Hello, When using Healer to fuzz the latest Linux kernel, the following crash was triggered. HEAD commit: ff1ffd71d5f0 Merge tag 'hyperv-fixes-signed-20210915 git tree: upstream console output: https://drive.google.com/file/d/1cQP1i5Q3j9Pl_AhjWS9smo4hPdvT0psG/view?usp=sharing kernel config: https://drive.google.com/file/d/1zXpDhs-IdE7tX17B7MhaYP0VGUfP6m9B/view?usp=sharing C reproducer: https://drive.google.com/file/d/1MScGjVksMYc8ro56o0h26qEgiFMUYhB0/view?usp=sharing Syzlang reproducer: https://drive.google.com/file/d/10DAS3f9gacZwFY_rWLjNvRt2FqGjODRd/view?usp=sharing If you fix this issue, please add the following tag to the commit: Reported-by: Hao Sun <sunhao.th@xxxxxxxxx> FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 1 CPU: 3 PID: 7256 Comm: syz-executor Not tainted 5.15.0-rc1+ #18 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x8d/0xcf lib/dump_stack.c:106 fail_dump lib/fault-inject.c:52 [inline] should_fail+0x13c/0x160 lib/fault-inject.c:146 should_failslab+0x5/0x10 mm/slab_common.c:1328 slab_pre_alloc_hook.constprop.99+0x4e/0xc0 mm/slab.h:494 slab_alloc_node mm/slub.c:3120 [inline] slab_alloc mm/slub.c:3214 [inline] kmem_cache_alloc+0x44/0x280 mm/slub.c:3219 kmem_cache_zalloc include/linux/slab.h:711 [inline] __kernfs_new_node+0x68/0x350 fs/kernfs/dir.c:585 kernfs_new_node+0x5a/0x90 fs/kernfs/dir.c:647 __kernfs_create_file+0x56/0x150 fs/kernfs/file.c:985 sysfs_add_file_mode_ns+0xe6/0x290 fs/sysfs/file.c:317 create_files fs/sysfs/group.c:64 [inline] internal_create_group+0x186/0x4e0 fs/sysfs/group.c:149 internal_create_groups.part.4+0x4d/0xb0 fs/sysfs/group.c:189 internal_create_groups fs/sysfs/group.c:185 [inline] sysfs_create_groups+0x28/0x40 fs/sysfs/group.c:215 device_add_groups drivers/base/core.c:2438 [inline] device_add_attrs drivers/base/core.c:2592 [inline] device_add+0x4c3/0xc60 drivers/base/core.c:3310 device_add_disk+0x178/0x4f0 block/genhd.c:446 add_disk include/linux/genhd.h:221 [inline] loop_add+0x27c/0x3a0 drivers/block/loop.c:2397 loop_control_ioctl+0x72/0x290 drivers/block/loop.c:2512 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0xb6/0x100 fs/ioctl.c:860 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x34/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x46ae99 Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f91b3049c48 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000078c0a0 RCX: 000000000046ae99 RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000003 RBP: 00007f91b3049c80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000042 R13: 0000000000000000 R14: 000000000078c0a0 R15: 00007ffeef5d14f0 ------------[ cut here ]------------ WARNING: CPU: 3 PID: 7256 at block/genhd.c:537 device_add_disk+0x237/0x4f0 block/genhd.c:537 Modules linked in: CPU: 3 PID: 7256 Comm: syz-executor Not tainted 5.15.0-rc1+ #18 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014 RIP: 0010:device_add_disk+0x237/0x4f0 block/genhd.c:537 Code: 00 0f 85 e7 fe ff ff e9 ce fe ff ff e8 12 6e 15 ff 48 89 df e8 4a 35 01 00 81 3b 03 01 00 00 0f 84 b5 fe ff ff e8 f9 6d 15 ff <0f> 0b bd 01 00 00 00 e9 c5 fe ff ff e8 e8 6d 15 ff 0f 0b bd ea ff RSP: 0018:ffffc90003e67e70 EFLAGS: 00010216 RAX: 0000000000023106 RBX: ffff8880192b0400 RCX: ffffc90001241000 RDX: 0000000000040000 RSI: ffffffff82222407 RDI: ffffffff853cbf06 RBP: 00000000fffffff4 R08: 0000000000000001 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000000000 R12: ffff88800d219680 R13: 0000000000000000 R14: 0000000000000000 R15: ffff88800d2196c0 FS: 00007f91b304a700(0000) GS:ffff88813dd00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007efde803d148 CR3: 0000000018ef7000 CR4: 0000000000750ee0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 PKRU: 55555554 loop_control_ioctl+0x72/0x290 drivers/block/loop.c:2512 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:874 [inline] __se_sys_ioctl fs/ioctl.c:860 [inline] __x64_sys_ioctl+0xb6/0x100 fs/ioctl.c:860 entry_SYSCALL_64_after_hwframe+0x44/0xae Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 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 bc ff ff ff f7 d8 64 89 01 48 RAX: ffffffffffffffda RBX: 000000000078c0a0 RCX: 000000000046ae99 RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000003 RBP: 00007f91b3049c80 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000042 R13: 0000000000000000 R14: 000000000078c0a0 R15: 00007ffeef5d14f0 ---------------- Code disassembly (best guess): 0: f7 d8 neg %eax 2: 64 89 02 mov %eax,%fs:(%rdx) 5: b8 ff ff ff ff mov $0xffffffff,%eax a: c3 retq b: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1) 11: 48 89 f8 mov %rdi,%rax 14: 48 89 f7 mov %rsi,%rdi 17: 48 89 d6 mov %rdx,%rsi 1a: 48 89 ca mov %rcx,%rdx 1d: 4d 89 c2 mov %r8,%r10 20: 4d 89 c8 mov %r9,%r8 23: 4c 8b 4c 24 08 mov 0x8(%rsp),%r9 28: 0f 05 syscall * 2a: 48 3d 01 f0 ff ff cmp $0xfffffffffffff001,%rax <-- trapping instruction 30: 73 01 jae 0x33 32: c3 retq 33: 48 c7 c1 bc ff ff ff mov $0xffffffffffffffbc,%rcx 3a: f7 d8 neg %eax 3c: 64 89 01 mov %eax,%fs:(%rcx) 3f: 48 rex.W
