bcachefs (loop0): snapshots_read... done bcachefs (loop0): check_allocations... ====================================================== WARNING: possible circular locking dependency detected 6.10.0-rc4-syzkaller-00283-g563a50672d8a #0 Not tainted ------------------------------------------------------ syz-executor.0/6171 is trying to acquire lock: ffff888050200988 (&c->sb_lock){+.+.}-{3:3}, at: bch2_gc_mark_key+0xb8d/0xd60 fs/bcachefs/btree_gc.c:600 but task is already holding lock: ffff888050201a58 (&c->btree_root_lock){+.+.}-{3:3}, at: bch2_gc_btree.constprop.0+0x109/0x1030 fs/bcachefs/btree_gc.c:644 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&c->btree_root_lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x175/0x9c0 kernel/locking/mutex.c:752 bch2_btree_roots_to_journal_entries+0x93/0x570 fs/bcachefs/btree_update_interior.c:2633 bch2_fs_mark_clean+0x31b/0x470 fs/bcachefs/sb-clean.c:376 bch2_fs_read_only+0x88a/0xf10 fs/bcachefs/super.c:381 __bch2_fs_stop+0xfc/0x540 fs/bcachefs/super.c:615 generic_shutdown_super+0x159/0x3d0 fs/super.c:642 bch2_kill_sb+0x3b/0x50 fs/bcachefs/fs.c:2044 deactivate_locked_super+0xbe/0x1a0 fs/super.c:473 deactivate_super+0xde/0x100 fs/super.c:506 cleanup_mnt+0x222/0x450 fs/namespace.c:1267 task_work_run+0x14e/0x250 kernel/task_work.c:180 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+0x278/0x2a0 kernel/entry/common.c:218 do_syscall_64+0xda/0x250 arch/x86/entry/common.c:89 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (&c->sb_lock){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x175/0x9c0 kernel/locking/mutex.c:752 bch2_gc_mark_key+0xb8d/0xd60 fs/bcachefs/btree_gc.c:600 bch2_gc_btree.constprop.0+0xb4c/0x1030 fs/bcachefs/btree_gc.c:648 bch2_gc_btrees+0x426/0x8b0 fs/bcachefs/btree_gc.c:697 bch2_check_allocations+0x85c/0x24f0 fs/bcachefs/btree_gc.c:1224 bch2_run_recovery_pass+0x8e/0x1a0 fs/bcachefs/recovery_passes.c:182 bch2_run_recovery_passes+0x33b/0x710 fs/bcachefs/recovery_passes.c:225 bch2_fs_recovery+0x25ff/0x3e40 fs/bcachefs/recovery.c:813 bch2_fs_start+0x2e9/0x600 fs/bcachefs/super.c:1036 bch2_fs_open+0xfa0/0x1110 fs/bcachefs/super.c:2128 bch2_mount+0xe2c/0x1230 fs/bcachefs/fs.c:1926 legacy_get_tree+0x109/0x220 fs/fs_context.c:662 vfs_get_tree+0x8f/0x380 fs/super.c:1780 do_new_mount fs/namespace.c:3352 [inline] path_mount+0x14e6/0x1f20 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount fs/namespace.c:3875 [inline] __x64_sys_mount+0x297/0x320 fs/namespace.c:3875 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&c->btree_root_lock); lock(&c->sb_lock); lock(&c->btree_root_lock); lock(&c->sb_lock); *** DEADLOCK *** 4 locks held by syz-executor.0/6171: #0: ffff888050200278 (&c->state_lock){+.+.}-{3:3}, at: bch2_fs_start+0x3e/0x600 fs/bcachefs/super.c:1006 #1: ffff8880502268d0 (&c->gc_lock){++++}-{3:3}, at: bch2_check_allocations+0xe5/0x24f0 fs/bcachefs/btree_gc.c:1209 #2: ffff8880502042d8 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:116 [inline] #2: ffff8880502042d8 (&c->btree_trans_barrier){.+.+}-{0:0}, at: srcu_read_lock include/linux/srcu.h:215 [inline] #2: ffff8880502042d8 (&c->btree_trans_barrier){.+.