INFO: task syz.0.250:7088 blocked for more than 143 seconds. Not tainted 6.13.0-rc6-syzkaller-00051-geea6e4b4dfb8 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.250 state:D stack:24752 pid:7088 tgid:7087 ppid:5815 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0xe58/0x5ad0 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0xe7/0x350 kernel/sched/core.c:6848 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6905 rwsem_down_read_slowpath+0x61e/0xb20 kernel/locking/rwsem.c:1084 __down_read_common kernel/locking/rwsem.c:1248 [inline] __down_read kernel/locking/rwsem.c:1261 [inline] down_read+0x124/0x330 kernel/locking/rwsem.c:1526 __super_lock fs/super.c:58 [inline] super_lock+0x31a/0x3f0 fs/super.c:120 super_lock_shared fs/super.c:139 [inline] iterate_supers+0xb9/0x240 fs/super.c:931 ksys_sync+0x8a/0x150 fs/sync.c:102 __do_sys_sync+0xe/0x20 fs/sync.c:113 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f67fb985d29 RSP: 002b:00007f67fc6ff038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f67fbb75fa0 RCX: 00007f67fb985d29 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f67fbb75fa0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f67fbb75fa0 R15: 00007ffc685089e8 Showing all locks held in the system: 1 lock held by khungtaskd/30: #0: ffffffff8e1bb900 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e1bb900 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e1bb900 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x7f/0x390 kernel/locking/lockdep.c:6744 4 locks held by kworker/u8:2/35: #0: ffff8881446ff948 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work+0x1293/0x1ba0 kernel/workqueue.c:3204 #1: ffffc90000ab7d80 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x921/0x1ba0 kernel/workqueue.c:3205 #2: ffff8880b873ebd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:598 #3: ffff8880b8728a88 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x2c1/0x8e0 kernel/sched/psi.c:987 3 locks held by kworker/u8:7/3062: 3 locks held by dhcpcd/5485: #0: ffff8880b863ebd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested kernel/sched/core.c:606 [inline] #0: ffff8880b863ebd8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x7e/0x130 kernel/sched/core.c:591 #1: ffff8880b8628a88 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x2c1/0x8e0 kernel/sched/psi.c:987 #2: ffff88803107d298 (&p->pi_lock){-.-.}-{2:2}, at: class_raw_spinlock_irqsave_constructor include/linux/spinlock.h:551 [inline] #2: ffff88803107d298 (&p->pi_lock){-.-.}-{2:2}, at: try_to_wake_up+0xb6/0x1490 kernel/sched/core.c:4205 2 locks held by getty/5576: #0: ffff8880365e20a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243 #1: ffffc90002fde2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0xfba/0x1480 drivers/tty/n_tty.c:2211 1 lock held by syz-executor/5822: #0: ffff88807dfc80e0 (&type->s_umount_key#70){++++}-{4:4}, at: __super_lock fs/super.c:56 [inline] #0: ffff88807dfc80e0 (&type->s_umount_key#70){++++}-{4:4}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88807dfc80e0 (&type->s_umount_key#70){++++}-{4:4}, at: deactivate_super+0xd6/0x100 fs/super.c:505 1 lock held by syz.0.250/7088: #0: ffff88807dfc80e0 (&type->s_umount_key#70){++++}-{4:4}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807dfc80e0 (&type->s_umount_key#70){++++}-{4:4}, at: super_lock+0x31a/0x3f0 fs/super.c:120 1 lock held by syz.1.508/8481: #0: ffffffff8e1c7238 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x282/0x3b0 kernel/rcu/tree_exp.h:297 1 lock held by syz.7.510/8475: #0: ffffffff8e1c7238 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock+0x1a4/0x3b0 kernel/rcu/tree_exp.h:329 1 lock held by syz.4.509/8487: #0: ffffffff8e089a68 (sched_core_mutex){+.+.}-{4:4}, at: sched_core_get+0x3f/0xa0 kernel/sched/core.c:454 1 lock held by dhcpcd/8494: #0: ffff888028166258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1623 [inline] #0: ffff888028166258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x2c/0xf60 net/packet/af_packet.c:3253 1 lock held by dhcpcd/8495: #0: ffff888033b00258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1623 [inline] #0: ffff888033b00258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x2c/0xf60 net/packet/af_packet.c:3253 1 lock held by dhcpcd/8496: #0: ffff88805ac5e258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1623 [inline] #0: ffff88805ac5e258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x2c/0xf60 net/packet/af_packet.c:3253 1 lock held by dhcpcd/8497: #0: ffff8880269c6258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1623 [inline] #0: ffff8880269c6258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x2c/0xf60 net/packet/af_packet.c:3253 1 lock held by dhcpcd/8498: #0: ffff8880317aa258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1623 [inline] #0: ffff8880317aa258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x2c/0xf60 net/packet/af_packet.c:3253 1 lock held by dhcpcd/8499: #0: ffff8880317ac258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1623 [inline] #0: ffff8880317ac258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x2c/0xf60 net/packet/af_packet.c:3253 1 lock held by dhcpcd/8500: #0: ffff888029cda258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1623 [inline] #0: ffff888029cda258 (sk_lock-AF_PACKET){+.+.}-{0:0}, at: packet_do_bind+0x2c/0xf60 net/packet/af_packet.c:3253 1 lock held by dhcpcd/8503: ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.13.0-rc6-syzkaller-00051-geea6e4b4dfb8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 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:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:234 [inline] watchdog+0xf14/0x1240 kernel/hung_task.c:397 kthread+0x2c1/0x3a0 kernel/kthread.c:389 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 5820 Comm: syz-executor Not tainted 6.13.0-rc6-syzkaller-00051-geea6e4b4dfb8 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:__x64_sys_read+0x0/0xb0 fs/read_write.c:715 Code: f7 e8 34 c4 ee ff e9 21 ff ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 53 48 89 fb 48 83 ec 10 e8 ef 1f 8c ff 48 8d 7b 60 48 RSP: 0018:ffffc90003377f20 EFLAGS: 00000246 RAX: ffffffffffffffff RBX: ffffc90003377f58 RCX: 1ffffffff20bdf49 RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffc90003377f58 RBP: ffffc90003377f48 R08: 0000000000000001 R09: 0000000000000001 R10: ffffffff905f3d97 R11: 0000000000000000 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 FS: 0000555559801500(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f06e2b47ab8 CR3: 000000005fff2000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f06e298473c Code: ec 28 48 89 54 24 18 48 89 74 24 10 89 7c 24 08 e8 99 93 02 00 48 8b 54 24 18 48 8b 74 24 10 41 89 c0 8b 7c 24 08 31 c0 0f 05 <48> 3d 00 f0 ff ff 77 34 44 89 c7 48 89 44 24 08 e8 ef 93 02 00 48 RSP: 002b:00007ffcd16fb1b0 EFLAGS: 00000246 ORIG_RAX: 0000000000000000 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f06e298473c RDX: 0000000000000030 RSI: 00007ffcd16fb260 RDI: 00000000000000f9 RBP: 00007ffcd16fb20c R08: 0000000000000000 R09: 0079746972756365 R10: 00007f06e2b487e0 R11: 0000000000000246 R12: 0000000000000032 R13: 000000000005889a R14: 00007ffcd16fb260 R15: 0000000000000081