INFO: task syz.0.27:4652 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.0.27 state:D stack:27872 pid: 4652 ppid: 4575 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5030 [inline] __schedule+0x11b8/0x43b0 kernel/sched/core.c:6376 schedule+0x11b/0x1e0 kernel/sched/core.c:6459 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6518 rwsem_down_read_slowpath+0x528/0x990 kernel/locking/rwsem.c:1055 __down_read_common kernel/locking/rwsem.c:1239 [inline] __down_read kernel/locking/rwsem.c:1252 [inline] down_read+0x96/0x2e0 kernel/locking/rwsem.c:1500 user_get_super+0x118/0x240 fs/super.c:850 quotactl_block fs/quota/quota.c:889 [inline] __do_sys_quotactl fs/quota/quota.c:953 [inline] __se_sys_quotactl+0x45e/0x6c0 fs/quota/quota.c:915 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: 0033:0x7f14563feb69 RSP: 002b:00007f145566e038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3 RAX: ffffffffffffffda RBX: 00007f1456625fa0 RCX: 00007f14563feb69 RDX: 0000000000000000 RSI: 0000200000000900 RDI: ffffffff80000600 RBP: 00007f1456481df1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f1456625fa0 R15: 00007ffea53045a8 INFO: task syz.2.28:4674 blocked for more than 145 seconds. Not tainted 5.15.189-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.2.28 state:D stack:27872 pid: 4674 ppid: 4585 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5030 [inline] __schedule+0x11b8/0x43b0 kernel/sched/core.c:6376 schedule+0x11b/0x1e0 kernel/sched/core.c:6459 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:6518 rwsem_down_read_slowpath+0x528/0x990 kernel/locking/rwsem.c:1055 __down_read_common kernel/locking/rwsem.c:1239 [inline] __down_read kernel/locking/rwsem.c:1252 [inline] down_read+0x96/0x2e0 kernel/locking/rwsem.c:1500 user_get_super+0x118/0x240 fs/super.c:850 quotactl_block fs/quota/quota.c:889 [inline] __do_sys_quotactl fs/quota/quota.c:953 [inline] __se_sys_quotactl+0x45e/0x6c0 fs/quota/quota.c:915 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: 0033:0x7fe3f4e55b69 RSP: 002b:00007fe3f40a4038 EFLAGS: 00000246 ORIG_RAX: 00000000000000b3 RAX: ffffffffffffffda RBX: 00007fe3f507d080 RCX: 00007fe3f4e55b69 RDX: 0000000000000000 RSI: 0000200000000900 RDI: ffffffff80000600 RBP: 00007fe3f4ed8df1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fe3f507d080 R15: 00007ffd55e0a768 Showing all locks held in the system: 4 locks held by kworker/u4:0/9: #0: ffff888016879138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x760/0x1000 kernel/workqueue.c:-1 #1: ffffc90000ce7d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x7a3/0x1000 kernel/workqueue.c:2285 #2: ffffffff8d235f48 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xa/0x50 net/core/link_watch.c:251 #3: ffff8880b913a318 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x26/0x140 kernel/sched/core.c:475 1 lock held by khungtaskd/27: #0: ffffffff8c11c360 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 2 locks held by getty/3946: #0: ffff88802bb5d098 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x21/0x70 drivers/tty/tty_ldisc.c:252 #1: ffffc900026562e8 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x5ba/0x1a30 drivers/tty/n_tty.c:2158 3 locks held by kworker/1:17/4295: #0: ffff88802a9a9138 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x760/0x1000 kernel/workqueue.c:-1 #1: ffffc9000361fd00 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x7a3/0x1000 kernel/workqueue.c:2285 #2: ffffffff8d235f48 (rtnl_mutex){+.+.}-{3:3}, at: addrconf_dad_work+0xc4/0x1520 net/ipv6/addrconf.c:4111 2 locks held by kworker/0:7/4365: #0: ffff888016872138 ((wq_completion)rcu_gp){+.+.}-{0:0}, at: process_one_work+0x760/0x1000 kernel/workqueue.c:-1 #1: ffffc90003b2fd00 ((work_completion)(&rew.rew_work)){+.+.}-{0:0}, at: process_one_work+0x7a3/0x1000 kernel/workqueue.c:2285 2 locks held by kworker/u4:6/4374: 1 lock held by syz.2.19/4403: 1 lock held by syz.0.17/4406: 1 lock held by syz.1.18/4409: 1 lock held by syz.4.21/4416: 1 lock held by syz.3.20/4422: 1 lock held by syz.6.23/4545: 1 lock held by syz.5.22/4549: 1 lock held by syz.7.24/4554: 1 lock held by syz.8.25/4561: 1 lock held by syz.9.26/4571: 1 lock held by syz.0.27/4652: #0: ffff88805c7aa0e0 (&type->s_umount_key#54){.+.+}-{3:3}, at: user_get_super+0x118/0x240 fs/super.c:850 1 lock held by syz.2.28/4674: #0: ffff88806149c0e0 (&type->s_umount_key#54){.+.+}-{3:3}, at: user_get_super+0x118/0x240 fs/super.c:850 1 lock held by syz.1.29/4703: #0: ffff88801eb820e0 (&type->s_umount_key#54){.+.+}-{3:3}, at: user_get_super+0x118/0x240 fs/super.c:850 1 lock held by syz.4.30/4716: #0: ffff888078b800e0 (&type->s_umount_key#54){.+.+}-{3:3}, at: user_get_super+0x118/0x240 fs/super.c:850 1 lock held by syz.3.31/4722: #0: ffff8880255da0e0 (&type->s_umount_key#54){.+.+}-{3:3}, at: user_get_super+0x118/0x240 fs/super.c:850 1 lock held by syz.6.32/4778: #0: ffff8880575ce0e0 (&type->s_umount_key#54){.+.