INFO: task syz.3.7965:3427 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.3.7965 state:D stack:28552 pid:3427 tgid:3426 ppid:32453 task_flags:0x400040 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5325 [inline] __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0x165/0x360 kernel/sched/core.c:7026 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7083 rwsem_down_read_slowpath+0x5fd/0x8f0 kernel/locking/rwsem.c:1086 __down_read_common kernel/locking/rwsem.c:1261 [inline] __down_read kernel/locking/rwsem.c:1274 [inline] down_read+0x98/0x2e0 kernel/locking/rwsem.c:1539 __super_lock fs/super.c:59 [inline] super_lock+0x2a9/0x3b0 fs/super.c:121 user_get_super+0xc8/0x120 fs/super.c:997 quotactl_block fs/quota/quota.c:890 [inline] __do_sys_quotactl fs/quota/quota.c:955 [inline] __se_sys_quotactl+0x4da/0x950 fs/quota/quota.c:917 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f53eb38efc9 RSP: 002b:00007f53ec18e038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3 RAX: ffffffffffffffda RBX: 00007f53eb5e5fa0 RCX: 00007f53eb38efc9 RDX: 0000000000000000 RSI: 0000200000000000 RDI: ffffffff80000402 RBP: 00007f53eb411f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000200000000100 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f53eb5e6038 R14: 00007f53eb5e5fa0 R15: 00007fff59ea6f78 INFO: task syz.3.7965:3431 blocked for more than 144 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.3.7965 state:D stack:26824 pid:3431 tgid:3426 ppid:32453 task_flags:0x400140 flags:0x00080002 Call Trace: context_switch kernel/sched/core.c:5325 [inline] __schedule+0x1798/0x4cc0 kernel/sched/core.c:6929 __schedule_loop kernel/sched/core.c:7011 [inline] schedule+0x165/0x360 kernel/sched/core.c:7026 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7083 rwsem_down_read_slowpath+0x5fd/0x8f0 kernel/locking/rwsem.c:1086 __down_read_common kernel/locking/rwsem.c:1261 [inline] __down_read kernel/locking/rwsem.c:1274 [inline] down_read+0x98/0x2e0 kernel/locking/rwsem.c:1539 __super_lock fs/super.c:59 [inline] super_lock+0x2a9/0x3b0 fs/super.c:121 user_get_super+0xc8/0x120 fs/super.c:997 quotactl_block fs/quota/quota.c:890 [inline] __do_sys_quotactl fs/quota/quota.c:955 [inline] __se_sys_quotactl+0x4da/0x950 fs/quota/quota.c:917 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0xfa0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f53eb38efc9 RSP: 002b:00007f53ec14c038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3 RAX: ffffffffffffffda RBX: 00007f53eb5e6180 RCX: 00007f53eb38efc9 RDX: 0000000000000000 RSI: 0000200000002a80 RDI: ffffffff80000802 RBP: 00007f53eb411f91 R08: 0000000000000000 R09: 0000000000000000 R10: 0000200000002ac0 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f53eb5e6218 R14: 00007f53eb5e6180 R15: 00007fff59ea6f78 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffffffff8df3d2e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8df3d2e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline] #0: ffffffff8df3d2e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775 2 locks held by getty/5587: #0: ffff88814deb50a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000362c2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222 3 locks held by kworker/u8:20/13979: #0: ffff8880b883a058 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0xad/0x140 kernel/sched/core.c:646 #1: ffff8880b8924048 (psi_seq){-.-.}-{0:0}, at: psi_task_switch+0x53/0x880 kernel/sched/psi.c:933 #2: ffffffff8df3d2e0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #2: ffffffff8df3d2e0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:867 [inline] #2: ffffffff8df3d2e0 (rcu_read_lock){....}-{1:3}, at: class_rcu_constructor include/linux/rcupdate.h:1195 [inline] #2: ffffffff8df3d2e0 (rcu_read_lock){....}-{1:3}, at: unwind_next_frame+0xa5/0x2390 arch/x86/kernel/unwind_orc.c:479 2 locks held by syz-executor/17050: 3 locks held by syz-executor/22404: 1 lock held by syz.3.7965/3427: #0: ffff88802574e0e0 (&type->s_umount_key#89){++++}-{4:4}, at: __super_lock fs/super.c:59 [inline] #0: ffff88802574e0e0 (&type->s_umount_key#89){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:121 1 lock held by syz.3.7965/3431: #0: ffff88802574e0e0 (&type->s_umount_key#89){++++}-{4:4}, at: __super_lock fs/super.c:59 [inline] #0: ffff88802574e0e0 (&type->s_umount_key#89){++++}-{4:4}, at: super_lock+0x2a9/0x3b0 fs/super.c:121 3 locks held by syz.2.8167/4295: #0: ffff88807b108d88 (&sb->s_type->i_mutex_key#11){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:980 [inline] #0: ffff88807b108d88 (&sb->s_type->i_mutex_key#11){+.