INFO: task syz.8.593:9075 blocked for more than 144 seconds.
Not tainted 6.12.0-next-20241122-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.8.593 state:D stack:25920 pid:9075 tgid:9066 ppid:7722 flags:0x00000004
Call Trace:
context_switch kernel/sched/core.c:5369 [inline]
__schedule+0x1850/0x4c30 kernel/sched/core.c:6756
__schedule_loop kernel/sched/core.c:6833 [inline]
schedule+0x14b/0x320 kernel/sched/core.c:6848
d_wait_lookup fs/dcache.c:2477 [inline]
d_alloc_parallel+0xc16/0x1600 fs/dcache.c:2559
__lookup_slow+0x117/0x3f0 fs/namei.c:1776
lookup_slow+0x53/0x70 fs/namei.c:1808
walk_component+0x2e1/0x410 fs/namei.c:2112
lookup_last fs/namei.c:2610 [inline]
path_lookupat+0x16f/0x450 fs/namei.c:2634
filename_lookup+0x2a3/0x670 fs/namei.c:2663
user_path_at+0x3a/0x60 fs/namei.c:3070
do_fchownat+0xed/0x240 fs/open.c:803
__do_sys_lchown fs/open.c:834 [inline]
__se_sys_lchown fs/open.c:832 [inline]
__x64_sys_lchown+0x85/0xa0 fs/open.c:832
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efd1217e819
RSP: 002b:00007efd13035038 EFLAGS: 00000246 ORIG_RAX: 000000000000005e
RAX: ffffffffffffffda RBX: 00007efd12336080 RCX: 00007efd1217e819
RDX: 000000000000ee00 RSI: 0000000000000000 RDI: 0000000020000240
RBP: 00007efd121f175e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007efd12336080 R15: 00007ffcb7405e08
Showing all locks held in the system:
1 lock held by pool_workqueue_/3:
#0: ffffffff8e93cff8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:329 [inline]
#0: ffffffff8e93cff8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:976
1 lock held by khungtaskd/30:
#0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6744
3 locks held by kworker/u8:2/35:
4 locks held by kworker/u8:6/1110:
#0: ffff88801baed948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline]
#0: ffff88801baed948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310
#1: ffffc9000406fd00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
#1: ffffc9000406fd00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310
#2: ffffffff8fc94910 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0x16a/0xcc0 net/core/net_namespace.c:586
#3: ffffffff8fca0d88 (rtnl_mutex){+.+.}-{4:4}, at: ieee80211_unregister_hw+0x55/0x2c0 net/mac80211/main.c:1664
2 locks held by getty/5585:
#0: ffff888031db90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
#1: ffffc900032fb2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
3 locks held by kworker/u8:13/7015:
#0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline]
#0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310
#1: ffffc90002e17d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline]
#1: ffffc90002e17d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310
#2: ffffffff8fca0d88 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:276
1 lock held by syz.8.593/9075:
#0: ffff888050dd0180 (&type->i_mutex_dir_key#25){.+.+}-{4:4}, at: inode_lock_shared include/linux/fs.h:828 [inline]
#0: ffff888050dd0180 (&type->i_mutex_dir_key#25){.+.+}-{4:4}, at: lookup_slow+0x45/0x70 fs/namei.c:1807
1 lock held by syz.8.593/9076:
1 lock held by syz-executor/9818:
#0: ffffffff8e93cff8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:329 [inline]
#0: ffffffff8e93cff8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:976
3 locks held by syz-executor/10202:
#0: ffffffff901a7c70 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff901a7c70 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff901a7c70 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x22/0x250 net/core/rtnetlink.c:555
#1: ffffffff8fca0d88 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
#1: ffffffff8fca0d88 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:326 [inline]
#1: ffffffff8fca0d88 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xd04/0x24f0 net/core/rtnetlink.c:4000
#2: ffffffff8e93cff8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:329 [inline]
#2: ffffffff8e93cff8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:976
2 locks held by syz.3.846/10317:
