Oops: divide error: 0000 [#1] SMP KASAN NOPTI CPU: 0 UID: 0 PID: 5325 Comm: syz.0.0 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:add_device drivers/mtd/devices/block2mtd.c:296 [inline] RIP: 0010:block2mtd_setup2+0x592/0xda0 drivers/mtd/devices/block2mtd.c:459 Code: 48 8b 74 24 30 48 63 ce 48 89 d8 48 09 c8 48 c1 e8 20 4c 8b 64 24 10 74 0d 48 89 d8 48 99 48 f7 f9 49 89 d5 eb 09 89 d8 31 d2 f6 41 89 d5 31 ff 4c 89 ee e8 1f da 39 fb 4d 85 ed 0f 85 90 04 RSP: 0018:ffffc9000f26f9a0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001f00000 RBP: ffffc9000f26fb98 R08: ffff8880353962ef R09: 1ffff11006a72c5d R10: dffffc0000000000 R11: ffffed1006a72c5e R12: 0000000000000000 R13: ffff88801d02d0b4 R14: ffff8880122be000 R15: ffff8880122be000 FS: 00007fa7d8c5d6c0(0000) GS:ffff88808c540000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fa7d801bb30 CR3: 000000003fb3c000 CR4: 0000000000352ef0 Call Trace: block2mtd_setup+0x27/0xe0 drivers/mtd/devices/block2mtd.c:476 param_attr_store+0x214/0x310 kernel/params.c:589 module_attr_store+0x65/0x90 kernel/params.c:904 kernfs_fop_write_iter+0x3a4/0x540 fs/kernfs/file.c:345 new_sync_write fs/read_write.c:595 [inline] vfs_write+0x612/0xba0 fs/read_write.c:687 ksys_write+0x150/0x270 fs/read_write.c:739 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa7d7d9e019 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 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 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa7d8c5cfe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fa7d8025fa0 RCX: 00007fa7d7d9e019 RDX: 000000000000000c RSI: 00002000000000c0 RDI: 0000000000000003 RBP: 00007fa7d7e3500c R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa7d8026038 R14: 00007fa7d8025fa0 R15: 00007ffe5587a628 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:add_device drivers/mtd/devices/block2mtd.c:296 [inline] RIP: 0010:block2mtd_setup2+0x592/0xda0 drivers/mtd/devices/block2mtd.c:459 Code: 48 8b 74 24 30 48 63 ce 48 89 d8 48 09 c8 48 c1 e8 20 4c 8b 64 24 10 74 0d 48 89 d8 48 99 48 f7 f9 49 89 d5 eb 09 89 d8 31 d2 f6 41 89 d5 31 ff 4c 89 ee e8 1f da 39 fb 4d 85 ed 0f 85 90 04 RSP: 0018:ffffc9000f26f9a0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000001f00000 RBP: ffffc9000f26fb98 R08: ffff8880353962ef R09: 1ffff11006a72c5d R10: dffffc0000000000 R11: ffffed1006a72c5e R12: 0000000000000000 R13: ffff88801d02d0b4 R14: ffff8880122be000 R15: ffff8880122be000 FS: 00007fa7d8c5d6c0(0000) GS:ffff88808c540000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffee237bf52 CR3: 000000003fb3c000 CR4: 0000000000352ef0 ---------------- Code disassembly (best guess): 0: 48 8b 74 24 30 mov 0x30(%rsp),%rsi 5: 48 63 ce movslq %esi,%rcx 8: 48 89 d8 mov %rbx,%rax b: 48 09 c8 or %rcx,%rax e: 48 c1 e8 20 shr $0x20,%rax 12: 4c 8b 64 24 10 mov 0x10(%rsp),%r12 17: 74 0d je 0x26 19: 48 89 d8 mov %rbx,%rax 1c: 48 99 cqto 1e: 48 f7 f9 idiv %rcx 21: 49 89 d5 mov %rdx,%r13 24: eb 09 jmp 0x2f 26: 89 d8 mov %ebx,%eax 28: 31 d2 xor %edx,%edx * 2a: f7 f6 div %esi <-- trapping instruction 2c: 41 89 d5 mov %edx,%r13d 2f: 31 ff xor %edi,%edi 31: 4c 89 ee mov %r13,%rsi 34: e8 1f da 39 fb call 0xfb39da58 39: 4d 85 ed test %r13,%r13 3c: 0f .byte 0xf 3d: 85 .byte 0x85 3e: 90 nop 3f: 04 .byte 0x4