INFO: task syz.0.16:6599 blocked for more than 143 seconds.
Not tainted 6.15.0-syzkaller-10820-gcd2e103d57e5 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.16 state:D stack:28584 pid:6599 tgid:6587 ppid:6455 task_flags:0x400040 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5392 [inline]
__schedule+0x16a2/0x4cb0 kernel/sched/core.c:6781
__schedule_loop kernel/sched/core.c:6859 [inline]
schedule+0x165/0x360 kernel/sched/core.c:6874
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6931
rwsem_down_write_slowpath+0xbec/0x1030 kernel/locking/rwsem.c:1176
__down_write_common kernel/locking/rwsem.c:1304 [inline]
__down_write kernel/locking/rwsem.c:1313 [inline]
down_write_nested+0x1b5/0x200 kernel/locking/rwsem.c:1694
inode_lock_nested include/linux/fs.h:912 [inline]
lock_two_directories+0x16b/0x220 fs/namei.c:3243
lock_rename fs/namei.c:3277 [inline]
do_renameat2+0x38a/0xc50 fs/namei.c:5223
__do_sys_rename fs/namei.c:5324 [inline]
__se_sys_rename fs/namei.c:5322 [inline]
__x64_sys_rename+0x82/0x90 fs/namei.c:5322
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6a9258e969
RSP: 002b:00007f6a93429038 EFLAGS: 00000246 ORIG_RAX: 0000000000000052
RAX: ffffffffffffffda RBX: 00007f6a927b6080 RCX: 00007f6a9258e969
RDX: 0000000000000000 RSI: 00002000000001c0 RDI: 0000200000000000
RBP: 00007f6a92610ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f6a927b6080 R15: 00007ffd0b41e3e8
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e13d080 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e13d080 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e13d080 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770
2 locks held by getty/5584:
#0: ffff88803045b0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc90002fee2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222
3 locks held by syz.0.16/6588:
4 locks held by syz.0.16/6599:
#0: ffff88807e214428 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557
#1: ffff88807e214738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: lock_rename fs/namei.c:3276 [inline]
#1: ffff88807e214738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: do_renameat2+0x37f/0xc50 fs/namei.c:5223
#2: ffff888075b776a0 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:912 [inline]
#2: ffff888075b776a0 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: lock_two_directories+0x141/0x220 fs/namei.c:3242
#3: ffff888075a003e0 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:912 [inline]
#3: ffff888075a003e0 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: lock_two_directories+0x16b/0x220 fs/namei.c:3243
3 locks held by syz.1.17/6771:
4 locks held by syz.1.17/6775:
#0: ffff888027884428 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557
#1: ffff888027884738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: lock_rename fs/namei.c:3276 [inline]
#1: ffff888027884738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: do_renameat2+0x37f/0xc50 fs/namei.c:5223
#2: ffff888075a05060 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:912 [inline]
#2: ffff888075a05060 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: lock_two_directories+0x141/0x220 fs/namei.c:3242
#3: ffff888075a06380 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:912 [inline]
#3: ffff888075a06380 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: lock_two_directories+0x16b/0x220 fs/namei.c:3243
4 locks held by syz.2.18/6792:
4 locks held by syz.2.18/6796:
#0: ffff8880792d4428 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557
#1: ffff8880792d4738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: lock_rename fs/namei.c:3276 [inline]
#1: ffff8880792d4738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: do_renameat2+0x37f/0xc50 fs/namei.c:5223
#2: ffff88807594aa20 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:912 [inline]
#2: ffff88807594aa20 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: lock_two_directories+0x141/0x220 fs/namei.c:3242
#3: ffff888033943d40 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:912 [inline]
#3: ffff888033943d40 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: lock_two_directories+0x16b/0x220 fs/namei.c:3243
8 locks held by syz.3.19/6819:
4 locks held by syz.3.19/6823:
#0: ffff888028806428 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557
#1: ffff888028806738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: lock_rename fs/namei.c:3276 [inline]
#1: ffff888028806738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: do_renameat2+0x37f/0xc50 fs/namei.c:5223
#2: ffff888075a01700 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:912 [inline]
#2: ffff888075a01700 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: lock_two_directories+0x141/0x220 fs/namei.c:3242
#3: ffff88805dd78d70 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:912 [inline]
#3: ffff88805dd78d70 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: lock_two_directories+0x16b/0x220 fs/namei.c:3243
3 locks held by syz.4.20/6846:
4 locks held by syz.4.20/6850:
#0: ffff888061950428 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557
#1: ffff888061950738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: lock_rename fs/namei.c:3276 [inline]
#1: ffff888061950738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: do_renameat2+0x37f/0xc50 fs/namei.c:5223
#2: ffff88805dd7d060 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:912 [inline]
#2: ffff88805dd7d060 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: lock_two_directories+0x141/0x220 fs/namei.c:3242
