INFO: task syz.0.19:5416 blocked for more than 143 seconds. Not tainted 6.11.0-syzkaller-07262-g839c4f596f89 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.19 state:D stack:27312 pid:5416 tgid:5382 ppid:5213 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0x17ae/0x4a10 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6621 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6678 rwsem_down_write_slowpath+0xeeb/0x13b0 kernel/locking/rwsem.c:1178 __down_write_common kernel/locking/rwsem.c:1306 [inline] __down_write kernel/locking/rwsem.c:1315 [inline] down_write+0x1d7/0x220 kernel/locking/rwsem.c:1580 inode_lock include/linux/fs.h:815 [inline] bch2_write_iter+0x13a/0x2480 fs/bcachefs/fs-io-buffered.c:1045 new_sync_write fs/read_write.c:590 [inline] vfs_write+0xa6d/0xc90 fs/read_write.c:683 ksys_write+0x1a0/0x2c0 fs/read_write.c:736 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: 0033:0x7f6d0037def9 RSP: 002b:00007f6d01169038 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f6d00536058 RCX: 00007f6d0037def9 RDX: 0000000000000060 RSI: 0000000020000300 RDI: 0000000000000004 RBP: 00007f6d003f0b76 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f6d00536058 R15: 00007ffd0d4a2df8 INFO: task syz.4.38:5466 blocked for more than 144 seconds. Not tainted 6.11.0-syzkaller-07262-g839c4f596f89 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.4.38 state:D stack:23032 pid:5466 tgid:5465 ppid:5215 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:5188 [inline] __schedule+0x17ae/0x4a10 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6621 io_schedule+0x8d/0x110 kernel/sched/core.c:7401 folio_wait_bit_common+0x882/0x12b0 mm/filemap.c:1307 folio_wait_writeback+0xe7/0x1e0 mm/page-writeback.c:3189 __filemap_fdatawait_range+0x181/0x410 mm/filemap.c:532 filemap_fdatawait_keep_errors+0x31/0xd0 mm/filemap.c:627 wait_sb_inodes fs/fs-writeback.c:2680 [inline] sync_inodes_sb+0x8b2/0xb40 fs/fs-writeback.c:2802 iterate_supers+0xc6/0x190 fs/super.c:934 ksys_sync+0xbd/0x1c0 fs/sync.c:102 __do_sys_sync+0xe/0x20 fs/sync.c:113 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: 0033:0x7f5eb5b7def9 RSP: 002b:00007f5eb68e1038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 RAX: ffffffffffffffda RBX: 00007f5eb5d35f80 RCX: 00007f5eb5b7def9 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 00007f5eb5bf0b76 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f5eb5d35f80 R15: 00007ffc76617ea8 Showing all locks held in the system: 2 locks held by kworker/u8:0/11: #0: ffff8880b883e958 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:560 #1: ffff8880b8928948 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x441/0x770 kernel/sched/psi.c:989 2 locks held by kworker/u8:1/13: 1 lock held by khungtaskd/30: #0: ffffffff8e938b60 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:337 [inline] #0: ffffffff8e938b60 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline] #0: ffffffff8e938b60 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6701 2 locks held by kworker/u8:2/35: #0: ffff88801e341948 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3204 [inline] #0: ffff88801e341948 ((wq_completion)iou_exit){+.+.}-{0:0}, at: process_scheduled_works+0x93b/0x1850 kernel/workqueue.c:3310 #1: ffffc90000ab7d00 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work kernel/workqueue.c:3205 [inline] #1: ffffc90000ab7d00 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_scheduled_works+0x976/0x1850 kernel/workqueue.c:3310 2 locks held by getty/4971: #0: ffff8880326220a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900031232f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211 3 locks held by kworker/0:7/5312: #0: ffff8880b883e958 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:560 #1: ffff8880b8828948 (&per_cpu_ptr(group->pcpu, cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x441/0x770 kernel/sched/psi.c:989 #2: ffffffff9a62f010 (&obj_hash[i].lock){-.-.