INFO: task syz.8.2079:15868 blocked for more than 143 seconds. Not tainted 6.13.0-rc5-syzkaller-00012-g0bc21e701a6f #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.8.2079 state:D stack:27056 pid:15868 tgid:15861 ppid:14293 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5369 [inline] __schedule+0x1850/0x4c30 kernel/sched/core.c:6756 __schedule_loop kernel/sched/core.c:6833 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6848 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6905 rwsem_down_write_slowpath+0xeee/0x13b0 kernel/locking/rwsem.c:1176 __down_write_common kernel/locking/rwsem.c:1304 [inline] __down_write kernel/locking/rwsem.c:1313 [inline] down_write+0x1d7/0x220 kernel/locking/rwsem.c:1578 inode_lock include/linux/fs.h:818 [inline] open_last_lookups fs/namei.c:3745 [inline] path_openat+0x89a/0x3590 fs/namei.c:3984 do_filp_open+0x27f/0x4e0 fs/namei.c:4014 do_sys_openat2+0x13e/0x1d0 fs/open.c:1402 do_sys_open fs/open.c:1417 [inline] __do_sys_openat fs/open.c:1433 [inline] __se_sys_openat fs/open.c:1428 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1428 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9cecb85d29 RSP: 002b:00007f9ceda24038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f9cecd76160 RCX: 00007f9cecb85d29 RDX: 000000000000275a RSI: 0000000020000040 RDI: ffffffffffffff9c RBP: 00007f9cecc01b08 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f9cecd76160 R15: 00007ffe9a96a758 Showing all locks held in the system: 1 lock held by khungtaskd/30: #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e937ae0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6744 3 locks held by kworker/u8:5/1063: #0: ffff88801ac81148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff88801ac81148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1840 kernel/workqueue.c:3310 #1: ffffc9000408fd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc9000408fd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1840 kernel/workqueue.c:3310 #2: ffffffff8fcb2b88 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:281 2 locks held by getty/5580: #0: ffff88814d6a10a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002fde2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211 5 locks held by kworker/0:4/5891: 2 locks held by kworker/u8:10/6293: #0: ffff888140578948 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff888140578948 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1840 kernel/workqueue.c:3310 #1: ffffc9000bff7d00 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc9000bff7d00 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1840 kernel/workqueue.c:3310 2 locks held by kworker/u8:11/6814: #0: ffff888140578948 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff888140578948 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1840 kernel/workqueue.c:3310 #1: ffffc9000409fd00 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc9000409fd00 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1840 kernel/workqueue.c:3310 3 locks held by kworker/u8:13/8361: 2 locks held by syz.8.2079/15867: 2 locks held by syz.8.2079/15868: #0: ffff888057cf6420 (sb_writers#42){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:515 #1: ffff88807a550180 (&type->i_mutex_dir_key#27){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:818 [inline] #1: ffff88807a550180 (&type->i_mutex_dir_key#27){+.+.}-{4:4}, at: open_last_lookups fs/namei.c:3745 [inline] #1: ffff88807a550180 (&type->i_mutex_dir_key#27){+.