INFO: task syz.4.848:7502 blocked for more than 148 seconds.
Not tainted 5.15.179-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.848 state:D stack:25088 pid: 7502 ppid: 4175 flags:0x00004006
Call Trace:
context_switch kernel/sched/core.c:5029 [inline]
__schedule+0x12c4/0x45b0 kernel/sched/core.c:6375
schedule+0x11b/0x1f0 kernel/sched/core.c:6458
schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6517
rwsem_down_read_slowpath+0x605/0xb40 kernel/locking/rwsem.c:1055
__down_read_common kernel/locking/rwsem.c:1239 [inline]
__down_read kernel/locking/rwsem.c:1252 [inline]
down_read+0x9a/0x2e0 kernel/locking/rwsem.c:1500
iterate_supers+0xac/0x1e0 fs/super.c:716
drop_caches_sysctl_handler+0x83/0x160 fs/drop_caches.c:62
proc_sys_call_handler+0x541/0x8a0 fs/proc/proc_sysctl.c:588
do_iter_readv_writev+0x594/0x7a0
do_iter_write+0x1e6/0x760 fs/read_write.c:855
vfs_writev fs/read_write.c:928 [inline]
do_writev+0x281/0x470 fs/read_write.c:971
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f662281d169
RSP: 002b:00007f6620686038 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
RAX: ffffffffffffffda RBX: 00007f6622a35fa0 RCX: 00007f662281d169
RDX: 0000000000000001 RSI: 0000400000000080 RDI: 0000000000000003
RBP: 00007f662289e2a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f6622a35fa0 R15: 00007ffec5116598
Showing all locks held in the system:
3 locks held by kworker/0:0/7:
#0: ffff888017470938 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283
#1: ffff8880b8e27848 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x53d/0x810 kernel/sched/psi.c:891
#2: ffff8880b8e29158 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x120/0x260 kernel/time/timer.c:946
5 locks held by ksoftirqd/1/20:
1 lock held by khungtaskd/27:
#0: ffffffff8cb1f4e0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
3 locks held by kworker/u4:3/518:
2 locks held by getty/3930:
#0: ffff88802c105098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
#1: ffffc900026362e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6af/0x1db0 drivers/tty/n_tty.c:2158
1 lock held by syz-executor/4170:
#0: ffff8880630c80e0 (&type->s_umount_key#51){++++}-{3:3}, at: deactivate_super+0xa9/0xe0 fs/super.c:365
2 locks held by kworker/1:8/5165:
#0: ffff888017472138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x78a/0x10c0 kernel/workqueue.c:2283
#1: ffffc900014efd20 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x7d0/0x10c0 kernel/workqueue.c:2285
3 locks held by syz.4.848/7502:
#0: ffff8880513aa5f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2cb/0x380 fs/file.c:1058
#1: ffff88807a828460 (sb_writers#4){.+.+}-{0:0}, at: vfs_writev fs/read_write.c:927 [inline]
#1: ffff88807a828460 (sb_writers#4){.+.+}-{0:0}, at: do_writev+0x26d/0x470 fs/read_write.c:971
#2: ffff8880630c80e0 (&type->s_umount_key#51){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:716
3 locks held by syz.5.1111/8426:
#0: ffff88807e4745f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x2cb/0x380 fs/file.c:1058
#1: ffff88806025c460 (sb_writers#4){.+.+}-{0:0}, at: vfs_writev fs/read_write.c:927 [inline]
#1: ffff88806025c460 (sb_writers#4){.+.+}-{0:0}, at: do_writev+0x26d/0x470 fs/read_write.c:971
#2: ffff8880630c80e0 (&type->s_umount_key#51){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:716
1 lock held by syz.9.1191/8730:
#0: ffff8880630c80e0 (&type->s_umount_key#51){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:716
2 locks held by syz.2.1193/8734:
#0: ffff88807d300460 (sb_writers#4){.+.+}-{0:0}, at: vfs_writev fs/read_write.c:927 [inline]
#0: ffff88807d300460 (sb_writers#4){.+.+}-{0:0}, at: do_pwritev+0x1fd/0x360 fs/read_write.c:1025
#1: ffff8880630c80e0 (&type->s_umount_key#51){++++}-{3:3}, at: iterate_supers+0xac/0x1e0 fs/super.c:716
1 lock held by syz-executor/8826:
#0: ffffffff8dc43ac8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
