INFO: task kworker/u4:6:2400 blocked for more than 143 seconds. Not tainted 6.8.0-rc2-next-20240202-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u4:6 state:D stack:22576 pid:2400 tgid:2400 ppid:2 flags:0x00004000 Workqueue: netns cleanup_net Call Trace: context_switch kernel/sched/core.c:5400 [inline] __schedule+0x17df/0x4a40 kernel/sched/core.c:6727 __schedule_loop kernel/sched/core.c:6804 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6819 schedule_timeout+0xb0/0x310 kernel/time/timer.c:2159 do_wait_for_common kernel/sched/completion.c:95 [inline] __wait_for_common kernel/sched/completion.c:116 [inline] wait_for_common kernel/sched/completion.c:127 [inline] wait_for_completion+0x355/0x620 kernel/sched/completion.c:148 __flush_workqueue+0x730/0x1630 kernel/workqueue.c:3617 drain_workqueue+0xc9/0x390 kernel/workqueue.c:3730 destroy_workqueue+0xba/0xc40 kernel/workqueue.c:5319 bond_destructor+0x4d/0x80 drivers/net/bonding/bond_main.c:5846 netdev_run_todo+0xd4f/0xf40 net/core/dev.c:10581 default_device_exit_batch+0x975/0x9f0 net/core/dev.c:11625 ops_exit_list net/core/net_namespace.c:175 [inline] cleanup_net+0x775/0xb90 net/core/net_namespace.c:618 process_one_work kernel/workqueue.c:3049 [inline] process_scheduled_works+0x913/0x14f0 kernel/workqueue.c:3125 worker_thread+0xa60/0x1000 kernel/workqueue.c:3206 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242 Showing all locks held in the system: 3 locks held by kworker/0:0/7: #0: ffff888029e84d48 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3024 [inline] #0: ffff888029e84d48 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x14f0 kernel/workqueue.c:3125 #1: ffff8880b9428988 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x441/0x770 kernel/sched/psi.c:988 #2: ffff88807d3c8538 (&idev->mc_lock){+.+.}-{3:3}, at: mld_ifc_work+0x2d/0xb30 net/ipv6/mcast.c:2649 3 locks held by kworker/0:1/8: #0: ffff888029e84d48 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3024 [inline] #0: ffff888029e84d48 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x14f0 kernel/workqueue.c:3125 #1: ffffc900000d7d20 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3024 [inline] #1: ffffc900000d7d20 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x14f0 kernel/workqueue.c:3125 #2: ffff8880b9429698 (&base->lock){-.-.}-{2:2}, at: lock_timer_base+0x120/0x260 kernel/time/timer.c:999 4 locks held by kworker/u4:1/11: #0: ffff88802e74e148 ((wq_completion)ext4-rsv-conversion){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3024 [inline] #0: ffff88802e74e148 ((wq_completion)ext4-rsv-conversion){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x14f0 kernel/workqueue.c:3125 #1: ffffc90000107d20 ((work_completion)(&ei->i_rsv_conversion_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3024 [inline] #1: ffffc90000107d20 ((work_completion)(&ei->i_rsv_conversion_work)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x14f0 kernel/workqueue.c:3125 #2: ffffffff8e130d60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline] #2: ffffffff8e130d60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline] #2: ffffffff8e130d60 (rcu_read_lock){....}-{1:2}, at: folio_memcg_lock+0x89/0x390 mm/memcontrol.c:2196 #3: ffff8880b953c758 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:559 1 lock held by khungtaskd/29: #0: ffffffff8e130d60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:298 [inline] #0: ffffffff8e130d60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:750 [inline] #0: ffffffff8e130d60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6614 3 locks held by kworker/u4:2/34: 2 locks held by kworker/1:1/44: #0: ffff8880b953c758 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:559 #1: ffff8880b9528988 