====================================================== WARNING: possible circular locking dependency detected 6.2.0-rc8-syzkaller-00021-ge1c04510f521 #0 Not tainted ------------------------------------------------------ syz-executor.3/26091 is trying to acquire lock: ffff88802f16c3b0 (&sbi->cp_rwsem){++++}-{3:3}, at: f2fs_down_read fs/f2fs/f2fs.h:2188 [inline] ffff88802f16c3b0 (&sbi->cp_rwsem){++++}-{3:3}, at: f2fs_lock_op fs/f2fs/f2fs.h:2231 [inline] ffff88802f16c3b0 (&sbi->cp_rwsem){++++}-{3:3}, at: f2fs_convert_inline_inode+0x57e/0x810 fs/f2fs/inline.c:219 but task is already holding lock: ffff888075dbad18 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline] ffff888075dbad18 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault arch/x86/mm/fault.c:1369 [inline] ffff888075dbad18 (&mm->mmap_lock){++++}-{3:3}, at: handle_page_fault arch/x86/mm/fault.c:1519 [inline] ffff888075dbad18 (&mm->mmap_lock){++++}-{3:3}, at: exc_page_fault+0x18d/0x880 arch/x86/mm/fault.c:1575 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (&mm->mmap_lock){++++}-{3:3}: lock_acquire+0x235/0x630 kernel/locking/lockdep.c:5668 __might_fault+0xba/0x120 mm/memory.c:5650 _copy_to_user+0x2a/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+0xaf1d/0xb500 fs/f2fs/file.c:4169 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl+0xf1/0x160 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #2 (&sbi->sb_lock){++++}-{3:3}: lock_acquire+0x235/0x630 kernel/locking/lockdep.c:5668 down_write+0x3a/0x60 kernel/locking/rwsem.c:1562 f2fs_down_write fs/f2fs/f2fs.h:2213 [inline] f2fs_handle_error+0xef/0x240 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+0xcb2/0x11a0 fs/f2fs/node.c:2531 f2fs_fill_super+0x53fd/0x7c80 fs/f2fs/super.c:4334 mount_bdev+0x271/0x3a0 fs/super.c:1359 legacy_get_tree+0xef/0x190 fs/fs_context.c:610 vfs_get_tree+0x8c/0x270 fs/super.c:1489 do_new_mount+0x28f/0xae0 fs/namespace.c:3145 do_mount fs/namespace.c:3488 [inline] __do_sys_mount fs/namespace.c:3697 [inline] __se_sys_mount+0x2d9/0x3c0 fs/namespace.c:3674 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #1 (&nm_i->nat_tree_lock){++++}-{3:3}: lock_acquire+0x235/0x630 kernel/locking/lockdep.c:5668 down_read+0x3d/0x50 kernel/locking/rwsem.c:1509 f2fs_down_read fs/f2fs/f2fs.h:2188 [inline] f2fs_get_node_info+0xf3/0x12d0 fs/f2fs/node.c:564 truncate_node+0x11f/0x850 fs/f2fs/node.c:896 truncate_dnode fs/f2fs/node.c:945 [inline] f2fs_truncate_inode_blocks+0xab7/0xee0 fs/f2fs/node.c:1154 f2fs_do_truncate_blocks+0xae5/0xf80 fs/f2fs/file.c:723 f2fs_truncate_blocks+0x10d/0x2f0 fs/f2fs/file.c:751 f2fs_truncate+0x4b6/0x8b0 fs/f2fs/file.c:803 f2fs_setattr+0xb59/0x1110 fs/f2fs/file.c:1010 notify_change+0xdd1/0x1080 fs/attr.c:482 do_truncate+0x220/0x300 fs/open.c:65 handle_truncate fs/namei.c:3216 [inline] do_open fs/namei.c:3561 [inline] path_openat+0x27a1/0x2e40 fs/namei.c:3714 do_filp_open+0x234/0x490 fs/namei.c:3741 do_sys_openat2+0x13f/0x500 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+0x225/0x270 fs/open.c:1330 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x41/0xc0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #0 (&sbi->cp_rwsem){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3097 [inline] check_prevs_add