====================================================== WARNING: possible circular locking dependency detected 6.2.0-rc2-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.4/29618 is trying to acquire lock: ffff88802caec088 (&sbi->sb_lock){++++}-{3:3}, at: f2fs_down_write fs/f2fs/f2fs.h:2213 [inline] ffff88802caec088 (&sbi->sb_lock){++++}-{3:3}, at: f2fs_handle_error+0xe0/0x230 fs/f2fs/super.c:3926 but task is already holding lock: ffff88807b651130 (&nm_i->nat_tree_lock){++++}-{3:3}, at: f2fs_down_read fs/f2fs/f2fs.h:2188 [inline] ffff88807b651130 (&nm_i->nat_tree_lock){++++}-{3:3}, at: __f2fs_build_free_nids fs/f2fs/node.c:2483 [inline] ffff88807b651130 (&nm_i->nat_tree_lock){++++}-{3:3}, at: f2fs_build_free_nids+0x748/0x1190 fs/f2fs/node.c:2531 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (&nm_i->nat_tree_lock){++++}-{3:3}: lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668 down_read+0x39/0x50 kernel/locking/rwsem.c:1509 f2fs_down_read fs/f2fs/f2fs.h:2188 [inline] f2fs_get_node_info+0x100/0x1720 fs/f2fs/node.c:564 f2fs_new_node_page+0x402/0xea0 fs/f2fs/node.c:1295 f2fs_get_dnode_of_data+0x5b0/0x1da0 fs/f2fs/node.c:810 f2fs_reserve_block+0x50/0x240 fs/f2fs/data.c:1199 f2fs_get_new_data_page+0x180/0x7b0 fs/f2fs/data.c:1387 f2fs_add_regular_entry+0x687/0xea0 fs/f2fs/dir.c:754 f2fs_add_dentry fs/f2fs/dir.c:816 [inline] f2fs_do_add_link+0x2a7/0x470 fs/f2fs/dir.c:855 f2fs_add_link fs/f2fs/f2fs.h:3564 [inline] f2fs_create+0x324/0x530 fs/f2fs/namei.c:363 lookup_open fs/namei.c:3413 [inline] open_last_lookups fs/namei.c:3481 [inline] path_openat+0x12ac/0x2dd0 fs/namei.c:3711 do_filp_open+0x264/0x4f0 fs/namei.c:3741 do_sys_openat2+0x124/0x4e0 fs/open.c:1310 do_sys_open fs/open.c:1326 [inline] __do_sys_open fs/open.c:1334 [inline] __se_sys_open fs/open.c:1330 [inline] __x64_sys_open+0x221/0x270 fs/open.c:1330 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #3 (&sbi->cp_rwsem){++++}-{3:3}: lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668 down_read+0x39/0x50 kernel/locking/rwsem.c:1509 f2fs_down_read fs/f2fs/f2fs.h:2188 [inline] f2fs_lock_op fs/f2fs/f2fs.h:2231 [inline] f2fs_do_truncate_blocks+0x12a/0x740 fs/f2fs/file.c:688 f2fs_truncate_blocks+0x10b/0x300 fs/f2fs/file.c:751 f2fs_truncate+0x363/0x5b0 fs/f2fs/file.c:803 f2fs_setattr+0xb5b/0x1120 fs/f2fs/file.c:1010 notify_change+0xe50/0x1100 fs/attr.c:482 do_truncate+0x200/0x2f0 fs/open.c:65 do_sys_ftruncate+0x2b0/0x350 fs/open.c:193 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #2 (mapping.invalidate_lock#4){++++}-{3:3}: lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668 down_read+0x39/0x50 kernel/locking/rwsem.c:1509 filemap_invalidate_lock_shared include/linux/fs.h:811 [inline] filemap_fault+0x2fb/0x1060 mm/filemap.c:3146 f2fs_filemap_fault+0x75/0xb0 fs/f2fs/file.c:44 __do_fault+0x136/0x4f0 mm/memory.c:4163 do_shared_fault mm/memory.c:4569 [inline] do_fault mm/memory.c:4647 [inline] handle_pte_fault mm/memory.c:4931 [inline] __handle_mm_fault mm/memory.c:5073 [inline] handle_mm_fault+0x18bc/0x26b0 mm/memory.c:5219 do_user_addr_fault+0x69b/0xcb0 arch/x86/mm/fault.c:1428 handle_page_fault arch/x86/mm/fault.c:1519 [inline] exc_page_fault+0x7a/0x110 arch/x86/mm/fault.c:1575 asm_exc_page_fault+0x22/0x30 arch/x86/include/asm/idtentry.h:570 -> #1 (&mm->mmap_lock){++++}-{3:3}: lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668 __might_fault+0xb2/0x110 mm/memory.c:5647 _copy_to_user+0x26/0x130 lib/usercopy.c:29 copy_to_user include/linux/uaccess.h:169 [inline] f2fs_ioc_get_encryption_pwsalt fs/f2fs/file.c:2365 [inline] __f2fs_ioctl+0xaf72/0xb540 fs/f2fs/file.c:4169 