INFO: task syz.5.2625:14965 blocked for more than 143 seconds.
Not tainted 6.16.0-rc5-syzkaller-00193-g40f92e79b0aa #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.2625 state:D stack:24952 pid:14965 tgid:14962 ppid:11796 task_flags:0x400140 flags:0x00004004
Call Trace:
context_switch kernel/sched/core.c:5401 [inline]
__schedule+0x116a/0x5de0 kernel/sched/core.c:6790
__schedule_loop kernel/sched/core.c:6868 [inline]
schedule+0xe7/0x3a0 kernel/sched/core.c:6883
io_schedule+0xbf/0x130 kernel/sched/core.c:7728
folio_wait_bit_common+0x3d6/0x9e0 mm/filemap.c:1317
folio_lock include/linux/pagemap.h:1114 [inline]
migrate_folio_unmap mm/migrate.c:1183 [inline]
migrate_pages_batch+0x14d0/0x31a0 mm/migrate.c:1807
migrate_pages_sync+0x4c5/0x8a0 mm/migrate.c:1957
migrate_pages+0x1b67/0x23b0 mm/migrate.c:2039
compact_zone+0x2023/0x4760 mm/compaction.c:2683
compact_node+0x1a4/0x2d0 mm/compaction.c:2952
compact_nodes mm/compaction.c:2974 [inline]
sysctl_compaction_handler mm/compaction.c:3025 [inline]
sysctl_compaction_handler+0x141/0x210 mm/compaction.c:3012
proc_sys_call_handler+0x3bf/0x5c0 fs/proc/proc_sysctl.c:601
iter_file_splice_write+0x91c/0x1150 fs/splice.c:738
do_splice_from fs/splice.c:935 [inline]
direct_splice_actor+0x18f/0x6c0 fs/splice.c:1158
splice_direct_to_actor+0x342/0xa30 fs/splice.c:1102
do_splice_direct_actor fs/splice.c:1201 [inline]
do_splice_direct+0x174/0x240 fs/splice.c:1227
do_sendfile+0xb06/0xe50 fs/read_write.c:1370
__do_sys_sendfile64 fs/read_write.c:1425 [inline]
__se_sys_sendfile64 fs/read_write.c:1417 [inline]
__x64_sys_sendfile64+0x154/0x220 fs/read_write.c:1417
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f169eb8e929
RSP: 002b:00007f169fa97038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007f169edb5fa0 RCX: 00007f169eb8e929
RDX: 00002000000000c0 RSI: 0000000000000004 RDI: 0000000000000008
RBP: 00007f169ec10b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000005 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f169edb5fa0 R15: 00007ffcc4237438
Showing all locks held in the system:
1 lock held by khungtaskd/31:
#0: ffffffff8e5c4e80 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
#0: ffffffff8e5c4e80 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
#0: ffffffff8e5c4e80 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6770
3 locks held by kworker/0:3/974:
#0: ffff88801b878d48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1: ffffc90003a2fd10 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
#2: ffff888047bdb240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x1bb/0x2e80 drivers/net/netdevsim/fib.c:1490
2 locks held by getty/5594:
#0: ffff88814ca020a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
#1: ffffc9000333b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41b/0x14f0 drivers/tty/n_tty.c:2222
1 lock held by syz-executor/5818:
1 lock held by udevd/10545:
#0: ffff888142f1d358 (&disk->open_mutex){+.+.}-{4:4}, at: bdev_open+0x41a/0xe40 block/bdev.c:945
1 lock held by syz.5.2625/14965:
#0: ffff88802a9d6428 (sb_writers#3){.+.+}-{0:0}, at: splice_direct_to_actor+0x342/0xa30 fs/splice.c:1102
2 locks held by kworker/u8:12/15810:
#0: ffff8880b843a2d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:614 [inline]
#0: ffff8880b843a2d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x7e/0x130 kernel/sched/core.c:599
#1: ffff8880b8424088 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x2c1/0x8e0 kernel/sched/psi.c:987
2 locks held by kworker/u8:23/15828:
#0: ffff88801fb46948 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
#1: ffffc90003e0fd10 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
1 lock held by syz-executor/16747:
#0: ffffffff8e5d0340 (rcu_state.barrier_mutex){+.+.}-{4:4}, at: rcu_barrier+0x48/0x6e0 kernel/rcu/tree.c:3786
=============================================
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted 6.16.0-rc5-syzkaller-00193-g40f92e79b0aa #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Call Trace:
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline]
watchdog+0xf70/0x12c0 kernel/hung_task.c:470
kthread+0x3c5/0x780 kernel/kthread.c:464
ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 5818 Comm: syz-executor Not tainted 6.16.0-rc5-syzkaller-00193-g40f92e79b0aa #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:__lock_acquire+0x702/0x1c90 kernel/locking/lockdep.c:5273
Code: 0a 00 00 83 f8 2f 0f 87 e1 03 00 00 39 05 ca 04 3f 14 0f 82 eb 09 00 00 b8 01 00 00 00 48 8b 54 24 60 65 48 2b 15 b6 3f 38 12 <0f> 85 74 0f 00 00 48 83 c4 68 5b 5d 41 5c 41 5d 41 5e 41 5f c3 cc
RSP: 0018:ffffc90002f77838 EFLAGS: 00000046
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 00000000ef9d33e4
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000086db7919
RBP: ffff88807a482440 R08: 0ac0d5affe09d4ff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000001 R12: ffff88807a482f30
R13: ffff88807a482f30 R14: 000000005a44979c R15: 0000000000000001
FS: 0000555572db6500(0000) GS:ffff888124715000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b304e1ff8 CR3: 0000000032fff000 CR4: 00000000003526f0
Call Trace:
lock_acquire kernel/locking/lockdep.c:5871 [inline]
lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5828
rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
rcu_read_lock include/linux/rcupdate.h:841 [inline]
avc_has_perm_noaudit+0x67/0x3b0 security/selinux/avc.c:1156
avc_has_perm+0xc0/0x1c0 security/selinux/avc.c:1195
sock_has_perm+0x252/0x2f0 security/selinux/hooks.c:4765
security_socket_recvmsg+0x238/0x260 security/security.c:4691
sock_recvmsg+0x4a/0x250 net/socket.c:1037
sock_read_iter+0x2b9/0x3b0 net/socket.c:1109
new_sync_read fs/read_write.c:491 [inline]
vfs_read+0xa95/0xc60 fs/read_write.c:572
ksys_read+0x1f8/0x250 fs/read_write.c:715
do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94
entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f1de578d2fd
Code: a8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb b5 e8 a8 48 00 00 0f 1f 84 00 00 00 00 00 80 3d 41 92 1f 00 00 74 17 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 5b c3 66 2e 0f 1f 84 00 00 00 00 00 48 83 ec
RSP: 002b:00007ffca098d128 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f1de578d2fd
RDX: 0000000000000004 RSI: 00007ffca098d13c RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000026cb6 R09: 00007f1de6584000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffca098d550
R13: 0000000000000004 R14: 00007ffca098d13c R15: 00007ffca098d1d0