kernel/locking/lockdep.c:3216 [inline] validate_chain+0x166b/0x58e0 kernel/locking/lockdep.c:3831 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5055 lock_acquire+0x235/0x630 kernel/locking/lockdep.c:5668 down_read+0x3d/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_convert_inline_inode+0x57e/0x810 fs/f2fs/inline.c:219 f2fs_vm_page_mkwrite+0x32d/0x1440 fs/f2fs/file.c:79 do_page_mkwrite+0x1a1/0x600 mm/memory.c:2943 wp_page_shared mm/memory.c:3291 [inline] do_wp_page+0x506/0x3280 mm/memory.c:3373 handle_pte_fault mm/memory.c:4952 [inline] __handle_mm_fault mm/memory.c:5076 [inline] handle_mm_fault+0x2395/0x51e0 mm/memory.c:5222 do_user_addr_fault arch/x86/mm/fault.c:1428 [inline] handle_page_fault arch/x86/mm/fault.c:1519 [inline] exc_page_fault+0x673/0x880 arch/x86/mm/fault.c:1575 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 other info that might help us debug this: Chain exists of: &sbi->cp_rwsem --> &sbi->sb_lock --> &mm->mmap_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&mm->mmap_lock); lock(&sbi->sb_lock); lock(&mm->mmap_lock); lock(&sbi->cp_rwsem); *** DEADLOCK *** 1 lock held by syz-executor.3/26091: #0: ffff888075dbad18 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_trylock include/linux/mmap_lock.h:136 [inline] #0: ffff888075dbad18 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault arch/x86/mm/fault.c:1369 [inline] #0: ffff888075dbad18 (&mm->mmap_lock){++++}-{3:3}, at: handle_page_fault arch/x86/mm/fault.c:1519 [inline] #0: ffff888075dbad18 (&mm->mmap_lock){++++}-{3:3}, at: exc_page_fault+0x18d/0x880 arch/x86/mm/fault.c:1575 stack backtrace: CPU: 1 PID: 26091 Comm: syz-executor.3 Not tainted 6.2.0-rc8-syzkaller-00021-ge1c04510f521 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 check_noncircular+0x2fe/0x3b0 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+0x166b/0x58e0 kernel/locking/lockdep.c:3831 __lock_acquire+0x125b/0x1f80 kernel/locking/lockdep.c:5055 lock_acquire+0x235/0x630 kernel/locking/lockdep.c:5668 down_read+0x3d/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_convert_inline_inode+0x57e/0x810 fs/f2fs/inline.c:219 f2fs_vm_page_mkwrite+0x32d/0x1440 fs/f2fs/file.c:79 do_page_mkwrite+0x1a1/0x600 mm/memory.c:2943 wp_page_shared mm/memory.c:3291 [inline] do_wp_page+0x506/0x3280 mm/memory.c:3373 handle_pte_fault mm/memory.c:4952 [inline] __handle_mm_fault mm/memory.c:5076 [inline] handle_mm_fault+0x2395/0x51e0 mm/memory.c:5222 do_user_addr_fault arch/x86/mm/fault.c:1428 [inline] handle_page_fault arch/x86/mm/fault.c:1519 [inline] exc_page_fault+0x673/0x880 arch/x86/mm/fault.c:1575 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0033:0x7f9388686c64 Code: 0e 88 0f c3 48 8b 4c 16 f8 48 8b 36 48 89 4c 17 f8 48 89 37 c3 8b 4c 16 fc 8b 36 89 4c 17 fc 89 37 c3 0f b7 4c 16 fe 0f b7 36 <66> 89 4c 17 fe 66 89 37 c3 48 81 fa 00 08 00 00 77 8a 48 81 fa 80 RSP: 002b:00007ffea6c61748 EFLAGS: 00010202 RAX: 0000000020000040 RBX: 0000000000000000 RCX: 000000000000002e RDX: 0000000000000002 RSI: 000000000000002e RDI: 0000000020000040 RBP: 00007ffea6c61808 R08: 00007f9388600000 R09: 00007f9388200000 R10: 00007f9388208260 R11: 0000000000000246 R12: 00000000002c1bfb R13: 00007ffea6c61830 R14: 00007f93887ac050 R15: 0000000000000032