INFO: task syz.0.17:5979 blocked for more than 143 seconds.
Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.17 state:D stack:29040 pid:5979 ppid:5932 flags:0x00004004
Call Trace:
<TASK>
context_switch kernel/sched/core.c:5380 [inline]
__schedule+0x14d2/0x44d0 kernel/sched/core.c:6699
schedule+0xbd/0x170 kernel/sched/core.c:6773
schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6832
rwsem_down_read_slowpath+0x4f8/0x840 kernel/locking/rwsem.c:1086
__down_read_common kernel/locking/rwsem.c:1250 [inline]
__down_read kernel/locking/rwsem.c:1263 [inline]
down_read+0x98/0x2e0 kernel/locking/rwsem.c:1522
inode_lock_shared include/linux/fs.h:814 [inline]
lookup_slow+0x46/0x70 fs/namei.c:1710
walk_component+0x2be/0x3f0 fs/namei.c:2002
lookup_last fs/namei.c:2459 [inline]
path_lookupat+0x169/0x440 fs/namei.c:2483
filename_lookup+0x1f4/0x510 fs/namei.c:2512
user_path_at_empty+0x42/0x60 fs/namei.c:2909
user_path_at include/linux/namei.h:57 [inline]
do_mount fs/namespace.c:3714 [inline]
__do_sys_mount fs/namespace.c:3926 [inline]
__se_sys_mount+0x29b/0x3c0 fs/namespace.c:3903
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f612e58eba9
RSP: 002b:00007f612f3e5038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f612e7d6090 RCX: 00007f612e58eba9
RDX: 0000000000000000 RSI: 00002000000000c0 RDI: 0000000000000000
RBP: 00007f612e611e19 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000020040c1 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f612e7d6128 R14: 00007f612e7d6090 R15: 00007fff85b269a8
</TASK>
Showing all locks held in the system:
1 lock held by khungtaskd/29:
#0: ffffffff8cd2fe20 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:334 [inline]
#0: ffffffff8cd2fe20 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:786 [inline]
#0: ffffffff8cd2fe20 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x290 kernel/locking/lockdep.c:6633
1 lock held by kswapd0/85:
4 locks held by kworker/u4:7/2939:
2 locks held by getty/5554:
#0: ffff88802cc520a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc9000327b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x425/0x1380 drivers/tty/n_tty.c:2217
2 locks held by syz.0.17/5978:
1 lock held by syz.0.17/5979:
#0: ffff88805de28198 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:814 [inline]
#0: ffff88805de28198 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1710
1 lock held by syz.2.19/6040:
1 lock held by syz.2.19/6041:
#0: ffff88805de286e0 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:814 [inline]
#0: ffff88805de286e0 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1710
1 lock held by syz.3.20/6043:
1 lock held by syz.3.20/6044:
#0: ffff88805a804198 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:814 [inline]
#0: ffff88805a804198 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1710
1 lock held by syz.1.18/6046:
1 lock held by syz.1.18/6047:
#0: ffff88805de28c28 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:814 [inline]
#0: ffff88805de28c28 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1710
1 lock held by syz.4.21/6081:
1 lock held by syz.4.21/6083:
#0: ffff88805a8046e0 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:814 [inline]
#0: ffff88805a8046e0 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1710
1 lock held by syz.5.22/6175:
1 lock held by syz.5.22/6176:
#0: ffff88805a804c28 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:814 [inline]
#0: ffff88805a804c28 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1710
1 lock held by syz.7.24/6182:
1 lock held by syz.7.24/6183:
#0: ffff88805de29170 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:814 [inline]
#0: ffff88805de29170 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1710
1 lock held by syz.6.23/6191:
1 lock held by syz.6.23/6192:
#0: ffff88805de296b8 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:814 [inline]
#0: ffff88805de296b8 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1710
2 locks held by syz.8.25/6208:
1 lock held by syz.8.25/6210:
#0: ffff88805de29c00 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:814 [inline]
#0: ffff88805de29c00 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1710
1 lock held by syz-executor/6251:
1 lock held by syz.9.26/6271:
1 lock held by syz.9.26/6272:
#0: ffff88805de2a148 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: inode_lock_shared include/linux/fs.h:814 [inline]
