====================================================== WARNING: possible circular locking dependency detected 5.2.0-rc1+ #1 Not tainted ------------------------------------------------------ syz-executor.3/7565 is trying to acquire lock: 000000008b66ea85 (&mm->mmap_sem#2){++++}, at: get_user_pages_unlocked+0xe2/0x2d0 mm/gup.c:1172 but task is already holding lock: 0000000025b01b69 (&sb->s_type->i_mutex_key#10){+.+.}, at: inode_trylock include/linux/fs.h:798 [inline] 0000000025b01b69 (&sb->s_type->i_mutex_key#10){+.+.}, at: ext4_file_write_iter+0x1e9/0xe90 fs/ext4/file.c:232 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&sb->s_type->i_mutex_key#10){+.+.}: down_write+0x38/0xa0 kernel/locking/rwsem.c:66 inode_lock include/linux/fs.h:778 [inline] process_measurement+0x69e/0x14b0 security/integrity/ima/ima_main.c:207 ima_file_mmap+0xf0/0x110 security/integrity/ima/ima_main.c:342 security_file_mprotect+0x91/0xc0 security/security.c:1430 do_mprotect_pkey+0x3b7/0x7f0 mm/mprotect.c:550 __do_sys_mprotect mm/mprotect.c:582 [inline] __se_sys_mprotect mm/mprotect.c:579 [inline] __x64_sys_mprotect+0x73/0xb0 mm/mprotect.c:579 do_syscall_64+0xd0/0x530 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe -> #0 (&mm->mmap_sem#2){++++}: lock_acquire+0x173/0x3d0 kernel/locking/lockdep.c:4302 down_read+0x3f/0x1e0 kernel/locking/rwsem.c:24 get_user_pages_unlocked+0xe2/0x2d0 mm/gup.c:1172 __gup_longterm_unlocked mm/gup.c:2191 [inline] get_user_pages_fast+0x318/0x440 mm/gup.c:2243 iov_iter_get_pages+0x200/0x1260 lib/iov_iter.c:1286 dio_refill_pages fs/direct-io.c:170 [inline] dio_get_page fs/direct-io.c:214 [inline] do_direct_IO fs/direct-io.c:982 [inline] do_blockdev_direct_IO+0x38dd/0x6f00 fs/direct-io.c:1335 __blockdev_direct_IO+0x72/0xd9 fs/direct-io.c:1421 ext4_direct_IO_write fs/ext4/inode.c:3772 [inline] ext4_direct_IO+0x86c/0x1670 fs/ext4/inode.c:3899 generic_file_direct_write+0x1e7/0x400 mm/filemap.c:3108 __generic_file_write_iter+0x270/0x580 mm/filemap.c:3291 ext4_file_write_iter+0x288/0xe90 fs/ext4/file.c:266 call_write_iter include/linux/fs.h:1872 [inline] new_sync_write+0x3fd/0x7e0 fs/read_write.c:483 __vfs_write+0x94/0x110 fs/read_write.c:496 vfs_write+0x150/0x4e0 fs/read_write.c:558 ksys_write+0x105/0x220 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x6e/0xb0 fs/read_write.c:620 do_syscall_64+0xd0/0x530 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&sb->s_type->i_mutex_key#10); lock(&mm->mmap_sem#2); lock(&sb->s_type->i_mutex_key#10); lock(&mm->mmap_sem#2); *** DEADLOCK *** 3 locks held by syz-executor.3/7565: #0: 0000000042532698 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0xa7/0xd0 fs/file.c:801 #1: 0000000082e07cc5 (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2837 [inline] #1: 0000000082e07cc5 (sb_writers#3){.+.+}, at: vfs_write+0x321/0x4e0 fs/read_write.c:557 #2: 0000000025b01b69 (&sb->s_type->i_mutex_key#10){+.+.}, at: inode_trylock include/linux/fs.h:798 [inline] #2: 0000000025b01b69 (&sb->s_type->i_mutex_key#10){+.+.}, at: ext4_file_write_iter+0x1e9/0xe90 fs/ext4/file.c:232 stack backtrace: CPU: 0 PID: 7565 Comm: syz-executor.3 Not tainted 5.2.0-rc1+ #1 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x113/0x167 lib/dump_stack.c:113 print_circular_bug.cold.59+0x1bd/0x27d kernel/locking/lockdep.c:1564 check_prev_add kernel/locking/lockdep.c:2309 [inline] check_prevs_add kernel/locking/lockdep.c:2417 [inline] validate_chain kernel/locking/lockdep.c:2799 [inline] __lock_acquire+0x3853/0x55b0 kernel/locking/lockdep.c:3792 lock_acquire+0x173/0x3d0 kernel/locking/lockdep.c:4302 down_read+0x3f/0x1e0 kernel/locking/rwsem.c:24 get_user_pages_unlocked+0xe2/0x2d0 mm/gup.c:1172 __gup_longterm_unlocked mm/gup.c:2191 [inline] get_user_pages_fast+0x318/0x440 mm/gup.c:2243 iov_iter_get_pages+0x200/0x1260 lib/iov_iter.c:1286 dio_refill_pages fs/direct-io.c:170 [inline] dio_get_page fs/direct-io.c:214 [inline] do_direct_IO fs/direct-io.c:982 [inline] do_blockdev_direct_IO+0x38dd/0x6f00 fs/direct-io.c:1335 __blockdev_direct_IO+0x72/0xd9 fs/direct-io.c:1421 ext4_direct_IO_write fs/ext4/inode.c:3772 [inline] ext4_direct_IO+0x86c/0x1670 fs/ext4/inode.c:3899 generic_file_direct_write+0x1e7/0x400 mm/filemap.c:3108 __generic_file_write_iter+0x270/0x580 mm/filemap.c:3291 ext4_file_write_iter+0x288/0xe90 fs/ext4/file.c:266 call_write_iter include/linux/fs.h:1872 [inline] new_sync_write+0x3fd/0x7e0 fs/read_write.c:483 __vfs_write+0x94/0x110 fs/read_write.c:496 vfs_write+0x150/0x4e0 fs/read_write.c:558 ksys_write+0x105/0x220 fs/read_write.c:611 __do_sys_write fs/read_write.c:623 [inline] __se_sys_write fs/read_write.c:620 [inline] __x64_sys_write+0x6e/0xb0 fs/read_write.c:620 do_syscall_64+0xd0/0x530 arch/x86/entry/common.c:301 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x459279 Code: fd b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f1afb4dbc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459279 RDX: 0000000020000012 RSI: 0000000020000000 RDI: 0000000000000005 RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f1afb4dc6d4 R13: 00000000004c8ec2 R14: 00000000004dfb80 R15: 00000000ffffffff