INFO: task kworker/u8:2:35 blocked for more than 143 seconds. Not tainted 6.12.0-rc7-syzkaller-00012-g3022e9d00ebe #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:kworker/u8:2 state:D stack:19312 pid:35 tgid:35 ppid:2 flags:0x00004000 Workqueue: writeback wb_workfn (flush-bcachefs-27) Call Trace: context_switch kernel/sched/core.c:5328 [inline] __schedule+0x17fa/0x4bd0 kernel/sched/core.c:6693 __schedule_loop kernel/sched/core.c:6770 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6785 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2615 __closure_sync_timeout+0x2d8/0x450 lib/closure.c:217 closure_sync_timeout include/linux/closure.h:206 [inline] __bch2_wait_on_allocator+0x11a/0x250 fs/bcachefs/alloc_foreground.c:1812 bch2_wait_on_allocator fs/bcachefs/alloc_foreground.h:239 [inline] __bch2_write+0x562a/0x5dd0 fs/bcachefs/io_write.c:1501 bch2_write+0x9b5/0x1760 fs/bcachefs/io_write.c:1631 closure_queue include/linux/closure.h:270 [inline] closure_call include/linux/closure.h:432 [inline] bch2_writepage_do_io fs/bcachefs/fs-io-buffered.c:449 [inline] bch2_writepages+0x27d/0x380 fs/bcachefs/fs-io-buffered.c:641 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 wb_writeback+0x41b/0xbd0 fs/fs-writeback.c:2134 wb_do_writeback fs/fs-writeback.c:2281 [inline] wb_workfn+0x410/0x1090 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-executor:5848 blocked for more than 144 seconds. Not tainted 6.12.0-rc7-syzkaller-00012-g3022e9d00ebe #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor state:D stack:20816 pid:5848 tgid:5848 ppid:1 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5328 [inline] __schedule+0x17fa/0x4bd0 kernel/sched/core.c:6693 __schedule_loop kernel/sched/core.c:6770 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6785 wb_wait_for_completion+0x166/0x290 fs/fs-writeback.c:216 __writeback_inodes_sb_nr+0x2d2/0x380 fs/fs-writeback.c:2713 sync_filesystem+0xa4/0x230 fs/sync.c:54 generic_shutdown_super+0x72/0x2d0 fs/super.c:621 bch2_kill_sb+0x41/0x50 fs/bcachefs/fs.c:2278 deactivate_locked_super+0xc4/0x130 fs/super.c:473 cleanup_mnt+0x41f/0x4b0 fs/namespace.c:1373 task_work_run+0x24f/0x310 kernel/task_work.c:239 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop kernel/entry/common.c:114 [inline] exit_to_user_mode_prepare include/linux/entry-common.h:328 [inline] __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline] syscall_exit_to_user_mode+0x168/0x370 kernel/entry/common.c:218 do_syscall_64+0x100/0x230 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7054b7fa47 RSP: 002b:00007ffdfe3f2188 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 00007f7054b7fa47 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007ffdfe3f2240 RBP: 00007ffdfe3f2240 R08: 0000000000000000 R09: 0000000000000000 R10: 00000000ffffffff R11: 0000000000000246 R12: 00007ffdfe3f32c0 R13: 00007f7054bf14b4 R14: 0000000000024481 R15: 00007ffdfe3f3300 INFO: task bch-copygc/loop:7427 blocked for more than 144 seconds. Not tainted 6.12.0-rc7-syzkaller-00012-g3022e9d00ebe #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:bch-copygc/loop state:D stack:19696 pid:7427 tgid:7427 ppid:2 flags:0x00004000 Call Trace: context_switch kernel/sched/core.c:5328 [inline] __schedule+0x17fa/0x4bd0 kernel/sched/core.c:6693 __schedule_loop kernel/sched/core.c:6770 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6785 schedule_timeout+0x1be/0x310 kernel/time/timer.c:2615 __closure_sync_timeout+0x2d8/0x450 lib/closure.c:217 closure_sync_timeout include/linux/closure.h:206 [inline] __bch2_wait_on_allocator+0x11a/0x250 fs/bcachefs/alloc_foreground.c:1812 bch2_wait_on_allocator fs/bcachefs/alloc_foreground.h:239 [inline] __bch2_write+0x562a/0x5dd0 fs/bcachefs/io_write.c:1501 bch2_write+0x9b5/0x1760 fs/bcachefs/io_write.c:1631 closure_queue include/linux/closure.h:270 [inline] closure_call include/linux/closure.h:432 [inline] bch2_data_update_read_done+0x22e/0x330 fs/bcachefs/data_update.c:426 move_write fs/bcachefs/move.c:133 [inline] bch2_moving_ctxt_do_pending_writes+0x44c/0x8d0 fs/bcachefs/move.c:164 move_buckets_wait+0x2ba/0x1290 fs/bcachefs/movinggc.c:120 bch2_copygc_thread+0x83f/0xc20 fs/bcachefs/movinggc.c:392 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 Showing all locks held in the system: 1 lock held by pool_workqueue_/3: 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:6720 2 locks held by kworker/u8:2/35: #0: ffff8881412e2148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff8881412e2148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310 #1: ffffc90000ab7d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc90000ab7d00 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310 5 locks held by kworker/u8:3/53: #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: ffffc90000be7d00 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc90000be7d00 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310 #2: ffffffff8fcb48d0 (pernet_ops_rwsem){++++}-{3:3}, at: cleanup_net+0x16a/0xcc0 net/core/net_namespace.c:580 #3: ffffffff8fcc1408 (rtnl_mutex){+.