Hello, When using Healer to fuzz the latest Linux kernel, the following crash was triggered. HEAD commit: 7d2a07b76933 Linux 5.14 git tree: upstream console output: https://drive.google.com/file/d/1lL94fy2uAtUMlfTnDDI6ooGLUGGvlDwl/view?usp=sharing kernel config: https://drive.google.com/file/d/1XD9WYDViQLSXN7RGwH8AGGDvP9JvOghx/view?usp=sharing C reproducer: https://drive.google.com/file/d/12LXTfEg30h-Y6s5smCLIP7Jtr3g6PFOK/view?usp=sharing Syzlang reproducer: https://drive.google.com/file/d/1mUCxjzeD5w2bOjuw80srDBwpCh0zSpdW/view?usp=sharing If you fix this issue, please add the following tag to the commit: Reported-by: Hao Sun <sunhao.th@xxxxxxxxx> oop4: detected capacity change from 0 to 20480 ISOFS: Unable to identify CD-ROM format. FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 0 CPU: 0 PID: 10131 Comm: syz-executor Not tainted 5.14.0 #25 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x8b/0xb3 lib/dump_stack.c:105 fail_dump lib/fault-inject.c:52 [inline] should_fail.cold+0x5/0xa lib/fault-inject.c:146 should_failslab+0x5/0x10 mm/slab_common.c:1326 slab_pre_alloc_hook mm/slab.h:494 [inline] slab_alloc_node mm/slub.c:2880 [inline] slab_alloc mm/slub.c:2967 [inline] kmem_cache_alloc_trace+0x62/0x350 mm/slub.c:2984 kmalloc include/linux/slab.h:591 [inline] kzalloc include/linux/slab.h:721 [inline] device_create_groups_vargs+0x8a/0x280 drivers/base/core.c:3996 device_create+0xdf/0x120 drivers/base/core.c:4056 bdi_register_va.part.0+0x9c/0x800 mm/backing-dev.c:871 bdi_register_va mm/backing-dev.c:906 [inline] bdi_register+0x12a/0x140 mm/backing-dev.c:903 __device_add_disk+0x923/0xd10 block/genhd.c:521 add_disk include/linux/genhd.h:217 [inline] loop_add+0x6ec/0x8c0 drivers/block/loop.c:2395 loop_control_ioctl+0x130/0x3c0 drivers/block/loop.c:2492 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:1069 [inline] __se_sys_ioctl fs/ioctl.c:1055 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:1055 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4739cd Code: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6e331da198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000059c0a0 RCX: 00000000004739cd RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000003 RBP: 00007f6e331da1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000030 R13: 00007ffe496b21bf R14: 00007ffe496b2360 R15: 00007f6e331da300 ------------[ cut here ]------------ WARNING: CPU: 1 PID: 10131 at block/genhd.c:523 __device_add_disk+0xba9/0xd10 block/genhd.c:523 Modules linked in: CPU: 1 PID: 10131 Comm: syz-executor Not tainted 5.14.0 #25 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.13.0-1ubuntu1.1 04/01/2014 RIP: 0010:__device_add_disk+0xba9/0xd10 block/genhd.c:523 Code: fd ff ff 4c 89 ef 89 44 24 28 e8 22 a5 f3 fd 8b 44 24 28 e9 6f fd ff ff 4c 89 ef e8 a1 a4 f3 fd e9 d5 fd ff ff e8 f7 b6 ac fd <0f> 0b e9 8c fd ff ff 48 8b 7c 24 08 e8 96 a4 f3 fd e9 0a f6 ff ff RSP: 0018:ffffc90006527dc0 EFLAGS: 00010216 RAX: 0000000000027667 RBX: ffff888107d54ec0 RCX: 0000000000040000 RDX: ffffc90000889000 RSI: ffff888104715640 RDI: 0000000000000002 RBP: ffff888110beb400 R08: ffffffff83c84189 R09: 0000000000000000 R10: 0000000000000005 R11: fffffbfff17578ea R12: 0000000000000001 R13: ffff888107d5539c R14: ffff888110beb4a0 R15: 0000000000000000 FS: 00007f6e331da700(0000) GS:ffff888119f00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00005572256db150 CR3: 0000000104b9f006 CR4: 0000000000770ee0 PKRU: 55555554 Call Trace: add_disk include/linux/genhd.h:217 [inline] loop_add+0x6ec/0x8c0 drivers/block/loop.c:2395 loop_control_ioctl+0x130/0x3c0 drivers/block/loop.c:2492 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:1069 [inline] __se_sys_ioctl fs/ioctl.c:1055 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:1055 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4739cd Code: 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f6e331da198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000059c0a0 RCX: 00000000004739cd RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000003 RBP: 00007f6e331da1d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000030 R13: 00007ffe496b21bf R14: 00007ffe496b2360 R15: 00007f6e331da300
