INFO: task syz.5.4445:20171 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.5.4445      state:D stack:24408 pid:20171 tgid:20171 ppid:17842  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5387 [inline]
 __schedule+0x17b4/0x5680 kernel/sched/core.c:7188
 __schedule_loop kernel/sched/core.c:7267 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7282
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7339
 __mutex_lock_common kernel/locking/mutex.c:712 [inline]
 __mutex_lock+0x7f5/0x1550 kernel/locking/mutex.c:806
 pipe_release+0x48/0x330 fs/pipe.c:729
 __fput+0x44f/0xa60 fs/file_table.c:510
 task_work_run+0x1d9/0x270 kernel/task_work.c:233
 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline]
 __exit_to_user_mode_loop kernel/entry/common.c:67 [inline]
 exit_to_user_mode_loop+0xed/0x480 kernel/entry/common.c:98
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:328 [inline]
 do_syscall_64+0x33e/0xf80 arch/x86/entry/syscall_64.c:100
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f122a99c819
RSP: 002b:00007f122ad3fba8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f122ac17da0 RCX: 00007f122a99c819
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f122ac17da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007f122ac17cb0 R11: 0000000000000246 R12: 00000000000de9f0
R13: 00007f122ac1627c R14: 00000000000de80f R15: 00007f122ad3fcb0
 </TASK>
INFO: task syz.5.4445:20174 blocked for more than 144 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.4445      state:D stack:28760 pid:20174 tgid:20171 ppid:17842  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5387 [inline]
 __schedule+0x17b4/0x5680 kernel/sched/core.c:7188
 __schedule_loop kernel/sched/core.c:7267 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7282
 __lock_sock+0x162/0x2c0 net/core/sock.c:3191
 lock_sock_nested+0xc7/0x100 net/core/sock.c:3804
 lock_sock include/net/sock.h:1713 [inline]
 sockopt_lock_sock net/core/sock.c:1154 [inline]
 sk_setsockopt+0xe62/0x2d60 net/core/sock.c:1312
 do_sock_setsockopt+0x11b/0x1b0 net/socket.c:2377
 __sys_setsockopt net/socket.c:2406 [inline]
 __do_sys_setsockopt net/socket.c:2412 [inline]
 __se_sys_setsockopt net/socket.c:2409 [inline]
 __x64_sys_setsockopt+0x13d/0x1b0 net/socket.c:2409
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f122a99c819
RSP: 002b:00007f122b882028 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007f122ac16090 RCX: 00007f122a99c819
RDX: 0000000000000007 RSI: 0000000000000001 RDI: 0000000000000005
RBP: 00007f122aa32c91 R08: 0000000000000004 R09: 0000000000000000
R10: 0000200000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f122ac16128 R14: 00007f122ac16090 R15: 00007f122ad3fa48
 </TASK>
INFO: task syz.5.4445:20177 blocked for more than 144 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.4445      state:D stack:28760 pid:20177 tgid:20171 ppid:17842  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5387 [inline]
 __schedule+0x17b4/0x5680 kernel/sched/core.c:7188
 __schedule_loop kernel/sched/core.c:7267 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7282
 __lock_sock+0x162/0x2c0 net/core/sock.c:3191
 lock_sock_nested+0xc7/0x100 net/core/sock.c:3804
 lock_sock include/net/sock.h:1713 [inline]
 tcp_recvmsg+0x1e4/0x7e0 net/ipv4/tcp.c:2947
 sock_recvmsg_nosec net/socket.c:1137 [inline]
 sock_recvmsg+0x155/0x1b0 net/socket.c:1159
 __sys_recvfrom+0x240/0x3c0 net/socket.c:2315
 __do_sys_recvfrom net/socket.c:2330 [inline]
 __se_sys_recvfrom net/socket.c:2326 [inline]
 __x64_sys_recvfrom+0xde/0x100 net/socket.c:2326
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f122a99c819
RSP: 002b:00007f122b861028 EFLAGS: 00000246 ORIG_RAX: 000000000000002d
RAX: ffffffffffffffda RBX: 00007f122ac16180 RCX: 00007f122a99c819
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007f122aa32c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000720 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f122ac16218 R14: 00007f122ac16180 R15: 00007f122ad3fa48
 </TASK>
INFO: task syz.5.4445:20178 blocked for more than 145 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.4445      state:D stack:28760 pid:20178 tgid:20171 ppid:17842  task_flags:0x400040 flags:0x00080002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5387 [inline]
 __schedule+0x17b4/0x5680 kernel/sched/core.c:7188
 __schedule_loop kernel/sched/core.c:7267 [inline]
 schedule+0x164/0x360 kernel/sched/core.c:7282
 __lock_sock+0x162/0x2c0 net/core/sock.c:3191
 lock_sock_nested+0xc7/0x100 net/core/sock.c:3804
 lock_sock include/net/sock.h:1713 [inline]
 tcp_splice_read+0x15d/0x940 net/ipv4/tcp.c:838
 do_splice_read fs/splice.c:980 [inline]
