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/16u3wNG5yzVrVg2JgCh02xnbl-Jhgixy9/view?usp=sharing kernel config: https://drive.google.com/file/d/1XD9WYDViQLSXN7RGwH8AGGDvP9JvOghx/view?usp=sharing C reproducer: https://drive.google.com/file/d/1aRcBubQfi5DpLd4GF1B3b9SzHCh6kV8-/view?usp=sharing Syzlang reproducer: https://drive.google.com/file/d/1HWH_QhAdw0_llycc4qYMwSXhH17BqB-m/view?usp=sharing If you fix this issue, please add the following tag to the commit: Reported-by: Hao Sun <sunhao.th@xxxxxxxxx> loop3: detected capacity change from 0 to 20480 FAULT_INJECTION: forcing a failure. name failslab, interval 1, probability 0, space 0, times 1 CPU: 0 PID: 8075 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_private_init drivers/base/core.c:3197 [inline] device_add+0x114a/0x2030 drivers/base/core.c:3247 device_create_groups_vargs+0x203/0x280 drivers/base/core.c:4014 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:00007f83625f8198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000059c0a0 RCX: 00000000004739cd RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000003 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000038 R13: 00007ffc4876caff R14: 00007ffc4876cca0 R15: 00007f83625f8300 ------------[ cut here ]------------ WARNING: CPU: 0 PID: 8075 at block/genhd.c:523 __device_add_disk+0xba9/0xd10 block/genhd.c:523 Modules linked in: CPU: 0 PID: 8075 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:ffffc90005a27dc0 EFLAGS: 00010212 RAX: 000000000002e311 RBX: ffff88810d55c380 RCX: 0000000000040000 RDX: ffffc900012e9000 RSI: ffff888102aa9cc0 RDI: 0000000000000002 R10: 0000000000000005 R11: fffffbfff1eb371f R12: 0000000000000001 FS: 00007f83625f8700(0000) GS:ffff888119e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 PKRU: 55555554 Call Trace: do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 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 RAX: ffffffffffffffda RBX: 000000000059c0a0 RCX: 00000000004739cd RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000003 RBP: 00007f83625f81d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000038 Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 8075 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 panic+0x306/0x73d kernel/panic.c:232 __warn.cold+0x20/0x2f kernel/panic.c:606 report_bug+0x273/0x300 lib/bug.c:199 exc_invalid_op+0x14/0x40 arch/x86/kernel/traps.c:259 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:566 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 RAX: 000000000002e311 RBX: ffff88810d55c380 RCX: 0000000000040000 RDX: ffffc900012e9000 RSI: ffff888102aa9cc0 RDI: 0000000000000002 RBP: ffff88810b438800 R08: ffffffff83c84189 R09: 0000000000000000 R10: 0000000000000005 R11: fffffbfff1eb371f R12: 0000000000000001 R13: ffff88810d55c85c R14: ffff88810b4388a0 R15: 0000000000000000 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:00007f83625f8198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000000000059c0a0 RCX: 00000000004739cd RDX: 0000000000000000 RSI: 0000000000004c80 RDI: 0000000000000003 RBP: 00007f83625f81d0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000038 R13: 00007ffc4876caff R14: 00007ffc4876cca0 R15: 00007f83625f8300 Dumping ftrace buffer: (ftrace buffer empty) Kernel Offset: disabled Rebooting in 1 seconds.. ---------------- Code disassembly (best guess): 0: 02 b8 ff ff ff ff add -0x1(%rax),%bh 6: c3 retq 7: 66 0f 1f 44 00 00 nopw 0x0(%rax,%rax,1) d: f3 0f 1e fa endbr64 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