+.}-{4:4}, at: __sock_release net/socket.c:661 [inline] #0: ffff88807b108d88 (&sb->s_type->i_mutex_key#11){+.+.}-{4:4}, at: sock_close+0x9b/0x240 net/socket.c:1455 #1: ffff888027af9260 (sk_lock-AF_CAIF){+.+.}-{0:0}, at: lock_sock include/net/sock.h:1679 [inline] #1: ffff888027af9260 (sk_lock-AF_CAIF){+.+.}-{0:0}, at: caif_release+0xf9/0x380 net/caif/caif_socket.c:914 #2: ffffffff8df42d78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:311 [inline] #2: ffffffff8df42d78 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x2f6/0x730 kernel/rcu/tree_exp.h:957 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:332 [inline] watchdog+0xf60/0xfa0 kernel/hung_task.c:495 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x4bc/0x870 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 22404 Comm: syz-executor Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/02/2025 RIP: 0010:__lock_is_held kernel/locking/lockdep.c:5601 [inline] RIP: 0010:lock_is_held_type+0xaa/0x190 kernel/locking/lockdep.c:5940 Code: 41 83 bd 28 0b 00 00 00 7e 48 4c 89 eb 48 81 c3 30 0b 00 00 45 31 ff 49 83 ff 31 73 24 48 89 df 4c 89 f6 e8 78 02 00 00 85 c0 <75> 2a 49 ff c7 49 63 85 28 0b 00 00 48 83 c3 28 49 39 c7 7c d8 eb RSP: 0018:ffffc9000b6873d8 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffff88802b38e5f0 RCX: e07dabab2fefad00 RDX: ffff888024be3c80 RSI: ffffffff8df3d3a0 RDI: ffff88802b38e5f0 RBP: 00000000ffffffff R08: ffff88802b38dac7 R09: 1ffff11005671b58 R10: dffffc0000000000 R11: ffffed1005671b59 R12: 0000000000000046 R13: ffff88802b38dac0 R14: ffffffff8df3d3a0 R15: 0000000000000000 FS: 000055556c30a500(0000) GS:ffff88812623e000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000027000 CR3: 0000000085367000 CR4: 0000000000350ef0 Call Trace: lock_is_held include/linux/lockdep.h:249 [inline] rcu_read_lock_sched_held+0x89/0x100 kernel/rcu/update.c:126 task_css_set include/linux/cgroup.h:446 [inline] task_dfl_cgroup include/linux/cgroup.h:515 [inline] task_psi_group+0x50/0x1a0 kernel/sched/psi.c:889 psi_account_irqtime+0x175/0x750 kernel/sched/psi.c:1021 __schedule+0x8f9/0x4cc0 kernel/sched/core.c:6922 preempt_schedule_irq+0xb5/0x150 kernel/sched/core.c:7256 irqentry_exit+0x6f/0x90 kernel/entry/common.c:211 asm_sysvec_reschedule_ipi+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 RIP: 0010:block_operations fs/f2fs/checkpoint.c:-1 [inline] RIP: 0010:f2fs_write_checkpoint+0x535/0x2440 fs/f2fs/checkpoint.c:1678 Code: 84 24 88 00 00 00 48 89 d8 48 81 c3 50 0b 00 00 48 05 f0 0b 00 00 48 89 44 24 28 4c 89 b4 24 18 01 00 00 eb 25 e8 0b 33 b0 fd f2 04 00 00 48 c7 c7 a0 13 b3 8b 31 d2 e8 a8 c4 81 fd 2e 2e 2e RSP: 0018:ffffc9000b6878c0 EFLAGS: 00000293 RAX: ffffffff840fd81a RBX: ffff8880631c4b50 RCX: ffff88802b38dac0 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002 RBP: ffffc9000b687c10 R08: ffff888051142edb R09: 1ffff1100a2285db R10: dffffc0000000000 R11: ffffed100a2285dc R12: ffff888051142cd8 R13: dffffc0000000000 R14: ffffffffffffffff R15: dffffc0000000000 kill_f2fs_super+0x2cc/0x6d0 fs/f2fs/super.c:5448 deactivate_locked_super+0xbc/0x130 fs/super.c:473 cleanup_mnt+0x425/0x4c0 fs/namespace.c:1327 task_work_run+0x1d4/0x260 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xe9/0x130 kernel/entry/common.c:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x2bd/0xfa0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f781cf902f7 Code: a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 0f 1f 44 00 00 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 a8 ff ff ff f7 d8 64 89 02 b8 RSP: 002b:00007fffcae7fb58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 00007f781d011d7d RCX: 00007f781cf902f7 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fffcae7fc10 RBP: 00007fffcae7fc10 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007fffcae80ca0 R13: 00007f781d011d7d R14: 00000000002415c2 R15: 00007fffcae80ce0 IPVS: fo: UDP 224.0.0.2:0 - no destination available IPVS: fo: UDP 224.0.0.2:0 - no destination available IPVS: fo: UDP 224.0.0.2:0 - no destination available IPVS: fo: UDP 224.0.0.2:0 - no destination available IPVS: fo: UDP 224.0.0.2:0 - no destination available IPVS: fo: UDP 224.0.0.2:0 - no destination available