====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.1.99/6345 is trying to acquire lock: ffffffff8ce648e8 (bdev_lock){+.+.}-{3:3}, at: bd_prepare_to_claim+0x1d9/0x4a0 block/bdev.c:523 but task is already holding lock: ffff88802009d010 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:849 [inline] ffff88802009d010 (mapping.invalidate_lock){++++}-{3:3}, at: blkdev_fallocate+0x22b/0x6a0 block/fops.c:789 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (mapping.invalidate_lock){++++}-{3:3}: down_write+0x97/0x200 kernel/locking/rwsem.c:1573 filemap_invalidate_lock include/linux/fs.h:849 [inline] set_blocksize+0x247/0x4b0 block/bdev.c:161 sb_set_blocksize block/bdev.c:178 [inline] sb_min_blocksize+0xbe/0x190 block/bdev.c:194 ext4_load_super fs/ext4/super.c:5047 [inline] __ext4_fill_super fs/ext4/super.c:5268 [inline] ext4_fill_super+0x6e7/0x6870 fs/ext4/super.c:5744 get_tree_bdev+0x3e5/0x520 fs/super.c:1591 vfs_get_tree+0x8c/0x280 fs/super.c:1764 do_new_mount+0x24a/0xa40 fs/namespace.c:3386 init_mount+0xde/0x130 fs/init.c:25 do_mount_root+0x97/0x230 init/do_mounts.c:166 mount_root_generic+0x1a6/0x3e0 init/do_mounts.c:205 prepare_namespace+0xc2/0x100 init/do_mounts.c:489 kernel_init_freeable+0x41a/0x560 init/main.c:1577 kernel_init+0x1d/0x1c0 init/main.c:1454 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 -> #3 (&sb->s_type->i_mutex_key#8){++++}-{3:3}: down_write+0x97/0x200 kernel/locking/rwsem.c:1573 inode_lock include/linux/fs.h:804 [inline] set_blocksize+0x1ff/0x4b0 block/bdev.c:160 sb_set_blocksize block/bdev.c:178 [inline] sb_min_blocksize+0xbe/0x190 block/bdev.c:194 ext4_load_super fs/ext4/super.c:5047 [inline] __ext4_fill_super fs/ext4/super.c:5268 [inline] ext4_fill_super+0x6e7/0x6870 fs/ext4/super.c:5744 get_tree_bdev+0x3e5/0x520 fs/super.c:1591 vfs_get_tree+0x8c/0x280 fs/super.c:1764 do_new_mount+0x24a/0xa40 fs/namespace.c:3386 init_mount+0xde/0x130 fs/init.c:25 do_mount_root+0x97/0x230 init/do_mounts.c:166 mount_root_generic+0x1a6/0x3e0 init/do_mounts.c:205 prepare_namespace+0xc2/0x100 init/do_mounts.c:489 kernel_init_freeable+0x41a/0x560 init/main.c:1577 kernel_init+0x1d/0x1c0 init/main.c:1454 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 -> #2 (&type->s_umount_key#32){++++}-{3:3}: down_read+0x46/0x2e0 kernel/locking/rwsem.c:1520 __super_lock fs/super.c:58 [inline] super_lock+0x189/0x390 fs/super.c:117 super_lock_shared fs/super.c:146 [inline] super_lock_shared_active fs/super.c:1442 [inline] fs_bdev_mark_dead+0xad/0x1f0 fs/super.c:1458 bdev_mark_dead+0x83/0x1a0 block/bdev.c:1026 blk_report_disk_dead+0x21c/0x3e0 block/genhd.c:568 del_gendisk+0x2cb/0x8f0 block/genhd.c:657 sd_remove+0x8d/0x100 drivers/scsi/sd.c:3817 device_remove drivers/base/dd.c:628 [inline] __device_release_driver drivers/base/dd.c:1351 [inline] device_release_driver_internal+0x458/0x6f0 drivers/base/dd.c:1374 bus_remove_device+0x43b/0x520 drivers/base/bus.c:624 device_del+0x51f/0x910 drivers/base/core.c:3889 __scsi_remove_device+0x1a2/0x390 drivers/scsi/scsi_sysfs.c:1489 scsi_forget_host+0xd0/0x110 drivers/scsi/scsi_scan.c:2035 scsi_remove_host+0x1b3/0x730 drivers/scsi/hosts.c:181 virtscsi_remove+0x130/0x1a0 drivers/scsi/virtio_scsi.c:941 virtio_dev_remove+0x96/0x1a0 drivers/virtio/virtio.c:332 device_remove drivers/base/dd.c:626 [inline] __device_release_driver drivers/base/dd.c:1351 [inline] device_release_driver_internal+0x408/0x6f0 drivers/base/dd.c:1374 bus_remove_device+0x43b/0x520 drivers/base/bus.c:624 device_del+0x51f/0x910 drivers/base/core.c:3889 device_unregister+0x20/0xc0 drivers/base/core.c:3930 unregister_virtio_device+0x37/0x60 drivers/virtio/virtio.c:483 virtio_pci_remove+0x7f/0xf0 drivers/virtio/virtio_pci_common.c:598 pci_device_remove+0x97/0x230 drivers/pci/pci-driver.c:483 device_remove drivers/base/dd.c:626 [inline] __device_release_driver drivers/base/dd.c:1351 [inline] device_release_driver_internal+0x408/0x6f0 drivers/base/dd.c:1374 unbind_store+0x1a1/0x1d0 