+.}-{4:4}, at: path_openat+0x89a/0x3590 fs/namei.c:3984 2 locks held by syz.7.2541/17507: #0: ffffffff8fcb2b88 (rtnl_mutex){+.+.}-{4:4}, at: tun_detach drivers/net/tun.c:698 [inline] #0: ffffffff8fcb2b88 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3b/0x1b0 drivers/net/tun.c:3517 #1: ffffffff8e93cff8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: exp_funnel_lock kernel/rcu/tree_exp.h:297 [inline] #1: ffffffff8e93cff8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x381/0x830 kernel/rcu/tree_exp.h:976 1 lock held by syz.3.2547/17526: #0: ffffffff8fcb2b88 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8fcb2b88 (rtnl_mutex){+.+.}-{4:4}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6928 1 lock held by syz.3.2547/17527: #0: ffffffff8fcb2b88 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8fcb2b88 (rtnl_mutex){+.+.}-{4:4}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6928 2 locks held by syz.2.2552/17545: #0: ffff88805aea86c8 (nlk_cb_mutex-ROUTE){+.+.}-{4:4}, at: __netlink_dump_start+0x119/0x790 net/netlink/af_netlink.c:2396 #1: ffffffff8fcb2b88 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #1: ffffffff8fcb2b88 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dumpit+0x99/0x200 net/core/rtnetlink.c:6790 1 lock held by syz.4.2554/17553: #0: ffffffff8fcb2b88 (rtnl_mutex){+.+.}-{4:4}, at: dev_ioctl+0x86e/0x1340 net/core/dev_ioctl.c:807 1 lock held by syz.4.2554/17555: #0: ffffffff8fcb2b88 (rtnl_mutex){+.+.}-{4:4}, at: dev_ioctl+0x86e/0x1340 net/core/dev_ioctl.c:807 1 lock held by syz.4.2554/17557: #0: ffffffff8fcb2b88 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_lock include/linux/rtnetlink.h:128 [inline] #0: ffffffff8fcb2b88 (rtnl_mutex){+.+.}-{4:4}, at: inet_rtm_deladdr+0x1a1/0x7b0 net/ipv4/devinet.c:679 1 lock held by syz.0.2557/17565: #0: ffffffff8fcb2b88 (rtnl_mutex){+.+.}-{4:4}, at: tcx_prog_query+0x8a/0x140 kernel/bpf/tcx.c:129 2 locks held by syz.0.2557/17566: #0: ffffffff8fd155d0 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40 net/netlink/genetlink.c:1218 #1: ffffffff8fcb2b88 (rtnl_mutex){+.+.}-{4:4}, at: ethnl_default_set_doit+0x394/0x910 net/ethtool/netlink.c:689 2 locks held by syz.0.2557/17567: #0: ffffffff9019ba70 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff9019ba70 (&ops->srcu#2){.+.+}-{0:0}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff9019ba70 (&ops->srcu#2){.+.+}-{0:0}, at: rtnl_link_ops_get+0x22/0x250 net/core/rtnetlink.c:555 #1: ffffffff8fcb2b88 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #1: ffffffff8fcb2b88 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock net/core/rtnetlink.c:326 [inline] #1: ffffffff8fcb2b88 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0xce2/0x2210 net/core/rtnetlink.c:4011 1 lock held by syz.5.2560/17581: #0: ffffffff8fcb2b88 (rtnl_mutex){+.+.}-{4:4}, at: wext_ioctl_dispatch+0x102/0x530 net/wireless/wext-core.c:1015 ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.13.0-rc5-syzkaller-00012-g0bc21e701a6f #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+0x241/0x360 lib/dump_stack.c:120 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x198/0x320 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+0xff6/0x1040 kernel/hung_task.c:397 kthread+0x2f2/0x390 kernel/kthread.c:389 ret_from_fork+0x4d/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 15867 Comm: syz.8.2079 Not tainted 6.13.0-rc5-syzkaller-00012-g0bc21e701a6f #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:preempt_count_add+0x4/0x190 kernel/sched/core.c:5838 Code: 7c 97 48 8b 3c 24 e8 0b 5b 98 00 eb 8c e9 ee fe ff ff 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa <41> 57 41 56 53 89 fb 48 c7 c0 c0 b9 3a 9a 48 c1 e8 03 49 bf 00 00 RSP: 0018:ffffc90002fc59b8 EFLAGS: 00000002 RAX: 0000000000000001 RBX: 1ffff920005f8b3c RCX: ffffffff81a72ecc RDX: 0000000000000000 RSI: ffffffff8c5fb0c0 RDI: 0000000000000001 RBP: ffffc90002fc5a50 R08: ffffffff90197e77 R09: 1ffffffff2032fce R10: dffffc0000000000 R11: fffffbfff2032fcf R12: 0000000000000246 R13: 1ffff920005f8b38 R14: ffffffff9a640228 R15: dffffc0000000000 FS: 00007f9ceda456c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f5d71adbfe4 CR3: 000000005ced8000 CR4: 0000000000350ef0 Call Trace: __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:109 [inline] _raw_spin_lock_irqsave+0xba/0x120 kernel/locking/spinlock.c:162 __debug_check_no_obj_freed lib/debugobjects.c:1088 [inline] debug_check_no_obj_freed+0x234/0x580 lib/debugobjects.c:1129 slab_free_hook mm/slub.c:2284 [inline] slab_free mm/slub.c:4613 [inline] kmem_cache_free+0x114/0x410 mm/slub.c:4715 free_buffer_head+0x54/0x240 fs/buffer.c:3031 try_to_free_buffers+0x2fa/0x3b0 fs/buffer.c:2972 shrink_folio_list+0x241e/0x5ca0 mm/vmscan.c:1433 evict_folios+0x3c86/0x5800 mm/vmscan.c:4593 try_to_shrink_lruvec+0x9a6/0xc70 mm/vmscan.c:4789 lru_gen_shrink_lruvec mm/vmscan.c:4938 [inline] shrink_lruvec+0x53c/0x3160 mm/vmscan.c:5693 shrink_node_memcgs mm/vmscan.c:5929 [inline] shrink_node+0xb15/0x3e50 mm/vmscan.c:5970 shrink_zones mm/vmscan.c:6215 [inline] do_try_to_free_pages+0x78c/0x1cf0 mm/vmscan.c:6277 try_to_free_mem_cgroup_pages+0x48c/0xab0 mm/vmscan.c:6609 try_charge_memcg+0x8c7/0x1150 mm/memcontrol.c:2238 obj_cgroup_charge_pages+0x91/0x230 mm/memcontrol.c:2646 obj_cgroup_charge+0x380/0x5d0 mm/memcontrol.c:2937 __memcg_slab_post_alloc_hook+0x1b1/0x7e0 mm/memcontrol.c:2998 memcg_slab_post_alloc_hook mm/slub.c:2152 [inline] slab_post_alloc_hook mm/slub.c:4129 [inline] slab_alloc_node mm/slub.c:4168 [inline] kmem_cache_alloc_noprof+0x287/0x380 mm/slub.c:4175 alloc_buffer_head+0x2a/0x290 fs/buffer.c:3015 folio_alloc_buffers+0x31f/0x640 fs/buffer.c:924 create_empty_buffers+0x3a/0x530 fs/buffer.c:1662 block_read_full_folio+0x244/0xae0 fs/buffer.c:2377 filemap_read_folio+0x14a/0x3b0 mm/filemap.c:2366 do_read_cache_folio+0x373/0x5b0 mm/filemap.c:3826 read_mapping_folio include/linux/pagemap.h:1011 [inline] dir_get_folio fs/sysv/dir.c:64 [inline] sysv_find_entry+0x16c/0x590 fs/sysv/dir.c:154 sysv_inode_by_name+0x98/0x2a0 fs/sysv/dir.c:370 sysv_lookup+0x6b/0xe0 fs/sysv/namei.c:38 lookup_one_qstr_excl+0x121/0x260 fs/namei.c:1692 filename_create+0x297/0x540 fs/namei.c:4081 do_mkdirat+0xbd/0x3a0 fs/namei.c:4326 __do_sys_mkdirat fs/namei.c:4349 [inline] __se_sys_mkdirat fs/namei.c:4347 [inline] __x64_sys_mkdirat+0x87/0xa0 fs/namei.c:4347 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f9cecb84597 Code: 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 02 01 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f9ceda44e68 EFLAGS: 00000246 ORIG_RAX: 0000000000000102 RAX: ffffffffffffffda RBX: 00007f9ceda44ef0 RCX: 00007f9cecb84597 RDX: 00000000000001ff RSI: 0000000020002080 RDI: 00000000ffffff9c RBP: 0000000020002040 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000020002040 R11: 0000000000000246 R12: 0000000020002080 R13: 00007f9ceda44eb0 R14: 0000000000000000 R15: 0000000020000080