INFO: task syz-fuzzer:5066 blocked for more than 143 seconds.
Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-fuzzer state:D stack:26240 pid:5066 tgid:5053 ppid:5051 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5409 [inline]
__schedule+0xf15/0x5c70 kernel/sched/core.c:6736
__schedule_loop kernel/sched/core.c:6813 [inline]
schedule+0xe7/0x350 kernel/sched/core.c:6828
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6885
rwsem_down_write_slowpath kernel/locking/rwsem.c:1178 [inline]
__down_write_common+0x950/0x13f0 kernel/locking/rwsem.c:1306
inode_lock include/linux/fs.h:793 [inline]
vfs_unlink+0xd3/0x910 fs/namei.c:4327
do_unlinkat+0x5c0/0x750 fs/namei.c:4402
__do_sys_unlinkat fs/namei.c:4445 [inline]
__se_sys_unlinkat fs/namei.c:4438 [inline]
__x64_sys_unlinkat+0xc1/0x130 fs/namei.c:4438
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x40720e
RSP: 002b:000000c000d8f638 EFLAGS: 00000202 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 0000000000000015 RCX: 000000000040720e
RDX: 0000000000000000 RSI: 000000c0016f4620 RDI: 0000000000000015
RBP: 000000c000d8f678 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 000000c000f7d400 R14: 000000c0000aeb60 R15: 0000000000000031
Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
#0: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline]
#0: ffffffff8d7b08e0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6614
2 locks held by kworker/0:2/783:
#0: ffff8880b943e698 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:559
#1: ffff8880b9428a08 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x2d9/0x900 kernel/sched/psi.c:988
2 locks held by getty/4816:
#0: ffff88802a88f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc900015f02f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc8/0x1490 drivers/tty/n_tty.c:2201
3 locks held by syz-fuzzer/5066:
#0: ffff88802f12e420 (sb_writers#5){.+.+}-{0:0}, at: do_unlinkat+0x1d3/0x750 fs/namei.c:4385
#1: ffff888056dcca00 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: inode_lock_nested include/linux/fs.h:828 [inline]
#1: ffff888056dcca00 (&type->i_mutex_dir_key#3/1){+.+.}-{3:3}, at: do_unlinkat+0x288/0x750 fs/namei.c:4389
#2: ffff8880606db600 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: inode_lock include/linux/fs.h:793 [inline]
#2: ffff8880606db600 (&sb->s_type->i_mutex_key#7){++++}-{3:3}, at: vfs_unlink+0xd3/0x910 fs/namei.c:4327
1 lock held by syz-executor.3/7494:
1 lock held by syz-executor.3/7499:
4 locks held by syz-executor.3/7500:
2 locks held by syz-executor.4/7619:
1 lock held by syz-executor.4/7623:
5 locks held by syz-executor.4/7625:
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114
nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x29c/0x300 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+0xf86/0x1210 kernel/hung_task.c:379
kthread+0x2c1/0x3a0 kernel/kthread.c:388
ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:243
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 7623 Comm: syz-executor.4 Not tainted 6.8.0-syzkaller-08951-gfe46a7dd189e #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:task_irq_context kernel/locking/lockdep.c:4607 [inline]
RIP: 0010:__lock_acquire+0x365/0x3b30 kernel/locking/lockdep.c:5074
Code: 14 02 48 89 f0 83 e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 bd 10 00 00 48 8b 04 24 49 8d 7e 24 8b 54 24 08 83 b8 bc 0a 00 00 01 <44> 89 e0 83 d8 ff c1 e5 0f c1 e0 0d c1 e1 10 0f b7 ed 09 e8 81 e1
