EXT4-fs (loop3): Remounting filesystem read-only Quota error (device loop3): write_blk: dquota write failed Quota error (device loop3): qtree_write_dquot: Error -117 occurred while creating quota general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] CPU: 1 PID: 21142 Comm: syz.3.4524 Not tainted syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:ext4_ext_drop_refs fs/ext4/extents.c:119 [inline] RIP: 0010:ext4_free_ext_path fs/ext4/extents.c:128 [inline] RIP: 0010:ext4_ext_map_blocks+0x2d04/0x6800 fs/ext4/extents.c:4498 Code: 8b 04 24 89 18 89 9c 24 38 01 00 00 4c 8b 7c 24 10 4d 85 ff 0f 84 bd 00 00 00 e8 c7 e0 58 ff 49 8d 7f 08 48 89 f8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 3d 1e 00 00 41 0f b7 47 08 c1 e0 04 48 RSP: 0018:ffffc90003a26ee0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000080000 RDX: ffffc9000eef0000 RSI: 0000000000064471 RDI: 0000000000000003 RBP: ffffc90003a27190 R08: ffffffff8e8b15ef R09: 1ffffffff1d162bd R10: dffffc0000000000 R11: fffffbfff1d162be R12: 0000000000000001 R13: 1ffff92000744e08 R14: dffffc0000000000 R15: fffffffffffffffb FS: 00007f7e26c596c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000020000019f030 CR3: 000000002f942000 CR4: 00000000003506e0 Call Trace: ext4_map_blocks+0x9e2/0x1b80 fs/ext4/inode.c:654 ext4_getblk+0x1d0/0x6f0 fs/ext4/inode.c:864 ext4_bread+0x2a/0x170 fs/ext4/inode.c:920 ext4_quota_write+0x23a/0x580 fs/ext4/super.c:7317 v2_write_file_info+0x24d/0x3b0 fs/quota/quota_v2.c:213 dquot_acquire+0x477/0x610 fs/quota/dquot.c:477 ext4_acquire_dquot+0x2e3/0x4b0 fs/ext4/super.c:6949 dqget+0x77c/0xeb0 fs/quota/dquot.c:990 __dquot_initialize+0x3c7/0xcd0 fs/quota/dquot.c:1518 ext4_process_orphan+0x54/0x300 fs/ext4/orphan.c:327 ext4_orphan_cleanup+0xbec/0x1420 fs/ext4/orphan.c:472 __ext4_fill_super fs/ext4/super.c:5621 [inline] ext4_fill_super+0x5eea/0x67b0 fs/ext4/super.c:5744 get_tree_bdev+0x3f3/0x520 fs/super.c:1591 vfs_get_tree+0x8c/0x280 fs/super.c:1764 do_new_mount+0x24b/0xa40 fs/namespace.c:3386 do_mount fs/namespace.c:3726 [inline] __do_sys_mount fs/namespace.c:3935 [inline] __se_sys_mount+0x2e7/0x3d0 fs/namespace.c:3912 do_syscall_x64 arch/x86/entry/common.c:46 [inline] do_syscall_64+0x55/0xa0 arch/x86/entry/common.c:76 entry_SYSCALL_64_after_hwframe+0x68/0xd2 RIP: 0033:0x7f7e25d9da8a Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007f7e26c58e58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f7e26c58ee0 RCX: 00007f7e25d9da8a RDX: 0000200000000140 RSI: 0000200000000040 RDI: 00007f7e26c58ea0 RBP: 0000200000000140 R08: 00007f7e26c58ee0 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000200000000040 R13: 00007f7e26c58ea0 R14: 0000000000000605 R15: 000000000000002c Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:ext4_ext_drop_refs fs/ext4/extents.c:119 [inline] RIP: 0010:ext4_free_ext_path fs/ext4/extents.c:128 [inline] RIP: 0010:ext4_ext_map_blocks+0x2d04/0x6800 fs/ext4/extents.c:4498 Code: 8b 04 24 89 18 89 9c 24 38 01 00 00 4c 8b 7c 24 10 4d 85 ff 0f 84 bd 00 00 00 e8 c7 e0 58 ff 49 8d 7f 08 48 89 f8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 3d 1e 00 00 41 0f b7 47 08 c1 e0 04 48 RSP: 0018:ffffc90003a26ee0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000080000 RDX: ffffc9000eef0000 RSI: 0000000000064471 RDI: 0000000000000003 RBP: ffffc90003a27190 R08: ffffffff8e8b15ef R09: 1ffffffff1d162bd R10: dffffc0000000000 R11: fffffbfff1d162be R12: 0000000000000001 R13: 1ffff92000744e08 R14: dffffc0000000000 R15: fffffffffffffffb FS: 00007f7e26c596c0(0000) GS:ffff8880b8f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055558fb3da28 CR3: 000000002f942000 CR4: 00000000003506e0 ---------------- Code disassembly (best guess): 0: 8b 04 24 mov (%rsp),%eax 3: 89 18 mov %ebx,(%rax) 5: 89 9c 24 38 01 00 00 mov %ebx,0x138(%rsp) c: 4c 8b 7c 24 10 mov 0x10(%rsp),%r15 11: 4d 85 ff test %r15,%r15 14: 0f 84 bd 00 00 00 je 0xd7 1a: e8 c7 e0 58 ff call 0xff58e0e6 1f: 49 8d 7f 08 lea 0x8(%r15),%rdi 23: 48 89 f8 mov %rdi,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 0f b6 04 30 movzbl (%rax,%r14,1),%eax <-- trapping instruction 2f: 84 c0 test %al,%al 31: 0f 85 3d 1e 00 00 jne 0x1e74 37: 41 0f b7 47 08 movzwl 0x8(%r15),%eax 3c: c1 e0 04 shl $0x4,%eax 3f: 48 rex.W