+}-{0:0}, at: __bch2_trans_get+0x68b/0xf60 fs/bcachefs/btree_iter.c:3200 #3: ffff888050201a58 (&c->btree_root_lock){+.+.}-{3:3}, at: bch2_gc_btree.constprop.0+0x109/0x1030 fs/bcachefs/btree_gc.c:644 stack backtrace: CPU: 1 PID: 6171 Comm: syz-executor.0 Not tainted 6.10.0-rc4-syzkaller-00283-g563a50672d8a #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:114 check_noncircular+0x31a/0x400 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3869 [inline] __lock_acquire+0x2478/0x3b30 kernel/locking/lockdep.c:5137 lock_acquire kernel/locking/lockdep.c:5754 [inline] lock_acquire+0x1b1/0x560 kernel/locking/lockdep.c:5719 __mutex_lock_common kernel/locking/mutex.c:608 [inline] __mutex_lock+0x175/0x9c0 kernel/locking/mutex.c:752 bch2_gc_mark_key+0xb8d/0xd60 fs/bcachefs/btree_gc.c:600 bch2_gc_btree.constprop.0+0xb4c/0x1030 fs/bcachefs/btree_gc.c:648 bch2_gc_btrees+0x426/0x8b0 fs/bcachefs/btree_gc.c:697 bch2_check_allocations+0x85c/0x24f0 fs/bcachefs/btree_gc.c:1224 bch2_run_recovery_pass+0x8e/0x1a0 fs/bcachefs/recovery_passes.c:182 bch2_run_recovery_passes+0x33b/0x710 fs/bcachefs/recovery_passes.c:225 bch2_fs_recovery+0x25ff/0x3e40 fs/bcachefs/recovery.c:813 bch2_fs_start+0x2e9/0x600 fs/bcachefs/super.c:1036 bch2_fs_open+0xfa0/0x1110 fs/bcachefs/super.c:2128 bch2_mount+0xe2c/0x1230 fs/bcachefs/fs.c:1926 legacy_get_tree+0x109/0x220 fs/fs_context.c:662 vfs_get_tree+0x8f/0x380 fs/super.c:1780 do_new_mount fs/namespace.c:3352 [inline] path_mount+0x14e6/0x1f20 fs/namespace.c:3679 do_mount fs/namespace.c:3692 [inline] __do_sys_mount fs/namespace.c:3898 [inline] __se_sys_mount fs/namespace.c:3875 [inline] __x64_sys_mount+0x297/0x320 fs/namespace.c:3875 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f300c47e5ea Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 09 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f300d22fef8 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f300d22ff80 RCX: 00007f300c47e5ea RDX: 0000000020005b00 RSI: 0000000020000040 RDI: 00007f300d22ff40 RBP: 0000000020005b00 R08: 00007f300d22ff80 R09: 0000000000000002 R10: 0000000000000002 R11: 0000000000000202 R12: 0000000020000040 R13: 00007f300d22ff40 R14: 0000000000005b1c R15: 0000000020000240 done bcachefs (loop0): going read-write bcachefs (loop0): journal_replay... done bcachefs (loop0): check_alloc_info... done bcachefs (loop0): check_lrus... done bcachefs (loop0): check_btree_backpointers... done bcachefs (loop0): check_backpointers_to_extents... done bcachefs (loop0): check_extents_to_backpointers... missing backpointer for btree=inodes l=1 u64s 11 type btree_ptr_v2 SPOS_MAX len 0 ver 0: seq efdd7a26d7396dd5 written 24 min_key POS_MIN durability: 1 ptr: 0:38:0 gen 0 got: u64s 5 type deleted 0:9961472:0 len 0 ver 0 want: u64s 9 type backpointer 0:9961472:0 len 0 ver 0: bucket=0:38:0 btree=inodes l=1 offset=0:0 len=256 pos=SPOS_MAX, shutting down bcachefs (loop0): inconsistency detected - emergency read only at journal seq 8 bcachefs (loop0): bch2_check_extents_to_backpointers(): error fsck_errors_not_fixed bcachefs (loop0): bch2_fs_recovery(): error fsck_errors_not_fixed bcachefs (loop0): bch2_fs_start(): error starting filesystem fsck_errors_not_fixed bcachefs (loop0): shutting down bcachefs (loop0): shutdown complete