====================================================== WARNING: possible circular locking dependency detected 6.4.0-rc6-next-20230614-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor.4/6464 is trying to acquire lock: ffff8880212bed68 (&mm->mmap_lock){++++}-{3:3}, at: mmap_read_lock include/linux/mmap_lock.h:142 [inline] ffff8880212bed68 (&mm->mmap_lock){++++}-{3:3}, at: do_user_addr_fault+0xb3d/0x1210 arch/x86/mm/fault.c:1391 but task is already holding lock: ffff888073e324b0 (&sb->s_type->i_mutex_key#21){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:768 [inline] ffff888073e324b0 (&sb->s_type->i_mutex_key#21){+.+.}-{3:3}, at: f2fs_file_write_iter+0x297/0x2500 fs/f2fs/file.c:4732 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&sb->s_type->i_mutex_key#21){+.+.}-{3:3}: down_write+0x92/0x200 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:768 [inline] f2fs_file_mmap+0x154/0x290 fs/f2fs/file.c:527 call_mmap include/linux/fs.h:1870 [inline] mmap_region+0x99c/0x2770 mm/mmap.c:2675 do_mmap+0x850/0xee0 mm/mmap.c:1367 vm_mmap_pgoff+0x1a2/0x3b0 mm/util.c:543 ksys_mmap_pgoff+0x42b/0x5b0 mm/mmap.c:1413 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd -> #0 (&mm->mmap_lock){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3142 [inline] check_prevs_add kernel/locking/lockdep.c:3261 [inline] validate_chain kernel/locking/lockdep.c:3876 [inline] __lock_acquire+0x2e9d/0x5e20 kernel/locking/lockdep.c:5144 lock_acquire.part.0+0x11c/0x370 kernel/locking/lockdep.c:5761 down_read+0x9c/0x480 kernel/locking/rwsem.c:1520 mmap_read_lock include/linux/mmap_lock.h:142 [inline] do_user_addr_fault+0xb3d/0x1210 arch/x86/mm/fault.c:1391 handle_page_fault arch/x86/mm/fault.c:1534 [inline] exc_page_fault+0x98/0x170 arch/x86/mm/fault.c:1590 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 fault_in_readable+0x1a5/0x210 mm/gup.c:1921 fault_in_iov_iter_readable+0x252/0x2c0 lib/iov_iter.c:216 f2fs_preallocate_blocks fs/f2fs/file.c:4508 [inline] f2fs_file_write_iter+0x516/0x2500 fs/f2fs/file.c:4744 call_write_iter include/linux/fs.h:1865 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x960/0xd70 fs/read_write.c:584 ksys_write+0x122/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sb->s_type->i_mutex_key#21); lock(&mm->mmap_lock); lock(&sb->s_type->i_mutex_key#21); rlock(&mm->mmap_lock); *** DEADLOCK *** 3 locks held by syz-executor.4/6464: #0: ffff88807bf48848 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0xd7/0xf0 fs/file.c:1047 #1: ffff88807802e410 (sb_writers#13){.+.+}-{0:0}, at: ksys_write+0x122/0x250 fs/read_write.c:637 #2: ffff888073e324b0 (&sb->s_type->i_mutex_key#21){+.+.}-{3:3}, at: inode_lock include/linux/fs.h:768 [inline] #2: ffff888073e324b0 (&sb->s_type->i_mutex_key#21){+.+.}-{3:3}, at: f2fs_file_write_iter+0x297/0x2500 fs/f2fs/file.c:4732 stack backtrace: CPU: 0 PID: 6464 Comm: syz-executor.4 Not tainted 6.4.0-rc6-next-20230614-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x150 lib/dump_stack.c:106 check_noncircular+0x2df/0x3b0 kernel/locking/lockdep.c:2195 check_prev_add kernel/locking/lockdep.c:3142 [inline] check_prevs_add kernel/locking/lockdep.c:3261 [inline] validate_chain kernel/locking/lockdep.c:3876 [inline] __lock_acquire+0x2e9d/0x5e20 kernel/locking/lockdep.c:5144 lock_acquire.part.0+0x11c/0x370 kernel/locking/lockdep.c:5761 down_read+0x9c/0x480 kernel/locking/rwsem.c:1520 mmap_read_lock include/linux/mmap_lock.h:142 [inline] do_user_addr_fault+0xb3d/0x1210 arch/x86/mm/fault.c:1391 handle_page_fault arch/x86/mm/fault.c:1534 [inline] exc_page_fault+0x98/0x170 arch/x86/mm/fault.c:1590 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 RIP: 0010:fault_in_readable+0x1a5/0x210 mm/gup.c:1921 Code: fc ff df 48 c7 04 02 00 00 00 00 48 83 c4 48 4c 89 e0 5b 5d 41 5c 41 5d 41 5e 41 5f c3 45 31 e4 eb ce e8 de 95 c3 ff 45 31 f6 <41> 8a 45 00 31 ff 44 89 f6 88 44 24 28 e8 e9 91 c3 ff 45 85 f6 75 RSP: 0018:ffffc900039c7b38 EFLAGS: 00050246 RAX: 0000000000002a6b RBX: 0000000000000000 RCX: ffffc900065aa000 RDX: 0000000000040000 RSI: ffffffff81c0ccc2 RDI: 0000000000000007 RBP: 0000000020000209 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000200 R11: ffffffff8a40008b R12: 0000000000000009 R13: 0000000020000200 R14: 0000000000000000 R15: 1ffff92000738f68 fault_in_iov_iter_readable+0x252/0x2c0 lib/iov_iter.c:216 f2fs_preallocate_blocks fs/f2fs/file.c:4508 [inline] f2fs_file_write_iter+0x516/0x2500 fs/f2fs/file.c:4744 call_write_iter include/linux/fs.h:1865 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x960/0xd70 fs/read_write.c:584 ksys_write+0x122/0x250 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd RIP: 0033:0x7f2a80e8c199 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f2a81bb3168 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007f2a80fabf80 RCX: 00007f2a80e8c199 RDX: 0000000000000009 RSI: 0000000020000200 RDI: 0000000000000004 RBP: 00007f2a80ee7ca1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe0ce1dc6f R14: 00007f2a81bb3300 R15: 0000000000022000 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: df 48 c7 fisttps -0x39(%rax) 3: 04 02 add $0x2,%al 5: 00 00 add %al,(%rax) 7: 00 00 add %al,(%rax) 9: 48 83 c4 48 add $0x48,%rsp d: 4c 89 e0 mov %r12,%rax 10: 5b pop %rbx 11: 5d pop %rbp 12: 41 5c pop %r12 14: 41 5d pop %r13 16: 41 5e pop %r14 18: 41 5f pop %r15 1a: c3 retq 1b: 45 31 e4 xor %r12d,%r12d 1e: eb ce jmp 0xffffffee 20: e8 de 95 c3 ff callq 0xffc39603 25: 45 31 f6 xor %r14d,%r14d * 28: 41 8a 45 00 mov 0x0(%r13),%al <-- trapping instruction 2c: 31 ff xor %edi,%edi 2e: 44 89 f6 mov %r14d,%esi 31: 88 44 24 28 mov %al,0x28(%rsp) 35: e8 e9 91 c3 ff callq 0xffc39223 3a: 45 85 f6 test %r14d,%r14d 3d: 75 .byte 0x75