INFO: task syz-executor:9142 blocked for more than 143 seconds.
      Not tainted 5.15.189-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz-executor    state:D stack:21248 pid: 9142 ppid:     1 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0x11b8/0x43b0 kernel/sched/core.c:6376
 schedule+0x11b/0x1e0 kernel/sched/core.c:6459
 rwsem_down_write_slowpath+0xc46/0x11f0 kernel/locking/rwsem.c:1165
 deactivate_super+0xa0/0xd0 fs/super.c:365
 cleanup_mnt+0x418/0x4d0 fs/namespace.c:1139
 task_work_run+0x125/0x1a0 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0x10f/0x130 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7feb117ede97
RSP: 002b:00007fffa6928998 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007feb1186fbdd RCX: 00007feb117ede97
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fffa6928a50
RBP: 00007fffa6928a50 R08: 0000000000000000 R09: 0000000000000000
R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fffa6929ae0
R13: 00007feb1186fbdd R14: 00000000000d933e R15: 00007fffa6929b20
 </TASK>
INFO: task syz.8.2384:13645 blocked for more than 144 seconds.
      Not tainted 5.15.189-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.8.2384      state:D stack:27040 pid:13645 ppid: 12056 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5030 [inline]
 __schedule+0x11b8/0x43b0 kernel/sched/core.c:6376
 schedule+0x11b/0x1e0 kernel/sched/core.c:6459
 jfs_flush_journal+0x70d/0xeb0 fs/jfs/jfs_logmgr.c:1572
 jfs_sync_fs+0x79/0xa0 fs/jfs/super.c:689
 iterate_supers+0x11e/0x1d0 fs/super.c:718
 ksys_sync+0xaf/0x150 fs/sync.c:104
 __ia32_sys_sync+0xa/0x10 fs/sync.c:113
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fc0901fdb69
RSP: 002b:00007fc08e065038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007fc090424fa0 RCX: 00007fc0901fdb69
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007fc090424fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fc090424fa0 R15: 00007ffeb54d8128
 </TASK>

Showing all locks held in the system:
3 locks held by ksoftirqd/1/20:
1 lock held by khungtaskd/27:
 #0: ffffffff8c11c360 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30
2 locks held by udevd/3561:
 #0: ffff8880201ff518 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xf9/0x7d0 block/bdev.c:915
 #1: 
ffff88802023e468 (&lo->lo_mutex){+.+.}-{3:3}, at: lo_release+0x4d/0x1f0 drivers/block/loop.c:2071
2 locks held by getty/3950:
 #0: ffff88814c960098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252
 #1: ffffc900025e62e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x5ba/0x1a30 drivers/tty/n_tty.c:2158
1 lock held by udevd/4175:
 #0: ffff8880201ff518 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x157/0xa60 block/bdev.c:820
2 locks held by syz-executor/4184:
 #0: ffff888020047118 (&disk->open_mutex){+.+.}-{3:3}
, at: blkdev_put+0xf9/0x7d0 block/bdev.c:915
 #1: ffff888147759468 (&lo->lo_mutex){+.+.}-{3:3}, at: __loop_clr_fd+0xaa/0xb90 drivers/block/loop.c:1366
1 lock held by syz-executor/9142:
 #0: ffff8880779560e0 (&type->s_umount_key#120){++++}-{3:3}, at: deactivate_super+0xa0/0xd0 fs/super.c:365
1 lock held by syz-executor/11519:
 #0: ffff8880201ff518 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_get_by_dev+0x157/0xa60 block/bdev.c:820
1 lock held by syz.8.2384/13645:
 #0: ffff8880779560e0 (&type->s_umount_key#120){++++}-{3:3}, at: iterate_supers+0xa4/0x1d0 fs/super.c:716
2 locks held by syz.3.2822/15478:
 #0: ffff88802005c518 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xf9/0x7d0 block/bdev.c:915
 #1: ffff8880201a2468 (&lo->lo_mutex){+.+.}-{3:3}, at: lo_release+0x4d/0x1f0 drivers/block/loop.c:2071
3 locks held by syz.1.2821/15486:
2 locks held by syz.9.2824/15488:
 #0: ffff88802030ad18 (&disk->open_mutex){+.+.}-{3:3}, at: blkdev_put+0xf9/0x7d0 block/bdev.c:915
 #1: ffff8880202b4468 (&lo->lo_mutex){+.+.}-{3:3}, at: lo_release+0x4d/0x1f0 drivers/block/loop.c:2071

