BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 7 scanned by syz-executor.4 (18218) ================================================================== BUG: KASAN: slab-out-of-bounds in squashfs_get_id+0x1ae/0x1d0 syzkaller/managers/linux-4-19/kernel/fs/squashfs/id.c:51 Read of size 8 at addr ffff8880a97af220 by task syz-executor.1/18258 CPU: 1 PID: 18258 Comm: syz-executor.1 Not tainted 4.19.172-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack syzkaller/managers/linux-4-19/kernel/lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef syzkaller/managers/linux-4-19/kernel/lib/dump_stack.c:118 print_address_description.cold+0x54/0x219 syzkaller/managers/linux-4-19/kernel/mm/kasan/report.c:256 kasan_report_error.cold+0x8a/0x1b9 syzkaller/managers/linux-4-19/kernel/mm/kasan/report.c:354 kasan_report syzkaller/managers/linux-4-19/kernel/mm/kasan/report.c:412 [inline] __asan_report_load8_noabort+0x88/0x90 syzkaller/managers/linux-4-19/kernel/mm/kasan/report.c:433 squashfs_get_id+0x1ae/0x1d0 syzkaller/managers/linux-4-19/kernel/fs/squashfs/id.c:51 squashfs_new_inode syzkaller/managers/linux-4-19/kernel/fs/squashfs/inode.c:64 [inline] squashfs_read_inode+0x1b4/0x1b40 syzkaller/managers/linux-4-19/kernel/fs/squashfs/inode.c:133 BTRFS warning (device ): duplicate device /dev/loop4 devid 1 generation 7 scanned by systemd-udevd (17922) squashfs_fill_super+0x1655/0x1c00 syzkaller/managers/linux-4-19/kernel/fs/squashfs/super.c:318 mount_bdev+0x2fc/0x3b0 syzkaller/managers/linux-4-19/kernel/fs/super.c:1158 mount_fs+0xa3/0x310 syzkaller/managers/linux-4-19/kernel/fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 syzkaller/managers/linux-4-19/kernel/fs/namespace.c:961 vfs_kern_mount syzkaller/managers/linux-4-19/kernel/fs/namespace.c:951 [inline] do_new_mount syzkaller/managers/linux-4-19/kernel/fs/namespace.c:2469 [inline] do_mount+0x113c/0x2f10 syzkaller/managers/linux-4-19/kernel/fs/namespace.c:2799 BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 7 scanned by syz-executor.2 (18267) ksys_mount+0xcf/0x130 syzkaller/managers/linux-4-19/kernel/fs/namespace.c:3015 __do_sys_mount syzkaller/managers/linux-4-19/kernel/fs/namespace.c:3029 [inline] __se_sys_mount syzkaller/managers/linux-4-19/kernel/fs/namespace.c:3026 [inline] __x64_sys_mount+0xba/0x150 syzkaller/managers/linux-4-19/kernel/fs/namespace.c:3026 do_syscall_64+0xf9/0x620 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x46702a Code: 48 c7 c2 bc ff ff ff f7 d8 64 89 02 b8 ff ff ff ff eb d2 e8 b8 04 00 00 0f 1f 84 00 00 00 00 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fdbecea0fa8 EFLAGS: 00000206 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 0000000020000200 RCX: 000000000046702a RDX: 0000000020000000 RSI: 0000000020000100 RDI: 00007fdbecea1000 RBP: 00007fdbecea1040 R08: 00007fdbecea1040 R09: 0000000020000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000020000000 R13: 0000000020000100 R14: 00007fdbecea1000 R15: 0000000020000240 Allocated by task 25877: kmem_cache_alloc_trace+0x12f/0x380 syzkaller/managers/linux-4-19/kernel/mm/slab.c:3625 kmalloc syzkaller/managers/linux-4-19/kernel/./include/linux/slab.h:515 [inline] kzalloc syzkaller/managers/linux-4-19/kernel/./include/linux/slab.h:709 [inline] alloc_workqueue_attrs syzkaller/managers/linux-4-19/kernel/kernel/workqueue.c:3241 [inline] apply_wqattrs_prepare+0x1c4/0xa50 syzkaller/managers/linux-4-19/kernel/kernel/workqueue.c:3753 apply_workqueue_attrs_locked+0xc5/0x120 syzkaller/managers/linux-4-19/kernel/kernel/workqueue.c:3862 apply_workqueue_attrs syzkaller/managers/linux-4-19/kernel/kernel/workqueue.c:3895 [inline] alloc_and_link_pwqs syzkaller/managers/linux-4-19/kernel/kernel/workqueue.c:4011 [inline] __alloc_workqueue_key+0x510/0xed0 syzkaller/managers/linux-4-19/kernel/kernel/workqueue.c:4124 __btrfs_alloc_workqueue+0x40c/0x6c0 syzkaller/managers/linux-4-19/kernel/fs/btrfs/async-thread.c:146 btrfs_alloc_workqueue+0x7b/0x490 syzkaller/managers/linux-4-19/kernel/fs/btrfs/async-thread.c:175 btrfs_init_workqueues syzkaller/managers/linux-4-19/kernel/fs/btrfs/disk-io.c:2187 [inline] open_ctree+0x2c59/0x61e0 syzkaller/managers/linux-4-19/kernel/fs/btrfs/disk-io.c:2924 btrfs_fill_super syzkaller/managers/linux-4-19/kernel/fs/btrfs/super.c:1209 [inline] btrfs_mount_root+0x12e5/0x1830 syzkaller/managers/linux-4-19/kernel/fs/btrfs/super.c:1613 mount_fs+0xa3/0x310 syzkaller/managers/linux-4-19/kernel/fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 syzkaller/managers/linux-4-19/kernel/fs/namespace.c:961 