RSP: 0018:ffffc90003aaf330 EFLAGS: 00000097
RAX: ffff888022ea9e00 RBX: 0000000000000000 RCX: 0000000000000002
RDX: 0000000000000000 RSI: ffff888022eaa8bc RDI: ffff888022eaa924
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000000 R14: ffff888022eaa900 R15: 0000000000000021
FS: 00007f761e1c06c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005643dde9caa0 CR3: 00000000233f2000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
lock_acquire kernel/locking/lockdep.c:5754 [inline]
lock_acquire+0x1b1/0x540 kernel/locking/lockdep.c:5719
rcu_lock_acquire include/linux/rcupdate.h:298 [inline]
rcu_read_lock include/linux/rcupdate.h:750 [inline]
percpu_ref_get_many include/linux/percpu-refcount.h:202 [inline]
percpu_ref_get include/linux/percpu-refcount.h:222 [inline]
css_get include/linux/cgroup_refcnt.h:11 [inline]
css_get include/linux/cgroup_refcnt.h:8 [inline]
mem_cgroup_commit_charge+0x258/0x400 mm/memcontrol.c:2970
charge_memcg mm/memcontrol.c:7280 [inline]
__mem_cgroup_charge+0xb5/0x140 mm/memcontrol.c:7291
mem_cgroup_charge include/linux/memcontrol.h:690 [inline]
__filemap_add_folio+0x83d/0xec0 mm/filemap.c:864
filemap_add_folio+0xb1/0x1f0 mm/filemap.c:947
page_cache_ra_unbounded+0x1ce/0x5f0 mm/readahead.c:250
do_page_cache_ra mm/readahead.c:299 [inline]
page_cache_ra_order+0x7b7/0xa70 mm/readahead.c:544
do_sync_mmap_readahead mm/filemap.c:3153 [inline]
filemap_fault+0x16a7/0x3570 mm/filemap.c:3245
__do_fault+0x10a/0x4a0 mm/memory.c:4396
do_read_fault mm/memory.c:4758 [inline]
do_fault mm/memory.c:4888 [inline]
do_pte_missing mm/memory.c:3745 [inline]
handle_pte_fault mm/memory.c:5164 [inline]
__handle_mm_fault+0x32c2/0x4920 mm/memory.c:5305
handle_mm_fault+0x476/0xa00 mm/memory.c:5470
do_user_addr_fault+0x2e5/0x1080 arch/x86/mm/fault.c:1413
handle_page_fault arch/x86/mm/fault.c:1505 [inline]
exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1563
asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0010:do_strncpy_from_user lib/strncpy_from_user.c:41 [inline]
RIP: 0010:strncpy_from_user+0x164/0x300 lib/strncpy_from_user.c:139
Code: 00 48 83 ed 08 4d 89 64 1d 00 bf 07 00 00 00 48 83 c3 08 48 89 ee e8 4b 2b e4 fc 48 83 fd 07 0f 86 ca 00 00 00 e8 2c 30 e4 fc <4d> 8b 24 1e e8 23 30 e4 fc 48 b8 ff fe fe fe fe fe fe fe 4c 89 e2
RSP: 0018:ffffc90003aafd10 EFLAGS: 00050287
RAX: 00000000000003a9 RBX: 0000000000000000 RCX: ffffc9000a512000
RDX: 0000000000040000 RSI: ffffffff84a8c884 RDI: 0000000000000007
RBP: 0000000000000fe0 R08: 0000000000000007 R09: 0000000000000007
R10: 0000000000000fe0 R11: 0000000000000000 R12: 0000000020001060
R13: ffff88802b9bc420 R14: 0000000020000080 R15: 0000000000000fe0
getname_flags.part.0+0x93/0x4f0 fs/namei.c:150
getname_flags include/linux/audit.h:322 [inline]
getname+0x8f/0xe0 fs/namei.c:218
do_sys_openat2+0x104/0x1e0 fs/open.c:1400
do_sys_open fs/open.c:1421 [inline]
__do_sys_openat fs/open.c:1437 [inline]
__se_sys_openat fs/open.c:1432 [inline]
__x64_sys_openat+0x175/0x210 fs/open.c:1432
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xd2/0x260 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x6d/0x75
RIP: 0033:0x7f761d47de69
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f761e1c00c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f761d5ac050 RCX: 00007f761d47de69
RDX: 00000000000026e1 RSI: 0000000020000080 RDI: ffffffffffffff9c
RBP: 00007f761d4ca47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000006e R14: 00007f761d5ac050 R15: 00007ffdc4f01d78