INFO: task syz.6.1882:15922 blocked for more than 143 seconds.
Tainted: G L syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.6.1882 state:D stack:25048 pid:15922 tgid:15922 ppid:15913 task_flags:0x400640 flags:0x00080002
Call Trace:
context_switch kernel/sched/core.c:5388 [inline]
__schedule+0x1821/0x5740 kernel/sched/core.c:7189
__schedule_loop kernel/sched/core.c:7268 [inline]
schedule+0x164/0x360 kernel/sched/core.c:7283
schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7340
rwsem_down_read_slowpath+0x6d9/0x940 kernel/locking/rwsem.c:1114
__down_read_common kernel/locking/rwsem.c:1291 [inline]
__down_read kernel/locking/rwsem.c:1304 [inline]
down_read+0x99/0x2e0 kernel/locking/rwsem.c:1570
nilfs_transaction_begin+0x364/0x710 fs/nilfs2/segment.c:221
nilfs_create+0xd7/0x310 fs/nilfs2/namei.c:95
lookup_open fs/namei.c:4511 [inline]
open_last_lookups fs/namei.c:4611 [inline]
path_openat+0x1395/0x3860 fs/namei.c:4855
do_file_open+0x23e/0x4a0 fs/namei.c:4887
file_open_name fs/open.c:1322 [inline]
filp_open+0x16d/0x1d0 fs/open.c:1339
coredump_file fs/coredump.c:935 [inline]
do_coredump fs/coredump.c:1105 [inline]
vfs_coredump+0x1fc0/0x4530 fs/coredump.c:1206
get_signal+0x1107/0x1330 kernel/signal.c:3022
arch_do_signal_or_restart+0xbc/0x840 arch/x86/kernel/signal.c:337
__exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
exit_to_user_mode_loop kernel/entry/common.c:98 [inline]
__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:244 [inline]
irqentry_exit_to_user_mode include/linux/irq-entry-common.h:315 [inline]
irqentry_exit+0x2aa/0x8b0 kernel/entry/common.c:162
exc_general_protection+0x16b/0x1f0 arch/x86/kernel/traps.c:914
asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:612
RIP: 0033:0x7ff4a3f9ce61
RSP: 002b:0000200000000480 EFLAGS: 00010217
RAX: 0000000000000000 RBX: 00007ff4a4216180 RCX: 00007ff4a3f9ce59
RDX: 0000000000000000 RSI: 0000200000000480 RDI: 0000000002000000
RBP: 00007ff4a4032d6f R08: 00002000000007c0 R09: 00002000000007c0
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007ff4a4216218 R14: 00007ff4a4216180 R15: 00007ffc88389548
Showing all locks held in the system:
2 locks held by kworker/u8:1/13:
#0: ffff8880b863aee0 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xb6/0x150 kernel/sched/core.c:660
#1: ffff8880b8624588 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880 kernel/sched/psi.c:933
1 lock held by khungtaskd/32:
#0: ffffffff8e95cc20 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
#0: ffffffff8e95cc20 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
#0: ffffffff8e95cc20 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
3 locks held by kworker/u8:3/49:
#0: ffff8880326fd940 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3289 [inline]
#0: ffff8880326fd940 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860 kernel/workqueue.c:3397
#1: ffffc90000b97c40 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3290 [inline]
#1: ffffc90000b97c40 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860 kernel/workqueue.c:3397
#2: ffffffff8fdc8480 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:130 [inline]
#2: ffffffff8fdc8480 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x11e/0x14c0 net/ipv6/addrconf.c:4206
2 locks held by getty/5384:
#0: ffff88803714f0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900032332e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0 drivers/tty/n_tty.c:2211
3 locks held by kworker/0:5/5771:
#0: ffff888022a83140 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3289 [inline]
#0: ffff888022a83140 ((wq_completion)usb_hub_wq){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860 kernel/workqueue.c:3397
#1: ffffc90004defc40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3290 [inline]
#1: ffffc90004defc40 ((work_completion)(&hub->events)){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860 kernel/workqueue.c:3397
#2: ffff88802a4901d8 (&dev->mutex){....}-{4:4}, at: device_lock include/linux/device.h:1040 [inline]
#2: ffff88802a4901d8 (&dev->mutex){....}-{4:4}, at: hub_event+0x17f/0x4f30 drivers/usb/core/hub.c:5899
4 locks held by syz.6.1882/15913:
4 locks held by syz.6.1882/15922:
#0: ffff888078a96410 (sb_writers#26){.+.+}-{0:0}, at: mnt_want_write+0x41/0x90 fs/namespace.c:493
#1: ffff888052b74b50 (&type->i_mutex_dir_key#15){++++}-{4:4}, at: inode_lock include/linux/fs.h:1029 [inline]
#1: ffff888052b74b50 (&type->i_mutex_dir_key#15){++++}-{4:4}, at: open_last_lookups fs/namei.c:4608 [inline]
#1: ffff888052b74b50 (&type->i_mutex_dir_key#15){++++}-{4:4}, at: path_openat+0xb4c/0x3860 fs/namei.c:4855
#2: ffff888078a96600 (sb_internal#5){.+.+}-{0:0}, at: nilfs_create+0xd7/0x310 fs/nilfs2/namei.c:95
#3: ffff88802972d288 (&nilfs->ns_segctor_sem){++++}-{4:4}, at: nilfs_transaction_begin+0x364/0x710 fs/nilfs2/segment.c:221
