====================================================== WARNING: possible circular locking dependency detected 6.6.0-rc7-syzkaller-00039-g4f82870119a4 #0 Not tainted ------------------------------------------------------ syz-executor.3/14154 is trying to acquire lock: ffffffff8d0648e8 (bdev_lock){+.+.}-{3:3}, at: bd_prepare_to_claim+0x1b0/0x4c0 block/bdev.c:508 but task is already holding lock: ffff88814897f0c0 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:847 [inline] ffff88814897f0c0 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_discard block/ioctl.c:115 [inline] ffff88814897f0c0 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x1dd8/0x2860 block/ioctl.c:506 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (mapping.invalidate_lock#2){++++}-{3:3}: down_read+0xb1/0xa40 kernel/locking/rwsem.c:1520 filemap_invalidate_lock_shared include/linux/fs.h:857 [inline] filemap_fault+0x658/0x1710 mm/filemap.c:3283 __do_fault+0x133/0x4e0 mm/memory.c:4207 do_shared_fault mm/memory.c:4638 [inline] do_fault mm/memory.c:4712 [inline] do_pte_missing mm/memory.c:3672 [inline] handle_pte_fault mm/memory.c:4981 [inline] __handle_mm_fault mm/memory.c:5122 [inline] handle_mm_fault+0x21d9/0x62b0 mm/memory.c:5287 do_user_addr_fault arch/x86/mm/fault.c:1413 [inline] handle_page_fault arch/x86/mm/fault.c:1505 [inline] exc_page_fault+0x2ac/0x860 arch/x86/mm/fault.c:1561 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570 rep_movs_alternative+0x4a/0x70 arch/x86/lib/copy_user_64.S:65 copy_user_generic arch/x86/include/asm/uaccess_64.h:112 [inline] raw_copy_to_user arch/x86/include/asm/uaccess_64.h:133 [inline] _copy_to_user+0x86/0xa0 lib/usercopy.c:41 copy_to_user include/linux/uaccess.h:191 [inline] rng_dev_read+0x2f0/0x590 drivers/char/hw_random/core.c:255 do_loop_readv_writev fs/read_write.c:755 [inline] do_iter_read+0x576/0xdc0 fs/read_write.c:797 vfs_readv fs/read_write.c:915 [inline] do_preadv+0x212/0x350 fs/read_write.c:1007 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 -> #3 (&mm->mmap_lock){++++}-{3:3}: __might_fault+0xc1/0x120 mm/memory.c:5899 _copy_to_user+0x2a/0xa0 lib/usercopy.c:36 copy_to_user include/linux/uaccess.h:191 [inline] quota_getquota+0x560/0x6e0 fs/quota/quota.c:227 __do_sys_quotactl fs/quota/quota.c:961 [inline] __se_sys_quotactl+0x2c7/0xa30 fs/quota/quota.c:917 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 (&type->s_umount_key#30){++++}-{3:3}: down_read+0xb1/0xa40 kernel/locking/rwsem.c:1520 __super_lock fs/super.c:58 [inline] super_lock+0x176/0x390 fs/super.c:117 super_lock_shared fs/super.c:146 [inline] super_lock_shared_active fs/super.c:1431 [inline] fs_bdev_sync+0xa5/0x170 fs/super.c:1466 blkdev_flushbuf block/ioctl.c:372 [inline] blkdev_common_ioctl+0x889/0x2860 block/ioctl.c:502 blkdev_ioctl+0x520/0x730 block/ioctl.c:624 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xf8/0x170 fs/ioctl.c:857 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 (&bdev->bd_holder_lock){+.+.}-{3:3}: __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x136/0xd60 kernel/locking/mutex.c:747 bd_finish_claiming+0x231/0x3f0 block/bdev.c:566 blkdev_get_by_dev+0x481/0x620 block/bdev.c:799 setup_bdev_super+0x5d/0x600 fs/super.c:1484 mount_bdev+0x1e0/0x300 fs/super.c:1626 legacy_get_tree+0xef/0x190 fs/fs_context.c:662 vfs_get_tree+0x8c/0x280 fs/super.c:1750 do_new_mount+0x28f/0xae0 fs/namespace.c:3335 init_mount+0xd4/0x130 fs/init.c:25 do_mount_root+0x98/0x230 init/do_mounts.c:166 mount_root_generic+0x193/0x3b0 init/do_mounts.c:205 prepare_namespace+0xc2/0x100 init/do_mounts.c:489 kernel_init_freeable+0x46a/0x5c0 init/main.c:1560 kernel_init+0x1d/0x2a0 init/main.c:1437 ret_from_fork+0x48/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:304 -> #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:3868 [inline] __lock_acquire+0x39ff/0x7f70 kernel/locking/lockdep.c:5136 lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5753 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x136/0xd60 kernel/locking/mutex.c:747 bd_prepare_to_claim+0x1b0/0x4c0 block/bdev.c:508 truncate_bdev_range+0x4e/0x260 block/bdev.c:105 blk_ioctl_discard block/ioctl.c:116 [inline] blkdev_common_ioctl+0x1def/0x2860 block/ioctl.c:506 blkdev_ioctl+0x520/0x730 block/ioctl.c:624 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xf8/0x170 fs/ioctl.c:857 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 other info that might help us debug this: Chain exists of: bdev_lock --> &mm->mmap_lock --> mapping.invalidate_lock#2 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(mapping.invalidate_lock#2); lock(&mm->mmap_lock); lock(mapping.invalidate_lock#2); lock(bdev_lock); *** DEADLOCK *** 1 lock held by syz-executor.3/14154: #0: ffff88814897f0c0 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock include/linux/fs.h:847 [inline] #0: ffff88814897f0c0 (mapping.invalidate_lock#2){++++}-{3:3}, at: blk_ioctl_discard block/ioctl.c:115 [inline] #0: ffff88814897f0c0 (mapping.invalidate_lock#2){++++}-{3:3}, at: blkdev_common_ioctl+0x1dd8/0x2860 block/ioctl.c:506 stack backtrace: CPU: 1 PID: 14154 Comm: syz-executor.3 Not tainted 6.6.0-rc7-syzkaller-00039-g4f82870119a4 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/06/2023 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e7/0x2d0 lib/dump_stack.c:106 check_noncircular+0x375/0x4a0 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+0x39ff/0x7f70 kernel/locking/lockdep.c:5136 lock_acquire+0x1e3/0x520 kernel/locking/lockdep.c:5753 __mutex_lock_common kernel/locking/mutex.c:603 [inline] __mutex_lock+0x136/0xd60 kernel/locking/mutex.c:747 bd_prepare_to_claim+0x1b0/0x4c0 block/bdev.c:508 truncate_bdev_range+0x4e/0x260 block/bdev.c:105 blk_ioctl_discard block/ioctl.c:116 [inline] blkdev_common_ioctl+0x1def/0x2860 block/ioctl.c:506 blkdev_ioctl+0x520/0x730 block/ioctl.c:624 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl+0xf8/0x170 fs/ioctl.c:857 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 RIP: 0033:0x7f5d0727cae9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f5d07f420c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f5d0739c050 RCX: 00007f5d0727cae9 RDX: 0000000020000000 RSI: 0000000000001277 RDI: 0000000000000004 RBP: 00007f5d072c847a R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000006e R14: 00007f5d0739c050 R15: 00007ffc4a8163a8