====================================================== WARNING: possible circular locking dependency detected 6.15.0-rc7-syzkaller-00144-gb1427432d3b6 #0 Not tainted ------------------------------------------------------ syz.2.286/8485 is trying to acquire lock: ffff88805fec0140 (bcachefs_btree){+.+.}-{0:0}, at: trans_set_locked fs/bcachefs/btree_locking.h:198 [inline] ffff88805fec0140 (bcachefs_btree){+.+.}-{0:0}, at: bch2_trans_begin+0xa60/0x1f10 fs/bcachefs/btree_iter.c:3288 but task is already holding lock: ffff888058044ed8 (mapping.invalidate_lock#5){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:922 [inline] ffff888058044ed8 (mapping.invalidate_lock#5){.+.+}-{4:4}, at: page_cache_ra_order+0x445/0xc70 mm/readahead.c:491 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (mapping.invalidate_lock#5){.+.+}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 down_read+0x46/0x2e0 kernel/locking/rwsem.c:1524 filemap_invalidate_lock_shared include/linux/fs.h:922 [inline] filemap_fault+0x546/0x1200 mm/filemap.c:3391 bch2_page_fault+0x3e8/0x7a0 fs/bcachefs/fs-io-pagecache.c:594 __do_fault+0x135/0x390 mm/memory.c:5098 do_shared_fault mm/memory.c:5582 [inline] do_fault mm/memory.c:5656 [inline] do_pte_missing mm/memory.c:4160 [inline] handle_pte_fault mm/memory.c:5997 [inline] __handle_mm_fault+0x17f9/0x5380 mm/memory.c:6140 handle_mm_fault+0x2d5/0x7f0 mm/memory.c:6309 do_user_addr_fault+0xa81/0x1390 arch/x86/mm/fault.c:1337 handle_page_fault arch/x86/mm/fault.c:1480 [inline] exc_page_fault+0x68/0x110 arch/x86/mm/fault.c:1538 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 -> #3 (vm_lock){++++}-{0:0}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 __vma_enter_locked+0x182/0x380 mm/memory.c:6473 __vma_start_write+0x1e/0x120 mm/memory.c:6497 vma_start_write include/linux/mm.h:829 [inline] mprotect_fixup+0x571/0x9b0 mm/mprotect.c:670 setup_arg_pages+0x53a/0xaa0 fs/exec.c:780 load_elf_binary+0xb71/0x27a0 fs/binfmt_elf.c:1020 search_binary_handler fs/exec.c:1778 [inline] exec_binprm fs/exec.c:1810 [inline] bprm_execve+0x999/0x1440 fs/exec.c:1862 kernel_execve+0x8f0/0x9f0 fs/exec.c:2028 try_to_run_init_process+0x13/0x60 init/main.c:1385 kernel_init+0xad/0x1d0 init/main.c:1513 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #2 (&mm->mmap_lock){++++}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 __might_fault+0xcc/0x130 mm/memory.c:7151 _inline_copy_to_user include/linux/uaccess.h:192 [inline] _copy_to_user+0x2c/0xb0 lib/usercopy.c:26 copy_to_user include/linux/uaccess.h:225 [inline] copy_to_user_errcode fs/bcachefs/util.h:699 [inline] bch2_ioctl_read_super fs/bcachefs/chardev.c:596 [inline] bch2_fs_ioctl+0x189e/0x2fe0 fs/bcachefs/chardev.c:704 bch2_fs_file_ioctl+0x52d/0x1d10 fs/bcachefs/fs-ioctl.c:405 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:906 [inline] __se_sys_ioctl+0xf9/0x170 fs/ioctl.c:892 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #1 (&c->sb_lock){+.+.}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 __mutex_lock_common kernel/locking/mutex.c:601 [inline] __mutex_lock+0x182/0xe80 kernel/locking/mutex.c:746 __bch2_trans_mark_dev_sb fs/bcachefs/buckets.c:1090 [inline] bch2_trans_mark_dev_sb+0xf7/0x7c0 fs/bcachefs/buckets.c:1137 bch2_trans_mark_dev_sbs_flags+0x6a1/0x700 fs/bcachefs/buckets.c:1147 bch2_fs_initialize+0xab3/0x13c0 fs/bcachefs/recovery.c:1153 bch2_fs_start+0x6fb/0xae0 fs/bcachefs/super.c:1097 bch2_fs_get_tree+0xad7/0x13b0 fs/bcachefs/fs.c:2483 vfs_get_tree+0x92/0x2b0 fs/super.c:1759 do_new_mount+0x24a/0xa40 fs/namespace.c:3881 do_mount fs/namespace.c:4221 [inline] __do_sys_mount fs/namespace.c:4432 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4409 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (bcachefs_btree){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3909 __lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 trans_set_locked fs/bcachefs/btree_locking.h:198 [inline] bch2_trans_begin+0xa75/0x1f10 fs/bcachefs/btree_iter.c:3288 