#0: ffffffff8dc43ac8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x956/0xef0 net/core/rtnetlink.c:5644
2 locks held by syz-executor/8828:
#0: ffffffff8dc43ac8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline]
#0: ffffffff8dc43ac8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x956/0xef0 net/core/rtnetlink.c:5644
#1: ffffffff8cb23aa8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline]
#1: ffffffff8cb23aa8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x280/0x740 kernel/rcu/tree_exp.h:845
=============================================
NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.179-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106
nmi_cpu_backtrace+0x46a/0x4a0 lib/nmi_backtrace.c:111
nmi_trigger_cpumask_backtrace+0x181/0x2a0 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:148 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:212 [inline]
watchdog+0xe72/0xeb0 kernel/hung_task.c:369
kthread+0x3f6/0x4f0 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 20 Comm: ksoftirqd/1 Not tainted 5.15.179-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:stack_trace_consume_entry+0x11/0x270 kernel/stacktrace.c:83
Code: ff 48 89 df e8 60 61 5c 00 e9 6e ff ff ff e8 96 d1 d1 08 66 0f 1f 44 00 00 55 41 57 41 56 41 55 41 54 53 48 83 ec 18 48 89 fb <48> ba 00 00 00 00 00 fc ff df 4c 8d 4f 10 4d 89 cf 49 c1 ef 03 41
RSP: 0018:ffffc90000da63f0 EFLAGS: 00000286
RAX: ffffffff8856a837 RBX: ffffc90000da6520 RCX: 0000000080000500
RDX: dffffc0000000000 RSI: ffffffff8856a837 RDI: ffffc90000da6520
RBP: ffffc90000da64d0 R08: ffffc90000da6a28 R09: ffffc90000da6490
R10: 0000000000000000 R11: dffffc0000000001 R12: ffff88813fe28000
R13: ffffffff816e2db0 R14: ffffc90000da6520 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b33518ff8 CR3: 00000000489b9000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
arch_stack_walk+0x101/0x140 arch/x86/kernel/stacktrace.c:27
stack_trace_save+0x113/0x1c0 kernel/stacktrace.c:122
kasan_save_stack mm/kasan/common.c:38 [inline]
kasan_set_track+0x4b/0x80 mm/kasan/common.c:46
kasan_set_free_info+0x1f/0x40 mm/kasan/generic.c:360
____kasan_slab_free+0xd8/0x120 mm/kasan/common.c:366
kasan_slab_free include/linux/kasan.h:230 [inline]
slab_free_hook mm/slub.c:1705 [inline]
slab_free_freelist_hook+0xdd/0x160 mm/slub.c:1731
slab_free mm/slub.c:3499 [inline]
kmem_cache_free+0x91/0x1f0 mm/slub.c:3515
packet_rcv+0x15d/0x11b0 net/packet/af_packet.c:2243
dev_queue_xmit_nit+0x9bb/0xae0 net/core/dev.c:2373
xmit_one net/core/dev.c:3643 [inline]
dev_hard_start_xmit+0x137/0x7a0 net/core/dev.c:3664
__dev_queue_xmit+0x1c8e/0x32b0 net/core/dev.c:4287
neigh_hh_output include/net/neighbour.h:493 [inline]
neigh_output include/net/neighbour.h:507 [inline]
ip_finish_output2+0xcd7/0x11a0 net/ipv4/ip_output.c:228
synproxy_send_client_synack+0x8b4/0xf20 net/netfilter/nf_synproxy_core.c:506
nft_synproxy_eval_v4+0x3c6/0x610 net/netfilter/nft_synproxy.c:59
nft_synproxy_do_eval+0x359/0xa60 net/netfilter/nft_synproxy.c:141
expr_call_ops_eval net/netfilter/nf_tables_core.c:198 [inline]
nft_do_chain+0x467/0x16b0 net/netfilter/nf_tables_core.c:238
nft_do_chain_inet+0x3f8/0x680 net/netfilter/nft_chain_filter.c:161
nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
nf_hook_slow+0xae/0x1e0 net/netfilter/core.c:584
nf_hook include/linux/netfilter.h:257 [inline]
NF_HOOK+0x26b/0x410 include/linux/netfilter.h:300
NF_HOOK+0x364/0x410 include/linux/netfilter.h:302
__netif_receive_skb_one_core net/core/dev.c:5524 [inline]
__netif_receive_skb+0x1c6/0x530 net/core/dev.c:5638
process_backlog+0x363/0x7f0 net/core/dev.c:6515
__napi_poll+0xc7/0x440 net/core/dev.c:7074
napi_poll net/core/dev.c:7141 [inline]
net_rx_action+0x617/0xda0 net/core/dev.c:7231
handle_softirqs+0x3a7/0x930 kernel/softirq.c:558
run_ksoftirqd+0xc6/0x120 kernel/softirq.c:925
smpboot_thread_fn+0x51b/0x9d0 kernel/smpboot.c:164
kthread+0x3f6/0x4f0 kernel/kthread.c:334
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287