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

NMI backtrace for cpu 0
CPU: 0 PID: 27 Comm: khungtaskd Not tainted 5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x397/0x3d0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x163/0x280 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+0xe0f/0xe50 kernel/hung_task.c:369
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 20 Comm: ksoftirqd/1 Not tainted 5.15.189-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
RIP: 0010:__preempt_count_add kernel/rcu/tree.c:1119 [inline]
RIP: 0010:rcu_is_watching+0x0/0xa0 kernel/rcu/tree.c:1122
Code: 70 75 1b 48 8d 65 e8 5b 41 5e 41 5f 5d c3 e8 f7 80 44 08 41 f7 c7 00 02 00 00 75 b8 eb b7 e8 d7 80 44 08 0f 1f 80 00 00 00 00 <41> 57 41 56 53 65 ff 05 1c c3 9e 7e e8 cf 90 44 08 89 c3 83 f8 08
RSP: 0018:ffffc90000da6868 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 0000000000000000 RCX: ffff88813fe70000
RDX: 0000000000000100 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000da69d8 R08: ffffc90000da6b00 R09: ffffc90000da6b10
R10: fffff520001b4d2e R11: 1ffff920001b4d2c R12: 1ffff1100c1a608a
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffc90000da6ad8
FS:  0000000000000000(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb461153fa0 CR3: 0000000023074000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 rcu_read_lock_held_common kernel/rcu/update.c:108 [inline]
 rcu_read_lock_held+0x11/0x40 kernel/rcu/update.c:309
 __find_rr_leaf+0x342/0x6c0 net/ipv6/route.c:797
 find_rr_leaf net/ipv6/route.c:853 [inline]
 rt6_select net/ipv6/route.c:897 [inline]
 fib6_table_lookup+0x39c/0xa70 net/ipv6/route.c:2183
 ip6_pol_route+0x209/0x1290 net/ipv6/route.c:2219
 pol_lookup_func include/net/ip6_fib.h:582 [inline]
 fib6_rule_lookup+0x1d3/0x570 net/ipv6/fib6_rules.c:115
 ip6_route_output_flags+0xbf/0x300 net/ipv6/route.c:2640
 ip6_route_output include/net/ip6_route.h:98 [inline]
 __nf_ip6_route+0x3e/0xc0 net/ipv6/netfilter.c:113
 nf_ip6_route include/linux/netfilter_ipv6.h:111 [inline]
 synproxy_send_tcp_ipv6+0x238/0x6b0 net/netfilter/nf_synproxy_core.c:857
 synproxy_send_client_synack_ipv6+0x7e4/0xc50 net/netfilter/nf_synproxy_core.c:919
 nft_synproxy_eval_v6+0x36b/0x560 net/netfilter/nft_synproxy.c:90
 nft_synproxy_do_eval+0x3d3/0x570 net/netfilter/nft_synproxy.c:145
 expr_call_ops_eval net/netfilter/nf_tables_core.c:198 [inline]
 nft_do_chain+0x3fc/0x1420 net/netfilter/nf_tables_core.c:238
 nft_do_chain_inet+0x22b/0x300 net/netfilter/nft_chain_filter.c:161
 nf_hook_entry_hookfn include/linux/netfilter.h:142 [inline]
 nf_hook_slow+0xb9/0x200 net/netfilter/core.c:584
 nf_hook include/linux/netfilter.h:257 [inline]
 NF_HOOK+0x1cb/0x360 include/linux/netfilter.h:300
 NF_HOOK+0x2d6/0x360 include/linux/netfilter.h:302
 __netif_receive_skb_one_core net/core/dev.c:5525 [inline]
 __netif_receive_skb+0xcc/0x290 net/core/dev.c:5639
 process_backlog+0x364/0x780 net/core/dev.c:6516
 __napi_poll+0xc0/0x430 net/core/dev.c:7075
 napi_poll net/core/dev.c:7142 [inline]
 net_rx_action+0x4a8/0x9c0 net/core/dev.c:7232
 handle_softirqs+0x328/0x820 kernel/softirq.c:576
 run_ksoftirqd+0x98/0xf0 kernel/softirq.c:943
 smpboot_thread_fn+0x4f6/0x970 kernel/smpboot.c:164
 kthread+0x436/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>