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x441/0x770 kernel/sched/psi.c:988 3 locks held by kworker/u4:6/2400: #0: ffff888015acd948 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3024 [inline] #0: ffff888015acd948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x14f0 kernel/workqueue.c:3125 #1: ffffc90009ed7d20 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3024 [inline] #1: ffffc90009ed7d20 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x14f0 kernel/workqueue.c:3125 #2: ffffffff8f36da50 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0xf5/0xb90 net/core/net_namespace.c:580 2 locks held by getty/4818: #0: ffff88802a3d50a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f162f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6b5/0x1e10 drivers/tty/n_tty.c:2201 4 locks held by syz-executor.0/5075: 3 locks held by kworker/0:3/5123: #0: ffff888014c7cd48 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3024 [inline] #0: ffff888014c7cd48 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x14f0 kernel/workqueue.c:3125 #1: ffffc900039ffd20 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3024 [inline] #1: ffffc900039ffd20 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0x825/0x14f0 kernel/workqueue.c:3125 #2: ffff88805d1d7240 (&data->fib_lock){+.+.}-{3:3}, at: nsim_fib_event_work+0x2d1/0x4130 drivers/net/netdevsim/fib.c:1489 3 locks held by syz-executor.2/10593: #0: ffffffff8f379fc8 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8f379fc8 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x82c/0x1040 net/core/rtnetlink.c:6612 #1: ffff8880566f93e8 (&wg->device_update_lock){+.+.}-{3:3}, at: wg_open+0x22d/0x420 drivers/net/wireguard/device.c:50 #2: ffffffff8e1360f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:291 [inline] #2: ffffffff8e1360f8 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x39a/0x820 kernel/rcu/tree_exp.h:939 1 lock held by syz-executor.0/10689: 1 lock held by syz-executor.0/10723: 1 lock held by syz-executor.1/10728: 3 locks held by syz-executor.0/10740: 3 locks held by syz-executor.4/10742: #0: ffff88807b884420 (sb_writers#4){.+.+}-{0:0}, at: do_coredump+0x1b79/0x2b50 fs/coredump.c:763 #1: ffff88803a719800 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:802 [inline] #1: ffff88803a719800 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: ext4_buffered_write_iter+0x97/0x350 fs/ext4/file.c:294 #2: ffff88807b8840e0 (&type->s_umount_key#31){++++}-{3:3}, at: try_to_writeback_inodes_sb+0x21/0xc0 fs/fs-writeback.c:2742 3 locks held by syz-executor.1/10747: 2 locks held by syz-executor.0/10749: 1 lock held by syz-executor.1/10754: 2 locks held by syz-executor.4/10756: 3 locks held by syz-executor.1/10761: 2 locks held by syz-executor.0/10760: 4 locks held by syz-executor.1/10765: 2 locks held by syz-executor.1/10775: 3 locks held by syz-executor.4/10777: 4 locks held by syz-executor.0/10779: 2 locks held by syz-executor.1/10788: 4 locks held by syz-executor.4/10793: 3 locks held by syz-executor.0/10802: 2 locks held by syz-executor.1/10806: 4 locks held by syz-executor.4/10808: 4 locks held by syz-executor.1/10824: 3 locks held by syz-executor.0/10828: 2 locks held by syz-executor.4/10825: 4 locks held by syz-executor.4/10837: 3 locks held by syz-executor.1/10838: 2 locks held by syz-executor.1/10848: 2 locks held by syz-executor.0/10850: 2 locks held by syz-executor.4/10851: 3 locks held by syz-executor.3/10855: 4 locks held by syz-executor.3/10861: 5 locks held by syz-executor.0/10866: 4 locks held by syz-executor.3/10868: 4 locks held by syz-executor.4/10872: 3 locks held by syz-executor.3/10874: 2 locks held by syz-executor.4/10897: 2 locks held by syz-executor.0/10904: 5 locks held by syz-executor.1/10912: 1 lock held by syz-executor.0/10919: 