drivers/base/bus.c:244 kernfs_fop_write_iter+0x3a4/0x520 fs/kernfs/file.c:352 call_write_iter include/linux/fs.h:2018 [inline] new_sync_write fs/read_write.c:491 [inline] vfs_write+0x474/0x9a0 fs/read_write.c:584 ksys_write+0x151/0x260 fs/read_write.c:637 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 -> #1 (&bdev->bd_holder_lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x135/0xc80 kernel/locking/mutex.c:747 bd_finish_claiming+0x229/0x3f0 block/bdev.c:581 blkdev_get_by_dev+0x469/0x610 block/bdev.c:814 bdev_open_by_dev+0x77/0x100 block/bdev.c:855 setup_bdev_super+0x59/0x660 fs/super.c:1496 mount_bdev+0x1ce/0x2c0 fs/super.c:1640 legacy_get_tree+0xea/0x180 fs/fs_context.c:662 vfs_get_tree+0x8c/0x280 fs/super.c:1764 do_new_mount+0x24a/0xa40 fs/namespace.c:3386 init_mount+0xde/0x130 fs/init.c:25 do_mount_root+0x97/0x230 init/do_mounts.c:166 mount_root_generic+0x1a6/0x3e0 init/do_mounts.c:205 prepare_namespace+0xc2/0x100 init/do_mounts.c:489 kernel_init_freeable+0x41a/0x560 init/main.c:1577 kernel_init+0x1d/0x1c0 init/main.c:1454 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:152 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:293 -> #0 (bdev_lock){+.+.}-{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:3869 [inline] __lock_acquire+0x37ef/0x7d80 kernel/locking/lockdep.c:5137 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x135/0xc80 kernel/locking/mutex.c:747 bd_prepare_to_claim+0x1d9/0x4a0 block/bdev.c:523 truncate_bdev_range+0x4e/0x260 block/bdev.c:105 blkdev_fallocate+0x50d/0x6a0 block/fops.c:798 vfs_fallocate+0x585/0x6f0 fs/open.c:324 ksys_fallocate fs/open.c:347 [inline] __do_sys_fallocate fs/open.c:355 [inline] __se_sys_fallocate fs/open.c:353 [inline] __x64_sys_fallocate+0xc1/0x110 fs/open.c:353 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 other info that might help us debug this: Chain exists of: bdev_lock --> &sb->s_type->i_mutex_key#8 --> mapping.invalidate_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(mapping.invalidate_lock); lock(&sb->s_type->i_mutex_key#8); lock(mapping.invalidate_lock); lock(bdev_lock); *** DEADLOCK *** 2 locks held by syz.1.99/6345: #0: ffff88802009ce80 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: inode_lock include/linux/fs.h:804 [inline] #0: ffff88802009ce80 (&sb->s_type->i_mutex_key#8){++++}-{3:3}, at: blkdev_fallocate+0x205/0x6a0 block/fops.c:788 #1: ffff88802009d010 (mapping.invalidate_lock){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:849 [inline] #1: ffff88802009d010 (mapping.invalidate_lock){++++}-{3:3}, at: blkdev_fallocate+0x22b/0x6a0 block/fops.c:789 stack backtrace: CPU: 0 PID: 6345 Comm: syz.1.99 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026 Call Trace: dump_stack_lvl+0x18c/0x250 lib/dump_stack.c:106 check_noncircular+0x2fc/0x400 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:3869 [inline] __lock_acquire+0x37ef/0x7d80 kernel/locking/lockdep.c:5137 lock_acquire+0x19e/0x420 kernel/locking/lockdep.c:5754 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x135/0xc80 kernel/locking/mutex.c:747 bd_prepare_to_claim+0x1d9/0x4a0 block/bdev.c:523 truncate_bdev_range+0x4e/0x260 block/bdev.c:105 blkdev_fallocate+0x50d/0x6a0 block/fops.c:798 vfs_fallocate+0x585/0x6f0 fs/open.c:324 ksys_fallocate fs/open.c:347 [inline] __do_sys_fallocate fs/open.c:355 [inline] __se_sys_fallocate fs/open.c:353 [inline] __x64_sys_fallocate+0xc1/0x110 fs/open.c:353 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xb0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7fe1cc79de99 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fe1cd6ba028 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 00007fe1cca25fa0 RCX: 00007fe1cc79de99 RDX: 0000000000000600 RSI: 0000000000000011 RDI: 0000000000000004 RBP: 00007fe1cc833eaf R08: 0000000000000000 R09: 0000000000000000 R10: 000000000007c000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe1cca26038 R14: 00007fe1cca25fa0 R15: 00007ffdc0edd4c8