------------[ cut here ]------------ !list_empty(&mtd->part.node) WARNING: drivers/mtd/mtdpart.c:37 at release_mtd_partition+0x71/0x90 drivers/mtd/mtdpart.c:37, CPU#3: syz.0.356/7236 Modules linked in: CPU: 3 UID: 0 PID: 7236 Comm: syz.0.356 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:release_mtd_partition+0x71/0x90 drivers/mtd/mtdpart.c:37 Code: 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 75 1e 48 8b 7b 38 e8 cf 5c dd fb 48 89 df 5b 5d e9 c5 5c dd fb e8 80 17 7e fb 90 <0f> 0b 90 eb c2 e8 d5 71 e9 fb eb db 48 89 ef e8 cb 71 e9 fb eb a5 RSP: 0018:ffffc90002e379c0 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff88801407d000 RCX: ffffffff8b879df3 RDX: ffff888029914900 RSI: ffffffff8689e1a0 RDI: ffff88801407d000 RBP: ffff88801407d650 R08: 0000000000000005 R09: 0000000000000000 R10: 0000000000000004 R11: 0000000000000000 R12: 0000000000000000 R13: dffffc0000000000 R14: ffff888020ff6000 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff888097451000(0063) knlGS:00000000f5416b40 CS: 0010 DS: 002b ES: 002b CR0: 0000000080050033 CR2: 00000000f72f44c0 CR3: 000000005f09f000 CR4: 0000000000352ef0 Call Trace: mtd_release+0xa0/0xd0 drivers/mtd/mtdcore.c:101 device_release+0xa4/0x240 drivers/base/core.c:2565 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x1f7/0x640 lib/kobject.c:737 put_device+0x1f/0x30 drivers/base/core.c:3797 add_mtd_device+0xbd7/0x17a0 drivers/mtd/mtdcore.c:802 mtd_add_partition+0x30a/0x660 drivers/mtd/mtdpart.c:279 mtdchar_blkpg_ioctl+0x207/0x250 drivers/mtd/mtdchar.c:562 mtdchar_compat_ioctl+0x3d6/0x440 drivers/mtd/mtdchar.c:1322 __do_compat_sys_ioctl fs/ioctl.c:695 [inline] __se_compat_sys_ioctl fs/ioctl.c:638 [inline] __ia32_compat_sys_ioctl+0x2cf/0x360 fs/ioctl.c:638 do_syscall_32_irqs_on arch/x86/entry/syscall_32.c:83 [inline] __do_fast_syscall_32+0xe3/0x8c0 arch/x86/entry/syscall_32.c:307 do_fast_syscall_32+0x32/0x70 arch/x86/entry/syscall_32.c:332 entry_SYSENTER_compat_after_hwframe+0x84/0x8e RIP: 0023:0xf7f58f6c Code: d2 74 05 c1 e8 0c 89 02 8b 5d fc 31 c0 c9 c3 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1f 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 58 b8 77 00 00 00 cd 80 0f 0b 8d b6 00 00 00 00 b8 ad RSP: 002b:00000000f541650c EFLAGS: 00000292 ORIG_RAX: 0000000000000036 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 0000000000001269 RDX: 0000000080000040 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000292 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 ---------------- Code disassembly (best guess): 0: d2 74 05 c1 shlb %cl,-0x3f(%rbp,%rax,1) 4: e8 0c 89 02 8b call 0x8b028915 9: 5d pop %rbp a: fc cld b: 31 c0 xor %eax,%eax d: c9 leave e: c3 ret f: 90 nop 10: 90 nop 11: 90 nop 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 18: 90 nop 19: 90 nop 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 90 nop 1e: 0f 1f 00 nopl (%rax) 21: 51 push %rcx 22: 52 push %rdx 23: 55 push %rbp 24: 89 e5 mov %esp,%ebp 26: 0f 34 sysenter 28: cd 80 int $0x80 * 2a: 5d pop %rbp <-- trapping instruction 2b: 5a pop %rdx 2c: 59 pop %rcx 2d: c3 ret 2e: 58 pop %rax 2f: b8 77 00 00 00 mov $0x77,%eax 34: cd 80 int $0x80 36: 0f 0b ud2 38: 8d b6 00 00 00 00 lea 0x0(%rsi),%esi 3e: b8 .byte 0xb8 3f: ad lods %ds:(%rsi),%eax