: 00007fd0dcdf63a3 R11: 0000000000000246 R12: 000056170983b99d
R13: 000056170983b950 R14: 0000000000000000 R15: 00007fd0dce34a80