#0: ffff88805de2a148 (&type->i_mutex_dir_key#8){++++}-{3:3}, at: lookup_slow+0x46/0x70 fs/namei.c:1710
2 locks held by syz.0.132/6648:
1 lock held by syz.1.134/6646:
#0: ffff8880b8f3c458 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:558
1 lock held by syz.2.133/6647:
3 locks held by modprobe/6650:
1 lock held by modprobe/6652:
=============================================
NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
<TASK>
dump_stack_lvl+0x16c/0x230 lib/dump_stack.c:106
nmi_cpu_backtrace+0x39b/0x3d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x2f0 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+0xf41/0xf80 kernel/hung_task.c:379
kthread+0x2fa/0x390 kernel/kthread.c:388
ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152
ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293
</TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 6081 Comm: syz.4.21 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:check_region_inline mm/kasan/generic.c:169 [inline]
RIP: 0010:kasan_check_range+0x12/0x290 mm/kasan/generic.c:187
Code: 0f 0b b8 ea ff ff ff c3 0f 0b b8 ea ff ff ff c3 cc cc cc cc cc cc cc cc 66 0f 1f 00 b0 01 48 85 f6 0f 84 b8 01 00 00 55 41 57 <41> 56 41 55 41 54 53 4c 8d 04 37 49 39 f8 0f 82 5a 02 00 00 49 89
RSP: 0018:ffffc900043b6038 EFLAGS: 00000002
RAX: ffff88815c284d01 RBX: 0000000000000002 RCX: ffffffff8a60dee4
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff88815c284ff8
RBP: 000000000000000c R08: ffff88815c284ff7 R09: 1ffff1102b8509fe
R10: dffffc0000000000 R11: ffffed102b8509ff R12: 000000000000000c
R13: dffffc0000000000 R14: ffff88815c284dc0 R15: 0000000000000002
FS: 00007f146ca236c0(0000) GS:ffff8880b8e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd8e6113000 CR3: 0000000076974000 CR4: 00000000003506f0
Call Trace:
<TASK>
instrument_read_write include/linux/instrumented.h:54 [inline]
__instrument_read_write_bitop include/asm-generic/bitops/instrumented-non-atomic.h:84 [inline]
___test_and_clear_bit include/asm-generic/bitops/instrumented-non-atomic.h:114 [inline]
node_clear_mark lib/xarray.c:102 [inline]
xas_clear_mark+0x104/0x520 lib/xarray.c:914
page_cache_delete mm/filemap.c:143 [inline]
__filemap_remove_folio+0x457/0x7f0 mm/filemap.c:225
__remove_mapping+0x8cd/0x13a0 mm/vmscan.c:1464
shrink_folio_list+0x2883/0x7980 mm/vmscan.c:2109
evict_folios+0xa85/0x2290 mm/vmscan.c:5208
try_to_shrink_lruvec+0x856/0xb80 mm/vmscan.c:5409
lru_gen_shrink_lruvec mm/vmscan.c:5553 [inline]
shrink_lruvec+0x4ce/0x28b0 mm/vmscan.c:6303
shrink_node_memcgs mm/vmscan.c:6523 [inline]
shrink_node+0x920/0x3790 mm/vmscan.c:6558
shrink_zones mm/vmscan.c:6800 [inline]
do_try_to_free_pages+0x65f/0x1aa0 mm/vmscan.c:6862
try_to_free_mem_cgroup_pages+0x2f5/0x790 mm/vmscan.c:7177
try_charge_memcg+0x61c/0x1810 mm/memcontrol.c:2694
try_charge mm/memcontrol.c:2836 [inline]
charge_memcg+0x117/0x380 mm/memcontrol.c:7048
__mem_cgroup_charge+0x25/0x80 mm/memcontrol.c:7069
mem_cgroup_charge include/linux/memcontrol.h:686 [inline]
__filemap_add_folio+0xb42/0x17a0 mm/filemap.c:859
filemap_add_folio+0xae/0x3c0 mm/filemap.c:967
do_read_cache_folio+0x38a/0x7e0 mm/filemap.c:3756
do_read_cache_page+0x32/0x250 mm/filemap.c:3855
read_mapping_page include/linux/pagemap.h:892 [inline]
dir_get_page fs/sysv/dir.c:64 [inline]
sysv_find_entry+0x196/0x3f0 fs/sysv/dir.c:157
sysv_inode_by_name+0x31/0x140 fs/sysv/dir.c:374
sysv_lookup+0x6a/0xe0 fs/sysv/namei.c:38
lookup_open fs/namei.c:3466 [inline]
open_last_lookups fs/namei.c:3556 [inline]
path_openat+0x10b8/0x3190 fs/namei.c:3786
do_filp_open+0x1c5/0x3d0 fs/namei.c:3816
do_sys_openat2+0x12c/0x1c0 fs/open.c:1419
do_sys_open fs/open.c:1434 [inline]
__do_sys_openat fs/open.c:1450 [inline]
__se_sys_openat fs/open.c:1445 [inline]
__x64_sys_openat+0x139/0x160 fs/open.c:1445
do_syscall_x64 arch/x86/entry/common.c:51 [inline]
do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:81
entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f146bb8eba9
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:00007f146ca23038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 00007f146bdd5fa0 RCX: 00007f146bb8eba9
RDX: 0000000000000040 RSI: 0000200000000100 RDI: ffffffffffffff9c
RBP: 00007f146bc11e19 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000000001ff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f146bdd6038 R14: 00007f146bdd5fa0 R15: 00007ffefc3132e8
</TASK>