EXT4-fs (loop3): mounted filesystem 00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode: none. ====================================================== WARNING: possible circular locking dependency detected 6.6.0-rc7-syzkaller-00012-ge017769f4ce2 #0 Not tainted ------------------------------------------------------ syz-executor.3/5856 is trying to acquire lock: ffff88801040e0e0 (&type->s_umount_key#32){++++}-{3:3}, at: __super_lock fs/super.c:58 [inline] ffff88801040e0e0 (&type->s_umount_key#32){++++}-{3:3}, at: super_lock+0x23c/0x380 fs/super.c:117 but task is already holding lock: ffff888015023a88 (&bdev->bd_holder_lock){+.+.}-{3:3}, at: blkdev_flushbuf block/ioctl.c:370 [inline] ffff888015023a88 (&bdev->bd_holder_lock){+.+.}-{3:3}, at: blkdev_common_ioctl+0x14e9/0x1ce0 block/ioctl.c:502 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #5 (&bdev->bd_holder_lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x181/0x1340 kernel/locking/mutex.c:747 bd_finish_claiming block/bdev.c:566 [inline] blkdev_get_by_dev.part.0+0x374/0xb20 block/bdev.c:799 blkdev_get_by_dev+0x75/0x80 block/bdev.c:829 setup_bdev_super+0x78/0x6f0 fs/super.c:1484 mount_bdev+0x1c0/0x2e0 fs/super.c:1626 legacy_get_tree+0x109/0x220 fs/fs_context.c:662 vfs_get_tree+0x8c/0x370 fs/super.c:1750 do_new_mount fs/namespace.c:3335 [inline] path_mount+0x1492/0x1ed0 fs/namespace.c:3662 init_mount+0xbf/0x110 fs/init.c:25 do_mount_root+0xdd/0x2c0 init/do_mounts.c:166 mount_root_generic+0x19a/0x460 init/do_mounts.c:205 mount_block_root init/do_mounts.c:378 [inline] mount_root+0x241/0x480 init/do_mounts.c:405 prepare_namespace+0xe3/0x3f0 init/do_mounts.c:489 kernel_init_freeable+0x703/0x900 init/main.c:1560 kernel_init+0x1c/0x2a0 init/main.c:1437 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 -> #4 (bdev_lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x181/0x1340 kernel/locking/mutex.c:747 bd_prepare_to_claim+0x1a4/0x280 block/bdev.c:508 truncate_bdev_range+0x48/0x270 block/bdev.c:105 blk_ioctl_discard block/ioctl.c:116 [inline] blkdev_common_ioctl+0x1753/0x1ce0 block/ioctl.c:506 compat_blkdev_ioctl+0x262/0x7c0 block/ioctl.c:684 __do_compat_sys_ioctl+0x2bf/0x330 fs/ioctl.c:972 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 -> #3 (mapping.invalidate_lock#2){++++}-{3:3}: down_read+0x9c/0x470 kernel/locking/rwsem.c:1520 filemap_invalidate_lock_shared include/linux/fs.h:857 [inline] filemap_fault+0x28c/0x3550 mm/filemap.c:3283 __do_fault+0x107/0x600 mm/memory.c:4204 do_shared_fault mm/memory.c:4635 [inline] do_fault mm/memory.c:4709 [inline] do_pte_missing mm/memory.c:3669 [inline] handle_pte_fault mm/memory.c:4978 [inline] __handle_mm_fault+0x2594/0x3e10 mm/memory.c:5119 handle_mm_fault+0x478/0xa00 mm/memory.c:5284 do_user_addr_fault+0x3d1/0x1000 arch/x86/mm/fault.c:1413 handle_page_fault arch/x86/mm/fault.c:1505 [inline] exc_page_fault+0x5c/0xd0 arch/x86/mm/fault.c:1561 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 __put_user_4+0x11/0x20 arch/x86/lib/putuser.S:87 put_int block/ioctl.c:204 [inline] blkdev_common_ioctl+0x832/0x1ce0 block/ioctl.c:525 compat_blkdev_ioctl+0x262/0x7c0 block/ioctl.c:684 __do_compat_sys_ioctl+0x2bf/0x330 fs/ioctl.c:972 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 -> #2 (&mm->mmap_lock){++++}-{3:3}: down_read_killable+0x9f/0x4b0 kernel/locking/rwsem.c:1543 mmap_read_lock_killable include/linux/mmap_lock.h:155 [inline] get_mmap_lock_carefully mm/memory.c:5320 [inline] lock_mm_and_find_vma+0x3de/0x760 mm/memory.c:5371 do_user_addr_fault+0x388/0x1000 arch/x86/mm/fault.c:1385 handle_page_fault arch/x86/mm/fault.c:1505 [inline] exc_page_fault+0x5c/0xd0 arch/x86/mm/fault.c:1561 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 fault_in_readable+0x106/0x200 mm/gup.c:1984 fault_in_iov_iter_readable+0x250/0x2c0 lib/iov_iter.c:216 generic_perform_write+0x1d6/0x600 mm/filemap.c:3959 ext4_buffered_write_iter+0x11f/0x3c0 fs/ext4/file.c:299 ext4_file_write_iter+0x7f7/0x1860 fs/ext4/file.c:717 call_write_iter include/linux/fs.h:1956 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x650/0xe40 fs/read_write.c:584 ksys_write+0x12f/0x250 fs/read_write.c:637 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 -> #1 (&sb->s_type->i_mutex_key#8){++++}-{3:3}: down_read+0x9c/0x470 kernel/locking/rwsem.c:1520 inode_lock_shared include/linux/fs.h:812 [inline] ext4_bmap+0x4f/0x280 fs/ext4/inode.c:3089 