vfs_kern_mount+0x3c/0x60 syzkaller/managers/linux-4-19/kernel/fs/namespace.c:951 btrfs_mount+0x23a/0xaa0 syzkaller/managers/linux-4-19/kernel/fs/btrfs/super.c:1681 mount_fs+0xa3/0x310 syzkaller/managers/linux-4-19/kernel/fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 syzkaller/managers/linux-4-19/kernel/fs/namespace.c:961 vfs_kern_mount syzkaller/managers/linux-4-19/kernel/fs/namespace.c:951 [inline] do_new_mount syzkaller/managers/linux-4-19/kernel/fs/namespace.c:2469 [inline] do_mount+0x113c/0x2f10 syzkaller/managers/linux-4-19/kernel/fs/namespace.c:2799 ksys_mount+0xcf/0x130 syzkaller/managers/linux-4-19/kernel/fs/namespace.c:3015 __do_sys_mount syzkaller/managers/linux-4-19/kernel/fs/namespace.c:3029 [inline] __se_sys_mount syzkaller/managers/linux-4-19/kernel/fs/namespace.c:3026 [inline] __x64_sys_mount+0xba/0x150 syzkaller/managers/linux-4-19/kernel/fs/namespace.c:3026 do_syscall_64+0xf9/0x620 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 25877: __cache_free syzkaller/managers/linux-4-19/kernel/mm/slab.c:3503 [inline] kfree+0xcc/0x210 syzkaller/managers/linux-4-19/kernel/mm/slab.c:3822 free_workqueue_attrs syzkaller/managers/linux-4-19/kernel/kernel/workqueue.c:3224 [inline] apply_wqattrs_prepare+0x751/0xa50 syzkaller/managers/linux-4-19/kernel/kernel/workqueue.c:3800 apply_workqueue_attrs_locked+0xc5/0x120 syzkaller/managers/linux-4-19/kernel/kernel/workqueue.c:3862 apply_workqueue_attrs syzkaller/managers/linux-4-19/kernel/kernel/workqueue.c:3895 [inline] alloc_and_link_pwqs syzkaller/managers/linux-4-19/kernel/kernel/workqueue.c:4011 [inline] __alloc_workqueue_key+0x510/0xed0 syzkaller/managers/linux-4-19/kernel/kernel/workqueue.c:4124 __btrfs_alloc_workqueue+0x40c/0x6c0 syzkaller/managers/linux-4-19/kernel/fs/btrfs/async-thread.c:146 btrfs_alloc_workqueue+0x7b/0x490 syzkaller/managers/linux-4-19/kernel/fs/btrfs/async-thread.c:175 btrfs_init_workqueues syzkaller/managers/linux-4-19/kernel/fs/btrfs/disk-io.c:2187 [inline] open_ctree+0x2c59/0x61e0 syzkaller/managers/linux-4-19/kernel/fs/btrfs/disk-io.c:2924 btrfs_fill_super syzkaller/managers/linux-4-19/kernel/fs/btrfs/super.c:1209 [inline] btrfs_mount_root+0x12e5/0x1830 syzkaller/managers/linux-4-19/kernel/fs/btrfs/super.c:1613 mount_fs+0xa3/0x310 syzkaller/managers/linux-4-19/kernel/fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 syzkaller/managers/linux-4-19/kernel/fs/namespace.c:961 vfs_kern_mount+0x3c/0x60 syzkaller/managers/linux-4-19/kernel/fs/namespace.c:951 btrfs_mount+0x23a/0xaa0 syzkaller/managers/linux-4-19/kernel/fs/btrfs/super.c:1681 mount_fs+0xa3/0x310 syzkaller/managers/linux-4-19/kernel/fs/super.c:1261 vfs_kern_mount.part.0+0x68/0x470 syzkaller/managers/linux-4-19/kernel/fs/namespace.c:961 vfs_kern_mount syzkaller/managers/linux-4-19/kernel/fs/namespace.c:951 [inline] do_new_mount syzkaller/managers/linux-4-19/kernel/fs/namespace.c:2469 [inline] do_mount+0x113c/0x2f10 syzkaller/managers/linux-4-19/kernel/fs/namespace.c:2799 ksys_mount+0xcf/0x130 syzkaller/managers/linux-4-19/kernel/fs/namespace.c:3015 __do_sys_mount syzkaller/managers/linux-4-19/kernel/fs/namespace.c:3029 [inline] __se_sys_mount syzkaller/managers/linux-4-19/kernel/fs/namespace.c:3026 [inline] __x64_sys_mount+0xba/0x150 syzkaller/managers/linux-4-19/kernel/fs/namespace.c:3026 do_syscall_64+0xf9/0x620 syzkaller/managers/linux-4-19/kernel/arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe The buggy address belongs to the object at ffff8880a97af200 which belongs to the cache kmalloc-32 of size 32 The buggy address is located 0 bytes to the right of 32-byte region [ffff8880a97af200, ffff8880a97af220) The buggy address belongs to the page: page:ffffea0002a5ebc0 count:1 mapcount:0 mapping:ffff88813bff01c0 index:0xffff8880a97affc1 flags: 0xfff00000000100(slab) raw: 00fff00000000100 ffffea0002d24108 ffffea0002a79ec8 ffff88813bff01c0 raw: ffff8880a97affc1 ffff8880a97af000 0000000100000029 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8880a97af100: fb fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc ffff8880a97af180: fb fb fb fb fc fc fc fc 00 fc fc fc fc fc fc fc >ffff8880a97af200: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc ^ ffff8880a97af280: 00 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc ffff8880a97af300: 00 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc ================================================================== BTRFS warning (device ): duplicate device /dev/loop2 devid 1 generation 7 scanned by systemd-udevd (17913)