 splice_file_to_pipe+0x446/0x6b0 fs/splice.c:1290
 do_splice+0x116f/0x1910 fs/splice.c:1374
 __do_splice fs/splice.c:1431 [inline]
 __do_sys_splice fs/splice.c:1634 [inline]
 __se_sys_splice+0x353/0x490 fs/splice.c:1616
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x15f/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f122a99c819
RSP: 002b:00007f122b840028 EFLAGS: 00000246 ORIG_RAX: 0000000000000113
RAX: ffffffffffffffda RBX: 00007f122ac16270 RCX: 00007f122a99c819
RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007f122aa32c91 R08: 0000000000000f3a R09: 0000000000000008
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f122ac16308 R14: 00007f122ac16270 R15: 00007f122ad3fa48
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/31:
 #0: ffffffff8e95caa0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:300 [inline]
 #0: ffffffff8e95caa0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline]
 #0: ffffffff8e95caa0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775
2 locks held by getty/5580:
 #0: ffff88803788a0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc9000322b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0 drivers/tty/n_tty.c:2211
1 lock held by syz.0.463/7378:
4 locks held by kworker/u8:12/7768:
 #0: ffff88801be9e140 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3277 [inline]
 #0: ffff88801be9e140 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0xa35/0x1860 kernel/workqueue.c:3385
 #1: ffffc900033f7c40 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3278 [inline]
 #1: ffffc900033f7c40 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0xa70/0x1860 kernel/workqueue.c:3385
 #2: ffffffff8fdca6e8 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf4/0x800 net/core/net_namespace.c:673
 #3: ffffffff8e962c78 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x4c/0x580 kernel/rcu/tree.c:3828
1 lock held by syz.5.4445/20171:
 #0: ffff888033c55860 (&pipe->mutex){+.+.}-{4:4}, at: pipe_release+0x48/0x330 fs/pipe.c:729
4 locks held by syz.5.4445/20172:
1 lock held by syz.5.4445/20174:
 #0: ffff888041560260 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline]
 #0: ffff888041560260 (sk_lock-AF_INET){+.+.}-{0:0}, at: sockopt_lock_sock net/core/sock.c:1154 [inline]
 #0: ffff888041560260 (sk_lock-AF_INET){+.+.}-{0:0}, at: sk_setsockopt+0xe62/0x2d60 net/core/sock.c:1312
1 lock held by syz.5.4445/20177:
 #0: ffff888041560260 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline]
 #0: ffff888041560260 (sk_lock-AF_INET){+.+.}-{0:0}, at: tcp_recvmsg+0x1e4/0x7e0 net/ipv4/tcp.c:2947
2 locks held by syz.5.4445/20178:
 #0: ffff888033c55860 (&pipe->mutex){+.+.}-{4:4}, at: splice_file_to_pipe+0x40/0x6b0 fs/splice.c:1287
 #1: ffff888041560260 (sk_lock-AF_INET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1713 [inline]
 #1: ffff888041560260 (sk_lock-AF_INET){+.+.}-{0:0}, at: tcp_splice_read+0x15d/0x940 net/ipv4/tcp.c:838

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
Call Trace:
 <TASK>
 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:161 [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:346 [inline]
 watchdog+0xfaa/0x1000 kernel/hung_task.c:515
 kthread+0x388/0x470 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
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026
RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63
Code: 5b 76 02 e9 83 f4 02 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d e3 3d 17 00 fb f4 <c3> cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffc90000197e20 EFLAGS: 00000246
RAX: 0000000000d8d7e7 RBX: ffffffff8199faca RCX: 0000000080000001
RDX: 0000000000000001 RSI: ffffffff8dfc507f RDI: ffffffff8c282a00
RBP: ffffc90000197f10 R08: ffff8880b87339db R09: 1ffff110170e673b
R10: dffffc0000000000 R11: ffffed10170e673c R12: 0000000000000001
R13: 1ffff11003bd9000 R14: 0000000000000001 R15: 1ffff11003bd9000
FS:  0000000000000000(0000) GS:ffff88812533d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd3dafeb4b8 CR3: 000000007531e000 CR4: 00000000003526f0
DR0: ffffffffffffffff DR1: 00000000000001f8 DR2: 0000000000000083
DR3: ffffffffefffff15 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/kernel/process.c:766 [inline]
 default_idle+0x9/0x20 arch/x86/kernel/process.c:767
 default_idle_call+0x72/0xb0 kernel/sched/idle.c:122
 cpuidle_idle_call kernel/sched/idle.c:199 [inline]
 do_idle+0x36a/0x5f0 kernel/sched/idle.c:352
 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:451
 start_secondary+0x101/0x110 arch/x86/kernel/smpboot.c:312
 common_startup_64+0x13e/0x147
 </TASK>
sctp: sctp_transport_update_pmtu: Reported pmtu 68 too low, using default minimum of 512