bmap+0xae/0x120 fs/inode.c:1826 jbd2_journal_init_inode+0x80/0x3d0 fs/jbd2/journal.c:1669 ext4_open_inode_journal fs/ext4/super.c:5833 [inline] ext4_load_journal fs/ext4/super.c:5992 [inline] ext4_load_and_init_journal+0x266/0x28f0 fs/ext4/super.c:4906 __ext4_fill_super fs/ext4/super.c:5374 [inline] ext4_fill_super+0x8c4b/0xad30 fs/ext4/super.c:5703 get_tree_bdev+0x3b5/0x650 fs/super.c:1577 vfs_get_tree+0x8c/0x370 fs/super.c:1750 do_new_mount fs/namespace.c:3335 [inline] path_mount+0x1492/0x1ed0 fs/namespace.c:3662 init_mount+0xbf/0x110 fs/init.c:25 do_mount_root+0xdd/0x2c0 init/do_mounts.c:166 mount_root_generic+0x19a/0x460 init/do_mounts.c:205 mount_block_root init/do_mounts.c:378 [inline] mount_root+0x241/0x480 init/do_mounts.c:405 prepare_namespace+0xe3/0x3f0 init/do_mounts.c:489 kernel_init_freeable+0x703/0x900 init/main.c:1560 kernel_init+0x1c/0x2a0 init/main.c:1437 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 -> #0 (&type->s_umount_key#32){++++}-{3:3}: check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3868 [inline] __lock_acquire+0x2e3d/0x5de0 kernel/locking/lockdep.c:5136 lock_acquire kernel/locking/lockdep.c:5753 [inline] lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5718 down_read+0x9c/0x470 kernel/locking/rwsem.c:1520 __super_lock fs/super.c:58 [inline] super_lock+0x23c/0x380 fs/super.c:117 super_lock_shared fs/super.c:146 [inline] super_lock_shared_active fs/super.c:1431 [inline] fs_bdev_sync+0x94/0x1b0 fs/super.c:1466 blkdev_flushbuf block/ioctl.c:372 [inline] blkdev_common_ioctl+0x1550/0x1ce0 block/ioctl.c:502 compat_blkdev_ioctl+0x262/0x7c0 block/ioctl.c:684 __do_compat_sys_ioctl+0x2bf/0x330 fs/ioctl.c:972 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 other info that might help us debug this: Chain exists of: &type->s_umount_key#32 --> bdev_lock --> &bdev->bd_holder_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&bdev->bd_holder_lock); lock(bdev_lock); lock(&bdev->bd_holder_lock); rlock(&type->s_umount_key#32); *** DEADLOCK *** 1 lock held by syz-executor.3/5856: #0: ffff888015023a88 (&bdev->bd_holder_lock){+.+.}-{3:3}, at: blkdev_flushbuf block/ioctl.c:370 [inline] #0: ffff888015023a88 (&bdev->bd_holder_lock){+.+.}-{3:3}, at: blkdev_common_ioctl+0x14e9/0x1ce0 block/ioctl.c:502 stack backtrace: CPU: 3 PID: 5856 Comm: syz-executor.3 Not tainted 6.6.0-rc7-syzkaller-00012-ge017769f4ce2 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106 check_noncircular+0x311/0x3f0 kernel/locking/lockdep.c:2187 check_prev_add kernel/locking/lockdep.c:3134 [inline] check_prevs_add kernel/locking/lockdep.c:3253 [inline] validate_chain kernel/locking/lockdep.c:3868 [inline] __lock_acquire+0x2e3d/0x5de0 kernel/locking/lockdep.c:5136 lock_acquire kernel/locking/lockdep.c:5753 [inline] lock_acquire+0x1ae/0x510 kernel/locking/lockdep.c:5718 down_read+0x9c/0x470 kernel/locking/rwsem.c:1520 __super_lock fs/super.c:58 [inline] super_lock+0x23c/0x380 fs/super.c:117 super_lock_shared fs/super.c:146 [inline] super_lock_shared_active fs/super.c:1431 [inline] fs_bdev_sync+0x94/0x1b0 fs/super.c:1466 blkdev_flushbuf block/ioctl.c:372 [inline] blkdev_common_ioctl+0x1550/0x1ce0 block/ioctl.c:502 compat_blkdev_ioctl+0x262/0x7c0 block/ioctl.c:684 __do_compat_sys_ioctl+0x2bf/0x330 fs/ioctl.c:972 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline] __do_fast_syscall_32+0x61/0xe0 arch/x86/entry/common.c:178 do_fast_syscall_32+0x33/0x70 arch/x86/entry/common.c:203 entry_SYSENTER_compat_after_hwframe+0x70/0x82 RIP: 0023:0xf7fc5579 Code: b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 00 00 00 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00 RSP: 002b:00000000f7fc05ac EFLAGS: 00000292 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000001261 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess), 2 bytes skipped: 0: 10 06 adc %al,(%rsi) 2: 03 74 b4 01 add 0x1(%rsp,%rsi,4),%esi 6: 10 07 adc %al,(%rdi) 8: 03 74 b0 01 add 0x1(%rax,%rsi,4),%esi c: 10 08 adc %cl,(%rax) e: 03 74 d8 01 add 0x1(%rax,%rbx,8),%esi 1e: 00 51 52 add %dl,0x52(%rcx) 21: 55 push %rbp 22: 89 e5 mov %esp,%ebp 24: 0f 34 sysenter 26: cd 80 int $0x80 * 28: 5d pop %rbp <-- trapping instruction 29: 5a pop %rdx 2a: 59 pop %rcx 2b: c3 ret 2c: 90 nop 2d: 90 nop 2e: 90 nop 2f: 90 nop 30: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi 37: 8d b4 26 00 00 00 00 lea 0x0(%rsi,%riz,1),%esi