Message-ID: <67153e74.050a0220.3d9749.000c.GAE@google.com>
Date: Sun, 20 Oct 2024 10:31:32 -0700
From: syzbot <syzbot+47dcc37219cf4421eec6@...kaller.appspotmail.com>
To: coreteam@...filter.org, davem@...emloft.net, edumazet@...gle.com, 
	kadlec@...filter.org, kuba@...nel.org, linux-kernel@...r.kernel.org, 
	netdev@...r.kernel.org, netfilter-devel@...r.kernel.org, pabeni@...hat.com, 
	pablo@...filter.org, syzkaller-bugs@...glegroups.com
Subject: [syzbot] [netfilter?] INFO: task hung in do_arpt_get_ctl (2)

Hello,

syzbot found the following issue on:

HEAD commit:    2f87d0916ce0 Merge tag 'trace-ringbuffer-v6.12-rc3' of git..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13d23887980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=cfbd94c114a3d407
dashboard link: https://syzkaller.appspot.com/bug?extid=47dcc37219cf4421eec6
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=103b7727980000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-2f87d091.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/2704ba6867a8/vmlinux-2f87d091.xz
kernel image: https://storage.googleapis.com/syzbot-assets/9f7121fd532b/bzImage-2f87d091.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+47dcc37219cf4421eec6@...kaller.appspotmail.com

INFO: task syz-executor:5236 blocked for more than 143 seconds.
      Not tainted 6.12.0-rc3-syzkaller-00044-g2f87d0916ce0 #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:20608 pid:5236  tgid:5236  ppid:5230   flags:0x00000000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5322 [inline]
 __schedule+0x1895/0x4b30 kernel/sched/core.c:6682
 __schedule_loop kernel/sched/core.c:6759 [inline]
 schedule+0x14b/0x320 kernel/sched/core.c:6774
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6831
 __mutex_lock_common kernel/locking/mutex.c:684 [inline]
 __mutex_lock+0x6a7/0xd70 kernel/locking/mutex.c:752
 xt_find_table_lock+0x4c/0x3b0 net/netfilter/x_tables.c:1243
 xt_request_find_table_lock+0x26/0x100 net/netfilter/x_tables.c:1285
 get_info net/ipv4/netfilter/arp_tables.c:808 [inline]
 do_arpt_get_ctl+0x904/0x16b0 net/ipv4/netfilter/arp_tables.c:1452
 nf_getsockopt+0x299/0x2c0 net/netfilter/nf_sockopt.c:116
 ip_getsockopt+0x222/0x2e0 net/ipv4/ip_sockglue.c:1777
 tcp_getsockopt+0x163/0x1c0 net/ipv4/tcp.c:4670
 do_sock_getsockopt+0x3c4/0x7e0 net/socket.c:2396
 __sys_getsockopt+0x267/0x330 net/socket.c:2425
 __do_sys_getsockopt net/socket.c:2435 [inline]
 __se_sys_getsockopt net/socket.c:2432 [inline]
 __x64_sys_getsockopt+0xb5/0xd0 net/socket.c:2432
 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: 0033:0x7f766ed7fd3a
RSP: 002b:00007ffc9412c6b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f766ed7fd3a
RDX: 0000000000000060 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007ffc9412c6d0 R08: 00007ffc9412c6cc R09: 00007ffc9412cab7
R10: 00007ffc9412c6d0 R11: 0000000000000246 R12: 00007ffc9412c6cc
R13: 00000000000481ce R14: 00000000000481a7 R15: 00007ffc9412cdf0
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/25:
 #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline]
 #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8e937de0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6720
1 lock held by kswapd0/79:
1 lock held by klogd/4585:
 #0: ffffffff8ea37160 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:3907 [inline]
 #0: ffffffff8ea37160 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xd4/0x3c0 mm/page_alloc.c:3932
1 lock held by dhcpcd/4810:
 #0: ffffffff8ea37160 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:3907 [inline]
 #0: ffffffff8ea37160 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xd4/0x3c0 mm/page_alloc.c:3932
2 locks held by getty/4897:
 #0: ffff88801ebb90a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000039b2f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211
2 locks held by syz-execprog/5134:
 #0: ffff88803e1ae8a8 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:870 [inline]
 #0: ffff88803e1ae8a8 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_fault+0xd54/0x1950 mm/filemap.c:3350
 #1: ffffffff8ea37160 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:3907 [inline]
 #1: ffffffff8ea37160 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xd4/0x3c0 mm/page_alloc.c:3932
1 lock held by syz-executor/5126:
 #0: ffffffff8ea37160 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:3907 [inline]
 #0: ffffffff8ea37160 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xd4/0x3c0 mm/page_alloc.c:3932
2 locks held by syz-executor/5231:
 #0: ffff8880006f29b8 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read include/linux/mm.h:704 [inline]
 #0: ffff8880006f29b8 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x34b/0x790 mm/memory.c:6228
 #1: ffffffff8ea37160 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:3907 [inline]
 #1: ffffffff8ea37160 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xd4/0x3c0 mm/page_alloc.c:3932
1 lock held by syz-executor/5232:
 #0: ffff88801bba2458 (&xt[i].mutex){+.+.}-{3:3}, at: xt_find_table_lock+0x4c/0x3b0 net/netfilter/x_tables.c:1243
2 locks held by syz-executor/5233:
 #0: ffff88801198f220 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read include/linux/mm.h:704 [inline]
 #0: ffff88801198f220 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x34b/0x790 mm/memory.c:6228
 #1: ffffffff8ea37160 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:3907 [inline]
 #1: ffffffff8ea37160 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xd4/0x3c0 mm/page_alloc.c:3932
2 locks held by syz-executor/5234:
 #0: ffff88801bba2458 (&xt[i].mutex){+.+.}-{3:3}, at: xt_find_table_lock+0x4c/0x3b0 net/netfilter/x_tables.c:1243
 #1: ffffffff8ea37160 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:3907 [inline]
 #1: ffffffff8ea37160 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xd4/0x3c0 mm/page_alloc.c:3932
2 locks held by syz-executor/5235:
 #0: ffff88803c3ac808 (&vma->vm_lock->lock){++++}-{3:3}, at: vma_start_read include/linux/mm.h:704 [inline]
 #0: ffff88803c3ac808 (&vma->vm_lock->lock){++++}-{3:3}, at: lock_vma_under_rcu+0x34b/0x790 mm/memory.c:6228
 #1: ffffffff8ea37160 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:3907 [inline]
 #1: ffffffff8ea37160 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xd4/0x3c0 mm/page_alloc.c:3932
1 lock held by syz-executor/5236:
 #0: ffff88801bba2458 (&xt[i].mutex){+.+.}-{3:3}, at: xt_find_table_lock+0x4c/0x3b0 net/netfilter/x_tables.c:1243

=============================================

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 25 Comm: khungtaskd Not tainted 6.12.0-rc3-syzkaller-00044-g2f87d0916ce0 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __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:223 [inline]
 watchdog+0xff4/0x1040 kernel/hung_task.c:379
 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
 </TASK>


---
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