INFO: task kworker/u8:6:1067 blocked for more than 143 seconds. Not tainted 6.11.0-syzkaller-11993-g3efc57369a0c #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:6 state:D stack:19224 pid:1067 tgid:1067 ppid:2 flags:0x00004000 Workqueue: writeback wb_workfn (flush-bcachefs-6) Call Trace: context_switch kernel/sched/core.c:5315 [inline] __schedule+0x1843/0x4ae0 kernel/sched/core.c:6675 __schedule_loop kernel/sched/core.c:6752 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6767 io_schedule+0x8d/0x110 kernel/sched/core.c:7552 folio_wait_bit_common+0x882/0x12b0 mm/filemap.c:1309 folio_lock include/linux/pagemap.h:1148 [inline] writeback_get_folio mm/page-writeback.c:2496 [inline] writeback_iter+0x992/0x18d0 mm/page-writeback.c:2590 write_cache_pages+0xb1/0x230 mm/page-writeback.c:2639 bch2_writepages+0x14f/0x380 fs/bcachefs/fs-io-buffered.c:639 do_writepages+0x35d/0x870 mm/page-writeback.c:2683 __writeback_single_inode+0x14f/0x10d0 fs/fs-writeback.c:1658 writeback_sb_inodes+0x80c/0x1370 fs/fs-writeback.c:1954 __writeback_inodes_wb+0x11b/0x260 fs/fs-writeback.c:2025 wb_writeback+0x42f/0xbd0 fs/fs-writeback.c:2136 wb_check_background_flush fs/fs-writeback.c:2206 [inline] wb_do_writeback fs/fs-writeback.c:2294 [inline] wb_workfn+0xc58/0x1090 fs/fs-writeback.c:2321 process_one_work kernel/workqueue.c:3229 [inline] process_scheduled_works+0xa63/0x1850 kernel/workqueue.c:3310 worker_thread+0x870/0xd30 kernel/workqueue.c:3391 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 INFO: task syz.4.63:5695 blocked for more than 144 seconds. Not tainted 6.11.0-syzkaller-11993-g3efc57369a0c #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.63 state:D stack:21216 pid:5695 tgid:5670 ppid:5231 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5315 [inline] __schedule+0x1843/0x4ae0 kernel/sched/core.c:6675 __schedule_loop kernel/sched/core.c:6752 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6767 io_schedule+0x8d/0x110 kernel/sched/core.c:7552 folio_wait_bit_common+0x882/0x12b0 mm/filemap.c:1309 folio_wait_writeback+0xe7/0x1e0 mm/page-writeback.c:3189 truncate_inode_partial_folio+0x9e/0x850 mm/truncate.c:208 truncate_inode_pages_range+0x60a/0xfc0 mm/truncate.c:354 truncate_inode_pages mm/truncate.c:423 [inline] truncate_pagecache mm/truncate.c:727 [inline] truncate_setsize+0xcf/0xf0 mm/truncate.c:752 bchfs_truncate+0x6df/0xc70 fs/bcachefs/fs-io.c:441 notify_change+0xbca/0xe90 fs/attr.c:503 do_truncate fs/open.c:65 [inline] do_ftruncate+0x462/0x580 fs/open.c:181 do_sys_ftruncate fs/open.c:199 [inline] __do_sys_ftruncate fs/open.c:207 [inline] __se_sys_ftruncate fs/open.c:205 [inline] __x64_sys_ftruncate+0x95/0xf0 fs/open.c:205 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: 0033:0x7f96fcb7dff9 RSP: 002b:00007f96fd8b5038 EFLAGS: 00000246 ORIG_RAX: 000000000000004d RAX: ffffffffffffffda RBX: 00007f96fcd36058 RCX: 00007f96fcb7dff9 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000004 RBP: 00007f96fcbf0296 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f96fcd36058 R15: 00007ffd7761a3a8 Showing all locks held in the system: 1 lock held by ksoftirqd/0/16: 1 lock held by khungtaskd/30: #0: ffffffff8e937da0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e937da0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e937da0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6701 3 locks held by kworker/u8:3/53: 3 locks held by kworker/u8:4/76: #0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff88801ac89148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310 #1: ffffc900020afd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc900020afd00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310 #2: ffffffff8fcbefc8 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:276 3 locks held by kworker/u8:6/1067: #0: ffff88801da99148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff88801da99148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310 #1: ffffc90004087d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc90004087d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310 #2: ffff88805650c0e0 (&type->s_umount_key#92){++++}-{3:3}, at: super_trylock_shared+0x22/0xf0 fs/super.c:562 2 locks held by getty/4973: #0: ffff888032db20a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211 3 locks held by kworker/0:4/5268: #0: ffff8880b863ea58 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:593 #1: ffff8880b8628948 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x441/0x770 kernel/sched/psi.c:989 #2: ffff88806d704538 (&idev->mc_lock){+.+.}-{3:3}, at: mld_dad_work+0x3c/0x500 net/ipv6/mcast.c:2259 3 locks held by kworker/0:5/5298: #0: ffff88801ac80948 ((wq_completion)events){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff88801ac80948 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310 #1: ffffc90004297d00 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc90004297d00 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310 #2: ffff888063e35240 (&data->fib_lock){+.+.}-{3:3}, at: nsim_fib_event_work+0x2d1/0x4130 drivers/net/netdevsim/fib.c:1488 2 locks held by syz.4.63/5671: #0: ffff888028956d38 (&f->f_pos_lock){+.+.}-{3:3}, at: fdget_pos+0x24e/0x320 fs/file.c:1187 #1: ffff88805650c420 (sb_writers#27){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2931 [inline] #1: ffff88805650c420 (sb_writers#27){.+.+}-{0:0}, at: vfs_writev+0x2d1/0xba0 fs/read_write.c:1062 2 locks held by syz.4.63/5695: #0: ffff88805650c420 (sb_writers#27){.+.+}-{0:0}, at: do_ftruncate+0x28b/0x580 fs/open.c:178 #1: ffff88805c8c88c0 (&sb->s_type->i_mutex_key#30){++++}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline] #1: ffff88805c8c88c0 (&sb->s_type->i_mutex_key#30){++++}-{3:3}, at: do_truncate fs/open.c:63 [inline] #1: ffff88805c8c88c0 (&sb->s_type->i_mutex_key#30){++++}-{3:3}, at: do_ftruncate+0x44e/0x580 fs/open.c:181 2 locks held by kworker/u8:10/5895: 6 locks held by kworker/u8:11/6329: #0: ffff88801baeb148 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff88801baeb148 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310 #1: ffffc9000318fd00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc9000318fd00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310 #2: ffffffff8fcb24d0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x16a/0xcc0 net/core/net_namespace.c:580 #3: ffff88807abd70e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1014 [inline] #3: ffff88807abd70e8 (&dev->mutex){....}-{3:3}, at: devl_dev_lock net/devlink/devl_internal.h:108 [inline] #3: ffff88807abd70e8 (&dev->mutex){....}-{3:3}, at: devlink_pernet_pre_exit+0x13b/0x440 net/devlink/core.c:506 #4: ffff88807abd5250 (&devlink->lock_key#18){+.+.}-{3:3}, at: devl_lock net/devlink/core.c:276 [inline] #4: ffff88807abd5250 (&devlink->lock_key#18){+.+.}-{3:3}, at: devl_dev_lock net/devlink/devl_internal.h:109 [inline] #4: ffff88807abd5250 (&devlink->lock_key#18){+.+.}-{3:3}, at: devlink_pernet_pre_exit+0x14d/0x440 net/devlink/core.c:506 #5: ffffffff8e93d200 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x4c/0x530 kernel/rcu/tree.c:4561 2 locks held by syz-executor/6453: #0: ffff88805dd860e0 (&type->s_umount_key#92){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff88805dd860e0 (&type->s_umount_key#92){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff88805dd860e0 (&type->s_umount_key#92){++++}-{3:3}, at: deactivate_super+0xb5/0xf0 fs/super.c:505 #1: ffff88804f900278 (&c->state_lock){+.