+}-{3:3}, at: user_get_super+0x118/0x240 fs/super.c:850 1 lock held by syz.5.33/4795: #0: ffff8880273e60e0 (&type->s_umount_key#54){.+.+}-{3:3}, at: user_get_super+0x118/0x240 fs/super.c:850 1 lock held by syz.7.34/4860: #0: ffff88807e67c0e0 (&type->s_umount_key#54){.+.+}-{3:3}, at: user_get_super+0x118/0x240 fs/super.c:850 1 lock held by syz.9.36/4871: #0: ffff8880560160e0 (&type->s_umount_key#54){.+.+}-{3:3}, at: user_get_super+0x118/0x240 fs/super.c:850 1 lock held by syz.8.35/4878: #0: ffff88806174e0e0 (&type->s_umount_key#54){.+.+}-{3:3}, at: user_get_super+0x118/0x240 fs/super.c:850 1 lock held by syz-executor/4909: #0: ffffffff8d235f48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8d235f48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x974/0xe60 net/core/rtnetlink.c:5647 1 lock held by syz.0.37/4915: #0: ffff88805c7aa0e0 (&type->s_umount_key#54){.+.+}-{3:3}, at: user_get_super+0x118/0x240 fs/super.c:850 1 lock held by syz.2.38/4935: #0: ffff88806149c0e0 (&type->s_umount_key#54){.+.+}-{3:3}, at: user_get_super+0x118/0x240 fs/super.c:850 4 locks held by syz-executor/4942: #0: ffff88807eccc460 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x28a/0xd00 fs/read_write.c:590 #1: ffff88804cb9e088 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1e5/0x4c0 fs/kernfs/file.c:287 #2: ffff888022e76bd0 (kn->active#361){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x208/0x4c0 fs/kernfs/file.c:288 #3: ffffffff8cb70c88 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: new_device_store+0x13c/0x740 drivers/net/netdevsim/bus.c:295 7 locks held by syz-executor/4956: #0: ffff88807eccc460 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x28a/0xd00 fs/read_write.c:590 #1: ffff88807da38088 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1e5/0x4c0 fs/kernfs/file.c:287 #2: ffff888022e76cb8 (kn->active#360){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x208/0x4c0 fs/kernfs/file.c:288 #3: ffffffff8cb70c88 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xce/0x380 drivers/net/netdevsim/bus.c:344 #4: ffff88805167c178 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:760 [inline] #4: ffff88805167c178 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1044 [inline] #4: ffff88805167c178 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xb0/0x750 drivers/base/dd.c:1259 #5: ffff88805167d250 (&devlink->lock){+.+.}-{3:3}, at: devlink_traps_unregister+0x2d/0x230 net/core/devlink.c:11030 #6: ffffffff8c120de8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:290 [inline] #6: ffffffff8c120de8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x347/0x6b0 kernel/rcu/tree_exp.h:845 1 lock held by syz.1.39/4971: #0: ffff88801eb820e0 (&type->s_umount_key#54){.+.+}-{3:3}, at: user_get_super+0x118/0x240 fs/super.c:850 2 locks held by syz-executor/4997: #0: ffffffff8d235f48 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:72 [inline] #0: ffffffff8d235f48 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x974/0xe60 net/core/rtnetlink.c:5647 #1: ffffffff8c120de8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:322 [inline] #1: ffffffff8c120de8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x320/0x6b0 kernel/rcu/tree_exp.h:845 1 lock held by syz.3.40/5005: #0: ffff8880255da0e0 (&type->s_umount_key#54){.+.+}-{3:3}, at: user_get_super+0x118/0x240 fs/super.c:850 ============================================= NMI backtrace for cpu 1 CPU: 1 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: 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 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 9 Comm: kworker/u4:0 Not tainted 5.15.189-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 Workqueue: phy20 ieee80211_iface_work RIP: 0010:lockdep_recursion_inc kernel/locking/lockdep.c:431 [inline] RIP: 0010:lock_acquire+0x153/0x3f0 kernel/locking/lockdep.c:5622 Code: 01 00 00 41 83 3e 00 0f 85 00 01 00 00 48 c7 84 24 a0 00 00 00 00 00 00 00 9c 8f 84 24 a0 00 00 00 4c 8b b4 24 a0 00 00 00 fa <48> c7 c7 c0 23 0b 8a e8 c1 47 4c 08 65 ff 05 1a 82 a6 7e 45 31 c9 RSP: 0018:ffffc90000ce7a40 EFLAGS: 00000046 RAX: 0000000000000000 RBX: 0000000000000000 RCX: ebb35073a858c700 RDX: 0000000000000000 RSI: ffffffff8a599320 RDI: ffffffff8a5992e0 RBP: ffffc90000ce7b60 R08: dffffc0000000000 R09: fffffbfff1ad2dd6 R10: fffffbfff1ad2dd6 R11: 1ffffffff1ad2dd5 R12: ffffffff8c158398 R13: 1ffff9200019cf54 R14: 0000000000000046 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005579cecd96f0 CR3: 00000000610ba000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154 spin_lock include/linux/spinlock.h:363 [inline] kcov_remote_start+0xb0/0x4a0 kernel/kcov.c:858 kcov_remote_start_common include/linux/kcov.h:50 [inline] ieee80211_iface_work+0x1e8/0xc60 net/mac80211/iface.c:1508 process_one_work+0x863/0x1000 kernel/workqueue.c:2310 worker_thread+0xaa8/0x12a0 kernel/workqueue.c:2457 kthread+0x436/0x520 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287