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #0 (&sbi->sb_lock){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3097 [inline] check_prevs_add kernel/locking/lockdep.c:3216 [inline] validate_chain+0x1898/0x6ae0 kernel/locking/lockdep.c:3831 __lock_acquire+0x1292/0x1f60 kernel/locking/lockdep.c:5055 lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668 down_write+0x9c/0x270 kernel/locking/rwsem.c:1562 f2fs_down_write fs/f2fs/f2fs.h:2213 [inline] f2fs_handle_error+0xe0/0x230 fs/f2fs/super.c:3926 scan_nat_page fs/f2fs/node.c:2387 [inline] __f2fs_build_free_nids fs/f2fs/node.c:2493 [inline] f2fs_build_free_nids+0xb8c/0x1190 fs/f2fs/node.c:2531 f2fs_fill_super+0x4a5f/0x6ee0 fs/f2fs/super.c:4334 mount_bdev+0x26c/0x3a0 fs/super.c:1359 legacy_get_tree+0xea/0x180 fs/fs_context.c:610 vfs_get_tree+0x88/0x270 fs/super.c:1489 do_new_mount+0x289/0xad0 fs/namespace.c:3145 do_mount fs/namespace.c:3488 [inline] __do_sys_mount fs/namespace.c:3697 [inline] __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3674 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd other info that might help us debug this: Chain exists of: &sbi->sb_lock --> &sbi->cp_rwsem --> &nm_i->nat_tree_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&nm_i->nat_tree_lock); lock(&sbi->cp_rwsem); lock(&nm_i->nat_tree_lock); lock(&sbi->sb_lock); *** DEADLOCK *** 3 locks held by syz-executor.4/29618: #0: ffff8880405ce0e0 (&type->s_umount_key#59/1){+.+.}-{3:3}, at: alloc_super+0x212/0x920 fs/super.c:228 #1: ffff88807b6512c8 (&nm_i->build_lock){+.+.}-{3:3}, at: f2fs_build_free_nids+0xc0/0x1190 fs/f2fs/node.c:2530 #2: ffff88807b651130 (&nm_i->nat_tree_lock){++++}-{3:3}, at: f2fs_down_read fs/f2fs/f2fs.h:2188 [inline] #2: ffff88807b651130 (&nm_i->nat_tree_lock){++++}-{3:3}, at: __f2fs_build_free_nids fs/f2fs/node.c:2483 [inline] #2: ffff88807b651130 (&nm_i->nat_tree_lock){++++}-{3:3}, at: f2fs_build_free_nids+0x748/0x1190 fs/f2fs/node.c:2531 stack backtrace: CPU: 1 PID: 29618 Comm: syz-executor.4 Not tainted 6.2.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1b1/0x290 lib/dump_stack.c:106 check_noncircular+0x2cc/0x390 kernel/locking/lockdep.c:2177 check_prev_add kernel/locking/lockdep.c:3097 [inline] check_prevs_add kernel/locking/lockdep.c:3216 [inline] validate_chain+0x1898/0x6ae0 kernel/locking/lockdep.c:3831 __lock_acquire+0x1292/0x1f60 kernel/locking/lockdep.c:5055 lock_acquire+0x182/0x3c0 kernel/locking/lockdep.c:5668 down_write+0x9c/0x270 kernel/locking/rwsem.c:1562 f2fs_down_write fs/f2fs/f2fs.h:2213 [inline] f2fs_handle_error+0xe0/0x230 fs/f2fs/super.c:3926 scan_nat_page fs/f2fs/node.c:2387 [inline] __f2fs_build_free_nids fs/f2fs/node.c:2493 [inline] f2fs_build_free_nids+0xb8c/0x1190 fs/f2fs/node.c:2531 f2fs_fill_super+0x4a5f/0x6ee0 fs/f2fs/super.c:4334 mount_bdev+0x26c/0x3a0 fs/super.c:1359 legacy_get_tree+0xea/0x180 fs/fs_context.c:610 vfs_get_tree+0x88/0x270 fs/super.c:1489 do_new_mount+0x289/0xad0 fs/namespace.c:3145 do_mount fs/namespace.c:3488 [inline] __do_sys_mount fs/namespace.c:3697 [inline] __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3674 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7ff1c6e8d5da Code: 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ff1c7c04f88 EFLAGS: 00000202 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00000000000105ec RCX: 00007ff1c6e8d5da RDX: 0000000020010600 RSI: 0000000020010640 RDI: 00007ff1c7c04fe0 RBP: 00007ff1c7c05020 R08: 00007ff1c7c05020 R09: 0000000001000000 R10: 0000000001000000 R11: 0000000000000202 R12: 0000000020010600 R13: 0000000020010640 R14: 00007ff1c7c04fe0 R15: 0000000020000300