#3: ffff88807594d9f0 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:912 [inline]
#3: ffff88807594d9f0 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: lock_two_directories+0x16b/0x220 fs/namei.c:3243
4 locks held by syz.5.21/6873:
4 locks held by syz.5.21/6877:
#0: ffff88807dd50428 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557
#1: ffff88807dd50738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: lock_rename fs/namei.c:3276 [inline]
#1: ffff88807dd50738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: do_renameat2+0x37f/0xc50 fs/namei.c:5223
#2: ffff88805dd7e380 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:912 [inline]
#2: ffff88805dd7e380 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: lock_two_directories+0x141/0x220 fs/namei.c:3242
#3: ffff88805dd7f6a0 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:912 [inline]
#3: ffff88805dd7f6a0 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: lock_two_directories+0x16b/0x220 fs/namei.c:3243
3 locks held by syz.6.22/6908:
4 locks held by syz.6.22/6912:
#0: ffff8880518bc428 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557
#1: ffff8880518bc738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: lock_rename fs/namei.c:3276 [inline]
#1: ffff8880518bc738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: do_renameat2+0x37f/0xc50 fs/namei.c:5223
#2: ffff88805dd72a20 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:912 [inline]
#2: ffff88805dd72a20 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: lock_two_directories+0x141/0x220 fs/namei.c:3242
#3: ffff88805dd73d40 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:912 [inline]
#3: ffff88805dd73d40 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: lock_two_directories+0x16b/0x220 fs/namei.c:3243
3 locks held by syz.7.23/6937:
4 locks held by syz.7.23/6941:
#0: ffff88807bba0428 (sb_writers#4){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:557
#1: ffff88807bba0738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: lock_rename fs/namei.c:3276 [inline]
#1: ffff88807bba0738 (&type->s_vfs_rename_key){+.+.}-{4:4}, at: do_renameat2+0x37f/0xc50 fs/namei.c:5223
#2: ffff88805dd75060 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:912 [inline]
#2: ffff88805dd75060 (&type->i_mutex_dir_key#3/1){+.+.}-{4:4}, at: lock_two_directories+0x141/0x220 fs/namei.c:3242
#3: ffff888075b50d70 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:912 [inline]
#3: ffff888075b50d70 (&type->i_mutex_dir_key#3/5){+.+.}-{4:4}, at: lock_two_directories+0x16b/0x220 fs/namei.c:3243
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.15.0-syzkaller-10820-gcd2e103d57e5 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline]
watchdog+0xfee/0x1030 kernel/hung_task.c:470
kthread+0x711/0x8a0 kernel/kthread.c:464
ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
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: 6908 Comm: syz.6.22 Not tainted 6.15.0-syzkaller-10820-gcd2e103d57e5 #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:get_current arch/x86/include/asm/current.h:25 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x70 kernel/kcov.c:216
Code: 8b 3d 54 ea f7 0b 48 89 de 5b e9 83 8d 56 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 8b 04 24 <65> 48 8b 0c 25 08 b0 98 92 65 8b 15 38 76 d8 10 81 e2 00 01 ff 00
RSP: 0018:ffffc9000428f130 EFLAGS: 00000202
RAX: ffffffff826a6a44 RBX: 0000000000000001 RCX: 56aa7f6e8e5a0700
RDX: ffff888026908000 RSI: ffffffff8be19b60 RDI: ffffffff8be19b20
RBP: 0000000000001938 R08: ffffffff8f9f92f7 R09: 1ffffffff1f3f25e
R10: dffffc0000000000 R11: fffffbfff1f3f25f R12: 0000000000000000
R13: ffff8880518bc000 R14: 0000000000000001 R15: 0000000000000000
FS: 00007ff8a28796c0(0000) GS:ffff888125c95000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdc4ab9bf98 CR3: 000000007eac2000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
trace_ext4_journal_start_inode include/trace/events/ext4.h:1784 [inline]
__ext4_journal_start_sb+0xb4/0x5c0 fs/ext4/ext4_jbd2.c:101
__ext4_journal_start fs/ext4/ext4_jbd2.h:242 [inline]
ext4_dirty_inode+0x93/0x110 fs/ext4/inode.c:6456
__mark_inode_dirty+0x2d1/0xdf0 fs/fs-writeback.c:2527
mark_inode_dirty include/linux/fs.h:2594 [inline]
dquot_alloc_space include/linux/quotaops.h:319 [inline]
dquot_alloc_block include/linux/quotaops.h:336 [inline]
ext4_xattr_block_set+0x12ca/0x2ac0 fs/ext4/xattr.c:2048
ext4_xattr_set_handle+0xdfb/0x1590 fs/ext4/xattr.c:2447
ext4_initxattrs+0x9f/0x110 fs/ext4/xattr_security.c:44
security_inode_init_security+0x29d/0x3f0 security/security.c:1852
__ext4_new_inode+0x3257/0x3c50 fs/ext4/ialloc.c:1325
ext4_create+0x22d/0x460 fs/ext4/namei.c:2822
lookup_open fs/namei.c:3708 [inline]
open_last_lookups fs/namei.c:3807 [inline]
path_openat+0x14f1/0x3830 fs/namei.c:4043
do_filp_open+0x1fa/0x410 fs/namei.c:4073
do_sys_openat2+0x121/0x1c0 fs/open.c:1437
do_sys_open fs/open.c:1452 [inline]
__do_sys_openat fs/open.c:1468 [inline]
__se_sys_openat fs/open.c:1463 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1463
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff8a198e969
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:00007ff8a2879038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007ff8a1bb5fa0 RCX: 00007ff8a198e969
RDX: 0000000000101042 RSI: 0000200000000140 RDI: ffffffffffffff9c
RBP: 00007ff8a1a10ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007ff8a1bb5fa0 R15: 00007ffe4d7a4998