bchfs_read+0x186/0x2700 fs/bcachefs/fs-io-buffered.c:169 bch2_readahead+0xd61/0x1100 fs/bcachefs/fs-io-buffered.c:316 read_pages+0x17a/0x590 mm/readahead.c:160 page_cache_ra_order+0xa24/0xc70 mm/readahead.c:515 do_async_mmap_readahead mm/filemap.c:3290 [inline] filemap_fault+0x59e/0x1200 mm/filemap.c:3389 bch2_page_fault+0x3e8/0x7a0 fs/bcachefs/fs-io-pagecache.c:594 __do_fault+0x135/0x390 mm/memory.c:5098 do_read_fault mm/memory.c:5518 [inline] do_fault mm/memory.c:5652 [inline] do_pte_missing mm/memory.c:4160 [inline] handle_pte_fault mm/memory.c:5997 [inline] __handle_mm_fault+0x363e/0x5380 mm/memory.c:6140 handle_mm_fault+0x2d5/0x7f0 mm/memory.c:6309 faultin_page mm/gup.c:1193 [inline] __get_user_pages+0x16f0/0x2a40 mm/gup.c:1491 populate_vma_page_range+0x26b/0x340 mm/gup.c:1929 __mm_populate+0x24c/0x380 mm/gup.c:2032 mm_populate include/linux/mm.h:3487 [inline] vm_mmap_pgoff+0x3f0/0x4c0 mm/util.c:584 ksys_mmap_pgoff+0x51f/0x760 mm/mmap.c:607 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Chain exists of: bcachefs_btree --> vm_lock --> mapping.invalidate_lock#5 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(mapping.invalidate_lock#5); lock(vm_lock); lock(mapping.invalidate_lock#5); lock(bcachefs_btree); *** DEADLOCK *** 1 lock held by syz.2.286/8485: #0: ffff888058044ed8 (mapping.invalidate_lock#5){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:922 [inline] #0: ffff888058044ed8 (mapping.invalidate_lock#5){.+.+}-{4:4}, at: page_cache_ra_order+0x445/0xc70 mm/readahead.c:491 stack backtrace: CPU: 1 UID: 0 PID: 8485 Comm: syz.2.286 Not tainted 6.15.0-rc7-syzkaller-00144-gb1427432d3b6 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2079 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2211 check_prev_add kernel/locking/lockdep.c:3166 [inline] check_prevs_add kernel/locking/lockdep.c:3285 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3909 __lock_acquire+0xaac/0xd20 kernel/locking/lockdep.c:5235 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5866 trans_set_locked fs/bcachefs/btree_locking.h:198 [inline] bch2_trans_begin+0xa75/0x1f10 fs/bcachefs/btree_iter.c:3288 bchfs_read+0x186/0x2700 fs/bcachefs/fs-io-buffered.c:169 bch2_readahead+0xd61/0x1100 fs/bcachefs/fs-io-buffered.c:316 read_pages+0x17a/0x590 mm/readahead.c:160 page_cache_ra_order+0xa24/0xc70 mm/readahead.c:515 do_async_mmap_readahead mm/filemap.c:3290 [inline] filemap_fault+0x59e/0x1200 mm/filemap.c:3389 bch2_page_fault+0x3e8/0x7a0 fs/bcachefs/fs-io-pagecache.c:594 __do_fault+0x135/0x390 mm/memory.c:5098 do_read_fault mm/memory.c:5518 [inline] do_fault mm/memory.c:5652 [inline] do_pte_missing mm/memory.c:4160 [inline] handle_pte_fault mm/memory.c:5997 [inline] __handle_mm_fault+0x363e/0x5380 mm/memory.c:6140 handle_mm_fault+0x2d5/0x7f0 mm/memory.c:6309 faultin_page mm/gup.c:1193 [inline] __get_user_pages+0x16f0/0x2a40 mm/gup.c:1491 populate_vma_page_range+0x26b/0x340 mm/gup.c:1929 __mm_populate+0x24c/0x380 mm/gup.c:2032 mm_populate include/linux/mm.h:3487 [inline] vm_mmap_pgoff+0x3f0/0x4c0 mm/util.c:584 ksys_mmap_pgoff+0x51f/0x760 mm/mmap.c:607 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f0fcc58e969 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f0fcd417038 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 RAX: ffffffffffffffda RBX: 00007f0fcc7b5fa0 RCX: 00007f0fcc58e969 RDX: 00000000027ffff7 RSI: 0000000000600000 RDI: 0000200000000000 RBP: 00007f0fcc610ab1 R08: 0000000000000004 R09: 0000000000000000 R10: 0000000004012011 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007f0fcc7b5fa0 R15: 00007ffcb4121a18 bcachefs (loop2): shutting down bcachefs (loop2): going read-only bcachefs (loop2): finished waiting for writes to stop bcachefs (loop2): flushing journal and stopping allocators, journal seq 5 bcachefs (loop2): flushing journal and stopping allocators complete, journal seq 5 bcachefs (loop2): clean shutdown complete, journal seq 6 bcachefs (loop2): marking filesystem clean bcachefs (loop2): shutdown complete