}-{2:2}, at: __debug_check_no_obj_freed lib/debugobjects.c:978 [inline] #2: ffffffff9a62f010 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_check_no_obj_freed+0x234/0x580 lib/debugobjects.c:1019 5 locks held by syz.0.19/5383: #0: ffff88807d1d6420 (sb_writers#20){.+.+}-{0:0}, at: mnt_want_write+0x3f/0x90 fs/namespace.c:515 #1: ffff88805c86a628 (&sb->s_type->i_mutex_key#26){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline] #1: ffff88805c86a628 (&sb->s_type->i_mutex_key#26){+.+.}-{3:3}, at: do_truncate+0x20c/0x310 fs/open.c:63 #2: ffff888055680a18 (&c->snapshot_create_lock){.+.+}-{3:3}, at: bch2_truncate+0x16c/0x2c0 fs/bcachefs/io_misc.c:290 #3: ffff8880556842c0 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:151 [inline] #3: ffff8880556842c0 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:250 [inline] #3: ffff8880556842c0 (&c->btree_trans_barrier){.+.+}-{0:0}, at: __bch2_trans_get+0x7de/0xd20 fs/bcachefs/btree_iter.c:3200 #4: ffff8880556a6690 (&c->gc_lock){.+.+}-{3:3}, at: bch2_btree_update_start+0x682/0x14e0 fs/bcachefs/btree_update_interior.c:1197 3 locks held by syz.0.19/5416: #0: ffff88802f0a2478 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x24e/0x320 fs/file.c:1187 #1: ffff88807d1d6420 (sb_writers#20){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2930 [inline] #1: ffff88807d1d6420 (sb_writers#20){.+.+}-{0:0}, at: vfs_write+0x224/0xc90 fs/read_write.c:679 #2: ffff88805c86a628 (&sb->s_type->i_mutex_key#26){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:815 [inline] #2: ffff88805c86a628 (&sb->s_type->i_mutex_key#26){+.+.}-{3:3}, at: bch2_write_iter+0x13a/0x2480 fs/bcachefs/fs-io-buffered.c:1045 1 lock held by syz.0.19/5417: #0: ffff88807d1d6420 (sb_writers#20){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2930 [inline] #0: ffff88807d1d6420 (sb_writers#20){.+.+}-{0:0}, at: vfs_writev+0x2d1/0xba0 fs/read_write.c:1062 1 lock held by syz.0.19/5422: #0: ffff88807d1d6420 (sb_writers#20){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2930 [inline] #0: ffff88807d1d6420 (sb_writers#20){.+.+}-{0:0}, at: vfs_writev+0x2d1/0xba0 fs/read_write.c:1062 2 locks held by bch-reclaim/loo/5397: 2 locks held by syz.4.38/5466: #0: ffff88807d1d60e0 (&type->s_umount_key#70){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807d1d60e0 (&type->s_umount_key#70){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff88807d1d6938 (&s->s_sync_lock){+.+.}-{3:3}, at: wait_sb_inodes fs/fs-writeback.c:2619 [inline] #1: ffff88807d1d6938 (&s->s_sync_lock){+.+.}-{3:3}, at: sync_inodes_sb+0x335/0xb40 fs/fs-writeback.c:2802 2 locks held by syz.4.79/5796: #0: ffff88807d1d60e0 (&type->s_umount_key#70){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807d1d60e0 (&type->s_umount_key#70){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff88807d1d6938 (&s->s_sync_lock){+.+.}-{3:3}, at: wait_sb_inodes fs/fs-writeback.c:2619 [inline] #1: ffff88807d1d6938 (&s->s_sync_lock){+.+.}-{3:3}, at: sync_inodes_sb+0x335/0xb40 fs/fs-writeback.c:2802 2 locks held by syz.1.127/6141: #0: ffff88807d1d60e0 (&type->s_umount_key#70){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807d1d60e0 (&type->s_umount_key#70){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff88807d1d6938 (&s->s_sync_lock){+.+.}-{3:3}, at: wait_sb_inodes fs/fs-writeback.c:2619 [inline] #1: ffff88807d1d6938 (&s->s_sync_lock){+.+.}-{3:3}, at: sync_inodes_sb+0x335/0xb40 fs/fs-writeback.c:2802 2 locks held by syz.0.147/6297: #0: ffff88807d1d60e0 (&type->s_umount_key#70){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807d1d60e0 (&type->s_umount_key#70){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff88807d1d6938 (&s->s_sync_lock){+.+.}-{3:3}, at: wait_sb_inodes fs/fs-writeback.c:2619 [inline] #1: ffff88807d1d6938 (&s->s_sync_lock){+.+.}-{3:3}, at: sync_inodes_sb+0x335/0xb40 fs/fs-writeback.c:2802 2 locks held by syz.2.149/6305: #0: ffff88807d1d60e0 (&type->s_umount_key#70){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807d1d60e0 (&type->s_umount_key#70){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff88807d1d6938 (&s->s_sync_lock){+.