3 locks held by syz-executor/17178:
#0: ffffffff8fdc8480 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:80 [inline]
#0: ffffffff8fdc8480 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:341 [inline]
#0: ffffffff8fdc8480 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x883/0x1bb0 net/core/rtnetlink.c:4109
#1: ffff888050351590 (&wg->device_update_lock){+.+.}-{4:4}, at: wg_open+0x227/0x420 drivers/net/wireguard/device.c:50
#2: ffffffff8e962f28 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline]
#2: ffffffff8e962f28 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2d0/0x770 kernel/rcu/tree_exp.h:961
1 lock held by sed/17774:
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 32 Comm: khungtaskd Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Call Trace:
dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline]
__sys_info lib/sys_info.c:157 [inline]
sys_info+0x135/0x170 lib/sys_info.c:165
check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
watchdog+0xfd3/0x1030 kernel/hung_task.c:561
kthread+0x389/0x470 kernel/kthread.c:436
ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
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: 15913 Comm: syz.6.1882 Tainted: G L syzkaller #0 PREEMPT(full)
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:rcu_read_unlock include/linux/rcupdate.h:867 [inline]
RIP: 0010:class_rcu_destructor include/linux/rcupdate.h:1181 [inline]
RIP: 0010:unwind_next_frame+0x1b76/0x2550 arch/x86/kernel/unwind_orc.c:709
Code: 4c 8b 6c 24 20 41 0f b6 44 2d 00 84 c0 0f 85 81 02 00 00 41 c7 06 00 00 00 00 31 db e8 83 5d 30 0a 85 c0 74 3a e8 ca cf 33 00 <84> c0 75 31 e8 71 5d 30 0a 85 c0 74 28 80 3d 1c 1b a3 0e 00 75 1f
RSP: 0018:ffffc90005505598 EFLAGS: 00000212
RAX: 0000000000000001 RBX: ffffffff90d2e901 RCX: 0000000080000001
RDX: ffffc90005505601 RSI: ffffffff8c28b740 RDI: ffffffff8c28b700
RBP: dffffc0000000000 R08: ffffc90005507108 R09: ffffc900055056b8
R10: dffffc0000000000 R11: fffff52000aa0ad9 R12: ffffc90005507118
R13: ffffc90005500000 R14: ffffc90005505668 R15: ffffffff8176e256
FS: 00007ff4a4ec36c0(0000) GS:ffff88812529c000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f84cf9667d0 CR3: 000000007e011000 CR4: 0000000000350ef0
Call Trace:
arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25
stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:57 [inline]
kasan_save_track+0x3e/0x80 mm/kasan/common.c:78
kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:584
poison_slab_object mm/kasan/common.c:253 [inline]
__kasan_slab_free+0x5c/0x80 mm/kasan/common.c:285
kasan_slab_free include/linux/kasan.h:235 [inline]
slab_free_hook mm/slub.c:2689 [inline]
slab_free mm/slub.c:6251 [inline]
kmem_cache_free+0x182/0x650 mm/slub.c:6378
free_buffer_head+0x55/0x220 fs/buffer.c:2957
try_to_free_buffers+0x25b/0x300 fs/buffer.c:2898
shrink_folio_list+0x2249/0x52a0 mm/vmscan.c:1466
evict_folios+0x4998/0x5ac0 mm/vmscan.c:4854
try_to_shrink_lruvec+0xbca/0x1050 mm/vmscan.c:5009
lru_gen_shrink_lruvec mm/vmscan.c:5173 [inline]
shrink_lruvec+0x546/0x2b90 mm/vmscan.c:5932
shrink_node_memcgs mm/vmscan.c:6171 [inline]
shrink_node+0xa4a/0x3ae0 mm/vmscan.c:6215
shrink_zones mm/vmscan.c:6454 [inline]
do_try_to_free_pages+0x6a2/0x1990 mm/vmscan.c:6516
try_to_free_mem_cgroup_pages+0x2ff/0x810 mm/vmscan.c:6838
try_charge_memcg+0x80c/0x1570 mm/memcontrol.c:2627
charge_memcg+0x1a2/0x2b0 mm/memcontrol.c:5021
__mem_cgroup_charge+0x25/0x80 mm/memcontrol.c:5038
mem_cgroup_charge include/linux/memcontrol.h:644 [inline]
filemap_add_folio+0x152/0x530 mm/filemap.c:960
__filemap_get_folio_mpol+0x500/0xb00 mm/filemap.c:2022
__filemap_get_folio include/linux/pagemap.h:763 [inline]
filemap_grab_folio include/linux/pagemap.h:843 [inline]
nilfs_grab_buffer+0xae/0x490 fs/nilfs2/page.c:56
nilfs_mdt_submit_block+0xb5/0x840 fs/nilfs2/mdt.c:123
nilfs_mdt_read_block+0x46/0x320 fs/nilfs2/mdt.c:178
nilfs_mdt_get_block+0x13f/0xb00 fs/nilfs2/mdt.c:254
nilfs_cpfile_get_checkpoint_block fs/nilfs2/cpfile.c:181 [inline]
nilfs_cpfile_delete_checkpoints+0x2b2/0xce0 fs/nilfs2/cpfile.c:487
nilfs_ioctl_delete_checkpoints fs/nilfs2/ioctl.c:680 [inline]
nilfs_ioctl_prepare_clean_segments+0x158/0x840 fs/nilfs2/ioctl.c:787
nilfs_clean_segments+0x18c/0xa50 fs/nilfs2/segment.c:2525
nilfs_ioctl_clean_segments fs/nilfs2/ioctl.c:922 [inline]
nilfs_ioctl+0x261f/0x2780 fs/nilfs2/ioctl.c:1352
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:597 [inline]
__se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7ff4a3f9ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff4a4ec3028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ff4a4215fa0 RCX: 00007ff4a3f9ce59
RDX: 0000200000000640 RSI: 0000000040786e88 RDI: 0000000000000005
RBP: 00007ff4a4032d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ff4a4216038 R14: 00007ff4a4215fa0 R15: 00007ffc88389548