3 locks held by syz-executor.4/10916: ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 29 Comm: khungtaskd Not tainted 6.8.0-rc2-next-20240202-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2e0 lib/dump_stack.c:106 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:160 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline] watchdog+0xfb0/0xff0 kernel/hung_task.c:379 kthread+0x2f0/0x390 kernel/kthread.c:388 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:242 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 10850 Comm: syz-executor.0 Not tainted 6.8.0-rc2-next-20240202-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/25/2024 RIP: 0010:check_kcov_mode kernel/kcov.c:184 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x70 kernel/kcov.c:207 Code: 00 bd 03 00 65 8b 15 70 ec 6f 7e f7 c2 00 01 ff 00 74 11 f7 c2 00 01 00 00 74 35 83 b9 14 16 00 00 00 74 2c 8b 91 f0 15 00 00 <83> fa 02 75 21 48 8b 91 f8 15 00 00 48 8b 32 48 8d 7e 01 8b 89 f4 RSP: 0018:ffffc9000dd4e758 EFLAGS: 00000046 RAX: ffffffff818c3fb7 RBX: 0000000000000001 RCX: ffff888021af1e00 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000008 RBP: 0000000000000001 R08: ffffffff818c3fa9 R09: 1ffffffff1f0b6e5 R10: dffffc0000000000 R11: fffffbfff1f0b6e6 R12: dffffc0000000000 R13: dffffc0000000000 R14: 0000000000000001 R15: ffff88801118a000 FS: 00007f2b856fc6c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f8048fa8000 CR3: 00000000613b8000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: cgroup_rstat_updated+0x47/0x360 kernel/cgroup/rstat.c:31 memcg_rstat_updated+0x4d/0x310 mm/memcontrol.c:723 __mod_memcg_state mm/memcontrol.c:825 [inline] mod_memcg_state include/linux/memcontrol.h:1003 [inline] memcg_account_kmem+0x112/0x210 mm/memcontrol.c:3260 obj_cgroup_charge_pages mm/memcontrol.c:3308 [inline] obj_cgroup_charge+0x39b/0x630 mm/memcontrol.c:3595 __memcg_slab_pre_alloc_hook+0x28d/0x2b0 mm/slub.c:1930 memcg_slab_pre_alloc_hook mm/slub.c:1951 [inline] slab_pre_alloc_hook mm/slub.c:3767 [inline] slab_alloc_node mm/slub.c:3843 [inline] kmem_cache_alloc+0x205/0x350 mm/slub.c:3868 kmem_cache_zalloc include/linux/slab.h:701 [inline] alloc_buffer_head+0x2d/0x2a0 fs/buffer.c:2997 folio_alloc_buffers+0x2da/0x840 fs/buffer.c:924 create_empty_buffers+0x3a/0x740 fs/buffer.c:1650 ext4_block_write_begin+0x27d/0x1850 fs/ext4/inode.c:1036 ext4_da_write_begin+0x5e8/0xa50 fs/ext4/inode.c:2900 generic_perform_write+0x322/0x640 mm/filemap.c:3921 ext4_buffered_write_iter+0xc6/0x350 fs/ext4/file.c:299 ext4_file_write_iter+0x1de/0x1a10 __kernel_write_iter+0x435/0x8c0 fs/read_write.c:523 dump_emit_page fs/coredump.c:888 [inline] dump_user_range+0x46d/0x910 fs/coredump.c:915 elf_core_dump+0x3d5e/0x4630 fs/binfmt_elf.c:2077 do_coredump+0x1bab/0x2b50 fs/coredump.c:764 get_signal+0x146b/0x1850 kernel/signal.c:2882 arch_do_signal_or_restart+0x96/0x860 arch/x86/kernel/signal.c:310 exit_to_user_mode_loop kernel/entry/common.c:105 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] irqentry_exit_to_user_mode+0x79/0x280 kernel/entry/common.c:225 exc_general_protection+0x410/0x5d0 arch/x86/kernel/traps.c:644 asm_exc_general_protection+0x26/0x30 arch/x86/include/asm/idtentry.h:617 RIP: 0033:0x7f2b84a7ddb1 Code: c4 28 c3 e8 e1 20 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 48 3d 01 f0 ff ff 73 01 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f RSP: 002b:0000000020000280 EFLAGS: 00010217 RAX: 0000000000000000 RBX: 00007f2b84babf80 RCX: 00007f2b84a7dda9 RDX: 0000000020000300 RSI: 0000000020000280 RDI: 0000000000001000 RBP: 00007f2b84aca47a R08: 0000000020000380 R09: 0000000020000380 R10: 0000000020000340 R11: 0000000000000206 R12: 0000000000000000 R13: 000000000000000b R14: 00007f2b84babf80 R15: 00007fffb440b498