+.}-{3:3}, at: wait_sb_inodes fs/fs-writeback.c:2619 [inline] #1: ffff88807d1d6938 (&s->s_sync_lock){+.+.}-{3:3}, at: sync_inodes_sb+0x335/0xb40 fs/fs-writeback.c:2802 2 locks held by syz.1.175/6436: #0: ffff88807d1d60e0 (&type->s_umount_key#70){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807d1d60e0 (&type->s_umount_key#70){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff88807d1d6938 (&s->s_sync_lock){+.+.}-{3:3}, at: wait_sb_inodes fs/fs-writeback.c:2619 [inline] #1: ffff88807d1d6938 (&s->s_sync_lock){+.+.}-{3:3}, at: sync_inodes_sb+0x335/0xb40 fs/fs-writeback.c:2802 2 locks held by syz.4.178/6457: #0: ffff88807d1d60e0 (&type->s_umount_key#70){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807d1d60e0 (&type->s_umount_key#70){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff88807d1d6938 (&s->s_sync_lock){+.+.}-{3:3}, at: wait_sb_inodes fs/fs-writeback.c:2619 [inline] #1: ffff88807d1d6938 (&s->s_sync_lock){+.+.}-{3:3}, at: sync_inodes_sb+0x335/0xb40 fs/fs-writeback.c:2802 2 locks held by syz.0.203/6554: #0: ffff88807d1d60e0 (&type->s_umount_key#70){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807d1d60e0 (&type->s_umount_key#70){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff88807d1d6938 (&s->s_sync_lock){+.+.}-{3:3}, at: wait_sb_inodes fs/fs-writeback.c:2619 [inline] #1: ffff88807d1d6938 (&s->s_sync_lock){+.+.}-{3:3}, at: sync_inodes_sb+0x335/0xb40 fs/fs-writeback.c:2802 2 locks held by syz.3.230/6673: #0: ffff88807d1d60e0 (&type->s_umount_key#70){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807d1d60e0 (&type->s_umount_key#70){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff88807d1d6938 (&s->s_sync_lock){+.+.}-{3:3}, at: wait_sb_inodes fs/fs-writeback.c:2619 [inline] #1: ffff88807d1d6938 (&s->s_sync_lock){+.+.}-{3:3}, at: sync_inodes_sb+0x335/0xb40 fs/fs-writeback.c:2802 2 locks held by syz.0.246/6720: #0: ffff88807d1d60e0 (&type->s_umount_key#70){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] #0: ffff88807d1d60e0 (&type->s_umount_key#70){++++}-{3:3}, at: super_lock+0x27c/0x400 fs/super.c:120 #1: ffff88807d1d6938 (&s->s_sync_lock){+.+.}-{3:3}, at: wait_sb_inodes fs/fs-writeback.c:2619 [inline] #1: ffff88807d1d6938 (&s->s_sync_lock){+.+.}-{3:3}, at: sync_inodes_sb+0x335/0xb40 fs/fs-writeback.c:2802 ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-syzkaller-07262-g839c4f596f89 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 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: 1067 Comm: kworker/u8:6 Not tainted 6.11.0-syzkaller-07262-g839c4f596f89 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Workqueue: bat_events batadv_nc_worker RIP: 0010:mark_usage kernel/locking/lockdep.c:4621 [inline] RIP: 0010:__lock_acquire+0xc1a/0x2050 kernel/locking/lockdep.c:5153 Code: 04 00 00 00 e8 a7 60 00 00 48 ba 00 00 00 00 00 fc ff df 85 c0 0f 84 4a 05 00 00 0f b6 04 13 84 c0 0f 85 1f 0d 00 00 41 8b 07 00 00 18 00 0f 84 d3 04 00 00 4c 89 e7 48 89 ee ba 08 00 00 00 RSP: 0018:ffffc90003b87850 EFLAGS: 00000046 RAX: 00000000000406c4 RBX: 1ffff11004d85caa RCX: 00000000000406c4 RDX: dffffc0000000000 RSI: 0000000000000008 RDI: ffffffff94219958 RBP: ffff888026c2e530 R08: ffffffff9421995f R09: 1ffffffff284332b R10: dffffc0000000000 R11: fffffbfff284332c R12: ffff888026c2da00 R13: ffff888026c2e4d8 R14: 0000000000000002 R15: ffff888026c2e550 FS: 0000000000000000(0000) GS:ffff8880b8800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe250307ab8 CR3: 000000000e734000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5822 __raw_spin_lock_bh include/linux/spinlock_api_smp.h:126 [inline] _raw_spin_lock_bh+0x35/0x50 kernel/locking/spinlock.c:178 spin_lock_bh include/linux/spinlock.h:356 [inline] batadv_nc_purge_paths+0xe8/0x3b0 net/batman-adv/network-coding.c:442 batadv_nc_worker+0x365/0x610 net/batman-adv/network-coding.c:722 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