+.}-{3:3}, at: default_device_exit_batch+0xe9/0xaa0 net/core/dev.c:11938 #4: ffffffff8e93d338 (rcu_state.exp_mutex){+.+.}-{3:3}, at: exp_funnel_lock kernel/rcu/tree_exp.h:329 [inline] #4: ffffffff8e93d338 (rcu_state.exp_mutex){+.+.}-{3:3}, at: synchronize_rcu_expedited+0x451/0x830 kernel/rcu/tree_exp.h:976 3 locks held by kworker/u8:4/62: #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: ffffc900015e7d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc900015e7d00 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310 #2: ffffffff8fcc1408 (rtnl_mutex){+.+.}-{3:3}, at: linkwatch_event+0xe/0x60 net/core/link_watch.c:276 5 locks held by kworker/u8:7/3451: 2 locks held by dhcpcd/5501: #0: ffff88807ce4c6c8 (nlk_cb_mutex-ROUTE){+.+.}-{3:3}, at: netlink_dump+0xcb/0xd80 net/netlink/af_netlink.c:2272 #1: ffffffff8fcc1408 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #1: ffffffff8fcc1408 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_dumpit+0x99/0x200 net/core/rtnetlink.c:6534 2 locks held by getty/5590: #0: ffff888035c080a0 (&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 2 locks held by syz-executor/5838: #0: ffff8880601ec0e0 (&type->s_umount_key#70){++++}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff8880601ec0e0 (&type->s_umount_key#70){++++}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff8880601ec0e0 (&type->s_umount_key#70){++++}-{3:3}, at: deactivate_super+0xb5/0xf0 fs/super.c:505 #1: ffffffff8e9f91e8 (lock#3){+.+.}-{3:3}, at: __lru_add_drain_all+0x66/0x560 mm/swap.c:843 1 lock held by syz-executor/5848: #0: ffff8880279d20e0 (&type->s_umount_key#63){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff8880279d20e0 (&type->s_umount_key#63){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff8880279d20e0 (&type->s_umount_key#63){+.+.}-{3:3}, at: deactivate_super+0xb5/0xf0 fs/super.c:505 3 locks held by syz-executor/6202: #0: ffff888031ede0e0 (&type->s_umount_key#60){+.+.}-{3:3}, at: __super_lock fs/super.c:56 [inline] #0: ffff888031ede0e0 (&type->s_umount_key#60){+.+.}-{3:3}, at: __super_lock_excl fs/super.c:71 [inline] #0: ffff888031ede0e0 (&type->s_umount_key#60){+.+.}-{3:3}, at: deactivate_super+0xb5/0xf0 fs/super.c:505 #1: ffffffff8eec2f08 (uuid_mutex){+.+.}-{3:3}, at: btrfs_close_devices+0xc0/0x5c0 fs/btrfs/volumes.c:1161 #2: ffffffff8e9f91e8 (lock#3){+.+.}-{3:3}, at: __lru_add_drain_all+0x66/0x560 mm/swap.c:843 1 lock held by syz-executor/10319: #0: ffffffff8fcc1408 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8fcc1408 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6672 1 lock held by syz-executor/10369: #0: ffffffff8fcc1408 (rtnl_mutex){+.+.}-{3:3}, at: rtnl_lock net/core/rtnetlink.c:79 [inline] #0: ffffffff8fcc1408 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x6e6/0xcf0 net/core/rtnetlink.c:6672 ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.12.0-rc7-syzkaller-00012-g3022e9d00ebe #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 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: 3422 Comm: kworker/u8:6 Not tainted 6.12.0-rc7-syzkaller-00012-g3022e9d00ebe #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Workqueue: bat_events batadv_nc_worker RIP: 0010:batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:412 [inline] RIP: 0010:batadv_nc_worker+0x215/0x610 net/batman-adv/network-coding.c:719 Code: 2d 0c f6 e8 7d 42 36 00 89 c3 31 ff 89 c6 e8 92 31 0c f6 85 db 74 15 e8 99 1a f2 f5 84 c0 74 18 e8 40 2d 0c f6 48 8b 5c 24 10 65 e8 34 2d 0c f6 48 8b 5c 24 10 eb 59 e8 48 42 36 00 89 c3 31 RSP: 0018:ffffc9000bdcfb58 EFLAGS: 00000293 RAX: ffffffff8b88ac70 RBX: ffffffff8b88ab2b RCX: ffff888032181e00 RDX: 0000000000000000 RSI: ffffffff8c603680 RDI: ffffffff8c603640 RBP: 0000000000000000 R08: ffffffff8b88ac5e R09: 1ffffffff2853100 R10: dffffc0000000000 R11: fffffbfff2853101 R12: ffff88806345ccc0 R13: 0000000000000165 R14: ffff88802795e5c0 R15: dffffc0000000000 FS: 0000000000000000(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2924709178 CR3: 000000002af5a000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: 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