#0: ffffffff90189750 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
#0: ffffffff90189750 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
#0: ffffffff90189750 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x22/0x250 net/core/rtnetlink.c:555
#1: ffffffff8fca0d88 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:79 [inline]
#1: ffffffff8fca0d88 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:326 [inline]
#1: ffffffff8fca0d88 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xd04/0x24f0 net/core/rtnetlink.c:4000
1 lock held by syz.1.845/10322:
=============================================
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-next-20241122-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
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:162 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:234 [inline]
watchdog+0xffb/0x1040 kernel/hung_task.c:397
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 9076 Comm: syz.8.593 Not tainted 6.12.0-next-20241122-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:variable_test_bit arch/x86/include/asm/bitops.h:227 [inline]
RIP: 0010:arch_test_bit arch/x86/include/asm/bitops.h:239 [inline]
RIP: 0010:_test_bit include/asm-generic/bitops/instrumented-non-atomic.h:142 [inline]
RIP: 0010:cpumask_test_cpu include/linux/cpumask.h:570 [inline]
RIP: 0010:cpu_online include/linux/cpumask.h:1117 [inline]
RIP: 0010:trace_lock_acquire include/trace/events/lock.h:24 [inline]
RIP: 0010:lock_acquire+0xd4/0x550 kernel/locking/lockdep.c:5820
Code: 8b 05 6c 2b 89 7e 83 f8 08 0f 83 f4 02 00 00 89 c3 48 89 d8 48 c1 e8 06 48 8d 3c c5 30 5f 18 90 be 08 00 00 00 e8 9c c2 8f 00 <48> 0f a3 1d 64 b4 9d 0e 73 16 e8 2d 60 0a 00 84 c0 75 0d 80 3d 6c
RSP: 0018:ffffc90003caf180 EFLAGS: 00000056
RAX: 0000000000000001 RBX: 0000000000000001 RCX: ffffffff817aaac4
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff90185f30
RBP: ffffc90003caf2c8 R08: ffffffff90185f37 R09: 1ffffffff2030be6
R10: dffffc0000000000 R11: fffffbfff2030be7 R12: 1ffff92000795e38
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000246
FS: 00007efd130146c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31805ff8 CR3: 000000006996e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
local_lock_acquire include/linux/local_lock_internal.h:29 [inline]
mod_objcg_state+0x142/0x930 mm/memcontrol.c:2712
__memcg_slab_post_alloc_hook+0x20f/0x7e0 mm/memcontrol.c:3013
memcg_slab_post_alloc_hook mm/slub.c:2152 [inline]
slab_post_alloc_hook mm/slub.c:4114 [inline]
slab_alloc_node mm/slub.c:4153 [inline]
kmem_cache_alloc_noprof+0x287/0x380 mm/slub.c:4160
alloc_buffer_head+0x2a/0x290 fs/buffer.c:3015
folio_alloc_buffers+0x2bc/0x660 fs/buffer.c:924
create_empty_buffers+0x3a/0x740 fs/buffer.c:1662
block_read_full_folio+0x25c/0xcd0 fs/buffer.c:2377
filemap_read_folio+0x14b/0x630 mm/filemap.c:2366
do_read_cache_folio+0x3f5/0x850 mm/filemap.c:3826
read_mapping_folio include/linux/pagemap.h:1011 [inline]
dir_get_folio fs/sysv/dir.c:64 [inline]
sysv_find_entry+0x16a/0x4b0 fs/sysv/dir.c:154
sysv_inode_by_name+0x98/0x2a0 fs/sysv/dir.c:370
sysv_lookup+0x6b/0xe0 fs/sysv/namei.c:38
__lookup_slow+0x28c/0x3f0 fs/namei.c:1791
lookup_slow+0x53/0x70 fs/namei.c:1808
walk_component+0x2e1/0x410 fs/namei.c:2112
lookup_last fs/namei.c:2610 [inline]
path_lookupat+0x16f/0x450 fs/namei.c:2634
filename_lookup+0x2a3/0x670 fs/namei.c:2663
user_path_at+0x3a/0x60 fs/namei.c:3070
do_fchownat+0xed/0x240 fs/open.c:803
__do_sys_lchown fs/open.c:834 [inline]
__se_sys_lchown fs/open.c:832 [inline]
__x64_sys_lchown+0x85/0xa0 fs/open.c:832
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efd1217e819
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:00007efd13014038 EFLAGS: 00000246 ORIG_RAX: 000000000000005e
RAX: ffffffffffffffda RBX: 00007efd12336160 RCX: 00007efd1217e819
RDX: 000000000000ee00 RSI: 0000000000000000 RDI: 0000000020000240
RBP: 00007efd121f175e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007efd12336160 R15: 00007ffcb7405e08