+.}-{3:3}, at: __bch2_fs_stop+0xfd/0x540 fs/bcachefs/super.c:618 1 lock held by syz.4.159/6480: #0: ffff88805650c0e0 (&type->s_umount_key#92){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff88805650c0e0 (&type->s_umount_key#92){++++}-{3:3}, at: super_lock+0x196/0x400 fs/super.c:120 1 lock held by syz.4.260/7163: #0: ffff88805650c0e0 (&type->s_umount_key#92){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88805650c0e0 (&type->s_umount_key#92){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz-executor/7368: #0: ffffffff8e93d338 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:329 [inline] #0: ffffffff8e93d338 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:976 1 lock held by syz.1.304/7465: #0: ffff88805dd860e0 (&type->s_umount_key#92){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88805dd860e0 (&type->s_umount_key#92){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 1 lock held by syz-executor/7664: #0: ffffffff8fcb24d0 (pernet_ops_rwsem){++++}-{3:3}, at: copy_net_ns+0x328/0x570 net/core/net_namespace.c:490 1 lock held by syz.3.331/7672: 1 lock held by syz-executor/7675: #0: ffffffff8e93d338 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:329 [inline] #0: ffffffff8e93d338 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:976 2 locks held by sed/7697: ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-syzkaller-11993-g3efc57369a0c #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:223 [inline] watchdog+0xff4/0x1040 kernel/hung_task.c:379 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/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: 7697 Comm: sed Not tainted 6.11.0-syzkaller-11993-g3efc57369a0c #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:cgroup_rstat_updated+0x126/0xc60 kernel/cgroup/rstat.c:98 Code: 44 24 48 42 80 3c 38 00 74 08 4c 89 ef e8 d2 0f 6e 00 49 8b 45 00 48 8d 9c 18 88 00 00 00 48 89 d8 48 c1 e8 03 42 80 3c 38 00 <74> 08 48 89 df e8 b0 0f 6e 00 48 83 3b 00 74 0a e8 15 80 07 00 e9 RSP: 0000:ffffc90004c0f9a0 EFLAGS: 00000046 RAX: 1ffffd1ffff83253 RBX: ffffe8ffffc19298 RCX: ffff88805150da00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000008 RBP: ffffc90004c0faa8 R08: ffffffff818d6514 R09: 1ffffffff20376f5 R10: dffffc0000000000 R11: fffffbfff20376f6 R12: ffff88802c6d0040 R13: ffffffff8e307a50 R14: 1ffff92000981f40 R15: dffffc0000000000 FS: 00007f512e70d380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f512e95a000 CR3: 000000004b5ac000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: memcg_rstat_updated+0x4d/0x2f0 mm/memcontrol.c:568 __count_memcg_events+0x189/0x290 mm/memcontrol.c:832 count_memcg_events include/linux/memcontrol.h:1022 [inline] count_memcg_events_mm include/linux/memcontrol.h:1045 [inline] count_memcg_event_mm+0x231/0x420 include/linux/memcontrol.h:1052 mm_account_fault mm/memory.c:5928 [inline] handle_mm_fault+0x1624/0x1ad0 mm/memory.c:6088 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x459/0x8c0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0033:0x7f512e95a000 Code: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <48> 83 ec 08 48 8b 05 7d 2f 0b 00 48 85 c0 74 02 ff d0 e8 27 19 00 RSP: 002b:00007fff18e50c38 EFLAGS: 00010206 RAX: 00007f512e95a000 RBX: 00007f512ea0e0c0 RCX: 00007fff18e50cf0 RDX: 00007fff18e50cf0 RSI: 00007fff18e50cc8 RDI: 0000000000000004 RBP: 0000000000000000 R08: 0000000000000000 R09: 160d3fecc4872f76 R10: 000000000000004f R11: 0000000000000246 R12: 0000000000000004 R13: 00007fff18e50cc8 R14: 00007fff18e50cf0 R15: 0000000000000000